Revert "Remove some unused fbs files"

This reverts commit 891036d89a.

third_party/flatbuffers/grpc/README.md

@@ -0,0 +1,42 @@
+GRPC implementation and test
+============================
+
+NOTE: files in `src/` are shared with the GRPC project, and maintained there
+(any changes should be submitted to GRPC instead). These files are copied
+from GRPC, and work with both the Protobuf and FlatBuffers code generator.
+
+`tests/` contains a GRPC specific test, you need to have built and installed
+the GRPC libraries for this to compile. This test will build using the
+`FLATBUFFERS_BUILD_GRPCTEST` option to the main FlatBuffers CMake project.
+
+## Building Flatbuffers with gRPC
+
+### Linux
+
+1. Download, build and install gRPC. See [instructions](https://github.com/grpc/grpc/tree/master/src/cpp).
+    * Lets say your gRPC clone is at `/your/path/to/grpc_repo`.
+    * Install gRPC in a custom directory by running `make install prefix=/your/path/to/grpc_repo/install`.
+2. `export GRPC_INSTALL_PATH=/your/path/to/grpc_repo/install`
+3. `export PROTOBUF_DOWNLOAD_PATH=/your/path/to/grpc_repo/third_party/protobuf`
+4. `mkdir build ; cd build`
+5. `cmake -DFLATBUFFERS_BUILD_GRPCTEST=ON -DGRPC_INSTALL_PATH=${GRPC_INSTALL_PATH} -DPROTOBUF_DOWNLOAD_PATH=${PROTOBUF_DOWNLOAD_PATH} ..`
+6. `make`
+
+For Bazel users:
+
+```shell
+$bazel test src/compiler/...
+```
+
+## Running FlatBuffer gRPC tests
+
+### Linux
+
+1. `export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${GRPC_INSTALL_PATH}/lib`
+2. `make test ARGS=-V`
+
+For Bazel users:
+
+```shell
+$bazel test tests/...
+```

third_party/flatbuffers/grpc/boringssl.patch

@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1645a264a..12f8ca999 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -635,6 +635,8 @@ add_library(
+   src/ssl/tls_record.cc
+ )
+ 
++target_link_libraries(ssl crypto)
++
+ add_executable(
+   bssl
+ 

third_party/flatbuffers/grpc/build_grpc.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+grpc_1_39_0_githash=58602e20a3f3e48f24a4114c757099b25b947f7b
+
+function build_grpc () {
+  git clone https://github.com/grpc/grpc.git google/grpc
+  cd google/grpc
+  git checkout ${grpc_1_39_0_githash}
+  git submodule update --init
+  # Apply boringssl build patch
+  cd third_party/boringssl-with-bazel
+  git apply ../../../../grpc/boringssl.patch
+  cd ../..
+  mkdir ../grpc_build
+  cd ../grpc_build
+  cmake ../grpc -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF -DABSL_ENABLE_INSTALL=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=`pwd`/../grpc/install
+  cmake --build . --target install ${JOBS:+-j$JOBS}
+  cd ../..
+}
+
+GRPC_INSTALL_PATH=`pwd`/google/grpc/install
+PROTOBUF_DOWNLOAD_PATH=`pwd`/google/grpc/third_party/protobuf
+
+build_grpc

third_party/flatbuffers/grpc/build_grpc_with_cxx14.patch

@@ -0,0 +1,10 @@
+diff --git a/bazel/copts.bzl b/bazel/copts.bzl
+index 10be944f25..879518b92f 100644
+--- a/bazel/copts.bzl
++++ b/bazel/copts.bzl
+@@ -59,4 +59,4 @@ GRPC_LLVM_WARNING_FLAGS = [
+ GRPC_DEFAULT_COPTS = select({
+     "//:use_strict_warning": GRPC_LLVM_WARNING_FLAGS + ["-DUSE_STRICT_WARNING=1"],
+     "//conditions:default": [],
+-})
++}) + ["-std=c++14"]

third_party/flatbuffers/grpc/examples/README.md

@@ -0,0 +1,35 @@
+## Languages known issues
+
+### Python
+
+- Assert the type required in your server/client since python is able to receive `Bytes array` or `utf8 strings`.
+
+```python
+def SayHello(self, request, context):
+    # request might be a byte array or a utf8 string
+
+    r = HelloRequest.HelloRequest().GetRootAs(request, 0)
+    reply = "Unknown"
+    if r.Name():
+        reply = r.Name()
+    # Issues might happen if type checking isnt present.
+    # thus encoding it as a `reply.decode('UTF-8')`
+    return build_reply("welcome " + reply.decode('UTF-8'))
+
+```
+
+This can be prevented by making sure all the requests coming to/from python are `Bytes array`
+
+```python
+def say_hello(stub, builder):
+    hello_request = bytes(builder.Output())
+    reply = stub.SayHello(hello_request)
+    r = HelloReply.HelloReply.GetRootAs(reply)
+    print(r.Message())
+```
+
+### Go
+
+- Always requires the `content-type` of the payload to be set to `application/grpc+flatbuffers`
+
+example: `.SayHello(ctx, b, grpc.CallContentSubtype("flatbuffers"))`

third_party/flatbuffers/grpc/examples/go/format.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+#
+# Copyright 2021 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+
+format_greeter() {
+  cd greeter
+
+  # Format client
+  cd client
+  gofmt -w .
+  cd ..
+
+  # Format server
+  cd server
+  gofmt -w .
+  cd ..
+
+  cd ..
+}
+
+format_greeter

third_party/flatbuffers/grpc/examples/go/greeter/.gitignore

@@ -0,0 +1,2 @@
+**/server
+**/client

third_party/flatbuffers/grpc/examples/go/greeter/README.md

@@ -0,0 +1,25 @@
+# Go Greeter example
+
+## Project Structure
+
+    .
+    ├── server                   # Server module
+    ├── client                   # Client module
+    ├── models                   # Flatbuffers models & main grpc code.
+    └── README.md
+
+## How to run Server:
+
+- `cd server`
+
+- `go clean`
+
+- `go run main.go`
+
+## How to run Client:
+
+- `cd client`
+
+- `go clean`
+
+- `go run main.go --name NAME`

third_party/flatbuffers/grpc/examples/go/greeter/client/go.mod

@@ -0,0 +1,11 @@
+module github.com/google/flatbuffers/grpc/examples/go/greeter/client
+
+go 1.15
+
+replace github.com/google/flatbuffers/grpc/examples/go/greeter/models v0.0.0 => ../models
+
+require (
+	github.com/google/flatbuffers v2.0.8+incompatible
+	github.com/google/flatbuffers/grpc/examples/go/greeter/models v0.0.0
+	google.golang.org/grpc v1.56.3
+)

third_party/flatbuffers/grpc/examples/go/greeter/client/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"time"
+
+	flatbuffers "github.com/google/flatbuffers/go"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	models "github.com/google/flatbuffers/grpc/examples/go/greeter/models"
+)
+
+var (
+	addr = "3000"
+	name = flag.String("name", "Flatbuffers", "name to be sent to server :D")
+)
+
+func printSayHello(client models.GreeterClient, name string) {
+	log.Printf("Name to be sent (%s)", name)
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(name)
+	models.HelloRequestStart(b)
+	models.HelloRequestAddName(b, i)
+	b.Finish(models.HelloRequestEnd(b))
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	request, err := client.SayHello(ctx, b, grpc.CallContentSubtype("flatbuffers"))
+	if err != nil {
+		log.Fatalf("%v.SayHello(_) = _, %v: ", client, err)
+	}
+	log.Printf("server said %q", request.Message())
+}
+
+func printSayManyHello(client models.GreeterClient, name string) {
+	log.Printf("Name to be sent (%s)", name)
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(name)
+	models.HelloRequestStart(b)
+	models.HelloRequestAddName(b, i)
+	b.Finish(models.HelloRequestEnd(b))
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	stream, err := client.SayManyHellos(ctx, b, grpc.CallContentSubtype("flatbuffers"))
+	if err != nil {
+		log.Fatalf("%v.SayManyHellos(_) = _, %v", client, err)
+	}
+	for {
+		request, err := stream.Recv()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			log.Fatalf("%v.SayManyHellos(_) = _, %v", client, err)
+		}
+		log.Printf("server said %q", request.Message())
+	}
+}
+
+func main() {
+	flag.Parse()
+	conn, err := grpc.Dial(fmt.Sprintf("localhost:%d", 3000),
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithDefaultCallOptions(grpc.ForceCodec(flatbuffers.FlatbuffersCodec{})))
+	if err != nil {
+		log.Fatalf("fail to dial: %v", err)
+	}
+	defer conn.Close()
+	client := models.NewGreeterClient(conn)
+	printSayHello(client, *name)
+	printSayManyHello(client, *name)
+}

third_party/flatbuffers/grpc/examples/go/greeter/models/Greeter_grpc.go

@@ -0,0 +1,158 @@
+//Generated by gRPC Go plugin
+//If you make any local changes, they will be lost
+//source: greeter
+
+package models
+
+import (
+	context "context"
+	flatbuffers "github.com/google/flatbuffers/go"
+	grpc "google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// Client API for Greeter service
+type GreeterClient interface {
+	SayHello(ctx context.Context, in *flatbuffers.Builder,
+		opts ...grpc.CallOption) (*HelloReply, error)
+	SayManyHellos(ctx context.Context, in *flatbuffers.Builder,
+		opts ...grpc.CallOption) (Greeter_SayManyHellosClient, error)
+}
+
+type greeterClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewGreeterClient(cc grpc.ClientConnInterface) GreeterClient {
+	return &greeterClient{cc}
+}
+
+func (c *greeterClient) SayHello(ctx context.Context, in *flatbuffers.Builder,
+	opts ...grpc.CallOption) (*HelloReply, error) {
+	out := new(HelloReply)
+	err := c.cc.Invoke(ctx, "/models.Greeter/SayHello", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *greeterClient) SayManyHellos(ctx context.Context, in *flatbuffers.Builder,
+	opts ...grpc.CallOption) (Greeter_SayManyHellosClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_Greeter_serviceDesc.Streams[0], "/models.Greeter/SayManyHellos", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &greeterSayManyHellosClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type Greeter_SayManyHellosClient interface {
+	Recv() (*HelloReply, error)
+	grpc.ClientStream
+}
+
+type greeterSayManyHellosClient struct {
+	grpc.ClientStream
+}
+
+func (x *greeterSayManyHellosClient) Recv() (*HelloReply, error) {
+	m := new(HelloReply)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Server API for Greeter service
+type GreeterServer interface {
+	SayHello(context.Context, *HelloRequest) (*flatbuffers.Builder, error)
+	SayManyHellos(*HelloRequest, Greeter_SayManyHellosServer) error
+	mustEmbedUnimplementedGreeterServer()
+}
+
+type UnimplementedGreeterServer struct {
+}
+
+func (UnimplementedGreeterServer) SayHello(context.Context, *HelloRequest) (*flatbuffers.Builder, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SayHello not implemented")
+}
+
+func (UnimplementedGreeterServer) SayManyHellos(*HelloRequest, Greeter_SayManyHellosServer) error {
+	return status.Errorf(codes.Unimplemented, "method SayManyHellos not implemented")
+}
+
+func (UnimplementedGreeterServer) mustEmbedUnimplementedGreeterServer() {}
+
+type UnsafeGreeterServer interface {
+	mustEmbedUnimplementedGreeterServer()
+}
+
+func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
+	s.RegisterService(&_Greeter_serviceDesc, srv)
+}
+
+func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context,
+	dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(HelloRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(GreeterServer).SayHello(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/models.Greeter/SayHello",
+	}
+
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(GreeterServer).SayHello(ctx, req.(*HelloRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+func _Greeter_SayManyHellos_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(HelloRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(GreeterServer).SayManyHellos(m, &greeterSayManyHellosServer{stream})
+}
+
+type Greeter_SayManyHellosServer interface {
+	Send(*flatbuffers.Builder) error
+	grpc.ServerStream
+}
+
+type greeterSayManyHellosServer struct {
+	grpc.ServerStream
+}
+
+func (x *greeterSayManyHellosServer) Send(m *flatbuffers.Builder) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+var _Greeter_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "models.Greeter",
+	HandlerType: (*GreeterServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SayHello",
+			Handler:    _Greeter_SayHello_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "SayManyHellos",
+			Handler:       _Greeter_SayManyHellos_Handler,
+			ServerStreams: true,
+		},
+	},
+}

third_party/flatbuffers/grpc/examples/go/greeter/models/HelloReply.go

@@ -0,0 +1,60 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package models
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+)
+
+type HelloReply struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsHelloReply(buf []byte, offset flatbuffers.UOffsetT) *HelloReply {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &HelloReply{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func FinishHelloReplyBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.Finish(offset)
+}
+
+func GetSizePrefixedRootAsHelloReply(buf []byte, offset flatbuffers.UOffsetT) *HelloReply {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &HelloReply{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func FinishSizePrefixedHelloReplyBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.FinishSizePrefixed(offset)
+}
+
+func (rcv *HelloReply) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *HelloReply) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *HelloReply) Message() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func HelloReplyStart(builder *flatbuffers.Builder) {
+	builder.StartObject(1)
+}
+func HelloReplyAddMessage(builder *flatbuffers.Builder, message flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(message), 0)
+}
+func HelloReplyEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}

third_party/flatbuffers/grpc/examples/go/greeter/models/HelloRequest.go

@@ -0,0 +1,60 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package models
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+)
+
+type HelloRequest struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsHelloRequest(buf []byte, offset flatbuffers.UOffsetT) *HelloRequest {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &HelloRequest{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func FinishHelloRequestBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.Finish(offset)
+}
+
+func GetSizePrefixedRootAsHelloRequest(buf []byte, offset flatbuffers.UOffsetT) *HelloRequest {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &HelloRequest{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func FinishSizePrefixedHelloRequestBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.FinishSizePrefixed(offset)
+}
+
+func (rcv *HelloRequest) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *HelloRequest) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *HelloRequest) Name() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func HelloRequestStart(builder *flatbuffers.Builder) {
+	builder.StartObject(1)
+}
+func HelloRequestAddName(builder *flatbuffers.Builder, name flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(name), 0)
+}
+func HelloRequestEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}

third_party/flatbuffers/grpc/examples/go/greeter/models/go.mod

@@ -0,0 +1,8 @@
+module github.com/google/flatbuffers/grpc/examples/go/greeter/models
+
+go 1.15
+
+require (
+	github.com/google/flatbuffers v2.0.8+incompatible
+	google.golang.org/grpc v1.56.3
+)

third_party/flatbuffers/grpc/examples/go/greeter/server/go.mod

@@ -0,0 +1,11 @@
+module github.com/google/flatbuffers/grpc/examples/go/greeter/server
+
+go 1.15
+
+replace github.com/google/flatbuffers/grpc/examples/go/greeter/models v0.0.0 => ../models
+
+require (
+	github.com/google/flatbuffers v2.0.8+incompatible
+	github.com/google/flatbuffers/grpc/examples/go/greeter/models v0.0.0
+	google.golang.org/grpc v1.56.3
+)

third_party/flatbuffers/grpc/examples/go/greeter/server/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+
+	flatbuffers "github.com/google/flatbuffers/go"
+	models "github.com/google/flatbuffers/grpc/examples/go/greeter/models"
+	"google.golang.org/grpc"
+)
+
+var (
+	greetings = [...]string{"Hi", "Hallo", "Ciao"}
+)
+
+type greeterServer struct {
+	models.UnimplementedGreeterServer
+}
+
+func (s *greeterServer) SayHello(ctx context.Context, request *models.HelloRequest) (*flatbuffers.Builder, error) {
+	v := request.Name()
+	var m string
+	if v == nil {
+		m = "Unknown"
+	} else {
+		m = string(v)
+	}
+	b := flatbuffers.NewBuilder(0)
+	idx := b.CreateString("welcome " + m)
+	models.HelloReplyStart(b)
+	models.HelloReplyAddMessage(b, idx)
+	b.Finish(models.HelloReplyEnd(b))
+	return b, nil
+}
+
+func (s *greeterServer) SayManyHellos(request *models.HelloRequest, stream models.Greeter_SayManyHellosServer) error {
+	v := request.Name()
+	var m string
+	if v == nil {
+		m = "Unknown"
+	} else {
+		m = string(v)
+	}
+	b := flatbuffers.NewBuilder(0)
+
+	for _, greeting := range greetings {
+		idx := b.CreateString(greeting + " " + m)
+		models.HelloReplyStart(b)
+		models.HelloReplyAddMessage(b, idx)
+		b.Finish(models.HelloReplyEnd(b))
+		if err := stream.Send(b); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func newServer() *greeterServer {
+	s := &greeterServer{}
+	return s
+}
+
+func main() {
+	lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", 3000))
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	codec := &flatbuffers.FlatbuffersCodec{}
+	grpcServer := grpc.NewServer(grpc.ForceServerCodec(codec))
+	models.RegisterGreeterServer(grpcServer, newServer())
+	if err := grpcServer.Serve(lis); err != nil {
+		fmt.Print(err)
+		panic(err)
+	}
+}

third_party/flatbuffers/grpc/examples/greeter.fbs

@@ -0,0 +1,14 @@
+namespace models;
+
+table HelloReply {
+  message:string;
+}
+
+table HelloRequest {
+  name:string;
+}
+
+rpc_service Greeter {
+  SayHello(HelloRequest):HelloReply;
+  SayManyHellos(HelloRequest):HelloReply (streaming: "server");
+}

third_party/flatbuffers/grpc/examples/python/greeter/README.md

@@ -0,0 +1,12 @@
+# Python Greeter example
+
+## Prerequisite
+
+- You need to have grpc python installed on your device `pip install grpcio`
+## How to run Server:
+
+- `python server.py ${PORT}`
+
+## How to run Client:
+
+- `python client.py ${PORT} ${NAME}`

third_party/flatbuffers/grpc/examples/python/greeter/client.py

@@ -0,0 +1,40 @@
+import sys		
+import argparse
+import grpc
+
+sys.path.insert(0, '../../../../../flatbuffers/python')
+
+import flatbuffers
+from models import HelloReply, HelloRequest, greeter_grpc_fb
+
+parser = argparse.ArgumentParser()
+parser.add_argument("port", help="server port to connect to", default=3000)
+parser.add_argument("name", help="name to be sent to server", default="flatbuffers")
+
+def say_hello(stub, hello_request):
+    reply = stub.SayHello(hello_request)
+    r = HelloReply.HelloReply.GetRootAs(reply)
+    print(r.Message())
+
+def say_many_hellos(stub, hello_request):
+    greetings = stub.SayManyHellos(hello_request)
+    for greeting in greetings:
+        r = HelloReply.HelloReply.GetRootAs(greeting)
+        print(r.Message())
+
+def main():
+    args = parser.parse_args()
+
+    with grpc.insecure_channel('localhost:' + args.port) as channel:
+        builder = flatbuffers.Builder()		
+        ind = builder.CreateString(args.name)
+        HelloRequest.HelloRequestStart(builder)
+        HelloRequest.HelloRequestAddName(builder, ind)
+        root = HelloRequest.HelloRequestEnd(builder)
+        builder.Finish(root)
+        output = bytes(builder.Output())
+        stub = greeter_grpc_fb.GreeterStub(channel)
+        say_hello(stub, output)
+        say_many_hellos(stub, output)
+
+main()

third_party/flatbuffers/grpc/examples/python/greeter/models/HelloReply.py

@@ -0,0 +1,50 @@
+# automatically generated by the FlatBuffers compiler, do not modify
+
+# namespace: models
+
+import flatbuffers
+from flatbuffers.compat import import_numpy
+np = import_numpy()
+
+class HelloReply(object):
+    __slots__ = ['_tab']
+
+    @classmethod
+    def GetRootAs(cls, buf, offset=0):
+        n = flatbuffers.encode.Get(flatbuffers.packer.uoffset, buf, offset)
+        x = HelloReply()
+        x.Init(buf, n + offset)
+        return x
+
+    @classmethod
+    def GetRootAsHelloReply(cls, buf, offset=0):
+        """This method is deprecated. Please switch to GetRootAs."""
+        return cls.GetRootAs(buf, offset)
+    # HelloReply
+    def Init(self, buf, pos):
+        self._tab = flatbuffers.table.Table(buf, pos)
+
+    # HelloReply
+    def Message(self):
+        o = flatbuffers.number_types.UOffsetTFlags.py_type(self._tab.Offset(4))
+        if o != 0:
+            return self._tab.String(o + self._tab.Pos)
+        return None
+
+def HelloReplyStart(builder):
+    builder.StartObject(1)
+
+def Start(builder):
+    HelloReplyStart(builder)
+
+def HelloReplyAddMessage(builder, message):
+    builder.PrependUOffsetTRelativeSlot(0, flatbuffers.number_types.UOffsetTFlags.py_type(message), 0)
+
+def AddMessage(builder, message):
+    HelloReplyAddMessage(builder, message)
+
+def HelloReplyEnd(builder):
+    return builder.EndObject()
+
+def End(builder):
+    return HelloReplyEnd(builder)

third_party/flatbuffers/grpc/examples/python/greeter/models/HelloRequest.py

@@ -0,0 +1,50 @@
+# automatically generated by the FlatBuffers compiler, do not modify
+
+# namespace: models
+
+import flatbuffers
+from flatbuffers.compat import import_numpy
+np = import_numpy()
+
+class HelloRequest(object):
+    __slots__ = ['_tab']
+
+    @classmethod
+    def GetRootAs(cls, buf, offset=0):
+        n = flatbuffers.encode.Get(flatbuffers.packer.uoffset, buf, offset)
+        x = HelloRequest()
+        x.Init(buf, n + offset)
+        return x
+
+    @classmethod
+    def GetRootAsHelloRequest(cls, buf, offset=0):
+        """This method is deprecated. Please switch to GetRootAs."""
+        return cls.GetRootAs(buf, offset)
+    # HelloRequest
+    def Init(self, buf, pos):
+        self._tab = flatbuffers.table.Table(buf, pos)
+
+    # HelloRequest
+    def Name(self):
+        o = flatbuffers.number_types.UOffsetTFlags.py_type(self._tab.Offset(4))
+        if o != 0:
+            return self._tab.String(o + self._tab.Pos)
+        return None
+
+def HelloRequestStart(builder):
+    builder.StartObject(1)
+
+def Start(builder):
+    HelloRequestStart(builder)
+
+def HelloRequestAddName(builder, name):
+    builder.PrependUOffsetTRelativeSlot(0, flatbuffers.number_types.UOffsetTFlags.py_type(name), 0)
+
+def AddName(builder, name):
+    HelloRequestAddName(builder, name)
+
+def HelloRequestEnd(builder):
+    return builder.EndObject()
+
+def End(builder):
+    return HelloRequestEnd(builder)

third_party/flatbuffers/grpc/examples/python/greeter/models/greeter_grpc_fb.py

@@ -0,0 +1,52 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+
+import grpc
+
+class GreeterStub(object):
+  """ Interface exported by the server. """  
+  
+  def __init__(self, channel):
+    """ Constructor. 
+    
+    Args: 
+    channel: A grpc.Channel. 
+    """
+    
+    self.SayHello = channel.unary_unary(
+      "/models.Greeter/SayHello"
+      )
+    
+    self.SayManyHellos = channel.unary_stream(
+      "/models.Greeter/SayManyHellos"
+      )
+    
+
+class GreeterServicer(object):
+  """ Interface exported by the server. """  
+  
+  def SayHello(self, request, context):
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+  
+  
+  def SayManyHellos(self, request, context):
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+  
+  
+
+def add_GreeterServicer_to_server(servicer, server):
+  rpc_method_handlers = {
+    'SayHello': grpc.unary_unary_rpc_method_handler(
+      servicer.SayHello
+    ),
+    'SayManyHellos': grpc.unary_stream_rpc_method_handler(
+      servicer.SayManyHellos
+    ),
+  }
+  generic_handler = grpc.method_handlers_generic_handler(
+    'models.Greeter', rpc_method_handlers)
+  server.add_generic_rpc_handlers((generic_handler,))
+

third_party/flatbuffers/grpc/examples/python/greeter/server.py

@@ -0,0 +1,57 @@
+from concurrent import futures
+import sys		
+import argparse
+import grpc
+
+sys.path.insert(0, '../../../../../flatbuffers/python')
+
+import flatbuffers
+from models import HelloReply, HelloRequest, greeter_grpc_fb
+
+parser = argparse.ArgumentParser()
+parser.add_argument("port", help="server on port", default=3000)
+
+def build_reply(message):
+    builder = flatbuffers.Builder()		
+    ind = builder.CreateString(message)
+    HelloReply.HelloReplyStart(builder)
+    HelloReply.HelloReplyAddMessage(builder, ind)
+    root = HelloReply.HelloReplyEnd(builder)
+    builder.Finish(root)
+    return bytes(builder.Output())
+
+class GreeterServicer(greeter_grpc_fb.GreeterServicer):
+
+    def __init__(self):
+        self.greetings = ["Hi", "Hallo", "Ciao"]
+
+    def SayHello(self, request, context):
+        r = HelloRequest.HelloRequest().GetRootAs(request, 0)
+        reply = "Unknown"
+        if r.Name():
+            reply = r.Name()
+        return build_reply("welcome " + reply.decode('UTF-8'))
+
+    def SayManyHellos(self, request, context):
+        r = HelloRequest.HelloRequest().GetRootAs(request, 0)
+        reply = "Unknown"
+        if r.Name():
+            reply = r.Name()
+
+        for greeting in self.greetings:
+            print(type(reply))
+            yield build_reply(greeting + " " + reply.decode('UTF-8'))
+        
+
+def serve():
+    args = parser.parse_args()
+    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
+    greeter_grpc_fb.add_GreeterServicer_to_server(
+        GreeterServicer(), server
+    )
+    server.add_insecure_port('[::]:' + args.port)
+    server.start()
+    server.wait_for_termination()
+
+if __name__ == '__main__':
+    serve()

third_party/flatbuffers/grpc/examples/swift/Greeter/Package.swift

@@ -0,0 +1,58 @@
+// swift-tools-version:5.1
+/*
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import PackageDescription
+
+let package = Package(
+  name: "Greeter",
+  platforms: [
+    .iOS(.v11),
+    .macOS(.v10_14),
+  ],
+  dependencies: [
+    .package(path: "../../../../swift"),
+    .package(url: "https://github.com/grpc/grpc-swift.git", from: "1.0.0"),
+  ],
+  targets: [
+    // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+    // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+    .target(
+      name: "Model",
+      dependencies: [
+        "GRPC",
+        "FlatBuffers",
+      ],
+      path: "Sources/Model"),
+
+    // Client for the Greeter example
+    .target(
+      name: "Client",
+      dependencies: [
+        "GRPC",
+        "Model",
+      ],
+      path: "Sources/client"),
+
+    // Server for the Greeter example
+    .target(
+      name: "Server",
+      dependencies: [
+        "GRPC",
+        "Model",
+      ],
+      path: "Sources/server"),
+  ])

third_party/flatbuffers/grpc/examples/swift/Greeter/README.md

@@ -0,0 +1,7 @@
+# FlatBuffers.GRPC.Swift
+
+The following is Swift example on how GRPC would be with Swift Flatbuffers, you can simply run the following commands:
+
+`swift run Server`
+
+`swift run Client {port} {name}`

third_party/flatbuffers/grpc/examples/swift/Greeter/Sources/Model/greeter.grpc.swift

@@ -0,0 +1,145 @@
+// Generated GRPC code for FlatBuffers swift!
+/// The following code is generated by the Flatbuffers library which might not be in sync with grpc-swift
+/// in case of an issue please open github issue, though it would be maintained
+
+// swiftlint:disable all
+// swiftformat:disable all
+
+import Foundation
+import GRPC
+import NIO
+import NIOHTTP1
+import FlatBuffers
+
+public protocol GRPCFlatBufPayload: GRPCPayload, FlatBufferGRPCMessage {}
+public extension GRPCFlatBufPayload {
+  init(serializedByteBuffer: inout NIO.ByteBuffer) throws {
+    self.init(byteBuffer: FlatBuffers.ByteBuffer(contiguousBytes: serializedByteBuffer.readableBytesView, count: serializedByteBuffer.readableBytes))
+  }
+  func serialize(into buffer: inout NIO.ByteBuffer) throws {
+    let buf = UnsafeRawBufferPointer(start: self.rawPointer, count: Int(self.size))
+    buffer.writeBytes(buf)
+  }
+}
+extension Message: GRPCFlatBufPayload {}
+
+/// Usage: instantiate models_GreeterServiceClient, then call methods of this protocol to make API calls.
+public protocol models_GreeterClientProtocol: GRPCClient {
+
+  var serviceName: String { get }
+
+  var interceptors: models_GreeterClientInterceptorFactoryProtocol? { get }
+
+  func SayHello(
+    _ request: Message<models_HelloRequest>
+    , callOptions: CallOptions?
+  ) -> UnaryCall<Message<models_HelloRequest>, Message<models_HelloReply>>
+
+  func SayManyHellos(
+    _ request: Message<models_HelloRequest>
+    , callOptions: CallOptions?,
+    handler: @escaping (Message<models_HelloReply>) -> Void
+  ) -> ServerStreamingCall<Message<models_HelloRequest>, Message<models_HelloReply>>
+
+}
+
+extension models_GreeterClientProtocol {
+
+  public var serviceName: String { "models.Greeter" }
+
+  public func SayHello(
+    _ request: Message<models_HelloRequest>
+    , callOptions: CallOptions? = nil
+  ) -> UnaryCall<Message<models_HelloRequest>, Message<models_HelloReply>> {
+    return self.makeUnaryCall(
+      path: "/models.Greeter/SayHello",
+      request: request,
+      callOptions: callOptions ?? self.defaultCallOptions,
+      interceptors: self.interceptors?.makeSayHelloInterceptors() ?? []
+    )
+  }
+
+  public func SayManyHellos(
+    _ request: Message<models_HelloRequest>
+    , callOptions: CallOptions? = nil,
+    handler: @escaping (Message<models_HelloReply>) -> Void
+  ) -> ServerStreamingCall<Message<models_HelloRequest>, Message<models_HelloReply>> {
+    return self.makeServerStreamingCall(
+      path: "/models.Greeter/SayManyHellos",
+      request: request,
+      callOptions: callOptions ?? self.defaultCallOptions,
+      interceptors: self.interceptors?.makeSayManyHellosInterceptors() ?? [],
+      handler: handler
+    )
+  }
+}
+
+public protocol models_GreeterClientInterceptorFactoryProtocol {
+  /// - Returns: Interceptors to use when invoking 'SayHello'.
+  func makeSayHelloInterceptors() -> [ClientInterceptor<Message<models_HelloRequest>, Message<models_HelloReply>>]
+
+  /// - Returns: Interceptors to use when invoking 'SayManyHellos'.
+  func makeSayManyHellosInterceptors() -> [ClientInterceptor<Message<models_HelloRequest>, Message<models_HelloReply>>]
+
+}
+
+public final class models_GreeterServiceClient: models_GreeterClientProtocol {
+  public let channel: GRPCChannel
+  public var defaultCallOptions: CallOptions
+  public var interceptors: models_GreeterClientInterceptorFactoryProtocol?
+
+  public init(
+    channel: GRPCChannel,
+    defaultCallOptions: CallOptions = CallOptions(),
+    interceptors: models_GreeterClientInterceptorFactoryProtocol? = nil
+  ) {
+    self.channel = channel
+    self.defaultCallOptions = defaultCallOptions
+    self.interceptors = interceptors
+  }
+}
+
+public protocol models_GreeterProvider: CallHandlerProvider {
+  var interceptors: models_GreeterServerInterceptorFactoryProtocol? { get }
+  func SayHello(request: Message<models_HelloRequest>, context: StatusOnlyCallContext) -> EventLoopFuture<Message<models_HelloReply>>
+  func SayManyHellos(request: Message<models_HelloRequest>, context: StreamingResponseCallContext<Message<models_HelloReply>>) -> EventLoopFuture<GRPCStatus>
+}
+
+public extension models_GreeterProvider {
+
+  var serviceName: Substring { return "models.Greeter" }
+
+  func handle(method name: Substring, context: CallHandlerContext) -> GRPCServerHandlerProtocol? {
+    switch name {
+    case "SayHello":
+    return UnaryServerHandler(
+      context: context,
+      requestDeserializer: GRPCPayloadDeserializer<Message<models_HelloRequest>>(),
+      responseSerializer: GRPCPayloadSerializer<Message<models_HelloReply>>(),
+      interceptors: self.interceptors?.makeSayHelloInterceptors() ?? [],
+      userFunction: self.SayHello(request:context:))
+
+    case "SayManyHellos":
+    return ServerStreamingServerHandler(
+      context: context,
+      requestDeserializer: GRPCPayloadDeserializer<Message<models_HelloRequest>>(),
+      responseSerializer: GRPCPayloadSerializer<Message<models_HelloReply>>(),
+      interceptors: self.interceptors?.makeSayManyHellosInterceptors() ?? [],
+      userFunction: self.SayManyHellos(request:context:))
+
+    default: return nil;
+    }
+  }
+
+}
+
+public protocol models_GreeterServerInterceptorFactoryProtocol {
+  /// - Returns: Interceptors to use when handling 'SayHello'.
+  ///   Defaults to calling `self.makeInterceptors()`.
+  func makeSayHelloInterceptors() -> [ServerInterceptor<Message<models_HelloRequest>, Message<models_HelloReply>>]
+
+  /// - Returns: Interceptors to use when handling 'SayManyHellos'.
+  ///   Defaults to calling `self.makeInterceptors()`.
+  func makeSayManyHellosInterceptors() -> [ServerInterceptor<Message<models_HelloRequest>, Message<models_HelloReply>>]
+
+}

third_party/flatbuffers/grpc/examples/swift/Greeter/Sources/Model/greeter_generated.swift

@@ -0,0 +1,100 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+// swiftlint:disable all
+// swiftformat:disable all
+
+import FlatBuffers
+
+public struct models_HelloReply: FlatBufferObject, Verifiable {
+
+  static func validateVersion() { FlatBuffersVersion_24_3_25() }
+  public var __buffer: ByteBuffer! { return _accessor.bb }
+  private var _accessor: Table
+
+  private init(_ t: Table) { _accessor = t }
+  public init(_ bb: ByteBuffer, o: Int32) { _accessor = Table(bb: bb, position: o) }
+
+  private enum VTOFFSET: VOffset {
+    case message = 4
+    var v: Int32 { Int32(self.rawValue) }
+    var p: VOffset { self.rawValue }
+  }
+
+  public var message: String? { let o = _accessor.offset(VTOFFSET.message.v); return o == 0 ? nil : _accessor.string(at: o) }
+  public var messageSegmentArray: [UInt8]? { return _accessor.getVector(at: VTOFFSET.message.v) }
+  public static func startHelloReply(_ fbb: inout FlatBufferBuilder) -> UOffset { fbb.startTable(with: 1) }
+  public static func add(message: Offset, _ fbb: inout FlatBufferBuilder) { fbb.add(offset: message, at: VTOFFSET.message.p) }
+  public static func endHelloReply(_ fbb: inout FlatBufferBuilder, start: UOffset) -> Offset { let end = Offset(offset: fbb.endTable(at: start)); return end }
+  public static func createHelloReply(
+    _ fbb: inout FlatBufferBuilder,
+    messageOffset message: Offset = Offset()
+  ) -> Offset {
+    let __start = models_HelloReply.startHelloReply(&fbb)
+    models_HelloReply.add(message: message, &fbb)
+    return models_HelloReply.endHelloReply(&fbb, start: __start)
+  }
+
+  public static func verify<T>(_ verifier: inout Verifier, at position: Int, of type: T.Type) throws where T: Verifiable {
+    var _v = try verifier.visitTable(at: position)
+    try _v.visit(field: VTOFFSET.message.p, fieldName: "message", required: false, type: ForwardOffset<String>.self)
+    _v.finish()
+  }
+}
+
+extension models_HelloReply: Encodable {
+
+  enum CodingKeys: String, CodingKey {
+    case message = "message"
+  }
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    try container.encodeIfPresent(message, forKey: .message)
+  }
+}
+
+public struct models_HelloRequest: FlatBufferObject, Verifiable {
+
+  static func validateVersion() { FlatBuffersVersion_24_3_25() }
+  public var __buffer: ByteBuffer! { return _accessor.bb }
+  private var _accessor: Table
+
+  private init(_ t: Table) { _accessor = t }
+  public init(_ bb: ByteBuffer, o: Int32) { _accessor = Table(bb: bb, position: o) }
+
+  private enum VTOFFSET: VOffset {
+    case name = 4
+    var v: Int32 { Int32(self.rawValue) }
+    var p: VOffset { self.rawValue }
+  }
+
+  public var name: String? { let o = _accessor.offset(VTOFFSET.name.v); return o == 0 ? nil : _accessor.string(at: o) }
+  public var nameSegmentArray: [UInt8]? { return _accessor.getVector(at: VTOFFSET.name.v) }
+  public static func startHelloRequest(_ fbb: inout FlatBufferBuilder) -> UOffset { fbb.startTable(with: 1) }
+  public static func add(name: Offset, _ fbb: inout FlatBufferBuilder) { fbb.add(offset: name, at: VTOFFSET.name.p) }
+  public static func endHelloRequest(_ fbb: inout FlatBufferBuilder, start: UOffset) -> Offset { let end = Offset(offset: fbb.endTable(at: start)); return end }
+  public static func createHelloRequest(
+    _ fbb: inout FlatBufferBuilder,
+    nameOffset name: Offset = Offset()
+  ) -> Offset {
+    let __start = models_HelloRequest.startHelloRequest(&fbb)
+    models_HelloRequest.add(name: name, &fbb)
+    return models_HelloRequest.endHelloRequest(&fbb, start: __start)
+  }
+
+  public static func verify<T>(_ verifier: inout Verifier, at position: Int, of type: T.Type) throws where T: Verifiable {
+    var _v = try verifier.visitTable(at: position)
+    try _v.visit(field: VTOFFSET.name.p, fieldName: "name", required: false, type: ForwardOffset<String>.self)
+    _v.finish()
+  }
+}
+
+extension models_HelloRequest: Encodable {
+
+  enum CodingKeys: String, CodingKey {
+    case name = "name"
+  }
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    try container.encodeIfPresent(name, forKey: .name)
+  }
+}
+

third_party/flatbuffers/grpc/examples/swift/Greeter/Sources/client/main.swift

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2023 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import FlatBuffers
+import GRPC
+import Logging
+import Model
+import NIO
+
+// Quieten the logs.
+LoggingSystem.bootstrap {
+  var handler = StreamLogHandler.standardOutput(label: $0)
+  handler.logLevel = .critical
+  return handler
+}
+
+func greet(name: String, client greeter: models_GreeterServiceClient) {
+  // Form the request with the name, if one was provided.
+  var builder = FlatBufferBuilder()
+  let nameOff = builder.create(string: name)
+  let root = models_HelloRequest.createHelloRequest(
+    &builder,
+    nameOffset: nameOff)
+  builder.finish(offset: root)
+
+  // Make the RPC call to the server.
+  let sayHello = greeter
+    .SayHello(Message<models_HelloRequest>(builder: &builder))
+
+  // wait() on the response to stop the program from exiting before the response is received.
+  do {
+    let response = try sayHello.response.wait()
+    print("Greeter SayHello received: \(response.object.message ?? "Unknown")")
+  } catch {
+    print("Greeter failed: \(error)")
+  }
+
+  let surname = builder.create(string: name)
+  let manyRoot = models_HelloRequest.createHelloRequest(
+    &builder,
+    nameOffset: surname)
+  builder.finish(offset: manyRoot)
+
+  let call = greeter.SayManyHellos(Message(builder: &builder)) { message in
+    print(
+      "Greeter SayManyHellos received: \(message.object.message  ?? "Unknown")")
+  }
+
+  let status = try! call.status.recover { _ in .processingError }.wait()
+  if status.code != .ok {
+    print("RPC failed: \(status)")
+  }
+}
+
+func main(args: [String]) {
+  // arg0 (dropped) is the program name. We expect arg1 to be the port, and arg2 (optional) to be
+  // the name sent in the request.
+  let arg1 = args.dropFirst(1).first
+  let arg2 = args.dropFirst(2).first
+
+  switch (arg1.flatMap(Int.init), arg2) {
+  case (.none, _):
+    print("Usage: PORT [NAME]")
+    exit(1)
+
+  case let (.some(port), name):
+    // Setup an `EventLoopGroup` for the connection to run on.
+    //
+    // See: https://github.com/apple/swift-nio#eventloops-and-eventloopgroups
+    let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+
+    // Make sure the group is shutdown when we're done with it.
+    defer {
+      try! group.syncShutdownGracefully()
+    }
+
+    // Configure the channel, we're not using TLS so the connection is `insecure`.
+    let channel = ClientConnection.insecure(group: group)
+      .connect(host: "localhost", port: port)
+
+    // Close the connection when we're done with it.
+    defer {
+      try! channel.close().wait()
+    }
+
+    // Provide the connection to the generated client.
+    let greeter = models_GreeterServiceClient(channel: channel)
+
+    // Do the greeting.
+    greet(name: name ?? "FlatBuffers!", client: greeter)
+  }
+}
+
+main(args: CommandLine.arguments)

third_party/flatbuffers/grpc/examples/swift/Greeter/Sources/server/main.swift

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2023 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import FlatBuffers
+import GRPC
+import Logging
+import Model
+import NIO
+
+class Greeter: models_GreeterProvider {
+
+  var interceptors: models_GreeterServerInterceptorFactoryProtocol?
+
+  let greetings: [String]
+
+  init() {
+    greetings = ["Hi", "Hallo", "Ciao"]
+  }
+
+  func SayHello(
+    request: Message<models_HelloRequest>,
+    context: StatusOnlyCallContext)
+    -> EventLoopFuture<Message<models_HelloReply>>
+  {
+    let recipient = request.object.name ?? "Stranger"
+
+    var builder = FlatBufferBuilder()
+    let off = builder.create(string: "Hello \(recipient)")
+    let root = models_HelloReply.createHelloReply(&builder, messageOffset: off)
+    builder.finish(offset: root)
+    return context.eventLoop
+      .makeSucceededFuture(Message<models_HelloReply>(builder: &builder))
+  }
+
+  func SayManyHellos(
+    request: Message<models_HelloRequest>,
+    context: StreamingResponseCallContext<Message<models_HelloReply>>)
+    -> EventLoopFuture<GRPCStatus>
+  {
+    for name in greetings {
+      var builder = FlatBufferBuilder()
+      let off = builder
+        .create(string: "\(name) \(request.object.name ?? "Unknown")")
+      let root = models_HelloReply.createHelloReply(
+        &builder,
+        messageOffset: off)
+      builder.finish(offset: root)
+      _ = context.sendResponse(Message<models_HelloReply>(builder: &builder))
+    }
+    return context.eventLoop.makeSucceededFuture(.ok)
+  }
+}
+
+// Quieten the logs.
+LoggingSystem.bootstrap {
+  var handler = StreamLogHandler.standardOutput(label: $0)
+  handler.logLevel = .critical
+  return handler
+}
+
+let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+defer {
+  try! group.syncShutdownGracefully()
+}
+
+// Create some configuration for the server:
+let configuration = Server.Configuration(
+  target: .hostAndPort("localhost", 0),
+  eventLoopGroup: group,
+  serviceProviders: [Greeter()])
+
+// Start the server and print its address once it has started.
+let server = Server.start(configuration: configuration)
+server.map {
+  $0.channel.localAddress
+}.whenSuccess { address in
+  print("server started on port \(address!.port!)")
+}
+
+// Wait on the server's `onClose` future to stop the program from exiting.
+_ = try server.flatMap {
+  $0.onClose
+}.wait()

third_party/flatbuffers/grpc/examples/ts/greeter/README.md

@@ -0,0 +1,13 @@
+# TS Greeter example
+
+The following is an example on how to run the TS grpc server. Make sure that you have `Typescript` installed
+
+you would need to run `npm run build` or simply use `npm install && tsc`
+
+## How to run Server:
+
+- `npm run server`
+
+## How to run Client:
+
+- `npm run client 3000`

third_party/flatbuffers/grpc/examples/ts/greeter/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "flatbuffers-js-grpc",
+  "version": "1.0.0",
+  "author": "mustii@mmk.one",
+  "scripts": {
+    "build": "npm install && tsc",
+    "client": "node dist/client.js",
+    "server": "node dist/server.js"
+  },
+  "dependencies": {
+    "@grpc/grpc-js": "^1.3.2",
+    "flatbuffers": "^2.0.0"
+  }
+}

third_party/flatbuffers/grpc/examples/ts/greeter/src/client.ts

@@ -0,0 +1,34 @@
+import * as grpc from '@grpc/grpc-js';
+import * as flatbuffers from 'flatbuffers';
+import { HelloReply } from './models/hello-reply';
+import { HelloRequest } from './models/hello-request';
+import { GreeterClient } from './greeter_grpc';
+
+async function main(PORT: Number, name: string) {
+    const client = new GreeterClient(`localhost:${PORT}`, grpc.credentials.createInsecure());
+    const builder = new flatbuffers.Builder();
+    const offset = builder.createString(name);
+    const root = HelloRequest.createHelloRequest(builder, offset);
+    builder.finish(root);
+    const buffer = HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(builder.asUint8Array()));
+
+    client.SayHello(buffer, (err, response) => {
+        console.log(response.message());
+    });
+
+    const data = client.SayManyHellos(buffer, null);
+
+    data.on('data', (data) => {
+        console.log(data.message());
+    });
+}
+
+const args = process.argv.slice(2)
+const PORT = Number(args[0]);
+const name: string = args[1] ?? "flatbuffers";
+
+if (PORT) {
+    main(PORT, name);
+} else {
+    throw new Error("Requires a valid port number.")
+}

third_party/flatbuffers/grpc/examples/ts/greeter/src/greeter.ts

@@ -0,0 +1,5 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+export * as models from './models.js';

third_party/flatbuffers/grpc/examples/ts/greeter/src/greeter_generated.ts

@@ -0,0 +1,4 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+export { HelloReply } from './models/hello-reply.js';
+export { HelloRequest } from './models/hello-request.js';

third_party/flatbuffers/grpc/examples/ts/greeter/src/greeter_grpc.d.ts

@@ -0,0 +1,56 @@
+// Generated GRPC code for FlatBuffers TS *** DO NOT EDIT ***
+import * as flatbuffers from 'flatbuffers';
+import { HelloReply as models_HelloReply } from './models/hello-reply';
+import { HelloRequest as models_HelloRequest } from './models/hello-request';
+
+import * as grpc from '@grpc/grpc-js';
+
+interface IGreeterService extends grpc.ServiceDefinition<grpc.UntypedServiceImplementation> {
+  SayHello: IGreeterService_ISayHello;
+  SayManyHellos: IGreeterService_ISayManyHellos;
+}
+interface IGreeterService_ISayHello extends grpc.MethodDefinition<models_HelloRequest, models_HelloReply> {
+  path: string; // /models.Greeter/SayHello
+  requestStream: boolean; // false
+  responseStream: boolean; // false
+  requestSerialize: grpc.serialize<models_HelloRequest>;
+  requestDeserialize: grpc.deserialize<models_HelloRequest>;
+  responseSerialize: grpc.serialize<models_HelloReply>;
+  responseDeserialize: grpc.deserialize<models_HelloReply>;
+}
+
+interface IGreeterService_ISayManyHellos extends grpc.MethodDefinition<models_HelloRequest, models_HelloReply> {
+  path: string; // /models.Greeter/SayManyHellos
+  requestStream: boolean; // false
+  responseStream: boolean; // true
+  requestSerialize: grpc.serialize<models_HelloRequest>;
+  requestDeserialize: grpc.deserialize<models_HelloRequest>;
+  responseSerialize: grpc.serialize<models_HelloReply>;
+  responseDeserialize: grpc.deserialize<models_HelloReply>;
+}
+
+
+export const GreeterService: IGreeterService;
+
+export interface IGreeterServer extends grpc.UntypedServiceImplementation {
+  SayHello: grpc.handleUnaryCall<models_HelloRequest, models_HelloReply>;
+  SayManyHellos: grpc.handleServerStreamingCall<models_HelloRequest, models_HelloReply>;
+}
+
+export interface IGreeterClient {
+  SayHello(request: models_HelloRequest, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  SayHello(request: models_HelloRequest, metadata: grpc.Metadata, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  SayHello(request: models_HelloRequest, metadata: grpc.Metadata, options: Partial<grpc.CallOptions>, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  SayManyHellos(request: models_HelloRequest, metadata: grpc.Metadata): grpc.ClientReadableStream<models_HelloReply>;
+  SayManyHellos(request: models_HelloRequest, options: Partial<grpc.CallOptions>): grpc.ClientReadableStream<models_HelloReply>;
+}
+
+export class GreeterClient extends grpc.Client implements IGreeterClient {
+  constructor(address: string, credentials: grpc.ChannelCredentials, options?: object);
+  public SayHello(request: models_HelloRequest, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  public SayHello(request: models_HelloRequest, metadata: grpc.Metadata, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  public SayHello(request: models_HelloRequest, metadata: grpc.Metadata, options: Partial<grpc.CallOptions>, callback: (error: grpc.ServiceError | null, response: models_HelloReply) => void): grpc.ClientUnaryCall;
+  public SayManyHellos(request: models_HelloRequest, metadata: grpc.Metadata): grpc.ClientReadableStream<models_HelloReply>;
+  public SayManyHellos(request: models_HelloRequest, options: Partial<grpc.CallOptions>): grpc.ClientReadableStream<models_HelloReply>;
+}
+

third_party/flatbuffers/grpc/examples/ts/greeter/src/greeter_grpc.js

@@ -0,0 +1,56 @@
+// Generated GRPC code for FlatBuffers TS *** DO NOT EDIT ***
+import * as flatbuffers from 'flatbuffers';
+import { HelloReply as models_HelloReply } from './models/hello-reply';
+import { HelloRequest as models_HelloRequest } from './models/hello-request';
+
+var grpc = require('@grpc/grpc-js');
+
+function serialize_models_HelloReply(buffer_args) {
+  if (!(buffer_args instanceof models_HelloReply)) {
+    throw new Error('Expected argument of type HelloReply');
+  }
+  return Buffer.from(buffer_args.serialize());
+}
+
+function deserialize_models_HelloReply(buffer) {
+  return models_HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+function serialize_models_HelloRequest(buffer_args) {
+  if (!(buffer_args instanceof models_HelloRequest)) {
+    throw new Error('Expected argument of type HelloRequest');
+  }
+  return Buffer.from(buffer_args.serialize());
+}
+
+function deserialize_models_HelloRequest(buffer) {
+  return models_HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+var GreeterService = exports.GreeterService = {
+  SayHello: {
+    path: '/models.Greeter/SayHello',
+    requestStream: false,
+    responseStream: false,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: models_HelloReply,
+    requestSerialize: serialize_models_HelloRequest,
+    requestDeserialize: deserialize_models_HelloRequest,
+    responseSerialize: serialize_models_HelloReply,
+    responseDeserialize: deserialize_models_HelloReply,
+  },
+  SayManyHellos: {
+    path: '/models.Greeter/SayManyHellos',
+    requestStream: false,
+    responseStream: true,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: models_HelloReply,
+    requestSerialize: serialize_models_HelloRequest,
+    requestDeserialize: deserialize_models_HelloRequest,
+    responseSerialize: serialize_models_HelloReply,
+    responseDeserialize: deserialize_models_HelloReply,
+  },
+};
+exports.GreeterClient = grpc.makeGenericClientConstructor(GreeterService);

third_party/flatbuffers/grpc/examples/ts/greeter/src/models.ts

@@ -0,0 +1,6 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+export { HelloReply } from './models/hello-reply.js';
+export { HelloRequest } from './models/hello-request.js';

third_party/flatbuffers/grpc/examples/ts/greeter/src/models/hello-reply.ts

@@ -0,0 +1,60 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class HelloReply {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):HelloReply {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsHelloReply(bb:flatbuffers.ByteBuffer, obj?:HelloReply):HelloReply {
+  return (obj || new HelloReply()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsHelloReply(bb:flatbuffers.ByteBuffer, obj?:HelloReply):HelloReply {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new HelloReply()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+message():string|null
+message(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+message(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startHelloReply(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addMessage(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageOffset, 0);
+}
+
+static endHelloReply(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createHelloReply(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset):flatbuffers.Offset {
+  HelloReply.startHelloReply(builder);
+  HelloReply.addMessage(builder, messageOffset);
+  return HelloReply.endHelloReply(builder);
+}
+
+serialize():Uint8Array {
+  return this.bb!.bytes();
+}
+
+static deserialize(buffer: Uint8Array):HelloReply {
+  return HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(buffer))
+}
+}

third_party/flatbuffers/grpc/examples/ts/greeter/src/models/hello-request.ts

@@ -0,0 +1,60 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class HelloRequest {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):HelloRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsHelloRequest(bb:flatbuffers.ByteBuffer, obj?:HelloRequest):HelloRequest {
+  return (obj || new HelloRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsHelloRequest(bb:flatbuffers.ByteBuffer, obj?:HelloRequest):HelloRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new HelloRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+name():string|null
+name(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+name(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startHelloRequest(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addName(builder:flatbuffers.Builder, nameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, nameOffset, 0);
+}
+
+static endHelloRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createHelloRequest(builder:flatbuffers.Builder, nameOffset:flatbuffers.Offset):flatbuffers.Offset {
+  HelloRequest.startHelloRequest(builder);
+  HelloRequest.addName(builder, nameOffset);
+  return HelloRequest.endHelloRequest(builder);
+}
+
+serialize():Uint8Array {
+  return this.bb!.bytes();
+}
+
+static deserialize(buffer: Uint8Array):HelloRequest {
+  return HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(buffer))
+}
+}

third_party/flatbuffers/grpc/examples/ts/greeter/src/server.ts

@@ -0,0 +1,49 @@
+import * as grpc from '@grpc/grpc-js';
+import * as flatbuffers from 'flatbuffers';
+import { HelloReply } from './models/hello-reply';
+import { HelloRequest } from './models/hello-request';
+import { IGreeterServer, GreeterService } from './greeter_grpc';
+
+const greeter: IGreeterServer = {
+    SayHello(call: grpc.ServerUnaryCall<HelloRequest, HelloReply>, callback: grpc.sendUnaryData<HelloReply>): void {
+        console.log(`SayHello ${call.request.name()}`);
+        const builder = new flatbuffers.Builder();
+        const offset = builder.createString(`welcome ${call.request.name()}`);
+        const root = HelloReply.createHelloReply(builder, offset);
+        builder.finish(root);
+        callback(null, HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(builder.asUint8Array())));
+    },
+    async SayManyHellos(call: grpc.ServerWritableStream<HelloRequest, HelloReply>): Promise<void> {
+        const name = call.request.name();
+        console.log(`${call.request.name()} saying hi in different langagues`);
+        ['Hi', 'Hallo', 'Ciao'].forEach(element => {
+            const builder = new flatbuffers.Builder();
+            const offset = builder.createString(`${element} ${name}`);
+            const root = HelloReply.createHelloReply(builder, offset);
+            builder.finish(root);
+            call.write(HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(builder.asUint8Array())))
+        });
+        call.end();
+    }
+}
+
+function serve(): void {
+    const PORT = 3000;
+    const server = new grpc.Server();
+    server.addService(GreeterService, greeter);
+    console.log(`Listening on ${PORT}`);
+    server.bindAsync(
+        `localhost:${PORT}`,
+        grpc.ServerCredentials.createInsecure(),
+        (err: Error | null, port: number) => {
+          if (err) {
+            console.error(`Server error: ${err.message}`);
+          } else {
+            console.log(`Server bound on port: ${port}`);
+            server.start();
+          }
+        }
+      );
+}
+
+serve();

third_party/flatbuffers/grpc/examples/ts/greeter/tsconfig.json

@@ -0,0 +1,17 @@
+{
+    "compilerOptions": {
+      "target": "es5",
+      "module": "commonjs",
+      "outDir": "./dist",
+      "allowJs": true,
+      "sourceMap": true,
+      "strict": true,
+      "noImplicitAny": false,
+      "strictNullChecks": false,
+      "esModuleInterop": true,
+      "baseUrl": "./",
+      "typeRoots": ["node_modules/@types"],
+      "skipLibCheck": true, 
+      "forceConsistentCasingInFileNames": true
+    }
+  }

third_party/flatbuffers/grpc/flatbuffers-java-grpc/pom.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.google.flatbuffers</groupId>
+        <artifactId>flatbuffers-parent</artifactId>
+        <version>2.0.3</version>
+    </parent>
+    <artifactId>flatbuffers-java-grpc</artifactId>
+    <name>${project.artifactId}</name>
+    <packaging>bundle</packaging>
+    <description>
+        Utilities supporting generated code for GRPC
+    </description>
+    <developers>
+        <developer>
+            <name>Wouter van Oortmerssen</name>
+        </developer>
+        <developer>
+            <name>Yuri Finkelstein</name>
+            <url>https://github.com/yfinkelstein</url>
+        </developer>
+    </developers>
+    <properties>
+        <gRPC.version>1.36.0</gRPC.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.flatbuffers</groupId>
+            <artifactId>flatbuffers-java</artifactId>
+            <version>${project.parent.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-core</artifactId>
+            <version>${gRPC.version}</version>
+        </dependency>
+  </dependencies>
+</project>
+

third_party/flatbuffers/grpc/flatbuffers-java-grpc/src/main/java/com/google/flatbuffers/grpc/FlatbuffersUtils.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.flatbuffers.grpc;
+
+import com.google.flatbuffers.Table;
+import io.grpc.Drainable;
+import io.grpc.KnownLength;
+import io.grpc.MethodDescriptor;
+
+import javax.annotation.Nullable;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+public class FlatbuffersUtils {
+    abstract public static class FBExtactor  <T extends Table> {
+        T extract (InputStream stream) throws IOException {
+            if (stream instanceof KnownLength) {
+                int size = stream.available();
+                ByteBuffer buffer = ByteBuffer.allocate(size);
+                stream.read(buffer.array());
+                return extract(buffer);
+            } else
+                throw new RuntimeException("The class " + stream.getClass().getCanonicalName() + " does not extend from KnownLength ");
+        }
+
+        public abstract T extract(ByteBuffer buffer);
+
+    }
+
+    static class FBInputStream extends InputStream implements Drainable, KnownLength {
+        private final ByteBuffer buffer;
+        private final int size;
+        @Nullable private ByteArrayInputStream inputStream;
+
+        FBInputStream(ByteBuffer buffer) {
+            this.buffer = buffer;
+            this.size = buffer.remaining();
+        }
+
+        private void makeStreamIfNotAlready() {
+            if (inputStream == null)
+                inputStream = new ByteArrayInputStream(buffer.array(), buffer.position(), size);
+        }
+
+        @Override
+        public int drainTo(OutputStream target) throws IOException {
+            target.write(buffer.array(), buffer.position(), size);
+            return size;
+        }
+
+        @Override
+        public int read() throws IOException {
+            makeStreamIfNotAlready();
+            return inputStream.read();
+        }
+
+        @Override
+        public int read(byte[] b, int off, int len) throws IOException {
+            makeStreamIfNotAlready();
+            if (inputStream == null) {
+                if (len >= size) {
+                    System.arraycopy(buffer.array(), buffer.position(), b, off, size);
+                    return size;
+                } else {
+                    makeStreamIfNotAlready();
+                    return inputStream.read(b, off, len);
+                }
+            } else
+                return inputStream.read(b, off, len);
+        }
+
+        @Override
+        public int available() throws IOException {
+            return inputStream == null ? size : inputStream.available();
+        }
+
+    }
+
+    public static <T extends Table> MethodDescriptor.Marshaller<T> marshaller(final Class<T> clazz, final FBExtactor<T> extractor) {
+        return new MethodDescriptor.ReflectableMarshaller<T>() {
+            @Override
+            public Class<T> getMessageClass() {
+                return clazz;
+            }
+
+            @Override
+            public InputStream stream(T value) {
+                return new FBInputStream (value.getByteBuffer());
+            }
+
+            @Override
+            public T parse(InputStream stream) {
+                try {
+                    return extractor.extract(stream);
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        };
+    }
+}

third_party/flatbuffers/grpc/pom.xml

@@ -0,0 +1,219 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.google.flatbuffers</groupId>
+    <artifactId>flatbuffers-parent</artifactId>
+    <packaging>pom</packaging>
+    <version>2.0.3</version>
+    <name>flatbuffers-parent</name>
+    <description>parent pom for flatbuffers java artifacts</description>
+    <properties>
+        <scm.url>https://github.com/google/flatbuffers</scm.url>
+        <scm.connection>scm:git:${scm.url}.git</scm.connection>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <licenses>
+        <license>
+            <name>The Apache Software License, Version 2.0</name>
+            <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <issueManagement>
+        <system>GitHub</system>
+        <url>https://github.com/google/flatbuffers/issues</url>
+    </issueManagement>
+
+    <developers>
+        <developer>
+            <name>Wouter van Oortmerssen</name>
+        </developer>
+    </developers>
+
+    <url>${scm.url}</url>
+
+    <scm>
+        <connection>${scm.connection}</connection>
+        <developerConnection>${scm.connection}</developerConnection>
+        <url>${scm.url}</url>
+        <tag>HEAD</tag>
+    </scm>
+
+    <distributionManagement>
+        <snapshotRepository>
+            <id>ossrh</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </snapshotRepository>
+    </distributionManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+    <build>
+        <extensions>
+            <extension>
+                <!--
+                    os-maven-plugin is a Maven extension/plugin that generates various useful platform-dependent
+                    project properties normalized from ${os.detected.name} and ${os.detected.arch}.
+                -->
+                <groupId>kr.motd.maven</groupId>
+                <artifactId>os-maven-plugin</artifactId>
+                <version>1.5.0.Final</version>
+            </extension>
+        </extensions>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.6.1</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.0.2</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-source-plugin</artifactId>
+                    <version>3.0.1</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-surefire-plugin</artifactId>
+                    <version>2.19.1</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-javadoc-plugin</artifactId>
+                    <version>2.10.4</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.codehaus.mojo</groupId>
+                    <artifactId>build-helper-maven-plugin</artifactId>
+                    <version>1.12</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-dependency-plugin</artifactId>
+                    <version>2.8</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-deploy-plugin</artifactId>
+                    <version>2.7</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-gpg-plugin</artifactId>
+                    <version>1.5</version>
+                </plugin>
+                <plugin>
+                    <artifactId>maven-release-plugin</artifactId>
+                    <version>2.5.3</version>
+                </plugin>
+
+                <plugin>
+                    <groupId>org.codehaus.mojo</groupId>
+                    <artifactId>exec-maven-plugin</artifactId>
+                    <version>1.5.0</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.6</source>
+                    <target>1.6</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <includes>
+                        <include>**/*Test.java</include>
+                    </includes>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-source-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-javadocs</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <version>3.0.1</version>
+                <extensions>true</extensions>
+            </plugin>
+            <plugin>
+                <groupId>org.sonatype.plugins</groupId>
+                <artifactId>nexus-staging-maven-plugin</artifactId>
+                <version>1.6.7</version>
+                <extensions>true</extensions>
+                <configuration>
+                    <serverId>ossrh</serverId>
+                    <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+                    <autoReleaseAfterClose>true</autoReleaseAfterClose>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-gpg-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>sign-artifacts</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>sign</goal>
+                        </goals>
+                        <configuration>
+                            <gpgArguments>
+                                <arg>--pinentry-mode</arg>
+                                <arg>loopback</arg>
+                            </gpgArguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>maven-release-plugin</artifactId>
+                <configuration>
+                    <autoVersionSubmodules>true</autoVersionSubmodules>
+                    <useReleaseProfile>false</useReleaseProfile>
+                    <releaseProfiles>release</releaseProfiles>
+                    <goals>deploy</goals>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <modules>
+<!-- consider the benefits of publishing all maven artifacts in this project
+
+        <module>flatbuffers-compiler</module>
+        <module>flatbuffers-java</module>
+
+-->
+        <module>flatbuffers-java-grpc</module>
+    </modules>
+
+</project>

third_party/flatbuffers/grpc/samples/greeter/Makefile

@@ -0,0 +1,14 @@
+CXXFLAGS ?= -I../../../include
+LDFLAGS ?=
+
+.PHONY: all
+all: server client
+
+greeter_generated: greeter.fbs
+	flatc --grpc --cpp $<
+
+server: greeter_generated server.cpp greeter.grpc.fb.cc greeter.grpc.fb.h
+	g++ -std=c++11 -O2 $(CXXFLAGS) $(LDFLAGS) -lgpr -lgrpc -lgrpc++ server.cpp greeter.grpc.fb.cc -o $@
+
+client: greeter_generated client.cpp greeter.grpc.fb.cc greeter.grpc.fb.h
+	g++ -std=c++11 -O2 $(CXXFLAGS) $(LDFLAGS) -lgpr -lgrpc -lgrpc++ client.cpp greeter.grpc.fb.cc -o $@

third_party/flatbuffers/grpc/samples/greeter/client.cpp

@@ -0,0 +1,85 @@
+#include "greeter.grpc.fb.h"
+#include "greeter_generated.h"
+
+#include <grpcpp/grpcpp.h>
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+class GreeterClient {
+ public:
+  GreeterClient(std::shared_ptr<grpc::Channel> channel)
+    : stub_(Greeter::NewStub(channel)) {}
+
+  std::string SayHello(const std::string &name) {
+    flatbuffers::grpc::MessageBuilder mb;
+    auto name_offset = mb.CreateString(name);
+    auto request_offset = CreateHelloRequest(mb, name_offset);
+    mb.Finish(request_offset);
+    auto request_msg = mb.ReleaseMessage<HelloRequest>();
+
+    flatbuffers::grpc::Message<HelloReply> response_msg;
+
+    grpc::ClientContext context;
+
+    auto status = stub_->SayHello(&context, request_msg, &response_msg);
+    if (status.ok()) {
+      const HelloReply *response = response_msg.GetRoot();
+      return response->message()->str();
+    } else {
+      std::cerr << status.error_code() << ": " << status.error_message()
+                << std::endl;
+      return "RPC failed";
+    }
+  }
+
+  void SayManyHellos(const std::string &name, int num_greetings,
+                     std::function<void(const std::string &)> callback) {
+    flatbuffers::grpc::MessageBuilder mb;
+    auto name_offset = mb.CreateString(name);
+    auto request_offset =
+        CreateManyHellosRequest(mb, name_offset, num_greetings);
+    mb.Finish(request_offset);
+    auto request_msg = mb.ReleaseMessage<ManyHellosRequest>();
+
+    flatbuffers::grpc::Message<HelloReply> response_msg;
+
+    grpc::ClientContext context;
+
+    auto stream = stub_->SayManyHellos(&context, request_msg);
+    while (stream->Read(&response_msg)) {
+      const HelloReply *response = response_msg.GetRoot();
+      callback(response->message()->str());
+    }
+    auto status = stream->Finish();
+    if (!status.ok()) {
+      std::cerr << status.error_code() << ": " << status.error_message()
+                << std::endl;
+      callback("RPC failed");
+    }
+  }
+
+ private:
+  std::unique_ptr<Greeter::Stub> stub_;
+};
+
+int main(int argc, char **argv) {
+  std::string server_address("localhost:50051");
+
+  auto channel =
+      grpc::CreateChannel(server_address, grpc::InsecureChannelCredentials());
+  GreeterClient greeter(channel);
+
+  std::string name("world");
+
+  std::string message = greeter.SayHello(name);
+  std::cerr << "Greeter received: " << message << std::endl;
+
+  int num_greetings = 10;
+  greeter.SayManyHellos(name, num_greetings, [](const std::string &message) {
+    std::cerr << "Greeter received: " << message << std::endl;
+  });
+
+  return 0;
+}

third_party/flatbuffers/grpc/samples/greeter/greeter.fbs

@@ -0,0 +1,17 @@
+table HelloReply {
+  message:string;
+}
+
+table HelloRequest {
+  name:string;
+}
+
+table ManyHellosRequest {
+  name:string;
+  num_greetings:int;
+}
+
+rpc_service Greeter {
+  SayHello(HelloRequest):HelloReply;
+  SayManyHellos(ManyHellosRequest):HelloReply (streaming: "server");
+}

third_party/flatbuffers/grpc/samples/greeter/server.cpp

@@ -0,0 +1,81 @@
+#include "greeter.grpc.fb.h"
+#include "greeter_generated.h"
+
+#include <grpcpp/grpcpp.h>
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+class GreeterServiceImpl final : public Greeter::Service {
+  virtual grpc::Status SayHello(
+      grpc::ServerContext *context,
+      const flatbuffers::grpc::Message<HelloRequest> *request_msg,
+      flatbuffers::grpc::Message<HelloReply> *response_msg) override {
+    flatbuffers::grpc::MessageBuilder mb_;
+
+    // We call GetRoot to "parse" the message. Verification is already
+    // performed by default. See the notes below for more details.
+    const HelloRequest *request = request_msg->GetRoot();
+
+    // Fields are retrieved as usual with FlatBuffers
+    const std::string &name = request->name()->str();
+
+    // `flatbuffers::grpc::MessageBuilder` is a `FlatBufferBuilder` with a
+    // special allocator for efficient gRPC buffer transfer, but otherwise
+    // usage is the same as usual.
+    auto msg_offset = mb_.CreateString("Hello, " + name);
+    auto hello_offset = CreateHelloReply(mb_, msg_offset);
+    mb_.Finish(hello_offset);
+
+    // The `ReleaseMessage<T>()` function detaches the message from the
+    // builder, so we can transfer the resopnse to gRPC while simultaneously
+    // detaching that memory buffer from the builer.
+    *response_msg = mb_.ReleaseMessage<HelloReply>();
+    assert(response_msg->Verify());
+
+    // Return an OK status.
+    return grpc::Status::OK;
+  }
+
+  virtual grpc::Status SayManyHellos(
+      grpc::ServerContext *context,
+      const flatbuffers::grpc::Message<ManyHellosRequest> *request_msg,
+      grpc::ServerWriter<flatbuffers::grpc::Message<HelloReply>> *writer)
+      override {
+    // The streaming usage below is simply a combination of standard gRPC
+    // streaming with the FlatBuffers usage shown above.
+    const ManyHellosRequest *request = request_msg->GetRoot();
+    const std::string &name = request->name()->str();
+    int num_greetings = request->num_greetings();
+
+    for (int i = 0; i < num_greetings; i++) {
+      auto msg_offset = mb_.CreateString("Many hellos, " + name);
+      auto hello_offset = CreateHelloReply(mb_, msg_offset);
+      mb_.Finish(hello_offset);
+      writer->Write(mb_.ReleaseMessage<HelloReply>());
+    }
+
+    return grpc::Status::OK;
+  }
+
+  flatbuffers::grpc::MessageBuilder mb_;
+};
+
+void RunServer() {
+  std::string server_address("0.0.0.0:50051");
+  GreeterServiceImpl service;
+
+  grpc::ServerBuilder builder;
+  builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
+  builder.RegisterService(&service);
+  std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
+  std::cerr << "Server listening on " << server_address << std::endl;
+
+  server->Wait();
+}
+
+int main(int argc, const char *argv[]) {
+  RunServer();
+  return 0;
+}

third_party/flatbuffers/grpc/src/compiler/BUILD.bazel

@@ -0,0 +1,131 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "distribution",
+    srcs = [
+        "BUILD.bazel",
+    ] + glob([
+        "*.cc",
+        "*.h",
+    ]),
+)
+
+filegroup(
+    name = "common_headers",
+    srcs = [
+        "schema_interface.h",
+    ],
+)
+
+cc_library(
+    name = "cpp_generator",
+    srcs = [
+        "cpp_generator.cc",
+    ],
+    hdrs = [
+        "cpp_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        "//:flatbuffers",
+    ],
+)
+
+cc_library(
+    name = "go_generator",
+    srcs = [
+        "go_generator.cc",
+    ],
+    hdrs = [
+        "go_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        "//:flatbuffers",
+    ],
+)
+
+cc_library(
+    name = "java_generator",
+    srcs = [
+        "java_generator.cc",
+    ],
+    hdrs = [
+        "java_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        "//:flatbuffers",
+    ],
+)
+
+cc_library(
+    name = "python_generator",
+    hdrs = [
+        "python_generator.h",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        ":python_generator_private",
+    ],
+)
+
+cc_library(
+    name = "python_generator_private",
+    srcs = [
+        "python_generator.cc",
+    ],
+    hdrs = [
+        "python_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//:flatbuffers",
+    ],
+)
+
+cc_library(
+    name = "swift_generator",
+    srcs = [
+        "swift_generator.cc",
+    ],
+    hdrs = [
+        "swift_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        "//:flatbuffers",
+    ],
+)
+
+cc_library(
+    name = "ts_generator",
+    srcs = [
+        "ts_generator.cc",
+    ],
+    hdrs = [
+        "ts_generator.h",
+        ":common_headers",
+    ],
+    include_prefix = "src/compiler",
+    strip_include_prefix = "/grpc/src/compiler",
+    deps = [
+        "//:flatbuffers",
+    ],
+)

third_party/flatbuffers/grpc/src/compiler/cpp_generator.h

@@ -0,0 +1,106 @@
+#ifndef GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H
+#define GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H
+
+// cpp_generator.h/.cc do not directly depend on GRPC/ProtoBuf, such that they
+// can be used to generate code for other serialization systems, such as
+// FlatBuffers.
+
+#include <memory>
+#include <vector>
+
+#include "src/compiler/schema_interface.h"
+
+#ifndef GRPC_CUSTOM_STRING
+#  include <string>
+#  define GRPC_CUSTOM_STRING std::string
+#endif
+
+namespace grpc {
+
+typedef GRPC_CUSTOM_STRING string;
+
+}  // namespace grpc
+
+namespace grpc_cpp_generator {
+
+// Contains all the parameters that are parsed from the command line.
+struct Parameters {
+  // Puts the service into a namespace
+  grpc::string services_namespace;
+  // Use system includes (<>) or local includes ("")
+  bool use_system_headers;
+  // Prefix to any grpc include
+  grpc::string grpc_search_path;
+  // Generate GMOCK code to facilitate unit testing.
+  bool generate_mock_code;
+  // By default, use "_generated.h"
+  std::string message_header_extension;
+};
+
+// Return the prologue of the generated header file.
+grpc::string GetHeaderPrologue(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the includes needed for generated header file.
+grpc::string GetHeaderIncludes(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the includes needed for generated source file.
+grpc::string GetSourceIncludes(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the epilogue of the generated header file.
+grpc::string GetHeaderEpilogue(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the prologue of the generated source file.
+grpc::string GetSourcePrologue(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the services for generated header file.
+grpc::string GetHeaderServices(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the services for generated source file.
+grpc::string GetSourceServices(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the epilogue of the generated source file.
+grpc::string GetSourceEpilogue(grpc_generator::File *file,
+                               const Parameters &params);
+
+// Return the prologue of the generated mock file.
+grpc::string GetMockPrologue(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the includes needed for generated mock file.
+grpc::string GetMockIncludes(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the services for generated mock file.
+grpc::string GetMockServices(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the epilogue of generated mock file.
+grpc::string GetMockEpilogue(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the prologue of the generated mock file.
+grpc::string GetMockPrologue(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the includes needed for generated mock file.
+grpc::string GetMockIncludes(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the services for generated mock file.
+grpc::string GetMockServices(grpc_generator::File *file,
+                             const Parameters &params);
+
+// Return the epilogue of generated mock file.
+grpc::string GetMockEpilogue(grpc_generator::File *file,
+                             const Parameters &params);
+
+}  // namespace grpc_cpp_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H

third_party/flatbuffers/grpc/src/compiler/go_generator.cc

@@ -0,0 +1,507 @@
+#include "src/compiler/go_generator.h"
+
+#include <cctype>
+#include <map>
+#include <sstream>
+
+template<class T> grpc::string as_string(T x) {
+  std::ostringstream out;
+  out << x;
+  return out.str();
+}
+
+inline bool ClientOnlyStreaming(const grpc_generator::Method *method) {
+  return method->ClientStreaming() && !method->ServerStreaming();
+}
+
+inline bool ServerOnlyStreaming(const grpc_generator::Method *method) {
+  return !method->ClientStreaming() && method->ServerStreaming();
+}
+
+namespace grpc_go_generator {
+namespace {
+
+// Returns string with first letter to lowerCase
+static grpc::string unexportName(grpc::string s) {
+  if (s.empty()) return s;
+  s[0] = static_cast<char>(std::tolower(s[0]));
+  return s;
+}
+
+// Returns string with first letter to uppercase
+static grpc::string exportName(grpc::string s) {
+  if (s.empty()) return s;
+  s[0] = static_cast<char>(std::toupper(s[0]));
+  return s;
+}
+
+static void GenerateError(grpc_generator::Printer *printer,
+                   std::map<grpc::string, grpc::string> vars,
+                   const bool multiple_return = true) {
+  printer->Print(vars, "if $Error_Check$ {\n");
+  printer->Indent();
+  vars["Return"] = multiple_return ? "nil, err" : "err";
+  printer->Print(vars, "return $Return$\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+// Generates imports for the service
+static void GenerateImports(grpc_generator::File *file,
+                     grpc_generator::Printer *printer,
+                     std::map<grpc::string, grpc::string> vars) {
+  vars["filename"] = file->filename();
+  printer->Print("//Generated by gRPC Go plugin\n");
+  printer->Print("//If you make any local changes, they will be lost\n");
+  printer->Print(vars, "//source: $filename$\n\n");
+  printer->Print(vars, "package $Package$\n\n");
+  printer->Print("import (\n");
+  printer->Indent();
+  printer->Print(vars, "$context$ \"context\"\n");
+  printer->Print("flatbuffers \"github.com/google/flatbuffers/go\"\n");
+  printer->Print(vars, "$grpc$ \"google.golang.org/grpc\"\n");
+  printer->Print("\"google.golang.org/grpc/codes\"\n");
+  printer->Print("\"google.golang.org/grpc/status\"\n");
+  printer->Outdent();
+  printer->Print(")\n\n");
+}
+
+// Generates Server method signature source
+static void GenerateServerMethodSignature(const grpc_generator::Method *method,
+                                   grpc_generator::Printer *printer,
+                                   std::map<grpc::string, grpc::string> vars) {
+  vars["Method"] = exportName(method->name());
+  vars["Request"] = method->get_input_type_name();
+  vars["Response"] = (vars["CustomMethodIO"] == "")
+                         ? method->get_output_type_name()
+                         : vars["CustomMethodIO"];
+  if (method->NoStreaming()) {
+    printer->Print(
+        vars,
+        "$Method$($context$.Context, *$Request$) (*$Response$, error)$Ending$");
+  } else if (ServerOnlyStreaming(method)) {
+    printer->Print(
+        vars, "$Method$(*$Request$, $Service$_$Method$Server) error$Ending$");
+  } else {
+    printer->Print(vars, "$Method$($Service$_$Method$Server) error$Ending$");
+  }
+}
+
+static void GenerateServerMethod(const grpc_generator::Method *method,
+                          grpc_generator::Printer *printer,
+                          std::map<grpc::string, grpc::string> vars) {
+  vars["Method"] = exportName(method->name());
+  vars["Request"] = method->get_input_type_name();
+  vars["Response"] = (vars["CustomMethodIO"] == "")
+                         ? method->get_output_type_name()
+                         : vars["CustomMethodIO"];
+  vars["FullMethodName"] =
+      "/" + vars["ServicePrefix"] + vars["Service"] + "/" + vars["Method"];
+  vars["Handler"] = "_" + vars["Service"] + "_" + vars["Method"] + "_Handler";
+  if (method->NoStreaming()) {
+    printer->Print(
+        vars,
+        "func $Handler$(srv interface{}, ctx $context$.Context,\n\tdec "
+        "func(interface{}) error, interceptor $grpc$.UnaryServerInterceptor) "
+        "(interface{}, error) {\n");
+    printer->Indent();
+    printer->Print(vars, "in := new($Request$)\n");
+    vars["Error_Check"] = "err := dec(in); err != nil";
+    GenerateError(printer, vars);
+    printer->Print("if interceptor == nil {\n");
+    printer->Indent();
+    printer->Print(vars, "return srv.($Service$Server).$Method$(ctx, in)\n");
+    printer->Outdent();
+    printer->Print("}\n");
+    printer->Print(vars, "info := &$grpc$.UnaryServerInfo{\n");
+    printer->Indent();
+    printer->Print("Server:     srv,\n");
+    printer->Print(vars, "FullMethod: \"$FullMethodName$\",\n");
+    printer->Outdent();
+    printer->Print("}\n");
+    printer->Outdent();
+    printer->Print("\n");
+    printer->Indent();
+    printer->Print(vars,
+                   "handler := func(ctx $context$.Context, req interface{}) "
+                   "(interface{}, error) {\n");
+    printer->Indent();
+    printer->Print(
+        vars, "return srv.($Service$Server).$Method$(ctx, req.(*$Request$))\n");
+    printer->Outdent();
+    printer->Print("}\n");
+    printer->Print("return interceptor(ctx, in, info, handler)\n");
+    printer->Outdent();
+    printer->Print("}\n");
+    return;
+  }
+  vars["StreamType"] = vars["ServiceUnexported"] + vars["Method"] + "Server";
+  printer->Print(
+      vars,
+      "func $Handler$(srv interface{}, stream $grpc$.ServerStream) error {\n");
+  printer->Indent();
+  if (ServerOnlyStreaming(method)) {
+    printer->Print(vars, "m := new($Request$)\n");
+    vars["Error_Check"] = "err := stream.RecvMsg(m); err != nil";
+    GenerateError(printer, vars, false);
+    printer->Print(
+        vars,
+        "return srv.($Service$Server).$Method$(m, &$StreamType${stream})\n");
+  } else {
+    printer->Print(
+        vars, "return srv.($Service$Server).$Method$(&$StreamType${stream})\n");
+  }
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  bool genSend = method->BidiStreaming() || ServerOnlyStreaming(method);
+  bool genRecv = method->BidiStreaming() || ClientOnlyStreaming(method);
+  bool genSendAndClose = ClientOnlyStreaming(method);
+
+  printer->Print(vars, "type $Service$_$Method$Server interface {\n");
+  printer->Indent();
+  if (genSend) { printer->Print(vars, "Send(*$Response$) error\n"); }
+  if (genRecv) { printer->Print(vars, "Recv() (*$Request$, error)\n"); }
+  if (genSendAndClose) {
+    printer->Print(vars, "SendAndClose(*$Response$) error\n");
+  }
+  printer->Print(vars, "$grpc$.ServerStream\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  printer->Print(vars, "type $StreamType$ struct {\n");
+  printer->Indent();
+  printer->Print(vars, "$grpc$.ServerStream\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  if (genSend) {
+    printer->Print(vars,
+                   "func (x *$StreamType$) Send(m *$Response$) error {\n");
+    printer->Indent();
+    printer->Print("return x.ServerStream.SendMsg(m)\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+  if (genRecv) {
+    printer->Print(vars,
+                   "func (x *$StreamType$) Recv() (*$Request$, error) {\n");
+    printer->Indent();
+    printer->Print(vars, "m := new($Request$)\n");
+    vars["Error_Check"] = "err := x.ServerStream.RecvMsg(m); err != nil";
+    GenerateError(printer, vars);
+    printer->Print("return m, nil\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+  if (genSendAndClose) {
+    printer->Print(
+        vars, "func (x *$StreamType$) SendAndClose(m *$Response$) error {\n");
+    printer->Indent();
+    printer->Print("return x.ServerStream.SendMsg(m)\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+}
+
+// Generates Client method signature source
+static void GenerateClientMethodSignature(const grpc_generator::Method *method,
+                                   grpc_generator::Printer *printer,
+                                   std::map<grpc::string, grpc::string> vars) {
+  vars["Method"] = exportName(method->name());
+  vars["Request"] =
+      ", in *" + ((vars["CustomMethodIO"] == "") ? method->get_input_type_name()
+                                                 : vars["CustomMethodIO"]);
+  if (ClientOnlyStreaming(method) || method->BidiStreaming()) {
+    vars["Request"] = "";
+  }
+  vars["Response"] = "*" + method->get_output_type_name();
+  if (ClientOnlyStreaming(method) || method->BidiStreaming() ||
+      ServerOnlyStreaming(method)) {
+    vars["Response"] = vars["Service"] + "_" + vars["Method"] + "Client";
+  }
+  printer->Print(vars,
+                 "$Method$(ctx $context$.Context$Request$,\n\topts "
+                 "...$grpc$.CallOption) ($Response$, error)$Ending$");
+}
+
+// Generates Client method source
+static void GenerateClientMethod(const grpc_generator::Method *method,
+                          grpc_generator::Printer *printer,
+                          std::map<grpc::string, grpc::string> vars) {
+  printer->Print(vars, "func (c *$ServiceUnexported$Client) ");
+  vars["Ending"] = " {\n";
+  GenerateClientMethodSignature(method, printer, vars);
+  printer->Indent();
+  vars["Method"] = exportName(method->name());
+  vars["Request"] = (vars["CustomMethodIO"] == "")
+                        ? method->get_input_type_name()
+                        : vars["CustomMethodIO"];
+  vars["Response"] = method->get_output_type_name();
+  vars["FullMethodName"] =
+      "/" + vars["ServicePrefix"] + vars["Service"] + "/" + vars["Method"];
+  if (method->NoStreaming()) {
+    printer->Print(vars, "out := new($Response$)\n");
+    printer->Print(
+        vars,
+        "err := c.cc.Invoke(ctx, \"$FullMethodName$\", in, out, opts...)\n");
+    vars["Error_Check"] = "err != nil";
+    GenerateError(printer, vars);
+    printer->Print("return out, nil\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+    return;
+  }
+  vars["StreamType"] = vars["ServiceUnexported"] + vars["Method"] + "Client";
+  printer->Print(vars,
+                 "stream, err := c.cc.NewStream(ctx, &$MethodDesc$, "
+                 "\"$FullMethodName$\", opts...)\n");
+  vars["Error_Check"] = "err != nil";
+  GenerateError(printer, vars);
+
+  printer->Print(vars, "x := &$StreamType${stream}\n");
+  if (ServerOnlyStreaming(method)) {
+    vars["Error_Check"] = "err := x.ClientStream.SendMsg(in); err != nil";
+    GenerateError(printer, vars);
+    vars["Error_Check"] = "err := x.ClientStream.CloseSend(); err != nil";
+    GenerateError(printer, vars);
+  }
+  printer->Print("return x, nil\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  bool genSend = method->BidiStreaming() || ClientOnlyStreaming(method);
+  bool genRecv = method->BidiStreaming() || ServerOnlyStreaming(method);
+  bool genCloseAndRecv = ClientOnlyStreaming(method);
+
+  // Stream interface
+  printer->Print(vars, "type $Service$_$Method$Client interface {\n");
+  printer->Indent();
+  if (genSend) { printer->Print(vars, "Send(*$Request$) error\n"); }
+  if (genRecv) { printer->Print(vars, "Recv() (*$Response$, error)\n"); }
+  if (genCloseAndRecv) {
+    printer->Print(vars, "CloseAndRecv() (*$Response$, error)\n");
+  }
+  printer->Print(vars, "$grpc$.ClientStream\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  // Stream Client
+  printer->Print(vars, "type $StreamType$ struct {\n");
+  printer->Indent();
+  printer->Print(vars, "$grpc$.ClientStream\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  if (genSend) {
+    printer->Print(vars, "func (x *$StreamType$) Send(m *$Request$) error {\n");
+    printer->Indent();
+    printer->Print("return x.ClientStream.SendMsg(m)\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+
+  if (genRecv) {
+    printer->Print(vars,
+                   "func (x *$StreamType$) Recv() (*$Response$, error) {\n");
+    printer->Indent();
+    printer->Print(vars, "m := new($Response$)\n");
+    vars["Error_Check"] = "err := x.ClientStream.RecvMsg(m); err != nil";
+    GenerateError(printer, vars);
+    printer->Print("return m, nil\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+
+  if (genCloseAndRecv) {
+    printer->Print(
+        vars, "func (x *$StreamType$) CloseAndRecv() (*$Response$, error) {\n");
+    printer->Indent();
+    vars["Error_Check"] = "err := x.ClientStream.CloseSend(); err != nil";
+    GenerateError(printer, vars);
+    printer->Print(vars, "m := new($Response$)\n");
+    vars["Error_Check"] = "err := x.ClientStream.RecvMsg(m); err != nil";
+    GenerateError(printer, vars);
+    printer->Print("return m, nil\n");
+    printer->Outdent();
+    printer->Print("}\n\n");
+  }
+}
+
+// Generates client API for the service
+void GenerateService(const grpc_generator::Service *service,
+                     grpc_generator::Printer *printer,
+                     std::map<grpc::string, grpc::string> vars) {
+  vars["Service"] = exportName(service->name());
+  // Client Interface
+  printer->Print(vars, "// Client API for $Service$ service\n");
+  printer->Print(vars, "type $Service$Client interface {\n");
+  printer->Indent();
+  vars["Ending"] = "\n";
+  for (int i = 0; i < service->method_count(); i++) {
+    GenerateClientMethodSignature(service->method(i).get(), printer, vars);
+  }
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  // Client structure
+  vars["ServiceUnexported"] = unexportName(vars["Service"]);
+  printer->Print(vars, "type $ServiceUnexported$Client struct {\n");
+  printer->Indent();
+  printer->Print(vars, "cc $grpc$.ClientConnInterface\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  // NewClient
+  printer->Print(vars,
+                 "func New$Service$Client(cc $grpc$.ClientConnInterface) "
+                 "$Service$Client {\n");
+  printer->Indent();
+  printer->Print(vars, "return &$ServiceUnexported$Client{cc}");
+  printer->Outdent();
+  printer->Print("\n}\n\n");
+
+  int unary_methods = 0, streaming_methods = 0;
+  vars["ServiceDesc"] = "_" + vars["Service"] + "_serviceDesc";
+  for (int i = 0; i < service->method_count(); i++) {
+    auto method = service->method(i);
+    if (method->NoStreaming()) {
+      vars["MethodDesc"] =
+          vars["ServiceDesc"] + ".Method[" + as_string(unary_methods) + "]";
+      unary_methods++;
+    } else {
+      vars["MethodDesc"] = vars["ServiceDesc"] + ".Streams[" +
+                           as_string(streaming_methods) + "]";
+      streaming_methods++;
+    }
+    GenerateClientMethod(method.get(), printer, vars);
+  }
+
+  // Server Interface
+  printer->Print(vars, "// Server API for $Service$ service\n");
+  printer->Print(vars, "type $Service$Server interface {\n");
+  printer->Indent();
+  vars["Ending"] = "\n";
+  for (int i = 0; i < service->method_count(); i++) {
+    GenerateServerMethodSignature(service->method(i).get(), printer, vars);
+  }
+  printer->Print(vars, "mustEmbedUnimplemented$Service$Server()\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  printer->Print(vars, "type Unimplemented$Service$Server struct {\n");
+  printer->Print("}\n\n");
+
+  vars["Ending"] = " {\n";
+  for (int i = 0; i < service->method_count(); i++) {
+    auto method = service->method(i);
+    vars["Method"] = exportName(method->name());
+    vars["Nil"] = method->NoStreaming() ? "nil, " : "";
+    printer->Print(vars, "func (Unimplemented$Service$Server) ");
+    GenerateServerMethodSignature(method.get(), printer, vars);
+    printer->Indent();
+    printer->Print(vars,
+                   "return $Nil$status.Errorf(codes.Unimplemented, \"method "
+                   "$Method$ not implemented\")\n");
+    printer->Outdent();
+    printer->Print("}\n");
+    printer->Print("\n");
+  }
+
+  printer->Print(vars,
+                 "func (Unimplemented$Service$Server) "
+                 "mustEmbedUnimplemented$Service$Server() {}");
+  printer->Print("\n\n");
+
+  printer->Print(vars, "type Unsafe$Service$Server interface {\n");
+  printer->Indent();
+  printer->Print(vars, "mustEmbedUnimplemented$Service$Server()\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+  // Server registration.
+  printer->Print(vars,
+                 "func Register$Service$Server(s $grpc$.ServiceRegistrar, srv "
+                 "$Service$Server) {\n");
+  printer->Indent();
+  printer->Print(vars, "s.RegisterService(&$ServiceDesc$, srv)\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+
+  for (int i = 0; i < service->method_count(); i++) {
+    GenerateServerMethod(service->method(i).get(), printer, vars);
+  }
+
+  // Service Descriptor
+  printer->Print(vars, "var $ServiceDesc$ = $grpc$.ServiceDesc{\n");
+  printer->Indent();
+  printer->Print(vars, "ServiceName: \"$ServicePrefix$$Service$\",\n");
+  printer->Print(vars, "HandlerType: (*$Service$Server)(nil),\n");
+  printer->Print(vars, "Methods: []$grpc$.MethodDesc{\n");
+  printer->Indent();
+  for (int i = 0; i < service->method_count(); i++) {
+    auto method = service->method(i);
+    vars["Method"] = exportName(method->name());
+    vars["Handler"] = "_" + vars["Service"] + "_" + vars["Method"] + "_Handler";
+    if (method->NoStreaming()) {
+      printer->Print("{\n");
+      printer->Indent();
+      printer->Print(vars, "MethodName: \"$Method$\",\n");
+      printer->Print(vars, "Handler:    $Handler$,\n");
+      printer->Outdent();
+      printer->Print("},\n");
+    }
+  }
+  printer->Outdent();
+  printer->Print("},\n");
+  printer->Print(vars, "Streams: []$grpc$.StreamDesc{\n");
+  printer->Indent();
+  for (int i = 0; i < service->method_count(); i++) {
+    auto method = service->method(i);
+    vars["Method"] = exportName(method->name());
+    vars["Handler"] = "_" + vars["Service"] + "_" + vars["Method"] + "_Handler";
+    if (!method->NoStreaming()) {
+      printer->Print("{\n");
+      printer->Indent();
+      printer->Print(vars, "StreamName:    \"$Method$\",\n");
+      printer->Print(vars, "Handler:       $Handler$,\n");
+      if (ClientOnlyStreaming(method.get())) {
+        printer->Print("ClientStreams: true,\n");
+      } else if (ServerOnlyStreaming(method.get())) {
+        printer->Print("ServerStreams: true,\n");
+      } else {
+        printer->Print("ServerStreams: true,\n");
+        printer->Print("ClientStreams: true,\n");
+      }
+      printer->Outdent();
+      printer->Print("},\n");
+    }
+  }
+  printer->Outdent();
+  printer->Print("},\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+}  // namespace
+
+// Returns source for the service
+grpc::string GenerateServiceSource(grpc_generator::File *file,
+                                   const grpc_generator::Service *service,
+                                   grpc_go_generator::Parameters *parameters) {
+  grpc::string out;
+  auto p = file->CreatePrinter(&out, '\t');
+  p->SetIndentationSize(1);
+  auto printer = p.get();
+  std::map<grpc::string, grpc::string> vars;
+  vars["Package"] = parameters->package_name;
+  vars["ServicePrefix"] = parameters->service_prefix;
+  if (!parameters->service_prefix.empty()) vars["ServicePrefix"].append(".");
+  vars["grpc"] = "grpc";
+  vars["context"] = "context";
+  GenerateImports(file, printer, vars);
+  if (parameters->custom_method_io_type != "") {
+    vars["CustomMethodIO"] = parameters->custom_method_io_type;
+  }
+  GenerateService(service, printer, vars);
+  return out;
+}
+}  // Namespace grpc_go_generator

third_party/flatbuffers/grpc/src/compiler/go_generator.h

@@ -0,0 +1,33 @@
+#ifndef GRPC_INTERNAL_COMPILER_GO_GENERATOR_H
+#define GRPC_INTERNAL_COMPILER_GO_GENERATOR_H
+
+// go generator is used to generate GRPC code for serialization system, such as
+// flatbuffers
+#include <memory>
+#include <vector>
+
+#include "src/compiler/schema_interface.h"
+
+namespace grpc_go_generator {
+
+struct Parameters {
+  // Defines the custom parameter types for methods
+  // eg: flatbuffers uses flatbuffers.Builder as input for the client and output
+  // for the server
+  grpc::string custom_method_io_type;
+
+  // Package name for the service
+  grpc::string package_name;
+
+  // Prefix for RPC Calls
+  grpc::string service_prefix;
+};
+
+// Return the source of the generated service file.
+grpc::string GenerateServiceSource(grpc_generator::File *file,
+                                   const grpc_generator::Service *service,
+                                   grpc_go_generator::Parameters *parameters);
+
+}  // namespace grpc_go_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_GO_GENERATOR_H

third_party/flatbuffers/grpc/src/compiler/java_generator.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2016 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NET_GRPC_COMPILER_JAVA_GENERATOR_H_
+#define NET_GRPC_COMPILER_JAVA_GENERATOR_H_
+
+#include <stdlib.h>  // for abort()
+#include <iostream>
+#include <map>
+#include <string>
+
+#include "src/compiler/schema_interface.h"
+
+class LogMessageVoidify {
+ public:
+  LogMessageVoidify() {}
+  // This has to be an operator with a precedence lower than << but
+  // higher than ?:
+  void operator&(std::ostream&) {}
+};
+
+class LogHelper {
+  std::ostream* os_;
+
+ public:
+  LogHelper(std::ostream* os) : os_(os) {}
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning( \
+    disable : 4722)  // the flow of control terminates in a destructor
+  // (needed to compile ~LogHelper where destructor emits abort intentionally -
+  // inherited from grpc/java code generator).
+#endif
+  ~LogHelper() {
+    *os_ << std::endl;
+    ::abort();
+  }
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+  std::ostream& get_os() const { return *os_; }
+};
+
+// Abort the program after logging the mesage if the given condition is not
+// true. Otherwise, do nothing.
+#define GRPC_CODEGEN_CHECK(x)                                            \
+  (x) ? (void)0                                                          \
+      : LogMessageVoidify() & LogHelper(&std::cerr).get_os()             \
+                                  << "CHECK FAILED: " << __FILE__ << ":" \
+                                  << __LINE__ << ": "
+
+// Abort the program after logging the mesage.
+#define GRPC_CODEGEN_FAIL GRPC_CODEGEN_CHECK(false)
+
+namespace grpc_java_generator {
+struct Parameters {
+  //        //Defines the custom parameter types for methods
+  //        //eg: flatbuffers uses flatbuffers.Builder as input for the client
+  //        and output for the server grpc::string custom_method_io_type;
+
+  // Package name for the service
+  grpc::string package_name;
+};
+
+// Return the source of the generated service file.
+grpc::string GenerateServiceSource(grpc_generator::File* file,
+                                   const grpc_generator::Service* service,
+                                   grpc_java_generator::Parameters* parameters);
+
+}  // namespace grpc_java_generator
+
+#endif  // NET_GRPC_COMPILER_JAVA_GENERATOR_H_

third_party/flatbuffers/grpc/src/compiler/python_generator.cc

@@ -0,0 +1,151 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <map>
+#include <sstream>
+
+#include "flatbuffers/util.h"
+#include "src/compiler/python_generator.h"
+
+namespace grpc_python_generator {
+namespace {
+
+static grpc::string GenerateMethodType(const grpc_generator::Method *method) {
+
+  if (method->NoStreaming())
+    return "unary_unary";
+
+  if (method->ServerStreaming())
+    return "unary_stream";
+
+  if (method->ClientStreaming())
+    return "stream_unary";
+
+  return "stream_stream";
+}
+
+grpc::string GenerateMethodInput(const grpc_generator::Method *method) {
+
+  if (method->NoStreaming() || method->ServerStreaming())
+    return "self, request, context";
+
+  return "self, request_iterator, context";
+}
+
+void GenerateStub(const grpc_generator::Service *service,
+                  grpc_generator::Printer *printer,
+                  std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "class $ServiceName$Stub(object):\n");
+  printer->Indent();
+  printer->Print("\"\"\" Interface exported by the server. \"\"\"");
+  printer->Print("\n\n");
+  printer->Print("def __init__(self, channel):\n");
+  printer->Indent();
+  printer->Print("\"\"\" Constructor. \n\n");
+  printer->Print("Args: \n");
+  printer->Print("channel: A grpc.Channel. \n");
+  printer->Print("\"\"\"\n\n");
+
+  for (int j = 0; j < service->method_count(); j++) {
+    auto method = service->method(j);
+    vars["MethodName"] = method->name();
+    vars["MethodType"] = GenerateMethodType(&*method);
+    printer->Print(vars, "self.$MethodName$ = channel.$MethodType$(\n");
+    printer->Indent();
+    printer->Print(vars, "\"/$PATH$$ServiceName$/$MethodName$\"\n");
+    printer->Print(")\n");
+    printer->Outdent();
+    printer->Print("\n");
+  }
+  printer->Outdent();
+  printer->Outdent();
+  printer->Print("\n");
+}
+
+void GenerateServicer(const grpc_generator::Service *service,
+                      grpc_generator::Printer *printer,
+                      std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "class $ServiceName$Servicer(object):\n");
+  printer->Indent();
+  printer->Print("\"\"\" Interface exported by the server. \"\"\"");
+  printer->Print("\n\n");
+
+  for (int j = 0; j < service->method_count(); j++) {
+    auto method = service->method(j);
+    vars["MethodName"] = method->name();
+    vars["MethodInput"] = GenerateMethodInput(&*method);
+    printer->Print(vars, "def $MethodName$($MethodInput$):\n");
+    printer->Indent();
+    printer->Print("context.set_code(grpc.StatusCode.UNIMPLEMENTED)\n");
+    printer->Print("context.set_details('Method not implemented!')\n");
+    printer->Print("raise NotImplementedError('Method not implemented!')\n");
+    printer->Outdent();
+    printer->Print("\n\n");
+  }
+  printer->Outdent();
+  printer->Print("\n");
+
+}
+
+void GenerateRegister(const grpc_generator::Service *service,
+                      grpc_generator::Printer *printer,
+                      std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "def add_$ServiceName$Servicer_to_server(servicer, server):\n");
+  printer->Indent();
+  printer->Print("rpc_method_handlers = {\n");
+  printer->Indent();
+  for (int j = 0; j < service->method_count(); j++) {
+    auto method = service->method(j);
+    vars["MethodName"] = method->name();
+    vars["MethodType"] = GenerateMethodType(&*method);
+    printer->Print(vars, "'$MethodName$': grpc.$MethodType$_rpc_method_handler(\n");
+    printer->Indent();
+    printer->Print(vars, "servicer.$MethodName$\n");
+    printer->Outdent();
+    printer->Print("),\n");
+  }
+  printer->Outdent();
+  printer->Print("}\n");
+  printer->Print(vars, "generic_handler = grpc.method_handlers_generic_handler(\n");
+  printer->Indent();
+  printer->Print(vars, "'$PATH$$ServiceName$', rpc_method_handlers)\n");
+  printer->Outdent();
+  printer->Print("server.add_generic_rpc_handlers((generic_handler,))");
+  printer->Outdent();
+  printer->Print("\n");
+}
+} // namespace
+
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service) {
+  grpc::string output;
+  std::map<grpc::string, grpc::string> vars;
+  vars["PATH"] = file->package();
+  if (!file->package().empty()) { vars["PATH"].append("."); }
+  vars["ServiceName"] = service->name();
+  auto printer = file->CreatePrinter(&output);
+  GenerateStub(service, &*printer, &vars);
+  GenerateServicer(service, &*printer, &vars);
+  GenerateRegister(service, &*printer, &vars);
+  return output;
+}
+
+}  // namespace grpc_python_generator

third_party/flatbuffers/grpc/src/compiler/python_generator.h

@@ -0,0 +1,32 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_COMPILER_PYTHON_GENERATOR_H
+#define GRPC_INTERNAL_COMPILER_PYTHON_GENERATOR_H
+
+#include <utility>
+
+#include "src/compiler/schema_interface.h"
+
+namespace grpc_python_generator {
+
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service);
+}  // namespace grpc_python_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_PYTHON_GENERATOR_H

third_party/flatbuffers/grpc/src/compiler/schema_interface.h

@@ -0,0 +1,119 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H
+#define GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#ifndef GRPC_CUSTOM_STRING
+#  include <string>
+#  define GRPC_CUSTOM_STRING std::string
+#endif
+
+namespace grpc {
+
+typedef GRPC_CUSTOM_STRING string;
+
+}  // namespace grpc
+
+namespace grpc_generator {
+
+// A common interface for objects having comments in the source.
+// Return formatted comments to be inserted in generated code.
+struct CommentHolder {
+  virtual ~CommentHolder() {}
+  virtual grpc::string GetLeadingComments(const grpc::string prefix) const = 0;
+  virtual grpc::string GetTrailingComments(const grpc::string prefix) const = 0;
+  virtual std::vector<grpc::string> GetAllComments() const = 0;
+};
+
+// An abstract interface representing a method.
+struct Method : public CommentHolder {
+  virtual ~Method() {}
+
+  virtual grpc::string name() const = 0;
+
+  virtual grpc::string input_type_name() const = 0;
+  virtual grpc::string output_type_name() const = 0;
+
+  virtual bool get_module_and_message_path_input(
+      grpc::string *str, grpc::string generator_file_name,
+      bool generate_in_pb2_grpc, grpc::string import_prefix) const = 0;
+  virtual bool get_module_and_message_path_output(
+      grpc::string *str, grpc::string generator_file_name,
+      bool generate_in_pb2_grpc, grpc::string import_prefix) const = 0;
+
+  virtual std::vector<grpc::string> get_input_namespace_parts() const = 0;
+  virtual grpc::string get_input_type_name() const = 0;
+  virtual std::vector<grpc::string> get_output_namespace_parts() const = 0;
+  virtual grpc::string get_output_type_name() const = 0;
+
+  virtual grpc::string get_fb_builder() const = 0;
+
+  virtual bool NoStreaming() const = 0;
+  virtual bool ClientStreaming() const = 0;
+  virtual bool ServerStreaming() const = 0;
+  virtual bool BidiStreaming() const = 0;
+};
+
+// An abstract interface representing a service.
+struct Service : public CommentHolder {
+  virtual ~Service() {}
+
+  virtual std::vector<grpc::string> namespace_parts() const = 0;
+  virtual grpc::string name() const = 0;
+  virtual bool is_internal() const = 0;
+
+  virtual int method_count() const = 0;
+  virtual std::unique_ptr<const Method> method(int i) const = 0;
+};
+
+struct Printer {
+  virtual ~Printer() {}
+
+  virtual void Print(const std::map<grpc::string, grpc::string> &vars,
+                     const char *template_string) = 0;
+  virtual void Print(const char *string) = 0;
+  virtual void SetIndentationSize(const size_t size) = 0;
+  virtual void Indent() = 0;
+  virtual void Outdent() = 0;
+};
+
+// An interface that allows the source generated to be output using various
+// libraries/idls/serializers.
+struct File : public CommentHolder {
+  virtual ~File() {}
+
+  virtual grpc::string filename() const = 0;
+  virtual grpc::string filename_without_ext() const = 0;
+  virtual grpc::string package() const = 0;
+  virtual std::vector<grpc::string> package_parts() const = 0;
+  virtual grpc::string additional_headers() const = 0;
+
+  virtual int service_count() const = 0;
+  virtual std::unique_ptr<const Service> service(int i) const = 0;
+
+  virtual std::unique_ptr<Printer> CreatePrinter(
+      grpc::string *str, const char indentation_type = ' ') const = 0;
+};
+}  // namespace grpc_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H

third_party/flatbuffers/grpc/src/compiler/swift_generator.cc

@@ -0,0 +1,440 @@
+/*
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * NOTE: The following implementation is a translation for the Swift-grpc
+ * generator since flatbuffers doesnt allow plugins for now. if an issue arises
+ * please open an issue in the flatbuffers repository. This file should always
+ * be maintained according to the Swift-grpc repository
+ */
+#include <map>
+#include <sstream>
+
+#include "flatbuffers/util.h"
+#include "src/compiler/schema_interface.h"
+#include "src/compiler/swift_generator.h"
+
+namespace grpc_swift_generator {
+namespace {
+
+static std::string WrapInNameSpace(const std::vector<std::string> &components,
+                            const grpc::string &name) {
+  std::string qualified_name;
+  for (auto it = components.begin(); it != components.end(); ++it)
+    qualified_name += *it + "_";
+  return qualified_name + name;
+}
+
+static grpc::string GenerateMessage(const std::vector<std::string> &components,
+                             const grpc::string &name) {
+  return "Message<" + WrapInNameSpace(components, name) + ">";
+}
+
+// MARK: - Client
+
+static void GenerateClientFuncName(const grpc_generator::Method *method,
+                            grpc_generator::Printer *printer,
+                            std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  if (method->NoStreaming()) {
+    printer->Print(vars,
+                   "  $GenAccess$func $MethodName$(\n"
+                   "    _ request: $Input$\n"
+                   "    , callOptions: CallOptions?$isNil$\n"
+                   "  ) -> UnaryCall<$Input$, $Output$>");
+    return;
+  }
+
+  if (method->ServerStreaming()) {
+    printer->Print(vars,
+                   "  $GenAccess$func $MethodName$(\n"
+                   "    _ request: $Input$\n"
+                   "    , callOptions: CallOptions?$isNil$,\n"
+                   "    handler: @escaping ($Output$) -> Void\n"
+                   "  ) -> ServerStreamingCall<$Input$, $Output$>");
+    return;
+  }
+
+  if (method->ClientStreaming()) {
+    printer->Print(vars,
+                   "  $GenAccess$func $MethodName$(\n"
+                   "    callOptions: CallOptions?$isNil$\n"
+                   "  ) -> ClientStreamingCall<$Input$, $Output$>");
+    return;
+  }
+
+  printer->Print(vars,
+                 "  $GenAccess$func $MethodName$(\n"
+                 "    callOptions: CallOptions?$isNil$,\n"
+                 "    handler: @escaping ($Output$ ) -> Void\n"
+                 "  ) -> BidirectionalStreamingCall<$Input$, $Output$>");
+}
+
+static void GenerateClientFuncBody(const grpc_generator::Method *method,
+                            grpc_generator::Printer *printer,
+                            std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  vars["Interceptor"] =
+      "interceptors: self.interceptors?.make$MethodName$Interceptors() ?? []";
+  if (method->NoStreaming()) {
+    printer->Print(
+        vars,
+        "    return self.makeUnaryCall(\n"
+        "      path: \"/$PATH$$ServiceName$/$MethodName$\",\n"
+        "      request: request,\n"
+        "      callOptions: callOptions ?? self.defaultCallOptions,\n"
+        "      $Interceptor$\n"
+        "    )\n");
+    return;
+  }
+
+  if (method->ServerStreaming()) {
+    printer->Print(
+        vars,
+        "    return self.makeServerStreamingCall(\n"
+        "      path: \"/$PATH$$ServiceName$/$MethodName$\",\n"
+        "      request: request,\n"
+        "      callOptions: callOptions ?? self.defaultCallOptions,\n"
+        "      $Interceptor$,\n"
+        "      handler: handler\n"
+        "    )\n");
+    return;
+  }
+
+  if (method->ClientStreaming()) {
+    printer->Print(
+        vars,
+        "    return self.makeClientStreamingCall(\n"
+        "      path: \"/$PATH$$ServiceName$/$MethodName$\",\n"
+        "      callOptions: callOptions ?? self.defaultCallOptions,\n"
+        "      $Interceptor$\n"
+        "    )\n");
+    return;
+  }
+  printer->Print(vars,
+                 "    return self.makeBidirectionalStreamingCall(\n"
+                 "      path: \"/$PATH$$ServiceName$/$MethodName$\",\n"
+                 "      callOptions: callOptions ?? self.defaultCallOptions,\n"
+                 "      $Interceptor$,\n"
+                 "      handler: handler\n"
+                 "    )\n");
+}
+
+void GenerateClientProtocol(const grpc_generator::Service *service,
+                            grpc_generator::Printer *printer,
+                            std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(
+      vars,
+      "$ACCESS$ protocol $ServiceQualifiedName$ClientProtocol: GRPCClient {");
+  printer->Print("\n\n");
+  printer->Print("  var serviceName: String { get }");
+  printer->Print("\n\n");
+  printer->Print(
+      vars,
+      "  var interceptors: "
+      "$ServiceQualifiedName$ClientInterceptorFactoryProtocol? { get }");
+  printer->Print("\n\n");
+
+  vars["GenAccess"] = "";
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    vars["isNil"] = "";
+    GenerateClientFuncName(method.get(), &*printer, &vars);
+    printer->Print("\n\n");
+  }
+  printer->Print("}\n\n");
+
+  printer->Print(vars, "extension $ServiceQualifiedName$ClientProtocol {");
+  printer->Print("\n\n");
+  printer->Print(vars,
+                 "  $ACCESS$ var serviceName: String { "
+                 "\"$PATH$$ServiceName$\" }\n");
+
+  vars["GenAccess"] = service->is_internal() ? "internal " : "public ";
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    vars["isNil"] = " = nil";
+    printer->Print("\n");
+    GenerateClientFuncName(method.get(), &*printer, &vars);
+    printer->Print(" {\n");
+    GenerateClientFuncBody(method.get(), &*printer, &vars);
+    printer->Print("  }\n");
+  }
+  printer->Print("}\n\n");
+
+  printer->Print(vars,
+                 "$ACCESS$ protocol "
+                 "$ServiceQualifiedName$ClientInterceptorFactoryProtocol {\n");
+
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    printer->Print(
+        vars,
+        "  /// - Returns: Interceptors to use when invoking '$MethodName$'.\n");
+    printer->Print(vars,
+                   "  func make$MethodName$Interceptors() -> "
+                   "[ClientInterceptor<$Input$, $Output$>]\n\n");
+  }
+  printer->Print("}\n\n");
+}
+
+void GenerateClientClass(grpc_generator::Printer *printer,
+                         std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars,
+                 "$ACCESS$ final class $ServiceQualifiedName$ServiceClient: "
+                 "$ServiceQualifiedName$ClientProtocol {\n");
+  printer->Print(vars, "  $ACCESS$ let channel: GRPCChannel\n");
+  printer->Print(vars, "  $ACCESS$ var defaultCallOptions: CallOptions\n");
+  printer->Print(vars,
+                 "  $ACCESS$ var interceptors: "
+                 "$ServiceQualifiedName$ClientInterceptorFactoryProtocol?\n");
+  printer->Print("\n");
+  printer->Print(
+      vars,
+      "  $ACCESS$ init(\n"
+      "    channel: GRPCChannel,\n"
+      "    defaultCallOptions: CallOptions = CallOptions(),\n"
+      "    interceptors: "
+      "$ServiceQualifiedName$ClientInterceptorFactoryProtocol? = nil\n"
+      "  ) {\n");
+  printer->Print("    self.channel = channel\n");
+  printer->Print("    self.defaultCallOptions = defaultCallOptions\n");
+  printer->Print("    self.interceptors = interceptors\n");
+  printer->Print("  }");
+  printer->Print("\n");
+  printer->Print("}\n");
+}
+
+// MARK: - Server
+
+grpc::string GenerateServerFuncName(const grpc_generator::Method *method) {
+  if (method->NoStreaming()) {
+    return "func $MethodName$(request: $Input$"
+           ", context: StatusOnlyCallContext) -> EventLoopFuture<$Output$>";
+  }
+
+  if (method->ClientStreaming()) {
+    return "func $MethodName$(context: UnaryResponseCallContext<$Output$>) -> "
+           "EventLoopFuture<(StreamEvent<$Input$"
+           ">) -> Void>";
+  }
+
+  if (method->ServerStreaming()) {
+    return "func $MethodName$(request: $Input$"
+           ", context: StreamingResponseCallContext<$Output$>) -> "
+           "EventLoopFuture<GRPCStatus>";
+  }
+  return "func $MethodName$(context: StreamingResponseCallContext<$Output$>) "
+         "-> EventLoopFuture<(StreamEvent<$Input$>) -> Void>";
+}
+
+grpc::string GenerateServerExtensionBody(const grpc_generator::Method *method) {
+  grpc::string start = "    case \"$MethodName$\":\n    ";
+  grpc::string interceptors =
+      "      interceptors: self.interceptors?.make$MethodName$Interceptors() "
+      "?? [],\n";
+  if (method->NoStreaming()) {
+    return start +
+           "return UnaryServerHandler(\n"
+           "      context: context,\n"
+           "      requestDeserializer: GRPCPayloadDeserializer<$Input$>(),\n"
+           "      responseSerializer: GRPCPayloadSerializer<$Output$>(),\n" +
+           interceptors +
+           "      userFunction: self.$MethodName$(request:context:))\n";
+  }
+  if (method->ServerStreaming()) {
+    return start +
+           "return ServerStreamingServerHandler(\n"
+           "      context: context,\n"
+           "      requestDeserializer: GRPCPayloadDeserializer<$Input$>(),\n"
+           "      responseSerializer: GRPCPayloadSerializer<$Output$>(),\n" +
+           interceptors +
+           "      userFunction: self.$MethodName$(request:context:))\n";
+  }
+  if (method->ClientStreaming()) {
+    return start +
+           "return ClientStreamingServerHandler(\n"
+           "      context: context,\n"
+           "      requestDeserializer: GRPCPayloadDeserializer<$Input$>(),\n"
+           "      responseSerializer: GRPCPayloadSerializer<$Output$>(),\n" +
+           interceptors +
+           "      observerFactory: self.$MethodName$(context:))\n";
+  }
+  if (method->BidiStreaming()) {
+    return start +
+           "return BidirectionalStreamingServerHandler(\n"
+           "      context: context,\n"
+           "      requestDeserializer: GRPCPayloadDeserializer<$Input$>(),\n"
+           "      responseSerializer: GRPCPayloadSerializer<$Output$>(),\n" +
+           interceptors +
+           "      observerFactory: self.$MethodName$(context:))\n";
+  }
+  return "";
+}
+
+void GenerateServerProtocol(const grpc_generator::Service *service,
+                            grpc_generator::Printer *printer,
+                            std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars,
+                 "$ACCESS$ protocol $ServiceQualifiedName$Provider: "
+                 "CallHandlerProvider {\n");
+  printer->Print(
+      vars,
+      "  var interceptors: "
+      "$ServiceQualifiedName$ServerInterceptorFactoryProtocol? { get }\n");
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    printer->Print("  ");
+    auto func = GenerateServerFuncName(method.get());
+    printer->Print(vars, func.c_str());
+    printer->Print("\n");
+  }
+  printer->Print("}\n\n");
+
+  printer->Print(vars, "$ACCESS$ extension $ServiceQualifiedName$Provider {\n");
+  printer->Print("\n");
+  printer->Print(vars,
+                 "  var serviceName: Substring { return "
+                 "\"$PATH$$ServiceName$\" }\n");
+  printer->Print("\n");
+  printer->Print(
+      "  func handle(method name: Substring, context: "
+      "CallHandlerContext) -> GRPCServerHandlerProtocol? {\n");
+  printer->Print("    switch name {\n");
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    auto body = GenerateServerExtensionBody(method.get());
+    printer->Print(vars, body.c_str());
+    printer->Print("\n");
+  }
+  printer->Print("    default: return nil;\n");
+  printer->Print("    }\n");
+  printer->Print("  }\n\n");
+  printer->Print("}\n\n");
+
+  printer->Print(vars,
+                 "$ACCESS$ protocol "
+                 "$ServiceQualifiedName$ServerInterceptorFactoryProtocol {\n");
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Input"] = GenerateMessage(method->get_input_namespace_parts(),
+                                    method->get_input_type_name());
+    vars["Output"] = GenerateMessage(method->get_output_namespace_parts(),
+                                     method->get_output_type_name());
+    vars["MethodName"] = method->name();
+    printer->Print(
+        vars,
+        "  /// - Returns: Interceptors to use when handling '$MethodName$'.\n"
+        "  ///   Defaults to calling `self.makeInterceptors()`.\n");
+    printer->Print(vars,
+                   "  func make$MethodName$Interceptors() -> "
+                   "[ServerInterceptor<$Input$, $Output$>]\n\n");
+  }
+  printer->Print("}");
+}
+} // namespace
+
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service) {
+  grpc::string output;
+  std::map<grpc::string, grpc::string> vars;
+  vars["PATH"] = file->package();
+  if (!file->package().empty()) { vars["PATH"].append("."); }
+  vars["ServiceQualifiedName"] =
+      WrapInNameSpace(service->namespace_parts(), service->name());
+  vars["ServiceName"] = service->name();
+  vars["ACCESS"] = service->is_internal() ? "internal" : "public";
+  auto printer = file->CreatePrinter(&output);
+  printer->Print(
+      vars,
+      "/// Usage: instantiate $ServiceQualifiedName$ServiceClient, then call "
+      "methods of this protocol to make API calls.\n");
+  GenerateClientProtocol(service, &*printer, &vars);
+  GenerateClientClass(&*printer, &vars);
+  printer->Print("\n");
+  GenerateServerProtocol(service, &*printer, &vars);
+  return output;
+}
+
+grpc::string GenerateHeader() {
+  grpc::string code;
+  code +=
+      "/// The following code is generated by the Flatbuffers library which "
+      "might not be in sync with grpc-swift\n";
+  code +=
+      "/// in case of an issue please open github issue, though it would be "
+      "maintained\n";
+  code += "\n";
+  code += "// swiftlint:disable all\n";
+  code += "// swiftformat:disable all\n";
+  code += "\n";
+  code += "import Foundation\n";
+  code += "import GRPC\n";
+  code += "import NIO\n";
+  code += "import NIOHTTP1\n";
+  code += "import FlatBuffers\n";
+  code += "\n";
+  code +=
+      "public protocol GRPCFlatBufPayload: GRPCPayload, FlatBufferGRPCMessage "
+      "{}\n";
+
+  code += "public extension GRPCFlatBufPayload {\n";
+  code += "  init(serializedByteBuffer: inout NIO.ByteBuffer) throws {\n";
+  code +=
+      "    self.init(byteBuffer: FlatBuffers.ByteBuffer(contiguousBytes: "
+      "serializedByteBuffer.readableBytesView, count: "
+      "serializedByteBuffer.readableBytes))\n";
+  code += "  }\n";
+
+  code += "  func serialize(into buffer: inout NIO.ByteBuffer) throws {\n";
+  code +=
+      "    let buf = UnsafeRawBufferPointer(start: self.rawPointer, count: "
+      "Int(self.size))\n";
+  code += "    buffer.writeBytes(buf)\n";
+  code += "  }\n";
+  code += "}\n";
+  code += "extension Message: GRPCFlatBufPayload {}\n";
+  return code;
+}
+}  // namespace grpc_swift_generator

third_party/flatbuffers/grpc/src/compiler/swift_generator.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <memory>
+#include <vector>
+
+#include "src/compiler/schema_interface.h"
+
+#ifndef GRPC_CUSTOM_STRING
+#  include <string>
+#  define GRPC_CUSTOM_STRING std::string
+#endif
+
+namespace grpc {
+
+typedef GRPC_CUSTOM_STRING string;
+
+}  // namespace grpc
+
+namespace grpc_swift_generator {
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service);
+grpc::string GenerateHeader();
+}  // namespace grpc_swift_generator

third_party/flatbuffers/grpc/src/compiler/ts_generator.cc

@@ -0,0 +1,523 @@
+/*
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * NOTE: The following implementation is a translation for the Swift-grpc
+ * generator since flatbuffers doesnt allow plugins for now. if an issue arises
+ * please open an issue in the flatbuffers repository. This file should always
+ * be maintained according to the Swift-grpc repository
+ */
+
+#include "src/compiler/ts_generator.h"
+
+#include <map>
+#include <sstream>
+
+#include "flatbuffers/util.h"
+#include "src/compiler/schema_interface.h"
+
+namespace grpc_ts_generator {
+namespace {
+
+static grpc::string GenerateNamespace(const std::vector<std::string> ns,
+                               const std::string filename,
+                               const bool include_separator) {
+  grpc::string path = "";
+  if (include_separator) path += ".";
+
+  for (auto it = ns.begin(); it < ns.end(); it++) {
+    if (include_separator) path += "/";
+    path += include_separator
+                ? flatbuffers::ConvertCase(*it, flatbuffers::Case::kDasher,
+                                           flatbuffers::Case::kUpperCamel)
+                : *it + "_";
+  }
+
+  if (include_separator) path += "/";
+  path += include_separator
+              ? flatbuffers::ConvertCase(filename, flatbuffers::Case::kDasher,
+                                         flatbuffers::Case::kUpperCamel)
+              : filename;
+  return path;
+}
+
+// MARK: - Shared code
+
+static void GenerateImports(const grpc_generator::Service *service,
+                     grpc_generator::Printer *printer,
+                     std::map<grpc::string, grpc::string> *dictonary,
+                     const bool grpc_var_import) {
+  auto vars = *dictonary;
+  printer->Print(
+      "// Generated GRPC code for FlatBuffers TS *** DO NOT EDIT ***\n");
+  printer->Print("import * as flatbuffers from 'flatbuffers';\n");
+
+  std::set<grpc::string> generated_imports;
+
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    auto output = method->get_output_type_name();
+    auto input = method->get_input_type_name();
+    auto input_namespace = method->get_input_namespace_parts();
+
+    vars["OUTPUT"] = output;
+    vars["INPUT"] = input;
+
+    if (generated_imports.find(output) == generated_imports.end()) {
+      generated_imports.insert(output);
+      vars["OUTPUT_DIR"] =
+          GenerateNamespace(method->get_output_namespace_parts(), output, true);
+      vars["Output_alias"] = GenerateNamespace(
+          method->get_output_namespace_parts(), output, false);
+      printer->Print(
+          vars, "import { $OUTPUT$ as $Output_alias$ } from '$OUTPUT_DIR$';\n");
+    }
+    if (generated_imports.find(input) == generated_imports.end()) {
+      generated_imports.insert(input);
+      vars["INPUT_DIR"] =
+          GenerateNamespace(method->get_output_namespace_parts(), input, true);
+      vars["Input_alias"] =
+          GenerateNamespace(method->get_output_namespace_parts(), input, false);
+      printer->Print(
+          vars, "import { $INPUT$ as $Input_alias$ } from '$INPUT_DIR$';\n");
+    }
+  }
+  printer->Print("\n");
+  if (grpc_var_import)
+    printer->Print("var grpc = require('@grpc/grpc-js');\n");
+  else
+    printer->Print("import * as grpc from '@grpc/grpc-js';\n");
+  printer->Print("\n");
+}
+
+// MARK: - Generate Main GRPC Code
+
+static void GetStreamType(grpc_generator::Printer *printer,
+                   const grpc_generator::Method *method,
+                   std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  auto client_streaming = method->ClientStreaming() || method->BidiStreaming();
+  auto server_streaming = method->ServerStreaming() || method->BidiStreaming();
+  vars["ClientStreaming"] = client_streaming ? "true" : "false";
+  vars["ServerStreaming"] = server_streaming ? "true" : "false";
+  printer->Print(vars, "requestStream: $ClientStreaming$,\n");
+  printer->Print(vars, "responseStream: $ServerStreaming$,\n");
+}
+
+static void GenerateSerializeMethod(grpc_generator::Printer *printer,
+                             std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "function serialize_$Type$(buffer_args) {\n");
+  printer->Indent();
+  printer->Print(vars, "if (!(buffer_args instanceof $Type$)) {\n");
+  printer->Indent();
+  printer->Print(vars,
+                 "throw new Error('Expected argument of type $VALUE$');\n");
+  printer->Outdent();
+  printer->Print("}\n");
+  printer->Print(vars, "return Buffer.from(buffer_args.serialize());\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+}
+
+static void GenerateDeserializeMethod(
+    grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "function deserialize_$Type$(buffer) {\n");
+  printer->Indent();
+  printer->Print(vars,
+                 "return $Type$.getRootAs$VALUE$(new "
+                 "flatbuffers.ByteBuffer(buffer))\n");
+  printer->Outdent();
+  printer->Print("}\n\n");
+}
+
+static void GenerateMethods(const grpc_generator::Service *service,
+                     grpc_generator::Printer *printer,
+                     std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+
+  std::set<grpc::string> generated_functions;
+
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    auto output = method->get_output_type_name();
+    auto input = method->get_input_type_name();
+
+    if (generated_functions.find(output) == generated_functions.end()) {
+      generated_functions.insert(output);
+      vars["VALUE"] = output;
+      vars["Type"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       output, false);
+      GenerateSerializeMethod(printer, &vars);
+      GenerateDeserializeMethod(printer, &vars);
+    }
+    printer->Print("\n");
+    if (generated_functions.find(input) == generated_functions.end()) {
+      generated_functions.insert(input);
+      vars["VALUE"] = input;
+      vars["Type"] =
+          GenerateNamespace(method->get_input_namespace_parts(), input, false);
+      GenerateSerializeMethod(printer, &vars);
+      GenerateDeserializeMethod(printer, &vars);
+    }
+  }
+}
+
+static void GenerateService(const grpc_generator::Service *service,
+                     grpc_generator::Printer *printer,
+                     std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  vars["NAME"] = service->name() + "Service";
+
+  printer->Print(vars, "var $NAME$ = exports.$NAME$ = {\n");
+  printer->Indent();
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["MethodName"] = method->name();
+    vars["OUTPUT"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       method->get_output_type_name(), false);
+    vars["INPUT"] = GenerateNamespace(method->get_input_namespace_parts(),
+                                      method->get_input_type_name(), false);
+    printer->Print(vars, "$MethodName$: {\n");
+    printer->Indent();
+    printer->Print(vars, "path: '/$PATH$$ServiceName$/$MethodName$',\n");
+    GetStreamType(printer, &*method, &vars);
+    printer->Print(vars, "requestType: flatbuffers.ByteBuffer,\n");
+    printer->Print(vars, "responseType: $OUTPUT$,\n");
+    printer->Print(vars, "requestSerialize: serialize_$INPUT$,\n");
+    printer->Print(vars, "requestDeserialize: deserialize_$INPUT$,\n");
+    printer->Print(vars, "responseSerialize: serialize_$OUTPUT$,\n");
+    printer->Print(vars, "responseDeserialize: deserialize_$OUTPUT$,\n");
+    printer->Outdent();
+    printer->Print("},\n");
+  }
+  printer->Outdent();
+  printer->Print("};\n");
+  printer->Print(vars,
+                 "exports.$ServiceName$Client = "
+                 "grpc.makeGenericClientConstructor($NAME$);");
+}
+
+} // namespace
+
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service,
+                      const grpc::string &filename) {
+  grpc::string output;
+  std::map<grpc::string, grpc::string> vars;
+
+  vars["PATH"] = file->package();
+
+  if (!file->package().empty()) { vars["PATH"].append("."); }
+
+  vars["ServiceName"] = service->name();
+  vars["FBSFile"] = service->name() + "_fbs";
+  vars["Filename"] = filename;
+  auto printer = file->CreatePrinter(&output);
+
+  GenerateImports(service, &*printer, &vars, true);
+  GenerateMethods(service, &*printer, &vars);
+  GenerateService(service, &*printer, &vars);
+  return output;
+}
+
+namespace {
+
+// MARK: - Generate Interface
+
+static void FillInterface(grpc_generator::Printer *printer,
+                   std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars,
+                 "interface I$ServiceName$Service_I$MethodName$ extends "
+                 "grpc.MethodDefinition<$INPUT$, $OUTPUT$> {\n");
+  printer->Indent();
+  printer->Print(vars, "path: string; // /$PATH$$ServiceName$/$MethodName$\n");
+  printer->Print(vars, "requestStream: boolean; // $ClientStreaming$\n");
+  printer->Print(vars, "responseStream: boolean; // $ServerStreaming$\n");
+  printer->Print(vars, "requestSerialize: grpc.serialize<$INPUT$>;\n");
+  printer->Print(vars, "requestDeserialize: grpc.deserialize<$INPUT$>;\n");
+  printer->Print(vars, "responseSerialize: grpc.serialize<$OUTPUT$>;\n");
+  printer->Print(vars, "responseDeserialize: grpc.deserialize<$OUTPUT$>;\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+static void GenerateInterfaces(const grpc_generator::Service *service,
+                        grpc_generator::Printer *printer,
+                        std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    auto client_streaming =
+        method->ClientStreaming() || method->BidiStreaming();
+    auto server_streaming =
+        method->ServerStreaming() || method->BidiStreaming();
+    vars["ClientStreaming"] = client_streaming ? "true" : "false";
+    vars["ServerStreaming"] = server_streaming ? "true" : "false";
+    vars["MethodName"] = method->name();
+    vars["OUTPUT"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       method->get_output_type_name(), false);
+    vars["INPUT"] = GenerateNamespace(method->get_input_namespace_parts(),
+                                      method->get_input_type_name(), false);
+    FillInterface(printer, &vars);
+    printer->Print("\n");
+  }
+}
+
+static void GenerateExportedInterface(
+    const grpc_generator::Service *service, grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars,
+                 "export interface I$ServiceName$Server extends "
+                 "grpc.UntypedServiceImplementation {\n");
+  printer->Indent();
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["Name"] = method->name();
+    vars["OUTPUT"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       method->get_output_type_name(), false);
+    vars["INPUT"] = GenerateNamespace(method->get_input_namespace_parts(),
+                                      method->get_input_type_name(), false);
+    if (method->BidiStreaming()) {
+      printer->Print(vars,
+                     "$Name$: grpc.handleBidiStreamingCall<$INPUT$, "
+                     "$OUTPUT$>;\n");
+      continue;
+    }
+    if (method->NoStreaming()) {
+      printer->Print(vars,
+                     "$Name$: grpc.handleUnaryCall<$INPUT$, "
+                     "$OUTPUT$>;\n");
+      continue;
+    }
+    if (method->ClientStreaming()) {
+      printer->Print(vars,
+                     "$Name$: grpc.handleClientStreamingCall<$INPUT$, "
+                     "$OUTPUT$>;\n");
+      continue;
+    }
+    if (method->ServerStreaming()) {
+      printer->Print(vars,
+                     "$Name$: grpc.handleServerStreamingCall<$INPUT$, "
+                     "$OUTPUT$>;\n");
+      continue;
+    }
+  }
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+static void GenerateMainInterface(const grpc_generator::Service *service,
+                           grpc_generator::Printer *printer,
+                           std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(
+      vars,
+      "interface I$ServiceName$Service extends "
+      "grpc.ServiceDefinition<grpc.UntypedServiceImplementation> {\n");
+  printer->Indent();
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["MethodName"] = method->name();
+    printer->Print(vars,
+                   "$MethodName$: I$ServiceName$Service_I$MethodName$;\n");
+  }
+  printer->Outdent();
+  printer->Print("}\n");
+  GenerateInterfaces(service, printer, &vars);
+  printer->Print("\n");
+  printer->Print(vars,
+                 "export const $ServiceName$Service: I$ServiceName$Service;\n");
+  printer->Print("\n");
+  GenerateExportedInterface(service, printer, &vars);
+}
+
+static grpc::string GenerateMetaData() { return "metadata: grpc.Metadata"; }
+
+static grpc::string GenerateOptions() { return "options: Partial<grpc.CallOptions>"; }
+
+static void GenerateUnaryClientInterface(
+    grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  grpc::string main = "$ISPUBLIC$$MethodName$(request: $INPUT$, ";
+  grpc::string callback =
+      "callback: (error: grpc.ServiceError | null, response: "
+      "$OUTPUT$) => void): grpc.ClientUnaryCall;\n";
+  auto meta_data = GenerateMetaData() + ", ";
+  auto options = GenerateOptions() + ", ";
+  printer->Print(vars, (main + callback).c_str());
+  printer->Print(vars, (main + meta_data + callback).c_str());
+  printer->Print(vars, (main + meta_data + options + callback).c_str());
+}
+
+static void GenerateClientWriteStreamInterface(
+    grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  grpc::string main = "$ISPUBLIC$$MethodName$(";
+  grpc::string callback =
+      "callback: (error: grpc.ServiceError | null, response: "
+      "$INPUT$) => void): "
+      "grpc.ClientWritableStream<$OUTPUT$>;\n";
+  auto meta_data = GenerateMetaData() + ", ";
+  auto options = GenerateOptions() + ", ";
+  printer->Print(vars, (main + callback).c_str());
+  printer->Print(vars, (main + meta_data + callback).c_str());
+  printer->Print(vars, (main + options + callback).c_str());
+  printer->Print(vars, (main + meta_data + options + callback).c_str());
+}
+
+static void GenerateClientReadableStreamInterface(
+    grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  grpc::string main = "$ISPUBLIC$$MethodName$(request: $INPUT$, ";
+  grpc::string end_function = "): grpc.ClientReadableStream<$OUTPUT$>;\n";
+  auto meta_data = GenerateMetaData();
+  auto options = GenerateOptions();
+  printer->Print(vars, (main + meta_data + end_function).c_str());
+  printer->Print(vars, (main + options + end_function).c_str());
+}
+
+static void GenerateDepluxStreamInterface(
+    grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  grpc::string main = "$ISPUBLIC$$MethodName$(";
+  grpc::string end_function =
+      "): grpc.ClientDuplexStream<$INPUT$, $OUTPUT$>;\n";
+  auto meta_data = GenerateMetaData();
+  auto options = GenerateOptions();
+  printer->Print(vars, (main + end_function).c_str());
+  printer->Print(vars, (main + options + end_function).c_str());
+  printer->Print(vars, (main + meta_data +
+                        ", options?: Partial<grpc.CallOptions>" + end_function)
+                           .c_str());
+}
+
+static void GenerateClientInterface(const grpc_generator::Service *service,
+                             grpc_generator::Printer *printer,
+                             std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars, "export interface I$ServiceName$Client {\n");
+  printer->Indent();
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["MethodName"] = method->name();
+    vars["OUTPUT"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       method->get_output_type_name(), false);
+    vars["INPUT"] = GenerateNamespace(method->get_input_namespace_parts(),
+                                      method->get_input_type_name(), false);
+    vars["ISPUBLIC"] = "";
+
+    if (method->NoStreaming()) {
+      GenerateUnaryClientInterface(printer, &vars);
+      continue;
+    }
+    if (method->BidiStreaming()) {
+      GenerateDepluxStreamInterface(printer, &vars);
+      continue;
+    }
+
+    if (method->ClientStreaming()) {
+      GenerateClientWriteStreamInterface(printer, &vars);
+      continue;
+    }
+
+    if (method->ServerStreaming()) {
+      GenerateClientReadableStreamInterface(printer, &vars);
+      continue;
+    }
+  }
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+static void GenerateClientClassInterface(
+    const grpc_generator::Service *service, grpc_generator::Printer *printer,
+    std::map<grpc::string, grpc::string> *dictonary) {
+  auto vars = *dictonary;
+  printer->Print(vars,
+                 "export class $ServiceName$Client extends grpc.Client "
+                 "implements I$ServiceName$Client {\n");
+  printer->Indent();
+  printer->Print(
+      "constructor(address: string, credentials: grpc.ChannelCredentials, "
+      "options?: object);\n");
+  for (auto it = 0; it < service->method_count(); it++) {
+    auto method = service->method(it);
+    vars["MethodName"] = method->name();
+    vars["OUTPUT"] = GenerateNamespace(method->get_output_namespace_parts(),
+                                       method->get_output_type_name(), false);
+    vars["INPUT"] = GenerateNamespace(method->get_input_namespace_parts(),
+                                      method->get_input_type_name(), false);
+    vars["ISPUBLIC"] = "public ";
+    if (method->NoStreaming()) {
+      GenerateUnaryClientInterface(printer, &vars);
+      continue;
+    }
+    if (method->BidiStreaming()) {
+      GenerateDepluxStreamInterface(printer, &vars);
+      continue;
+    }
+
+    if (method->ClientStreaming()) {
+      GenerateClientWriteStreamInterface(printer, &vars);
+      continue;
+    }
+
+    if (method->ServerStreaming()) {
+      GenerateClientReadableStreamInterface(printer, &vars);
+      continue;
+    }
+  }
+  printer->Outdent();
+  printer->Print("}\n");
+}
+} // namespace
+
+
+grpc::string GenerateInterface(grpc_generator::File *file,
+                               const grpc_generator::Service *service,
+                               const grpc::string &filename) {
+  grpc::string output;
+
+  std::set<grpc::string> generated_functions;
+  std::map<grpc::string, grpc::string> vars;
+
+  vars["PATH"] = file->package();
+
+  if (!file->package().empty()) { vars["PATH"].append("."); }
+
+  vars["ServiceName"] = service->name();
+  vars["FBSFile"] = service->name() + "_fbs";
+  vars["Filename"] = filename;
+  auto printer = file->CreatePrinter(&output);
+
+  GenerateImports(service, &*printer, &vars, false);
+  GenerateMainInterface(service, &*printer, &vars);
+  printer->Print("\n");
+  GenerateClientInterface(service, &*printer, &vars);
+  printer->Print("\n");
+  GenerateClientClassInterface(service, &*printer, &vars);
+  return output;
+}
+}  // namespace grpc_ts_generator

third_party/flatbuffers/grpc/src/compiler/ts_generator.h

@@ -0,0 +1,26 @@
+#include <memory>
+#include <set>
+#include <vector>
+
+#include "src/compiler/schema_interface.h"
+
+#ifndef GRPC_CUSTOM_STRING
+#  include <string>
+#  define GRPC_CUSTOM_STRING std::string
+#endif
+
+namespace grpc {
+
+typedef GRPC_CUSTOM_STRING string;
+
+}  // namespace grpc
+
+namespace grpc_ts_generator {
+grpc::string Generate(grpc_generator::File *file,
+                      const grpc_generator::Service *service,
+                      const grpc::string &filename);
+
+grpc::string GenerateInterface(grpc_generator::File *file,
+                               const grpc_generator::Service *service,
+                               const grpc::string &filename);
+}  // namespace grpc_ts_generator

third_party/flatbuffers/grpc/tests/BUILD

@@ -0,0 +1,17 @@
+cc_test(
+    name = "grpc_test",
+    srcs = [
+        "grpctest.cpp",
+        "message_builder_test.cpp",
+    ],
+    copts = ["-Itests"],
+    # This is required.
+    linkstatic = 1,
+    deps = [
+        "//tests:monster_test_cc_fbs",
+        "//tests:monster_test_grpc",
+        "//tests:test_assert",
+        "//tests:test_builder",
+        "@com_github_grpc_grpc//:grpc++",
+    ],
+)

third_party/flatbuffers/grpc/tests/GameFactory.java

@@ -0,0 +1,42 @@
+import java.nio.ByteBuffer;
+import MyGame.Example.Monster;
+import MyGame.Example.Stat;
+import com.google.flatbuffers.FlatBufferBuilder;
+
+class GameFactory {
+  public static Monster createMonster(String monsterName, short nestedMonsterHp, short nestedMonsterMana) {
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+
+    int name_offset = builder.createString(monsterName);
+    Monster.startMonster(builder);
+    Monster.addName(builder, name_offset);
+    Monster.addHp(builder, nestedMonsterHp);
+    Monster.addMana(builder, nestedMonsterMana);
+    int monster_offset = Monster.endMonster(builder);
+    Monster.finishMonsterBuffer(builder, monster_offset);
+
+    ByteBuffer buffer = builder.dataBuffer();
+    Monster monster = Monster.getRootAsMonster(buffer);
+    return monster;
+  }
+
+  public static Monster createMonsterFromStat(Stat stat, int seqNo) {
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+    int name_offset = builder.createString(stat.id() + " No." + seqNo);
+    Monster.startMonster(builder);
+    Monster.addName(builder, name_offset);
+    int monster_offset = Monster.endMonster(builder);
+    Monster.finishMonsterBuffer(builder, monster_offset);
+    Monster monster = Monster.getRootAsMonster(builder.dataBuffer());
+    return monster;
+  }
+
+  public static Stat createStat(String greeting, long val, int count) { 
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+    int statOffset = Stat.createStat(builder, builder.createString(greeting), val, count);
+    builder.finish(statOffset);
+    Stat stat = Stat.getRootAsStat(builder.dataBuffer());
+    return stat;
+  }
+
+}

third_party/flatbuffers/grpc/tests/JavaGrpcTest.java

@@ -0,0 +1,242 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import MyGame.Example.Monster;
+import MyGame.Example.MonsterStorageGrpc;
+import MyGame.Example.Stat;
+import com.google.flatbuffers.FlatBufferBuilder;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.Server;
+import io.grpc.ServerBuilder;
+import io.grpc.stub.StreamObserver;
+import org.junit.Assert;
+
+import java.io.IOException;
+import java.lang.InterruptedException;
+import java.nio.ByteBuffer;
+import java.util.Iterator;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.CountDownLatch;
+
+
+/**
+ * Demonstrates basic client-server interaction using grpc-java over netty.
+ */
+public class JavaGrpcTest {
+    static final String BIG_MONSTER_NAME = "Cyberdemon";
+    static final short nestedMonsterHp = 600;
+    static final short nestedMonsterMana = 1024;
+    static final int numStreamedMsgs = 10;
+    static final int timeoutMs = 3000;
+    static Server server;
+    static ManagedChannel channel;
+    static MonsterStorageGrpc.MonsterStorageBlockingStub blockingStub;
+    static MonsterStorageGrpc.MonsterStorageStub asyncStub;
+
+    static class MyService extends MonsterStorageGrpc.MonsterStorageImplBase {
+        @Override
+        public void store(Monster request, io.grpc.stub.StreamObserver<Stat> responseObserver) {
+            Assert.assertEquals(request.name(), BIG_MONSTER_NAME);
+            Assert.assertEquals(request.hp(), nestedMonsterHp);
+            Assert.assertEquals(request.mana(), nestedMonsterMana);
+            System.out.println("Received store request from " + request.name());
+            // Create a response from the incoming request name.
+            Stat stat = GameFactory.createStat("Hello " + request.name(), 100, 10);
+            responseObserver.onNext(stat);
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void retrieve(Stat request, io.grpc.stub.StreamObserver<Monster> responseObserver) {
+            // Create 10 monsters for streaming response.
+            for (int i=0; i<numStreamedMsgs; i++) {
+                Monster monster = GameFactory.createMonsterFromStat(request, i);
+                responseObserver.onNext(monster);
+            }
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public StreamObserver<Monster> getMaxHitPoint(final StreamObserver<Stat> responseObserver) {
+          return computeMinMax(responseObserver, false);
+        }
+
+        @Override
+        public StreamObserver<Monster> getMinMaxHitPoints(final StreamObserver<Stat> responseObserver) {
+          return computeMinMax(responseObserver, true);
+        }
+
+        private StreamObserver<Monster> computeMinMax(final StreamObserver<Stat> responseObserver, final boolean includeMin) {
+          final AtomicInteger maxHp = new AtomicInteger(Integer.MIN_VALUE);
+          final AtomicReference<String> maxHpMonsterName = new AtomicReference<String>();
+          final AtomicInteger maxHpCount = new AtomicInteger();
+
+          final AtomicInteger minHp = new AtomicInteger(Integer.MAX_VALUE);
+          final AtomicReference<String> minHpMonsterName = new AtomicReference<String>();
+          final AtomicInteger minHpCount = new AtomicInteger();
+
+          return new StreamObserver<Monster>() {
+            public void onNext(Monster monster) {
+              if (monster.hp() > maxHp.get()) {
+                // Found a monster of higher hit points.
+                maxHp.set(monster.hp());
+                maxHpMonsterName.set(monster.name());
+                maxHpCount.set(1);
+              }
+              else if (monster.hp() == maxHp.get()) {
+                // Count how many times we saw a monster of current max hit points.
+                maxHpCount.getAndIncrement();
+              }
+
+              if (monster.hp() < minHp.get()) {
+                // Found a monster of a lower hit points.
+                minHp.set(monster.hp());
+                minHpMonsterName.set(monster.name());
+                minHpCount.set(1);
+              }
+              else if (monster.hp() == minHp.get()) {
+                // Count how many times we saw a monster of current min hit points.
+                minHpCount.getAndIncrement();
+              }
+            }
+            public void onCompleted() {
+              Stat maxHpStat = GameFactory.createStat(maxHpMonsterName.get(), maxHp.get(), maxHpCount.get());
+              // Send max hit points first.
+              responseObserver.onNext(maxHpStat);
+              if (includeMin) {
+                // Send min hit points.
+                Stat minHpStat = GameFactory.createStat(minHpMonsterName.get(), minHp.get(), minHpCount.get());
+                responseObserver.onNext(minHpStat);
+              }
+              responseObserver.onCompleted();
+            }
+            public void onError(Throwable t) {
+              // Not expected
+              Assert.fail();
+            };
+          };
+        }
+    }
+
+    @org.junit.BeforeClass
+    public static void startServer() throws IOException {
+        server = ServerBuilder.forPort(0).addService(new MyService()).build().start();
+        int port = server.getPort();
+        channel = ManagedChannelBuilder.forAddress("localhost", port)
+                // Channels are secure by default (via SSL/TLS). For the example we disable TLS to avoid
+                // needing certificates.
+                .usePlaintext()
+                .directExecutor()
+                .build();
+        blockingStub = MonsterStorageGrpc.newBlockingStub(channel);
+        asyncStub = MonsterStorageGrpc.newStub(channel);
+    }
+
+    @org.junit.Test
+    public void testUnary() throws IOException {
+        Monster monsterRequest = GameFactory.createMonster(BIG_MONSTER_NAME, nestedMonsterHp, nestedMonsterMana);
+        Stat stat = blockingStub.store(monsterRequest);
+        Assert.assertEquals(stat.id(), "Hello " + BIG_MONSTER_NAME);
+        System.out.println("Received stat response from service: " + stat.id());
+    }
+
+    @org.junit.Test
+    public void testServerStreaming() throws IOException {
+        Monster monsterRequest = GameFactory.createMonster(BIG_MONSTER_NAME, nestedMonsterHp, nestedMonsterMana);
+        Stat stat = blockingStub.store(monsterRequest);
+        Iterator<Monster> iterator = blockingStub.retrieve(stat);
+        int counter = 0;
+        while(iterator.hasNext()) {
+            Monster m = iterator.next();
+            System.out.println("Received monster " + m.name());
+            counter ++;
+        }
+        Assert.assertEquals(counter, numStreamedMsgs);
+        System.out.println("FlatBuffers GRPC client/server test: completed successfully");
+    }
+
+    @org.junit.Test
+    public void testClientStreaming() throws IOException, InterruptedException {
+      final AtomicReference<Stat> maxHitStat = new AtomicReference<Stat>();
+      final CountDownLatch streamAlive = new CountDownLatch(1);
+
+      StreamObserver<Stat> statObserver = new StreamObserver<Stat>() {
+        public void onCompleted() {
+          streamAlive.countDown();
+        }
+        public void onError(Throwable ex) { }
+        public void onNext(Stat stat) {
+          maxHitStat.set(stat);
+        }
+      };
+      StreamObserver<Monster> monsterStream = asyncStub.getMaxHitPoint(statObserver);
+      short count = 10;
+      for (short i = 0;i < count; ++i) {
+        Monster monster = GameFactory.createMonster(BIG_MONSTER_NAME + i, (short) (nestedMonsterHp * i), nestedMonsterMana);
+        monsterStream.onNext(monster);
+      }
+      monsterStream.onCompleted();
+      // Wait a little bit for the server to send the stats of the monster with the max hit-points.
+      streamAlive.await(timeoutMs, TimeUnit.MILLISECONDS);
+      Assert.assertEquals(maxHitStat.get().id(), BIG_MONSTER_NAME + (count - 1));
+      Assert.assertEquals(maxHitStat.get().val(), nestedMonsterHp * (count - 1));
+      Assert.assertEquals(maxHitStat.get().count(), 1);
+    }
+
+    @org.junit.Test
+    public void testBiDiStreaming() throws IOException, InterruptedException {
+      final AtomicReference<Stat> maxHitStat = new AtomicReference<Stat>();
+      final AtomicReference<Stat> minHitStat = new AtomicReference<Stat>();
+      final CountDownLatch streamAlive = new CountDownLatch(1);
+
+      StreamObserver<Stat> statObserver = new StreamObserver<Stat>() {
+        public void onCompleted() {
+          streamAlive.countDown();
+        }
+        public void onError(Throwable ex) { }
+        public void onNext(Stat stat) {
+          // We expect the server to send the max stat first and then the min stat.
+          if (maxHitStat.get() == null) {
+            maxHitStat.set(stat);
+          }
+          else {
+            minHitStat.set(stat);
+          }
+        }
+      };
+      StreamObserver<Monster> monsterStream = asyncStub.getMinMaxHitPoints(statObserver);
+      short count = 10;
+      for (short i = 0;i < count; ++i) {
+        Monster monster = GameFactory.createMonster(BIG_MONSTER_NAME + i, (short) (nestedMonsterHp * i), nestedMonsterMana);
+        monsterStream.onNext(monster);
+      }
+      monsterStream.onCompleted();
+
+      // Wait a little bit for the server to send the stats of the monster with the max and min hit-points.
+      streamAlive.await(timeoutMs, TimeUnit.MILLISECONDS);
+
+      Assert.assertEquals(maxHitStat.get().id(), BIG_MONSTER_NAME + (count - 1));
+      Assert.assertEquals(maxHitStat.get().val(), nestedMonsterHp * (count - 1));
+      Assert.assertEquals(maxHitStat.get().count(), 1);
+
+      Assert.assertEquals(minHitStat.get().id(), BIG_MONSTER_NAME + 0);
+      Assert.assertEquals(minHitStat.get().val(), nestedMonsterHp * 0);
+      Assert.assertEquals(minHitStat.get().count(), 1);
+    }
+}

third_party/flatbuffers/grpc/tests/go_test.go

@@ -0,0 +1,102 @@
+package testing
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+	"github.com/google/flatbuffers/tests/MyGame/Example"
+
+	"context"
+	"net"
+	"testing"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/encoding"
+)
+
+type server struct {
+	Example.UnimplementedMonsterStorageServer
+}
+
+// test used to send and receive in grpc methods
+var test = "Flatbuffers"
+var addr = "0.0.0.0:50051"
+
+// gRPC server store method
+func (s *server) Store(context context.Context, in *Example.Monster) (*flatbuffers.Builder, error) {
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(test)
+	Example.StatStart(b)
+	Example.StatAddId(b, i)
+	b.Finish(Example.StatEnd(b))
+	return b, nil
+
+}
+
+// gRPC server retrieve method
+func (s *server) Retrieve(context context.Context, in *Example.Stat) (*flatbuffers.Builder, error) {
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(test)
+	Example.MonsterStart(b)
+	Example.MonsterAddName(b, i)
+	b.Finish(Example.MonsterEnd(b))
+	return b, nil
+}
+
+func StoreClient(c Example.MonsterStorageClient, t *testing.T) {
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(test)
+	Example.MonsterStart(b)
+	Example.MonsterAddName(b, i)
+	b.Finish(Example.MonsterEnd(b))
+	out, err := c.Store(context.Background(), b)
+	if err != nil {
+		t.Fatalf("Store client failed: %v", err)
+	}
+	if string(out.Id()) != test {
+		t.Errorf("StoreClient failed: expected=%s, got=%s\n", test, out.Id())
+		t.Fail()
+	}
+}
+
+func RetrieveClient(c Example.MonsterStorageClient, t *testing.T) {
+	b := flatbuffers.NewBuilder(0)
+	i := b.CreateString(test)
+	Example.StatStart(b)
+	Example.StatAddId(b, i)
+	b.Finish(Example.StatEnd(b))
+	out, err := c.Retrieve(context.Background(), b)
+	if err != nil {
+		t.Fatalf("Retrieve client failed: %v", err)
+	}
+	monster, err := out.Recv()
+	if err != nil {
+		t.Fatalf("Recv failed: %v", err)
+	}
+	if string(monster.Name()) != test {
+		t.Errorf("RetrieveClient failed: expected=%s, got=%s\n", test, monster.Name())
+		t.Fail()
+	}
+}
+
+func TestGRPC(t *testing.T) {
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		t.Fatalf("Failed to listen: %v", err)
+	}
+	ser := grpc.NewServer()
+	encoding.RegisterCodec(flatbuffers.FlatbuffersCodec{})
+	Example.RegisterMonsterStorageServer(ser, &server{})
+	go func() {
+		if err := ser.Serve(lis); err != nil {
+			t.Fatalf("Failed to serve: %v", err)
+			t.FailNow()
+		}
+	}()
+	conn, err := grpc.Dial(addr, grpc.WithInsecure(), grpc.WithCodec(flatbuffers.FlatbuffersCodec{}))
+	if err != nil {
+		t.Fatalf("Failed to connect: %v", err)
+	}
+	defer conn.Close()
+	client := Example.NewMonsterStorageClient(conn)
+	StoreClient(client, t)
+	RetrieveClient(client, t)
+}

third_party/flatbuffers/grpc/tests/grpctest.cpp

@@ -0,0 +1,193 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <grpcpp/grpcpp.h>
+
+#include <condition_variable>
+#include <thread>
+
+#include "monster_test.grpc.fb.h"
+#include "monster_test_generated.h"
+#include "test_assert.h"
+
+using namespace MyGame::Example;
+using flatbuffers::FlatBufferBuilder;
+using flatbuffers::grpc::MessageBuilder;
+
+void message_builder_tests();
+
+// The callback implementation of our server, that derives from the generated
+// code. It implements all rpcs specified in the FlatBuffers schema.
+class ServiceImpl final : public MyGame::Example::MonsterStorage::Service {
+  virtual ::grpc::Status Store(
+      ::grpc::ServerContext *context,
+      const flatbuffers::grpc::Message<Monster> *request,
+      flatbuffers::grpc::Message<Stat> *response) override {
+    // Create a response from the incoming request name.
+    fbb_.Clear();
+    auto stat_offset = CreateStat(
+        fbb_, fbb_.CreateString("Hello, " + request->GetRoot()->name()->str()));
+    fbb_.Finish(stat_offset);
+    // Transfer ownership of the message to gRPC
+    *response = fbb_.ReleaseMessage<Stat>();
+    return grpc::Status::OK;
+  }
+  virtual ::grpc::Status Retrieve(
+      ::grpc::ServerContext *context,
+      const flatbuffers::grpc::Message<Stat> *request,
+      ::grpc::ServerWriter<flatbuffers::grpc::Message<Monster>> *writer)
+      override {
+    for (int i = 0; i < 5; i++) {
+      fbb_.Clear();
+      // Create 5 monsters for resposne.
+      auto monster_offset =
+          CreateMonster(fbb_, 0, 0, 0,
+                        fbb_.CreateString(request->GetRoot()->id()->str() +
+                                          " No." + std::to_string(i)));
+      fbb_.Finish(monster_offset);
+
+      flatbuffers::grpc::Message<Monster> monster =
+          fbb_.ReleaseMessage<Monster>();
+
+      // Send monster to client using streaming.
+      writer->Write(monster);
+    }
+    return grpc::Status::OK;
+  }
+
+ private:
+  flatbuffers::grpc::MessageBuilder fbb_;
+};
+
+// Track the server instance, so we can terminate it later.
+grpc::Server *server_instance = nullptr;
+// Mutex to protec this variable.
+std::mutex wait_for_server;
+std::condition_variable server_instance_cv;
+
+// This function implements the server thread.
+void RunServer() {
+  auto server_address = "0.0.0.0:50051";
+  // Callback interface we implemented above.
+  ServiceImpl service;
+  grpc::ServerBuilder builder;
+  builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
+  builder.RegisterService(&service);
+
+  // Start the server. Lock to change the variable we're changing.
+  wait_for_server.lock();
+  server_instance = builder.BuildAndStart().release();
+  wait_for_server.unlock();
+  server_instance_cv.notify_one();
+
+  std::cout << "Server listening on " << server_address << std::endl;
+  // This will block the thread and serve requests.
+  server_instance->Wait();
+}
+
+template<class Builder> void StoreRPC(MonsterStorage::Stub *stub) {
+  Builder fbb;
+  grpc::ClientContext context;
+  // Build a request with the name set.
+  auto monster_offset = CreateMonster(fbb, 0, 0, 0, fbb.CreateString("Fred"));
+  MessageBuilder mb(std::move(fbb));
+  mb.Finish(monster_offset);
+  auto request = mb.ReleaseMessage<Monster>();
+  flatbuffers::grpc::Message<Stat> response;
+
+  // The actual RPC.
+  auto status = stub->Store(&context, request, &response);
+
+  if (status.ok()) {
+    auto resp = response.GetRoot()->id();
+    std::cout << "RPC response: " << resp->str() << std::endl;
+  } else {
+    std::cout << "RPC failed" << std::endl;
+  }
+}
+
+template<class Builder> void RetrieveRPC(MonsterStorage::Stub *stub) {
+  Builder fbb;
+  grpc::ClientContext context;
+  fbb.Clear();
+  auto stat_offset = CreateStat(fbb, fbb.CreateString("Fred"));
+  fbb.Finish(stat_offset);
+  auto request = MessageBuilder(std::move(fbb)).ReleaseMessage<Stat>();
+
+  flatbuffers::grpc::Message<Monster> response;
+  auto stream = stub->Retrieve(&context, request);
+  while (stream->Read(&response)) {
+    auto resp = response.GetRoot()->name();
+    std::cout << "RPC Streaming response: " << resp->str() << std::endl;
+  }
+}
+
+int grpc_server_test() {
+  // Launch server.
+  std::thread server_thread(RunServer);
+
+  // wait for server to spin up.
+  std::unique_lock<std::mutex> lock(wait_for_server);
+  while (!server_instance) server_instance_cv.wait(lock);
+
+  // Now connect the client.
+  auto channel = grpc::CreateChannel("localhost:50051",
+                                     grpc::InsecureChannelCredentials());
+  auto stub = MyGame::Example::MonsterStorage::NewStub(channel);
+
+  StoreRPC<MessageBuilder>(stub.get());
+  StoreRPC<FlatBufferBuilder>(stub.get());
+
+  RetrieveRPC<MessageBuilder>(stub.get());
+  RetrieveRPC<FlatBufferBuilder>(stub.get());
+
+#if !FLATBUFFERS_GRPC_DISABLE_AUTO_VERIFICATION
+  {
+    // Test that an invalid request errors out correctly
+    grpc::ClientContext context;
+    flatbuffers::grpc::Message<Monster> request;  // simulate invalid message
+    flatbuffers::grpc::Message<Stat> response;
+    auto status = stub->Store(&context, request, &response);
+    // The rpc status should be INTERNAL to indicate a verification error. This
+    // matches the protobuf gRPC status code for an unparseable message.
+    assert(!status.ok());
+    assert(status.error_code() == ::grpc::StatusCode::INTERNAL);
+    assert(strcmp(status.error_message().c_str(),
+                  "Message verification failed") == 0);
+  }
+#endif
+
+  server_instance->Shutdown();
+
+  server_thread.join();
+
+  delete server_instance;
+
+  return 0;
+}
+
+int main(int /*argc*/, const char * /*argv*/[]) {
+  message_builder_tests();
+  grpc_server_test();
+
+  if (!testing_fails) {
+    TEST_OUTPUT_LINE("ALL TESTS PASSED");
+    return 0;
+  } else {
+    TEST_OUTPUT_LINE("%d FAILED TESTS", testing_fails);
+    return 1;
+  }
+}

third_party/flatbuffers/grpc/tests/grpctest.py

@@ -0,0 +1,174 @@
+from __future__ import print_function
+
+import os
+import sys
+import grpc
+import flatbuffers
+
+from concurrent import futures
+
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'tests'))
+import MyGame.Example.Monster as Monster
+import MyGame.Example.Stat as Stat
+import MyGame.Example.Vec3 as Vec3
+import MyGame.Example.Test as Test
+import MyGame.Example.monster_test_grpc_fb as monster_grpc_fb
+
+
+test_stat_id = "test_stat_id"
+test_stat_val = 8
+test_stat_count = 1
+
+test_monster_name1 = "test_monster_name1"
+test_monster_name2 = "test_monster_name2"
+test_string = "test_string"
+test_color = 2
+test_X = 3.0
+test_Y = 2.0
+test_Z = 6.0
+test_test1 = 4.0
+test_a = 8
+test_b = 5
+test_hp = 67
+test_inventory = [1, 1, 2, 3, 5, 8]
+test_testtype = 4
+
+test_monsters_name_retrieve = ["big_monster", "small_monster"]
+test_no_of_monsters = 2
+
+
+class MonsterStorage(monster_grpc_fb.MonsterStorageServicer):
+
+    def Store(self, request, context):
+
+        m = Monster.Monster().GetRootAsMonster(request, 0)
+
+        assert m.Name().decode("utf-8") == test_monster_name1
+
+        assert m.Pos().X() == test_X
+        assert m.Pos().Y() == test_Y
+        assert m.Pos().Z() == test_Z
+        assert m.Pos().Test1() == test_test1
+        assert m.Pos().Test2() == test_color
+        test3 = Test.Test()
+        assert m.Pos().Test3(test3).A() == test_a
+        assert m.Pos().Test3(test3).B() == test_b
+
+        assert m.Hp() == test_hp
+
+        assert m.Color() == test_color
+
+        assert m.InventoryLength() == len(test_inventory)
+        for i in range(0, len(test_inventory)):
+            assert m.Inventory(i) == test_inventory[len(test_inventory)-i -1]
+
+        assert m.TestType() == test_testtype
+
+        assert m.Test() is not None
+        table = m.Test()
+
+        m2 = Monster.Monster()
+        m2.Init(table.Bytes, table.Pos)
+        assert m2.Name().decode("utf-8") == test_monster_name2
+
+        m3 = m.Enemy()
+        assert m3.Name().decode("utf-8") == test_monster_name2
+
+        assert m.Testarrayofstring(0).decode("utf-8") == test_string
+
+        b = flatbuffers.Builder(0)
+        i = b.CreateString(test_stat_id)
+        Stat.StatStart(b)
+        Stat.StatAddId(b, i)
+        Stat.StatAddVal(b, test_stat_val)
+        Stat.StatAddCount(b, test_stat_count)
+        b.Finish(Stat.StatEnd(b))
+        return bytes(b.Output())
+
+    def Retrieve(self, request, context):
+
+        s = Stat.Stat().GetRootAsStat(request, 0)
+
+        no_of_monsters = test_no_of_monsters
+        for i in range(0, no_of_monsters):
+            b = flatbuffers.Builder(0)
+            i = b.CreateString(test_monsters_name_retrieve[i])
+            Monster.MonsterStart(b)
+            Monster.MonsterAddName(b, i)
+            b.Finish(Monster.MonsterEnd(b))
+            yield bytes(b.Output())
+
+
+def serve():
+
+    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
+    monster_grpc_fb.add_MonsterStorageServicer_to_server(MonsterStorage(), server)
+    server.add_insecure_port('[::]:50051')
+
+    server.start()
+
+    run()
+
+
+def run():
+
+    channel = grpc.insecure_channel('127.0.0.1:50051')
+    stub = monster_grpc_fb.MonsterStorageStub(channel)
+
+    b = flatbuffers.Builder(0)
+    name2 = b.CreateString(test_monster_name2)
+    name1 = b.CreateString(test_monster_name1)
+    Monster.MonsterStart(b)
+    Monster.MonsterAddName(b, name2)
+    monster2 = Monster.MonsterEnd(b)
+    test1 = b.CreateString(test_string)
+
+    Monster.MonsterStartInventoryVector(b, len(test_inventory))
+    for i in range(0, len(test_inventory)):
+        b.PrependByte(test_inventory[i])
+    inv = b.EndVector()
+
+    Monster.MonsterStartTest4Vector(b, 2)
+    Test.CreateTest(b, 10, 20)
+    Test.CreateTest(b, 30, 40)
+    test4 = b.EndVector()
+
+    Monster.MonsterStartTestarrayofstringVector(b, 1)
+    b.PrependUOffsetTRelative(test1)
+    test_array_of_string = b.EndVector()
+
+    Monster.MonsterStart(b)
+
+    Monster.MonsterAddHp(b, test_hp)
+    Monster.MonsterAddName(b, name1)
+    Monster.MonsterAddColor(b, test_color)
+    pos = Vec3.CreateVec3(b, test_X, test_Y, test_Z, test_test1, test_color, test_a, test_b)
+    Monster.MonsterAddPos(b, pos)
+    Monster.MonsterAddInventory(b, inv)
+    Monster.MonsterAddTestType(b, test_testtype)
+    Monster.MonsterAddTest(b, monster2)
+    Monster.MonsterAddTest4(b, test4)
+    Monster.MonsterAddEnemy(b, monster2)
+    Monster.MonsterAddTestarrayofstring(b, test_array_of_string)
+    monster = Monster.MonsterEnd(b)
+
+    b.Finish(monster)
+
+    stat_response = stub.Store(bytes(b.Output()))
+
+    s = Stat.Stat().GetRootAsStat(stat_response, 0)
+
+    assert s.Id().decode("utf-8") == test_stat_id
+    assert s.Val() == test_stat_val
+    assert s.Count() == test_stat_count
+
+    monster_reponses = stub.Retrieve(stat_response)
+    count = 0
+    for monster_reponse in monster_reponses:
+        m = Monster.Monster().GetRootAsMonster(monster_reponse, 0)
+        assert m.Name().decode("utf-8") == test_monsters_name_retrieve[count]
+        count = count + 1
+
+
+if __name__ == '__main__':
+    serve()

third_party/flatbuffers/grpc/tests/java-grpc-test.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# NOTE: make sure `mvn install` in /gprc is executed before running this test
+mvn test

third_party/flatbuffers/grpc/tests/message_builder_test.cpp

@@ -0,0 +1,368 @@
+#include "flatbuffers/grpc.h"
+#include "monster_test_generated.h"
+#include "test_assert.h"
+#include "test_builder.h"
+
+using MyGame::Example::Any_NONE;
+using MyGame::Example::CreateStat;
+using MyGame::Example::Vec3;
+
+bool verify(flatbuffers::grpc::Message<Monster> &msg,
+            const std::string &expected_name, Color expected_color) {
+  const Monster *monster = msg.GetRoot();
+  const auto name = monster->name()->str();
+  const auto color = monster->color();
+  TEST_EQ(name, expected_name);
+  TEST_EQ(color, expected_color);
+  return (name == expected_name) && (color == expected_color);
+}
+
+bool release_n_verify(flatbuffers::grpc::MessageBuilder &mbb,
+                      const std::string &expected_name, Color expected_color) {
+  flatbuffers::grpc::Message<Monster> msg = mbb.ReleaseMessage<Monster>();
+  return verify(msg, expected_name, expected_color);
+}
+
+void builder_move_assign_after_releaseraw_test(
+    flatbuffers::grpc::MessageBuilder dst) {
+  auto root_offset1 = populate1(dst);
+  dst.Finish(root_offset1);
+  size_t size, offset;
+  ::grpc::Slice slice;
+  dst.ReleaseRaw(size, offset, slice);
+  flatbuffers::FlatBufferBuilder src;
+  auto root_offset2 = populate2(src);
+  src.Finish(root_offset2);
+  auto src_size = src.GetSize();
+  // Move into a released builder.
+  dst = std::move(src);
+  TEST_EQ(dst.GetSize(), src_size);
+  TEST_ASSERT(release_n_verify(dst, m2_name(), m2_color()));
+  TEST_EQ(src.GetSize(), 0);
+}
+
+template<class SrcBuilder>
+struct BuilderReuseTests<flatbuffers::grpc::MessageBuilder, SrcBuilder> {
+  static void builder_reusable_after_release_message_test(
+      TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE_MESSAGE)) { return; }
+
+    flatbuffers::grpc::MessageBuilder mb;
+    std::vector<flatbuffers::grpc::Message<Monster>> buffers;
+    for (int i = 0; i < 5; ++i) {
+      auto root_offset1 = populate1(mb);
+      mb.Finish(root_offset1);
+      buffers.push_back(mb.ReleaseMessage<Monster>());
+      TEST_ASSERT_FUNC(verify(buffers[i], m1_name(), m1_color()));
+    }
+  }
+
+  static void builder_reusable_after_release_test(TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE)) { return; }
+
+    // FIXME: Populate-Release loop fails assert(GRPC_SLICE_IS_EMPTY(slice_)) in
+    // SliceAllocator::allocate in the second iteration.
+
+    flatbuffers::grpc::MessageBuilder mb;
+    std::vector<flatbuffers::DetachedBuffer> buffers;
+    for (int i = 0; i < 2; ++i) {
+      auto root_offset1 = populate1(mb);
+      mb.Finish(root_offset1);
+      buffers.push_back(mb.Release());
+      TEST_ASSERT_FUNC(verify(buffers[i], m1_name(), m1_color()));
+    }
+  }
+
+  static void builder_reusable_after_releaseraw_test(TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE_RAW)) { return; }
+
+    flatbuffers::grpc::MessageBuilder mb;
+    for (int i = 0; i < 5; ++i) {
+      auto root_offset1 = populate1(mb);
+      mb.Finish(root_offset1);
+      size_t size, offset;
+      ::grpc::Slice slice;
+      const uint8_t *buf = mb.ReleaseRaw(size, offset, slice);
+      TEST_ASSERT_FUNC(verify(buf, offset, m1_name(), m1_color()));
+    }
+  }
+
+  static void builder_reusable_after_release_and_move_assign_test(
+      TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE_AND_MOVE_ASSIGN)) { return; }
+
+    // FIXME: Release-move_assign loop fails assert(p ==
+    // GRPC_SLICE_START_PTR(slice_)) in DetachedBuffer destructor after all the
+    // iterations
+
+    flatbuffers::grpc::MessageBuilder dst;
+    std::vector<flatbuffers::DetachedBuffer> buffers;
+
+    for (int i = 0; i < 2; ++i) {
+      auto root_offset1 = populate1(dst);
+      dst.Finish(root_offset1);
+      buffers.push_back(dst.Release());
+      TEST_ASSERT_FUNC(verify(buffers[i], m1_name(), m1_color()));
+
+      // bring dst back to life.
+      SrcBuilder src;
+      dst = std::move(src);
+      TEST_EQ_FUNC(dst.GetSize(), 0);
+      TEST_EQ_FUNC(src.GetSize(), 0);
+    }
+  }
+
+  static void builder_reusable_after_release_message_and_move_assign_test(
+      TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE_MESSAGE_AND_MOVE_ASSIGN)) {
+      return;
+    }
+
+    flatbuffers::grpc::MessageBuilder dst;
+    std::vector<flatbuffers::grpc::Message<Monster>> buffers;
+
+    for (int i = 0; i < 5; ++i) {
+      auto root_offset1 = populate1(dst);
+      dst.Finish(root_offset1);
+      buffers.push_back(dst.ReleaseMessage<Monster>());
+      TEST_ASSERT_FUNC(verify(buffers[i], m1_name(), m1_color()));
+
+      // bring dst back to life.
+      SrcBuilder src;
+      dst = std::move(src);
+      TEST_EQ_FUNC(dst.GetSize(), 0);
+      TEST_EQ_FUNC(src.GetSize(), 0);
+    }
+  }
+
+  static void builder_reusable_after_releaseraw_and_move_assign_test(
+      TestSelector selector) {
+    if (!selector.count(REUSABLE_AFTER_RELEASE_RAW_AND_MOVE_ASSIGN)) { return; }
+
+    flatbuffers::grpc::MessageBuilder dst;
+    for (int i = 0; i < 5; ++i) {
+      auto root_offset1 = populate1(dst);
+      dst.Finish(root_offset1);
+      size_t size, offset;
+      ::grpc::Slice slice;
+      const uint8_t *buf = dst.ReleaseRaw(size, offset, slice);
+      TEST_ASSERT_FUNC(verify(buf, offset, m1_name(), m1_color()));
+
+      SrcBuilder src;
+      dst = std::move(src);
+      TEST_EQ_FUNC(dst.GetSize(), 0);
+      TEST_EQ_FUNC(src.GetSize(), 0);
+    }
+  }
+
+  static void run_tests(TestSelector selector) {
+    builder_reusable_after_release_test(selector);
+    builder_reusable_after_release_message_test(selector);
+    builder_reusable_after_releaseraw_test(selector);
+    builder_reusable_after_release_and_move_assign_test(selector);
+    builder_reusable_after_releaseraw_and_move_assign_test(selector);
+    builder_reusable_after_release_message_and_move_assign_test(selector);
+  }
+};
+
+void slice_allocator_tests() {
+  // move-construct no-delete test
+  {
+    size_t size = 2048;
+    flatbuffers::grpc::SliceAllocator sa1;
+    uint8_t *buf = sa1.allocate(size);
+    TEST_ASSERT_FUNC(buf != 0);
+    buf[0] = 100;
+    buf[size - 1] = 200;
+    flatbuffers::grpc::SliceAllocator sa2(std::move(sa1));
+    // buf should not be deleted after move-construct
+    TEST_EQ_FUNC(buf[0], 100);
+    TEST_EQ_FUNC(buf[size - 1], 200);
+    // buf is freed here
+  }
+
+  // move-assign test
+  {
+    flatbuffers::grpc::SliceAllocator sa1, sa2;
+    uint8_t *buf = sa1.allocate(2048);
+    sa1 = std::move(sa2);
+    // sa1 deletes previously allocated memory in move-assign.
+    // So buf is no longer usable here.
+    TEST_ASSERT_FUNC(buf != 0);
+  }
+}
+
+/// This function does not populate exactly the first half of the table. But it
+/// could.
+void populate_first_half(MyGame::Example::MonsterBuilder &wrapper,
+                         flatbuffers::Offset<flatbuffers::String> name_offset) {
+  wrapper.add_name(name_offset);
+  wrapper.add_color(m1_color());
+}
+
+/// This function does not populate exactly the second half of the table. But it
+/// could.
+void populate_second_half(MyGame::Example::MonsterBuilder &wrapper) {
+  wrapper.add_hp(77);
+  wrapper.add_mana(88);
+  Vec3 vec3;
+  wrapper.add_pos(&vec3);
+}
+
+/// This function is a hack to update the FlatBufferBuilder reference (fbb_) in
+/// the MonsterBuilder object. This function will break if fbb_ is not the first
+/// member in MonsterBuilder. In that case, some offset must be added. This
+/// function is used exclusively for testing correctness of move operations
+/// between FlatBufferBuilders. If MonsterBuilder had a fbb_ pointer, this hack
+/// would be unnecessary. That involves a code-generator change though.
+void test_only_hack_update_fbb_reference(
+    MyGame::Example::MonsterBuilder &monsterBuilder,
+    flatbuffers::grpc::MessageBuilder &mb) {
+  *reinterpret_cast<flatbuffers::FlatBufferBuilder **>(&monsterBuilder) = &mb;
+}
+
+/// This test validates correctness of move conversion of FlatBufferBuilder to a
+/// MessageBuilder DURING a table construction. Half of the table is constructed
+/// using FlatBufferBuilder and the other half of the table is constructed using
+/// a MessageBuilder.
+void builder_move_ctor_conversion_before_finish_half_n_half_table_test() {
+  for (size_t initial_size = 4; initial_size <= 2048; initial_size *= 2) {
+    flatbuffers::FlatBufferBuilder fbb(initial_size);
+    auto name_offset = fbb.CreateString(m1_name());
+    MyGame::Example::MonsterBuilder monsterBuilder(
+        fbb);  // starts a table in FlatBufferBuilder
+    populate_first_half(monsterBuilder, name_offset);
+    flatbuffers::grpc::MessageBuilder mb(std::move(fbb));
+    test_only_hack_update_fbb_reference(monsterBuilder, mb);  // hack
+    populate_second_half(monsterBuilder);
+    mb.Finish(monsterBuilder.Finish());  // ends the table in MessageBuilder
+    TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+    TEST_EQ_FUNC(fbb.GetSize(), 0);
+  }
+}
+
+/// This test populates a COMPLETE inner table before move conversion and later
+/// populates more members in the outer table.
+void builder_move_ctor_conversion_before_finish_test() {
+  for (size_t initial_size = 1; initial_size <= 2048; initial_size += 1) {
+    flatbuffers::FlatBufferBuilder fbb(initial_size);
+    auto stat_offset = CreateStat(fbb, fbb.CreateString("SomeId"), 0, 0);
+    flatbuffers::grpc::MessageBuilder mb(std::move(fbb));
+    auto monster_offset =
+        CreateMonster(mb, 0, 150, 100, mb.CreateString(m1_name()), 0,
+                      m1_color(), Any_NONE, 0, 0, 0, 0, 0, 0, stat_offset);
+    mb.Finish(monster_offset);
+    {
+      auto mon = flatbuffers::GetRoot<Monster>(mb.GetBufferPointer());
+      TEST_NOTNULL(mon);
+      TEST_NOTNULL(mon->name());
+      TEST_EQ_STR(mon->name()->c_str(), m1_name().c_str());
+      TEST_EQ(mon->color(), m1_color());
+    }
+    TEST_EQ(1, MyGame::Example::Color_Red);
+    TEST_EQ(1, m1_color());
+    TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+    TEST_EQ_FUNC(fbb.GetSize(), 0);
+  }
+}
+
+/// This test validates correctness of move conversion of FlatBufferBuilder to a
+/// MessageBuilder DURING a table construction. Half of the table is constructed
+/// using FlatBufferBuilder and the other half of the table is constructed using
+/// a MessageBuilder.
+void builder_move_assign_conversion_before_finish_half_n_half_table_test() {
+  flatbuffers::FlatBufferBuilder fbb;
+  flatbuffers::grpc::MessageBuilder mb;
+
+  for (int i = 0; i < 5; ++i) {
+    flatbuffers::FlatBufferBuilder fbb;
+    auto name_offset = fbb.CreateString(m1_name());
+    MyGame::Example::MonsterBuilder monsterBuilder(
+        fbb);  // starts a table in FlatBufferBuilder
+    populate_first_half(monsterBuilder, name_offset);
+    mb = std::move(fbb);
+    test_only_hack_update_fbb_reference(monsterBuilder, mb);  // hack
+    populate_second_half(monsterBuilder);
+    mb.Finish(monsterBuilder.Finish());  // ends the table in MessageBuilder
+    TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+    TEST_EQ_FUNC(fbb.GetSize(), 0);
+  }
+}
+
+/// This test populates a COMPLETE inner table before move conversion and later
+/// populates more members in the outer table.
+void builder_move_assign_conversion_before_finish_test() {
+  flatbuffers::FlatBufferBuilder fbb;
+  flatbuffers::grpc::MessageBuilder mb;
+
+  for (int i = 0; i < 5; ++i) {
+    auto stat_offset = CreateStat(fbb, fbb.CreateString("SomeId"), 0, 0);
+    mb = std::move(fbb);
+    auto monster_offset =
+        CreateMonster(mb, 0, 150, 100, mb.CreateString(m1_name()), 0,
+                      m1_color(), Any_NONE, 0, 0, 0, 0, 0, 0, stat_offset);
+    mb.Finish(monster_offset);
+    TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+    TEST_EQ_FUNC(fbb.GetSize(), 0);
+  }
+}
+
+/// This test populates data, finishes the buffer, and does move conversion
+/// after.
+void builder_move_ctor_conversion_after_finish_test() {
+  flatbuffers::FlatBufferBuilder fbb;
+  fbb.Finish(populate1(fbb));
+  flatbuffers::grpc::MessageBuilder mb(std::move(fbb));
+  TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+  TEST_EQ_FUNC(fbb.GetSize(), 0);
+}
+
+/// This test populates data, finishes the buffer, and does move conversion
+/// after.
+void builder_move_assign_conversion_after_finish_test() {
+  flatbuffers::FlatBufferBuilder fbb;
+  flatbuffers::grpc::MessageBuilder mb;
+
+  for (int i = 0; i < 5; ++i) {
+    fbb.Finish(populate1(fbb));
+    mb = std::move(fbb);
+    TEST_ASSERT_FUNC(release_n_verify(mb, m1_name(), m1_color()));
+    TEST_EQ_FUNC(fbb.GetSize(), 0);
+  }
+}
+
+void message_builder_tests() {
+  using flatbuffers::FlatBufferBuilder;
+  using flatbuffers::grpc::MessageBuilder;
+
+  slice_allocator_tests();
+
+#ifndef __APPLE__
+  builder_move_ctor_conversion_before_finish_half_n_half_table_test();
+  builder_move_assign_conversion_before_finish_half_n_half_table_test();
+#endif  // __APPLE__
+  builder_move_ctor_conversion_before_finish_test();
+  builder_move_assign_conversion_before_finish_test();
+
+  builder_move_ctor_conversion_after_finish_test();
+  builder_move_assign_conversion_after_finish_test();
+
+  BuilderTests<MessageBuilder, MessageBuilder>::all_tests();
+  BuilderTests<MessageBuilder, FlatBufferBuilder>::all_tests();
+
+  BuilderReuseTestSelector tests[6] = {
+    // REUSABLE_AFTER_RELEASE,                 // Assertion failed:
+    // (GRPC_SLICE_IS_EMPTY(slice_))
+    // REUSABLE_AFTER_RELEASE_AND_MOVE_ASSIGN, // Assertion failed: (p ==
+    // GRPC_SLICE_START_PTR(slice_)
+
+    REUSABLE_AFTER_RELEASE_RAW, REUSABLE_AFTER_RELEASE_MESSAGE,
+    REUSABLE_AFTER_RELEASE_MESSAGE_AND_MOVE_ASSIGN,
+    REUSABLE_AFTER_RELEASE_RAW_AND_MOVE_ASSIGN
+  };
+
+  BuilderReuseTests<MessageBuilder, MessageBuilder>::run_tests(
+      TestSelector(tests, tests + 6));
+  BuilderReuseTests<MessageBuilder, FlatBufferBuilder>::run_tests(
+      TestSelector(tests, tests + 6));
+}

third_party/flatbuffers/grpc/tests/pom.xml

@@ -0,0 +1,73 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.google.flatbuffers</groupId>
+        <artifactId>flatbuffers-parent</artifactId>
+        <version>2.0.3</version>
+    </parent>
+    <artifactId>grpc-test</artifactId>
+    <description>Example/Test project demonstrating usage of flatbuffers with GRPC-Java instead of protobufs
+    </description>
+    <properties>
+        <gRPC.version>2.0.3</gRPC.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.flatbuffers</groupId>
+            <artifactId>flatbuffers-java</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.flatbuffers</groupId>
+            <artifactId>flatbuffers-java-grpc</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-stub</artifactId>
+            <version>${gRPC.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-netty</artifactId>
+            <version>${gRPC.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>add-source</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-test-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>${project.basedir}</source>
+				<source>${project.basedir}/../../tests</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+        <!--<testSourceDirectory>${project.basedir}</testSourceDirectory>-->
+    </build>
+</project>
+