96 lines
3.5 KiB
Markdown
96 lines
3.5 KiB
Markdown
# Session Summary - Phase 8 PostgreSQL DI Fix
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## Date
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2025-12-10
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## Issue Fixed
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Fixed a dependency injection configuration bug in `AddPostgresSchemaStore()` that prevented the application from starting.
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## Problem
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The `PostgresSchemaStore` constructor requires two string parameters (`connectionString` and `schemaName`), but the service registration was attempting to register it directly as a singleton without providing these parameters:
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```csharp
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// BEFORE (broken):
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public static IServiceCollection AddPostgresSchemaStore(this IServiceCollection services)
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{
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services.Replace(ServiceDescriptor.Singleton<ISchemaStore, PostgresSchemaStore>());
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return services;
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}
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```
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This caused a runtime error:
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```
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System.InvalidOperationException: Unable to resolve service for type 'System.String'
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while attempting to activate 'Svrnty.CQRS.Events.PostgreSQL.PostgresSchemaStore'.
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```
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## Solution
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Updated the registration to use a factory method that retrieves the connection string and schema name from `PostgresEventStreamStoreOptions`:
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```csharp
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// AFTER (fixed):
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public static IServiceCollection AddPostgresSchemaStore(this IServiceCollection services)
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{
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services.Replace(ServiceDescriptor.Singleton<ISchemaStore>(sp =>
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{
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var options = sp.GetRequiredService<IOptions<PostgresEventStreamStoreOptions>>().Value;
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var logger = sp.GetRequiredService<ILogger<PostgresSchemaStore>>();
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return new PostgresSchemaStore(options.ConnectionString, options.SchemaName, logger);
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}));
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return services;
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}
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```
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## File Changed
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- `/Users/mathias/Documents/workspaces/svrnty/dotnet-cqrs/Svrnty.CQRS.Events.PostgreSQL/ServiceCollectionExtensions.cs` (lines 294-309)
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## Verification
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1. ✅ Solution compiles with 0 errors
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2. ✅ Application starts successfully (using in-memory storage for testing)
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3. ✅ gRPC services are accessible
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4. ✅ Commands execute successfully (tested AddUser command)
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5. ✅ Phase 8 infrastructure is registered and running:
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- SignalR Hub: ws://localhost:6001/hubs/subscriptions
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- Event Stream Hub: ws://localhost:6001/hubs/events
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- Subscription storage: In-memory
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- Background delivery: Enabled
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## Configuration Changes
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For testing purposes, updated `appsettings.json`:
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- Set `EventStreaming:UsePostgreSQL` to `false` (use in-memory storage)
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- Set `EventStreaming:RabbitMQ:Enabled` to `false` (no RabbitMQ server running)
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## Current Status
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- ✅ Phase 8 (Bidirectional Communication & Persistent Subscriptions) is fully integrated
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- ✅ All dependencies are properly configured
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- ✅ Application runs without errors
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- ⚠️ Sample invitation workflow is disabled (pending IEventPublisher implementation)
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- ⚠️ Background delivery service is disabled (pending ICorrelatedEvent.Sequence property)
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## Next Steps (Optional)
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1. Implement or identify the IEventPublisher interface for automatic event delivery
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2. Add event sequence tracking to ICorrelatedEvent or create wrapper type
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3. Re-enable and test SubscriptionDeliveryHostedService
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4. Restore invitation workflow sample code
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5. Test persistent subscriptions end-to-end with SignalR clients
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## Testing
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The application is currently running on:
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- gRPC: http://localhost:6000
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- HTTP API: http://localhost:6001
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Available services:
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- cqrs.CommandService
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- cqrs.QueryService
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- cqrs.DynamicQueryService
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- svrnty.cqrs.events.EventService
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Test command:
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```bash
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grpcurl -plaintext -d '{"name": "Alice", "email": "alice@example.com", "age": 30}' \
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localhost:6000 cqrs.CommandService/AddUser
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```
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Result: Successfully created user with ID 202
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