dotnet-cqrs/PoweredSoft.CQRS.GraphQL.HotChocolate.DynamicQuery/DynamicQueryObjectType.cs

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using HotChocolate.Types;
using PoweredSoft.CQRS.Abstractions;
using PoweredSoft.CQRS.Abstractions.Discovery;
using PoweredSoft.CQRS.DynamicQuery.Discover;
using System;
namespace PoweredSoft.CQRS.GraphQL.HotChocolate.DynamicQuery
{
internal class DynamicQueryObjectType : ObjectTypeExtension
{
private readonly IQueryDiscovery queryDiscovery;
public DynamicQueryObjectType(IQueryDiscovery queryDiscovery) : base()
{
this.queryDiscovery = queryDiscovery;
}
protected override void Configure(IObjectTypeDescriptor descriptor)
{
base.Configure(descriptor);
descriptor.Name("Query");
foreach(var q in queryDiscovery.GetQueries())
{
if (q.Category == "DynamicQuery" && q is DynamicQueryMeta dq)
{
var f = descriptor.Field(q.LowerCamelCaseName);
// service to execute with.
var queryHandlerServiceType = typeof(IQueryHandler<,>).MakeGenericType(dq.QueryType, dq.QueryResultType);
// destermine argument type.
Type argumentType;
Type runnerType;
if (dq.ParamsType != null)
{
argumentType = typeof(GraphQL.DynamicQuery.GraphQLDynamicQuery<,,>).MakeGenericType(
dq.SourceType, dq.DestinationType, dq.ParamsType);
runnerType = typeof(DynamicQueryRunnerWithParams<,,>)
.MakeGenericType(dq.SourceType, dq.DestinationType, dq.ParamsType);
}
else
{
argumentType = typeof(GraphQL.DynamicQuery.GraphQLDynamicQuery<,>).MakeGenericType(
dq.SourceType, dq.DestinationType);
runnerType = typeof(DynamicQueryRunner<,>)
.MakeGenericType(dq.SourceType, dq.DestinationType);
}
f.Argument("params", a => a
.Type(argumentType)
.DefaultValue(Activator.CreateInstance(argumentType))
);
// make generic type of outgoing type.
var resultType = typeof(GraphQL.DynamicQuery.GraphQLDynamicQueryExecutionResult<>)
.MakeGenericType(dq.DestinationType);
f.Type(resultType);
// security middleware
f.Use((sp, d) => new QueryAuthorizationMiddleware(q.QueryType, d));
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// middleware to validate.
f.Use<QueryValidationMiddleware>();
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// resolver
f.Resolve(async r =>
{
dynamic argument = r.ArgumentValue<object>("params");
// handler service.
var service = r.Service(queryHandlerServiceType);
// runner.
dynamic runner = Activator.CreateInstance(runnerType, new object[] { service });
// get outcome.
object outcome = await runner.RunAsync(argument, r.RequestAborted);
return outcome;
});
}
}
}
}
}