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using System;
using Google.GRPC.Core.Internal;
namespace Google.GRPC.Core
{
internal interface IServerCallHandler
{
void StartCall(string methodName, CallSafeHandle call, CompletionQueueSafeHandle cq);
}
internal class UnaryRequestServerCallHandler<TRequest, TResponse> : IServerCallHandler
{
readonly Method<TRequest, TResponse> method;
readonly UnaryRequestServerMethod<TRequest, TResponse> handler;
public UnaryRequestServerCallHandler(Method<TRequest, TResponse> method, UnaryRequestServerMethod<TRequest, TResponse> handler)
{
this.method = method;
this.handler = handler;
}
public void StartCall(string methodName, CallSafeHandle call, CompletionQueueSafeHandle cq)
{
var asyncCall = new AsyncCall<TResponse, TRequest>(
method.ResponseMarshaller.Serializer,
method.RequestMarshaller.Deserializer);
asyncCall.InitializeServer(call);
asyncCall.Accept(cq);
var request = asyncCall.ReadAsync().Result;
var responseObserver = new ServerWritingObserver<TResponse, TRequest>(asyncCall);
handler(request, responseObserver);
asyncCall.Halfclosed.Wait();
asyncCall.Finished.Wait();
}
}
internal class StreamingRequestServerCallHandler<TRequest, TResponse> : IServerCallHandler
{
readonly Method<TRequest, TResponse> method;
readonly StreamingRequestServerMethod<TRequest, TResponse> handler;
public StreamingRequestServerCallHandler(Method<TRequest, TResponse> method, StreamingRequestServerMethod<TRequest, TResponse> handler)
{
this.method = method;
this.handler = handler;
}
public void StartCall(string methodName, CallSafeHandle call, CompletionQueueSafeHandle cq)
{
var asyncCall = new AsyncCall<TResponse, TRequest>(
method.ResponseMarshaller.Serializer,
method.RequestMarshaller.Deserializer);
asyncCall.InitializeServer(call);
asyncCall.Accept(cq);
var responseObserver = new ServerWritingObserver<TResponse, TRequest>(asyncCall);
var requestObserver = handler(responseObserver);
// feed the requests
asyncCall.StartReadingToStream(requestObserver);
asyncCall.Halfclosed.Wait();
asyncCall.Finished.Wait();
}
}
internal class NoSuchMethodCallHandler : IServerCallHandler
{
public void StartCall(string methodName, CallSafeHandle call, CompletionQueueSafeHandle cq)
{
// We don't care about the payload type here.
AsyncCall<byte[], byte[]> asyncCall = new AsyncCall<byte[], byte[]>(
(payload) => payload, (payload) => payload);
asyncCall.InitializeServer(call);
asyncCall.Accept(cq);
asyncCall.WriteStatusAsync(new Status(StatusCode.GRPC_STATUS_UNIMPLEMENTED, "No such method.")).Wait();
asyncCall.Finished.Wait();
}
}
}
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