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using System;
using System.Threading;
using System.Threading.Tasks;
using Google.GRPC.Core.Internal;
namespace Google.GRPC.Core
{
// NOTE: this class is work-in-progress
/// <summary>
/// Helper methods for generated stubs to make RPC calls.
/// </summary>
public static class Calls
{
public static TResponse BlockingUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
{
//TODO: implement this in real synchronous style once new GRPC C core API is available.
return AsyncUnaryCall(call, req, token).Result;
}
public static async Task<TResponse> AsyncUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestSerializer, call.ResponseDeserializer);
asyncCall.Initialize(call.Channel, call.MethodName);
asyncCall.Start(false, GetCompletionQueue());
await asyncCall.WriteAsync(req);
await asyncCall.WritesCompletedAsync();
TResponse response = await asyncCall.ReadAsync();
Status status = await asyncCall.Finished;
if (status.StatusCode != StatusCode.GRPC_STATUS_OK)
{
throw new RpcException(status);
}
return response;
}
public static async Task AsyncServerStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, IObserver<TResponse> outputs, CancellationToken token)
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestSerializer, call.ResponseDeserializer);
asyncCall.Initialize(call.Channel, call.MethodName);
asyncCall.Start(false, GetCompletionQueue());
asyncCall.StartReadingToStream(outputs);
await asyncCall.WriteAsync(req);
await asyncCall.WritesCompletedAsync();
}
public static ClientStreamingAsyncResult<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestSerializer, call.ResponseDeserializer);
asyncCall.Initialize(call.Channel, call.MethodName);
asyncCall.Start(false, GetCompletionQueue());
var task = asyncCall.ReadAsync();
var inputs = new StreamingInputObserver<TRequest, TResponse>(asyncCall);
return new ClientStreamingAsyncResult<TRequest, TResponse>(task, inputs);
}
public static TResponse BlockingClientStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, IObservable<TRequest> inputs, CancellationToken token)
{
throw new NotImplementedException();
}
public static IObserver<TRequest> DuplexStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, IObserver<TResponse> outputs, CancellationToken token)
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestSerializer, call.ResponseDeserializer);
asyncCall.Initialize(call.Channel, call.MethodName);
asyncCall.Start(false, GetCompletionQueue());
asyncCall.StartReadingToStream(outputs);
var inputs = new StreamingInputObserver<TRequest, TResponse>(asyncCall);
return inputs;
}
private static CompletionQueueSafeHandle GetCompletionQueue() {
return GrpcEnvironment.ThreadPool.CompletionQueue;
}
}
}
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