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/*
*
* 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 GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
#define GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
#include <grpc++/impl/codegen/call.h>
#include <grpc++/impl/codegen/channel_interface.h>
#include <grpc++/impl/codegen/config.h>
#include <grpc++/impl/codegen/core_codegen_interface.h>
#include <grpc++/impl/codegen/status.h>
namespace grpc {
class Channel;
class ClientContext;
class CompletionQueue;
class RpcMethod;
/// Wrapper that performs a blocking unary call
template <class InputMessage, class OutputMessage>
Status BlockingUnaryCall(ChannelInterface* channel, const RpcMethod& method,
ClientContext* context, const InputMessage& request,
OutputMessage* result) {
CompletionQueue cq(grpc_completion_queue_attributes{
GRPC_CQ_CURRENT_VERSION, GRPC_CQ_PLUCK,
GRPC_CQ_DEFAULT_POLLING}); // Pluckable completion queue
Call call(channel->CreateCall(method, context, &cq));
CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>,
CallOpClientSendClose, CallOpClientRecvStatus>
ops;
Status status = ops.SendMessage(request);
if (!status.ok()) {
return status;
}
ops.SendInitialMetadata(context->send_initial_metadata_,
context->initial_metadata_flags());
ops.RecvInitialMetadata(context);
ops.RecvMessage(result);
ops.ClientSendClose();
ops.ClientRecvStatus(context, &status);
call.PerformOps(&ops);
if (cq.Pluck(&ops)) {
if (!ops.got_message && status.ok()) {
return Status(StatusCode::UNIMPLEMENTED,
"No message returned for unary request");
}
} else {
GPR_CODEGEN_ASSERT(!status.ok());
}
return status;
}
} // namespace grpc
#endif // GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
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