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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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95 lines
3.3 KiB
95 lines
3.3 KiB
/* |
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* |
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* Copyright 2018 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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#ifndef GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H |
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#define GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H |
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#include <functional> |
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#include <grpcpp/impl/codegen/call.h> |
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#include <grpcpp/impl/codegen/callback_common.h> |
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#include <grpcpp/impl/codegen/channel_interface.h> |
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#include <grpcpp/impl/codegen/config.h> |
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#include <grpcpp/impl/codegen/core_codegen_interface.h> |
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#include <grpcpp/impl/codegen/status.h> |
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namespace grpc { |
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class Channel; |
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class ClientContext; |
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class CompletionQueue; |
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namespace internal { |
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class RpcMethod; |
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/// Perform a callback-based unary call |
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/// TODO(vjpai): Combine as much as possible with the blocking unary call code |
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template <class InputMessage, class OutputMessage> |
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void CallbackUnaryCall(ChannelInterface* channel, const RpcMethod& method, |
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ClientContext* context, const InputMessage* request, |
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OutputMessage* result, |
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std::function<void(Status)> on_completion) { |
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CallbackUnaryCallImpl<InputMessage, OutputMessage> x( |
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channel, method, context, request, result, on_completion); |
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} |
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template <class InputMessage, class OutputMessage> |
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class CallbackUnaryCallImpl { |
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public: |
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CallbackUnaryCallImpl(ChannelInterface* channel, const RpcMethod& method, |
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ClientContext* context, const InputMessage* request, |
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OutputMessage* result, |
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std::function<void(Status)> on_completion) { |
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CompletionQueue* cq = channel->CallbackCQ(); |
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GPR_CODEGEN_ASSERT(cq != nullptr); |
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Call call = channel->CreateCall(method, context, cq); |
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using FullCallOpSet = |
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CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, |
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CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>, |
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CallOpClientSendClose, CallOpClientRecvStatus>; |
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auto* ops = new (g_core_codegen_interface->grpc_call_arena_alloc( |
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call.call(), sizeof(FullCallOpSet))) FullCallOpSet; |
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auto* tag = new (g_core_codegen_interface->grpc_call_arena_alloc( |
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call.call(), sizeof(CallbackWithStatusTag))) |
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CallbackWithStatusTag(call.call(), on_completion, ops); |
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// TODO(vjpai): Unify code with sync API as much as possible |
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Status s = ops->SendMessage(*request); |
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if (!s.ok()) { |
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tag->force_run(s); |
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return; |
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} |
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ops->SendInitialMetadata(context->send_initial_metadata_, |
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context->initial_metadata_flags()); |
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ops->RecvInitialMetadata(context); |
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ops->RecvMessage(result); |
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ops->AllowNoMessage(); |
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ops->ClientSendClose(); |
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ops->ClientRecvStatus(context, tag->status_ptr()); |
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ops->set_cq_tag(tag); |
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call.PerformOps(ops); |
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} |
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}; |
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} // namespace internal |
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} // namespace grpc |
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#endif // GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H
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