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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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93 lines
3.2 KiB
93 lines
3.2 KiB
7 years ago
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/*
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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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// TODO(vjpai): Allocate this as part of the tag's arena
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auto* ops = new CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
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CallOpRecvInitialMetadata,
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CallOpRecvMessage<OutputMessage>,
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CallOpClientSendClose, CallOpClientRecvStatus>;
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// TODO(vjpai): Move to using pre-allocated tags rather than new/self-delete
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auto* tag = new CallbackWithStatusTag(on_completion, true, ops);
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// TODO(vjpai): Unify code with sync API as much as possible
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Call call(channel->CreateCall(method, context, cq));
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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->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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