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/*
*
* Copyright 2018 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 GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H
#define GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H
#include <functional>
#include <grpcpp/impl/codegen/call.h>
#include <grpcpp/impl/codegen/callback_common.h>
#include <grpcpp/impl/codegen/channel_interface.h>
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen_interface.h>
#include <grpcpp/impl/codegen/status.h>
namespace grpc {
class Channel;
class ClientContext;
class CompletionQueue;
namespace internal {
class RpcMethod;
/// Perform a callback-based unary call
/// TODO(vjpai): Combine as much as possible with the blocking unary call code
template <class InputMessage, class OutputMessage>
void CallbackUnaryCall(ChannelInterface* channel, const RpcMethod& method,
ClientContext* context, const InputMessage* request,
OutputMessage* result,
std::function<void(Status)> on_completion) {
CallbackUnaryCallImpl<InputMessage, OutputMessage> x(
channel, method, context, request, result, on_completion);
}
template <class InputMessage, class OutputMessage>
class CallbackUnaryCallImpl {
public:
CallbackUnaryCallImpl(ChannelInterface* channel, const RpcMethod& method,
ClientContext* context, const InputMessage* request,
OutputMessage* result,
std::function<void(Status)> on_completion) {
CompletionQueue* cq = channel->CallbackCQ();
GPR_CODEGEN_ASSERT(cq != nullptr);
Call call(channel->CreateCall(method, context, cq));
using FullCallOpSet =
CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>,
CallOpClientSendClose, CallOpClientRecvStatus>;
auto* ops = new (g_core_codegen_interface->grpc_call_arena_alloc(
call.call(), sizeof(FullCallOpSet))) FullCallOpSet;
auto* tag = new (g_core_codegen_interface->grpc_call_arena_alloc(
call.call(), sizeof(CallbackWithStatusTag)))
CallbackWithStatusTag(call.call(), on_completion, ops);
// TODO(vjpai): Unify code with sync API as much as possible
Status s = ops->SendMessage(*request);
if (!s.ok()) {
tag->force_run(s);
return;
}
ops->SendInitialMetadata(context->send_initial_metadata_,
context->initial_metadata_flags());
ops->RecvInitialMetadata(context);
ops->RecvMessage(result);
ops->AllowNoMessage();
ops->ClientSendClose();
ops->ClientRecvStatus(context, tag->status_ptr());
ops->set_cq_tag(tag);
call.PerformOps(ops);
}
};
} // namespace internal
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H
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