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Diffstat (limited to 'include/grpcpp/impl/codegen/client_callback.h')
-rw-r--r-- | include/grpcpp/impl/codegen/client_callback.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/include/grpcpp/impl/codegen/client_callback.h b/include/grpcpp/impl/codegen/client_callback.h new file mode 100644 index 0000000000..4baa819091 --- /dev/null +++ b/include/grpcpp/impl/codegen/client_callback.h @@ -0,0 +1,95 @@ +/* + * + * 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_core_cq_tag(tag); + call.PerformOps(ops); + } +}; + +} // namespace internal +} // namespace grpc + +#endif // GRPCPP_IMPL_CODEGEN_CLIENT_CALLBACK_H |