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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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302 lines
11 KiB
302 lines
11 KiB
/* |
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* |
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* Copyright 2015 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_METHOD_HANDLER_IMPL_H |
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#define GRPCPP_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H |
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#include <grpcpp/impl/codegen/byte_buffer.h> |
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#include <grpcpp/impl/codegen/core_codegen_interface.h> |
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#include <grpcpp/impl/codegen/rpc_service_method.h> |
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#include <grpcpp/impl/codegen/sync_stream.h> |
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namespace grpc { |
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namespace internal { |
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// Invoke the method handler, fill in the status, and |
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// return whether or not we finished safely (without an exception). |
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// Note that exception handling is 0-cost in most compiler/library |
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// implementations (except when an exception is actually thrown), |
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// so this process doesn't require additional overhead in the common case. |
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// Additionally, we don't need to return if we caught an exception or not; |
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// the handling is the same in either case. |
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template <class Callable> |
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Status CatchingFunctionHandler(Callable&& handler) { |
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#if GRPC_ALLOW_EXCEPTIONS |
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try { |
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return handler(); |
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} catch (...) { |
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return Status(StatusCode::UNKNOWN, "Unexpected error in RPC handling"); |
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} |
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#else // GRPC_ALLOW_EXCEPTIONS |
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return handler(); |
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#endif // GRPC_ALLOW_EXCEPTIONS |
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} |
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/// A wrapper class of an application provided rpc method handler. |
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template <class ServiceType, class RequestType, class ResponseType> |
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class RpcMethodHandler : public MethodHandler { |
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public: |
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RpcMethodHandler(std::function<Status(ServiceType*, ServerContext*, |
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const RequestType*, ResponseType*)> |
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func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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void RunHandler(const HandlerParameter& param) final { |
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RequestType req; |
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Status status = SerializationTraits<RequestType>::Deserialize( |
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param.request.bbuf_ptr(), &req); |
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ResponseType rsp; |
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if (status.ok()) { |
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status = CatchingFunctionHandler([this, ¶m, &req, &rsp] { |
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return func_(service_, param.server_context, &req, &rsp); |
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}); |
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} |
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GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_); |
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CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, |
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CallOpServerSendStatus> |
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ops; |
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ops.SendInitialMetadata(param.server_context->initial_metadata_, |
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param.server_context->initial_metadata_flags()); |
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if (param.server_context->compression_level_set()) { |
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ops.set_compression_level(param.server_context->compression_level()); |
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} |
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if (status.ok()) { |
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status = ops.SendMessage(rsp); |
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} |
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ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
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param.call->PerformOps(&ops); |
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param.call->cq()->Pluck(&ops); |
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} |
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private: |
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/// Application provided rpc handler function. |
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std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
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ResponseType*)> |
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func_; |
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// The class the above handler function lives in. |
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ServiceType* service_; |
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}; |
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/// A wrapper class of an application provided client streaming handler. |
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template <class ServiceType, class RequestType, class ResponseType> |
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class ClientStreamingHandler : public MethodHandler { |
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public: |
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ClientStreamingHandler( |
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std::function<Status(ServiceType*, ServerContext*, |
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ServerReader<RequestType>*, ResponseType*)> |
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func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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void RunHandler(const HandlerParameter& param) final { |
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ServerReader<RequestType> reader(param.call, param.server_context); |
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ResponseType rsp; |
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Status status = CatchingFunctionHandler([this, ¶m, &reader, &rsp] { |
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return func_(service_, param.server_context, &reader, &rsp); |
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}); |
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GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_); |
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CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, |
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CallOpServerSendStatus> |
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ops; |
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ops.SendInitialMetadata(param.server_context->initial_metadata_, |
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param.server_context->initial_metadata_flags()); |
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if (param.server_context->compression_level_set()) { |
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ops.set_compression_level(param.server_context->compression_level()); |
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} |
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if (status.ok()) { |
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status = ops.SendMessage(rsp); |
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} |
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ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
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param.call->PerformOps(&ops); |
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param.call->cq()->Pluck(&ops); |
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} |
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private: |
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std::function<Status(ServiceType*, ServerContext*, ServerReader<RequestType>*, |
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ResponseType*)> |
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func_; |
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ServiceType* service_; |
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}; |
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/// A wrapper class of an application provided server streaming handler. |
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template <class ServiceType, class RequestType, class ResponseType> |
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class ServerStreamingHandler : public MethodHandler { |
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public: |
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ServerStreamingHandler( |
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std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
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ServerWriter<ResponseType>*)> |
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func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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void RunHandler(const HandlerParameter& param) final { |
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RequestType req; |
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Status status = SerializationTraits<RequestType>::Deserialize( |
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param.request.bbuf_ptr(), &req); |
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if (status.ok()) { |
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ServerWriter<ResponseType> writer(param.call, param.server_context); |
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status = CatchingFunctionHandler([this, ¶m, &req, &writer] { |
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return func_(service_, param.server_context, &req, &writer); |
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}); |
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} |
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CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
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if (!param.server_context->sent_initial_metadata_) { |
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ops.SendInitialMetadata(param.server_context->initial_metadata_, |
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param.server_context->initial_metadata_flags()); |
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if (param.server_context->compression_level_set()) { |
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ops.set_compression_level(param.server_context->compression_level()); |
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} |
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} |
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ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
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param.call->PerformOps(&ops); |
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if (param.server_context->has_pending_ops_) { |
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param.call->cq()->Pluck(¶m.server_context->pending_ops_); |
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} |
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param.call->cq()->Pluck(&ops); |
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} |
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private: |
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std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
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ServerWriter<ResponseType>*)> |
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func_; |
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ServiceType* service_; |
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}; |
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/// A wrapper class of an application provided bidi-streaming handler. |
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/// This also applies to server-streamed implementation of a unary method |
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/// with the additional requirement that such methods must have done a |
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/// write for status to be ok |
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/// Since this is used by more than 1 class, the service is not passed in. |
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/// Instead, it is expected to be an implicitly-captured argument of func |
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/// (through bind or something along those lines) |
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template <class Streamer, bool WriteNeeded> |
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class TemplatedBidiStreamingHandler : public MethodHandler { |
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public: |
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TemplatedBidiStreamingHandler( |
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std::function<Status(ServerContext*, Streamer*)> func) |
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: func_(func), write_needed_(WriteNeeded) {} |
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void RunHandler(const HandlerParameter& param) final { |
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Streamer stream(param.call, param.server_context); |
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Status status = CatchingFunctionHandler([this, ¶m, &stream] { |
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return func_(param.server_context, &stream); |
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}); |
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CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
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if (!param.server_context->sent_initial_metadata_) { |
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ops.SendInitialMetadata(param.server_context->initial_metadata_, |
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param.server_context->initial_metadata_flags()); |
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if (param.server_context->compression_level_set()) { |
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ops.set_compression_level(param.server_context->compression_level()); |
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} |
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if (write_needed_ && status.ok()) { |
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// If we needed a write but never did one, we need to mark the |
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// status as a fail |
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status = Status(StatusCode::INTERNAL, |
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"Service did not provide response message"); |
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} |
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} |
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ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
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param.call->PerformOps(&ops); |
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if (param.server_context->has_pending_ops_) { |
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param.call->cq()->Pluck(¶m.server_context->pending_ops_); |
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} |
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param.call->cq()->Pluck(&ops); |
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} |
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private: |
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std::function<Status(ServerContext*, Streamer*)> func_; |
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const bool write_needed_; |
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}; |
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template <class ServiceType, class RequestType, class ResponseType> |
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class BidiStreamingHandler |
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: public TemplatedBidiStreamingHandler< |
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ServerReaderWriter<ResponseType, RequestType>, false> { |
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public: |
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BidiStreamingHandler( |
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std::function<Status(ServiceType*, ServerContext*, |
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ServerReaderWriter<ResponseType, RequestType>*)> |
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func, |
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ServiceType* service) |
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: TemplatedBidiStreamingHandler< |
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ServerReaderWriter<ResponseType, RequestType>, false>(std::bind( |
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func, service, std::placeholders::_1, std::placeholders::_2)) {} |
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}; |
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template <class RequestType, class ResponseType> |
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class StreamedUnaryHandler |
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: public TemplatedBidiStreamingHandler< |
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ServerUnaryStreamer<RequestType, ResponseType>, true> { |
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public: |
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explicit StreamedUnaryHandler( |
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std::function<Status(ServerContext*, |
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ServerUnaryStreamer<RequestType, ResponseType>*)> |
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func) |
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: TemplatedBidiStreamingHandler< |
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ServerUnaryStreamer<RequestType, ResponseType>, true>(func) {} |
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}; |
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template <class RequestType, class ResponseType> |
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class SplitServerStreamingHandler |
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: public TemplatedBidiStreamingHandler< |
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ServerSplitStreamer<RequestType, ResponseType>, false> { |
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public: |
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explicit SplitServerStreamingHandler( |
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std::function<Status(ServerContext*, |
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ServerSplitStreamer<RequestType, ResponseType>*)> |
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func) |
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: TemplatedBidiStreamingHandler< |
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ServerSplitStreamer<RequestType, ResponseType>, false>(func) {} |
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}; |
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/// Handle unknown method by returning UNIMPLEMENTED error. |
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class UnknownMethodHandler : public MethodHandler { |
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public: |
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template <class T> |
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static void FillOps(ServerContext* context, T* ops) { |
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Status status(StatusCode::UNIMPLEMENTED, ""); |
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if (!context->sent_initial_metadata_) { |
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ops->SendInitialMetadata(context->initial_metadata_, |
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context->initial_metadata_flags()); |
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if (context->compression_level_set()) { |
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ops->set_compression_level(context->compression_level()); |
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} |
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context->sent_initial_metadata_ = true; |
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} |
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ops->ServerSendStatus(context->trailing_metadata_, status); |
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} |
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void RunHandler(const HandlerParameter& param) final { |
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CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
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FillOps(param.server_context, &ops); |
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param.call->PerformOps(&ops); |
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param.call->cq()->Pluck(&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_METHOD_HANDLER_IMPL_H
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