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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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218 lines
7.9 KiB
218 lines
7.9 KiB
/* |
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* |
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* Copyright 2014, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef __GRPCPP_IMPL_RPC_SERVICE_METHOD_H__ |
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#define __GRPCPP_IMPL_RPC_SERVICE_METHOD_H__ |
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#include <functional> |
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#include <map> |
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#include <memory> |
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#include <vector> |
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#include <grpc++/impl/rpc_method.h> |
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#include <grpc++/status.h> |
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#include <grpc++/stream.h> |
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#include <google/protobuf/message.h> |
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namespace grpc { |
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class ServerContext; |
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class StreamContextInterface; |
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// TODO(rocking): we might need to split this file into multiple ones. |
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// Base class for running an RPC handler. |
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class MethodHandler { |
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public: |
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virtual ~MethodHandler() {} |
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struct HandlerParameter { |
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HandlerParameter(ServerContext* context, |
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const google::protobuf::Message* req, |
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google::protobuf::Message* resp) |
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: server_context(context), |
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request(req), |
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response(resp), |
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stream_context(nullptr) {} |
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HandlerParameter(ServerContext* context, |
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const google::protobuf::Message* req, |
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google::protobuf::Message* resp, |
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StreamContextInterface* stream) |
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: server_context(context), |
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request(req), |
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response(resp), |
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stream_context(stream) {} |
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ServerContext* server_context; |
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const google::protobuf::Message* request; |
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google::protobuf::Message* response; |
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StreamContextInterface* stream_context; |
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}; |
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virtual Status RunHandler(const HandlerParameter& param) = 0; |
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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( |
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std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
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ResponseType*)> func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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Status RunHandler(const HandlerParameter& param) final { |
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// Invoke application function, cast proto messages to their actual types. |
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return func_(service_, param.server_context, |
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dynamic_cast<const RequestType*>(param.request), |
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dynamic_cast<ResponseType*>(param.response)); |
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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*)> 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*)> func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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Status RunHandler(const HandlerParameter& param) final { |
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ServerReader<RequestType> reader(param.stream_context); |
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return func_(service_, param.server_context, &reader, |
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dynamic_cast<ResponseType*>(param.response)); |
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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*)> 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>*)> func, |
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ServiceType* service) |
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: func_(func), service_(service) {} |
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Status RunHandler(const HandlerParameter& param) final { |
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ServerWriter<ResponseType> writer(param.stream_context); |
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return func_(service_, param.server_context, |
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dynamic_cast<const RequestType*>(param.request), &writer); |
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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>*)> 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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template <class ServiceType, class RequestType, class ResponseType> |
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class BidiStreamingHandler : public MethodHandler { |
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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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: func_(func), service_(service) {} |
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Status RunHandler(const HandlerParameter& param) final { |
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ServerReaderWriter<ResponseType, RequestType> stream(param.stream_context); |
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return func_(service_, param.server_context, &stream); |
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} |
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private: |
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std::function<Status(ServiceType*, ServerContext*, |
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ServerReaderWriter<ResponseType, RequestType>*)> func_; |
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ServiceType* service_; |
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}; |
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// Server side rpc method class |
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class RpcServiceMethod : public RpcMethod { |
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public: |
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// Takes ownership of the handler and two prototype objects. |
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RpcServiceMethod(const char* name, RpcMethod::RpcType type, |
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MethodHandler* handler, |
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google::protobuf::Message* request_prototype, |
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google::protobuf::Message* response_prototype) |
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: RpcMethod(name, type), |
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handler_(handler), |
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request_prototype_(request_prototype), |
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response_prototype_(response_prototype) {} |
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MethodHandler* handler() { return handler_.get(); } |
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google::protobuf::Message* AllocateRequestProto() { |
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return request_prototype_->New(); |
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} |
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google::protobuf::Message* AllocateResponseProto() { |
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return response_prototype_->New(); |
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} |
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private: |
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std::unique_ptr<MethodHandler> handler_; |
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std::unique_ptr<google::protobuf::Message> request_prototype_; |
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std::unique_ptr<google::protobuf::Message> response_prototype_; |
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}; |
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// This class contains all the method information for an rpc service. It is |
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// used for registering a service on a grpc server. |
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class RpcService { |
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public: |
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// Takes ownership. |
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void AddMethod(RpcServiceMethod* method) { |
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methods_.push_back(std::unique_ptr<RpcServiceMethod>(method)); |
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} |
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RpcServiceMethod* GetMethod(int i) { return methods_[i].get(); } |
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int GetMethodCount() const { return methods_.size(); } |
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private: |
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std::vector<std::unique_ptr<RpcServiceMethod>> methods_; |
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}; |
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} // namespace grpc |
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#endif // __GRPCPP_IMPL_RPC_SERVICE_METHOD_H__
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