| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #ifndef GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H |
| #define GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H |
| |
| #include <grpc++/impl/codegen/core_codegen_interface.h> |
| #include <grpc++/impl/codegen/rpc_service_method.h> |
| #include <grpc++/impl/codegen/sync_stream.h> |
| |
| namespace grpc { |
| |
| // A wrapper class of an application provided rpc method handler. |
| template <class ServiceType, class RequestType, class ResponseType> |
| class RpcMethodHandler : public MethodHandler { |
| public: |
| RpcMethodHandler(std::function<Status(ServiceType*, ServerContext*, |
| const RequestType*, ResponseType*)> |
| func, |
| ServiceType* service) |
| : func_(func), service_(service) {} |
| |
| void RunHandler(const HandlerParameter& param) final { |
| RequestType req; |
| Status status = SerializationTraits<RequestType>::Deserialize( |
| param.request, &req, param.max_receive_message_size); |
| ResponseType rsp; |
| if (status.ok()) { |
| status = func_(service_, param.server_context, &req, &rsp); |
| } |
| |
| GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_); |
| CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, |
| CallOpServerSendStatus> |
| ops; |
| ops.SendInitialMetadata(param.server_context->initial_metadata_, |
| param.server_context->initial_metadata_flags()); |
| if (param.server_context->compression_level_set()) { |
| ops.set_compression_level(param.server_context->compression_level()); |
| } |
| if (status.ok()) { |
| status = ops.SendMessage(rsp); |
| } |
| ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
| param.call->PerformOps(&ops); |
| param.call->cq()->Pluck(&ops); |
| } |
| |
| private: |
| // Application provided rpc handler function. |
| std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
| ResponseType*)> |
| func_; |
| // The class the above handler function lives in. |
| ServiceType* service_; |
| }; |
| |
| // A wrapper class of an application provided client streaming handler. |
| template <class ServiceType, class RequestType, class ResponseType> |
| class ClientStreamingHandler : public MethodHandler { |
| public: |
| ClientStreamingHandler( |
| std::function<Status(ServiceType*, ServerContext*, |
| ServerReader<RequestType>*, ResponseType*)> |
| func, |
| ServiceType* service) |
| : func_(func), service_(service) {} |
| |
| void RunHandler(const HandlerParameter& param) final { |
| ServerReader<RequestType> reader(param.call, param.server_context); |
| ResponseType rsp; |
| Status status = func_(service_, param.server_context, &reader, &rsp); |
| |
| GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_); |
| CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, |
| CallOpServerSendStatus> |
| ops; |
| ops.SendInitialMetadata(param.server_context->initial_metadata_, |
| param.server_context->initial_metadata_flags()); |
| if (param.server_context->compression_level_set()) { |
| ops.set_compression_level(param.server_context->compression_level()); |
| } |
| if (status.ok()) { |
| status = ops.SendMessage(rsp); |
| } |
| ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
| param.call->PerformOps(&ops); |
| param.call->cq()->Pluck(&ops); |
| } |
| |
| private: |
| std::function<Status(ServiceType*, ServerContext*, ServerReader<RequestType>*, |
| ResponseType*)> |
| func_; |
| ServiceType* service_; |
| }; |
| |
| // A wrapper class of an application provided server streaming handler. |
| template <class ServiceType, class RequestType, class ResponseType> |
| class ServerStreamingHandler : public MethodHandler { |
| public: |
| ServerStreamingHandler( |
| std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
| ServerWriter<ResponseType>*)> |
| func, |
| ServiceType* service) |
| : func_(func), service_(service) {} |
| |
| void RunHandler(const HandlerParameter& param) final { |
| RequestType req; |
| Status status = SerializationTraits<RequestType>::Deserialize( |
| param.request, &req, param.max_receive_message_size); |
| |
| if (status.ok()) { |
| ServerWriter<ResponseType> writer(param.call, param.server_context); |
| status = func_(service_, param.server_context, &req, &writer); |
| } |
| |
| CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
| if (!param.server_context->sent_initial_metadata_) { |
| ops.SendInitialMetadata(param.server_context->initial_metadata_, |
| param.server_context->initial_metadata_flags()); |
| if (param.server_context->compression_level_set()) { |
| ops.set_compression_level(param.server_context->compression_level()); |
| } |
| } |
| ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
| param.call->PerformOps(&ops); |
| param.call->cq()->Pluck(&ops); |
| } |
| |
| private: |
| std::function<Status(ServiceType*, ServerContext*, const RequestType*, |
| ServerWriter<ResponseType>*)> |
| func_; |
| ServiceType* service_; |
| }; |
| |
| // A wrapper class of an application provided bidi-streaming handler. |
| // This also applies to server-streamed implementation of a unary method |
| // with the additional requirement that such methods must have done a |
| // write for status to be ok |
| // Since this is used by more than 1 class, the service is not passed in. |
| // Instead, it is expected to be an implicitly-captured argument of func |
| // (through bind or something along those lines) |
| template <class Streamer, bool WriteNeeded> |
| class TemplatedBidiStreamingHandler : public MethodHandler { |
| public: |
| TemplatedBidiStreamingHandler( |
| std::function<Status(ServerContext*, Streamer*)> func) |
| : func_(func), write_needed_(WriteNeeded) {} |
| |
| void RunHandler(const HandlerParameter& param) final { |
| Streamer stream(param.call, param.server_context); |
| Status status = func_(param.server_context, &stream); |
| |
| CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
| if (!param.server_context->sent_initial_metadata_) { |
| ops.SendInitialMetadata(param.server_context->initial_metadata_, |
| param.server_context->initial_metadata_flags()); |
| if (param.server_context->compression_level_set()) { |
| ops.set_compression_level(param.server_context->compression_level()); |
| } |
| if (write_needed_ && status.ok()) { |
| // If we needed a write but never did one, we need to mark the |
| // status as a fail |
| status = Status(StatusCode::INTERNAL, |
| "Service did not provide response message"); |
| } |
| } |
| ops.ServerSendStatus(param.server_context->trailing_metadata_, status); |
| param.call->PerformOps(&ops); |
| param.call->cq()->Pluck(&ops); |
| } |
| |
| private: |
| std::function<Status(ServerContext*, Streamer*)> func_; |
| const bool write_needed_; |
| }; |
| |
| template <class ServiceType, class RequestType, class ResponseType> |
| class BidiStreamingHandler |
| : public TemplatedBidiStreamingHandler< |
| ServerReaderWriter<ResponseType, RequestType>, false> { |
| public: |
| BidiStreamingHandler( |
| std::function<Status(ServiceType*, ServerContext*, |
| ServerReaderWriter<ResponseType, RequestType>*)> |
| func, |
| ServiceType* service) |
| : TemplatedBidiStreamingHandler< |
| ServerReaderWriter<ResponseType, RequestType>, false>(std::bind( |
| func, service, std::placeholders::_1, std::placeholders::_2)) {} |
| }; |
| |
| template <class RequestType, class ResponseType> |
| class StreamedUnaryHandler |
| : public TemplatedBidiStreamingHandler< |
| ServerUnaryStreamer<RequestType, ResponseType>, true> { |
| public: |
| explicit StreamedUnaryHandler( |
| std::function<Status(ServerContext*, |
| ServerUnaryStreamer<RequestType, ResponseType>*)> |
| func) |
| : TemplatedBidiStreamingHandler< |
| ServerUnaryStreamer<RequestType, ResponseType>, true>(func) {} |
| }; |
| |
| template <class RequestType, class ResponseType> |
| class SplitServerStreamingHandler |
| : public TemplatedBidiStreamingHandler< |
| ServerSplitStreamer<RequestType, ResponseType>, false> { |
| public: |
| explicit SplitServerStreamingHandler( |
| std::function<Status(ServerContext*, |
| ServerSplitStreamer<RequestType, ResponseType>*)> |
| func) |
| : TemplatedBidiStreamingHandler< |
| ServerSplitStreamer<RequestType, ResponseType>, false>(func) {} |
| }; |
| |
| // Handle unknown method by returning UNIMPLEMENTED error. |
| class UnknownMethodHandler : public MethodHandler { |
| public: |
| template <class T> |
| static void FillOps(ServerContext* context, T* ops) { |
| Status status(StatusCode::UNIMPLEMENTED, ""); |
| if (!context->sent_initial_metadata_) { |
| ops->SendInitialMetadata(context->initial_metadata_, |
| context->initial_metadata_flags()); |
| if (context->compression_level_set()) { |
| ops->set_compression_level(context->compression_level()); |
| } |
| context->sent_initial_metadata_ = true; |
| } |
| ops->ServerSendStatus(context->trailing_metadata_, status); |
| } |
| |
| void RunHandler(const HandlerParameter& param) final { |
| CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops; |
| FillOps(param.server_context, &ops); |
| param.call->PerformOps(&ops); |
| param.call->cq()->Pluck(&ops); |
| } |
| }; |
| |
| } // namespace grpc |
| |
| #endif // GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H |