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/*
*
* Copyright 2015 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_GENERIC_GENERIC_STUB_H
#define GRPCPP_GENERIC_GENERIC_STUB_H
#include <functional>
#include <grpcpp/client_context.h>
#include <grpcpp/impl/codegen/stub_options.h>
#include <grpcpp/impl/rpc_method.h>
#include <grpcpp/support/async_stream.h>
#include <grpcpp/support/async_unary_call.h>
#include <grpcpp/support/byte_buffer.h>
#include <grpcpp/support/client_callback.h>
#include <grpcpp/support/status.h>
namespace grpc {
class CompletionQueue;
typedef ClientAsyncReaderWriter<ByteBuffer, ByteBuffer>
GenericClientAsyncReaderWriter;
typedef ClientAsyncResponseReader<ByteBuffer> GenericClientAsyncResponseReader;
/// Generic stubs provide a type-unaware interface to call gRPC methods
/// by name. In practice, the Request and Response types should be basic
/// types like grpc::ByteBuffer or proto::MessageLite (the base protobuf).
template <class RequestType, class ResponseType>
class TemplatedGenericStub final {
public:
explicit TemplatedGenericStub(std::shared_ptr<grpc::ChannelInterface> channel)
: channel_(channel) {}
/// Setup a call to a named method \a method using \a context, but don't
/// start it. Let it be started explicitly with StartCall and a tag.
/// The return value only indicates whether or not registration of the call
/// succeeded (i.e. the call won't proceed if the return value is nullptr).
std::unique_ptr<ClientAsyncReaderWriter<RequestType, ResponseType>>
PrepareCall(ClientContext* context, const TString& method,
::grpc::CompletionQueue* cq) {
return CallInternal(channel_.get(), context, method, /*options=*/{}, cq,
false, nullptr);
}
/// Setup a unary call to a named method \a method using \a context, and don't
/// start it. Let it be started explicitly with StartCall.
/// The return value only indicates whether or not registration of the call
/// succeeded (i.e. the call won't proceed if the return value is nullptr).
std::unique_ptr<ClientAsyncResponseReader<ResponseType>> PrepareUnaryCall(
ClientContext* context, const TString& method,
const RequestType& request, ::grpc::CompletionQueue* cq) {
return std::unique_ptr<ClientAsyncResponseReader<ResponseType>>(
internal::ClientAsyncResponseReaderHelper::Create<ResponseType>(
channel_.get(), cq,
grpc::internal::RpcMethod(method.c_str(),
/*suffix_for_stats=*/nullptr,
grpc::internal::RpcMethod::NORMAL_RPC),
context, request));
}
/// DEPRECATED for multi-threaded use
/// Begin a call to a named method \a method using \a context.
/// A tag \a tag will be delivered to \a cq when the call has been started
/// (i.e, initial metadata has been sent).
/// The return value only indicates whether or not registration of the call
/// succeeded (i.e. the call won't proceed if the return value is nullptr).
std::unique_ptr<ClientAsyncReaderWriter<RequestType, ResponseType>> Call(
ClientContext* context, const TString& method,
::grpc::CompletionQueue* cq, void* tag) {
return CallInternal(channel_.get(), context, method, /*options=*/{}, cq,
true, tag);
}
/// Setup and start a unary call to a named method \a method using
/// \a context and specifying the \a request and \a response buffers.
void UnaryCall(ClientContext* context, const TString& method,
StubOptions options, const RequestType* request,
ResponseType* response,
std::function<void(grpc::Status)> on_completion) {
UnaryCallInternal(context, method, options, request, response,
std::move(on_completion));
}
/// Setup a unary call to a named method \a method using
/// \a context and specifying the \a request and \a response buffers.
/// Like any other reactor-based RPC, it will not be activated until
/// StartCall is invoked on its reactor.
void PrepareUnaryCall(ClientContext* context, const TString& method,
StubOptions options, const RequestType* request,
ResponseType* response, ClientUnaryReactor* reactor) {
PrepareUnaryCallInternal(context, method, options, request, response,
reactor);
}
/// Setup a call to a named method \a method using \a context and tied to
/// \a reactor . Like any other bidi streaming RPC, it will not be activated
/// until StartCall is invoked on its reactor.
void PrepareBidiStreamingCall(
ClientContext* context, const TString& method, StubOptions options,
ClientBidiReactor<RequestType, ResponseType>* reactor) {
PrepareBidiStreamingCallInternal(context, method, options, reactor);
}
private:
std::shared_ptr<grpc::ChannelInterface> channel_;
void UnaryCallInternal(ClientContext* context, const TString& method,
StubOptions options, const RequestType* request,
ResponseType* response,
std::function<void(grpc::Status)> on_completion) {
internal::CallbackUnaryCall(
channel_.get(),
grpc::internal::RpcMethod(method.c_str(), options.suffix_for_stats(),
grpc::internal::RpcMethod::NORMAL_RPC),
context, request, response, std::move(on_completion));
}
void PrepareUnaryCallInternal(ClientContext* context,
const TString& method, StubOptions options,
const RequestType* request,
ResponseType* response,
ClientUnaryReactor* reactor) {
internal::ClientCallbackUnaryFactory::Create<RequestType, ResponseType>(
channel_.get(),
grpc::internal::RpcMethod(method.c_str(), options.suffix_for_stats(),
grpc::internal::RpcMethod::NORMAL_RPC),
context, request, response, reactor);
}
void PrepareBidiStreamingCallInternal(
ClientContext* context, const TString& method, StubOptions options,
ClientBidiReactor<RequestType, ResponseType>* reactor) {
internal::ClientCallbackReaderWriterFactory<RequestType, ResponseType>::
Create(channel_.get(),
grpc::internal::RpcMethod(
method.c_str(), options.suffix_for_stats(),
grpc::internal::RpcMethod::BIDI_STREAMING),
context, reactor);
}
std::unique_ptr<ClientAsyncReaderWriter<RequestType, ResponseType>>
CallInternal(grpc::ChannelInterface* channel, ClientContext* context,
const TString& method, StubOptions options,
::grpc::CompletionQueue* cq, bool start, void* tag) {
return std::unique_ptr<ClientAsyncReaderWriter<RequestType, ResponseType>>(
internal::ClientAsyncReaderWriterFactory<RequestType, ResponseType>::
Create(channel, cq,
grpc::internal::RpcMethod(
method.c_str(), options.suffix_for_stats(),
grpc::internal::RpcMethod::BIDI_STREAMING),
context, start, tag));
}
};
typedef TemplatedGenericStub<grpc::ByteBuffer, grpc::ByteBuffer> GenericStub;
} // namespace grpc
#endif // GRPCPP_GENERIC_GENERIC_STUB_H
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