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/*
*
* Copyright 2014, 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
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/cpp/server/server_rpc_handler.h"
#include <grpc/support/log.h>
#include "src/cpp/server/server_context_impl.h"
#include "src/cpp/stream/stream_context.h"
#include <grpc++/async_server_context.h>
#include <grpc++/impl/rpc_service_method.h>
namespace grpc {
ServerRpcHandler::ServerRpcHandler(AsyncServerContext* async_server_context,
RpcServiceMethod* method)
: async_server_context_(async_server_context), method_(method) {}
void ServerRpcHandler::StartRpc() {
if (method_ == nullptr) {
// Method not supported, finish the rpc with error.
// TODO(rocking): do we need to call read to consume the request?
FinishRpc(Status(StatusCode::UNIMPLEMENTED, "No such method."));
return;
}
ServerContextImpl user_context(async_server_context_->absolute_deadline());
if (method_->method_type() == RpcMethod::NORMAL_RPC) {
// Start the rpc on this dedicated completion queue.
async_server_context_->Accept(cq_.cq());
// Allocate request and response.
std::unique_ptr<google::protobuf::Message> request(method_->AllocateRequestProto());
std::unique_ptr<google::protobuf::Message> response(method_->AllocateResponseProto());
// Read request
async_server_context_->StartRead(request.get());
auto type = WaitForNextEvent();
GPR_ASSERT(type == CompletionQueue::SERVER_READ_OK);
// Run the application's rpc handler
MethodHandler* handler = method_->handler();
Status status = handler->RunHandler(MethodHandler::HandlerParameter(
&user_context, request.get(), response.get()));
if (status.IsOk()) {
// Send the response if we get an ok status.
async_server_context_->StartWrite(*response, 0);
type = WaitForNextEvent();
if (type != CompletionQueue::SERVER_WRITE_OK) {
status = Status(StatusCode::INTERNAL, "Error writing response.");
}
}
FinishRpc(status);
} else {
// Allocate request and response.
// TODO(yangg) maybe not allocate both when not needed?
std::unique_ptr<google::protobuf::Message> request(method_->AllocateRequestProto());
std::unique_ptr<google::protobuf::Message> response(method_->AllocateResponseProto());
StreamContext stream_context(*method_, async_server_context_->call(),
cq_.cq(), request.get(), response.get());
// Run the application's rpc handler
MethodHandler* handler = method_->handler();
Status status = handler->RunHandler(MethodHandler::HandlerParameter(
&user_context, request.get(), response.get(), &stream_context));
if (status.IsOk() &&
method_->method_type() == RpcMethod::CLIENT_STREAMING) {
stream_context.Write(response.get(), false);
}
// TODO(yangg) Do we need to consider the status in stream_context?
FinishRpc(status);
}
}
CompletionQueue::CompletionType ServerRpcHandler::WaitForNextEvent() {
void* tag = nullptr;
CompletionQueue::CompletionType type = cq_.Next(&tag);
if (type != CompletionQueue::QUEUE_CLOSED &&
type != CompletionQueue::RPC_END) {
GPR_ASSERT(static_cast<AsyncServerContext*>(tag) ==
async_server_context_.get());
}
return type;
}
void ServerRpcHandler::FinishRpc(const Status& status) {
async_server_context_->StartWriteStatus(status);
CompletionQueue::CompletionType type;
// HALFCLOSE_OK and RPC_END events come in either order.
type = WaitForNextEvent();
GPR_ASSERT(type == CompletionQueue::HALFCLOSE_OK ||
type == CompletionQueue::RPC_END);
type = WaitForNextEvent();
GPR_ASSERT(type == CompletionQueue::HALFCLOSE_OK ||
type == CompletionQueue::RPC_END);
cq_.Shutdown();
type = WaitForNextEvent();
GPR_ASSERT(type == CompletionQueue::QUEUE_CLOSED);
}
} // namespace grpc
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