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/*
* Copyright 2019 Google LLC
*
* 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.
*/
#include "fcp/client/grpc_bidi_stream.h"
#include <memory>
#include <string>
#include <utility>
#include "absl/status/status.h"
#include "fcp/base/status_converters.h"
#include "fcp/client/grpc_bidi_channel.h"
#include "grpcpp/support/time.h"
namespace fcp {
namespace client {
using fcp::base::FromGrpcStatus;
using google::internal::federatedml::v2::ClientStreamMessage;
using google::internal::federatedml::v2::FederatedTrainingApi;
using google::internal::federatedml::v2::ServerStreamMessage;
using grpc::ChannelInterface;
GrpcBidiStream::GrpcBidiStream(const std::string& target,
const std::string& api_key,
const std::string& population_name,
int64_t grpc_channel_deadline_seconds,
std::string cert_path)
: GrpcBidiStream(GrpcBidiChannel::Create(target, std::move(cert_path)),
api_key, population_name, grpc_channel_deadline_seconds) {}
GrpcBidiStream::GrpcBidiStream(
const std::shared_ptr<grpc::ChannelInterface>& channel,
const std::string& api_key, const std::string& population_name,
int64_t grpc_channel_deadline_seconds)
: mu_(), stub_(FederatedTrainingApi::NewStub(channel)) {
FCP_LOG(INFO) << "Connecting to stub: " << stub_.get();
gpr_timespec deadline = gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_seconds(grpc_channel_deadline_seconds, GPR_TIMESPAN));
client_context_.set_deadline(deadline);
client_context_.AddMetadata(kApiKeyHeader, api_key);
client_context_.AddMetadata(kPopulationNameHeader, population_name);
client_reader_writer_ = stub_->Session(&client_context_);
GrpcChunkedBidiStream<ClientStreamMessage,
ServerStreamMessage>::GrpcChunkedBidiStreamOptions
options;
chunked_bidi_stream_ = std::make_unique<
GrpcChunkedBidiStream<ClientStreamMessage, ServerStreamMessage>>(
client_reader_writer_.get(), client_reader_writer_.get(), options);
if (!channel) Close();
}
absl::Status GrpcBidiStream::Send(ClientStreamMessage* message) {
absl::Status status;
{
absl::MutexLock _(&mu_);
if (client_reader_writer_ == nullptr) {
return absl::CancelledError(
"Send failed because GrpcBidiStream was closed.");
}
status = chunked_bidi_stream_->Send(message);
if (status.code() == absl::StatusCode::kAborted) {
FCP_LOG(INFO) << "Send aborted: " << status.code();
auto finish_status = FromGrpcStatus(client_reader_writer_->Finish());
// If the connection aborts early or harshly enough, there will be no
// error status from Finish().
if (!finish_status.ok()) status = finish_status;
}
}
if (!status.ok()) {
FCP_LOG(INFO) << "Closing; error on send: " << status.message();
Close();
}
return status;
}
absl::Status GrpcBidiStream::Receive(ServerStreamMessage* message) {
absl::Status status;
{
absl::MutexLock _(&mu_);
if (client_reader_writer_ == nullptr) {
return absl::CancelledError(
"Receive failed because GrpcBidiStream was closed.");
}
status = chunked_bidi_stream_->Receive(message);
if (status.code() == absl::StatusCode::kAborted) {
FCP_LOG(INFO) << "Receive aborted: " << status.code();
auto finish_status = FromGrpcStatus(client_reader_writer_->Finish());
// If the connection aborts early or harshly enough, there will be no
// error status from Finish().
if (!finish_status.ok()) status = finish_status;
}
}
if (!status.ok()) {
FCP_LOG(INFO) << "Closing; error on receive: " << status.message();
Close();
}
return status;
}
void GrpcBidiStream::Close() {
if (!mu_.TryLock()) {
client_context_.TryCancel();
mu_.Lock();
}
chunked_bidi_stream_->Close();
if (client_reader_writer_) client_reader_writer_->WritesDone();
client_reader_writer_.reset();
FCP_LOG(INFO) << "Closing stub: " << stub_.get();
stub_.reset();
mu_.Unlock();
}
int64_t GrpcBidiStream::ChunkingLayerBytesReceived() {
absl::MutexLock _(&mu_);
return chunked_bidi_stream_->ChunkingLayerBytesReceived();
}
int64_t GrpcBidiStream::ChunkingLayerBytesSent() {
absl::MutexLock _(&mu_);
return chunked_bidi_stream_->ChunkingLayerBytesSent();
}
} // namespace client
} // namespace fcp
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