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//
// Copyright 2022 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_EXT_ORCA_SERVICE_H
#define GRPCPP_EXT_ORCA_SERVICE_H
#include <map>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include "y_absl/time/time.h"
#include "y_absl/types/optional.h"
#include <grpcpp/ext/server_metric_recorder.h>
#include <grpcpp/impl/service_type.h>
#include <grpcpp/impl/sync.h>
#include <grpcpp/server_builder.h>
#include <grpcpp/support/server_callback.h>
#include <grpcpp/support/slice.h>
namespace grpc {
namespace experimental {
// RPC service implementation for supplying out-of-band backend
// utilization metrics to clients.
class OrcaService : public Service {
public:
struct Options {
// Minimum report interval. If a client requests an interval lower
// than this value, this value will be used instead.
y_absl::Duration min_report_duration = y_absl::Seconds(30);
Options() = default;
Options& set_min_report_duration(y_absl::Duration duration) {
min_report_duration = duration;
return *this;
}
};
// ServerMetricRecorder is required.
OrcaService(ServerMetricRecorder* const server_metric_recorder,
Options options);
private:
class Reactor;
Slice GetOrCreateSerializedResponse();
const ServerMetricRecorder* const server_metric_recorder_;
const y_absl::Duration min_report_duration_;
grpc::internal::Mutex mu_;
// Contains the last serialized metrics from server_metric_recorder_.
y_absl::optional<Slice> response_slice_ Y_ABSL_GUARDED_BY(mu_);
// The update sequence number of metrics serialized in response_slice_.
y_absl::optional<uint64_t> response_slice_seq_ Y_ABSL_GUARDED_BY(mu_);
};
} // namespace experimental
} // namespace grpc
#endif // GRPCPP_EXT_ORCA_SERVICE_H
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