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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.
*is % allowed in string
*/
#ifndef GRPC_TEST_CPP_METRICS_SERVER_H
#define GRPC_TEST_CPP_METRICS_SERVER_H
#include <map>
#include <mutex>
#include "src/proto/grpc/testing/metrics.grpc.pb.h"
#include "src/proto/grpc/testing/metrics.pb.h"
/*
* This implements a Metrics server defined in
* src/proto/grpc/testing/metrics.proto. Any
* test service can use this to export Metrics (TODO (sreek): Only Gauges for
* now).
*
* Example:
* MetricsServiceImpl metricsImpl;
* ..
* // Create QpsGauge(s). Note: QpsGauges can be created even after calling
* // 'StartServer'.
* QpsGauge qps_gauge1 = metricsImpl.CreateQpsGauge("foo", is_present);
* // qps_gauge1 can now be used anywhere in the program by first making a
* // one-time call qps_gauge1.Reset() and then calling qps_gauge1.Incr()
* // every time to increment a query counter
*
* ...
* // Create the metrics server
* std::unique_ptr<grpc::Server> server = metricsImpl.StartServer(port);
* server->Wait(); // Note: This is blocking.
*/
namespace grpc {
namespace testing {
class QpsGauge {
public:
QpsGauge();
// Initialize the internal timer and reset the query count to 0
void Reset();
// Increment the query count by 1
void Incr();
// Return the current qps (i.e query count divided by the time since this
// QpsGauge object created (or Reset() was called))
long Get();
private:
gpr_timespec start_time_;
long num_queries_;
std::mutex num_queries_mu_;
};
class MetricsServiceImpl final : public MetricsService::Service {
public:
grpc::Status GetAllGauges(ServerContext* context, const EmptyMessage* request,
ServerWriter<GaugeResponse>* writer) override;
grpc::Status GetGauge(ServerContext* context, const GaugeRequest* request,
GaugeResponse* response) override;
// Create a QpsGauge with name 'name'. is_present is set to true if the Gauge
// is already present in the map.
// NOTE: CreateQpsGauge can be called anytime (i.e before or after calling
// StartServer).
std::shared_ptr<QpsGauge> CreateQpsGauge(const grpc::string& name,
bool* already_present);
std::unique_ptr<grpc::Server> StartServer(int port);
private:
std::map<string, std::shared_ptr<QpsGauge>> qps_gauges_;
std::mutex mu_;
};
} // namespace testing
} // namespace grpc
#endif // GRPC_TEST_CPP_METRICS_SERVER_H
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