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/*
*
* Copyright 2015, 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.
*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 GRPC_FINAL : public MetricsService::Service {
public:
grpc::Status GetAllGauges(ServerContext* context, const EmptyMessage* request,
ServerWriter<GaugeResponse>* writer) GRPC_OVERRIDE;
grpc::Status GetGauge(ServerContext* context, const GaugeRequest* request,
GaugeResponse* response) GRPC_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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