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/*
*
* Copyright 2015-2016, 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
*/
#include "test/cpp/util/metrics_server.h"
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include "src/proto/grpc/testing/metrics.grpc.pb.h"
#include "src/proto/grpc/testing/metrics.pb.h"
namespace grpc {
namespace testing {
Gauge::Gauge(long initial_val) : val_(initial_val) {}
void Gauge::Set(long new_val) {
std::lock_guard<std::mutex> lock(val_mu_);
val_ = new_val;
}
long Gauge::Get() {
std::lock_guard<std::mutex> lock(val_mu_);
return val_;
}
grpc::Status MetricsServiceImpl::GetAllGauges(
ServerContext* context, const EmptyMessage* request,
ServerWriter<GaugeResponse>* writer) {
gpr_log(GPR_INFO, "GetAllGauges called");
std::lock_guard<std::mutex> lock(mu_);
for (auto it = gauges_.begin(); it != gauges_.end(); it++) {
GaugeResponse resp;
resp.set_name(it->first); // Gauge name
resp.set_long_value(it->second->Get()); // Gauge value
writer->Write(resp);
}
return Status::OK;
}
grpc::Status MetricsServiceImpl::GetGauge(ServerContext* context,
const GaugeRequest* request,
GaugeResponse* response) {
std::lock_guard<std::mutex> lock(mu_);
const auto it = gauges_.find(request->name());
if (it != gauges_.end()) {
response->set_name(it->first);
response->set_long_value(it->second->Get());
}
return Status::OK;
}
std::shared_ptr<Gauge> MetricsServiceImpl::CreateGauge(const grpc::string& name,
bool* already_present) {
std::lock_guard<std::mutex> lock(mu_);
std::shared_ptr<Gauge> gauge(new Gauge(0));
const auto p = gauges_.emplace(name, gauge);
// p.first is an iterator pointing to <name, shared_ptr<Gauge>> pair. p.second
// is a boolean which is set to 'true' if the Gauge is inserted in the guages_
// map and 'false' if it is already present in the map
*already_present = !p.second;
return p.first->second;
}
// Starts the metrics server and returns the grpc::Server instance. Call Wait()
// on the returned server instance.
std::unique_ptr<grpc::Server> MetricsServiceImpl::StartServer(int port) {
gpr_log(GPR_INFO, "Building metrics server..");
const grpc::string address = "0.0.0.0:" + std::to_string(port);
ServerBuilder builder;
builder.AddListeningPort(address, grpc::InsecureServerCredentials());
builder.RegisterService(this);
std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
gpr_log(GPR_INFO, "Metrics server %s started. Ready to receive requests..",
address.c_str());
return server;
}
} // namespace testing
} // namespace grpc
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