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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#ifndef ENABLE_METRICS_PREVIEW
# include <memory>
# include <thread>
# include "opentelemetry/exporters/prometheus/exporter.h"
# include "opentelemetry/metrics/provider.h"
# include "opentelemetry/sdk/metrics/aggregation/default_aggregation.h"
# include "opentelemetry/sdk/metrics/aggregation/histogram_aggregation.h"
# include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader.h"
# include "opentelemetry/sdk/metrics/meter.h"
# include "opentelemetry/sdk/metrics/meter_provider.h"
# ifdef BAZEL_BUILD
# include "examples/common/metrics_foo_library/foo_library.h"
# else
# include "metrics_foo_library/foo_library.h"
# endif
namespace metrics_sdk = opentelemetry::sdk::metrics;
namespace nostd = opentelemetry::nostd;
namespace common = opentelemetry::common;
namespace metrics_exporter = opentelemetry::exporter::metrics;
namespace metrics_api = opentelemetry::metrics;
namespace
{
void initMetrics(const std::string &name, const std::string &addr)
{
metrics_exporter::PrometheusExporterOptions opts;
if (!addr.empty())
{
opts.url = addr;
}
std::puts("PrometheusExporter example program running ...");
std::unique_ptr<metrics_sdk::MetricExporter> exporter{
new metrics_exporter::PrometheusExporter(opts)};
std::string version{"1.2.0"};
std::string schema{"https://opentelemetry.io/schemas/1.2.0"};
// Initialize and set the global MeterProvider
metrics_sdk::PeriodicExportingMetricReaderOptions options;
options.export_interval_millis = std::chrono::milliseconds(1000);
options.export_timeout_millis = std::chrono::milliseconds(500);
std::unique_ptr<metrics_sdk::MetricReader> reader{
new metrics_sdk::PeriodicExportingMetricReader(std::move(exporter), options)};
auto provider = std::shared_ptr<metrics_api::MeterProvider>(new metrics_sdk::MeterProvider());
auto p = std::static_pointer_cast<metrics_sdk::MeterProvider>(provider);
p->AddMetricReader(std::move(reader));
// counter view
std::string counter_name = name + "_counter";
std::unique_ptr<metrics_sdk::InstrumentSelector> instrument_selector{
new metrics_sdk::InstrumentSelector(metrics_sdk::InstrumentType::kCounter, counter_name)};
std::unique_ptr<metrics_sdk::MeterSelector> meter_selector{
new metrics_sdk::MeterSelector(name, version, schema)};
std::unique_ptr<metrics_sdk::View> sum_view{
new metrics_sdk::View{name, "description", metrics_sdk::AggregationType::kSum}};
p->AddView(std::move(instrument_selector), std::move(meter_selector), std::move(sum_view));
// histogram view
std::string histogram_name = name + "_histogram";
std::unique_ptr<metrics_sdk::InstrumentSelector> histogram_instrument_selector{
new metrics_sdk::InstrumentSelector(metrics_sdk::InstrumentType::kHistogram, histogram_name)};
std::unique_ptr<metrics_sdk::MeterSelector> histogram_meter_selector{
new metrics_sdk::MeterSelector(name, version, schema)};
std::unique_ptr<metrics_sdk::View> histogram_view{
new metrics_sdk::View{name, "description", metrics_sdk::AggregationType::kHistogram}};
p->AddView(std::move(histogram_instrument_selector), std::move(histogram_meter_selector),
std::move(histogram_view));
metrics_api::Provider::SetMeterProvider(provider);
}
} // namespace
int main(int argc, char **argv)
{
std::string example_type;
std::string addr{"localhost:8080"};
if (argc == 1)
{
std::puts("usage: $prometheus_example <example type> <url>");
}
if (argc >= 2)
{
example_type = argv[1];
}
if (argc > 2)
{
addr = argv[2];
}
std::string name{"prometheus_metric_example"};
initMetrics(name, addr);
if (example_type == "counter")
{
foo_library::counter_example(name);
}
else if (example_type == "histogram")
{
foo_library::histogram_example(name);
}
else
{
std::thread counter_example{&foo_library::counter_example, name};
std::thread histogram_example{&foo_library::histogram_example, name};
counter_example.join();
histogram_example.join();
}
}
#else
int main() {}
#endif
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