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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <chrono>
#include <memory>
#include <string>
#include <thread>
#include <utility>
#include <vector>
#include "opentelemetry/common/attribute_value.h"
#include "opentelemetry/exporters/ostream/metric_exporter_factory.h"
#include "opentelemetry/metrics/meter_provider.h"
#include "opentelemetry/sdk/metrics/aggregation/aggregation_config.h"
#include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_factory.h"
#include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_options.h"
#include "opentelemetry/sdk/metrics/instruments.h"
#include "opentelemetry/sdk/metrics/meter_context.h"
#include "opentelemetry/sdk/metrics/meter_context_factory.h"
#include "opentelemetry/sdk/metrics/meter_provider.h"
#include "opentelemetry/sdk/metrics/meter_provider_factory.h"
#include "opentelemetry/sdk/metrics/metric_reader.h"
#include "opentelemetry/sdk/metrics/provider.h"
#include "opentelemetry/sdk/metrics/push_metric_exporter.h"
#include "opentelemetry/sdk/metrics/view/instrument_selector.h"
#include "opentelemetry/sdk/metrics/view/instrument_selector_factory.h"
#include "opentelemetry/sdk/metrics/view/meter_selector.h"
#include "opentelemetry/sdk/metrics/view/meter_selector_factory.h"
#include "opentelemetry/sdk/metrics/view/view.h"
#include "opentelemetry/sdk/metrics/view/view_factory.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 common = opentelemetry::common;
namespace exportermetrics = opentelemetry::exporter::metrics;
namespace metrics_api = opentelemetry::metrics;
namespace
{
void InitMetrics(const std::string &name)
{
auto exporter = exportermetrics::OStreamMetricExporterFactory::Create();
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);
auto reader =
metrics_sdk::PeriodicExportingMetricReaderFactory::Create(std::move(exporter), options);
auto context = metrics_sdk::MeterContextFactory::Create();
context->AddMetricReader(std::move(reader));
auto provider = opentelemetry::sdk::metrics::MeterProviderFactory::Create(std::move(context));
// counter view
std::string counter_name = name + "_counter";
std::string unit = "counter-unit";
auto instrument_selector = metrics_sdk::InstrumentSelectorFactory::Create(
metrics_sdk::InstrumentType::kCounter, counter_name, unit);
auto meter_selector = metrics_sdk::MeterSelectorFactory::Create(name, version, schema);
auto sum_view =
metrics_sdk::ViewFactory::Create(name, "description", metrics_sdk::AggregationType::kSum);
provider->AddView(std::move(instrument_selector), std::move(meter_selector), std::move(sum_view));
// observable counter view
std::string observable_counter_name = name + "_observable_counter";
auto observable_instrument_selector = metrics_sdk::InstrumentSelectorFactory::Create(
metrics_sdk::InstrumentType::kObservableCounter, observable_counter_name, unit);
auto observable_meter_selector = metrics_sdk::MeterSelectorFactory::Create(name, version, schema);
auto observable_sum_view = metrics_sdk::ViewFactory::Create(name, "test_description",
metrics_sdk::AggregationType::kSum);
provider->AddView(std::move(observable_instrument_selector), std::move(observable_meter_selector),
std::move(observable_sum_view));
// histogram view
std::string histogram_name = name + "_histogram";
unit = "histogram-unit";
auto histogram_instrument_selector = metrics_sdk::InstrumentSelectorFactory::Create(
metrics_sdk::InstrumentType::kHistogram, histogram_name, unit);
auto histogram_meter_selector = metrics_sdk::MeterSelectorFactory::Create(name, version, schema);
auto histogram_aggregation_config = std::unique_ptr<metrics_sdk::HistogramAggregationConfig>(
new metrics_sdk::HistogramAggregationConfig);
histogram_aggregation_config->boundaries_ = std::vector<double>{
0.0, 50.0, 100.0, 250.0, 500.0, 750.0, 1000.0, 2500.0, 5000.0, 10000.0, 20000.0};
std::shared_ptr<metrics_sdk::AggregationConfig> aggregation_config(
std::move(histogram_aggregation_config));
auto histogram_view = metrics_sdk::ViewFactory::Create(
name, "description", metrics_sdk::AggregationType::kHistogram, aggregation_config);
provider->AddView(std::move(histogram_instrument_selector), std::move(histogram_meter_selector),
std::move(histogram_view));
// hisogram view with base2 exponential aggregation
std::string histogram_base2_name = name + "_exponential_histogram";
unit = "histogram-unit";
auto histogram_base2_instrument_selector = metrics_sdk::InstrumentSelectorFactory::Create(
metrics_sdk::InstrumentType::kHistogram, histogram_base2_name, unit);
auto histogram_base2_meter_selector =
metrics_sdk::MeterSelectorFactory::Create(name, version, schema);
auto histogram_base2_aggregation_config =
std::unique_ptr<metrics_sdk::Base2ExponentialHistogramAggregationConfig>(
new metrics_sdk::Base2ExponentialHistogramAggregationConfig);
histogram_base2_aggregation_config->max_scale_ = 3;
histogram_base2_aggregation_config->record_min_max_ = true;
histogram_base2_aggregation_config->max_buckets_ = 100;
std::shared_ptr<metrics_sdk::AggregationConfig> base2_aggregation_config(
std::move(histogram_base2_aggregation_config));
auto histogram_base2_view = metrics_sdk::ViewFactory::Create(
name, "description", metrics_sdk::AggregationType::kBase2ExponentialHistogram,
base2_aggregation_config);
provider->AddView(std::move(histogram_base2_instrument_selector),
std::move(histogram_base2_meter_selector), std::move(histogram_base2_view));
std::shared_ptr<opentelemetry::metrics::MeterProvider> api_provider(std::move(provider));
metrics_sdk::Provider::SetMeterProvider(api_provider);
}
void CleanupMetrics()
{
std::shared_ptr<metrics_api::MeterProvider> none;
metrics_sdk::Provider::SetMeterProvider(none);
}
} // namespace
int main(int argc, char **argv)
{
std::string example_type;
if (argc >= 2)
{
example_type = argv[1];
}
std::string name{"ostream_metric_example"};
InitMetrics(name);
if (example_type == "counter")
{
foo_library::counter_example(name);
}
else if (example_type == "observable_counter")
{
foo_library::observable_counter_example(name);
}
else if (example_type == "histogram")
{
foo_library::histogram_example(name);
}
else if (example_type == "exponential_histogram")
{
foo_library::histogram_exp_example(name);
}
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
else if (example_type == "gauge")
{
foo_library::gauge_example(name);
}
#endif
else if (example_type == "semconv_counter")
{
foo_library::semconv_counter_example();
}
else if (example_type == "semconv_observable_counter")
{
foo_library::semconv_observable_counter_example();
}
else if (example_type == "semconv_histogram")
{
foo_library::semconv_histogram_example();
}
else
{
std::thread counter_example{&foo_library::counter_example, name};
std::thread observable_counter_example{&foo_library::observable_counter_example, name};
std::thread histogram_example{&foo_library::histogram_example, name};
std::thread histogram_exp_example{&foo_library::histogram_exp_example, name};
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
std::thread gauge_example{&foo_library::gauge_example, name};
#endif
std::thread semconv_counter_example{&foo_library::semconv_counter_example};
std::thread semconv_observable_counter_example{
&foo_library::semconv_observable_counter_example};
std::thread semconv_histogram_example{&foo_library::semconv_histogram_example};
counter_example.join();
observable_counter_example.join();
histogram_example.join();
histogram_exp_example.join();
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
gauge_example.join();
#endif
semconv_counter_example.join();
semconv_observable_counter_example.join();
semconv_histogram_example.join();
}
CleanupMetrics();
return 0;
}
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