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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <chrono>
#include <iostream>
#include <memory>
#include <string>
#include <thread>
#include <utility>
#include "opentelemetry/common/attribute_value.h"
#include "opentelemetry/exporters/otlp/otlp_grpc_metric_exporter_factory.h"
#include "opentelemetry/exporters/otlp/otlp_grpc_metric_exporter_options.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 metric_sdk = opentelemetry::sdk::metrics;
namespace common = opentelemetry::common;
namespace metrics_api = opentelemetry::metrics;
namespace otlp_exporter = opentelemetry::exporter::otlp;
namespace
{
otlp_exporter::OtlpGrpcMetricExporterOptions exporter_options;
void InitMetrics(std::string &name)
{
auto exporter = otlp_exporter::OtlpGrpcMetricExporterFactory::Create(exporter_options);
std::string version{"1.2.0"};
std::string schema{"https://opentelemetry.io/schemas/1.2.0"};
// Initialize and set the global MeterProvider
metric_sdk::PeriodicExportingMetricReaderOptions reader_options;
reader_options.export_interval_millis = std::chrono::milliseconds(1000);
reader_options.export_timeout_millis = std::chrono::milliseconds(500);
auto reader =
metric_sdk::PeriodicExportingMetricReaderFactory::Create(std::move(exporter), reader_options);
auto context = metric_sdk::MeterContextFactory::Create();
context->AddMetricReader(std::move(reader));
auto provider = metric_sdk::MeterProviderFactory::Create(std::move(context));
// histogram view
std::string histogram_name = name + "_exponential_histogram";
std::string unit = "histogram-unit";
auto histogram_instrument_selector = metric_sdk::InstrumentSelectorFactory::Create(
metric_sdk::InstrumentType::kHistogram, histogram_name, unit);
auto histogram_meter_selector = metric_sdk::MeterSelectorFactory::Create(name, version, schema);
auto histogram_aggregation_config =
std::unique_ptr<metric_sdk::Base2ExponentialHistogramAggregationConfig>(
new metric_sdk::Base2ExponentialHistogramAggregationConfig);
std::shared_ptr<metric_sdk::AggregationConfig> aggregation_config(
std::move(histogram_aggregation_config));
auto histogram_view = metric_sdk::ViewFactory::Create(
name, "des", metric_sdk::AggregationType::kBase2ExponentialHistogram, aggregation_config);
provider->AddView(std::move(histogram_instrument_selector), std::move(histogram_meter_selector),
std::move(histogram_view));
std::shared_ptr<opentelemetry::metrics::MeterProvider> api_provider(std::move(provider));
metric_sdk::Provider::SetMeterProvider(api_provider);
}
void CleanupMetrics()
{
std::shared_ptr<metrics_api::MeterProvider> none;
metric_sdk::Provider::SetMeterProvider(none);
}
} // namespace
int main(int argc, char *argv[])
{
std::string example_type;
if (argc > 1)
{
exporter_options.endpoint = argv[1];
if (argc > 2)
{
example_type = argv[2];
if (argc > 3)
{
exporter_options.use_ssl_credentials = true;
exporter_options.ssl_credentials_cacert_path = argv[3];
}
}
}
std::cout << "Using endpoint: " << exporter_options.endpoint << "\n";
std::cout << "Using example type: " << example_type << "\n";
std::cout << "Using cacert path: " << exporter_options.ssl_credentials_cacert_path << "\n";
std::cout << "Using ssl credentials: " << exporter_options.use_ssl_credentials << "\n";
// Removing this line will leave the default noop MetricProvider in place.
std::string name{"otlp_grpc_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
{
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
counter_example.join();
observable_counter_example.join();
histogram_example.join();
histogram_exp_example.join();
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
gauge_example.join();
#endif
}
CleanupMetrics();
return 0;
}
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