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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <atomic>
#include <chrono>
#include <memory>
#include <mutex>
#include <ostream>
#include <utility>
#include <vector>
#include "opentelemetry/common/spin_lock_mutex.h"
#include "opentelemetry/common/timestamp.h"
#include "opentelemetry/nostd/function_ref.h"
#include "opentelemetry/nostd/span.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/sdk/common/global_log_handler.h"
#include "opentelemetry/sdk/instrumentationscope/instrumentation_scope.h"
#include "opentelemetry/sdk/instrumentationscope/scope_configurator.h"
#include "opentelemetry/sdk/metrics/export/metric_filter.h"
#include "opentelemetry/sdk/metrics/meter.h"
#include "opentelemetry/sdk/metrics/meter_config.h"
#include "opentelemetry/sdk/metrics/meter_context.h"
#include "opentelemetry/sdk/metrics/metric_reader.h"
#include "opentelemetry/sdk/metrics/state/metric_collector.h"
#include "opentelemetry/sdk/metrics/view/instrument_selector.h"
#include "opentelemetry/sdk/metrics/view/meter_selector.h"
#include "opentelemetry/sdk/metrics/view/view.h"
#include "opentelemetry/sdk/metrics/view/view_registry.h"
#include "opentelemetry/sdk/resource/resource.h"
#include "opentelemetry/version.h"
#ifdef ENABLE_METRICS_EXEMPLAR_PREVIEW
# include "opentelemetry/sdk/metrics/exemplar/filter_type.h"
#endif // ENABLE_METRICS_EXEMPLAR_PREVIEW
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
MeterContext::MeterContext(std::unique_ptr<ViewRegistry> views,
const opentelemetry::sdk::resource::Resource &resource,
std::unique_ptr<instrumentationscope::ScopeConfigurator<MeterConfig>>
meter_configurator) noexcept
: resource_{resource},
views_(std::move(views)),
sdk_start_ts_{std::chrono::system_clock::now()},
meter_configurator_(std::move(meter_configurator))
{}
const resource::Resource &MeterContext::GetResource() const noexcept
{
return resource_;
}
ViewRegistry *MeterContext::GetViewRegistry() const noexcept
{
return views_.get();
}
const instrumentationscope::ScopeConfigurator<MeterConfig> &MeterContext::GetMeterConfigurator()
const noexcept
{
return *meter_configurator_;
}
bool MeterContext::ForEachMeter(
nostd::function_ref<bool(std::shared_ptr<Meter> &meter)> callback) noexcept
{
std::lock_guard<opentelemetry::common::SpinLockMutex> guard(meter_lock_);
for (auto &meter : meters_)
{
if (!callback(meter))
{
return false;
}
}
return true;
}
nostd::span<std::shared_ptr<Meter>> MeterContext::GetMeters() noexcept
{
// no lock required, as this is called by MeterProvider in thread-safe manner.
return nostd::span<std::shared_ptr<Meter>>{meters_.data(), meters_.size()};
}
nostd::span<std::shared_ptr<CollectorHandle>> MeterContext::GetCollectors() noexcept
{
return nostd::span<std::shared_ptr<CollectorHandle>>(collectors_.data(), collectors_.size());
}
opentelemetry::common::SystemTimestamp MeterContext::GetSDKStartTime() noexcept
{
return sdk_start_ts_;
}
void MeterContext::AddMetricReader(std::shared_ptr<MetricReader> reader,
std::unique_ptr<MetricFilter> metric_filter) noexcept
{
auto collector = std::shared_ptr<MetricCollector>{
new MetricCollector(this, std::move(reader), std::move(metric_filter))};
collectors_.push_back(collector);
}
void MeterContext::AddView(std::unique_ptr<InstrumentSelector> instrument_selector,
std::unique_ptr<MeterSelector> meter_selector,
std::unique_ptr<View> view) noexcept
{
views_->AddView(std::move(instrument_selector), std::move(meter_selector), std::move(view));
}
#ifdef ENABLE_METRICS_EXEMPLAR_PREVIEW
void MeterContext::SetExemplarFilter(metrics::ExemplarFilterType exemplar_filter_type) noexcept
{
exemplar_filter_type_ = exemplar_filter_type;
}
ExemplarFilterType MeterContext::GetExemplarFilter() const noexcept
{
return exemplar_filter_type_;
}
#endif // ENABLE_METRICS_EXEMPLAR_PREVIEW
void MeterContext::AddMeter(const std::shared_ptr<Meter> &meter)
{
std::lock_guard<opentelemetry::common::SpinLockMutex> guard(meter_lock_);
meters_.push_back(meter);
}
void MeterContext::RemoveMeter(nostd::string_view name,
nostd::string_view version,
nostd::string_view schema_url)
{
std::lock_guard<opentelemetry::common::SpinLockMutex> guard(meter_lock_);
std::vector<std::shared_ptr<Meter>> filtered_meters;
for (auto &meter : meters_)
{
auto scope = meter->GetInstrumentationScope();
if (scope->equal(name, version, schema_url))
{
OTEL_INTERNAL_LOG_INFO("[MeterContext::RemoveMeter] removing meter name <"
<< name << ">, version <" << version << ">, URL <" << schema_url
<< ">");
}
else
{
filtered_meters.push_back(meter);
}
}
meters_.swap(filtered_meters);
}
bool MeterContext::Shutdown(std::chrono::microseconds timeout) noexcept
{
bool result = true;
// Shutdown only once.
if (!shutdown_latch_.test_and_set(std::memory_order_acquire))
{
for (auto &collector : collectors_)
{
bool status = std::static_pointer_cast<MetricCollector>(collector)->Shutdown(timeout);
result = result && status;
}
if (!result)
{
OTEL_INTERNAL_LOG_WARN("[MeterContext::Shutdown] Unable to shutdown all metric readers");
}
}
else
{
OTEL_INTERNAL_LOG_WARN("[MeterContext::Shutdown] Shutdown can be invoked only once.");
}
return result;
}
bool MeterContext::ForceFlush(std::chrono::microseconds timeout) noexcept
{
bool result = true;
// Simultaneous flush not allowed.
const std::lock_guard<opentelemetry::common::SpinLockMutex> locked(forceflush_lock_);
auto time_remaining = (std::chrono::steady_clock::duration::max)();
if (std::chrono::duration_cast<std::chrono::microseconds>(time_remaining) > timeout)
{
time_remaining = timeout;
}
auto current_time = std::chrono::steady_clock::now();
auto expire_time = (std::chrono::steady_clock::time_point::max)();
if (expire_time - current_time > time_remaining)
{
expire_time = current_time + time_remaining;
}
for (auto &collector : collectors_)
{
if (!std::static_pointer_cast<MetricCollector>(collector)->ForceFlush(
std::chrono::duration_cast<std::chrono::microseconds>(time_remaining)))
{
result = false;
}
current_time = std::chrono::steady_clock::now();
if (expire_time >= current_time)
{
time_remaining = expire_time - current_time;
}
else
{
time_remaining = std::chrono::steady_clock::duration::zero();
}
}
if (!result)
{
OTEL_INTERNAL_LOG_WARN("[MeterContext::ForceFlush] Unable to ForceFlush all metric readers");
}
return result;
}
} // namespace metrics
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
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