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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <stdint.h>
#include <chrono>
#include <map>
#include <new>
#include <utility>
#include "opentelemetry/common/key_value_iterable.h"
#include "opentelemetry/context/context.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/variant.h"
#include "opentelemetry/sdk/instrumentationscope/instrumentation_scope.h"
#include "opentelemetry/sdk/instrumentationscope/scope_configurator.h"
#include "opentelemetry/sdk/trace/id_generator.h"
#include "opentelemetry/sdk/trace/sampler.h"
#include "opentelemetry/sdk/trace/tracer.h"
#include "opentelemetry/sdk/trace/tracer_config.h"
#include "opentelemetry/sdk/trace/tracer_context.h"
#include "opentelemetry/trace/context.h"
#include "opentelemetry/trace/noop.h"
#include "opentelemetry/trace/span.h"
#include "opentelemetry/trace/span_context.h"
#include "opentelemetry/trace/span_context_kv_iterable.h"
#include "opentelemetry/trace/span_id.h"
#include "opentelemetry/trace/span_startoptions.h"
#include "opentelemetry/trace/trace_flags.h"
#include "opentelemetry/trace/trace_id.h"
#include "opentelemetry/trace/trace_state.h"
#include "opentelemetry/version.h"
#include "src/trace/span.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace trace
{
const std::shared_ptr<opentelemetry::trace::NoopTracer> Tracer::kNoopTracer =
std::make_shared<opentelemetry::trace::NoopTracer>();
Tracer::Tracer(std::shared_ptr<TracerContext> context,
std::unique_ptr<InstrumentationScope> instrumentation_scope) noexcept
: instrumentation_scope_{std::move(instrumentation_scope)},
context_{std::move(context)},
tracer_config_(context_->GetTracerConfigurator().ComputeConfig(*instrumentation_scope_))
{
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
UpdateEnabled(tracer_config_.IsEnabled());
#endif
}
nostd::shared_ptr<opentelemetry::trace::Span> Tracer::StartSpan(
nostd::string_view name,
const opentelemetry::common::KeyValueIterable &attributes,
const opentelemetry::trace::SpanContextKeyValueIterable &links,
const opentelemetry::trace::StartSpanOptions &options) noexcept
{
if (!tracer_config_.IsEnabled())
{
return kNoopTracer->StartSpan(name, attributes, links, options);
}
// make sure to always overwrite this parent_context
bool get_current_context = true;
opentelemetry::trace::SpanContext parent_context(false, false);
if (const opentelemetry::trace::SpanContext *span_context =
nostd::get_if<opentelemetry::trace::SpanContext>(&options.parent))
{
if (span_context->IsValid())
{
parent_context = *span_context;
get_current_context = false;
}
}
else if (const context::Context *context = nostd::get_if<context::Context>(&options.parent))
{
// fetch span context from parent span stored in the context
auto parent_span_context = opentelemetry::trace::GetSpan(*context)->GetContext();
if (parent_span_context.IsValid())
{
parent_context = parent_span_context;
get_current_context = false;
}
else
{
if (opentelemetry::trace::IsRootSpan(*context))
{
get_current_context = false;
}
}
}
if (get_current_context)
{
parent_context = GetCurrentSpan()->GetContext();
}
IdGenerator &generator = GetIdGenerator();
opentelemetry::trace::TraceId trace_id;
opentelemetry::trace::SpanId span_id = generator.GenerateSpanId();
bool is_parent_span_valid = false;
uint8_t flags = 0;
if (parent_context.IsValid())
{
trace_id = parent_context.trace_id();
flags = parent_context.trace_flags().flags();
is_parent_span_valid = true;
}
else
{
trace_id = generator.GenerateTraceId();
if (generator.IsRandom())
{
flags = opentelemetry::trace::TraceFlags::kIsRandom;
}
}
auto sampling_result = context_->GetSampler().ShouldSample(parent_context, trace_id, name,
options.kind, attributes, links);
if (sampling_result.IsSampled())
{
flags |= opentelemetry::trace::TraceFlags::kIsSampled;
}
else
{
flags &= ~opentelemetry::trace::TraceFlags::kIsSampled;
}
#if 0
/* https://github.com/open-telemetry/opentelemetry-specification as of v1.29.0 */
/* Support W3C Trace Context version 1. */
flags &= opentelemetry::trace::TraceFlags::kAllW3CTraceContext1Flags;
#endif
#if 1
/* Waiting for https://github.com/open-telemetry/opentelemetry-specification/issues/3411 */
/* Support W3C Trace Context version 2. */
flags &= opentelemetry::trace::TraceFlags::kAllW3CTraceContext2Flags;
#endif
opentelemetry::trace::TraceFlags trace_flags(flags);
auto span_context =
std::unique_ptr<opentelemetry::trace::SpanContext>(new opentelemetry::trace::SpanContext(
trace_id, span_id, trace_flags, false,
sampling_result.trace_state ? sampling_result.trace_state
: is_parent_span_valid ? parent_context.trace_state()
: opentelemetry::trace::TraceState::GetDefault()));
if (!sampling_result.IsRecording())
{
// create no-op span with valid span-context.
auto noop_span = nostd::shared_ptr<opentelemetry::trace::Span>{
new (std::nothrow)
opentelemetry::trace::NoopSpan(this->shared_from_this(), std::move(span_context))};
return noop_span;
}
else
{
auto span = nostd::shared_ptr<opentelemetry::trace::Span>{
new (std::nothrow) Span{this->shared_from_this(), name, attributes, links, options,
parent_context, std::move(span_context)}};
// if the attributes is not nullptr, add attributes to the span.
if (sampling_result.attributes)
{
for (auto &kv : *sampling_result.attributes)
{
span->SetAttribute(kv.first, kv.second);
}
}
return span;
}
}
void Tracer::ForceFlushWithMicroseconds(uint64_t timeout) noexcept
{
if (context_)
{
context_->ForceFlush(
std::chrono::microseconds{static_cast<std::chrono::microseconds::rep>(timeout)});
}
}
void Tracer::CloseWithMicroseconds(uint64_t timeout) noexcept
{
// Trace context is shared by many tracers.So we just call ForceFlush to flush all pending spans
// and do not shutdown it.
if (context_)
{
context_->ForceFlush(
std::chrono::microseconds{static_cast<std::chrono::microseconds::rep>(timeout)});
}
}
} // namespace trace
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
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