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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include <cstring>
#include <iostream>
#include <vector>
#include "opentelemetry/context/propagation/global_propagator.h"
#include "opentelemetry/context/propagation/text_map_propagator.h"
#include "opentelemetry/exporters/ostream/span_exporter_factory.h"
#include "opentelemetry/ext/http/client/http_client.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/sdk/trace/exporter.h"
#include "opentelemetry/sdk/trace/processor.h"
#include "opentelemetry/sdk/trace/provider.h"
#include "opentelemetry/sdk/trace/simple_processor_factory.h"
#include "opentelemetry/sdk/trace/tracer_context.h"
#include "opentelemetry/sdk/trace/tracer_context_factory.h"
#include "opentelemetry/sdk/trace/tracer_provider_factory.h"
#include "opentelemetry/trace/propagation/http_trace_context.h"
#include "opentelemetry/trace/provider.h"
namespace
{
template <typename T>
class HttpTextMapCarrier : public opentelemetry::context::propagation::TextMapCarrier
{
public:
HttpTextMapCarrier(T &headers) : headers_(headers) {}
HttpTextMapCarrier() = default;
virtual opentelemetry::nostd::string_view Get(
opentelemetry::nostd::string_view key) const noexcept override
{
std::string key_to_compare = key.data();
// Header's first letter seems to be automatically capitaliazed by our test http-server, so
// compare accordingly.
if (key == opentelemetry::trace::propagation::kTraceParent)
{
key_to_compare = "Traceparent";
}
else if (key == opentelemetry::trace::propagation::kTraceState)
{
key_to_compare = "Tracestate";
}
auto it = headers_.find(key_to_compare);
if (it != headers_.end())
{
return it->second;
}
return "";
}
virtual void Set(opentelemetry::nostd::string_view key,
opentelemetry::nostd::string_view value) noexcept override
{
headers_.insert(std::pair<std::string, std::string>(std::string(key), std::string(value)));
}
T headers_;
};
void InitTracer()
{
auto exporter = opentelemetry::exporter::trace::OStreamSpanExporterFactory::Create();
auto processor =
opentelemetry::sdk::trace::SimpleSpanProcessorFactory::Create(std::move(exporter));
std::vector<std::unique_ptr<opentelemetry::sdk::trace::SpanProcessor>> processors;
processors.push_back(std::move(processor));
// Default is an always-on sampler.
std::unique_ptr<opentelemetry::sdk::trace::TracerContext> context =
opentelemetry::sdk::trace::TracerContextFactory::Create(std::move(processors));
std::shared_ptr<opentelemetry::trace::TracerProvider> provider =
opentelemetry::sdk::trace::TracerProviderFactory::Create(std::move(context));
// Set the global trace provider
opentelemetry::sdk::trace::Provider::SetTracerProvider(provider);
// set global propagator
opentelemetry::context::propagation::GlobalTextMapPropagator::SetGlobalPropagator(
opentelemetry::nostd::shared_ptr<opentelemetry::context::propagation::TextMapPropagator>(
new opentelemetry::trace::propagation::HttpTraceContext()));
}
void CleanupTracer()
{
std::shared_ptr<opentelemetry::trace::TracerProvider> none;
opentelemetry::sdk::trace::Provider::SetTracerProvider(none);
}
opentelemetry::nostd::shared_ptr<opentelemetry::trace::Tracer> get_tracer(std::string tracer_name)
{
auto provider = opentelemetry::trace::Provider::GetTracerProvider();
return provider->GetTracer(tracer_name);
}
} // namespace
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