tracer.hpp

#pragma once
 
#include <memory>
 
#include <userver/rcu/fwd.hpp>
#include <userver/tracing/span.hpp>
#include <userver/tracing/tracer_fwd.hpp>
 
#include <dynamic_config/variables/USERVER_NO_LOG_SPANS.hpp>
 
USERVER_NAMESPACE_BEGIN
 
/// Opentracing support
namespace tracing {
 
using NoLogSpans = ::dynamic_config::userver_no_log_spans::VariableType;
 
void SetNoLogSpans(NoLogSpans&& spans);
bool IsNoLogSpan(const std::string& name);
NoLogSpans CopyNoLogSpans();
 
// For legacy opentracing support only.
class Tracer final {
public:
    static void SetTracer(Tracer&& tracer);
 
    static rcu::ReadablePtr<Tracer, rcu::ExclusiveRcuTraits> ReadTracer();
 
    static Tracer CopyCurrentTracer();
 
    Tracer(std::string_view service_name, logging::LoggerPtr optional_logger)
        : service_name_(service_name),
          optional_logger_(std::move(optional_logger))
    {}
 
    // Only works if legacy opentracing is set up.
    const std::string& GetServiceName() const;
 
    const logging::LoggerPtr& GetOptionalLogger() const { return optional_logger_; }
 
private:
    std::string service_name_;
    logging::LoggerPtr optional_logger_;
};
 
// For tests and benchmarks only!
class TracerCleanupScope final {
public:
    TracerCleanupScope();
 
    TracerCleanupScope(TracerCleanupScope&&) = delete;
    TracerCleanupScope& operator=(TracerCleanupScope&&) = delete;
    ~TracerCleanupScope();
 
private:
    Tracer old_tracer_;
    NoLogSpans old_no_log_spans_;
};
 
}  // namespace tracing
 
USERVER_NAMESPACE_END