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#include <opentracing/noop.h>
namespace opentracing {
BEGIN_OPENTRACING_ABI_NAMESPACE
namespace {
class NoopSpanContext : public SpanContext {
public:
void ForeachBaggageItem(
std::function<bool(const std::string& key,
const std::string& value)> /*f*/) const override {}
std::unique_ptr<SpanContext> Clone() const noexcept override {
return std::unique_ptr<SpanContext>{new (std::nothrow) NoopSpanContext{}};
}
};
class NoopSpan : public Span {
public:
explicit NoopSpan(std::shared_ptr<const Tracer>&& tracer) noexcept
: tracer_(std::move(tracer)) {}
void FinishWithOptions(
const FinishSpanOptions& /*finish_span_options*/) noexcept override {}
void SetOperationName(string_view /*name*/) noexcept override {}
void SetTag(string_view /*key*/, const Value& /*value*/) noexcept override {}
void SetBaggageItem(string_view /*restricted_key*/,
string_view /*value*/) noexcept override {}
std::string BaggageItem(string_view /*restricted_key*/) const
noexcept override {
return {};
}
void Log(std::initializer_list<std::pair<string_view, Value>>
/*fields*/) noexcept override {}
void Log(SystemTime /*timestamp*/,
std::initializer_list<
std::pair<string_view, Value>> /*fields*/) noexcept override {}
void Log(SystemTime /*timestamp*/,
const std::vector<
std::pair<string_view, Value>>& /*fields*/) noexcept override {}
const SpanContext& context() const noexcept override { return span_context_; }
const Tracer& tracer() const noexcept override { return *tracer_; }
private:
std::shared_ptr<const Tracer> tracer_;
NoopSpanContext span_context_;
};
class NoopTracer : public Tracer,
public std::enable_shared_from_this<NoopTracer> {
public:
std::unique_ptr<Span> StartSpanWithOptions(
string_view /*operation_name*/, const StartSpanOptions& /*options*/) const
noexcept override {
return std::unique_ptr<Span>(new (std::nothrow)
NoopSpan(shared_from_this()));
}
expected<void> Inject(const SpanContext& /*sc*/,
std::ostream& /*writer*/) const override {
return {};
}
expected<void> Inject(const SpanContext& /*sc*/,
const TextMapWriter& /*writer*/) const override {
return {};
}
expected<void> Inject(const SpanContext& /*sc*/,
const HTTPHeadersWriter& /*writer*/) const override {
return {};
}
expected<std::unique_ptr<SpanContext>> Extract(
std::istream& /*reader*/) const override {
return std::unique_ptr<SpanContext>(nullptr);
}
expected<std::unique_ptr<SpanContext>> Extract(
const TextMapReader& /*reader*/) const override {
return std::unique_ptr<SpanContext>(nullptr);
}
expected<std::unique_ptr<SpanContext>> Extract(
const HTTPHeadersReader& /*reader*/) const override {
return std::unique_ptr<SpanContext>(nullptr);
}
};
} // anonymous namespace
std::shared_ptr<Tracer> MakeNoopTracer() noexcept {
return std::shared_ptr<Tracer>(new (std::nothrow) NoopTracer());
}
END_OPENTRACING_ABI_NAMESPACE
} // namespace opentracing
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