1 files changed, 103 insertions, 0 deletions
diff --git a/src/noop.cpp b/src/noop.cpp
new file mode 100644
index 0000000..9c41ddb
--- /dev/null
+++ b/src/noop.cpp
@@ -0,0 +1,103 @@
+#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