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Enhance existing http example to support w3c trace context propagation (
#727)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| #pragma once | ||
| #include <atomic> | ||
| #include <string> | ||
| #include "opentelemetry/ext/http/server/http_server.h" | ||
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| namespace | ||
| { | ||
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| class HttpServer : public HTTP_SERVER_NS::HttpRequestCallback | ||
| { | ||
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| protected: | ||
| HTTP_SERVER_NS::HttpServer server_; | ||
| std::string server_url_; | ||
| uint16_t port_; | ||
| std::atomic<bool> is_running_{false}; | ||
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| public: | ||
| HttpServer(std::string server_name = "test_server", uint16_t port = 8800) : port_(port) | ||
| { | ||
| server_.setServerName(server_name); | ||
| server_.setKeepalive(false); | ||
| } | ||
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| void AddHandler(std::string path, HTTP_SERVER_NS::HttpRequestCallback *request_handler) | ||
| { | ||
| server_.addHandler(path, *request_handler); | ||
| } | ||
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| void Start() | ||
| { | ||
| if (!is_running_.exchange(true)) | ||
| { | ||
| server_.addListeningPort(port_); | ||
| server_.start(); | ||
| } | ||
| } | ||
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| void Stop() | ||
| { | ||
| if (is_running_.exchange(false)) | ||
| { | ||
| server_.stop(); | ||
| } | ||
| } | ||
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| ~HttpServer() { Stop(); } | ||
| }; | ||
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| } // namespace |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| #pragma once | ||
| #include "opentelemetry/exporters/ostream/span_exporter.h" | ||
| #include "opentelemetry/sdk/trace/simple_processor.h" | ||
| #include "opentelemetry/sdk/trace/tracer_provider.h" | ||
| #include "opentelemetry/trace/provider.h" | ||
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| #include "opentelemetry/context/propagation/global_propagator.h" | ||
| #include "opentelemetry/context/propagation/text_map_propagator.h" | ||
| #include "opentelemetry/trace/propagation/http_trace_context.h" | ||
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| #include <cstring> | ||
| #include <iostream> | ||
| #include <vector> | ||
| #include "opentelemetry/ext/http/client/http_client.h" | ||
| #include "opentelemetry/nostd/shared_ptr.h" | ||
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| namespace | ||
| { | ||
| // TBD - This function be removed once #723 is merged | ||
| inline nostd::shared_ptr<opentelemetry::trace::Span> GetSpanFromContext( | ||
| const opentelemetry::context::Context &context) | ||
| { | ||
| opentelemetry::context::ContextValue span = context.GetValue(opentelemetry::trace::kSpanKey); | ||
| if (nostd::holds_alternative<nostd::shared_ptr<opentelemetry::trace::Span>>(span)) | ||
| { | ||
| return nostd::get<nostd::shared_ptr<opentelemetry::trace::Span>>(span); | ||
| } | ||
| static nostd::shared_ptr<opentelemetry::trace::Span> invalid_span{ | ||
| new opentelemetry::trace::DefaultSpan(opentelemetry::trace::SpanContext::GetInvalid())}; | ||
| return invalid_span; | ||
| } | ||
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| template <typename T> | ||
| class HttpTextMapCarrier : public opentelemetry::context::propagation::TextMapCarrier | ||
| { | ||
| public: | ||
| HttpTextMapCarrier<T>(T &headers) : headers_(headers) {} | ||
| HttpTextMapCarrier() = default; | ||
| virtual nostd::string_view Get(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 ""; | ||
| } | ||
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| virtual void Set(nostd::string_view key, nostd::string_view value) noexcept override | ||
| { | ||
| headers_.insert(std::pair<std::string, std::string>(std::string(key), std::string(value))); | ||
| } | ||
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| T headers_; | ||
| }; | ||
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| void initTracer() | ||
| { | ||
| auto exporter = std::unique_ptr<sdktrace::SpanExporter>( | ||
| new opentelemetry::exporter::trace::OStreamSpanExporter); | ||
| auto processor = std::unique_ptr<sdktrace::SpanProcessor>( | ||
| new sdktrace::SimpleSpanProcessor(std::move(exporter))); | ||
| std::vector<std::unique_ptr<sdktrace::SpanProcessor>> processors; | ||
| processors.push_back(std::move(processor)); | ||
| // Default is an always-on sampler. | ||
| auto context = std::make_shared<sdktrace::TracerContext>(std::move(processors)); | ||
| auto provider = nostd::shared_ptr<opentelemetry::trace::TracerProvider>( | ||
| new sdktrace::TracerProvider(context)); | ||
| // Set the global trace provider | ||
| opentelemetry::trace::Provider::SetTracerProvider(provider); | ||
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| // set global propagator | ||
| opentelemetry::context::propagation::GlobalTextMapPropagator::SetGlobalPropagator( | ||
| nostd::shared_ptr<opentelemetry::context::propagation::TextMapPropagator>( | ||
| new opentelemetry::trace::propagation::HttpTraceContext())); | ||
| } | ||
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| nostd::shared_ptr<opentelemetry::trace::Tracer> get_tracer(std::string tracer_name) | ||
| { | ||
| auto provider = opentelemetry::trace::Provider::GetTracerProvider(); | ||
| return provider->GetTracer(tracer_name); | ||
| } | ||
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| } // namespace |
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