118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#include "opentelemetry/context/context.h"
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#include "opentelemetry/context/propagation/global_propagator.h"
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#include "opentelemetry/context/propagation/text_map_propagator.h"
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#include "opentelemetry/context/runtime_context.h"
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#include "opentelemetry/nostd/shared_ptr.h"
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#include "opentelemetry/nostd/string_view.h"
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#include "opentelemetry/nostd/variant.h"
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#include "opentelemetry/semconv/client_attributes.h"
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#include "opentelemetry/semconv/incubating/http_attributes.h"
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#include "opentelemetry/semconv/server_attributes.h"
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#include "opentelemetry/semconv/url_attributes.h"
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#include "opentelemetry/trace/context.h"
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#include "opentelemetry/trace/scope.h"
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#include "opentelemetry/trace/span.h"
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#include "opentelemetry/trace/span_context.h"
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#include "opentelemetry/trace/span_metadata.h"
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#include "opentelemetry/trace/span_startoptions.h"
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#include "opentelemetry/trace/tracer.h"
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#include "tracer_common.h"
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#include <stdlib.h>
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#include <chrono>
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#include <iostream>
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#include <map>
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#include <thread>
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#include <utility>
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#include "server.h"
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namespace
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{
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using namespace opentelemetry::trace;
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namespace context = opentelemetry::context;
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namespace semconv = opentelemetry::semconv;
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uint16_t server_port = 8800;
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constexpr const char *server_name = "localhost";
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class RequestHandler : public HTTP_SERVER_NS::HttpRequestCallback
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{
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public:
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int onHttpRequest(HTTP_SERVER_NS::HttpRequest const &request,
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HTTP_SERVER_NS::HttpResponse &response) override
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{
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StartSpanOptions options;
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options.kind = SpanKind::kServer; // server
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std::string span_name = request.uri;
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// extract context from http header
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std::map<std::string, std::string> &request_headers =
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const_cast<std::map<std::string, std::string> &>(request.headers);
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const HttpTextMapCarrier<std::map<std::string, std::string>> carrier(request_headers);
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auto prop = context::propagation::GlobalTextMapPropagator::GetGlobalPropagator();
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auto current_ctx = context::RuntimeContext::GetCurrent();
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auto new_context = prop->Extract(carrier, current_ctx);
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options.parent = GetSpan(new_context)->GetContext();
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// start span with parent context extracted from http header
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auto span = get_tracer("http-server")
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->StartSpan(span_name,
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{{semconv::server::kServerAddress, server_name},
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{semconv::server::kServerPort, server_port},
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{semconv::http::kHttpRequestMethod, request.method},
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{semconv::url::kUrlScheme, "http"},
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{semconv::http::kHttpRequestBodySize,
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static_cast<uint64_t>(request.content.length())},
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{semconv::client::kClientAddress, request.client}},
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options);
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auto scope = get_tracer("http_server")->WithActiveSpan(span);
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for (auto &kv : request.headers)
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{
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span->SetAttribute("http.header." + std::string(kv.first.data()), kv.second);
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}
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if (request.uri == "/helloworld")
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{
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span->AddEvent("Processing request");
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response.headers[HTTP_SERVER_NS::CONTENT_TYPE] = HTTP_SERVER_NS::CONTENT_TYPE_TEXT;
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span->End();
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return 200;
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}
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span->End();
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return 404;
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}
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};
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} // namespace
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int main(int argc, char *argv[])
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{
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InitTracer();
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// The port the validation service listens to can be specified via the command line.
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if (argc > 1)
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{
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server_port = static_cast<uint16_t>(atoi(argv[1]));
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}
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HttpServer http_server(server_name, server_port);
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RequestHandler req_handler;
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http_server.AddHandler("/helloworld", &req_handler);
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auto root_span = get_tracer("http_server")->StartSpan(__func__);
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Scope scope(root_span);
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http_server.Start();
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std::cout << "Server is running..Press ctrl-c to exit...\n";
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while (1)
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{
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std::this_thread::sleep_for(std::chrono::seconds(100));
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}
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http_server.Stop();
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root_span->End();
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CleanupTracer();
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return 0;
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}
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