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