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server.go
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server.go
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package main
import (
"flag"
"fmt"
"net/http"
"time"
opentracing "github.com/opentracing/opentracing-go"
// See https://docs.datadoghq.com/tracing/setup/go/
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/opentracer"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
const (
serviceName = "hello-server"
)
var collectorHost = flag.String("collector_host", "dd-agent", "Host for Datadog agent")
var collectorPort = flag.String("collector_port", "8126", "Port for Datadog agent")
func handler(w http.ResponseWriter, r *http.Request) {
wireContext, _ := opentracing.GlobalTracer().Extract(
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(r.Header))
span := opentracing.StartSpan("GET /", opentracing.ChildOf(wireContext))
defer span.Finish()
tm := time.Now().Format(time.RFC1123)
w.Write([]byte("The time is " + tm))
}
func main() {
flag.Parse()
agentAddr := fmt.Sprintf("%v:%v", *collectorHost, *collectorPort)
t := opentracer.New(tracer.WithServiceName(serviceName), tracer.WithAgentAddr(agentAddr))
defer tracer.Stop()
opentracing.SetGlobalTracer(t)
http.HandleFunc("/", handler)
http.ListenAndServe(":9001", nil)
}