package main import ( "io" "net/http" "golang.org/x/net/context/ctxhttp" "fmt" "io/ioutil" "time" "errors" "strconv" _ "github.com/aws/aws-xray-sdk-go/plugins/ec2" _ "github.com/aws/aws-xray-sdk-go/plugins/ecs" "github.com/aws/aws-xray-sdk-go/xray" ) func init() { xray.Configure(xray.Config{ DaemonAddr: "xray-service.default:2000", LogLevel: "info", }) } var tr = &http.Transport{ MaxIdleConns: 20, IdleConnTimeout: 30 * time.Second, } func main() { http.Handle("/api", xray.Handler(xray.NewFixedSegmentNamer("x-ray-sample-front-k8s"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { slow := param(r, "slow", "false") repeat := param(r, "repeat", "false") count := 1 if repeat == "true" { count = 20 } for idx := 0; idx < count; idx++ { if resp, err := backend(r, slow); err == nil { io.WriteString(w, fmt.Sprintf("%s
", resp)) } else { io.WriteString(w, fmt.Sprintf("Unable to make request to: http://x-ray-sample-back-k8s.default.svc.cluster.local: %v
", err)) } } }))) // Write the landing page http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/html") io.WriteString(w, html) }) http.ListenAndServe(":8080", nil) } func backend(r *http.Request, slow string) (string, error) { resp, err := ctxhttp.Get( r.Context(), xray.Client(&http.Client{Transport: tr}), fmt.Sprintf("http://x-ray-sample-back-k8s.default.svc.cluster.local?slow=%s", slow), ) if err != nil { return "", err } defer resp.Body.Close() if resp.StatusCode == http.StatusOK { body, err := ioutil.ReadAll(resp.Body) if err != nil { return "", err } return string(body), nil } else { return "", errors.New(fmt.Sprintf("Bad backend request - http status: %s", strconv.Itoa(resp.StatusCode))) } } func param(r *http.Request, name, base string) string { if vars, ok := r.URL.Query()[name]; ok && len(vars) > 0 && len(vars[0]) > 0 { return vars[0] } return base } var html = ` 

                          oooo$$$$$$$$$$$$oooo
                      oo$$$$$$$$$$$$$$$$$$$$$$$$o
                   oo$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$o         o$   $$ o$
   o $ oo        o$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$o       $$ $$ $$o$
oo $ $ "$      o$$$$$$$$$    $$$$$$$$$$$$$    $$$$$$$$$o       $$$o$$o$
"$$$$$$o$     o$$$$$$$$$      $$$$$$$$$$$      $$$$$$$$$$o    $$$$$$$$
  $$$$$$$    $$$$$$$$$$$      $$$$$$$$$$$      $$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$    $$$$$$$$$$$$$    $$$$$$$$$$$$$$  """$$$
   "$$$""""$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$     "$$$
    $$$   o$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$     "$$$o
   o$$"   $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$       $$$o
   $$$    $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$""$$$$$$ooooo$$$$o
  o$$$oooo$$$$$  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$  o$$$$$$$$$$$$$$$$$
  $$$$$$$$"$$$$   $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$     $$$$""""""""
 """"       $$$$    "$$$$$$$$$$$$$$$$$$$$$$$$$$$$"      o$$$
            "$$$o     """$$$$$$$$$$$$$$$$$$"$$"         $$$
              $$$o          "$$""$$$$$$""""           o$$$
               $$$$o                                o$$$"
                "$$$$o      o$$$$$$o"$$$$o        o$$$$
                  "$$$$$oo     ""$$$$o$$$$$o   o$$$$""
                     ""$$$$$oooo  "$$$o$$$$$$$$$"""
                        ""$$$$$$$oo $$$$$$$$$$
                                """"$$$$$$$$$$$
                                    $$$$$$$$$$$$
                                     $$$$$$$$$$"
                                      "$$$""""


`