89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"time"
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)
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var version string
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var tracer = []string{
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"x-request-id",
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"x-b3-traceid",
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"x-b3-spanid",
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"x-b3-parentspanid",
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"x-b3-sampled",
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"x-b3-flags",
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"x-ot-span-context",
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}
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func trace(rd, rs *http.Request) {
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if rd == nil || rs == nil {
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return
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}
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for _, t := range tracer {
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v := rs.Header.Get(t)
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if v != "" {
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rd.Header.Set(t, v)
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}
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}
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}
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func get(c *http.Client, req *http.Request, url string) (body string, err error) {
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r, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return
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}
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trace(r, req)
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resp, err := c.Do(r)
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if err != nil {
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return
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}
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defer resp.Body.Close()
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return
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}
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body = string(b)
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return
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}
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func main() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s", r.RemoteAddr, r.Method, r.URL)
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h, err := os.Hostname()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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c := &http.Client{Transport: &http.Transport{
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DialContext: (&net.Dialer{
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Timeout: 5 * time.Second,
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}).DialContext,
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}}
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body, err := get(c, r, "http://testapp-api:8080/healthz")
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if err != nil {
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body = err.Error()
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}
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fmt.Fprintf(w, "%s (%s) API Health: '%s'", h, version, body)
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})
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http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s", r.RemoteAddr, r.Method, r.URL)
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fmt.Fprintf(w, "db: ok")
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})
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http.HandleFunc("/favicon.ico", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusNotFound)
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})
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s := &http.Server{
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 10 * time.Second,
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IdleTimeout: 120 * time.Second,
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Addr: ":8080",
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}
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log.Fatal(s.ListenAndServe())
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}
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