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package main
import (
"fmt"
"log"
"net/http"
"os"
"time"
)
// ReadyValue indiciates the program is ready to receive traffic
var ReadyValue = http.StatusOK
// LiveValue indiciates the program is alive and should not be terminated
var LiveValue = http.StatusOK
var hostname string
func makeNotReady(w http.ResponseWriter, r *http.Request) {
ReadyValue = http.StatusBadRequest
w.Header().Set("responding-pod", hostname)
fmt.Fprintf(w, "%s", "Set Readiness Value to a failure state")
}
func makePodReady(w http.ResponseWriter, r *http.Request) {
ReadyValue = http.StatusOK
w.Header().Set("responding-pod", hostname)
fmt.Fprintf(w, "%s", "Set Readiness Value to successful (OK) state")
}
func killMe(w http.ResponseWriter, r *http.Request) {
LiveValue = http.StatusBadRequest
w.Header().Set("responding-pod", hostname)
fmt.Fprintf(w, "%s", "Set Liveness Value to a failure state")
}
func readinessCheck(w http.ResponseWriter, r *http.Request) {
w.Header().Set("responding-pod", hostname)
http.Error(w, "Responding with ReadyValue", ReadyValue)
}
func livenessCheck(w http.ResponseWriter, r *http.Request) {
w.Header().Set("responding-pod", hostname)
http.Error(w, "Responding with LiveValue", LiveValue)
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("responding-pod", hostname)
fmt.Fprintf(w, "%s", "I'm serving traffic!")
}
func main() {
// Force log output to stdout for Docker
log.SetOutput(os.Stdout)
// Configurable delay for startup
var delay = (1 * time.Second)
if os.Getenv("APPDELAY") != "" {
var err error
delay, err = time.ParseDuration(os.Getenv("APPDELAY"))
if err != nil {
log.Fatalf("Failed to parse time duration: %v", err)
}
}
time.Sleep(delay)
// Finish startup
hostname, _ = os.Hostname()
log.Println("Service started on port 80")
mux := http.NewServeMux()
mux.HandleFunc("/", rootHandler)
mux.HandleFunc("/ping", livenessCheck)
mux.HandleFunc("/ready", readinessCheck)
mux.HandleFunc("/makeNotReady", makeNotReady)
mux.HandleFunc("/makePodReady", makePodReady)
mux.HandleFunc("/killMe", killMe)
server := &http.Server{
Addr: ":80",
Handler: mux,
ReadTimeout: 3 * time.Second,
WriteTimeout: 3 * time.Second,
}
if err := server.ListenAndServe(); err != nil {
log.Fatalln(err)
}
}
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