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@zentrope zentrope/pingweb.go
Last active Apr 18, 2016

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ping web
package main
import (
"encoding/json"
"io"
"log"
"net/http"
"os"
"os/signal"
)
// These have to be upper case if we want to marshal with json.
type Service struct {
Name string `json:"name"`
Status string `json:"status"`
}
type Status struct {
Summary string `json:"summary"`
Services []Service `json:"services"`
}
func findStatus() Status {
return Status{
Summary: "Partial",
Services: []Service{
Service{"Foo", "Ok"},
Service{"Bar", "Ok"},
Service{"Baz", "Down"}}}
}
func jsonWrite(d interface{}) string {
b, err := json.MarshalIndent(d, "", " ")
if err != nil {
panic(err)
}
return string(b)
}
func pingHandler(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Ok")
}
func statusHandler(w http.ResponseWriter, r *http.Request) {
b := jsonWrite(findStatus())
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.WriteHeader(200)
io.WriteString(w, b)
}
func start() {
log.Println("Starting web app.")
log.Fatal(http.ListenAndServe(":8080", nil))
}
func lock() {
log.Println("Setting up signal listener.")
var sigChan = make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
whatSig := <-sigChan
log.Printf("System signal: `%s`.\n", whatSig)
}
func main() {
log.Println("Hello Ping Web Application")
http.HandleFunc("/ping", pingHandler)
http.HandleFunc("/status", statusHandler)
go start()
log.Println("Locking...")
lock()
log.Println("System halt.")
}
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