Adding proper logging file, cleaning main.go, gitignore update

.gitignore

@@ -1 +1,2 @@
 *.swp
+*.log

app/main.go

@@ -1,7 +1,7 @@
+// Receive http PURGE request and broadcast it to several Varnish servers.
 package main
 
 import (
-    "fmt"
 	"io"
 	"log"
 	"net/http"
@@ -44,8 +44,8 @@ func SendToVarnish(url string) string {
 	status = "200 Purged"
 	// Take url to ban as argument.
 	// Loop over the list of Varnish servers and send PURGE request to each.
+	// Update status variable to check if servers have successfully purge url.
 	for i := 0; i < len(varnishList); i++ {
-        //status = "200 Purged"
 		client := &http.Client{}
 		domain := strings.Trim(varnishList[i], "\r\n")
 		req, err := http.NewRequest(MethodPurge, domain+url, nil)
@@ -56,21 +56,25 @@ func SendToVarnish(url string) string {
 		if err != nil {
 			log.Fatal("Client.do: %s", err)
 		}
-        //fmt.Printf("Resp: %v\n", resp)
 		if resp.StatusCode != 200 {
 			status = "405 Not Allowed"
 		}
-        fmt.Println("Purge URL" + " " + domain + url + " : " + status)
+		log.Println("Purge " + domain + url + " : " + status)
 	}
 	return status
 }
 
 // HealthHandler handles healthcheck requests and return 200.
-func HealthHandler(w http.ResponseWriter, r *http.Request) {
+func HealthHandler(w http.ResponseWriter, _ *http.Request) {
 	io.WriteString(w, "OK")
 }
 
 func main() {
+	logFile, err := os.OpenFile("./log/purge.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(err)
+	}
+	log.SetOutput(logFile)
 	http.HandleFunc("/", PurgeHandler)
 	http.HandleFunc("/healthcheck", HealthHandler)
 	log.Fatal(http.ListenAndServe(":6081", nil))