use log package

database/database.go

@@ -1,8 +1,9 @@
 package database
 
 import (
-	"flag"
 	"fmt"
+	"log"
+
 	"github.com/jinzhu/gorm"
 	_ "github.com/jinzhu/gorm/dialects/postgres"
 	"log"
@@ -54,6 +55,8 @@ func InitDB(dbname string, isTest bool) *gorm.DB {
 		DropTables(db)
 	}
 
+	log.Println("Database connection established")
+
 	return db
 }
 

routes/healthz/healthz_endpoint.go

@@ -1,10 +1,10 @@
 package healthz
 
 import (
-	"fmt"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/amqp"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
 	"github.com/gin-gonic/gin"
+	"log"
 	"net/http"
 )
 
@@ -35,7 +35,7 @@ func getHealth(c *gin.Context) {
 	if len(database.AMQP_URL) != 0 {
 		err = amqp.CheckConnection()
 		if err != nil {
-			fmt.Println(err.Error())
+			log.Println(err.Error())
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"success:": false,
 				"message":  err.Error(),

start.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"fmt"
+	"log"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/amqp"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/healthz"
 	"time"
@@ -71,7 +71,7 @@ func main() {
 		fmt.Println("Starting AMQP client")
 		err := amqp.ConnectAMQP(database.AMQP_URL)
 		if err != nil {
-			panic(err)
+			log.Panic(err)
 		}
 
 		// Periodically call the Ping function to check which simulators are still there
@@ -83,12 +83,14 @@ func main() {
 				case <-ticker.C:
 					err = amqp.PingAMQP()
 					if err != nil {
-						fmt.Println("AMQP Error: ", err.Error())
+						log.Println("AMQP Error: ", err.Error())
 					}
 				}
 			}
 
 		}()
+
+		log.Printf("Connected AMQP client to %s", amqpurl)
 	}
 	// server at port 4000 to match frontend's redirect path
 	r.Run(":4000")