Use new practices

Dockerfile

@@ -1,10 +1,10 @@
-# Build Stage: Build bot using the alpine image
+# Build Stage: Build bot using the golang image
 FROM golang:1.20-alpine AS builder
 WORKDIR /app
 COPY . .
 RUN CGO_ENABLED=0 GOOS=`go env GOHOSTOS` GOARCH=`go env GOHOSTARCH` go build -o out/aliveimage
 
-# Run Stage: Run bot using the bot and doppler binary copied from build stage
-FROM alpine:3.17
-COPY --from=builder /app/out/aliveimage /
-CMD ["/aliveimage"]
+# Final Stage: Use a smaller base image and only include necessary files
+FROM scratch
+COPY --from=builder /app/out/aliveimage /app/aliveimage
+CMD ["/app/aliveimage"]

main.go

@@ -11,39 +11,39 @@ import (
 	"github.com/uptrace/bunrouter"
 )
 
-// start is the time when the server started
 var start time.Time
 
-// PORT is the port the server is listening on
-var PORT int = func() int {
-	port := os.Getenv("PORT")
-	if port == "" {
-		return 80
+func main() {
+	// Use the log package's default logger
+	log.SetFlags(log.LstdFlags | log.Lmicroseconds)
+
+	// Get the port from the environment variable or default to 8080
+	port, err := strconv.Atoi(os.Getenv("PORT"))
+	if err != nil {
+		port = 8080
 	}
-	// convert string to int
-	returnPort, _ := strconv.Atoi(port)
-	return returnPort
-}()
 
-func main() {
-	// set the time when the server started
-	start = time.Now()
-	// create a new bunrouter
+	// Create a new bunrouter
 	router := bunrouter.New()
 
-	// add a route for the index
+	// Add a route for the index
 	router.GET("/", indexHandler)
 
-	// start the server
-	log.Printf("listening on http://localhost:%d\n", PORT)
+	// Start the server
+	log.Printf("Listening on :%d\n", port)
 
-	// listen and serve
-	log.Println(http.ListenAndServe(fmt.Sprintf(":%d", PORT), router))
+	// Use http.ListenAndServe() directly instead of logging the return value
+	if err := http.ListenAndServe(fmt.Sprintf(":%d", port), router); err != nil {
+		log.Fatalf("Failed to start server: %v", err)
+	}
 }
 
 // indexHandler is the handler for the index route
 func indexHandler(w http.ResponseWriter, req bunrouter.Request) error {
-	// return a JSON response with the status and uptime, truncated to seconds
+	// Set the content type to JSON
+	w.Header().Set("Content-Type", "application/json")
+
+	// Return a JSON response with the status and uptime, truncated to seconds
 	return bunrouter.JSON(w,
 		bunrouter.H{
 			"status":   "alive",