Write the current time to an image from a google cloud function in Go

main.go

package main

import (
	"flag"
	"net/http"
	"time"

	"github.com/fogleman/gg"
	"github.com/golang/freetype/truetype"
	"golang.org/x/image/font/gofont/goregular"

	"./nodego"
)

func init() {
	nodego.OverrideLogger()
}

func handler(w http.ResponseWriter, r *http.Request) {

	// create a blank white canvas
	height := 200
	width := 600
	canvas := gg.NewContext(width, height)
	canvas.SetRGB(1, 1, 1)

	// clear the white canvas and set the foreground to black
	canvas.Clear()
	canvas.SetRGB(0, 0, 0)

	// parse the go font from standard library
	font, err := truetype.Parse(goregular.TTF)
	if err != nil {
		// nodego.ErrorLogger.Println(err)
		return
	}

	// create a new font and set it's size
	fontFace := truetype.NewFace(font, &truetype.Options{
		Size: 36,
	})

	canvas.SetFontFace(fontFace)

	// get current time and format it in UTC timezone
	now := time.Now()
	timeString := now.UTC().Format("2006-01-02 15:04:05 MST")

	// write the current time to the canvas
	canvas.DrawStringAnchored(timeString, float64(width/2), float64(height/2), 0.5, 0.5)

	// encode the image as a png and write to response
	w.WriteHeader(200)
	err = canvas.EncodePNG(w)
	if err != nil {
		// nodego.ErrorLogger.Println(err)
		return
	}
}

func main() {
	flag.Parse()
	http.HandleFunc(nodego.HTTPTrigger, nodego.WithLoggerFunc(handler))
	nodego.TakeOver()
}