WIP Counter Webserver

server.go

package main

import (
	"fmt"
	"image"
	_ "image/png"
	"net/http"
	"os"
	"regexp"
	"sync"
)

var matcher = regexp.MustCompile(`/counter/(\w+)`)

// Handler handles
type Handler struct {
	counters map[string]int
	mux      sync.Mutex
}

func loadImage() {
	existingImageFile, err := os.Open("images/numbers.png")
	if err != nil {
		panic(err)
	}
	defer existingImageFile.Close()

	// TODO use this _ thing, cut it up, and then splat it out to the screen
	_, imageType, err := image.Decode(existingImageFile)
	fmt.Println("imageType is ", imageType)
}

// ServeHTTP does stuff
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	res := matcher.FindAllStringSubmatch(r.URL.Path, -1)
	if res != nil {
		lookup := res[0][1]

		h.mux.Lock()
		defer h.mux.Unlock()

		if r.Method == "DELETE" {
			h.counters[lookup] = 0

		} else {
			h.counters[lookup]++
		}
		fmt.Fprintf(w, "Hello, %d", h.counters[lookup])
		return
	}
	// no pattern matched; send 404 response
	http.NotFound(w, r)
}

func main() {
	router := Handler{counters: make(map[string]int, 0)}
	loadImage()
	http.ListenAndServe(":8080", &router)
}