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mini server/main.go

+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"html/template"
+	"log"
+	"net"
+	"net/http"
+	"os"
+)
+
+type ViewData struct {
+	Hostname        string
+	IpAddresses     []string
+	BackgroundColor string
+	AmountCalled    int
+}
+
+var amountCalled = 0
+
+func webHandlerFactory(tmpl *template.Template) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/" {
+			w.WriteHeader(404)
+			return // 404
+		}
+		amountCalled++
+		log.Println("request received")
+		hostname, err := os.Hostname()
+		addrs, err := net.InterfaceAddrs()
+		ipAddresses := make([]string, len(addrs))
+		for i, addr := range addrs {
+			ipAddresses[i] = addr.String()
+		}
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), 500)
+			return
+		}
+		hexStr := hex.EncodeToString([]byte(hostname))
+		// make sure, that the hexStr is not longer than 6 digits
+		if len(hexStr) > 6 {
+			hexStr = hexStr[:6]
+		}
+
+		err = tmpl.Execute(w, ViewData{
+			Hostname:        hostname,
+			BackgroundColor: fmt.Sprintf("#%s", hexStr),
+			AmountCalled:    amountCalled,
+			IpAddresses:     ipAddresses,
+		})
+
+		if err != nil {
+			http.Error(w, err.Error(), 500)
+			log.Println(err.Error())
+		}
+	}
+}
+
+func main() {
+	// parse the template
+	tmpl, err := template.ParseFiles("index.gohtml")
+	if err != nil {
+		panic(err)
+	}
+	http.HandleFunc("/", webHandlerFactory(tmpl))
+	log.Println("started web server")
+	http.ListenAndServe(":80", nil)
+}