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| package main | |
| import ( | |
| "fmt" | |
| "html/template" | |
| "log" | |
| "net/http" | |
| "os" | |
| ) | |
| func renderTemplate(w http.ResponseWriter, name string, data interface{}) { | |
| // This is inefficient - it reads the templates from the filesystem every | |
| // time. This makes it much easier to develop though, so we can edit our | |
| // templates and the changes will be reflected without having to restart | |
| // the app. | |
| t, err := template.ParseGlob("templates/*.html") | |
| if err != nil { | |
| http.Error(w, fmt.Sprintf("Error %s", err.Error()), 500) | |
| return | |
| } | |
| err = t.ExecuteTemplate(w, name, data) | |
| if err != nil { | |
| http.Error(w, fmt.Sprintf("Error %s", err.Error()), 500) | |
| return | |
| } | |
| } | |
| func index(w http.ResponseWriter, r *http.Request) { | |
| renderTemplate(w, "index.html", struct { | |
| Name string | |
| }{ | |
| Name: "Sonic the Hedgehog", | |
| }) | |
| } | |
| func logreq(f func(w http.ResponseWriter, r *http.Request)) http.Handler { | |
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| log.Printf("path: %s", r.URL.Path) | |
| f(w, r) | |
| }) | |
| } | |
| type App struct { | |
| Port string | |
| } | |
| func (a *App) Start() { | |
| http.Handle("/", logreq(index)) | |
| addr := fmt.Sprintf(":%s", a.Port) | |
| log.Printf("Starting app on %s", addr) | |
| log.Fatal(http.ListenAndServe(addr, nil)) | |
| } | |
| func env(key, adefault string) string { | |
| val, ok := os.LookupEnv(key) | |
| if !ok { | |
| return adefault | |
| } | |
| return val | |
| } | |
| func main() { | |
| server := App{ | |
| Port: env("PORT", "8080"), | |
| } | |
| server.Start() | |
| } |
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| <!DOCTYPE html> | |
| <html><head><title>Home Page</title> | |
| </head> | |
| <body> | |
| Hello <strong>{{.Name}}</strong> | |
| </body> |
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