golang .env e middleware

go-env/.env

@@ -0,0 +1,2 @@
+APP_PORT=:9000
+SECRET_MESSAGE=mindawakebodyasleep

go-env/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+  "fmt"
+  "log"
+  "os"
+  "net/http"
+  "github.com/joho/godotenv"
+)
+
+func main() {
+  err := godotenv.Load()
+  if err != nil {
+    log.Fatal(err)
+  }
+  port := os.Getenv("APP_PORT")
+  message := os.Getenv("SECRET_MESSAGE")
+  if port == "" {
+    port = ":3000"
+  }
+  fmt.Println("Running on port", port)
+  http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte(message))
+  })
+  log.Fatal(http.ListenAndServe(port, nil))
+}
+

go-middleware/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+  "fmt"
+  "log"
+  "time"
+  "net/http"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+  _, err := w.Write([]byte("Hello World!"))
+  if err != nil {
+    log.Fatal(err)
+  }
+}
+
+func exampleMiddleware(handler http.HandlerFunc) http.HandlerFunc {
+  return http.HandlerFunc(func (w http.ResponseWriter, r *http.Request) {
+    log.Println(r.Method, r.Proto, r.Host, r.URL, time.Since(time.Now()))
+    handler.ServeHTTP(w, r)
+  })
+}
+
+func main() {
+  fmt.Println("Running...")
+  http.HandleFunc("/", exampleMiddleware(handler))
+  http.Handle("/favicon.ico", http.NotFoundHandler())
+  log.Fatal(http.ListenAndServe(":3000", nil))
+}