Use env lib, add PROXY_PORT ENV variable

server.go

@@ -1,34 +1,47 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"os"
 
 	"github.com/armon/go-socks5"
+	"github.com/caarlos0/env"
 )
 
-func main() {
+type params struct {
+	User     string `env:"PROXY_USER" envDefault:""`
+	Password string `env:"PROXY_PASSWORD" envDefault:""`
+	Port     string `env:"PROXY_PORT" envDefault:"1080"`
+}
 
-	conf := &socks5.Config{
+func main() {
+	// Working with app params
+	cfg := params{}
+	err := env.Parse(&cfg)
+	if err != nil {
+		log.Printf("%+v\n", err)
+	}
+
+	//Initialize socks5 config
+	socsk5conf := &socks5.Config{
 		Logger: log.New(os.Stdout, "", log.LstdFlags),
 	}
 
-	if os.Getenv("PROXY_USER")+os.Getenv("PROXY_PASSWORD") != "" {
+	if cfg.User+cfg.Password != "" {
 		creds := socks5.StaticCredentials{
 			os.Getenv("PROXY_USER"): os.Getenv("PROXY_PASSWORD"),
 		}
 		cator := socks5.UserPassAuthenticator{Credentials: creds}
-		conf.AuthMethods = []socks5.Authenticator{cator}
+		socsk5conf.AuthMethods = []socks5.Authenticator{cator}
 	}
 
-	server, err := socks5.New(conf)
+	server, err := socks5.New(socsk5conf)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	fmt.Println("Start listening ...")
-	if err := server.ListenAndServe("tcp", ":1080"); err != nil {
+	log.Printf("Start listening proxy service on port %s\n", cfg.Port)
+	if err := server.ListenAndServe("tcp", ":"+cfg.Port); err != nil {
 		log.Fatal(err)
 	}
 }