add config

.env

@@ -0,0 +1,2 @@
+WALLET_API_REST_HOST=127.0.0.1
+WALLET_API_REST_PORT=3000

cmd/apid/main.go

@@ -14,16 +14,12 @@ import (
 	"sync"
 	"time"
 
+	"github.com/timurguseynov/go-wallet-api/config"
 	"github.com/timurguseynov/go-wallet-api/internal/db"
 
 	"github.com/timurguseynov/go-wallet-api/cmd/apid/handlers"
 )
 
-const (
-	host = "localhost"
-	port = "3000"
-)
-
 // init is called before main. We are using init to customize logging output.
 func init() {
 	log.SetFlags(log.LstdFlags | log.Lmicroseconds | log.Lshortfile)
@@ -34,6 +30,12 @@ func init() {
 func main() {
 	log.Println("main : Started")
 
+	// Read the config from .env file or environment variables
+	conf, err := config.Read()
+	if err != nil {
+		log.Fatal("main : couldn't read config", err)
+	}
+
 	// Register the Master Session for the database.
 	log.Println("main : Started : Capturing Master DB:")
 	dbConn, err := db.NewDB()
@@ -44,7 +46,7 @@ func main() {
 	}
 
 	server := http.Server{
-		Addr:    host + ":" + port,
+		Addr:    conf.REST.Host + ":" + conf.REST.Port,
 		Handler: handlers.API(dbConn),
 	}
 
@@ -54,7 +56,7 @@ func main() {
 
 	// Start the listener.
 	go func() {
-		log.Printf("startup : Listening %s", host)
+		log.Printf("startup : Listening %s:%s", conf.REST.Host, conf.REST.Port)
 		log.Printf("shutdown : Listener closed : %v", server.ListenAndServe())
 		wg.Done()
 	}()

config/config.go

@@ -0,0 +1,29 @@
+package config
+
+import (
+	"github.com/joho/godotenv"
+
+	"github.com/kelseyhightower/envconfig"
+)
+
+type Config struct {
+	REST struct {
+		Host string `default:"127.0.0.1" envconfig:"HOST"`
+		Port string `default:"3000" envconfig:"PORT"`
+	}
+}
+
+func Read() (Config, error) {
+	var config Config
+
+	err := godotenv.Load()
+	if err != nil {
+		return config, err
+	}
+
+	if err := envconfig.Process("WALLET_API", &config); err != nil {
+		return config, err
+	}
+
+	return config, nil
+}

go.mod

@@ -7,6 +7,8 @@ require (
 	github.com/google/uuid v1.5.0
 	github.com/gorilla/websocket v1.5.1
 	github.com/hashicorp/go-memdb v1.3.4
+	github.com/joho/godotenv v1.5.1
+	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/pborman/uuid v1.2.1
 	github.com/pkg/errors v0.8.0
 	github.com/stretchr/testify v1.2.2

go.sum

@@ -20,6 +20,10 @@ github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/b
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
 github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/kelseyhightower/envconfig v1.4.0 h1:Im6hONhd3pLkfDFsbRgu68RDNkGF1r3dvMUtDTo2cv8=
+github.com/kelseyhightower/envconfig v1.4.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
 github.com/pborman/uuid v1.2.1 h1:+ZZIw58t/ozdjRaXh/3awHfmWRbzYxJoAdNJxe/3pvw=
 github.com/pborman/uuid v1.2.1/go.mod h1:X/NO0urCmaxf9VXbdlT7C2Yzkj2IKimNn4k+gtPdI/k=
 github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=