updated dockerfile and service.go to work with railway.app

Dockerfile

@@ -15,8 +15,10 @@ ADD . /go/src/github.com/AgoraIO-Community/agora-token-service
 
 ARG APP_ID
 ARG APP_CERTIFICATE
+ARG SERVER_PORT
 ENV APP_ID $APP_ID
 ENV APP_CERTIFICATE $APP_CERTIFICATE
+ENV SERVER_PORT $SERVER_PORT
 
 # move to the working directory
 WORKDIR $GOPATH/src/github.com/AgoraIO-Community/agora-token-service

service/http_handlers.go

@@ -9,7 +9,7 @@ import (
 )
 
 func (s *Service) getRtcToken(c *gin.Context) {
-	log.Printf("rtc token\n")
+	log.Println("Generating RTC token")
 	// get param values
 	channelName, tokentype, uidStr, role, expireTimestamp, err := s.parseRtcParams(c)
 
@@ -41,7 +41,7 @@ func (s *Service) getRtcToken(c *gin.Context) {
 }
 
 func (s *Service) getRtmToken(c *gin.Context) {
-	log.Println("Generating RTM Token")
+	log.Println("Generating RTM token")
 	// get param values
 	uidStr, expireTimestamp, err := s.parseRtmParams(c)
 
@@ -73,7 +73,7 @@ func (s *Service) getRtmToken(c *gin.Context) {
 }
 
 func (s *Service) getBothTokens(c *gin.Context) {
-	log.Printf("dual token\n")
+	log.Println("Generating RTC and RTM tokens")
 	// get rtc param values
 	channelName, tokentype, uidStr, role, expireTimestamp, rtcParamErr := s.parseRtcParams(c)
 

service/service.go

@@ -50,16 +50,22 @@ func NewService() *Service {
 
 	err := godotenv.Load()
 	if err != nil {
-		log.Fatal("Error loading .env file")
+		log.Println("Error loading .env file")
 	}
 	appIDEnv, appIDExists := os.LookupEnv("APP_ID")
 	appCertEnv, appCertExists := os.LookupEnv("APP_CERTIFICATE")
 	serverPort, serverPortExists := os.LookupEnv("SERVER_PORT")
 	if !appIDExists || !appCertExists || len(appIDEnv) == 0 || len(appCertEnv) == 0 {
-		log.Fatal("FATAL ERROR: ENV not properly configured, check APP_ID and APP_CERTIFICATE")
+		log.Fatal("FATAL ERROR: ENV not properly configured, check .env file or APP_ID and APP_CERTIFICATE")
 	}
-	if !serverPortExists {
-		serverPort = "8080"
+	if !serverPortExists || len(serverPort) == 0 {
+		// Check $PORT, this is used by Railway.
+		port, portExists := os.LookupEnv("PORT")
+		if portExists && len(port) > 0 {
+			serverPort = port
+		} else {
+			serverPort = "8080"
+		}
 	}
 
 	s := &Service{

service/tokens.go

@@ -32,4 +32,4 @@ func (s *Service) generateRtcToken(channelName, uidStr, tokentype string, role r
 		log.Println(err)
 		return "", err
 	}
-}
+}