refactor(db): unify env getters

Signed-off-by: Klagarge <remi@heredero.ch>

db/src/main.go

@@ -27,20 +27,10 @@ type ProvenceData struct {
 }
 
 func mqttConnection() *mqtt.MqttGateway {
-	BrokerUrl, ok := os.LookupEnv("MQTT_BROKER_URL")
-	if !ok {
-		BrokerUrl = "tls://localhost:8883"
-	}
+	BrokerUrl := getEnv("MQTT_BROKER_URL", "tls://localhost:8883")
+	Username := getEnv("MQTT_USERNAME", "user")
+	Password := getEnv("MQTT_PASSWORD", "password")
 
-	Username, ok := os.LookupEnv("MQTT_USERNAME")
-	if !ok {
-		Username = "user"
-	}
-
-	Password, ok := os.LookupEnv("MQTT_PASSWORD")
-	if !ok {
-		Password = "password"
-	}
 	ClientId := "mqtt-gateway-test-client_" + fmt.Sprint(time.Now().Unix())
 
 	// Create config & gateway
@@ -64,18 +54,12 @@ func mqttConnection() *mqtt.MqttGateway {
 }
 
 func influxConnection() *influx.InfluxGateway {
-	influxUrl, ok := os.LookupEnv("INFLUX_URL")
-	if !ok {
-		influxUrl = "https://db.e.kb28.ch:443"
-	}
-	influxDatabase, ok := os.LookupEnv("INFLUX_DATABASE")
-	if !ok {
-		influxDatabase = "provence"
-	}
+	influxUrl := getEnv("INFLUX_URL", "https://db.e.kb28.ch:443")
 
-	influxToken := os.Getenv("INFLUX_TOKEN")
+	influxDatabase := getEnv("INFLUX_DATABASE", "provence")
+	influxToken := getEnv("INFLUX_TOKEN", "")
 	if influxToken == "" {
-		if tokenFile := os.Getenv("INFLUX_TOKEN_FILE"); tokenFile != "" {
+		if tokenFile := getEnv("INFLUX_TOKEN_FILE", "/run/secrets/admin-token"); tokenFile != "" {
 			content, err := os.ReadFile(tokenFile)
 			if err == nil {
 				influxToken = strings.TrimSpace(string(content))
@@ -108,10 +92,7 @@ func influxConnection() *influx.InfluxGateway {
 // @securityDefinitions.basic BasicAuth
 func main() {
 	// Load mapping configuration
-	mappingPath := os.Getenv("MAPPING_CONFIG_PATH")
-	if mappingPath == "" {
-		mappingPath = "mapping.json"
-	}
+	mappingPath := getEnv("MAPPING_CONFIG_PATH", "mapping.json")
 	mapping, err := LoadMapping(mappingPath)
 	if err != nil {
 		log.Printf("[Main] Warning: could not load mapping file: %v. Using defaults.", err)
@@ -124,10 +105,7 @@ func main() {
 	influxGateway := influxConnection()
 	defer influxGateway.Close()
 
-	measurementName := os.Getenv("CAMPUS")
-	if measurementName == "" {
-		measurementName = "provence"
-	}
+	measurementName := getEnv("CAMPUS", "provence")
 
 	// Create measurement for provence topic
 	provenceMeasurement := point.CreateMeasurement[ProvenceData](measurementName)
@@ -177,10 +155,7 @@ func main() {
 	restPassword := getEnv("REST_PASSWORD", "password")
 	restGateway := rest.NewRestGateway(influxGateway, measurementName, restUsername, restPassword)
 
-	port, ok := os.LookupEnv("REST_PORT")
-	if !ok {
-		port = "8080"
-	}
+	port := getEnv("REST_PORT", "8080")
 
 	log.Printf("[Main] Starting REST Gateway on port %s\n", port)
 	if err := restGateway.Run(":" + port); err != nil {