132 lines
3.2 KiB
Go
132 lines
3.2 KiB
Go
package config
|
|
|
|
import (
|
|
"context"
|
|
"flag"
|
|
"log"
|
|
"os"
|
|
"strconv"
|
|
|
|
"github.com/joho/godotenv"
|
|
)
|
|
|
|
const LOCAL_ENV = ".env.local"
|
|
|
|
type Nats struct {
|
|
Url string
|
|
Name string
|
|
VerifyCertificates bool
|
|
Ctx context.Context
|
|
}
|
|
|
|
type Mqtt struct {
|
|
Url string
|
|
UrlForTls string
|
|
SkipVerify bool
|
|
ClientId string
|
|
Username string
|
|
Password string
|
|
Qos int
|
|
Ctx context.Context
|
|
}
|
|
|
|
type Config struct {
|
|
Nats Nats
|
|
Mqtt Mqtt
|
|
}
|
|
|
|
func NewConfig() *Config {
|
|
|
|
loadEnvVariables()
|
|
log.SetFlags(log.LstdFlags | log.Lshortfile)
|
|
|
|
natsUrl := flag.String("nats_url", lookupEnvOrString("NATS_URL", "nats://localhost:4222"), "url for nats server")
|
|
natsName := flag.String("nats_name", lookupEnvOrString("NATS_NAME", "mqtt-adapter"), "name for nats client")
|
|
natsVerifyCertificates := flag.Bool("nats_verify_certificates", lookupEnvOrBool("NATS_VERIFY_CERTIFICATES", false), "verify validity of certificates from nats server")
|
|
mqttUrl := flag.String("mqtt_url", lookupEnvOrString("MQTT_URL", "tcp://localhost:1883"), "url for mqtt server")
|
|
mqttsUrl := flag.String("mqtts_url", lookupEnvOrString("MQTTS_URL", ""), "url for mqtts server")
|
|
mqttsSkipVerify := flag.Bool("mqtts_skip_verify", lookupEnvOrBool("MQTTS_SKIP_VERIFY", false), "skip verification of server certificate for mqtts")
|
|
mqttClientId := flag.String("mqtt_client_id", lookupEnvOrString("MQTT_CLIENT_ID", "mqtt-adapter"), "client id for mqtt")
|
|
mqttUsername := flag.String("mqtt_username", lookupEnvOrString("MQTT_USERNAME", "oktopusController"), "username for mqtt")
|
|
mqttQos := flag.Int("mqtt_qos", lookupEnvOrInt("MQTT_QOS", 1), "quality of service for mqtt")
|
|
flHelp := flag.Bool("help", false, "Help")
|
|
|
|
/*
|
|
App variables priority:
|
|
1º - Flag through command line.
|
|
2º - Env variables.
|
|
3º - Default flag value.
|
|
*/
|
|
|
|
flag.Parse()
|
|
|
|
if *flHelp {
|
|
flag.Usage()
|
|
os.Exit(0)
|
|
}
|
|
|
|
ctx := context.TODO()
|
|
|
|
return &Config{
|
|
Nats: Nats{
|
|
Url: *natsUrl,
|
|
Name: *natsName,
|
|
VerifyCertificates: *natsVerifyCertificates,
|
|
Ctx: ctx,
|
|
},
|
|
Mqtt: Mqtt{
|
|
Url: *mqttUrl,
|
|
UrlForTls: *mqttsUrl,
|
|
SkipVerify: *mqttsSkipVerify,
|
|
ClientId: *mqttClientId,
|
|
Username: *mqttUsername,
|
|
Ctx: ctx,
|
|
Qos: *mqttQos,
|
|
},
|
|
}
|
|
}
|
|
|
|
func loadEnvVariables() {
|
|
err := godotenv.Load()
|
|
|
|
if _, err := os.Stat(LOCAL_ENV); err == nil {
|
|
_ = godotenv.Overload(LOCAL_ENV)
|
|
log.Printf("Loaded variables from '%s'", LOCAL_ENV)
|
|
}
|
|
|
|
if err != nil {
|
|
log.Println("Error to load environment variables:", err)
|
|
} else {
|
|
log.Println("Loaded variables from '.env'")
|
|
}
|
|
}
|
|
|
|
func lookupEnvOrString(key string, defaultVal string) string {
|
|
if val, _ := os.LookupEnv(key); val != "" {
|
|
return val
|
|
}
|
|
return defaultVal
|
|
}
|
|
|
|
func lookupEnvOrInt(key string, defaultVal int) int {
|
|
if val, _ := os.LookupEnv(key); val != "" {
|
|
v, err := strconv.Atoi(val)
|
|
if err != nil {
|
|
log.Fatalf("LookupEnvOrInt[%s]: %v", key, err)
|
|
}
|
|
return v
|
|
}
|
|
return defaultVal
|
|
}
|
|
|
|
func lookupEnvOrBool(key string, defaultVal bool) bool {
|
|
if val, _ := os.LookupEnv(key); val != "" {
|
|
v, err := strconv.ParseBool(val)
|
|
if err != nil {
|
|
log.Fatalf("LookupEnvOrBool[%s]: %v", key, err)
|
|
}
|
|
return v
|
|
}
|
|
return defaultVal
|
|
}
|