96 lines
2.8 KiB
Go
96 lines
2.8 KiB
Go
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package cli
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import (
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"flag"
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"fmt"
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MQTT "github.com/eclipse/paho.mqtt.golang"
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"log"
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"os"
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"os/signal"
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"strconv"
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"syscall"
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)
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func SetDefaultValueFromEnv(value *string, key string, defaultValue string) {
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if os.Getenv(key) != "" {
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*value = os.Getenv(key)
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} else {
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*value = defaultValue
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}
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}
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func SetIntDefaultValueFromEnv(value *int, key string, defaultValue int) error {
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var sVal string
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if os.Getenv(key) != "" {
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sVal = os.Getenv(key)
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val, err := strconv.Atoi(sVal)
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if err != nil {
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log.Printf("unable to convert string to int: %v", err)
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return err
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}
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*value = val
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} else {
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*value = defaultValue
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}
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return nil
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}
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type Part interface {
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Start() error
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Stop()
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}
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func HandleExit(p Part) {
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, os.Kill, os.Interrupt, syscall.SIGTERM)
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go func() {
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<-signals
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p.Stop()
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os.Exit(0)
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}()
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}
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func InitMqttFlags(defaultClientId string, mqttBroker, username, password, clientId *string, mqttQos *int, mqttRetain *bool) {
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SetDefaultValueFromEnv(clientId, "MQTT_CLIENT_ID", defaultClientId)
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SetDefaultValueFromEnv(mqttBroker, "MQTT_BROKER", "tcp://127.0.0.1:1883")
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flag.StringVar(mqttBroker, "mqtt-broker", *mqttBroker, "Broker Uri, use MQTT_BROKER env if arg not set")
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flag.StringVar(username, "mqtt-username", os.Getenv("MQTT_USERNAME"), "Broker Username, use MQTT_USERNAME env if arg not set")
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flag.StringVar(password, "mqtt-password", os.Getenv("MQTT_PASSWORD"), "Broker Password, MQTT_PASSWORD env if args not set")
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flag.StringVar(clientId, "mqtt-client-id", *clientId, "Mqtt client id, use MQTT_CLIENT_ID env if args not set")
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flag.IntVar(mqttQos, "mqtt-qos", *mqttQos, "Qos to pusblish message, use MQTT_QOS env if arg not set")
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flag.BoolVar(mqttRetain, "mqtt-retain", *mqttRetain, "Retain mqtt message, if not set, true if MQTT_RETAIN env variable is set")
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}
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func InitIntFlag(key string, defValue int) int {
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var value int
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err := SetIntDefaultValueFromEnv(&value, key, defValue)
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if err != nil {
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log.Panicf("invalid int value: %v", err)
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}
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return value
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}
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func Connect(uri, username, password, clientId string) (MQTT.Client, error) {
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//create a ClientOptions struct setting the broker address, clientid, turn
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//off trace output and set the default message handler
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opts := MQTT.NewClientOptions().AddBroker(uri)
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opts.SetUsername(username)
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opts.SetPassword(password)
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opts.SetClientID(clientId)
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opts.SetAutoReconnect(true)
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opts.SetDefaultPublishHandler(
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//define a function for the default message handler
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func(client MQTT.Client, msg MQTT.Message) {
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fmt.Printf("TOPIC: %s\n", msg.Topic())
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fmt.Printf("MSG: %s\n", msg.Payload())
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})
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//create and start a client using the above ClientOptions
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client := MQTT.NewClient(opts)
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if token := client.Connect(); token.Wait() && token.Error() != nil {
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return nil, fmt.Errorf("unable to connect to mqtt bus: %v", token.Error())
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}
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return client, nil
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}
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