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[cli] Add utility functions to init mqtt client

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This commit is contained in:
Cyrille Nofficial 2019-12-18 00:06:53 +01:00
parent ad0f5e0d0f
commit 8d6df473d5
1 changed files with 47 additions and 0 deletions
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47
cli/cli.go
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@ -1,6 +1,9 @@
package cli package cli
import ( import (
"flag"
"fmt"
MQTT "github.com/eclipse/paho.mqtt.golang"
"log" "log"
"os" "os"
"os/signal" "os/signal"
@ -46,3 +49,47 @@ func HandleExit(p Part) {
os.Exit(0) os.Exit(0)
}() }()
} }
func InitMqttFlags(defaultClientId string, mqttBroker, username, password, clientId *string, mqttQos *int, mqttRetain *bool) {
SetDefaultValueFromEnv(clientId, "MQTT_CLIENT_ID", defaultClientId)
SetDefaultValueFromEnv(mqttBroker, "MQTT_BROKER", "tcp://127.0.0.1:1883")
flag.StringVar(mqttBroker, "mqtt-broker", *mqttBroker, "Broker Uri, use MQTT_BROKER env if arg not set")
flag.StringVar(username, "mqtt-username", os.Getenv("MQTT_USERNAME"), "Broker Username, use MQTT_USERNAME env if arg not set")
flag.StringVar(password, "mqtt-password", os.Getenv("MQTT_PASSWORD"), "Broker Password, MQTT_PASSWORD env if args not set")
flag.StringVar(clientId, "mqtt-client-id", *clientId, "Mqtt client id, use MQTT_CLIENT_ID env if args not set")
flag.IntVar(mqttQos, "mqtt-qos", *mqttQos, "Qos to pusblish message, use MQTT_QOS env if arg not set")
flag.BoolVar(mqttRetain, "mqtt-retain", *mqttRetain, "Retain mqtt message, if not set, true if MQTT_RETAIN env variable is set")
}
func InitIntFlag(key string, defValue int) int {
var value int
err := SetIntDefaultValueFromEnv(&value, key, defValue)
if err != nil {
log.Panicf("invalid int value: %v", err)
}
return value
}
func Connect(uri, username, password, clientId string) (MQTT.Client, error) {
//create a ClientOptions struct setting the broker address, clientid, turn
//off trace output and set the default message handler
opts := MQTT.NewClientOptions().AddBroker(uri)
opts.SetUsername(username)
opts.SetPassword(password)
opts.SetClientID(clientId)
opts.SetAutoReconnect(true)
opts.SetDefaultPublishHandler(
//define a function for the default message handler
func(client MQTT.Client, msg MQTT.Message) {
fmt.Printf("TOPIC: %s\n", msg.Topic())
fmt.Printf("MSG: %s\n", msg.Payload())
})
//create and start a client using the above ClientOptions
client := MQTT.NewClient(opts)
if token := client.Connect(); token.Wait() && token.Error() != nil {
return nil, fmt.Errorf("unable to connect to mqtt bus: %v", token.Error())
}
return client, nil
}