113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package mqttdevice
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import (
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"fmt"
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"github.com/cyrilix/robocar-base/mode"
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MQTT "github.com/eclipse/paho.mqtt.golang"
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"io"
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"log"
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)
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type Publisher interface {
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Publish(topic string, payload MqttValue)
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}
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type Subscriber interface {
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Subscribe(topic string, mh MQTT.MessageHandler)
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}
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type MQTTPubSub interface {
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Publisher
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Subscriber
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io.Closer
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}
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type pahoMqttPubSub struct {
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Uri string
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Username string
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Password string
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ClientId string
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Qos int
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Retain bool
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client MQTT.Client
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}
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func NewPahoMqttPubSub(uri string, username string, password string, clientId string, qos int, retain bool) MQTTPubSub {
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p := pahoMqttPubSub{Uri: uri, Username: username, Password: password, ClientId: clientId, Qos: qos, Retain: retain}
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p.Connect()
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return &p
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}
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// Publish message to broker
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func (p *pahoMqttPubSub) Publish(topic string, payload MqttValue) {
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tokenResp := p.client.Publish(topic, byte(p.Qos), p.Retain, string(payload))
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if tokenResp.Error() != nil {
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log.Fatalf("%+v\n", tokenResp.Error())
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}
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}
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// Register func to execute on message
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func (p *pahoMqttPubSub) Subscribe(topic string, callback MQTT.MessageHandler) {
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tokenResp := p.client.Subscribe(topic, byte(p.Qos), callback)
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if tokenResp.Error() != nil {
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log.Fatalf("%+v\n", tokenResp.Error())
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}
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}
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// Close connection to broker
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func (p *pahoMqttPubSub) Close() error {
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p.client.Disconnect(500)
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return nil
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}
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func (p *pahoMqttPubSub) Connect() {
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if p.client != nil && p.client.IsConnected() {
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return
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}
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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(p.Uri)
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opts.SetUsername(p.Username)
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opts.SetPassword(p.Password)
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opts.SetClientID(p.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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p.client = MQTT.NewClient(opts)
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if token := p.client.Connect(); token.Wait() && token.Error() != nil {
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panic(token.Error())
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}
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}
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type MqttValue string
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func NewMqttValue(v interface{}) MqttValue {
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switch val := v.(type) {
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case string:
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return MqttValue(val)
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case float32, float64:
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return MqttValue(fmt.Sprintf("%0.2f", val))
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case int, int8, int16, int32, int64:
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return MqttValue(fmt.Sprintf("%d", val))
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case mode.DriveMode:
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return MqttValue(mode.ToString(val))
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case bool:
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if val {
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return "ON"
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} else {
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return "OFF"
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}
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case MqttValue:
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return val
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default:
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log.Printf("invalid mqtt value: %v", val)
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return ""
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}
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}
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