/
mqtt.go
178 lines (160 loc) · 4.23 KB
/
mqtt.go
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package gotag
import (
"errors"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
logger "github.com/sirupsen/logrus"
)
type TpMqtt struct {
MsgQueueBase
log *logger.Logger
c mqtt.Client
ch chan *Tag
topics []string
ontag OnTagCallback
}
func (self *TpMqtt) Publish(topic string, payload []byte) error {
if self.c == nil {
return errors.New("tag client not found")
}
token := self.c.Publish(topic, 0, false, payload)
if token.Wait() && token.Error() != nil {
return token.Error()
}
return nil
}
func (self *TpMqtt) Subscribe(topic string) error {
if self.c == nil {
return errors.New("tag client not found")
}
if self.ontag == nil {
return errors.New("needs to assign a handler before subscribe topics")
}
if token := self.c.Subscribe(topic, 0, self.onMessageReceived); token.Wait() && token.Error() != nil {
return token.Error()
}
// add subscribed topic
for i := range self.topics {
if self.topics[i] == topic {
return nil
}
}
self.topics = append(self.topics, topic)
return nil
}
func (self *TpMqtt) UnSubscribe(topic string) error {
if self.c == nil {
return errors.New("tag client not found")
}
if token := self.c.Unsubscribe(topic); token.Wait() && token.Error() != nil {
return token.Error()
}
// remove unsubscribed topic
for i := range self.topics {
if self.topics[i] == topic {
self.topics = append(self.topics[:i], self.topics[i+1:]...)
break
}
}
return nil
}
func (self *TpMqtt) SubscribeChannel() chan *Tag {
return self.ch
}
func (self *TpMqtt) SubscribeCallback(hnd OnTagCallback) error {
if self.c == nil {
return errors.New("tag client not found")
}
self.ontag = hnd
return nil
}
func (self *TpMqtt) Close() error {
if self.c != nil {
close(self.ch)
self.c.Disconnect(250)
}
return nil
}
func (self *TpMqtt) onMessageReceived(client mqtt.Client, message mqtt.Message) {
if self.ontag == nil {
return
}
if _, _, err := DecodeTopic(message.Topic()); err != nil {
self.log.Errorf("%v: %v", err.Error(), message.Topic())
return
}
t := &Tag{}
if err := DecodePayload(message.Payload(), t); err != nil {
self.log.Errorf("on message received error (%v)", err.Error())
return
}
if self.ontag != nil {
self.ontag(t.SourceName, t.TagName, t.Val, t.ValType, t.Ts, t.Unit)
}
select {
case self.ch <- t:
default:
}
t = nil
}
func (self *TpMqtt) OnConnectHandler(client mqtt.Client) {
self.log.Info("mqtt client connected")
for i := range self.topics {
if token := self.c.Subscribe(self.topics[i], 0, self.onMessageReceived); token.Wait() && token.Error() != nil {
self.log.Warnf("re-subscribe topic (%v) error: %v", self.topics[i], token.Error())
}
}
}
func (self *TpMqtt) OnDisconnectHandler(client mqtt.Client, err error) {
self.log.Info("mqtt client disconnected")
if err != nil {
self.log.Infof("disconnect error (%v)", err)
}
}
func (self *TpMqtt) OnPublishHandler(client mqtt.Client, message mqtt.Message) {
self.log.Infof("Publish topic: %v\n", message.Topic())
self.log.Infof("Publish msg: %v\n", message.Payload())
}
func (self *TpMqtt) SetLogLevel(level string) error {
if level == "info" {
self.log.SetLevel(logger.InfoLevel)
} else if level == "debug" {
self.log.SetLevel(logger.DebugLevel)
} else if level == "warn" {
self.log.SetLevel(logger.WarnLevel)
} else if level == "error" {
self.log.SetLevel(logger.ErrorLevel)
} else {
return errors.New("Level not defined")
}
return nil
}
func newMqtt(cfg *MQConfig) (*TpMqtt, error) {
t := &TpMqtt{
topics: []string{},
ontag: nil,
ch: make(chan *Tag, 512),
log: logger.New(),
}
// set debug log level
t.SetLogLevel(cfg.Debug)
// init mqtt client
opts := mqtt.NewClientOptions()
if cfg.Host == "" {
opts.AddBroker("tcp://" + getEnv("APPMAN_TAGSERVICE_ADDR", "localhost") + ":" + cfg.Port)
} else {
opts.AddBroker("tcp://" + cfg.Host + ":" + cfg.Port)
}
opts.SetClientID(genId(8))
opts.SetKeepAlive(30 * time.Second)
opts.SetMaxReconnectInterval(3)
opts.SetCleanSession(true)
opts.SetOnConnectHandler(t.OnConnectHandler)
opts.SetConnectionLostHandler(t.OnDisconnectHandler)
opts.SetDefaultPublishHandler(t.OnPublishHandler)
t.c = mqtt.NewClient(opts)
if token := t.c.Connect(); token.Wait() && token.Error() != nil {
return nil, token.Error()
}
return t, nil
}