package mqtt_consumer import ( "fmt" "log" "strings" "sync" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/internal" "github.com/influxdata/telegraf/plugins/inputs" "github.com/influxdata/telegraf/plugins/parsers" "github.com/eclipse/paho.mqtt.golang" ) type MQTTConsumer struct { Servers []string Topics []string Username string Password string QoS int `toml:"qos"` parser parsers.Parser // Legacy metric buffer support MetricBuffer int PersistentSession bool ClientID string `toml:"client_id"` // Path to CA file SSLCA string `toml:"ssl_ca"` // Path to host cert file SSLCert string `toml:"ssl_cert"` // Path to cert key file SSLKey string `toml:"ssl_key"` // Use SSL but skip chain & host verification InsecureSkipVerify bool sync.Mutex client mqtt.Client // channel of all incoming raw mqtt messages in chan mqtt.Message done chan struct{} // keep the accumulator internally: acc telegraf.Accumulator started bool } var sampleConfig = ` servers = ["localhost:1883"] ## MQTT QoS, must be 0, 1, or 2 qos = 0 ## Topics to subscribe to topics = [ "telegraf/host01/cpu", "telegraf/+/mem", "sensors/#", ] # if true, messages that can't be delivered while the subscriber is offline # will be delivered when it comes back (such as on service restart). # NOTE: if true, client_id MUST be set persistent_session = false # If empty, a random client ID will be generated. client_id = "" ## username and password to connect MQTT server. # username = "telegraf" # password = "metricsmetricsmetricsmetrics" ## Optional SSL Config # ssl_ca = "/etc/telegraf/ca.pem" # ssl_cert = "/etc/telegraf/cert.pem" # ssl_key = "/etc/telegraf/key.pem" ## Use SSL but skip chain & host verification # insecure_skip_verify = false ## Data format to consume. ## Each data format has it's own unique set of configuration options, read ## more about them here: ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md data_format = "influx" ` func (m *MQTTConsumer) SampleConfig() string { return sampleConfig } func (m *MQTTConsumer) Description() string { return "Read metrics from MQTT topic(s)" } func (m *MQTTConsumer) SetParser(parser parsers.Parser) { m.parser = parser } func (m *MQTTConsumer) Start(acc telegraf.Accumulator) error { m.Lock() defer m.Unlock() m.started = false if m.PersistentSession && m.ClientID == "" { return fmt.Errorf("ERROR MQTT Consumer: When using persistent_session" + " = true, you MUST also set client_id") } m.acc = acc if m.QoS > 2 || m.QoS < 0 { return fmt.Errorf("MQTT Consumer, invalid QoS value: %d", m.QoS) } opts, err := m.createOpts() if err != nil { return err } m.client = mqtt.NewClient(opts) if token := m.client.Connect(); token.Wait() && token.Error() != nil { return token.Error() } m.in = make(chan mqtt.Message, 1000) m.done = make(chan struct{}) go m.receiver() return nil } func (m *MQTTConsumer) onConnect(c mqtt.Client) { if !m.PersistentSession || !m.started { topics := make(map[string]byte) for _, topic := range m.Topics { topics[topic] = byte(m.QoS) } subscribeToken := c.SubscribeMultiple(topics, m.recvMessage) subscribeToken.Wait() if subscribeToken.Error() != nil { log.Printf("MQTT SUBSCRIBE ERROR\ntopics: %s\nerror: %s", strings.Join(m.Topics[:], ","), subscribeToken.Error()) } m.started = true } return } func (m *MQTTConsumer) onConnectionLost(c mqtt.Client, err error) { log.Printf("MQTT Connection lost\nerror: %s\nClient should retry to reconnect", err.Error()) return } // receiver() reads all incoming messages from the consumer, and parses them into // influxdb metric points. func (m *MQTTConsumer) receiver() { for { select { case <-m.done: return case msg := <-m.in: topic := msg.Topic() metrics, err := m.parser.Parse(msg.Payload()) if err != nil { log.Printf("MQTT PARSE ERROR\nmessage: %s\nerror: %s", string(msg.Payload()), err.Error()) } for _, metric := range metrics { tags := metric.Tags() tags["topic"] = topic m.acc.AddFields(metric.Name(), metric.Fields(), tags, metric.Time()) } } } } func (m *MQTTConsumer) recvMessage(_ mqtt.Client, msg mqtt.Message) { m.in <- msg } func (m *MQTTConsumer) Stop() { m.Lock() defer m.Unlock() close(m.done) m.client.Disconnect(200) m.started = false } func (m *MQTTConsumer) Gather(acc telegraf.Accumulator) error { return nil } func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) { opts := mqtt.NewClientOptions() if m.ClientID == "" { opts.SetClientID("Telegraf-Consumer-" + internal.RandomString(5)) } else { opts.SetClientID(m.ClientID) } tlsCfg, err := internal.GetTLSConfig( m.SSLCert, m.SSLKey, m.SSLCA, m.InsecureSkipVerify) if err != nil { return nil, err } scheme := "tcp" if tlsCfg != nil { scheme = "ssl" opts.SetTLSConfig(tlsCfg) } user := m.Username if user != "" { opts.SetUsername(user) } password := m.Password if password != "" { opts.SetPassword(password) } if len(m.Servers) == 0 { return opts, fmt.Errorf("could not get host infomations") } for _, host := range m.Servers { server := fmt.Sprintf("%s://%s", scheme, host) opts.AddBroker(server) } opts.SetAutoReconnect(true) opts.SetKeepAlive(time.Second * 60) opts.SetCleanSession(!m.PersistentSession) opts.SetOnConnectHandler(m.onConnect) opts.SetConnectionLostHandler(m.onConnectionLost) return opts, nil } func init() { inputs.Add("mqtt_consumer", func() telegraf.Input { return &MQTTConsumer{} }) }