telegraf/plugins/inputs/mqtt_consumer/mqtt_consumer.go

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package mqtt_consumer
import (
"fmt"
"log"
"strings"
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"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"
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)
// 30 Seconds is the default used by paho.mqtt.golang
var defaultConnectionTimeout = internal.Duration{Duration: 30 * time.Second}
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type MQTTConsumer struct {
Servers []string
Topics []string
Username string
Password string
QoS int `toml:"qos"`
ConnectionTimeout internal.Duration `toml:"connection_timeout"`
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parser parsers.Parser
// Legacy metric buffer support
MetricBuffer int
PersistentSession bool
ClientID string `toml:"client_id"`
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// 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
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// channel of all incoming raw mqtt messages
in chan mqtt.Message
done chan struct{}
// keep the accumulator internally:
acc telegraf.Accumulator
connected bool
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}
var sampleConfig = `
servers = ["localhost:1883"]
## MQTT QoS, must be 0, 1, or 2
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qos = 0
## Connection timeout for initial connection in seconds
connection_timeout = "30s"
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## Topics to subscribe to
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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.
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# username = "telegraf"
# password = "metricsmetricsmetricsmetrics"
## Optional SSL Config
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# 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
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# insecure_skip_verify = false
## Data format to consume.
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## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
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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 {
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m.Lock()
defer m.Unlock()
m.connected = 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
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if m.QoS > 2 || m.QoS < 0 {
return fmt.Errorf("MQTT Consumer, invalid QoS value: %d", m.QoS)
}
if m.ConnectionTimeout.Duration < 1*time.Second {
return fmt.Errorf("MQTT Consumer, invalid connection_timeout value: %s", m.ConnectionTimeout.Duration)
}
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opts, err := m.createOpts()
if err != nil {
return err
}
m.client = mqtt.NewClient(opts)
m.in = make(chan mqtt.Message, 1000)
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m.done = make(chan struct{})
m.connect()
return nil
}
func (m *MQTTConsumer) connect() error {
if token := m.client.Connect(); token.Wait() && token.Error() != nil {
err := token.Error()
log.Printf("D! MQTT Consumer, connection error - %v", err)
return err
}
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go m.receiver()
return nil
}
func (m *MQTTConsumer) onConnect(c mqtt.Client) {
log.Printf("I! MQTT Client Connected")
if !m.PersistentSession || !m.connected {
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 {
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m.acc.AddError(fmt.Errorf("E! MQTT Subscribe Error\ntopics: %s\nerror: %s",
strings.Join(m.Topics[:], ","), subscribeToken.Error()))
}
m.connected = true
}
return
}
func (m *MQTTConsumer) onConnectionLost(c mqtt.Client, err error) {
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m.acc.AddError(fmt.Errorf("E! MQTT Connection lost\nerror: %s\nMQTT Client will try to reconnect", err.Error()))
return
}
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// 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 {
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m.acc.AddError(fmt.Errorf("E! MQTT Parse Error\nmessage: %s\nerror: %s",
string(msg.Payload()), err.Error()))
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}
for _, metric := range metrics {
tags := metric.Tags()
tags["topic"] = topic
m.acc.AddFields(metric.Name(), metric.Fields(), tags, metric.Time())
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}
}
}
}
func (m *MQTTConsumer) recvMessage(_ mqtt.Client, msg mqtt.Message) {
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m.in <- msg
}
func (m *MQTTConsumer) Stop() {
m.Lock()
defer m.Unlock()
if m.connected {
close(m.done)
m.client.Disconnect(200)
m.connected = false
}
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}
func (m *MQTTConsumer) Gather(acc telegraf.Accumulator) error {
if !m.connected {
m.connect()
}
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return nil
}
func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) {
opts := mqtt.NewClientOptions()
opts.ConnectTimeout = m.ConnectionTimeout.Duration
if m.ClientID == "" {
opts.SetClientID("Telegraf-Consumer-" + internal.RandomString(5))
} else {
opts.SetClientID(m.ClientID)
}
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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 != "" {
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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)
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return opts, nil
}
func init() {
inputs.Add("mqtt_consumer", func() telegraf.Input {
return &MQTTConsumer{
ConnectionTimeout: defaultConnectionTimeout,
}
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})
}