dom/telegraf
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Rework mqtt_consumer connect/reconnect (#4846)

Browse Source
This commit is contained in:
Daniel Nelson
2018-10-15 13:03:52 -07:00
committed by GitHub
parent f259229a35
commit 152365ae06
2 changed files with 68 additions and 161 deletions
Download Patch File Download Diff File Expand all files Collapse all files

123
plugins/inputs/mqtt_consumer/mqtt_consumer.go
View File

@@ -1,10 +1,10 @@
package mqtt_consumer
import (
"errors"
"fmt"
"log"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf"
@@ -19,6 +19,14 @@ import (
// 30 Seconds is the default used by paho.mqtt.golang
var defaultConnectionTimeout = internal.Duration{Duration: 30 * time.Second}
type ConnectionState int
const (
Disconnected ConnectionState = iota
Connecting
Connected
)
type MQTTConsumer struct {
Servers []string
Topics []string
@@ -36,16 +44,10 @@ type MQTTConsumer struct {
ClientID string `toml:"client_id"`
tls.ClientConfig
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
connected bool
client mqtt.Client
acc telegraf.Accumulator
state ConnectionState
subscribed bool
}
var sampleConfig = `
@@ -110,22 +112,19 @@ func (m *MQTTConsumer) SetParser(parser parsers.Parser) {
}
func (m *MQTTConsumer) Start(acc telegraf.Accumulator) error {
m.Lock()
defer m.Unlock()
m.connected = false
m.state = Disconnected
if m.PersistentSession && m.ClientID == "" {
return fmt.Errorf("ERROR MQTT Consumer: When using persistent_session" +
" = true, you MUST also set client_id")
return errors.New("persistent_session requires client_id")
}
m.acc = acc
if m.QoS > 2 || m.QoS < 0 {
return fmt.Errorf("MQTT Consumer, invalid QoS value: %d", m.QoS)
return fmt.Errorf("qos value must be 0, 1, or 2: %d", m.QoS)
}
if m.ConnectionTimeout.Duration < 1*time.Second {
return fmt.Errorf("MQTT Consumer, invalid connection_timeout value: %s", m.ConnectionTimeout.Duration)
return fmt.Errorf("connection_timeout must be greater than 1s: %s", m.ConnectionTimeout.Duration)
}
opts, err := m.createOpts()
@@ -134,9 +133,7 @@ func (m *MQTTConsumer) Start(acc telegraf.Accumulator) error {
}
m.client = mqtt.NewClient(opts)
m.in = make(chan mqtt.Message, 1000)
m.done = make(chan struct{})
m.state = Connecting
m.connect()
return nil
@@ -145,80 +142,68 @@ func (m *MQTTConsumer) Start(acc telegraf.Accumulator) error {
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)
m.state = Disconnected
return err
}
go m.receiver()
log.Printf("I! [inputs.mqtt_consumer]: connected %v", m.Servers)
m.state = Connected
return nil
}
func (m *MQTTConsumer) onConnect(c mqtt.Client) {
log.Printf("I! MQTT Client Connected")
if !m.PersistentSession || !m.connected {
// Only subscribe on first connection when using persistent sessions. On
// subsequent connections the subscriptions should be stored in the
// session, but the proper way to do this is to check the connection
// response to ensure a session was found.
if !m.PersistentSession || !m.subscribed {
topics := make(map[string]byte)
for _, topic := range m.Topics {
topics[topic] = byte(m.QoS)
}
subscribeToken := c.SubscribeMultiple(topics, m.recvMessage)
subscribeToken := m.client.SubscribeMultiple(topics, m.recvMessage)
subscribeToken.Wait()
if subscribeToken.Error() != nil {
m.acc.AddError(fmt.Errorf("E! MQTT Subscribe Error\ntopics: %s\nerror: %s",
m.acc.AddError(fmt.Errorf("subscription error: topics: %s: %v",
strings.Join(m.Topics[:], ","), subscribeToken.Error()))
}
m.connected = true
m.subscribed = true
}
return
return nil
}
func (m *MQTTConsumer) onConnectionLost(c mqtt.Client, err error) {
m.acc.AddError(fmt.Errorf("E! MQTT Connection lost\nerror: %s\nMQTT Client will try to reconnect", err.Error()))
m.acc.AddError(fmt.Errorf("connection lost: %v", err))
log.Printf("D! [inputs.mqtt_consumer]: disconnected %v", m.Servers)
m.state = Disconnected
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 {
m.acc.AddError(fmt.Errorf("E! MQTT Parse Error\nmessage: %s\nerror: %s",
string(msg.Payload()), err.Error()))
}
func (m *MQTTConsumer) recvMessage(c mqtt.Client, msg mqtt.Message) {
topic := msg.Topic()
metrics, err := m.parser.Parse(msg.Payload())
if err != nil {
m.acc.AddError(err)
}
for _, metric := range metrics {
tags := metric.Tags()
tags["topic"] = topic
m.acc.AddFields(metric.Name(), metric.Fields(), tags, metric.Time())
}
}
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()
if m.connected {
close(m.done)
if m.state == Connected {
log.Printf("D! [inputs.mqtt_consumer]: disconnecting %v", m.Servers)
m.client.Disconnect(200)
m.connected = false
log.Printf("D! [inputs.mqtt_consumer]: disconnected %v", m.Servers)
m.state = Disconnected
}
}
func (m *MQTTConsumer) Gather(acc telegraf.Accumulator) error {
if !m.connected {
if m.state == Disconnected {
m.state = Connecting
log.Printf("D! [inputs.mqtt_consumer]: connecting %v", m.Servers)
m.connect()
}
@@ -261,7 +246,7 @@ func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) {
for _, server := range m.Servers {
// Preserve support for host:port style servers; deprecated in Telegraf 1.4.4
if !strings.Contains(server, "://") {
log.Printf("W! mqtt_consumer server %q should be updated to use `scheme://host:port` format", server)
log.Printf("W! [inputs.mqtt_consumer] server %q should be updated to use `scheme://host:port` format", server)
if tlsCfg == nil {
server = "tcp://" + server
} else {
@@ -271,10 +256,9 @@ func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) {
opts.AddBroker(server)
}
opts.SetAutoReconnect(true)
opts.SetAutoReconnect(false)
opts.SetKeepAlive(time.Second * 60)
opts.SetCleanSession(!m.PersistentSession)
opts.SetOnConnectHandler(m.onConnect)
opts.SetConnectionLostHandler(m.onConnectionLost)
return opts, nil
@@ -284,6 +268,7 @@ func init() {
inputs.Add("mqtt_consumer", func() telegraf.Input {
return &MQTTConsumer{
ConnectionTimeout: defaultConnectionTimeout,
state: Disconnected,
}
})
}