feat(outputs.mqtt): Add client trace logging, resolve MQTT5 reconnect login (#15429)

plugins/common/mqtt/mqtt.go

@@ -35,6 +35,7 @@ type MqttConfig struct {
 	KeepAlive           int64              `toml:"keep_alive"`
 	PersistentSession   bool               `toml:"persistent_session"`
 	PublishPropertiesV5 *PublishProperties `toml:"v5"`
+	ClientTrace         bool               `toml:"client_trace"`
 
 	tls.ClientConfig
 

plugins/common/mqtt/mqtt_logger.go

@@ -1,4 +1,4 @@
-package mqtt_consumer
+package mqtt
 
 import (
 	"github.com/influxdata/telegraf"

plugins/common/mqtt/mqtt_v3.go

@@ -7,6 +7,7 @@ import (
 	mqttv3 "github.com/eclipse/paho.mqtt.golang" // Library that supports v3.1.1
 
 	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/logger"
 )
 
 type mqttv311Client struct {
@@ -77,6 +78,14 @@ func NewMQTTv311Client(cfg *MqttConfig) (*mqttv311Client, error) {
 		opts.AddBroker(broker)
 	}
 
+	if cfg.ClientTrace {
+		log := &mqttLogger{logger.NewLogger("paho", "", "")}
+		mqttv3.ERROR = log
+		mqttv3.CRITICAL = log
+		mqttv3.WARN = log
+		mqttv3.DEBUG = log
+	}
+
 	return &mqttv311Client{
 		client:  mqttv3.NewClient(opts),
 		timeout: time.Duration(cfg.Timeout),

plugins/common/mqtt/mqtt_v5.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/logger"
 )
 
 type mqttv5Client struct {
@@ -22,6 +23,7 @@ type mqttv5Client struct {
 	timeout     time.Duration
 	qos         int
 	retain      bool
+	clientTrace bool
 	properties  *mqttv5.PublishProperties
 }
 
@@ -101,6 +103,7 @@ func NewMQTTv5Client(cfg *MqttConfig) (*mqttv5Client, error) {
 		qos:         cfg.QoS,
 		retain:      cfg.Retain,
 		properties:  properties,
+		clientTrace: cfg.ClientTrace,
 	}, nil
 }
 
@@ -115,8 +118,14 @@ func (m *mqttv5Client) Connect() (bool, error) {
 		return false, fmt.Errorf("getting password failed: %w", err)
 	}
 	defer pass.Destroy()
-	m.options.ConnectUsername = user.TemporaryString()
-	m.options.ConnectPassword = pass.Bytes()
+	m.options.ConnectUsername = user.String()
+	m.options.ConnectPassword = []byte(pass.String())
+
+	if m.clientTrace {
+		log := mqttLogger{logger.NewLogger("paho", "", "")}
+		m.options.Debug = log
+		m.options.Errors = log
+	}
 
 	client, err := mqttv5auto.NewConnection(context.Background(), m.options)
 	if err != nil {

plugins/inputs/mqtt_consumer/mqtt_consumer.go

@@ -73,7 +73,6 @@ type MQTTConsumer struct {
 	Password               config.Secret        `toml:"password"`
 	QoS                    int                  `toml:"qos"`
 	ConnectionTimeout      config.Duration      `toml:"connection_timeout"`
-	ClientTrace            bool                 `toml:"client_trace"`
 	MaxUndeliveredMessages int                  `toml:"max_undelivered_messages"`
 	PersistentSession      bool                 `toml:"persistent_session"`
 	ClientID               string               `toml:"client_id"`
@@ -105,14 +104,6 @@ func (m *MQTTConsumer) SetParser(parser telegraf.Parser) {
 	m.parser = parser
 }
 func (m *MQTTConsumer) Init() error {
-	if m.ClientTrace {
-		log := &mqttLogger{m.Log}
-		mqtt.ERROR = log
-		mqtt.CRITICAL = log
-		mqtt.WARN = log
-		mqtt.DEBUG = log
-	}
-
 	m.state = Disconnected
 	if m.PersistentSession && m.ClientID == "" {
 		return errors.New("persistent_session requires client_id")

plugins/outputs/mqtt/README.md

@@ -102,6 +102,12 @@ to use them.
   ## actually reads it
   # retain = false
 
+  ## Client trace messages
+  ## When set to true, and debug mode enabled in the agent settings, the MQTT
+  ## client's messages are included in telegraf logs. These messages are very
+  ## noisey, but essential for debugging issues.
+  # client_trace = false
+
   ## Layout of the topics published.
   ## The following choices are available:
   ##   non-batch -- send individual messages, one for each metric

plugins/outputs/mqtt/sample.conf

@@ -67,6 +67,12 @@
   ## actually reads it
   # retain = false
 
+  ## Client trace messages
+  ## When set to true, and debug mode enabled in the agent settings, the MQTT
+  ## client's messages are included in telegraf logs. These messages are very
+  ## noisey, but essential for debugging issues.
+  # client_trace = false
+
   ## Layout of the topics published.
   ## The following choices are available:
   ##   non-batch -- send individual messages, one for each metric