MQTT Consumer ServiceInput plugin

plugins/inputs/all/all.go

@@ -19,6 +19,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/mailchimp"
 	_ "github.com/influxdata/telegraf/plugins/inputs/memcached"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mongodb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mqtt_consumer"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mysql"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nginx"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nsq"

plugins/inputs/kafka_consumer/kafka_consumer.go

@@ -17,16 +17,18 @@ type Kafka struct {
 	Topics         []string
 	ZookeeperPeers []string
 	Consumer       *consumergroup.ConsumerGroup
-	PointBuffer    int
-	Offset         string
+	MetricBuffer   int
+	// TODO remove PointBuffer, legacy support
+	PointBuffer int
+	Offset      string
 
 	sync.Mutex
 
 	// channel for all incoming kafka messages
 	in <-chan *sarama.ConsumerMessage
 	// channel for all kafka consumer errors
 	errs <-chan *sarama.ConsumerError
-	// channel for all incoming parsed kafka points
+	// channel for all incoming parsed kafka metrics
 	metricC chan telegraf.Metric
 	done    chan struct{}
 
@@ -42,8 +44,8 @@ var sampleConfig = `
   zookeeper_peers = ["localhost:2181"]
   # the name of the consumer group
   consumer_group = "telegraf_metrics_consumers"
-  # Maximum number of points to buffer between collection intervals
-  point_buffer = 100000
+  # Maximum number of metrics to buffer between collection intervals
+  metric_buffer = 100000
   # Offset (must be either "oldest" or "newest")
   offset = "oldest"
 `
@@ -90,10 +92,13 @@ func (k *Kafka) Start() error {
 	}
 
 	k.done = make(chan struct{})
-	if k.PointBuffer == 0 {
-		k.PointBuffer = 100000
+	if k.PointBuffer == 0 && k.MetricBuffer == 0 {
+		k.MetricBuffer = 100000
+	} else if k.PointBuffer > 0 {
+		// Legacy support of PointBuffer field TODO remove
+		k.MetricBuffer = k.PointBuffer
 	}
-	k.metricC = make(chan telegraf.Metric, k.PointBuffer)
+	k.metricC = make(chan telegraf.Metric, k.MetricBuffer)
 
 	// Start the kafka message reader
 	go k.parser()
@@ -124,7 +129,7 @@ func (k *Kafka) parser() {
 					continue
 				default:
 					log.Printf("Kafka Consumer buffer is full, dropping a metric." +
-						" You may want to increase the point_buffer setting")
+						" You may want to increase the metric_buffer setting")
 				}
 			}
 
@@ -151,10 +156,10 @@ func (k *Kafka) Stop() {
 func (k *Kafka) Gather(acc telegraf.Accumulator) error {
 	k.Lock()
 	defer k.Unlock()
-	npoints := len(k.metricC)
-	for i := 0; i < npoints; i++ {
-		point := <-k.metricC
-		acc.AddFields(point.Name(), point.Fields(), point.Tags(), point.Time())
+	nmetrics := len(k.metricC)
+	for i := 0; i < nmetrics; i++ {
+		metric := <-k.metricC
+		acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
 	}
 	return nil
 }

plugins/inputs/mqtt_consumer/README.md

@@ -0,0 +1,39 @@
+# mqtt_consumer Input Plugin
+
+The example plugin gathers metrics about example things
+
+### Configuration:
+
+```
+# Description
+[[inputs.example]]
+  # SampleConfig
+```
+
+### Measurements & Fields:
+
+<optional description>
+
+- measurement1
+    - field1 (type, unit)
+    - field2 (float, percent)
+- measurement2
+    - field3 (integer, bytes)
+
+### Tags:
+
+- All measurements have the following tags:
+    - tag1 (optional description)
+    - tag2
+- measurement2 has the following tags:
+    - tag3
+
+### Example Output:
+
+Give an example `-test` output here
+
+```
+$ ./telegraf -config telegraf.conf -input-filter example -test
+measurement1,tag1=foo,tag2=bar field1=1i,field2=2.1 1453831884664956455
+measurement2,tag1=foo,tag2=bar,tag3=baz field3=1i 1453831884664956455
+```

plugins/inputs/mqtt_consumer/mqtt_consumer.go

@@ -0,0 +1,201 @@
+package mqtt_consumer
+
+import (
+	"fmt"
+	"log"
+	"sync"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/plugins/inputs"
+
+	"git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git"
+)
+
+type MQTTConsumer struct {
+	Servers      []string
+	Topics       []string
+	Username     string
+	Password     string
+	MetricBuffer int
+
+	// 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 for all incoming parsed mqtt metrics
+	metricC chan telegraf.Metric
+	done    chan struct{}
+	in      chan []byte
+}
+
+var sampleConfig = `
+  servers = ["localhost:1883"]
+
+  ### Topics to subscribe to
+  topics = [
+    "telegraf/host01/cpu",
+    "telegraf/host02/mem",
+  ]
+
+  ### Maximum number of metrics to buffer between collection intervals
+  metric_buffer = 100000
+
+  ### 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
+`
+
+func (m *MQTTConsumer) SampleConfig() string {
+	return sampleConfig
+}
+
+func (m *MQTTConsumer) Description() string {
+	return "Read line-protocol metrics from MQTT topic(s)"
+}
+
+func (m *MQTTConsumer) Start() error {
+	m.Lock()
+	defer m.Unlock()
+
+	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 []byte, m.MetricBuffer)
+	m.done = make(chan struct{})
+	if m.MetricBuffer == 0 {
+		m.MetricBuffer = 100000
+	}
+	m.metricC = make(chan telegraf.Metric, m.MetricBuffer)
+
+	topics := make(map[string]byte)
+	for _, topic := range m.Topics {
+		topics[topic] = byte(0)
+	}
+	subscribeToken := m.client.SubscribeMultiple(topics, m.recvMessage)
+	subscribeToken.Wait()
+	if subscribeToken.Error() != nil {
+		return subscribeToken.Error()
+	}
+
+	go m.parser()
+
+	return nil
+}
+
+func (m *MQTTConsumer) parser() {
+	for {
+		select {
+		case <-m.done:
+			return
+		case msg := <-m.in:
+			metrics, err := telegraf.ParseMetrics(msg)
+			if err != nil {
+				log.Printf("Could not parse MQTT message: %s, error: %s",
+					string(msg), err.Error())
+			}
+
+			for _, metric := range metrics {
+				select {
+				case m.metricC <- metric:
+					continue
+				default:
+					log.Printf("MQTT Consumer buffer is full, dropping a metric." +
+						" You may want to increase the metric_buffer setting")
+				}
+			}
+		}
+	}
+}
+
+func (m *MQTTConsumer) recvMessage(_ *mqtt.Client, msg mqtt.Message) {
+	m.in <- msg.Payload()
+}
+
+func (m *MQTTConsumer) Stop() {
+	m.Lock()
+	defer m.Unlock()
+	close(m.done)
+	m.client.Disconnect(200)
+}
+
+func (m *MQTTConsumer) Gather(acc telegraf.Accumulator) error {
+	m.Lock()
+	defer m.Unlock()
+	nmetrics := len(m.metricC)
+	for i := 0; i < nmetrics; i++ {
+		metric := <-m.metricC
+		acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
+	}
+	return nil
+}
+
+func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) {
+	opts := mqtt.NewClientOptions()
+
+	opts.SetClientID("Telegraf-Consumer-" + internal.RandomString(5))
+
+	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)
+	// Setting KeepAlive to 0 disables it.
+	// TODO set KeepAlive to a real value (60s?) when this change is merged:
+	// https://git.eclipse.org/r/#/c/65850/
+	opts.SetKeepAlive(time.Duration(0))
+	return opts, nil
+}
+
+func init() {
+	inputs.Add("mqtt_consumer", func() telegraf.Input {
+		return &MQTTConsumer{}
+	})
+}

plugins/inputs/mqtt_consumer/mqtt_consumer_test.go

@@ -0,0 +1 @@
+package mqtt_consumer

plugins/outputs/mqtt/mqtt.go

@@ -11,9 +11,6 @@ import (
 	"github.com/influxdata/telegraf/plugins/outputs"
 )
 
-const MaxRetryCount = 3
-const ClientIdPrefix = "telegraf"
-
 type MQTT struct {
 	Servers     []string `toml:"servers"`
 	Username    string