Export client metrics to Prometheus (#317)

* Export client metrics to Prometheus

* Added missing messagesReceived.Inc()

go.mod

@@ -9,9 +9,11 @@ require (
 	github.com/gogo/protobuf v1.3.1
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/klauspost/compress v1.10.8
+	github.com/kr/pretty v0.2.0 // indirect
 	github.com/pierrec/lz4 v2.0.5+incompatible
 	github.com/pkg/errors v0.8.1
-	github.com/sirupsen/logrus v1.4.1
+	github.com/prometheus/client_golang v1.7.1
+	github.com/sirupsen/logrus v1.4.2
 	github.com/spaolacci/murmur3 v1.1.0
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3 // indirect

go.sum

@@ -1,46 +1,106 @@
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@@ -58,24 +118,36 @@ github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJy
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+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 h1:I6FyU15t786LL7oL/hn43zqTuEGr4PN7F4XJ1p4E3Y8=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa h1:KIDDMLT1O0Nr7TSxp8xM5tJcdn8tgyAONntO829og1M=
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1 h1:ogLJMz+qpzav7lGMh10LMvAkM/fAoGlaiiHYiFYdm80=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190808195139-e713427fea3f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
@@ -84,11 +156,15 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
 gopkg.in/square/go-jose.v2 v2.4.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

perf/pulsar-perf-go.go

@@ -24,17 +24,20 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"os/signal"
+	"strconv"
 
 	"github.com/spf13/cobra"
 
 	log "github.com/sirupsen/logrus"
 
 	"github.com/apache/pulsar-client-go/pulsar"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 // FlagProfile is a global flag
 var FlagProfile bool
 var flagDebug bool
+var PrometheusPort int
 
 type ClientArgs struct {
 	ServiceURL string
@@ -71,13 +74,22 @@ func main() {
 
 	flags := rootCmd.PersistentFlags()
 	flags.BoolVar(&FlagProfile, "profile", false, "enable profiling")
+	flags.IntVar(&PrometheusPort, "metrics", 8000, "Port to use to export metrics for Prometheus. Use -1 to disable.")
 	flags.BoolVar(&flagDebug, "debug", false, "enable debug output")
 	flags.StringVarP(&clientArgs.ServiceURL, "service-url", "u",
 		"pulsar://localhost:6650", "The Pulsar service URL")
 
 	rootCmd.AddCommand(newProducerCommand())
 	rootCmd.AddCommand(newConsumerCommand())
 
+	if PrometheusPort > 0 {
+		go func() {
+			log.Info("Starting Prometheus metrics at http://localhost:", PrometheusPort, "/metrics")
+			http.Handle("/metrics", promhttp.Handler())
+			http.ListenAndServe(":"+strconv.Itoa(PrometheusPort), nil)
+		}()
+	}
+
 	err := rootCmd.Execute()
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "executing command error=%+v\n", err)

pulsar/consumer_impl.go

@@ -25,12 +25,32 @@ import (
 	"sync"
 	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+
 	log "github.com/sirupsen/logrus"
 
 	"github.com/apache/pulsar-client-go/pulsar/internal"
 	pb "github.com/apache/pulsar-client-go/pulsar/internal/pulsar_proto"
 )
 
+var (
+	consumersOpened = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "pulsar_client_consumers_opened",
+		Help: "Counter of consumers created by the client",
+	})
+
+	consumersClosed = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "pulsar_client_consumers_closed",
+		Help: "Counter of consumers closed by the client",
+	})
+
+	consumersPartitions = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "pulsar_client_consumers_partitions_active",
+		Help: "Counter of individual partitions the consumers are currently active",
+	})
+)
+
 var ErrConsumerClosed = errors.New("consumer closed")
 
 const defaultNackRedeliveryDelay = 1 * time.Minute
@@ -276,12 +296,17 @@ func (c *consumer) internalTopicSubscribeToPartitions() error {
 		return err
 	}
 
+	consumersPartitions.Add(float64(partitionsToAdd))
 	return nil
 }
 
 func topicSubscribe(client *client, options ConsumerOptions, topic string,
 	messageCh chan ConsumerMessage, dlqRouter *dlqRouter) (Consumer, error) {
-	return newInternalConsumer(client, options, topic, messageCh, dlqRouter, false)
+	c, err := newInternalConsumer(client, options, topic, messageCh, dlqRouter, false)
+	if err == nil {
+		consumersOpened.Inc()
+	}
+	return c, err
 }
 
 func (c *consumer) Subscription() string {
@@ -381,6 +406,8 @@ func (c *consumer) Close() {
 		c.ticker.Stop()
 		c.client.handlers.Del(c)
 		c.dlq.close()
+		consumersClosed.Inc()
+		consumersPartitions.Sub(float64(len(c.consumers)))
 	})
 }
 

pulsar/consumer_multitopic.go

@@ -72,6 +72,7 @@ func newMultiTopicConsumer(client *client, options ConsumerOptions, topics []str
 		return nil, errs
 	}
 
+	consumersOpened.Inc()
 	return mtc, nil
 }
 
@@ -165,6 +166,7 @@ func (c *multiTopicConsumer) Close() {
 		wg.Wait()
 		close(c.closeCh)
 		c.dlq.close()
+		consumersClosed.Inc()
 	})
 }