Merge pull request BuoyantIO#73 from eddiezane/add_prometheus_to_voti…

…ng_service

Add prometheus to voting service

README.md

@@ -99,6 +99,12 @@ To update the docker images:
 
 1. Update `emojivoto.yml`, `docker-compose.yml`
 
+## Prometheus Metrics
+
+By default the voting service exposes Prometheus metrics about current vote count on port `8801`.
+
+This can be disabled by unsetting the `PROM_PORT` environment variable.
+
 ## Local Development
 
 ### Emojivoto webapp

emojivoto-voting-svc/cmd/server.go

@@ -4,19 +4,25 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"net/http"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/buoyantio/emojivoto/emojivoto-voting-svc/api"
 	"github.com/buoyantio/emojivoto/emojivoto-voting-svc/voting"
-	"google.golang.org/grpc"
+
 	"contrib.go.opencensus.io/exporter/ocagent"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"go.opencensus.io/plugin/ocgrpc"
 	"go.opencensus.io/trace"
+	"google.golang.org/grpc"
 )
 
 var (
-	grpcPort = os.Getenv("GRPC_PORT")
+	grpcPort    = os.Getenv("GRPC_PORT")
+	promPort    = os.Getenv("PROM_PORT")
 	ocagentHost = os.Getenv("OC_AGENT_HOST")
 )
 
@@ -28,7 +34,7 @@ func main() {
 
 	oce, err := ocagent.NewExporter(
 		ocagent.WithInsecure(),
-		ocagent.WithReconnectionPeriod(5 * time.Second),
+		ocagent.WithReconnectionPeriod(5*time.Second),
 		ocagent.WithAddress(ocagentHost),
 		ocagent.WithServiceName("voting"))
 	if err != nil {
@@ -43,8 +49,34 @@ func main() {
 		panic(err)
 	}
 
-	grpcServer := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
-	api.NewGrpServer(grpcServer, poll)
-	log.Printf("Starting grpc server on GRPC_PORT=[%s]", grpcPort)
-	grpcServer.Serve(lis)
+	errs := make(chan error, 1)
+
+	if promPort != "" {
+		// Start prometheus server
+		go func() {
+			log.Printf("Starting prom metrics on PROM_PORT=[%s]", promPort)
+			http.Handle("/metrics", promhttp.Handler())
+			err := http.ListenAndServe(fmt.Sprintf(":%s", promPort), nil)
+			errs <- err
+		}()
+	}
+
+	// Start grpc server
+	go func() {
+		grpcServer := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
+		api.NewGrpServer(grpcServer, poll)
+		log.Printf("Starting grpc server on GRPC_PORT=[%s]", grpcPort)
+		err := grpcServer.Serve(lis)
+		errs <- err
+	}()
+
+	// Catch shutdown
+	go func() {
+		sig := make(chan os.Signal, 1)
+		signal.Notify(sig, syscall.SIGINT, syscall.SIGQUIT)
+		s := <-sig
+		errs <- fmt.Errorf("caught signal %v", s)
+	}()
+
+	log.Fatal(<-errs)
 }

emojivoto-voting-svc/voting/poll.go

@@ -4,6 +4,9 @@ import (
 	"log"
 	"sort"
 	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
 type Result struct {
@@ -27,6 +30,7 @@ type Poll interface {
 type inMemoryPoll struct {
 	votes map[string]int
 	sync.RWMutex
+	counter *prometheus.CounterVec
 }
 
 func (p *inMemoryPoll) Vote(choice string) error {
@@ -38,6 +42,7 @@ func (p *inMemoryPoll) Vote(choice string) error {
 	} else {
 		p.votes[choice] = 1
 	}
+	p.counter.With(prometheus.Labels{"emoji": choice}).Inc()
 	log.Printf("Voted for [%s], which now has a total of [%d] votes", choice, p.votes[choice])
 	return nil
 }
@@ -57,8 +62,15 @@ func (p *inMemoryPoll) Results() ([]*Result, error) {
 	return results, nil
 }
 
+var counter *prometheus.CounterVec = promauto.NewCounterVec(prometheus.CounterOpts{
+	Name: "emojivoto_votes_total",
+	Help: "Number of emoji votes",
+}, []string{"emoji"})
+
 func NewPoll() Poll {
-	return &inMemoryPoll{
-		votes: make(map[string]int, 0),
+	poll := &inMemoryPoll{
+		votes:   make(map[string]int, 0),
+		counter: counter,
 	}
+	return poll
 }

go.mod

@@ -5,6 +5,7 @@ go 1.13
 require (
 	contrib.go.opencensus.io/exporter/ocagent v0.6.0
 	github.com/golang/protobuf v1.3.2
+	github.com/prometheus/client_golang v1.2.1
 	go.opencensus.io v0.22.1
 	google.golang.org/grpc v1.22.0
 )

go.sum

@@ -4,10 +4,28 @@ cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSR
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 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7 h1:rTIdg5QFRR7XCaK4LCjBiPbx8j4DQRpdYMnGn/bJUEU=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -67,12 +125,17 @@ golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/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 v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7 h1:LepdCS8Gf/MVejFIt8lsiexZATdoGVyp5bcyS+rYoUI=
 golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/ntt0swNk5oYBziWeTCvY=
+golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -103,9 +166,13 @@ google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZi
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.22.0 h1:J0UbZOIrCAl+fpTOf8YLs4dJo8L/owV4LYVtAXQoPkw=
 google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+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 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+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=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

kustomize/deployment/voting.yml

@@ -24,11 +24,15 @@ spec:
       - env:
         - name: GRPC_PORT
           value: "8080"
+        - name: PROM_PORT
+          value: "8801"
         image: buoyantio/emojivoto-voting-svc:v9
         name: voting-svc
         ports:
         - containerPort: 8080
           name: grpc
+        - containerPort: 8801
+          name: prom
         resources:
           requests:
             cpu: 100m
@@ -45,3 +49,6 @@ spec:
   - name: grpc
     port: 8080
     targetPort: 8080
+  - name: prom
+    port: 8801
+    targetPort: 8801