Add simple HTTP metrics for both requests and outputs

Author: Zack Lin

Dockerfile

@@ -20,7 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-FROM golang:alpine as builder
+FROM golang:1.13.5-alpine as builder
 
 ENV GOOS=linux
 ENV GOARCH=amd64

config/config.go

@@ -200,7 +200,7 @@ func LoadConfigFile(filename string) (Config, error) {
 	if err == nil {
 		for i, r := range cfg.HTTPRelays {
 			for j, b := range r.Outputs {
-				if b.Location[len(b.Location) - 1] == '/' {
+				if b.Location[len(b.Location)-1] == '/' {
 					cfg.HTTPRelays[i].Outputs[j].Endpoints = checkDoubleSlash(b.Endpoints)
 				}
 			}

go.mod

@@ -3,11 +3,13 @@ module github.com/strike-team/influxdb-relay
 go 1.13
 
 require (
-	github.com/google/go-cmp v0.3.1 // indirect
+	contrib.go.opencensus.io/exporter/prometheus v0.1.1-0.20191218042359-6151c48ac7fa
 	github.com/influxdata/influxdb v1.7.9
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/naoina/go-stringutil v0.1.0 // indirect
 	github.com/naoina/toml v0.1.1
+	github.com/prometheus/client_golang v1.3.0
 	github.com/stretchr/testify v1.4.0
+	go.opencensus.io v0.22.2
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
 )

go.sum

@@ -1,23 +1,145 @@
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+golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191113165036-4c7a9d0fe056/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191220142924-d4481acd189f h1:68K/z8GLUxV76xGSqwTWw2gyk/jwn79LUL43rES2g8o=
+golang.org/x/sys v0.0.0-20191220142924-d4481acd189f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0 h1:/5xXl8Y5W96D+TtHSlonuFqGHIWVuyCkGJLwGh9JJFs=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 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=

metric/metric.go

@@ -0,0 +1,111 @@
+package metric
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	ocprom "contrib.go.opencensus.io/exporter/prometheus"
+	"github.com/prometheus/client_golang/prometheus"
+	"go.opencensus.io/plugin/ochttp"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/tag"
+)
+
+const (
+	defaultAddr              = ":8088"
+	defaultShutdownTimeoutMs = 5000
+)
+
+type Server struct {
+	h  *http.Server
+	pe *ocprom.Exporter
+}
+
+func init() {
+	registerDefaultServerViews()
+	registerDefaultClientViews()
+}
+
+func (s *Server) Run() error {
+	mux := http.NewServeMux()
+	mux.Handle("/metrics", s.pe)
+
+	s.h.Handler = mux
+	if err := s.h.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		return err
+	}
+	return nil
+}
+
+func (s *Server) Stop() error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*defaultShutdownTimeoutMs)
+	defer cancel()
+	return s.h.Shutdown(ctx)
+}
+
+func NewServer() (*Server, error) {
+	promExporter, err := ocprom.NewExporter(
+		ocprom.Options{
+			Registerer: prometheus.DefaultRegisterer,
+			Gatherer:   prometheus.DefaultGatherer,
+		})
+	if err != nil {
+		return nil, err
+	}
+	view.RegisterExporter(promExporter)
+
+	return &Server{
+		h:  &http.Server{Addr: defaultAddr},
+		pe: promExporter,
+	}, nil
+}
+
+func HTTPHandler(h http.Handler) http.Handler {
+	return &ochttp.Handler{
+		Handler: h,
+	}
+}
+
+func HTTPTransport(base *http.Transport) http.RoundTripper {
+	return &ochttp.Transport{
+		Base: base,
+	}
+}
+
+func registerDefaultServerViews() {
+	views := []*view.View{
+		ochttp.ServerRequestCountView,
+		ochttp.ServerRequestBytesView,
+		ochttp.ServerResponseBytesView,
+		ochttp.ServerLatencyView,
+		ochttp.ServerRequestCountByMethod,
+		ochttp.ServerResponseCountByStatusCode,
+	}
+	for _, view := range views {
+		view.TagKeys = []tag.Key{
+			ochttp.Path,
+			ochttp.Method,
+			ochttp.StatusCode,
+		}
+	}
+	view.Register(views...)
+}
+
+func registerDefaultClientViews() {
+	views := []*view.View{
+		ochttp.ClientSentBytesDistribution,
+		ochttp.ClientReceivedBytesDistribution,
+		ochttp.ClientRoundtripLatencyDistribution,
+		ochttp.ClientCompletedCount,
+	}
+	for _, view := range views {
+		view.TagKeys = []tag.Key{
+			ochttp.KeyClientHost,
+			ochttp.KeyClientPath,
+			ochttp.KeyClientMethod,
+			ochttp.KeyClientStatus,
+		}
+	}
+	view.Register(views...)
+}

relay/http.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"golang.org/x/time/rate"
 	"io/ioutil"
 	"log"
 	"net"
@@ -19,8 +18,11 @@ import (
 	"sync/atomic"
 	"time"
 
+	"golang.org/x/time/rate"
+
 	"github.com/influxdata/influxdb/models"
 	"github.com/strike-team/influxdb-relay/config"
+	"github.com/strike-team/influxdb-relay/metric"
 )
 
 // HTTP is a relay for HTTP influxdb writes
@@ -175,7 +177,7 @@ func (h *HTTP) Run() error {
 		h.logger.Printf("starting %s relay %q on %v", strings.ToUpper(h.schema), h.Name(), h.addr)
 	}
 
-	err = http.Serve(l, h)
+	err = http.Serve(l, metric.HTTPHandler(h))
 	if atomic.LoadInt64(&h.closing) != 0 {
 		return nil
 	}
@@ -237,7 +239,6 @@ func jsonResponse(w http.ResponseWriter, r response) {
 }
 
 type stats interface {
-
 }
 
 type poster interface {
@@ -266,7 +267,7 @@ func newSimplePoster(location string, timeout time.Duration, skipTLSVerification
 	return &simplePoster{
 		client: &http.Client{
 			Timeout:   timeout,
-			Transport: transport,
+			Transport: metric.HTTPTransport(transport),
 		},
 		location: location,
 	}

relayservice/relayservice.go

@@ -6,12 +6,14 @@ import (
 	"sync"
 
 	"github.com/strike-team/influxdb-relay/config"
+	"github.com/strike-team/influxdb-relay/metric"
 	"github.com/strike-team/influxdb-relay/relay"
 )
 
 // Service is a map of relays
 type Service struct {
 	relays map[string]relay.Relay
+	ms     *metric.Server
 }
 
 // New loads the different relays from the configuration file
@@ -41,6 +43,12 @@ func New(config config.Config) (*Service, error) {
 		s.relays[u.Name()] = u
 	}
 
+	ms, err := metric.NewServer()
+	if err != nil {
+		return nil, err
+	}
+	s.ms = ms
+
 	return s, nil
 }
 
@@ -62,6 +70,15 @@ func (s *Service) Run() {
 		}()
 	}
 
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+
+		if err := s.ms.Run(); err != nil {
+			log.Printf("Error running metric server: %v", err)
+		}
+	}()
+
 	wg.Wait()
 }
 
@@ -70,4 +87,6 @@ func (s *Service) Stop() {
 	for _, v := range s.relays {
 		v.Stop()
 	}
+
+	s.ms.Stop()
 }