sandbox: instrument HTTP handlers with StackDriver
This change adds OpenCensus's HTTP instrumentation to the sandbox. In
development mode, it exposes a prometheus metrics interface on /statusz.
This is the first in a series of CLs to add instrumentation to different
parts of the sandbox to help investigate instability issues. For now,
reporting metrics around our responses per handler to StackDriver will
be helpful.
OpenTelemetry would be preferable, as it is the successor of OpenCensus,
however the StackDriver integration is not quite done.
Updates golang/go#25224
Updates golang/go#38530
Change-Id: I600fd695bb66c8bee16bc0b778d51930f4cdd476
Reviewed-on: https://go-review.googlesource.com/c/playground/+/229679
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/go.mod b/go.mod
index b5c0073..8973383 100644
--- a/go.mod
+++ b/go.mod
@@ -3,12 +3,20 @@
go 1.12
require (
- cloud.google.com/go v0.38.0
+ cloud.google.com/go v0.54.0
+ cloud.google.com/go/datastore v1.1.0
+ cloud.google.com/go/pubsub v1.3.1 // indirect
+ contrib.go.opencensus.io/exporter/prometheus v0.1.0
+ contrib.go.opencensus.io/exporter/stackdriver v0.13.1
github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668
- github.com/google/go-cmp v0.3.0
+ github.com/google/go-cmp v0.4.0
+ go.opencensus.io v0.22.3
golang.org/x/build v0.0.0-20190709001953-30c0e6b89ea0
golang.org/x/mod v0.2.0
golang.org/x/tools v0.0.0-20200420001825-978e26b7c37c
- google.golang.org/api v0.4.0
+ google.golang.org/api v0.20.0
+ google.golang.org/genproto v0.0.0-20200312145019-da6875a35672
+ gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+ gopkg.in/yaml.v2 v2.2.7 // indirect
grpc.go4.org v0.0.0-20170609214715-11d0a25b4919
)
diff --git a/go.sum b/go.sum
index eaab44e..da9e9cb 100644
--- a/go.sum
+++ b/go.sum
@@ -2,100 +2,307 @@
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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@@ -105,20 +312,82 @@
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+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.1 h1:zvIju4sqAGvwKspUQOhwnpcqSbzi7/H6QomNNjTL4sk=
+google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.28.0 h1:bO/TA4OxCOummhSf10siHuG7vJOiwh7SpRpFZDkOgl4=
+google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
+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/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/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
+gopkg.in/yaml.v2 v2.2.2/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=
grpc.go4.org v0.0.0-20170609214715-11d0a25b4919 h1:tmXTu+dfa+d9Evp8NpJdgOy6+rt8/x4yG7qPBrtNfLY=
grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
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=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/sandbox/Dockerfile b/sandbox/Dockerfile
index f2da1d5..bd32b1e 100644
--- a/sandbox/Dockerfile
+++ b/sandbox/Dockerfile
@@ -6,6 +6,11 @@
FROM golang:1.14 AS build
+COPY go.mod /go/src/playground/go.mod
+COPY go.sum /go/src/playground/go.sum
+WORKDIR /go/src/playground
+RUN go mod download
+
COPY . /go/src/playground
WORKDIR /go/src/playground/sandbox
RUN go install
diff --git a/sandbox/metrics.go b/sandbox/metrics.go
new file mode 100644
index 0000000..9ec454d
--- /dev/null
+++ b/sandbox/metrics.go
@@ -0,0 +1,164 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+ "fmt"
+ "net/http"
+ "time"
+
+ "cloud.google.com/go/compute/metadata"
+ "contrib.go.opencensus.io/exporter/prometheus"
+ "contrib.go.opencensus.io/exporter/stackdriver"
+ "go.opencensus.io/plugin/ochttp"
+ "go.opencensus.io/stats/view"
+ "go.opencensus.io/tag"
+ mrpb "google.golang.org/genproto/googleapis/api/monitoredres"
+)
+
+// Customizations of ochttp views. Views are updated as follows:
+// * The views are prefixed with go-playground-sandbox.
+// * ochttp.KeyServerRoute is added as a tag to label metrics per-route.
+var (
+ ServerRequestCountView = &view.View{
+ Name: "go-playground-sandbox/http/server/request_count",
+ Description: "Count of HTTP requests started",
+ Measure: ochttp.ServerRequestCount,
+ TagKeys: []tag.Key{ochttp.KeyServerRoute},
+ Aggregation: view.Count(),
+ }
+ ServerRequestBytesView = &view.View{
+ Name: "go-playground-sandbox/http/server/request_bytes",
+ Description: "Size distribution of HTTP request body",
+ Measure: ochttp.ServerRequestBytes,
+ TagKeys: []tag.Key{ochttp.KeyServerRoute},
+ Aggregation: ochttp.DefaultSizeDistribution,
+ }
+ ServerResponseBytesView = &view.View{
+ Name: "go-playground-sandbox/http/server/response_bytes",
+ Description: "Size distribution of HTTP response body",
+ Measure: ochttp.ServerResponseBytes,
+ TagKeys: []tag.Key{ochttp.KeyServerRoute},
+ Aggregation: ochttp.DefaultSizeDistribution,
+ }
+ ServerLatencyView = &view.View{
+ Name: "go-playground-sandbox/http/server/latency",
+ Description: "Latency distribution of HTTP requests",
+ Measure: ochttp.ServerLatency,
+ TagKeys: []tag.Key{ochttp.KeyServerRoute},
+ Aggregation: ochttp.DefaultLatencyDistribution,
+ }
+ ServerRequestCountByMethod = &view.View{
+ Name: "go-playground-sandbox/http/server/request_count_by_method",
+ Description: "Server request count by HTTP method",
+ TagKeys: []tag.Key{ochttp.Method, ochttp.KeyServerRoute},
+ Measure: ochttp.ServerRequestCount,
+ Aggregation: view.Count(),
+ }
+ ServerResponseCountByStatusCode = &view.View{
+ Name: "go-playground-sandbox/http/server/response_count_by_status_code",
+ Description: "Server response count by status code",
+ TagKeys: []tag.Key{ochttp.StatusCode, ochttp.KeyServerRoute},
+ Measure: ochttp.ServerLatency,
+ Aggregation: view.Count(),
+ }
+)
+
+// newMetricService initializes a *metricService.
+//
+// The metricService returned is configured to send metric data to StackDriver.
+// When the sandbox is not running on GCE, it will host metrics through a prometheus HTTP handler.
+func newMetricService() (*metricService, error) {
+ err := view.Register(
+ ServerRequestCountView,
+ ServerRequestBytesView,
+ ServerResponseBytesView,
+ ServerLatencyView,
+ ServerRequestCountByMethod,
+ ServerResponseCountByStatusCode)
+ if err != nil {
+ return nil, err
+ }
+
+ if !metadata.OnGCE() {
+ view.SetReportingPeriod(5 * time.Second)
+ pe, err := prometheus.NewExporter(prometheus.Options{})
+ if err != nil {
+ return nil, fmt.Errorf("newMetricsService(): prometheus.NewExporter: %w", err)
+ }
+ view.RegisterExporter(pe)
+ return &metricService{pExporter: pe}, nil
+ }
+
+ projID, err := metadata.ProjectID()
+ if err != nil {
+ return nil, err
+ }
+ zone, err := metadata.Zone()
+ if err != nil {
+ return nil, err
+ }
+ iname, err := metadata.InstanceName()
+ if err != nil {
+ return nil, err
+ }
+
+ sd, err := stackdriver.NewExporter(stackdriver.Options{
+ ProjectID: projID,
+ MonitoredResource: (*monitoredResource)(&mrpb.MonitoredResource{
+ Type: "generic_task",
+ Labels: map[string]string{
+ "instance_id": iname,
+ "job": "go-playground-sandbox",
+ "project_id": projID,
+ "zone": zone,
+ },
+ }),
+ ReportingInterval: time.Minute, // Minimum interval for stackdriver is 1 minute.
+ })
+ if err != nil {
+ return nil, err
+ }
+
+ // Minimum interval for stackdriver is 1 minute.
+ view.SetReportingPeriod(time.Minute)
+ view.RegisterExporter(sd)
+ // Start the metrics exporter.
+ if err := sd.StartMetricsExporter(); err != nil {
+ return nil, err
+ }
+
+ return &metricService{sdExporter: sd}, nil
+}
+
+type metricService struct {
+ sdExporter *stackdriver.Exporter
+ pExporter *prometheus.Exporter
+}
+
+func (m *metricService) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ if m.pExporter != nil {
+ m.pExporter.ServeHTTP(w, r)
+ return
+ }
+ http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+}
+
+func (m *metricService) Stop() {
+ if sde := m.sdExporter; sde != nil {
+ // Flush any unsent data before exiting.
+ sde.Flush()
+
+ sde.StopMetricsExporter()
+ }
+}
+
+// monitoredResource wraps a *mrpb.MonitoredResource to implement the
+// monitoredresource.MonitoredResource interface.
+type monitoredResource mrpb.MonitoredResource
+
+func (r *monitoredResource) MonitoredResource() (resType string, labels map[string]string) {
+ return r.Type, r.Labels
+}
diff --git a/sandbox/sandbox.go b/sandbox/sandbox.go
index f8741b7..f2a49e7 100644
--- a/sandbox/sandbox.go
+++ b/sandbox/sandbox.go
@@ -30,6 +30,8 @@
"syscall"
"time"
+ "go.opencensus.io/plugin/ochttp"
+ "go.opencensus.io/trace"
"golang.org/x/playground/internal"
"golang.org/x/playground/sandbox/sandboxtypes"
)
@@ -116,6 +118,15 @@
runSem = make(chan struct{}, *numWorkers)
go handleSignals()
+ mux := http.NewServeMux()
+
+ if ms, err := newMetricService(); err != nil {
+ log.Printf("Failed to initialize metrics: newMetricService() = _, %v, wanted no error", err)
+ } else {
+ mux.Handle("/statusz", ochttp.WithRouteTag(ms, "/statusz"))
+ defer ms.Stop()
+ }
+
if out, err := exec.Command("docker", "version").CombinedOutput(); err != nil {
log.Fatalf("failed to connect to docker: %v, %s", err, out)
}
@@ -129,14 +140,18 @@
log.Printf("Listening on %s", *listenAddr)
}
- http.HandleFunc("/health", healthHandler)
- http.HandleFunc("/healthz", healthHandler)
- http.HandleFunc("/", rootHandler)
- http.HandleFunc("/run", runHandler)
+ mux.Handle("/health", ochttp.WithRouteTag(http.HandlerFunc(healthHandler), "/health"))
+ mux.Handle("/healthz", ochttp.WithRouteTag(http.HandlerFunc(healthHandler), "/healthz"))
+ mux.Handle("/", ochttp.WithRouteTag(http.HandlerFunc(rootHandler), "/"))
+ mux.Handle("/run", ochttp.WithRouteTag(http.HandlerFunc(runHandler), "/run"))
go makeWorkers()
- httpServer = &http.Server{Addr: *listenAddr}
+ trace.ApplyConfig(trace.Config{DefaultSampler: trace.NeverSample()})
+ httpServer = &http.Server{
+ Addr: *listenAddr,
+ Handler: &ochttp.Handler{Handler: mux},
+ }
log.Fatal(httpServer.ListenAndServe())
}
diff --git a/sandbox/sandbox_test.go b/sandbox/sandbox_test.go
index 7b32ec6..c5ea09a 100644
--- a/sandbox/sandbox_test.go
+++ b/sandbox/sandbox_test.go
@@ -1,3 +1,7 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
package main
import (
