From 7a79932b7534cf71c54e11d29cfacb0ed5473cc6 Mon Sep 17 00:00:00 2001 From: David Ashpole Date: Tue, 20 Sep 2022 19:42:20 +0000 Subject: [PATCH] reintroduce opencensus bridge example --- .github/dependabot.yml | 9 +++ CHANGELOG.md | 1 + example/opencensus/go.mod | 38 +++++++++ example/opencensus/go.sum | 99 +++++++++++++++++++++++ example/opencensus/main.go | 155 +++++++++++++++++++++++++++++++++++++ 5 files changed, 302 insertions(+) create mode 100644 example/opencensus/go.mod create mode 100644 example/opencensus/go.sum create mode 100644 example/opencensus/main.go diff --git a/.github/dependabot.yml b/.github/dependabot.yml index 34db1abf1e9..e1ae982eb5c 100644 --- a/.github/dependabot.yml +++ b/.github/dependabot.yml @@ -73,6 +73,15 @@ updates: schedule: interval: weekly day: sunday + - package-ecosystem: gomod + directory: /example/opencensus + labels: + - dependencies + - go + - Skip Changelog + schedule: + interval: weekly + day: sunday - package-ecosystem: gomod directory: /example/otel-collector labels: diff --git a/CHANGELOG.md b/CHANGELOG.md index 40953d25784..03ea381e10f 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -11,6 +11,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm ### Added - The metric portion of the OpenCensus bridge (`go.opentelemetry.io/otel/bridge/opencensus`) has been reintroduced. (#3192) +- The OpenCensus bridge example (`go.opentelemetry.io/otel/example/opencensus`) has been reintroduced. (#3206) ## [0.32.0] Revised Metric SDK (Alpha) - 2022-09-18 diff --git a/example/opencensus/go.mod b/example/opencensus/go.mod new file mode 100644 index 00000000000..10a5b0b57dc --- /dev/null +++ b/example/opencensus/go.mod @@ -0,0 +1,38 @@ +module go.opentelemetry.io/otel/example/opencensus + +go 1.18 + +replace ( + go.opentelemetry.io/otel => ../.. + go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus + go.opentelemetry.io/otel/sdk => ../../sdk +) + +require ( + go.opencensus.io v0.23.0 + go.opentelemetry.io/otel v1.10.0 + go.opentelemetry.io/otel/bridge/opencensus v0.31.0 + go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.31.0 + go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.9.0 + go.opentelemetry.io/otel/sdk v1.10.0 + go.opentelemetry.io/otel/sdk/metric v0.32.0 +) + +require ( + github.com/go-logr/logr v1.2.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect + go.opentelemetry.io/otel/metric v0.32.0 // indirect + go.opentelemetry.io/otel/trace v1.10.0 // indirect + golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7 // indirect +) + +replace go.opentelemetry.io/otel/metric => ../../metric + +replace go.opentelemetry.io/otel/sdk/metric => ../../sdk/metric + +replace go.opentelemetry.io/otel/trace => ../../trace + +replace go.opentelemetry.io/otel/exporters/stdout/stdoutmetric => ../../exporters/stdout/stdoutmetric + +replace go.opentelemetry.io/otel/exporters/stdout/stdouttrace => ../../exporters/stdout/stdouttrace diff --git a/example/opencensus/go.sum b/example/opencensus/go.sum new file mode 100644 index 00000000000..c7ddc1e1307 --- /dev/null +++ b/example/opencensus/go.sum @@ -0,0 +1,99 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod 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00000000000..c35c47cac09 --- /dev/null +++ b/example/opencensus/main.go @@ -0,0 +1,155 @@ +// Copyright The OpenTelemetry Authors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package main + +import ( + "context" + "fmt" + "log" + "time" + + ocmetric "go.opencensus.io/metric" + "go.opencensus.io/metric/metricdata" + "go.opencensus.io/metric/metricexport" + "go.opencensus.io/metric/metricproducer" + "go.opencensus.io/stats" + "go.opencensus.io/stats/view" + "go.opencensus.io/tag" + octrace "go.opencensus.io/trace" + + "go.opentelemetry.io/otel" + "go.opentelemetry.io/otel/bridge/opencensus" + "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric" + "go.opentelemetry.io/otel/exporters/stdout/stdouttrace" + "go.opentelemetry.io/otel/sdk/metric" + "go.opentelemetry.io/otel/sdk/resource" + sdktrace "go.opentelemetry.io/otel/sdk/trace" +) + +var ( + // instrumenttype differentiates between our gauge and view metrics. + keyType = tag.MustNewKey("instrumenttype") + // Counts the number of lines read in from standard input. + countMeasure = stats.Int64("test_count", "A count of something", stats.UnitDimensionless) + countView = &view.View{ + Name: "test_count", + Measure: countMeasure, + Description: "A count of something", + Aggregation: view.Count(), + TagKeys: []tag.Key{keyType}, + } +) + +func main() { + log.Println("Using OpenTelemetry stdout exporters.") + traceExporter, err := stdouttrace.New(stdouttrace.WithPrettyPrint()) + if err != nil { + log.Fatal(fmt.Errorf("error creating trace exporter: %w", err)) + } + metricsExporter, err := stdoutmetric.New() + if err != nil { + log.Fatal(fmt.Errorf("error creating metric exporter: %w", err)) + } + tracing(traceExporter) + if err := monitoring(metricsExporter); err != nil { + log.Fatal(err) + } +} + +// tracing demonstrates overriding the OpenCensus DefaultTracer to send spans +// to the OpenTelemetry exporter by calling OpenCensus APIs. +func tracing(otExporter sdktrace.SpanExporter) { + ctx := context.Background() + + log.Println("Configuring OpenCensus. Not Registering any OpenCensus exporters.") + octrace.ApplyConfig(octrace.Config{DefaultSampler: octrace.AlwaysSample()}) + + tp := sdktrace.NewTracerProvider(sdktrace.WithBatcher(otExporter)) + otel.SetTracerProvider(tp) + + log.Println("Installing the OpenCensus bridge to make OpenCensus libraries write spans using OpenTelemetry.") + tracer := tp.Tracer("simple") + octrace.DefaultTracer = opencensus.NewTracer(tracer) + tp.ForceFlush(ctx) + + log.Println("Creating OpenCensus span, which should be printed out using the OpenTelemetry stdouttrace exporter.\n-- It should have no parent, since it is the first span.") + ctx, outerOCSpan := octrace.StartSpan(ctx, "OpenCensusOuterSpan") + outerOCSpan.End() + tp.ForceFlush(ctx) + + log.Println("Creating OpenTelemetry span\n-- It should have the OpenCensus span as a parent, since the OpenCensus span was written with using OpenTelemetry APIs.") + ctx, otspan := tracer.Start(ctx, "OpenTelemetrySpan") + otspan.End() + tp.ForceFlush(ctx) + + log.Println("Creating OpenCensus span, which should be printed out using the OpenTelemetry stdouttrace exporter.\n-- It should have the OpenTelemetry span as a parent, since it was written using OpenTelemetry APIs") + _, innerOCSpan := octrace.StartSpan(ctx, "OpenCensusInnerSpan") + innerOCSpan.End() + tp.ForceFlush(ctx) +} + +// monitoring demonstrates creating an IntervalReader using the OpenTelemetry +// exporter to send metrics to the exporter by using either an OpenCensus +// registry or an OpenCensus view. +func monitoring(otExporter metric.Exporter) error { + log.Println("Using the OpenTelemetry stdoutmetric exporter to export OpenCensus metrics. This allows routing telemetry from both OpenTelemetry and OpenCensus to a single exporter.") + ocExporter := opencensus.NewMetricExporter(otExporter, resource.Default()) + intervalReader, err := metricexport.NewIntervalReader(&metricexport.Reader{}, ocExporter) + if err != nil { + return fmt.Errorf("failed to create interval reader: %w", err) + } + intervalReader.ReportingInterval = 10 * time.Second + log.Println("Emitting metrics using OpenCensus APIs. These should be printed out using the OpenTelemetry stdoutmetric exporter.") + err = intervalReader.Start() + if err != nil { + return fmt.Errorf("failed to start interval reader: %w", err) + } + defer intervalReader.Stop() + + log.Println("Registering a gauge metric using an OpenCensus registry.") + r := ocmetric.NewRegistry() + metricproducer.GlobalManager().AddProducer(r) + gauge, err := r.AddInt64Gauge( + "test_gauge", + ocmetric.WithDescription("A gauge for testing"), + ocmetric.WithConstLabel(map[metricdata.LabelKey]metricdata.LabelValue{ + {Key: keyType.Name()}: metricdata.NewLabelValue("gauge"), + }), + ) + if err != nil { + return fmt.Errorf("failed to add gauge: %w", err) + } + entry, err := gauge.GetEntry() + if err != nil { + return fmt.Errorf("failed to get gauge entry: %w", err) + } + + log.Println("Registering a cumulative metric using an OpenCensus view.") + if err := view.Register(countView); err != nil { + return fmt.Errorf("failed to register views: %w", err) + } + ctx, err := tag.New(context.Background(), tag.Insert(keyType, "view")) + if err != nil { + return fmt.Errorf("failed to set tag: %w", err) + } + for i := int64(1); true; i++ { + // update stats for our gauge + entry.Set(i) + // update stats for our view + stats.Record(ctx, countMeasure.M(1)) + time.Sleep(time.Second) + } + return nil +}