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Reintroduce OpenCensus trace bridge #3098
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MrAlias
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open-telemetry:new_sdk/main
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dashpole:restore_oc_trace
Aug 19, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| # OpenCensus Bridge | ||
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| The OpenCensus Bridge helps facilitate the migration of an application from OpenCensus to OpenTelemetry. | ||
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| ## Caveat about OpenCensus | ||
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| Installing a metric or tracing bridge will cause OpenCensus telemetry to be exported by OpenTelemetry exporters. Since OpenCensus telemetry uses globals, installing a bridge will result in telemetry collection from _all_ libraries that use OpenCensus, including some you may not expect. For example ([#1928](https://github.com/open-telemetry/opentelemetry-go/issues/1928)), if a client library generates traces with OpenCensus, installing the bridge will cause those traces to be exported by OpenTelemetry. | ||
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| ## Tracing | ||
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| ### The Problem: Mixing OpenCensus and OpenTelemetry libraries | ||
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| In a perfect world, one would simply migrate their entire go application --including custom instrumentation, libraries, and exporters-- from OpenCensus to OpenTelemetry all at once. In the real world, dependency constraints, third-party ownership of libraries, or other reasons may require mixing OpenCensus and OpenTelemetry libraries in a single application. | ||
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| However, if you create the following spans in a go application: | ||
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| ```go | ||
| ctx, ocSpan := opencensus.StartSpan(context.Background(), "OuterSpan") | ||
| defer ocSpan.End() | ||
| ctx, otSpan := opentelemetryTracer.Start(ctx, "MiddleSpan") | ||
| defer otSpan.End() | ||
| ctx, ocSpan := opencensus.StartSpan(ctx, "InnerSpan") | ||
| defer ocSpan.End() | ||
| ``` | ||
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| OpenCensus reports (to OpenCensus exporters): | ||
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| ``` | ||
| [--------OuterSpan------------] | ||
| [----InnerSpan------] | ||
| ``` | ||
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| OpenTelemetry reports (to OpenTelemetry exporters): | ||
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| ``` | ||
| [-----MiddleSpan--------] | ||
| ``` | ||
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| Instead, I would prefer (to a single set of exporters): | ||
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| ``` | ||
| [--------OuterSpan------------] | ||
| [-----MiddleSpan--------] | ||
| [----InnerSpan------] | ||
| ``` | ||
|
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| ### The bridge solution | ||
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| The bridge implements the OpenCensus trace API using OpenTelemetry. This would cause, for example, a span recorded with OpenCensus' `StartSpan()` method to be equivalent to recording a span using OpenTelemetry's `tracer.Start()` method. Funneling all tracing API calls to OpenTelemetry APIs results in the desired unified span hierarchy. | ||
|
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| ### User Journey | ||
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| Starting from an application using entirely OpenCensus APIs: | ||
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| 1. Instantiate OpenTelemetry SDK and Exporters | ||
| 2. Override OpenCensus' DefaultTracer with the bridge | ||
| 3. Migrate libraries individually from OpenCensus to OpenTelemetry | ||
| 4. Remove OpenCensus exporters and configuration | ||
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| To override OpenCensus' DefaultTracer with the bridge: | ||
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| ```go | ||
| import ( | ||
| octrace "go.opencensus.io/trace" | ||
| "go.opentelemetry.io/otel/bridge/opencensus" | ||
| "go.opentelemetry.io/otel" | ||
| ) | ||
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| tracer := otel.GetTracerProvider().Tracer("bridge") | ||
| octrace.DefaultTracer = opencensus.NewTracer(tracer) | ||
| ``` | ||
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| Be sure to set the `Tracer` name to your instrumentation package name instead of `"bridge"`. | ||
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| #### Incompatibilities | ||
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| OpenCensus and OpenTelemetry APIs are not entirely compatible. If the bridge finds any incompatibilities, it will log them. Incompatibilities include: | ||
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| * Custom OpenCensus Samplers specified during StartSpan are ignored. | ||
| * Links cannot be added to OpenCensus spans. | ||
| * OpenTelemetry Debug or Deferred trace flags are dropped after an OpenCensus span is created. |
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| // 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. | ||
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| package opencensus // import "go.opentelemetry.io/otel/bridge/opencensus" | ||
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| import ( | ||
| octrace "go.opencensus.io/trace" | ||
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| "go.opentelemetry.io/otel/bridge/opencensus/internal" | ||
| "go.opentelemetry.io/otel/bridge/opencensus/internal/oc2otel" | ||
| "go.opentelemetry.io/otel/bridge/opencensus/internal/otel2oc" | ||
| "go.opentelemetry.io/otel/trace" | ||
| ) | ||
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| // NewTracer returns an implementation of the OpenCensus Tracer interface which | ||
| // uses OpenTelemetry APIs. Using this implementation of Tracer "upgrades" | ||
| // libraries that use OpenCensus to OpenTelemetry to facilitate a migration. | ||
| func NewTracer(tracer trace.Tracer) octrace.Tracer { | ||
| return internal.NewTracer(tracer) | ||
| } | ||
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| // OTelSpanContextToOC converts from an OpenTelemetry SpanContext to an | ||
| // OpenCensus SpanContext, and handles any incompatibilities with the global | ||
| // error handler. | ||
| func OTelSpanContextToOC(sc trace.SpanContext) octrace.SpanContext { | ||
| return otel2oc.SpanContext(sc) | ||
| } | ||
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| // OCSpanContextToOTel converts from an OpenCensus SpanContext to an | ||
| // OpenTelemetry SpanContext. | ||
| func OCSpanContextToOTel(sc octrace.SpanContext) trace.SpanContext { | ||
| return oc2otel.SpanContext(sc) | ||
| } |
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| // 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. | ||
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| // Package opencensus provides a migration bridge from OpenCensus to | ||
| // OpenTelemetry. The NewTracer function should be used to create an | ||
| // OpenCensus Tracer from an OpenTelemetry Tracer. This Tracer can be use in | ||
| // place of any existing OpenCensus Tracer and will generate OpenTelemetry | ||
| // spans for traces. These spans will be exported by the OpenTelemetry | ||
| // TracerProvider the original OpenTelemetry Tracer came from. | ||
| // | ||
| // There are known limitations to this bridge: | ||
| // | ||
| // - The AddLink method for OpenCensus Spans is not compatible with the | ||
| // OpenTelemetry Span. No link can be added to an OpenTelemetry Span once it | ||
| // is started. Any calls to this method for the OpenCensus Span will result | ||
| // in an error being sent to the OpenTelemetry default ErrorHandler. | ||
| // | ||
| // - The NewContext method of the OpenCensus Tracer cannot embed an OpenCensus | ||
| // Span in a context unless that Span was created by that Tracer. | ||
| // | ||
| // - Conversion of custom OpenCensus Samplers to OpenTelemetry is not | ||
| // implemented. An error will be sent to the OpenTelemetry default | ||
| // ErrorHandler if this is attempted. | ||
| package opencensus // import "go.opentelemetry.io/otel/bridge/opencensus" |
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| @@ -0,0 +1,19 @@ | ||
| module go.opentelemetry.io/otel/bridge/opencensus | ||
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| go 1.17 | ||
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| require ( | ||
| go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f | ||
| go.opentelemetry.io/otel v1.9.0 | ||
| go.opentelemetry.io/otel/trace v1.9.0 | ||
| ) | ||
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| require ( | ||
| github.com/go-logr/logr v1.2.3 // indirect | ||
| github.com/go-logr/stdr v1.2.2 // indirect | ||
| github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect | ||
| ) | ||
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| replace go.opentelemetry.io/otel => ../.. | ||
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| replace go.opentelemetry.io/otel/trace => ../../trace |
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| @@ -0,0 +1,58 @@ | ||
| 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/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= | ||
| github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= | ||
| github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | ||
| github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= | ||
| github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0= | ||
| github.com/go-logr/logr v1.2.3/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= | ||
| github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag= | ||
| github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE= | ||
| github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= | ||
| github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 h1:ZgQEtGgCBiWRM39fZuwSd1LwSqqSW0hOdXCYYDX0R3I= | ||
| github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= | ||
| github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= | ||
| github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= | ||
| github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= | ||
| github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU= | ||
| github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg= | ||
| github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= | ||
| github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= | ||
| github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= | ||
| github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4= | ||
| github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY= | ||
| go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f h1:IUmbcoP9XyEXW+R9AbrZgDvaYVfTbISN92Y5RIV+Mx4= | ||
| go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk= | ||
| golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= | ||
| golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= | ||
| golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= | ||
| golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU= | ||
| golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= | ||
| golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= | ||
| golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= | ||
| golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= | ||
| golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= | ||
| golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= | ||
| golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= | ||
| golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= | ||
| golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= | ||
| golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/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 v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= | ||
| golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= | ||
| golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= | ||
| golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= | ||
| 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/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= | ||
| gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= | ||
| gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= | ||
| honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,21 @@ | ||
| // 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 internal // import "go.opentelemetry.io/otel/bridge/opencensus/internal" | ||
|
|
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| import "go.opentelemetry.io/otel" | ||
|
|
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| // Handle is the package level function to handle errors. It can be | ||
| // overwritten for testing. | ||
| var Handle = otel.Handle |
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| // 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 oc2otel // import "go.opentelemetry.io/otel/bridge/opencensus/internal/oc2otel" | ||
|
|
||
| import ( | ||
| octrace "go.opencensus.io/trace" | ||
|
|
||
| "go.opentelemetry.io/otel/attribute" | ||
| ) | ||
|
|
||
| func Attributes(attr []octrace.Attribute) []attribute.KeyValue { | ||
| otelAttr := make([]attribute.KeyValue, len(attr)) | ||
| for i, a := range attr { | ||
| otelAttr[i] = attribute.KeyValue{ | ||
| Key: attribute.Key(a.Key()), | ||
| Value: AttributeValue(a.Value()), | ||
| } | ||
| } | ||
| return otelAttr | ||
| } | ||
|
|
||
| func AttributeValue(ocval interface{}) attribute.Value { | ||
| switch v := ocval.(type) { | ||
| case bool: | ||
| return attribute.BoolValue(v) | ||
| case int64: | ||
| return attribute.Int64Value(v) | ||
| case float64: | ||
| return attribute.Float64Value(v) | ||
| case string: | ||
| return attribute.StringValue(v) | ||
| default: | ||
| return attribute.StringValue("unknown") | ||
| } | ||
| } | ||
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