Repository: open-telemetry/opentelemetry-go-contrib
Pull request #2753 (2022-09-15 18:47:43)

Add autoexport to automatically configure trace exporters
This PR adds an autoexport package similar to autoprop that can detect and configure trace exporters, or use provided ones if none are set in environment variables.

Note: common exporters (eg otlp, jaeger, etc) cannot be pre-populated into the registry during init because they would not take into account environment variables configured before autoexport is called. This is valuable, as it both supports testing and when combined with the proposed generic config launcher (see below).

- #2592 
- https://github.com/honeycombio/opentelemetry-go-contrib/pull/400

Known limitations:
- Only one exporter per type can be configured, eg a single "otlp" exporter can be configured
- Does not consider metrics exporters yet because they are slightly more complicated because metrics exporters are wrapped by a controller (push / pull)

codecov[bot]: # [Codecov](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) Report
> Merging [#2753](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) (8f220f6) into [main](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/commit/c4876c33a8e2e4b09501013f3543153d8aa10178?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) (c4876c3) will **increase** coverage by `0.0%`.
> The diff coverage is `79.4%`.

> :exclamation: Current head 8f220f6 differs from pull request most recent head ff36a60. Consider uploading reports for the commit ff36a60 to get more accurate results

<details><summary>Additional details and impacted files</summary>


[![Impacted file tree graph](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753/graphs/tree.svg?width=650&height=150&src=pr&token=P6F3W9WA7Q&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry)](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry)

```diff
@@          Coverage Diff          @@
##            main   #2753   +/-   ##
=====================================
  Coverage   74.4%   74.5%           
=====================================
  Files        145     147    +2     
  Lines       6707    6785   +78     
=====================================
+ Hits        4993    5055   +62     
- Misses      1566    1578   +12     
- Partials     148     152    +4     
```


| [Impacted Files](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | |
|---|---|---|
| [exporters/autoexport/exporter.go](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#diff-ZXhwb3J0ZXJzL2F1dG9leHBvcnQvZXhwb3J0ZXIuZ28=) | `64.4% <64.4%> (ø)` | |
| [exporters/autoexport/registry.go](https://codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/2753/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#diff-ZXhwb3J0ZXJzL2F1dG9leHBvcnQvcmVnaXN0cnkuZ28=) | `100.0% <100.0%> (ø)` | |

</details>
MikeGoldsmith: Hey @MrAlias - could you give this another pass for feedback please? Thanks
jmacd: This seems fundamentally different than the `autoprop` package in the sense that it supports registration of span Exporters (a part of a provider), whereas the thing configured in autoprop is a whole provider of propagation functionality. When I consider how to auto-configure a Span exporter, that includes the notion of auto-configuring the processor at the same time. Some span exporters will want to use the batch processor, and some will not--although these are independent interfaces I do not believe they should be auto-configured separately.

So, the thing I expect a registry for auto-configured-span-exporters to return is a `TracerProviderOption` which encapsulates the processor and exporter (i.e., a whole pipeline). Likewise for auto-configuring metrics exporteres, I expect a registry for auto-configured-metric-exporters to configure `MetricReader` instances appropriately for some exporter and return a `MeterProviderOption`.
jmacd: I'm just feeling wary of building automatic-configurators for individual building blocks of the SDK on the assumption that they are always perfectly orthogonal from one another. I would prefer instead of configuring Samplers, Processors, and Exporters independently (for spans) for us to configure feature-level units of code which sometimes means configuring more than one SDK interface with a coordinated implementation. [Here is an example of a combined java-contrib Sampler and Processor implementation.](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/352)
MikeGoldsmith: Thanks for the feedback all, I'll be following up on queries and addressing feedback over the next couple of days.
MikeGoldsmith: I've gone through and addressed all feedback.

Main changes are:
- Used Options pattern for providing fallback exporter
- Updated registry to populate with OTLP exporter during `init()` and simplified retrieval logic
- Added autoexport to dependabot and versions
  - @MrAlias I added to experimental-instrumenations as autoprop was there, let me know if you'd prefer somewhere else
  
Thanks all 😄 
MikeGoldsmith: Hmm - I've had another thought regarding using this package with the proposed go contrib launcher, and am wondering if moving the otlp exporter creation to init is a good idea. It means a vendor who wants to modify settings, eg override the exporter's endpoint, cannot do it before its created.

I think we need to delay creating the default (otlp) exporter until it's requested by calling `SpanExporter()`.
MikeGoldsmith: > Hmm - I've had another thought regarding using this package with the proposed go contrib launcher, and am wondering if moving the otlp exporter creation to init is a good idea. It means a vendor who wants to modify settings, eg override the exporter's endpoint, cannot do it before its created.
> 
> I think we need to delay creating the default (otlp) exporter until it's requested by calling `SpanExporter()`.

Thinking more on this, in the scenario someone wants to alter the default OTLP exporter programatically (eg headers, endpoint, etc) - would we expect them to register a new exporter? Many users of the autoexport package will likely want to alter some settings.

For the launcher when using the OTLP exporter, if we want to edit the endpoint, we'd then have to create a new exporter anyway so makes no sense for using the autoexport package at all.
MikeGoldsmith: > Hmm - I've had another thought regarding using this package with the proposed go contrib launcher, and am wondering if moving the otlp exporter creation to init is a good idea. It means a vendor who wants to modify settings, eg override the exporter's endpoint, cannot do it before its created.
> 
> I think we need to delay creating the default (otlp) exporter until it's requested by calling `SpanExporter()`.

Thinking more on this, in the scenario someone wants to alter the default OTLP exporter programatically (eg headers, endpoint, etc) - would we expect them to register a new exporter? Many users of the autoexport package will likely want to alter some settings.

For the launcher when using the OTLP exporter, if we want to edit the endpoint, we'd then have to create a new exporter anyway so makes no sense for using the autoexport package at all.
MikeGoldsmith: I've talked myself round in a circle. I think what we have is good. If app, or an intermediate layer such as the launcher, wants to provide an alternative exporter configuration other than using env vars, then you should build the exporter and register it 👍🏻 
MikeGoldsmith: @open-telemetry/go-approvers @open-telemetry/go-maintainers  looking for another round of feedback on this PR please 👍🏻
alexrudd: Hey, are there any updates on this? Would be a really great feature :)
MikeGoldsmith: @MrAlias @dashpole I've updated to use a SpanExporter factory instead of maintaining SpanExporter instances. Let me know what you think.
pdelewski: LGTM
MikeGoldsmith: @MrAlias @pellared I've addressed your feedback. Please re-review 👍🏻 
MikeGoldsmith: @pellared How's this?

Patch:
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 6129c4d06..d22c43797 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -190,6 +190,15 @@ updates:
     schedule:
       interval: weekly
       day: sunday
+  - package-ecosystem: gomod
+    directory: /exporters/autoexport
+    labels:
+      - dependencies
+      - go
+      - Skip Changelog
+    schedule:
+      interval: weekly
+      day: sunday
   - package-ecosystem: gomod
     directory: /instrgen
     labels:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eed167ea0..27d8fff9c 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
 
 - Add the new `go.opentelemetry.io/contrib/instrgen` package to provide auto-generated source code instrumentation. (#3068, #3108)
+- The `go.opentelemetry.io/contrib/exporters/autoexport` package to provide configuration of trace exporters with useful defaults and envar support. (#2753)
 
 ## [1.17.0/0.42.0/0.11.0] - 2023-05-23
 
@@ -68,7 +69,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Fixed
 
-- AWS SDK rename attributes `aws.operation`, `aws.service` to `rpc.method`,`rpc.service` in `go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws`. (#3582, #3617) 
+- AWS SDK rename attributes `aws.operation`, `aws.service` to `rpc.method`,`rpc.service` in `go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws`. (#3582, #3617)
 - AWS SDK span name to be of the format `Service.Operation` in `go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws`. (#3582, #3521)
 - Prevent sampler configuration reset from erroneously sampling first span in `go.opentelemetry.io/contrib/samplers/jaegerremote`. (#3603, #3604)
 
diff --git a/CODEOWNERS b/CODEOWNERS
index 77405c5d9..b60284e2e 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -16,7 +16,7 @@
 # instrumentation/net/http/otelhttp/         @open-telemetry/collector-go-approvers @madvikinggod @mralias
 # Path separator and minimum of 1 space between component path and owners is
 # important for validation steps
-# 
+#
 
 * @open-telemetry/go-approvers
 
@@ -25,19 +25,21 @@ CODEOWNERS @MrAlias @Aneurysm9 @MadVikingGod
 detectors/aws/                                                          @open-telemetry/go-approvers @Aneurysm9
 detectors/gcp/                                                          @open-telemetry/go-approvers @dashpole
 
+exporters/autoexport                                                    @open-telemetry/go-approvers @MikeGoldsmith
+
 instrumentation/github.com/astaxie/beego/otelbeego/                     @open-telemetry/go-approvers
 instrumentation/github.com/aws/aws-lambda-go/otellambda/                @open-telemetry/go-approvers @Aneurysm9
 instrumentation/github.com/aws/aws-sdk-go-v2/otelaws/                   @open-telemetry/go-approvers @Aneurysm9
 instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/   @open-telemetry/go-approvers
 instrumentation/github.com/emicklei/go-restful/otelrestful/             @open-telemetry/go-approvers
-instrumentation/github.com/gin-gonic/gin/otelgin/                       @open-telemetry/go-approvers @hanyuancheung 
+instrumentation/github.com/gin-gonic/gin/otelgin/                       @open-telemetry/go-approvers @hanyuancheung
 instrumentation/github.com/go-kit/kit/otelkit/                          @open-telemetry/go-approvers
 instrumentation/github.com/gocql/gocql/otelgocql/                       @open-telemetry/go-approvers
 instrumentation/github.com/gorilla/mux/otelmux/                         @open-telemetry/go-approvers
 instrumentation/github.com/labstack/echo/otelecho/                      @open-telemetry/go-approvers
-instrumentation/github.com/Shopify/sarama/otelsarama/                   @open-telemetry/go-approvers @pellared @hanyuancheung 
+instrumentation/github.com/Shopify/sarama/otelsarama/                   @open-telemetry/go-approvers @pellared @hanyuancheung
 instrumentation/go.mongodb.org/mongo-driver/mongo/otelmongo/            @open-telemetry/go-approvers
-instrumentation/google.golang.org/grpc/otelgrpc/                        @open-telemetry/go-approvers @dashpole @hanyuancheung 
+instrumentation/google.golang.org/grpc/otelgrpc/                        @open-telemetry/go-approvers @dashpole @hanyuancheung
 instrumentation/gopkg.in/macaron.v1/otelmacaron/                        @open-telemetry/go-approvers
 
 instrumentation/host/                                                   @open-telemetry/go-approvers @MadVikingGod
diff --git a/exporters/autoexport/README.md b/exporters/autoexport/README.md
new file mode 100644
index 000000000..e005950de
--- /dev/null
+++ b/exporters/autoexport/README.md
@@ -0,0 +1,22 @@
+# Automatic Exporter configuration
+
+[![Go Reference][goref-image]][goref-url]
+[![Apache License][license-image]][license-url]
+
+This module provides easy access to configuring a trace exporter that can be used when configuring an OpenTelemetry Go SDK trace export pipeline.
+
+## Useful links
+
+- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
+- For more about OpenTelemetry Go: <https://github.com/open-telemetry/opentelemetry-go>
+- For help or feedback on this project, join us in [GitHub Discussions][discussions-url]
+
+## License
+
+Apache 2.0 - See [LICENSE][license-url] for more information.
+
+[license-url]: https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/LICENSE
+[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
+[goref-image]: https://pkg.go.dev/badge/go.opentelemetry.io/contrib/exporters/autoexport.svg
+[goref-url]: https://pkg.go.dev/go.opentelemetry.io/contrib/exporters/autoexport
+[discussions-url]: https://github.com/open-telemetry/opentelemetry-go/discussions
diff --git a/exporters/autoexport/doc.go b/exporters/autoexport/doc.go
new file mode 100644
index 000000000..998108e1b
--- /dev/null
+++ b/exporters/autoexport/doc.go
@@ -0,0 +1,33 @@
+// 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.
+
+// This module provides easy access to configuring a trace exporter
+// that can be used when configuring an OpenTelemetry Go SDK trace export
+// pipeline.
+//
+// [NewSpanExporter] looks for the `OTEL_TRACES_EXPORTER` environment
+// variable and if set, attempts to load the exporter from it's registry of
+// exporters. The registry is always loaded with an OTLP exporter with the key
+// `otlp` and additional exporters can be registered using
+// [RegisterSpanExporter].
+// Exporter registration uses a factory method pattern to not unneccarily build
+// exporters and use resources until they are requested.
+//
+// If the environment variable is not set, the fallback exporter is returned.
+// The fallback exporter defaults to an
+// [OTLP exporter](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp/otlptrace)
+// and can be overridden using the [RegisterSpanExporter](https://pkg.go.dev/go.opentelemetry.io/contrib/exporters/autoexport#WithFallbackSpanExporter)
+// option.
+
+package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
diff --git a/exporters/autoexport/exporter.go b/exporters/autoexport/exporter.go
new file mode 100644
index 000000000..4540c241c
--- /dev/null
+++ b/exporters/autoexport/exporter.go
@@ -0,0 +1,98 @@
+// 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 autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
+
+import (
+	"context"
+	"os"
+
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+const (
+	otelTracesExportersEnvKey = "OTEL_TRACES_EXPORTER"
+)
+
+type config struct {
+	fallbackExporter trace.SpanExporter
+}
+
+func newConfig(ctx context.Context, opts ...Option) (config, error) {
+	cfg := config{}
+	for _, opt := range opts {
+		cfg = opt.apply(cfg)
+	}
+
+	// if no fallback exporter is configured, use otlp exporter
+	if cfg.fallbackExporter == nil {
+		exp, err := spanExporter(context.Background(), "otlp")
+		if err != nil {
+			return cfg, err
+		}
+		cfg.fallbackExporter = exp
+	}
+	return cfg, nil
+}
+
+// Option applies an autoexport configuration option.
+type Option interface {
+	apply(config) config
+}
+
+type optionFunc func(config) config
+
+func (fn optionFunc) apply(cfg config) config {
+	return fn(cfg)
+}
+
+// WithFallbackSpanExporter sets the fallback exporter to use when no exporter
+// is configured through the OTEL_TRACES_EXPORTER environment variable.
+func WithFallbackSpanExporter(exporter trace.SpanExporter) Option {
+	return optionFunc(func(cfg config) config {
+		cfg.fallbackExporter = exporter
+		return cfg
+	})
+}
+
+// NewSpanExporter returns a configured SpanExporter defined using the environment
+// variable OTEL_TRACES_EXPORTER, the configured fallback exporter via options or
+// a default OTLP exporter (in this order).
+func NewSpanExporter(ctx context.Context, opts ...Option) (trace.SpanExporter, error) {
+	// prefer exporter configured via environment variables over exporter
+	// passed in via exporter parameter
+	envExporter, err := makeExporterFromEnv(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if envExporter != nil {
+		return envExporter, nil
+	}
+	config, err := newConfig(ctx, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return config.fallbackExporter, nil
+}
+
+// makeExporterFromEnv returns a configured SpanExporter defined by the OTEL_TRACES_EXPORTER
+// environment variable.
+// nil is returned if no exporter is defined for the environment variable.
+func makeExporterFromEnv(ctx context.Context) (trace.SpanExporter, error) {
+	expType, defined := os.LookupEnv(otelTracesExportersEnvKey)
+	if !defined {
+		return nil, nil
+	}
+	return spanExporter(ctx, expType)
+}
diff --git a/exporters/autoexport/go.mod b/exporters/autoexport/go.mod
new file mode 100644
index 000000000..fd95a91e4
--- /dev/null
+++ b/exporters/autoexport/go.mod
@@ -0,0 +1,33 @@
+module go.opentelemetry.io/contrib/exporters/autoexport
+
+go 1.19
+
+require (
+	github.com/stretchr/testify v1.7.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.10.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.10.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.10.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.10.0
+	go.opentelemetry.io/otel/sdk v1.10.0
+)
+
+require (
+	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.7.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.opentelemetry.io/otel v1.10.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.10.0 // indirect
+	go.opentelemetry.io/otel/trace v1.10.0 // indirect
+	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	golang.org/x/text v0.3.5 // indirect
+	google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1 // indirect
+	google.golang.org/grpc v1.46.2 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)
diff --git a/exporters/autoexport/go.sum b/exporters/autoexport/go.sum
new file mode 100644
index 000000000..edfda1a7b
--- /dev/null
+++ b/exporters/autoexport/go.sum
@@ -0,0 +1,451 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
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diff --git a/exporters/autoexport/registry.go b/exporters/autoexport/registry.go
new file mode 100644
index 000000000..e4ad8050f
--- /dev/null
+++ b/exporters/autoexport/registry.go
@@ -0,0 +1,147 @@
+// 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 autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"sync"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+const (
+	otelExporterOTLPProtoEnvKey = "OTEL_EXPORTER_OTLP_PROTOCOL"
+)
+
+// registry maintains a map of exporter names to SpanExporter factories
+// func(context.Context) (trace.SpanExporter, error) that is safe for concurrent use by multiple
+// goroutines without additional locking or coordination.
+type registry struct {
+	mu    sync.Mutex
+	names map[string]func(context.Context) (trace.SpanExporter, error)
+}
+
+func newRegistry() registry {
+	return registry{
+		names: map[string]func(context.Context) (trace.SpanExporter, error){
+			"":     buildOTLPExporter,
+			"otlp": buildOTLPExporter,
+		},
+	}
+}
+
+var (
+	// envRegistry is the package level registry of exporter registrations
+	// and their mapping to a SpanExporter factory func(context.Context) (trace.SpanExporter, error).
+	envRegistry = newRegistry()
+
+	// errUnknownExporter is returned when an unknown exporter name is used in
+	// the OTEL_*_EXPORTER environment variables.
+	errUnknownExporter = errors.New("unknown exporter")
+
+	// errInvalidOTLPProtocol is returned when an invalid protocol is used in
+	// the OTEL_EXPORTER_OTLP_PROTOCOL environment variable.
+	errInvalidOTLPProtocol = errors.New("invalid OTLP protocol - should be one of ['grpc', 'http/protobuf']")
+
+	// errDuplicateRegistration is returned when an duplicate registration is detected.
+	errDuplicateRegistration = errors.New("duplicate registration")
+)
+
+// load returns tries to find the SpanExporter factory with the key and
+// then execute the factory, returning the created SpanExporter.
+// errUnknownExporter is returned if the registration is missing and the error from
+// executing the factory if not nil.
+func (r *registry) load(ctx context.Context, key string) (trace.SpanExporter, error) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	factory, ok := r.names[key]
+	if !ok {
+		return nil, errUnknownExporter
+	}
+	return factory(ctx)
+}
+
+// store sets the factory for a key if is not already in the registry. errDuplicateRegistration
+// is returned if the registry already contains key.
+func (r *registry) store(key string, factory func(context.Context) (trace.SpanExporter, error)) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if _, ok := r.names[key]; ok {
+		return fmt.Errorf("%w: %q", errDuplicateRegistration, key)
+	}
+	r.names[key] = factory
+	return nil
+}
+
+// drop removes key from the registry if it exists, otherwise nothing.
+func (r *registry) drop(key string) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	delete(r.names, key)
+}
+
+// RegisterSpanExporter sets the SpanExporter factory to be used when the
+// OTEL_TRACES_EXPORTERS environment variable contains the exporter name. This
+// will panic if name has already been registered.
+func RegisterSpanExporter(name string, factory func(context.Context) (trace.SpanExporter, error)) {
+	if err := envRegistry.store(name, factory); err != nil {
+		// envRegistry.store will return errDuplicateRegistration if name is already
+		// registered. Panic here so the user is made aware of the duplicate
+		// registration, which could be done by malicious code trying to
+		// intercept cross-cutting concerns.
+		//
+		// Panic for all other errors as well. At this point there should not
+		// be any other errors returned from the store operation. If there
+		// are, alert the developer that adding them as soon as possible that
+		// they need to be handled here.
+		panic(err)
+	}
+}
+
+// spanExporter returns a span exporter using the passed in name
+// from the list of registered SpanExporters. Each name must match an
+// already registered SpanExporter. A default OTLP exporter is registered
+// under both an empty string "" and "otlp".
+// An error is returned for any unknown exporters.
+func spanExporter(ctx context.Context, name string) (trace.SpanExporter, error) {
+	exp, err := envRegistry.load(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return exp, nil
+}
+
+// buildOTLPExporter creates an OTLP exporter using the environment variable
+// OTEL_EXPORTER_OTLP_PROTOCOL to determine the exporter protocol.
+func buildOTLPExporter(ctx context.Context) (trace.SpanExporter, error) {
+	proto := "grpc"
+	if protoStr, ok := os.LookupEnv(otelExporterOTLPProtoEnvKey); ok {
+		proto = protoStr
+	}
+
+	switch proto {
+	case "grpc":
+		return otlptracegrpc.New(ctx)
+	case "http/protobuf":
+		return otlptracehttp.New(ctx)
+	default:
+		return nil, errInvalidOTLPProtocol
+	}
+}
diff --git a/versions.yaml b/versions.yaml
index 2280b18f0..a0e5f0838 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -30,6 +30,7 @@ module-sets:
     version: v0.42.0
     modules:
       - go.opentelemetry.io/contrib/detectors/aws/lambda
+      - go.opentelemetry.io/contrib/exporters/autoexport
       - go.opentelemetry.io/contrib/propagators/autoprop
       - go.opentelemetry.io/contrib/propagators/opencensus
       - go.opentelemetry.io/contrib/propagators/opencensus/examples


Test patch:
diff --git a/exporters/autoexport/exporter_test.go b/exporters/autoexport/exporter_test.go
new file mode 100644
index 000000000..c010d0fc9
--- /dev/null
+++ b/exporters/autoexport/exporter_test.go
@@ -0,0 +1,64 @@
+// 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 autoexport
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+func TestOTLPExporterReturnedWhenNoEnvOrFallbackExporterConfigured(t *testing.T) {
+	exporter, err := NewSpanExporter(context.Background())
+	assert.Nil(t, err)
+	assert.NotNil(t, exporter)
+	assert.IsType(t, &otlptrace.Exporter{}, exporter)
+}
+
+func TestFallbackExporterReturnedWhenNoEnvExporterConfigured(t *testing.T) {
+	testExporter := &testExporter{}
+	exporter, err := NewSpanExporter(
+		context.Background(),
+		WithFallbackSpanExporter(testExporter),
+	)
+	assert.Nil(t, err)
+	assert.Equal(t, testExporter, exporter)
+}
+
+func TestEnvExporterIsPreferredOverFallbackExporter(t *testing.T) {
+	t.Setenv("OTEL_TRACES_EXPORTER", "otlp")
+
+	testExporter := &testExporter{}
+	exporter, err := NewSpanExporter(
+		context.Background(),
+		WithFallbackSpanExporter(testExporter),
+	)
+	assert.Nil(t, err)
+	assert.IsType(t, &otlptrace.Exporter{}, exporter)
+}
+
+type testExporter struct{}
+
+func (e *testExporter) ExportSpans(ctx context.Context, ss []trace.ReadOnlySpan) error {
+	return nil
+}
+
+func (e *testExporter) Shutdown(ctx context.Context) error {
+	return nil
+}
diff --git a/exporters/autoexport/registry_test.go b/exporters/autoexport/registry_test.go
new file mode 100644
index 000000000..cf7599453
--- /dev/null
+++ b/exporters/autoexport/registry_test.go
@@ -0,0 +1,118 @@
+// 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 autoexport
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+var stdoutFactory = func(ctx context.Context) (trace.SpanExporter, error) {
+	exp, err := stdouttrace.New()
+	if err != nil {
+		return nil, err
+	}
+	return exp, nil
+}
+
+func TestCanStoreExporterFactory(t *testing.T) {
+	r := newRegistry()
+	assert.NotPanics(t, func() {
+		require.NoError(t, r.store("first", stdoutFactory))
+	})
+}
+
+func TestLoadOfUnknownExporterReturnsError(t *testing.T) {
+	r := newRegistry()
+	assert.NotPanics(t, func() {
+		exp, err := r.load(context.Background(), "non-existent")
+		assert.Equal(t, err, errUnknownExporter, "empty registry should hold nothing")
+		assert.Nil(t, exp, "non-nil exporter returned")
+	})
+}
+
+func TestRegistryIsConcurrentSafe(t *testing.T) {
+	const exporterName = "stdout"
+
+	r := newRegistry()
+	assert.NotPanics(t, func() {
+		require.NoError(t, r.store(exporterName, stdoutFactory))
+	})
+
+	go func() {
+		assert.NotPanics(t, func() {
+			require.ErrorIs(t, r.store(exporterName, stdoutFactory), errDuplicateRegistration)
+		})
+	}()
+
+	go func() {
+		assert.NotPanics(t, func() {
+			exp, err := r.load(context.Background(), exporterName)
+			assert.Nil(t, err, "missing exporter in registry")
+			assert.IsType(t, &stdouttrace.Exporter{}, exp)
+		})
+	}()
+}
+
+func TestSubsequentCallsToGetExporterReturnsNewInstances(t *testing.T) {
+	const exporterType = "otlp"
+	exp1, err := spanExporter(context.Background(), exporterType)
+	assert.Nil(t, err)
+	assert.IsType(t, &otlptrace.Exporter{}, exp1)
+
+	exp2, err := spanExporter(context.Background(), exporterType)
+	assert.Nil(t, err)
+	assert.IsType(t, &otlptrace.Exporter{}, exp2)
+	assert.NotSame(t, exp1, exp2)
+}
+
+func TestDefaultOTLPExporterFactoriesAreAutomaticallyRegistered(t *testing.T) {
+	exp1, err := spanExporter(context.Background(), "")
+	assert.Nil(t, err)
+	assert.IsType(t, &otlptrace.Exporter{}, exp1)
+
+	exp2, err := spanExporter(context.Background(), "otlp")
+	assert.Nil(t, err)
+	assert.IsType(t, &otlptrace.Exporter{}, exp2)
+}
+
+func TestEnvRegistryCanRegisterExporterFactory(t *testing.T) {
+	const exporterName = "custom"
+	RegisterSpanExporter(exporterName, stdoutFactory)
+	t.Cleanup(func() { envRegistry.drop(exporterName) })
+
+	exp, err := envRegistry.load(context.Background(), exporterName)
+	assert.Nil(t, err, "missing exporter in envRegistry")
+	assert.IsType(t, &stdouttrace.Exporter{}, exp)
+}
+
+func TestEnvRegistryPanicsOnDuplicateRegisterCalls(t *testing.T) {
+	const exporterName = "custom"
+	RegisterSpanExporter(exporterName, stdoutFactory)
+	t.Cleanup(func() { envRegistry.drop(exporterName) })
+
+	errString := fmt.Sprintf("%s: %q", errDuplicateRegistration, exporterName)
+	assert.PanicsWithError(t, errString, func() {
+		RegisterSpanExporter(exporterName, stdoutFactory)
+	})
+}