Changes stdout to expose the *sdktrace.TracerProvider (#1800)

* Changes stdout to expose the actual tracerProvider

This enables flushing and stopping the exporter.

* updated changelog

* Update CHANGELOG.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -72,6 +72,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Make `ExportSpans` in Jaeger Exporter honor context deadline. (#1773)
 - The `go.opentelemetry.io/otel/sdk/export/trace` package is merged into the `go.opentelemetry.io/otel/sdk/trace` package. (#1778)
 - The prometheus.InstallNewPipeline example is moved from comment to example test (#1796)
+- Convenience functions for stdout exporter have been updated to return the `TracerProvider` implementation and enable the shutdown of the exporter. (#1800)
 
 ### Removed
 

exporters/stdout/example_test.go

@@ -81,7 +81,7 @@ func Example() {
 		stdout.WithPrettyPrint(),
 	}
 	// Registers both a trace and meter Provider globally.
-	pusher, err := stdout.InstallNewPipeline(exportOpts, nil)
+	tracerProvider, pusher, err := stdout.InstallNewPipeline(exportOpts, nil)
 	if err != nil {
 		log.Fatal("Could not initialize stdout exporter:", err)
 	}
@@ -92,4 +92,7 @@ func Example() {
 	if err := pusher.Stop(ctx); err != nil {
 		log.Fatal("Could not stop stdout exporter:", err)
 	}
+	if err := tracerProvider.Shutdown(ctx); err != nil {
+		log.Fatal("Could not stop stdout tracer:", err)
+	}
 }

exporters/stdout/exporter.go

@@ -24,7 +24,6 @@ import (
 	processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
 	"go.opentelemetry.io/otel/sdk/metric/selector/simple"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
-	"go.opentelemetry.io/otel/trace"
 )
 
 type Exporter struct {
@@ -51,8 +50,8 @@ func NewExporter(options ...Option) (*Exporter, error) {
 
 // NewExportPipeline creates a complete export pipeline with the default
 // selectors, processors, and trace registration. It is the responsibility
-// of the caller to stop the returned push Controller.
-func NewExportPipeline(exportOpts []Option, pushOpts []controller.Option) (trace.TracerProvider, *controller.Controller, error) {
+// of the caller to stop the returned tracer provider and push Controller.
+func NewExportPipeline(exportOpts []Option, pushOpts []controller.Option) (*sdktrace.TracerProvider, *controller.Controller, error) {
 	exporter, err := NewExporter(exportOpts...)
 	if err != nil {
 		return nil, nil, err
@@ -76,7 +75,7 @@ func NewExportPipeline(exportOpts []Option, pushOpts []controller.Option) (trace
 
 // InstallNewPipeline creates a complete export pipelines with defaults and
 // registers it globally. It is the responsibility of the caller to stop the
-// returned push Controller.
+// returned tracer provider and push Controller.
 //
 // Typically this is called as:
 //
@@ -86,12 +85,12 @@ func NewExportPipeline(exportOpts []Option, pushOpts []controller.Option) (trace
 // 	}
 // 	defer pipeline.Stop()
 // 	... Done
-func InstallNewPipeline(exportOpts []Option, pushOpts []controller.Option) (*controller.Controller, error) {
+func InstallNewPipeline(exportOpts []Option, pushOpts []controller.Option) (*sdktrace.TracerProvider, *controller.Controller, error) {
 	tracerProvider, controller, err := NewExportPipeline(exportOpts, pushOpts)
 	if err != nil {
-		return controller, err
+		return tracerProvider, controller, err
 	}
 	otel.SetTracerProvider(tracerProvider)
 	global.SetMeterProvider(controller.MeterProvider())
-	return controller, err
+	return tracerProvider, controller, err
 }