add NewExportPipeline and InstallNewPipeline for otlp

Signed-off-by: binjip978 <binjip978@gmail.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Changed
 
+- Add NewExportPipeline and InstallNewPipeline convince functions (#1347)
 - Move the OpenCensus example into `example` directory. (#1359)
 - `NewExporter` and `Start` functions in `go.opentelemetry.io/otel/exporters/otlp` now receive `context.Context` as a first parameter. (#1357)
 

exporters/otlp/otlp.go

@@ -21,16 +21,24 @@ import (
 	"context"
 	"errors"
 	"sync"
+	"time"
 
 	"google.golang.org/grpc"
 
+	"go.opentelemetry.io/otel"
 	colmetricpb "go.opentelemetry.io/otel/exporters/otlp/internal/opentelemetry-proto-gen/collector/metrics/v1"
 	coltracepb "go.opentelemetry.io/otel/exporters/otlp/internal/opentelemetry-proto-gen/collector/trace/v1"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/transform"
 	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/propagation"
 	metricsdk "go.opentelemetry.io/otel/sdk/export/metric"
 	"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
 	tracesdk "go.opentelemetry.io/otel/sdk/export/trace"
+	"go.opentelemetry.io/otel/sdk/metric/controller/push"
+	"go.opentelemetry.io/otel/sdk/metric/processor/basic"
+	"go.opentelemetry.io/otel/sdk/metric/selector/simple"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 
 // Exporter is an OpenTelemetry exporter. It exports both traces and metrics
@@ -231,3 +239,51 @@ func (e *Exporter) uploadTraces(ctx context.Context, sdl []*tracesdk.SpanData) e
 	}
 	return err
 }
+
+func NewExportPipeline(ctx context.Context, exportOpts []ExporterOption,
+	resOpts []resource.Option) (*Exporter, *sdktrace.TracerProvider, *push.Controller, error) {
+
+	exp, err := NewExporter(ctx, exportOpts...)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	res, err := resource.New(ctx, resOpts...)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	bsp := sdktrace.NewBatchSpanProcessor(exp)
+	tracerProvider := sdktrace.NewTracerProvider(
+		sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
+		sdktrace.WithResource(res),
+		sdktrace.WithSpanProcessor(bsp),
+	)
+
+	pusher := push.New(
+		basic.New(
+			simple.NewWithExactDistribution(),
+			exp,
+		),
+		exp,
+		push.WithPeriod(7*time.Second),
+	)
+
+	return exp, tracerProvider, pusher, nil
+}
+
+func InstallNewPipeline(ctx context.Context, exportOpts []ExporterOption,
+	resOpts []resource.Option) (*Exporter, *sdktrace.TracerProvider, *push.Controller, error) {
+
+	exp, tp, pusher, err := NewExportPipeline(ctx, exportOpts, resOpts)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	otel.SetTextMapPropagator(propagation.TraceContext{})
+	otel.SetTracerProvider(tp)
+	otel.SetMeterProvider(pusher.MeterProvider())
+	pusher.Start()
+
+	return exp, tp, pusher, err
+}

exporters/otlp/otlp_test.go

@@ -20,6 +20,12 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 
 func TestExporterShutdownHonorsTimeout(t *testing.T) {
@@ -113,3 +119,41 @@ func TestExporterShutdownManyTimes(t *testing.T) {
 		}
 	}
 }
+
+func TestInstallNewPipeline(t *testing.T) {
+	ctx := context.Background()
+	_, _, _, err := InstallNewPipeline(ctx, nil, nil)
+	assert.NoError(t, err)
+	assert.IsType(t, &sdktrace.TracerProvider{}, otel.GetTracerProvider())
+}
+
+func TestNewExportPipeline(t *testing.T) {
+	testCases := []struct {
+		name             string
+		expOpts          []ExporterOption
+		resOpts          []resource.Option
+		testSpanSampling bool
+	}{
+		{
+			name: "simple pipeline",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			_, tp, _, err := NewExportPipeline(
+				context.Background(),
+				tc.expOpts,
+				tc.resOpts,
+			)
+
+			assert.NoError(t, err)
+			assert.NotEqual(t, tp, otel.GetTracerProvider())
+
+			_, span := tp.Tracer("otlp test").Start(context.Background(), tc.name)
+			spanCtx := span.SpanContext()
+			assert.Equal(t, true, spanCtx.IsSampled())
+			span.End()
+		})
+	}
+}