Unify trace and metric exporter helpers (#944)

* Adjust Jaeger and Zipkin exporters helper methods

* Update and add tests, examples, various minor improvements

* Update changelog

* Correct the Zipkin example

- wait for the spans to be exported
- rebuild the example

* Zipkin service name as argument

* Rework Jaeger and Zipkin tests

* Include more detailed Changelog

Co-authored-by: ET <evantorrie@users.noreply.github.com>
Co-authored-by: Liz Fong-Jones <lizf@honeycomb.io>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -8,6 +8,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Changed
+
+- Jaeger exporter helpers: added InstallNewPipeline and removed RegisterGlobal option instead. (#944)
+- Zipkin exporter helpers: pipeline methods introduced, new exporter method adjusted. (#944)
+
 ## [0.9.0] - 2020-07-20
 
 ### Added

example/jaeger/main.go

@@ -30,7 +30,7 @@ import (
 // initTracer creates a new trace provider instance and registers it as global trace provider.
 func initTracer() func() {
 	// Create and install Jaeger export pipeline
-	_, flush, err := jaeger.NewExportPipeline(
+	flush, err := jaeger.InstallNewPipeline(
 		jaeger.WithCollectorEndpoint("http://localhost:14268/api/traces"),
 		jaeger.WithProcess(jaeger.Process{
 			ServiceName: "trace-demo",
@@ -39,7 +39,6 @@ func initTracer() func() {
 				kv.Float64("float", 312.23),
 			},
 		}),
-		jaeger.RegisterAsGlobal(),
 		jaeger.WithSDK(&sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
 	)
 	if err != nil {

example/zipkin/main.go

@@ -33,30 +33,20 @@ var logger = log.New(os.Stderr, "zipkin-example", log.Ldate|log.Ltime|log.Llongf
 
 // initTracer creates a new trace provider instance and registers it as global trace provider.
 func initTracer(url string) {
-	// Create Zipkin Exporter
-	exporter, err := zipkin.NewExporter(
-		url,
-		"zipkin-example",
-		zipkin.WithLogger(logger),
-	)
-	if err != nil {
-		log.Fatal(err)
-	}
-
+	// Create Zipkin Exporter and install it as a global tracer.
+	//
 	// For demoing purposes, always sample. In a production application, you should
-	// configure this to a trace.ProbabilitySampler set at the desired
+	// configure the sampler to a trace.ProbabilitySampler set at the desired
 	// probability.
-	tp, err := sdktrace.NewProvider(
-		sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
-		sdktrace.WithBatcher(exporter,
-			sdktrace.WithBatchTimeout(5),
-			sdktrace.WithMaxExportBatchSize(10),
-		),
+	err := zipkin.InstallNewPipeline(
+		url,
+		"zipkin-test",
+		zipkin.WithLogger(logger),
+		zipkin.WithSDK(&sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
 	)
 	if err != nil {
 		log.Fatal(err)
 	}
-	global.SetTraceProvider(tp)
 }
 
 func main() {
@@ -73,7 +63,9 @@ func main() {
 	bar(ctx)
 	<-time.After(6 * time.Millisecond)
 	span.End()
-	<-time.After(24 * time.Millisecond)
+
+	// Wait for the spans to be exported.
+	<-time.After(5 * time.Second)
 }
 
 func bar(ctx context.Context) {

exporters/trace/jaeger/jaeger.go

@@ -47,10 +47,6 @@ type options struct {
 
 	Config *sdktrace.Config
 
-	// RegisterGlobal is set to true if the trace provider of the new pipeline should be
-	// registered as Global Trace Provider
-	RegisterGlobal bool
-
 	Disabled bool
 }
 
@@ -82,14 +78,8 @@ func WithSDK(config *sdktrace.Config) Option {
 	}
 }
 
-// RegisterAsGlobal enables the registration of the trace provider of the new pipeline
-// as Global Trace Provider.
-func RegisterAsGlobal() Option {
-	return func(o *options) {
-		o.RegisterGlobal = true
-	}
-}
-
+// WithDisabled option will cause pipeline methods to use
+// a no-op provider
 func WithDisabled(disabled bool) Option {
 	return func(o *options) {
 		o.Disabled = disabled
@@ -177,13 +167,22 @@ func NewExportPipeline(endpointOption EndpointOption, opts ...Option) (apitrace.
 	if exporter.o.Config != nil {
 		tp.ApplyConfig(*exporter.o.Config)
 	}
-	if exporter.o.RegisterGlobal {
-		global.SetTraceProvider(tp)
-	}
 
 	return tp, exporter.Flush, nil
 }
 
+// InstallNewPipeline instantiates a NewExportPipeline with the
+// recommended configuration and registers it globally.
+func InstallNewPipeline(endpointOption EndpointOption, opts ...Option) (func(), error) {
+	tp, flushFn, err := NewExportPipeline(endpointOption, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	global.SetTraceProvider(tp)
+	return flushFn, nil
+}
+
 // Process contains the information exported to jaeger about the source
 // of the trace data.
 type Process struct {

exporters/trace/jaeger/jaeger_test.go

@@ -26,10 +26,12 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"google.golang.org/api/support/bundler"
 	"google.golang.org/grpc/codes"
 
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/kv"
+	"go.opentelemetry.io/otel/api/trace"
 	apitrace "go.opentelemetry.io/otel/api/trace"
 	gen "go.opentelemetry.io/otel/exporters/trace/jaeger/internal/gen-go/jaeger"
 	ottest "go.opentelemetry.io/otel/internal/testing"
@@ -38,77 +40,251 @@ import (
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 
-func TestNewExporterPipelineWithRegistration(t *testing.T) {
-	tp, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-		RegisterAsGlobal(),
-	)
-	defer fn()
-	assert.NoError(t, err)
-	assert.Same(t, tp, global.TraceProvider())
+const (
+	collectorEndpoint = "http://localhost:14268/api/traces"
+	agentEndpoint     = "localhost:6831"
+)
+
+func TestInstallNewPipeline(t *testing.T) {
+	testCases := []struct {
+		name             string
+		endpoint         EndpointOption
+		options          []Option
+		expectedProvider trace.Provider
+	}{
+		{
+			name:             "simple pipeline",
+			endpoint:         WithCollectorEndpoint(collectorEndpoint),
+			expectedProvider: &sdktrace.Provider{},
+		},
+		{
+			name:             "with agent endpoint",
+			endpoint:         WithAgentEndpoint(agentEndpoint),
+			expectedProvider: &sdktrace.Provider{},
+		},
+		{
+			name:     "with disabled",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithDisabled(true),
+			},
+			expectedProvider: &apitrace.NoopProvider{},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			fn, err := InstallNewPipeline(
+				tc.endpoint,
+				tc.options...,
+			)
+			defer fn()
+
+			assert.NoError(t, err)
+			assert.IsType(t, tc.expectedProvider, global.TraceProvider())
+
+			global.SetTraceProvider(nil)
+		})
+	}
 }
 
-func TestNewExporterPipelineWithoutRegistration(t *testing.T) {
-	tp, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-	)
-	defer fn()
-	assert.NoError(t, err)
-	assert.NotEqual(t, tp, global.TraceProvider())
+func TestNewExportPipeline(t *testing.T) {
+	testCases := []struct {
+		name                                  string
+		endpoint                              EndpointOption
+		options                               []Option
+		expectedProviderType                  trace.Provider
+		testSpanSampling, spanShouldBeSampled bool
+	}{
+		{
+			name:                 "simple pipeline",
+			endpoint:             WithCollectorEndpoint(collectorEndpoint),
+			expectedProviderType: &sdktrace.Provider{},
+		},
+		{
+			name:     "with disabled",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithDisabled(true),
+			},
+			expectedProviderType: &apitrace.NoopProvider{},
+		},
+		{
+			name:     "always on",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithSDK(&sdktrace.Config{
+					DefaultSampler: sdktrace.AlwaysSample(),
+				}),
+			},
+			expectedProviderType: &sdktrace.Provider{},
+			testSpanSampling:     true,
+			spanShouldBeSampled:  true,
+		},
+		{
+			name:     "never",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithSDK(&sdktrace.Config{
+					DefaultSampler: sdktrace.NeverSample(),
+				}),
+			},
+			expectedProviderType: &sdktrace.Provider{},
+			testSpanSampling:     true,
+			spanShouldBeSampled:  false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			tp, fn, err := NewExportPipeline(
+				tc.endpoint,
+				tc.options...,
+			)
+			defer fn()
+
+			assert.NoError(t, err)
+			assert.NotEqual(t, tp, global.TraceProvider())
+			assert.IsType(t, tc.expectedProviderType, tp)
+
+			if tc.testSpanSampling {
+				_, span := tp.Tracer("jaeger test").Start(context.Background(), tc.name)
+				spanCtx := span.SpanContext()
+				assert.Equal(t, tc.spanShouldBeSampled, spanCtx.IsSampled())
+				span.End()
+			}
+		})
+	}
 }
 
-func TestNewExporterPipelineWithSDK(t *testing.T) {
-	tp, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-		WithSDK(&sdktrace.Config{
-			DefaultSampler: sdktrace.AlwaysSample(),
-		}),
-	)
-	defer fn()
-	assert.NoError(t, err)
-	_, span := tp.Tracer("jaeger test").Start(context.Background(), "always-on")
-	spanCtx := span.SpanContext()
-	assert.True(t, spanCtx.IsSampled())
-	span.End()
+func TestNewExportPipelineWithDisabledFromEnv(t *testing.T) {
+	envStore, err := ottest.SetEnvVariables(map[string]string{
+		envDisabled: "true",
+	})
+	require.NoError(t, err)
+	envStore.Record(envDisabled)
+	defer func() {
+		require.NoError(t, envStore.Restore())
+	}()
 
-	tp2, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-		WithSDK(&sdktrace.Config{
-			DefaultSampler: sdktrace.NeverSample(),
-		}),
+	tp, fn, err := NewExportPipeline(
+		WithCollectorEndpoint(collectorEndpoint),
 	)
 	defer fn()
 	assert.NoError(t, err)
-	_, span2 := tp2.Tracer("jaeger test").Start(context.Background(), "never")
-	span2Ctx := span2.SpanContext()
-	assert.False(t, span2Ctx.IsSampled())
-	span2.End()
+	assert.IsType(t, &apitrace.NoopProvider{}, tp)
 }
 
 func TestNewRawExporter(t *testing.T) {
-	const (
-		collectorEndpoint = "http://localhost"
-		serviceName       = "test-service"
-		tagKey            = "key"
-		tagVal            = "val"
-	)
-	// Create Jaeger Exporter
-	exp, err := NewRawExporter(
-		WithCollectorEndpoint(collectorEndpoint),
-		WithProcess(Process{
-			ServiceName: serviceName,
-			Tags: []kv.KeyValue{
-				kv.String(tagKey, tagVal),
+	testCases := []struct {
+		name                                                           string
+		endpoint                                                       EndpointOption
+		options                                                        []Option
+		expectedServiceName                                            string
+		expectedTagsLen, expectedBufferMaxCount, expectedBatchMaxCount int
+	}{
+		{
+			name:                   "default exporter",
+			endpoint:               WithCollectorEndpoint(collectorEndpoint),
+			expectedServiceName:    defaultServiceName,
+			expectedBufferMaxCount: bundler.DefaultBufferedByteLimit,
+			expectedBatchMaxCount:  bundler.DefaultBundleCountThreshold,
+		},
+		{
+			name:                   "default exporter with agent endpoint",
+			endpoint:               WithAgentEndpoint(agentEndpoint),
+			expectedServiceName:    defaultServiceName,
+			expectedBufferMaxCount: bundler.DefaultBufferedByteLimit,
+			expectedBatchMaxCount:  bundler.DefaultBundleCountThreshold,
+		},
+		{
+			name:     "with process",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithProcess(
+					Process{
+						ServiceName: "jaeger-test",
+						Tags: []kv.KeyValue{
+							kv.String("key", "val"),
+						},
+					},
+				),
 			},
-		}),
-	)
+			expectedServiceName:    "jaeger-test",
+			expectedTagsLen:        1,
+			expectedBufferMaxCount: bundler.DefaultBufferedByteLimit,
+			expectedBatchMaxCount:  bundler.DefaultBundleCountThreshold,
+		},
+		{
+			name:     "with buffer and batch max count",
+			endpoint: WithCollectorEndpoint(collectorEndpoint),
+			options: []Option{
+				WithProcess(
+					Process{
+						ServiceName: "jaeger-test",
+					},
+				),
+				WithBufferMaxCount(99),
+				WithBatchMaxCount(99),
+			},
+			expectedServiceName:    "jaeger-test",
+			expectedBufferMaxCount: 99,
+			expectedBatchMaxCount:  99,
+		},
+	}
 
-	assert.NoError(t, err)
-	assert.EqualValues(t, serviceName, exp.process.ServiceName)
-	assert.Len(t, exp.process.Tags, 1)
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			exp, err := NewRawExporter(
+				tc.endpoint,
+				tc.options...,
+			)
+
+			assert.NoError(t, err)
+			assert.Equal(t, tc.expectedServiceName, exp.process.ServiceName)
+			assert.Len(t, exp.process.Tags, tc.expectedTagsLen)
+			assert.Equal(t, tc.expectedBufferMaxCount, exp.bundler.BufferedByteLimit)
+			assert.Equal(t, tc.expectedBatchMaxCount, exp.bundler.BundleCountThreshold)
+		})
+	}
 }
 
-func TestNewRawExporterShouldFailIfCollectorEndpointEmpty(t *testing.T) {
+func TestNewRawExporterShouldFail(t *testing.T) {
+	testCases := []struct {
+		name           string
+		endpoint       EndpointOption
+		expectedErrMsg string
+	}{
+		{
+			name:           "with empty collector endpoint",
+			endpoint:       WithCollectorEndpoint(""),
+			expectedErrMsg: "collectorEndpoint must not be empty",
+		},
+		{
+			name:           "with empty agent endpoint",
+			endpoint:       WithAgentEndpoint(""),
+			expectedErrMsg: "agentEndpoint must not be empty",
+		},
+		{
+			name:           "with invalid agent endpoint",
+			endpoint:       WithAgentEndpoint("localhost"),
+			expectedErrMsg: "address localhost: missing port in address",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			_, err := NewRawExporter(
+				tc.endpoint,
+			)
+
+			assert.Error(t, err)
+			assert.EqualError(t, err, tc.expectedErrMsg)
+		})
+	}
+}
+
+func TestNewRawExporterShouldFailIfCollectorUnset(t *testing.T) {
 	// Record and restore env
 	envStore := ottest.NewEnvStore()
 	envStore.Record(envEndpoint)
@@ -179,29 +355,6 @@ func TestExporter_ExportSpan(t *testing.T) {
 	assert.True(t, len(tc.spansUploaded) == 1)
 }
 
-func TestNewRawExporterWithAgentEndpoint(t *testing.T) {
-	const agentEndpoint = "localhost:6831"
-	// Create Jaeger Exporter
-	_, err := NewRawExporter(
-		WithAgentEndpoint(agentEndpoint),
-	)
-	assert.NoError(t, err)
-}
-
-func TestNewRawExporterWithAgentShouldFailIfEndpointInvalid(t *testing.T) {
-	//empty
-	_, err := NewRawExporter(
-		WithAgentEndpoint(""),
-	)
-	assert.Error(t, err)
-
-	//invalid endpoint addr
-	_, err = NewRawExporter(
-		WithAgentEndpoint("http://localhost"),
-	)
-	assert.Error(t, err)
-}
-
 func Test_spanDataToThrift(t *testing.T) {
 	now := time.Now()
 	traceID, _ := apitrace.IDFromHex("0102030405060708090a0b0c0d0e0f10")
@@ -319,31 +472,3 @@ func Test_spanDataToThrift(t *testing.T) {
 		})
 	}
 }
-
-func TestNewExporterPipelineWithDisabled(t *testing.T) {
-	tp, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-		WithDisabled(true),
-	)
-	defer fn()
-	assert.NoError(t, err)
-	assert.IsType(t, &apitrace.NoopProvider{}, tp)
-}
-
-func TestNewExporterPipelineWithDisabledFromEnv(t *testing.T) {
-	envStore, err := ottest.SetEnvVariables(map[string]string{
-		envDisabled: "true",
-	})
-	require.NoError(t, err)
-	envStore.Record(envDisabled)
-	defer func() {
-		require.NoError(t, envStore.Restore())
-	}()
-
-	tp, fn, err := NewExportPipeline(
-		WithCollectorEndpoint("http://localhost:14268/api/traces"),
-	)
-	defer fn()
-	assert.NoError(t, err)
-	assert.IsType(t, &apitrace.NoopProvider{}, tp)
-}

exporters/trace/zipkin/doc.go

@@ -0,0 +1,16 @@
+// 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 zipkin contains an OpenTelemetry tracing exporter for Zipkin.
+package zipkin // import "go.opentelemetry.io/otel/exporters/trace/zipkin"

exporters/trace/zipkin/zipkin.go

@@ -18,13 +18,16 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"net/http"
 	"net/url"
 
+	"go.opentelemetry.io/otel/api/global"
 	export "go.opentelemetry.io/otel/sdk/export/trace"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 
 // Exporter exports SpanData to the zipkin collector. It implements
@@ -35,6 +38,7 @@ type Exporter struct {
 	serviceName string
 	client      *http.Client
 	logger      *log.Logger
+	o           options
 }
 
 var (
@@ -42,51 +46,97 @@ var (
 )
 
 // Options contains configuration for the exporter.
-type Options struct {
+type options struct {
 	client *http.Client
 	logger *log.Logger
+	config *sdktrace.Config
 }
 
 // Option defines a function that configures the exporter.
-type Option func(*Options)
+type Option func(*options)
 
 // WithLogger configures the exporter to use the passed logger.
 func WithLogger(logger *log.Logger) Option {
-	return func(opts *Options) {
+	return func(opts *options) {
 		opts.logger = logger
 	}
 }
 
 // WithClient configures the exporter to use the passed HTTP client.
 func WithClient(client *http.Client) Option {
-	return func(opts *Options) {
+	return func(opts *options) {
 		opts.client = client
 	}
 }
 
-// NewExporter creates a new zipkin exporter.
-func NewExporter(collectorURL string, serviceName string, os ...Option) (*Exporter, error) {
-	if _, err := url.Parse(collectorURL); err != nil {
+// WithSDK sets the SDK config for the exporter pipeline.
+func WithSDK(config *sdktrace.Config) Option {
+	return func(o *options) {
+		o.config = config
+	}
+}
+
+// NewRawExporter creates a new Zipkin exporter.
+func NewRawExporter(collectorURL, serviceName string, opts ...Option) (*Exporter, error) {
+	if collectorURL == "" {
+		return nil, errors.New("collector URL cannot be empty")
+	}
+	u, err := url.Parse(collectorURL)
+	if err != nil {
 		return nil, fmt.Errorf("invalid collector URL: %v", err)
 	}
-	if serviceName == "" {
-		return nil, fmt.Errorf("service name must be non-empty string")
+	if u.Scheme == "" || u.Host == "" {
+		return nil, errors.New("invalid collector URL")
 	}
-	opts := Options{}
-	for _, o := range os {
-		o(&opts)
+
+	o := options{}
+	for _, opt := range opts {
+		opt(&o)
 	}
-	if opts.client == nil {
-		opts.client = http.DefaultClient
+	if o.client == nil {
+		o.client = http.DefaultClient
 	}
 	return &Exporter{
 		url:         collectorURL,
-		client:      opts.client,
-		logger:      opts.logger,
+		client:      o.client,
+		logger:      o.logger,
 		serviceName: serviceName,
+		o:           o,
 	}, nil
 }
 
+// NewExportPipeline sets up a complete export pipeline
+// with the recommended setup for trace provider
+func NewExportPipeline(collectorURL, serviceName string, opts ...Option) (*sdktrace.Provider, error) {
+	exp, err := NewRawExporter(collectorURL, serviceName, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	batcher := sdktrace.WithBatcher(exp)
+	tp, err := sdktrace.NewProvider(batcher)
+	if err != nil {
+		return nil, err
+	}
+	if exp.o.config != nil {
+		tp.ApplyConfig(*exp.o.config)
+	}
+
+	return tp, err
+}
+
+// InstallNewPipeline instantiates a NewExportPipeline with the
+// recommended configuration and registers it globally.
+func InstallNewPipeline(collectorURL, serviceName string, opts ...Option) error {
+	tp, err := NewExportPipeline(collectorURL, serviceName, opts...)
+	if err != nil {
+		return err
+	}
+
+	global.SetTraceProvider(tp)
+	return nil
+}
+
 // ExportSpans is a part of an implementation of the SpanBatcher
 // interface.
 func (e *Exporter) ExportSpans(ctx context.Context, batch []*export.SpanData) {

exporters/trace/zipkin/zipkin_test.go

@@ -27,13 +27,118 @@ import (
 	"time"
 
 	zkmodel "github.com/openzipkin/zipkin-go/model"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc/codes"
 
+	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/trace"
 	export "go.opentelemetry.io/otel/sdk/export/trace"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 
+const (
+	collectorURL = "http://localhost:9411/api/v2/spans"
+	serviceName  = "zipkin-test"
+)
+
+func TestInstallNewPipeline(t *testing.T) {
+	err := InstallNewPipeline(
+		collectorURL,
+		serviceName,
+	)
+	assert.NoError(t, err)
+	assert.IsType(t, &sdktrace.Provider{}, global.TraceProvider())
+}
+
+func TestNewExportPipeline(t *testing.T) {
+	testCases := []struct {
+		name                                  string
+		options                               []Option
+		testSpanSampling, spanShouldBeSampled bool
+	}{
+		{
+			name: "simple pipeline",
+		},
+		{
+			name: "always on",
+			options: []Option{
+				WithSDK(&sdktrace.Config{
+					DefaultSampler: sdktrace.AlwaysSample(),
+				}),
+			},
+			testSpanSampling:    true,
+			spanShouldBeSampled: true,
+		},
+		{
+			name: "never",
+			options: []Option{
+				WithSDK(&sdktrace.Config{
+					DefaultSampler: sdktrace.NeverSample(),
+				}),
+			},
+			testSpanSampling:    true,
+			spanShouldBeSampled: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			tp, err := NewExportPipeline(
+				collectorURL,
+				serviceName,
+				tc.options...,
+			)
+			assert.NoError(t, err)
+			assert.NotEqual(t, tp, global.TraceProvider())
+
+			if tc.testSpanSampling {
+				_, span := tp.Tracer("zipkin test").Start(context.Background(), tc.name)
+				spanCtx := span.SpanContext()
+				assert.Equal(t, tc.spanShouldBeSampled, spanCtx.IsSampled())
+				span.End()
+			}
+		})
+	}
+}
+
+func TestNewRawExporter(t *testing.T) {
+	exp, err := NewRawExporter(
+		collectorURL,
+		serviceName,
+	)
+
+	assert.NoError(t, err)
+	assert.EqualValues(t, serviceName, exp.serviceName)
+}
+
+func TestNewRawExporterShouldFailInvalidCollectorURL(t *testing.T) {
+	var (
+		exp *Exporter
+		err error
+	)
+
+	// cannot be empty
+	exp, err = NewRawExporter(
+		"",
+		serviceName,
+	)
+
+	assert.Error(t, err)
+	assert.EqualError(t, err, "collector URL cannot be empty")
+	assert.Nil(t, exp)
+
+	// invalid URL
+	exp, err = NewRawExporter(
+		"localhost",
+		serviceName,
+	)
+
+	assert.Error(t, err)
+	assert.EqualError(t, err, "invalid collector URL")
+	assert.Nil(t, exp)
+}
+
 type mockZipkinCollector struct {
 	t       *testing.T
 	url     string
@@ -230,9 +335,7 @@ func TestExportSpans(t *testing.T) {
 	defer collector.Close()
 	ls := &logStore{T: t}
 	logger := logStoreLogger(ls)
-	_, err := NewExporter(collector.url, "", WithLogger(logger))
-	require.Error(t, err, "service name must be non-empty string")
-	exporter, err := NewExporter(collector.url, "exporter-test", WithLogger(logger))
+	exporter, err := NewRawExporter(collector.url, "exporter-test", WithLogger(logger))
 	require.NoError(t, err)
 	ctx := context.Background()
 	require.Len(t, ls.Messages, 0)

internal/testing/env.go

@@ -29,7 +29,7 @@ type EnvStore interface {
 	// Records the environment variable into the store.
 	Record(key string)
 
-	// Restore recover the environment variables in the store.
+	// Restore recovers the environment variables in the store.
 	Restore() error
 }