go.opentelemetry.io/otel/sdk v1.43.0: NewTracerProvider, WithSyncer, WithSampler

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:32e9de7f287cf5bdb38ac03651de254e7dd99aedc36b2221400d666e130e5e44","contract":["sdktrace.NewTracerProvider creates a configured TracerProvider with span processors and samplers","sdktrace.WithSyncer registers a span exporter using a SimpleSpanProcessor to export spans synchronously","sdktrace.WithSampler configures sampling behavior for generated spans","sdktrace.WithResource attaches resource attributes to all spans produced by the TracerProvider","tracetest.NewInMemoryExporter records spans in memory for inspection and testing"],"goal":"verify pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0"],"schemaVersion":1,"symbols":["NewTracerProvider","WithSyncer","WithSampler","WithResource","NewInMemoryExporter"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0"],"schemaVersion":1,"symbols":["NewTracerProvider","WithSyncer","WithSampler","WithResource","NewInMemoryExporter"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require (
	go.opentelemetry.io/otel v1.43.0
	go.opentelemetry.io/otel/sdk v1.43.0
	go.opentelemetry.io/otel/trace v1.43.0
)

require (
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/go-logr/logr v1.4.3 // indirect
	github.com/go-logr/stdr v1.2.2 // indirect
	github.com/google/uuid v1.6.0 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel/metric v1.43.0 // indirect
	golang.org/x/sys v0.42.0 // indirect
)

github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/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 v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
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/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
go.opentelemetry.io/otel v1.43.0 h1:mYIM03dnh5zfN7HautFE4ieIig9amkNANT+xcVxAj9I=
go.opentelemetry.io/otel v1.43.0/go.mod h1:JuG+u74mvjvcm8vj8pI5XiHy1zDeoCS2LB1spIq7Ay0=
go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
go.opentelemetry.io/otel/metric v1.43.0/go.mod h1:RDnPtIxvqlgO8GRW18W6Z/4P462ldprJtfxHxyKd2PY=
go.opentelemetry.io/otel/sdk v1.43.0 h1:pi5mE86i5rTeLXqoF/hhiBtUNcrAGHLKQdhg4h4V9Dg=
go.opentelemetry.io/otel/sdk v1.43.0/go.mod h1:P+IkVU3iWukmiit/Yf9AWvpyRDlUeBaRg6Y+C58QHzg=
go.opentelemetry.io/otel/sdk/metric v1.43.0 h1:S88dyqXjJkuBNLeMcVPRFXpRw2fuwdvfCGLEo89fDkw=
go.opentelemetry.io/otel/sdk/metric v1.43.0/go.mod h1:C/RJtwSEJ5hzTiUz5pXF1kILHStzb9zFlIEe85bhj6A=
go.opentelemetry.io/otel/trace v1.43.0 h1:BkNrHpup+4k4w+ZZ86CZoHHEkohws8AY+WTX09nk+3A=
go.opentelemetry.io/otel/trace v1.43.0/go.mod h1:/QJhyVBUUswCphDVxq+8mld+AvhXZLhe+8WVFxiFff0=
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"context"
	"fmt"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	"go.opentelemetry.io/otel/sdk/trace/tracetest"
	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
	"go.opentelemetry.io/otel/trace"
)

// TelemetryPipeline manages an OpenTelemetry trace pipeline.
type TelemetryPipeline struct {
	exporter *tracetest.InMemoryExporter
	provider *sdktrace.TracerProvider
}

// NewTelemetryPipeline configures an OpenTelemetry SDK tracer provider with in-memory exporting.
func NewTelemetryPipeline(serviceName string) (*TelemetryPipeline, error) {
	exporter := tracetest.NewInMemoryExporter()

	res, err := resource.Merge(
		resource.Default(),
		resource.NewSchemaless(
			semconv.ServiceNameKey.String(serviceName),
			attribute.String("environment", "demonstration"),
		),
	)
	if err != nil {
		return nil, fmt.Errorf("failed to create resource: %w", err)
	}

	provider := sdktrace.NewTracerProvider(
		sdktrace.WithSyncer(exporter),
		sdktrace.WithSampler(sdktrace.AlwaysSample()),
		sdktrace.WithResource(res),
	)

	return &TelemetryPipeline{
		exporter: exporter,
		provider: provider,
	}, nil
}

// ExecuteTask runs an operation instrumented with an OpenTelemetry trace span.
func (p *TelemetryPipeline) ExecuteTask(ctx context.Context, taskName string) error {
	tracer := p.provider.Tracer("example.com/task-runner")
	ctx, span := tracer.Start(ctx, taskName, trace.WithSpanKind(trace.SpanKindInternal))
	defer span.End()

	span.SetAttributes(
		attribute.String("task.status", "executing"),
		attribute.Int("task.items_count", 3),
	)

	span.AddEvent("task_step_completed", trace.WithAttributes(
		attribute.String("step.name", "initialization"),
	))

	return nil
}

// Spans returns recorded span snapshots from the in-memory exporter.
func (p *TelemetryPipeline) Spans() tracetest.SpanStubs {
	return p.exporter.GetSpans()
}

// Shutdown flushes and terminates the pipeline.
func (p *TelemetryPipeline) Shutdown(ctx context.Context) error {
	return p.provider.Shutdown(ctx)
}

func main() {
	ctx := context.Background()
	pipeline, err := NewTelemetryPipeline("example-service")
	if err != nil {
		fmt.Printf("Initialization error: %v\n", err)
		return
	}
	defer func() {
		if err := pipeline.Shutdown(ctx); err != nil {
			fmt.Printf("Shutdown error: %v\n", err)
		}
	}()

	if err := pipeline.ExecuteTask(ctx, "process-records"); err != nil {
		fmt.Printf("Execution error: %v\n", err)
		return
	}

	spans := pipeline.Spans()
	fmt.Printf("Successfully recorded %d span(s)\n", len(spans))
	for _, span := range spans {
		fmt.Printf("Span Name: %s, TraceID: %s, Attributes: %d\n",
			span.Name, span.SpanContext.TraceID().String(), len(span.Attributes))
	}
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"context"
	"fmt"
	"os"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	"go.opentelemetry.io/otel/sdk/trace/tracetest"
	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
	"go.opentelemetry.io/otel/trace"
)

func main() {
	ctx := context.Background()

	// Contract 1: tracetest.NewInMemoryExporter records spans in memory for inspection and testing
	var exporter *tracetest.InMemoryExporter
	{
		exporter = tracetest.NewInMemoryExporter()
		if exporter == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil InMemoryExporter from tracetest.NewInMemoryExporter()")
			os.Exit(1)
		}
		if len(exporter.GetSpans()) != 0 {
			fmt.Fprintf(os.Stderr, "FAIL: expected initial spans count 0, got %d\n", len(exporter.GetSpans()))
			os.Exit(1)
		}
	}

	// Contract 2: sdktrace.WithResource attaches resource attributes to all spans produced by the TracerProvider
	var res *resource.Resource
	{
		var err error
		res, err = resource.Merge(
			resource.Default(),
			resource.NewSchemaless(
				semconv.ServiceNameKey.String("contract-test-service"),
				attribute.String("custom.environment", "test"),
			),
		)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: resource.Merge returned unexpected error: %v\n", err)
			os.Exit(1)
		}
		if res == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Resource")
			os.Exit(1)
		}
	}

	// Contract 3: sdktrace.NewTracerProvider creates a configured TracerProvider with span processors and samplers
	// Contract 4: sdktrace.WithSyncer registers a span exporter using a SimpleSpanProcessor to export spans synchronously
	// Contract 5: sdktrace.WithSampler configures sampling behavior for generated spans
	var tp *sdktrace.TracerProvider
	{
		tp = sdktrace.NewTracerProvider(
			sdktrace.WithSyncer(exporter),
			sdktrace.WithSampler(sdktrace.AlwaysSample()),
			sdktrace.WithResource(res),
		)
		if tp == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil TracerProvider from sdktrace.NewTracerProvider()")
			os.Exit(1)
		}
	}

	// Execute span lifecycle and verify all contracts end-to-end
	{
		tracer := tp.Tracer("contract-tracer")
		if tracer == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Tracer from tp.Tracer()")
			os.Exit(1)
		}

		spanCtx, span := tracer.Start(ctx, "contract-span-operation",
			trace.WithAttributes(attribute.String("op.key", "op.value")),
		)
		if span == nil || spanCtx == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected valid span and context from tracer.Start()")
			os.Exit(1)
		}

		if !span.IsRecording() {
			fmt.Fprintln(os.Stderr, "FAIL: expected span to be recording with AlwaysSample()")
			os.Exit(1)
		}

		span.AddEvent("contract-event", trace.WithAttributes(attribute.Int("event.code", 200)))
		span.End()

		// Verify syncer exported the span immediately
		spans := exporter.GetSpans()
		if len(spans) != 1 {
			fmt.Fprintf(os.Stderr, "FAIL: expected 1 exported span, got %d\n", len(spans))
			os.Exit(1)
		}

		exportedSpan := spans[0]
		if exportedSpan.Name != "contract-span-operation" {
			fmt.Fprintf(os.Stderr, "FAIL: expected span name 'contract-span-operation', got '%s'\n", exportedSpan.Name)
			os.Exit(1)
		}

		// Verify resource attributes on the exported span
		var foundServiceName bool
		for _, attr := range exportedSpan.Resource.Attributes() {
			if attr.Key == semconv.ServiceNameKey && attr.Value.AsString() == "contract-test-service" {
				foundServiceName = true
				break
			}
		}
		if !foundServiceName {
			fmt.Fprintln(os.Stderr, "FAIL: expected resource attribute service.name='contract-test-service' on exported span")
			os.Exit(1)
		}

		// Verify events
		if len(exportedSpan.Events) != 1 || exportedSpan.Events[0].Name != "contract-event" {
			fmt.Fprintf(os.Stderr, "FAIL: expected 1 event named 'contract-event', got %v\n", exportedSpan.Events)
			os.Exit(1)
		}
	}

	// Verify NeverSample behavior with WithSampler
	{
		neverExporter := tracetest.NewInMemoryExporter()
		neverTP := sdktrace.NewTracerProvider(
			sdktrace.WithSyncer(neverExporter),
			sdktrace.WithSampler(sdktrace.NeverSample()),
		)

		neverTracer := neverTP.Tracer("never-sampler-tracer")
		_, nonSampledSpan := neverTracer.Start(ctx, "unsampled-span")
		if nonSampledSpan.SpanContext().IsSampled() {
			fmt.Fprintln(os.Stderr, "FAIL: expected span to not be sampled under NeverSample()")
			os.Exit(1)
		}
		nonSampledSpan.End()

		if len(neverExporter.GetSpans()) != 0 {
			fmt.Fprintf(os.Stderr, "FAIL: expected 0 spans exported under NeverSample(), got %d\n", len(neverExporter.GetSpans()))
			os.Exit(1)
		}

		if err := neverTP.Shutdown(ctx); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: neverTP.Shutdown failed: %v\n", err)
			os.Exit(1)
		}
	}

	// Shutdown pipeline
	if err := tp.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: tp.Shutdown failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: pkg:golang/go.opentelemetry.io/otel/sdk@v1.43.0 contract verified")
}