go.opentelemetry.io/otel v1.43.0: SetTracerProvider, GetTracerProvider, Tracer

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@v1.43.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel@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:sha256:1757fd8a443b8796a8b842abdde65600e450ce6b7baca890e1a6dbeba4a4a25e","contract":["otel.SetTracerProvider registers a global TracerProvider and otel.GetTracerProvider returns it","otel.Tracer creates a named Tracer delegating to the configured global TracerProvider","otel.SetMeterProvider registers a global MeterProvider and otel.GetMeterProvider returns it","otel.SetErrorHandler registers a global ErrorHandler and otel.Handle delegates errors to it","otel.SetTextMapPropagator registers a global TextMapPropagator and otel.GetTextMapPropagator returns it"],"goal":"verify pkg:golang/go.opentelemetry.io/otel@v1.43.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel@v1.43.0"],"schemaVersion":1,"symbols":["SetTracerProvider","GetTracerProvider","Tracer","SetMeterProvider","GetMeterProvider","SetErrorHandler","Handle","SetTextMapPropagator","GetTextMapPropagator"]},"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@v1.43.0"],"schemaVersion":1,"symbols":["SetTracerProvider","GetTracerProvider","Tracer","SetMeterProvider","GetMeterProvider","SetErrorHandler","Handle","SetTextMapPropagator","GetTextMapPropagator"],"verifierAdapter":"golang@1"}

module example.com/otelsample

go 1.26.6

require (
	go.opentelemetry.io/otel v1.43.0
	go.opentelemetry.io/otel/metric 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
	go.opentelemetry.io/auto/sdk v1.2.1 // 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/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/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=
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"
	"errors"
	"fmt"
	"sync/atomic"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/metric/noop"
	"go.opentelemetry.io/otel/propagation"
	traceNoop "go.opentelemetry.io/otel/trace/noop"
)

// TelemetryApp demonstrates standard OpenTelemetry API setup and usage.
type TelemetryApp struct {
	appName string
}

// NewTelemetryApp initializes telemetry providers and sets up global handlers.
func NewTelemetryApp(name string) *TelemetryApp {
	// Register global tracer provider
	tp := traceNoop.NewTracerProvider()
	otel.SetTracerProvider(tp)

	// Register global meter provider
	mp := noop.NewMeterProvider()
	otel.SetMeterProvider(mp)

	// Register global propagator
	otel.SetTextMapPropagator(propagation.TraceContext{})

	return &TelemetryApp{appName: name}
}

// ProcessRequest executes an instrumented unit of work.
func (a *TelemetryApp) ProcessRequest(ctx context.Context, requestName string) error {
	tracer := otel.Tracer(a.appName)
	ctx, span := tracer.Start(ctx, requestName)
	defer span.End()

	meter := otel.Meter(a.appName)
	counter, err := meter.Int64Counter("requests_processed")
	if err != nil {
		otel.Handle(err)
		return err
	}
	counter.Add(ctx, 1)

	span.AddEvent("processing completed")
	return nil
}

func main() {
	var errorCount int64
	otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {
		atomic.AddInt64(&errorCount, 1)
		fmt.Printf("Custom error handler captured: %v\n", err)
	}))

	app := NewTelemetryApp("example.com/telemetry-service")
	ctx := context.Background()

	if err := app.ProcessRequest(ctx, "GetUserData"); err != nil {
		fmt.Printf("Request error: %v\n", err)
	}

	otel.Handle(errors.New("simulated telemetry reporting error"))
	fmt.Printf("Telemetry application finished, handled errors: %d\n", atomic.LoadInt64(&errorCount))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel@v1.43.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel@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"
	"errors"
	"fmt"
	"os"
	"sync/atomic"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/metric/noop"
	"go.opentelemetry.io/otel/propagation"
	traceNoop "go.opentelemetry.io/otel/trace/noop"
)

func main() {
	// Contract 1: otel.SetTracerProvider registers a global TracerProvider and otel.GetTracerProvider returns it
	{
		tp := traceNoop.NewTracerProvider()
		otel.SetTracerProvider(tp)
		gotTP := otel.GetTracerProvider()
		if gotTP == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil TracerProvider from otel.GetTracerProvider()")
			os.Exit(1)
		}
	}

	// Contract 2: otel.Tracer creates a named Tracer delegating to the configured global TracerProvider
	{
		tracer := otel.Tracer("contract-tracer")
		if tracer == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Tracer from otel.Tracer()")
			os.Exit(1)
		}

		ctx := context.Background()
		ctxWithSpan, span := tracer.Start(ctx, "contract-span")
		if span == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Span from tracer.Start()")
			os.Exit(1)
		}
		if ctxWithSpan == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Context from tracer.Start()")
			os.Exit(1)
		}
		span.AddEvent("contract-event")
		span.End()
	}

	// Contract 3: otel.SetMeterProvider registers a global MeterProvider and otel.GetMeterProvider returns it
	{
		mp := noop.NewMeterProvider()
		otel.SetMeterProvider(mp)
		gotMP := otel.GetMeterProvider()
		if gotMP == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil MeterProvider from otel.GetMeterProvider()")
			os.Exit(1)
		}

		meter := otel.Meter("contract-meter")
		if meter == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Meter from otel.Meter()")
			os.Exit(1)
		}

		counter, err := meter.Int64Counter("contract-counter")
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: unexpected error creating counter: %v\n", err)
			os.Exit(1)
		}
		counter.Add(context.Background(), 5)
	}

	// Contract 4: otel.SetErrorHandler registers a global ErrorHandler and otel.Handle delegates errors to it
	{
		var capturedErr error
		var handleCount int64
		handler := otel.ErrorHandlerFunc(func(err error) {
			atomic.AddInt64(&handleCount, 1)
			capturedErr = err
		})

		otel.SetErrorHandler(handler)
		gotHandler := otel.GetErrorHandler()
		if gotHandler == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil ErrorHandler from otel.GetErrorHandler()")
			os.Exit(1)
		}

		testErr := errors.New("contract test error")
		otel.Handle(testErr)

		if atomic.LoadInt64(&handleCount) != 1 {
			fmt.Fprintf(os.Stderr, "FAIL: expected ErrorHandler to be called once, got %d\n", atomic.LoadInt64(&handleCount))
			os.Exit(1)
		}
		if capturedErr == nil || capturedErr.Error() != "contract test error" {
			fmt.Fprintf(os.Stderr, "FAIL: expected captured error 'contract test error', got %v\n", capturedErr)
			os.Exit(1)
		}
	}

	// Contract 5: otel.SetTextMapPropagator registers a global TextMapPropagator and otel.GetTextMapPropagator returns it
	{
		propagator := propagation.TraceContext{}
		otel.SetTextMapPropagator(propagator)
		gotPropagator := otel.GetTextMapPropagator()
		if gotPropagator == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil TextMapPropagator from otel.GetTextMapPropagator()")
			os.Exit(1)
		}

		carrier := propagation.MapCarrier{}
		propagator.Inject(context.Background(), carrier)
		extractedCtx := propagator.Extract(context.Background(), carrier)
		if extractedCtx == nil {
			fmt.Fprintln(os.Stderr, "FAIL: expected non-nil Context from propagator.Extract()")
			os.Exit(1)
		}
	}

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