go.opentelemetry.io/otel/trace v1.42.0: noop.NewTracerProvider

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 go.opentelemetry.io/otel/trace/noop.NewTracerProvider in pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/trace/noop.NewTracerProvider

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:sha256:7b873ba586da6a39bcc74b7dcb5445721ed4621213aab12131b07fd04dab2cfc","contract":["noop.NewTracerProvider returns a non-nil TracerProvider implementing the trace.TracerProvider interface","noop.TracerProvider.Tracer returns a functional non-nil Tracer instance","noop.Tracer creates spans without error","noop span operations execute safely without panic or side effects","noop.NewTracerProvider integrates with sample TracerManager helper"],"goal":"verify go.opentelemetry.io/otel/trace/noop.NewTracerProvider in pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/trace/noop.NewTracerProvider"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0","symbols":["go.opentelemetry.io/otel/trace/noop.NewTracerProvider"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require go.opentelemetry.io/otel/trace v1.42.0

require (
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	go.opentelemetry.io/otel v1.42.0 // 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/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/otel v1.42.0 h1:lSQGzTgVR3+sgJDAU/7/ZMjN9Z+vUip7leaqBKy4sho=
go.opentelemetry.io/otel v1.42.0/go.mod h1:lJNsdRMxCUIWuMlVJWzecSMuNjE7dOYyWlqOXWkdqCc=
go.opentelemetry.io/otel/trace v1.42.0 h1:OUCgIPt+mzOnaUTpOQcBiM/PLQ/Op7oq6g4LenLmOYY=
go.opentelemetry.io/otel/trace v1.42.0/go.mod h1:f3K9S+IFqnumBkKhRJMeaZeNk9epyhnCmQh/EysQCdc=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package sample

import (
	"context"

	"go.opentelemetry.io/otel/trace"
	"go.opentelemetry.io/otel/trace/noop"
)

// TracerManager manages tracing operations using a TracerProvider.
type TracerManager struct {
	provider trace.TracerProvider
	tracer   trace.Tracer
}

// NewTracerManager creates a TracerManager. If tp is nil, it defaults to noop.NewTracerProvider().
func NewTracerManager(tp trace.TracerProvider) (*TracerManager, error) {
	if tp == nil {
		tp = noop.NewTracerProvider()
	}

	tracer := tp.Tracer("example.com/noop-tracer")

	return &TracerManager{
		provider: tp,
		tracer:   tracer,
	}, nil
}

// StartSpan creates and starts a span using the underlying tracer.
func (m *TracerManager) StartSpan(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
	return m.tracer.Start(ctx, name, opts...)
}

// TracerProvider returns the underlying TracerProvider.
func (m *TracerManager) TracerProvider() trace.TracerProvider {
	return m.provider
}

// Tracer returns the underlying Tracer.
func (m *TracerManager) Tracer() trace.Tracer {
	return m.tracer
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/trace/noop.NewTracerProvider in pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/trace@v1.42.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/trace/noop.NewTracerProvider"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"go.opentelemetry.io/otel/trace"
	"go.opentelemetry.io/otel/trace/noop"
	"sample"
)

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

	// 1. noop.NewTracerProvider returns a non-nil trace.TracerProvider implementing the OpenTelemetry interface
	tp := noop.NewTracerProvider()
	var iface trace.TracerProvider = tp
	if iface == nil {
		fmt.Fprintf(os.Stderr, "noop.NewTracerProvider returned nil interface\n")
		os.Exit(1)
	}

	// 2. TracerProvider produces functional Tracer instances with specified options
	tr := tp.Tracer("test-tracer", trace.WithInstrumentationVersion("1.0.0"))
	if tr == nil {
		fmt.Fprintf(os.Stderr, "Tracer() returned nil\n")
		os.Exit(1)
	}

	// 3. Tracer creates spans without error
	ctx, span := tr.Start(ctx, "test-span")
	if span == nil {
		fmt.Fprintf(os.Stderr, "Start() returned nil span\n")
		os.Exit(1)
	}

	// 4. Noop span methods execute safely without panic or side effects
	span.AddEvent("test-event")
	span.RecordError(fmt.Errorf("test error"))
	if span.IsRecording() {
		fmt.Fprintf(os.Stderr, "noop span should not be recording\n")
		os.Exit(1)
	}
	span.End()

	// 5. Integrates with sample package helper
	mgr, err := sample.NewTracerManager(nil)
	if err != nil {
		fmt.Fprintf(os.Stderr, "NewTracerManager failed: %v\n", err)
		os.Exit(1)
	}
	_, s := mgr.StartSpan(ctx, "sample-span")
	if s == nil {
		fmt.Fprintf(os.Stderr, "mgr.StartSpan returned nil span\n")
		os.Exit(1)
	}
	s.End()

	fmt.Println("All noop.NewTracerProvider contract assertions passed.")
}