go.opentelemetry.io/otel v1.42.0

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@v1.42.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel@v1.42.0

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:a1712b91040465822dd8e8acbb7a463dc0b2f11ea3127bc9046e0648a51f0548","contract":["otel.Version returns the expected release version string 1.42.0.","otel.GetTracerProvider returns a non-nil global TracerProvider by default.","otel.Tracer returns a non-nil named Tracer from the global TracerProvider.","otel.GetMeterProvider returns a non-nil global MeterProvider by default.","otel.Meter returns a non-nil named Meter from the global MeterProvider.","otel.SetErrorHandler registers a custom ErrorHandler that receives errors passed to otel.Handle."],"goal":"verify pkg:golang/go.opentelemetry.io/otel@v1.42.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel@v1.42.0"],"schemaVersion":1},"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@v1.42.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel@v1.42.0","verifierAdapter":"golang@1"}

module sample

go 1.25.0

require go.opentelemetry.io/otel v1.42.0

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
	go.opentelemetry.io/otel/metric v1.42.0 // indirect
	go.opentelemetry.io/otel/trace 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/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 v1.42.0 h1:lSQGzTgVR3+sgJDAU/7/ZMjN9Z+vUip7leaqBKy4sho=
go.opentelemetry.io/otel v1.42.0/go.mod h1:lJNsdRMxCUIWuMlVJWzecSMuNjE7dOYyWlqOXWkdqCc=
go.opentelemetry.io/otel/metric v1.42.0 h1:2jXG+3oZLNXEPfNmnpxKDeZsFI5o4J+nz6xUlaFdF/4=
go.opentelemetry.io/otel/metric v1.42.0/go.mod h1:RlUN/7vTU7Ao/diDkEpQpnz3/92J9ko05BIwxYa2SSI=
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 main

import (
	"context"
	"errors"
	"fmt"

	"go.opentelemetry.io/otel"
)

func main() {
	fmt.Printf("OpenTelemetry version: %s\n", otel.Version())

	// Access global tracer provider and create a span
	tracer := otel.Tracer("example-service")
	ctx, span := tracer.Start(context.Background(), "main-operation")
	defer span.End()

	// Access global meter provider and create a counter
	meter := otel.Meter("example-service")
	counter, err := meter.Int64Counter("operations_total")
	if err == nil {
		counter.Add(ctx, 1)
	}

	// Exercise error handler
	var handledErr error
	otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {
		handledErr = err
	}))
	otel.Handle(errors.New("sample error"))
	if handledErr != nil {
		fmt.Printf("Handled error: %v\n", handledErr)
	}
}

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

package main

import (
	"context"
	"errors"
	"fmt"
	"os"

	"go.opentelemetry.io/otel"
)

func main() {
	// Assertion 1: otel.Version returns the expected release version string "1.42.0".
	if v := otel.Version(); v != "1.42.0" {
		fmt.Fprintf(os.Stderr, "FAIL: expected otel.Version() == '1.42.0', got '%s'\n", v)
		os.Exit(1)
	}

	// Assertion 2: otel.GetTracerProvider returns a non-nil global TracerProvider by default.
	tp := otel.GetTracerProvider()
	if tp == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil TracerProvider from otel.GetTracerProvider()\n")
		os.Exit(1)
	}

	// Assertion 3: otel.Tracer returns a non-nil named Tracer from the global TracerProvider.
	tracer := otel.Tracer("contract-tracer")
	if tracer == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil Tracer from otel.Tracer()\n")
		os.Exit(1)
	}
	ctx, span := tracer.Start(context.Background(), "contract-span")
	if span == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil Span from tracer.Start()\n")
		os.Exit(1)
	}
	span.End()

	// Assertion 4: otel.GetMeterProvider returns a non-nil global MeterProvider by default.
	mp := otel.GetMeterProvider()
	if mp == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil MeterProvider from otel.GetMeterProvider()\n")
		os.Exit(1)
	}

	// Assertion 5: otel.Meter returns a non-nil named Meter from the global MeterProvider.
	meter := otel.Meter("contract-meter")
	if meter == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-nil Meter from otel.Meter()\n")
		os.Exit(1)
	}
	counter, err := meter.Int64Counter("contract-counter")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unexpected error creating Int64Counter: %v\n", err)
		os.Exit(1)
	}
	counter.Add(ctx, 1)

	// Assertion 6: otel.SetErrorHandler registers a custom ErrorHandler that receives errors passed to otel.Handle.
	var handledErr error
	otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {
		handledErr = err
	}))
	sentErr := errors.New("contract test error")
	otel.Handle(sentErr)
	if handledErr != sentErr {
		fmt.Fprintf(os.Stderr, "FAIL: expected handledErr == sentErr, got %v\n", handledErr)
		os.Exit(1)
	}

	fmt.Println("PASS: all otel contract assertions passed.")
}