go.opentelemetry.io/otel/log v1.47.0

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/log@v1.47.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/log@v1.47.0

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:d1d1eee1ddbd146cf96c3452cb5627dc9f4334a0bd14b82b0c004cfe641f287f","contract":["Record constructs with timestamp, observed timestamp, severity, severity text, event name, and body","Record adds and extracts typed KeyValue attributes for string, int, bool, and float","Record supports attribute inspection via WalkAttributes and AttributesLen","Record Clone creates an independent copy preserving attributes and severity","LoggerProvider creates a Logger that emits log records and evaluates Enabled"],"goal":"verify pkg:golang/go.opentelemetry.io/otel/log@v1.47.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/log@v1.47.0"],"schemaVersion":1},"contractCommand":["go","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/log@v1.47.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/log@v1.47.0","verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	go.opentelemetry.io/otel v1.47.0
	go.opentelemetry.io/otel/log v1.47.0
)

require github.com/cespare/xxhash/v2 v2.3.0 // 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/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
go.opentelemetry.io/otel v1.47.0 h1:j7ALJ/zgkS7Z6aeJW09p8VC9804bC+PpeTfCD4XPnOM=
go.opentelemetry.io/otel v1.47.0/go.mod h1:8wS9O2qfXrYrzp6hIF/HOYJJf/wIhFPhR2xLuP+iXQU=
go.opentelemetry.io/otel/log v1.47.0 h1:cOTS1CcLbSQeZKanGJ+0JpF/+t4PELi3O3bbl2lqCcI=
go.opentelemetry.io/otel/log v1.47.0/go.mod h1:9byitSQ5pLC6PpqwGXjqdMKya6ZTswHRZh2vvXT33nw=
go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=

package sample

import (
	"context"
	"time"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/log"
	"go.opentelemetry.io/otel/log/noop"
)

// LogEvent represents structured application log event data.
type LogEvent struct {
	Timestamp   time.Time
	Severity    log.Severity
	SeverityTxt string
	EventName   string
	Message     string
	Attributes  []attribute.KeyValue
}

// BuildRecord constructs a log.Record from a LogEvent.
func BuildRecord(ev LogEvent) log.Record {
	var r log.Record
	if !ev.Timestamp.IsZero() {
		r.SetTimestamp(ev.Timestamp)
		r.SetObservedTimestamp(ev.Timestamp)
	}
	r.SetSeverity(ev.Severity)
	r.SetSeverityText(ev.SeverityTxt)
	r.SetEventName(ev.EventName)
	r.SetBody(attribute.StringValue(ev.Message))
	if len(ev.Attributes) > 0 {
		r.AddAttributes(ev.Attributes...)
	}
	return r
}

// ExtractAttributes collects attributes from a log.Record into a map.
func ExtractAttributes(r *log.Record) map[string]attribute.Value {
	attrs := make(map[string]attribute.Value, r.AttributesLen())
	r.WalkAttributes(func(kv attribute.KeyValue) bool {
		attrs[string(kv.Key)] = kv.Value
		return true
	})
	return attrs
}

// NewNoopLogger creates a Logger using noop.NewLoggerProvider.
func NewNoopLogger(name, version string) log.Logger {
	provider := noop.NewLoggerProvider()
	return provider.Logger(name, log.WithInstrumentationVersion(version))
}

// EmitLog safely emits a record to the provided logger.
func EmitLog(ctx context.Context, logger log.Logger, r log.Record) {
	if logger != nil {
		logger.Emit(ctx, r)
	}
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel/log@v1.47.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/log@v1.47.0"
  ]
}

package test

import (
	"context"
	"errors"
	"testing"
	"time"

	sample "sample"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/log"
)

func TestContractRecord(t *testing.T) {
	now := time.Date(2026, 10, 10, 12, 0, 0, 0, time.UTC)
	event := sample.LogEvent{
		Timestamp:   now,
		Severity:    log.SeverityInfo,
		SeverityTxt: "INFO",
		EventName:   "user.login",
		Message:     "user logged in successfully",
		Attributes: []attribute.KeyValue{
			attribute.String("user.id", "usr_99"),
			attribute.Int("attempt", 1),
			attribute.Bool("success", true),
			attribute.Float64("duration_ms", 12.5),
		},
	}

	record := sample.BuildRecord(event)

	// 1. Record constructs with timestamp, observed timestamp, severity, severity text, event name, and body
	if !record.Timestamp().Equal(now) {
		t.Fatalf("expected timestamp %v, got %v", now, record.Timestamp())
	}
	if !record.ObservedTimestamp().Equal(now) {
		t.Fatalf("expected observed timestamp %v, got %v", now, record.ObservedTimestamp())
	}
	if record.Severity() != log.SeverityInfo {
		t.Fatalf("expected severity %v, got %v", log.SeverityInfo, record.Severity())
	}
	if record.SeverityText() != "INFO" {
		t.Fatalf("expected severity text INFO, got %s", record.SeverityText())
	}
	if record.EventName() != "user.login" {
		t.Fatalf("expected event name user.login, got %s", record.EventName())
	}
	if record.Body().AsString() != "user logged in successfully" {
		t.Fatalf("expected body match, got %s", record.Body().AsString())
	}

	// 2. Record adds and extracts typed KeyValue attributes for string, int, bool, and float
	if record.AttributesLen() != 4 {
		t.Fatalf("expected 4 attributes, got %d", record.AttributesLen())
	}
	attrs := sample.ExtractAttributes(&record)
	if attrs["user.id"].AsString() != "usr_99" {
		t.Fatalf("expected user.id usr_99, got %s", attrs["user.id"].AsString())
	}
	if attrs["attempt"].AsInt64() != 1 {
		t.Fatalf("expected attempt 1, got %d", attrs["attempt"].AsInt64())
	}
	if !attrs["success"].AsBool() {
		t.Fatalf("expected success true, got %v", attrs["success"].AsBool())
	}
	if attrs["duration_ms"].AsFloat64() != 12.5 {
		t.Fatalf("expected duration 12.5, got %f", attrs["duration_ms"].AsFloat64())
	}

	// 3. Record supports attribute inspection via WalkAttributes and AttributesLen
	walked := 0
	record.WalkAttributes(func(kv attribute.KeyValue) bool {
		walked++
		return true
	})
	if walked != 4 {
		t.Fatalf("expected WalkAttributes to walk 4 items, walked %d", walked)
	}

	// 4. Record Clone creates an independent copy preserving attributes and severity
	cloned := record.Clone()
	cloned.SetSeverity(log.SeverityError)
	cloned.SetSeverityText("ERROR")
	cloned.SetErr(errors.New("test error"))
	cloned.AddAttributes(attribute.String("extra", "val"))

	if record.Severity() != log.SeverityInfo {
		t.Fatalf("original severity mutated: got %v, want %v", record.Severity(), log.SeverityInfo)
	}
	if record.AttributesLen() != 4 {
		t.Fatalf("original attributes mutated: got %d, want 4", record.AttributesLen())
	}
	if record.Err() != nil {
		t.Fatalf("original err mutated: got %v, want nil", record.Err())
	}
	if cloned.Severity() != log.SeverityError {
		t.Fatalf("cloned severity mismatch: got %v, want %v", cloned.Severity(), log.SeverityError)
	}
	if cloned.AttributesLen() != 5 {
		t.Fatalf("cloned attributes len mismatch: got %d, want 5", cloned.AttributesLen())
	}
	if cloned.Err() == nil {
		t.Fatal("expected cloned err to be non-nil")
	}

	// 5. LoggerProvider creates a Logger that emits log records and evaluates Enabled
	ctx := context.Background()
	logger := sample.NewNoopLogger("test-logger", "1.0.0")
	if logger == nil {
		t.Fatal("expected non-nil logger")
	}
	enabled := logger.Enabled(ctx, log.EnabledParameters{})
	_ = enabled
	sample.EmitLog(ctx, logger, record)
	sample.EmitLog(ctx, logger, cloned)
}