go.opentelemetry.io/otel/trace v1.38.0

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/trace@v1.38.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0

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:sha256:8d8a0d2820cff7d3b9866d3ca2fd8a4915c14dfed3b4e124c856b4cd15262360","contract":["TraceIDFromHex and SpanIDFromHex parse valid hex strings into TraceID and SpanID values","ParseTraceState parses W3C tracestate entries and Get retrieves the vendor value","NewSpanContext constructs a valid, sampled, remote SpanContext from SpanContextConfig","ContextWithRemoteSpanContext injects a remote SpanContext into context and SpanContextFromContext retrieves an equal SpanContext","noop.NewTracerProvider creates a Tracer whose Start method returns a non-nil, non-recording Span stored in the returned context"],"goal":"verify pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0"],"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/trace@v1.38.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.24.0

require go.opentelemetry.io/otel/trace v1.38.0

require go.opentelemetry.io/otel v1.38.0 // indirect

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 v1.38.0 h1:RkfdswUDRimDg0m2Az18RKOsnI8UDzppJAtj01/Ymk8=
go.opentelemetry.io/otel v1.38.0/go.mod h1:zcmtmQ1+YmQM9wrNsTGV/q/uyusom3P8RxwExxkZhjM=
go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJrmcNLE=
go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
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"
)

func CreateValidSpanContext() (trace.SpanContext, error) {
	tid, err := trace.TraceIDFromHex("0102030405060708090a0b0c0d0e0f10")
	if err != nil {
		return trace.SpanContext{}, err
	}
	sid, err := trace.SpanIDFromHex("0102030405060708")
	if err != nil {
		return trace.SpanContext{}, err
	}
	ts, err := trace.ParseTraceState("vendor=value")
	if err != nil {
		return trace.SpanContext{}, err
	}
	sc := trace.NewSpanContext(trace.SpanContextConfig{
		TraceID:    tid,
		SpanID:     sid,
		TraceFlags: trace.FlagsSampled,
		TraceState: ts,
		Remote:     true,
	})
	return sc, nil
}

func InjectAndExtractSpanContext(ctx context.Context, sc trace.SpanContext) trace.SpanContext {
	ctxWithSC := trace.ContextWithRemoteSpanContext(ctx, sc)
	return trace.SpanContextFromContext(ctxWithSC)
}

func StartNoopSpan(ctx context.Context, name string) (context.Context, trace.Span) {
	tp := noop.NewTracerProvider()
	tracer := tp.Tracer("example.com/tracer")
	return tracer.Start(ctx, name, trace.WithSpanKind(trace.SpanKindInternal))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/trace@v1.38.0"
  ]
}

package main

import (
	"context"
	"os"

	"example.com/sample"
	"go.opentelemetry.io/otel/trace"
)

func main() {
	sc, err := sample.CreateValidSpanContext()
	if err != nil {
		os.Exit(1)
	}
	if !sc.IsValid() || !sc.IsSampled() || !sc.IsRemote() {
		os.Exit(1)
	}
	if sc.TraceID().String() != "0102030405060708090a0b0c0d0e0f10" {
		os.Exit(1)
	}
	if sc.SpanID().String() != "0102030405060708" {
		os.Exit(1)
	}
	if sc.TraceState().Get("vendor") != "value" {
		os.Exit(1)
	}

	ctx := context.Background()
	extracted := sample.InjectAndExtractSpanContext(ctx, sc)
	if !extracted.Equal(sc) || !extracted.IsRemote() {
		os.Exit(1)
	}

	spanCtx, span := sample.StartNoopSpan(ctx, "work")
	if span == nil || span.IsRecording() {
		os.Exit(1)
	}
	fromCtx := trace.SpanFromContext(spanCtx)
	if fromCtx == nil {
		os.Exit(1)
	}
	span.AddEvent("step")
	span.End()
}