go.opentelemetry.io/otel/sdk v1.39.0: resource.New

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/sdk/resource.New in pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/sdk/resource.New

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:sha256:22bd77080d7415064bade7e6e56073f3e56ee043a46327f8ea91ebadbe1e5c7a","contract":["resource.New with WithAttributes and WithSchemaURL constructs a Resource containing the configured key-value attributes and schema URL","resource.New with WithDetectors invokes custom Detector implementations and merges their detected attributes into the resulting Resource","resource.New returns resource.ErrSchemaURLConflict alongside a merged partial Resource when options specify conflicting schema URLs"],"goal":"verify go.opentelemetry.io/otel/sdk/resource.New in pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/sdk/resource.New"]},"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/sdk@v1.39.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0","symbols":["go.opentelemetry.io/otel/sdk/resource.New"],"verifierAdapter":"golang@1"}

module sample

go 1.24.0

require (
	go.opentelemetry.io/otel v1.39.0
	go.opentelemetry.io/otel/sdk v1.39.0
)

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
	github.com/google/uuid v1.6.0 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel/metric v1.39.0 // indirect
	go.opentelemetry.io/otel/trace v1.39.0 // indirect
	golang.org/x/sys v0.39.0 // 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/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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 v1.39.0 h1:8yPrr/S0ND9QEfTfdP9V+SiwT4E0G7Y5MO7p85nis48=
go.opentelemetry.io/otel v1.39.0/go.mod h1:kLlFTywNWrFyEdH0oj2xK0bFYZtHRYUdv1NklR/tgc8=
go.opentelemetry.io/otel/metric v1.39.0 h1:d1UzonvEZriVfpNKEVmHXbdf909uGTOQjA0HF0Ls5Q0=
go.opentelemetry.io/otel/metric v1.39.0/go.mod h1:jrZSWL33sD7bBxg1xjrqyDjnuzTUB0x1nBERXd7Ftcs=
go.opentelemetry.io/otel/sdk v1.39.0 h1:nMLYcjVsvdui1B/4FRkwjzoRVsMK8uL/cj0OyhKzt18=
go.opentelemetry.io/otel/sdk v1.39.0/go.mod h1:vDojkC4/jsTJsE+kh+LXYQlbL8CgrEcwmt1ENZszdJE=
go.opentelemetry.io/otel/sdk/metric v1.39.0 h1:cXMVVFVgsIf2YL6QkRF4Urbr/aMInf+2WKg+sEJTtB8=
go.opentelemetry.io/otel/sdk/metric v1.39.0/go.mod h1:xq9HEVH7qeX69/JnwEfp6fVq5wosJsY1mt4lLfYdVew=
go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=
golang.org/x/sys v0.39.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/sdk/resource.New in pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/sdk@v1.39.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/sdk/resource.New"
  ]
}

package main

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

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/sdk/resource"
)

type customDetector struct {
	res *resource.Resource
	err error
}

func (d customDetector) Detect(ctx context.Context) (*resource.Resource, error) {
	return d.res, d.err
}

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

	// 1. resource.New with WithAttributes and WithSchemaURL creates a resource with those attributes and schema URL
	res, err := resource.New(
		ctx,
		resource.WithSchemaURL("https://example.com/schemas/1.0.0"),
		resource.WithAttributes(
			attribute.String("service.name", "inventory-api"),
			attribute.Int("service.instance.num", 2),
		),
	)
	if err != nil {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: unexpected error from resource.New: %v\n", err)
		os.Exit(1)
	}
	if res.SchemaURL() != "https://example.com/schemas/1.0.0" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected SchemaURL https://example.com/schemas/1.0.0, got %q\n", res.SchemaURL())
		os.Exit(1)
	}
	val, ok := res.Set().Value(attribute.Key("service.name"))
	if !ok || val.AsString() != "inventory-api" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected service.name=inventory-api, got %v (ok=%v)\n", val, ok)
		os.Exit(1)
	}

	// 2. resource.New with WithDetectors merges attributes from multiple detectors
	det1 := customDetector{
		res: resource.NewSchemaless(attribute.String("host.arch", "amd64")),
	}
	det2 := customDetector{
		res: resource.NewSchemaless(attribute.String("deployment.env", "staging")),
	}
	merged, err := resource.New(ctx, resource.WithDetectors(det1, det2))
	if err != nil {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: unexpected error from resource.New with detectors: %v\n", err)
		os.Exit(1)
	}
	archVal, archOk := merged.Set().Value(attribute.Key("host.arch"))
	envVal, envOk := merged.Set().Value(attribute.Key("deployment.env"))
	if !archOk || archVal.AsString() != "amd64" || !envOk || envVal.AsString() != "staging" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: detector attributes not merged properly: %v\n", merged.Attributes())
		os.Exit(1)
	}

	// 3. resource.New returns ErrSchemaURLConflict when merging options with conflicting schema URLs
	conflictDet := customDetector{
		res: resource.NewWithAttributes(
			"https://example.com/schemas/2.0.0",
			attribute.String("region", "us-east"),
		),
	}
	conflictRes, err := resource.New(
		ctx,
		resource.WithSchemaURL("https://example.com/schemas/1.0.0"),
		resource.WithDetectors(conflictDet),
	)
	if !errors.Is(err, resource.ErrSchemaURLConflict) {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected ErrSchemaURLConflict, got %v\n", err)
		os.Exit(1)
	}
	if conflictRes == nil {
		fmt.Fprintln(os.Stderr, "assertion 3 failed: expected non-nil partial resource on schema conflict")
		os.Exit(1)
	}
}