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

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.Resource 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.Resource

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:sha256:83d6373e9cba02ccd19377d297923e6de514f1d3cab9537b91b45a947317792a","contract":["resource.Resource methods SchemaURL, Len, Attributes, and String expose the schema URL and key-value attributes loaded via resource.New with WithSchemaURL and WithFromEnv","resource.Merge combines two *resource.Resource instances with matching schema URLs so the secondary Resource overrides duplicate keys and Resource.Equal reflects attribute equality","zero-value resource.Resource and nil *resource.Resource both have Len() == 0 and compare Equal to resource.Empty(), while merging Resources with different schema URLs returns resource.ErrSchemaURLConflict"],"goal":"verify go.opentelemetry.io/otel/sdk/resource.Resource 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.Resource"]},"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.Resource"],"verifierAdapter":"golang@1"}

module sample

go 1.24.0

require 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 v1.39.0 // 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/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
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.Resource 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.Resource"
  ]
}

package main

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

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

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

	if err := os.Setenv("OTEL_RESOURCE_ATTRIBUTES", "service.name=billing-worker,service.version=1.0.0"); err != nil {
		fmt.Fprintf(os.Stderr, "unexpected setenv error: %v\n", err)
		os.Exit(1)
	}

	var envRes *resource.Resource
	var err error
	envRes, err = resource.New(
		ctx,
		resource.WithSchemaURL("https://example.com/schema/1.0.0"),
		resource.WithFromEnv(),
	)
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected resource.New error: %v\n", err)
		os.Exit(1)
	}

	if envRes.SchemaURL() != "https://example.com/schema/1.0.0" {
		fmt.Fprintf(os.Stderr, "unexpected schema URL: %s\n", envRes.SchemaURL())
		os.Exit(1)
	}

	if envRes.Len() != 2 || len(envRes.Attributes()) != 2 {
		fmt.Fprintf(os.Stderr, "expected 2 attributes from env, got Len=%d\n", envRes.Len())
		os.Exit(1)
	}

	if !strings.Contains(envRes.String(), "service.name=billing-worker") {
		fmt.Fprintf(os.Stderr, "expected String() to contain service.name=billing-worker, got %s\n", envRes.String())
		os.Exit(1)
	}

	if err := os.Setenv("OTEL_RESOURCE_ATTRIBUTES", "service.version=1.1.0,deployment.environment=staging"); err != nil {
		fmt.Fprintf(os.Stderr, "unexpected setenv error: %v\n", err)
		os.Exit(1)
	}

	overrideRes, err := resource.New(
		ctx,
		resource.WithSchemaURL("https://example.com/schema/1.0.0"),
		resource.WithFromEnv(),
	)
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected overrideRes error: %v\n", err)
		os.Exit(1)
	}

	merged, err := resource.Merge(envRes, overrideRes)
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected merge error: %v\n", err)
		os.Exit(1)
	}

	if merged.Len() != 3 || merged.SchemaURL() != "https://example.com/schema/1.0.0" {
		fmt.Fprintf(os.Stderr, "unexpected merged resource state: Len=%d SchemaURL=%s\n", merged.Len(), merged.SchemaURL())
		os.Exit(1)
	}

	if !strings.Contains(merged.String(), "service.version=1.1.0") || !strings.Contains(merged.String(), "deployment.environment=staging") {
		fmt.Fprintf(os.Stderr, "expected merged String() to contain updated attributes, got %s\n", merged.String())
		os.Exit(1)
	}

	if merged.Equal(envRes) || !merged.Equal(merged) {
		fmt.Fprintf(os.Stderr, "unexpected Equal result on merged Resource\n")
		os.Exit(1)
	}

	var zeroRes resource.Resource
	var nilRes *resource.Resource
	if zeroRes.Len() != 0 || !zeroRes.Equal(resource.Empty()) || !nilRes.Equal(resource.Empty()) {
		fmt.Fprintf(os.Stderr, "expected zero and nil Resource to equal resource.Empty()\n")
		os.Exit(1)
	}

	conflicting := resource.NewWithAttributes("https://example.com/schema/2.0.0")
	_, conflictErr := resource.Merge(envRes, conflicting)
	if !errors.Is(conflictErr, resource.ErrSchemaURLConflict) {
		fmt.Fprintf(os.Stderr, "expected ErrSchemaURLConflict, got %v\n", conflictErr)
		os.Exit(1)
	}
}