go.opentelemetry.io/otel/sdk v1.38.0: resource.ErrSchemaURLConflict

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.ErrSchemaURLConflict in pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/sdk/resource.ErrSchemaURLConflict

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:a94db4bcd0345acd2d178adf64924149280bd7b975163076f26564e96e556392","contract":["resource.Merge returns resource.ErrSchemaURLConflict alongside a non-nil Resource with an empty SchemaURL when merging two resources with distinct non-empty schema URLs","resource.Merge preserves attributes from both resources when returning resource.ErrSchemaURLConflict and overwrites colliding keys with values from the second resource","resource.New returns resource.ErrSchemaURLConflict and a partial Resource with an empty SchemaURL when a Detector produces a Resource whose SchemaURL conflicts with WithSchemaURL"],"goal":"verify go.opentelemetry.io/otel/sdk/resource.ErrSchemaURLConflict in pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/sdk/resource.ErrSchemaURLConflict"]},"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@v1.38.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0","symbols":["go.opentelemetry.io/otel/sdk/resource.ErrSchemaURLConflict"],"verifierAdapter":"golang@1"}

module sample

go 1.24.0

require (
	go.opentelemetry.io/otel v1.38.0
	go.opentelemetry.io/otel/sdk v1.38.0
)

require (
	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 v1.1.0 // indirect
	go.opentelemetry.io/otel/metric v1.38.0 // indirect
	go.opentelemetry.io/otel/trace v1.38.0 // indirect
	golang.org/x/sys v0.35.0 // 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/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 v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
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/metric v1.38.0 h1:Kl6lzIYGAh5M159u9NgiRkmoMKjvbsKtYRwgfrA6WpA=
go.opentelemetry.io/otel/metric v1.38.0/go.mod h1:kB5n/QoRM8YwmUahxvI3bO34eVtQf2i4utNVLr9gEmI=
go.opentelemetry.io/otel/sdk v1.38.0 h1:l48sr5YbNf2hpCUj/FoGhW9yDkl+Ma+LrVl8qaM5b+E=
go.opentelemetry.io/otel/sdk v1.38.0/go.mod h1:ghmNdGlVemJI3+ZB5iDEuk4bWA3GkTpW+DOoZMYBVVg=
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=
golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
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.ErrSchemaURLConflict in pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/sdk@v1.38.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/sdk/resource.ErrSchemaURLConflict"
  ]
}

package main

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

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

type schemaDetector struct {
	schemaURL string
	attrs     []attribute.KeyValue
}

func (d schemaDetector) Detect(ctx context.Context) (*resource.Resource, error) {
	return resource.NewWithAttributes(d.schemaURL, d.attrs...), nil
}

func main() {
	// 1. resource.Merge returns ErrSchemaURLConflict alongside a merged non-nil Resource with empty SchemaURL when merging two resources with distinct non-empty schema URLs
	resA := resource.NewWithAttributes(
		"https://example.com/schemas/1.0.0",
		attribute.String("service.name", "billing-worker"),
		attribute.String("deployment.env", "staging"),
	)
	resB := resource.NewWithAttributes(
		"https://example.com/schemas/2.0.0",
		attribute.String("deployment.env", "production"),
		attribute.String("cloud.region", "eu-central-1"),
	)

	merged, err := resource.Merge(resA, resB)
	if !errors.Is(err, resource.ErrSchemaURLConflict) {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected errors.Is(err, resource.ErrSchemaURLConflict), got %v\n", err)
		os.Exit(1)
	}
	if merged == nil {
		fmt.Fprintln(os.Stderr, "assertion 1 failed: expected non-nil merged Resource on ErrSchemaURLConflict")
		os.Exit(1)
	}
	if merged.SchemaURL() != "" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected empty SchemaURL on schema conflict, got %q\n", merged.SchemaURL())
		os.Exit(1)
	}

	// 2. Attributes from both resources are retained on ErrSchemaURLConflict, with the second resource's value overwriting the first on key collision
	svcVal, svcOk := merged.Set().Value(attribute.Key("service.name"))
	regVal, regOk := merged.Set().Value(attribute.Key("cloud.region"))
	envVal, envOk := merged.Set().Value(attribute.Key("deployment.env"))
	if !svcOk || svcVal.AsString() != "billing-worker" || !regOk || regVal.AsString() != "eu-central-1" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected merged attributes to be preserved, got %v\n", merged.Attributes())
		os.Exit(1)
	}
	if !envOk || envVal.AsString() != "production" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected second resource attribute 'production' to win collision, got %q\n", envVal.AsString())
		os.Exit(1)
	}

	// 3. resource.New returns ErrSchemaURLConflict and a partial Resource with empty SchemaURL when a Detector returns a Resource whose SchemaURL conflicts with WithSchemaURL
	det := schemaDetector{
		schemaURL: "https://example.com/schemas/2.0.0",
		attrs:     []attribute.KeyValue{attribute.String("host.name", "node-01")},
	}
	newRes, newErr := resource.New(
		context.Background(),
		resource.WithSchemaURL("https://example.com/schemas/1.0.0"),
		resource.WithDetectors(det),
	)
	if !errors.Is(newErr, resource.ErrSchemaURLConflict) {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected resource.New to return ErrSchemaURLConflict, got %v\n", newErr)
		os.Exit(1)
	}
	if newRes == nil || newRes.SchemaURL() != "" {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected non-nil resource with empty SchemaURL from resource.New, got %v\n", newRes)
		os.Exit(1)
	}
}