google.golang.org/genproto/googleapis/rpc v0.0.0-20260904194346-d0f1323225a4: errdetails.ErrorInfo

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 google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4
Demonstrate these symbols/APIs:
  - google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo

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:sha256:41fbec91b8be613cf8defe8c7bd140312f0aeede72c2db0d2d9378017d7bf9bc","contract":["ErrorInfo fields Reason, Domain, and Metadata store structured error details and are accessible via GetReason, GetDomain, and GetMetadata getters.","ErrorInfo getters return safe zero values (empty strings and nil map) when called on nil or zero-initialized ErrorInfo receivers.","ErrorInfo serializes and deserializes accurately with proto.Marshal and proto.Unmarshal, preserving all message fields.","ErrorInfo messages support deep copying with proto.Clone and semantic equality checks with proto.Equal.","ErrorInfo.Reset clears all fields back to zero state."],"goal":"verify google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4","kind":"HOW","packages":["pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4"],"schemaVersion":1,"symbols":["google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo"]},"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/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4","symbols":["google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo"],"verifierAdapter":"golang@1"}

module example.com/errorinfo

go 1.26.6

require (
	google.golang.org/genproto/googleapis/rpc v0.0.0-20260904194346-d0f1323225a4
	google.golang.org/protobuf v1.36.12
)

github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260904194346-d0f1323225a4 h1:5t+ZydAFj5kGVLrgCvLmpmCf9ylGRd64hpEronfRaws=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260904194346-d0f1323225a4/go.mod h1:DjtHYE8FKJLivXcBEjGwndXfIC23G0VpXiXKqG179uA=
google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

package main

import (
	"fmt"

	"google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/protobuf/proto"
)

func main() {
	info := &errdetails.ErrorInfo{
		Reason: "RESOURCE_QUOTA_EXCEEDED",
		Domain: "example.com",
		Metadata: map[string]string{
			"quota_limit": "1000",
			"quota_used":  "1050",
		},
	}

	fmt.Printf("Reason: %s\n", info.GetReason())
	fmt.Printf("Domain: %s\n", info.GetDomain())
	fmt.Printf("Metadata count: %d\n", len(info.GetMetadata()))

	data, err := proto.Marshal(info)
	if err != nil {
		panic(err)
	}

	var decoded errdetails.ErrorInfo
	if err := proto.Unmarshal(data, &decoded); err != nil {
		panic(err)
	}

	fmt.Printf("Decoded Reason: %s\n", decoded.GetReason())
}

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20260904194346-d0f1323225a4"
  ],
  "symbols": [
    "google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo"
  ]
}

package main

import (
	"fmt"
	"os"
	"reflect"

	"google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/protobuf/proto"
)

func main() {
	// Assertion 1: ErrorInfo fields Reason, Domain, and Metadata store structured error details and are accessible via GetReason, GetDomain, and GetMetadata getters.
	{
		meta := map[string]string{
			"service": "billing.example.com",
			"quota":   "daily_requests",
		}
		info := &errdetails.ErrorInfo{
			Reason:   "RATE_LIMIT_EXCEEDED",
			Domain:   "example.com",
			Metadata: meta,
		}

		if got := info.GetReason(); got != "RATE_LIMIT_EXCEEDED" {
			fmt.Fprintf(os.Stderr, "FAIL: GetReason() = %q, want RATE_LIMIT_EXCEEDED\n", got)
			os.Exit(1)
		}
		if got := info.GetDomain(); got != "example.com" {
			fmt.Fprintf(os.Stderr, "FAIL: GetDomain() = %q, want example.com\n", got)
			os.Exit(1)
		}
		if got := info.GetMetadata(); !reflect.DeepEqual(got, meta) {
			fmt.Fprintf(os.Stderr, "FAIL: GetMetadata() = %v, want %v\n", got, meta)
			os.Exit(1)
		}
	}

	// Assertion 2: ErrorInfo getters return safe zero values (empty strings and nil map) when called on nil or zero-initialized ErrorInfo receivers.
	{
		var nilInfo *errdetails.ErrorInfo
		if got := nilInfo.GetReason(); got != "" {
			fmt.Fprintf(os.Stderr, "FAIL: nil.GetReason() = %q, want empty string\n", got)
			os.Exit(1)
		}
		if got := nilInfo.GetDomain(); got != "" {
			fmt.Fprintf(os.Stderr, "FAIL: nil.GetDomain() = %q, want empty string\n", got)
			os.Exit(1)
		}
		if got := nilInfo.GetMetadata(); got != nil {
			fmt.Fprintf(os.Stderr, "FAIL: nil.GetMetadata() = %v, want nil\n", got)
			os.Exit(1)
		}

		zeroInfo := &errdetails.ErrorInfo{}
		if got := zeroInfo.GetReason(); got != "" {
			fmt.Fprintf(os.Stderr, "FAIL: zero.GetReason() = %q, want empty string\n", got)
			os.Exit(1)
		}
		if got := zeroInfo.GetDomain(); got != "" {
			fmt.Fprintf(os.Stderr, "FAIL: zero.GetDomain() = %q, want empty string\n", got)
			os.Exit(1)
		}
		if got := zeroInfo.GetMetadata(); got != nil {
			fmt.Fprintf(os.Stderr, "FAIL: zero.GetMetadata() = %v, want nil\n", got)
			os.Exit(1)
		}
	}

	// Assertion 3: ErrorInfo serializes and deserializes accurately with proto.Marshal and proto.Unmarshal, preserving all message fields.
	{
		original := &errdetails.ErrorInfo{
			Reason: "AUTH_EXPIRED",
			Domain: "auth.example.com",
			Metadata: map[string]string{
				"user_id": "usr_12345",
				"realm":   "eu-central-1",
			},
		}

		data, err := proto.Marshal(original)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: proto.Marshal failed: %v\n", err)
			os.Exit(1)
		}

		var decoded errdetails.ErrorInfo
		if err := proto.Unmarshal(data, &decoded); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: proto.Unmarshal failed: %v\n", err)
			os.Exit(1)
		}

		if !proto.Equal(original, &decoded) {
			fmt.Fprintf(os.Stderr, "FAIL: unmarshaled proto does not match original: got %+v, want %+v\n", &decoded, original)
			os.Exit(1)
		}
		if decoded.GetReason() != original.GetReason() {
			fmt.Fprintf(os.Stderr, "FAIL: decoded Reason = %q, want %q\n", decoded.GetReason(), original.GetReason())
			os.Exit(1)
		}
		if decoded.GetDomain() != original.GetDomain() {
			fmt.Fprintf(os.Stderr, "FAIL: decoded Domain = %q, want %q\n", decoded.GetDomain(), original.GetDomain())
			os.Exit(1)
		}
		if !reflect.DeepEqual(decoded.GetMetadata(), original.GetMetadata()) {
			fmt.Fprintf(os.Stderr, "FAIL: decoded Metadata = %v, want %v\n", decoded.GetMetadata(), original.GetMetadata())
			os.Exit(1)
		}
	}

	// Assertion 4: ErrorInfo messages support deep copying with proto.Clone and semantic equality checks with proto.Equal.
	{
		original := &errdetails.ErrorInfo{
			Reason: "PERMISSION_DENIED",
			Domain: "iam.example.com",
			Metadata: map[string]string{
				"resource": "doc_999",
			},
		}

		cloned, ok := proto.Clone(original).(*errdetails.ErrorInfo)
		if !ok || !proto.Equal(original, cloned) {
			fmt.Fprintf(os.Stderr, "FAIL: cloned message not equal to original\n")
			os.Exit(1)
		}

		cloned.Reason = "PERMISSION_GRANTED"
		if proto.Equal(original, cloned) {
			fmt.Fprintf(os.Stderr, "FAIL: expected messages to differ after modifying clone\n")
			os.Exit(1)
		}
	}

	// Assertion 5: ErrorInfo.Reset clears all fields back to zero state.
	{
		info := &errdetails.ErrorInfo{
			Reason: "TEMPORARY_UNAVAILABLE",
			Domain: "api.example.com",
			Metadata: map[string]string{
				"retry_after": "30s",
			},
		}

		info.Reset()
		if info.GetReason() != "" {
			fmt.Fprintf(os.Stderr, "FAIL: after Reset, GetReason() = %q, want empty string\n", info.GetReason())
			os.Exit(1)
		}
		if info.GetDomain() != "" {
			fmt.Fprintf(os.Stderr, "FAIL: after Reset, GetDomain() = %q, want empty string\n", info.GetDomain())
			os.Exit(1)
		}
		if info.GetMetadata() != nil {
			fmt.Fprintf(os.Stderr, "FAIL: after Reset, GetMetadata() = %v, want nil\n", info.GetMetadata())
			os.Exit(1)
		}
	}

	fmt.Println("PASS: google.golang.org/genproto/googleapis/rpc/errdetails.ErrorInfo contract passed")
}