google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0: status.Status

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/status.Status in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0
Demonstrate these symbols/APIs:
  - google.golang.org/genproto/googleapis/rpc/status.Status

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:sha256:321cc6a90762dc65733b92f6cd98aadb90ef75e32a76f49e5c2d479fa1107dc4","contract":["status.Status initializes with code, message, and details, returning expected values via getters","proto.Marshal and proto.Unmarshal serialize and deserialize status.Status without data loss","anypb.MarshalFrom packs status.Status into an Any message with the correct type URL and unmarshals back","protojson.Marshal converts status.Status to JSON with field names and protojson.Unmarshal restores the status","status.Status details hold packed errdetails messages and unmarshal into concrete error detail types"],"goal":"verify google.golang.org/genproto/googleapis/rpc/status.Status in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0","kind":"HOW","packages":["pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0"],"schemaVersion":1,"symbols":["google.golang.org/genproto/googleapis/rpc/status.Status"]},"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@v0.0.0-20250728155136-f173205681a0"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0","symbols":["google.golang.org/genproto/googleapis/rpc/status.Status"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require (
	google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0
	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 v0.0.0-20250728155136-f173205681a0 h1:MAKi5q709QWfnkkpNQ0M12hYJ1+e8qYVDyowc4U1XZM=
google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
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/genproto/googleapis/rpc/status"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
)

func main() {
	// Create an ErrorInfo detail
	errorInfo := &errdetails.ErrorInfo{
		Reason: "RESOURCE_NOT_FOUND",
		Domain: "example.com",
		Metadata: map[string]string{
			"resource": "item_123",
		},
	}

	detailAny, err := anypb.New(errorInfo)
	if err != nil {
		panic(err)
	}

	// Create a status.Status message
	st := &status.Status{
		Code:    5, // NOT_FOUND
		Message: "Requested resource was not found",
		Details: []*anypb.Any{detailAny},
	}

	// Marshal to binary proto
	raw, err := proto.Marshal(st)
	if err != nil {
		panic(err)
	}

	// Marshal to JSON
	jsonBytes, err := protojson.Marshal(st)
	if err != nil {
		panic(err)
	}

	fmt.Printf("Status: Code=%d, Message=%q, Bytes=%d\n", st.GetCode(), st.GetMessage(), len(raw))
	fmt.Printf("JSON representation: %s\n", string(jsonBytes))
}

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/genproto/googleapis/rpc/status.Status in pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/genproto/googleapis/rpc@v0.0.0-20250728155136-f173205681a0"
  ],
  "symbols": [
    "google.golang.org/genproto/googleapis/rpc/status.Status"
  ]
}

package main

import (
	"fmt"
	"os"
	"reflect"

	"google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/genproto/googleapis/rpc/status"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
)

func main() {
	// Assertion 1: status.Status initializes with code, message, and details, returning expected values via getters
	{
		st := &status.Status{
			Code:    3, // INVALID_ARGUMENT
			Message: "Invalid user input provided",
			Details: []*anypb.Any{},
		}

		if st.GetCode() != 3 {
			fmt.Fprintf(os.Stderr, "FAIL: GetCode mismatch: got %d, want 3\n", st.GetCode())
			os.Exit(1)
		}

		if st.GetMessage() != "Invalid user input provided" {
			fmt.Fprintf(os.Stderr, "FAIL: GetMessage mismatch: got %q, want %q\n", st.GetMessage(), "Invalid user input provided")
			os.Exit(1)
		}

		if len(st.GetDetails()) != 0 {
			fmt.Fprintf(os.Stderr, "FAIL: GetDetails length mismatch: got %d, want 0\n", len(st.GetDetails()))
			os.Exit(1)
		}

		// Verify nil safety of getters
		var nilStatus *status.Status
		if nilStatus.GetCode() != 0 || nilStatus.GetMessage() != "" || nilStatus.GetDetails() != nil {
			fmt.Fprintf(os.Stderr, "FAIL: nil status getters did not return default zero values\n")
			os.Exit(1)
		}
	}

	// Assertion 2: proto.Marshal and proto.Unmarshal serialize and deserialize status.Status without data loss
	{
		orig := &status.Status{
			Code:    5, // NOT_FOUND
			Message: "Resource not found on server",
		}

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

		restored := &status.Status{}
		if err := proto.Unmarshal(wire, restored); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: proto.Unmarshal error: %v\n", err)
			os.Exit(1)
		}

		if !proto.Equal(orig, restored) {
			fmt.Fprintf(os.Stderr, "FAIL: restored status does not match original: got %+v, want %+v\n", restored, orig)
			os.Exit(1)
		}
	}

	// Assertion 3: anypb.MarshalFrom packs status.Status into an Any message with the correct type URL and unmarshals back
	{
		orig := &status.Status{
			Code:    14, // UNAVAILABLE
			Message: "Service temporarily unavailable",
		}

		anyMsg := new(anypb.Any)
		if err := anyMsg.MarshalFrom(orig); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: anypb.MarshalFrom error: %v\n", err)
			os.Exit(1)
		}

		expectedTypeURL := "type.googleapis.com/google.rpc.Status"
		if anyMsg.GetTypeUrl() != expectedTypeURL {
			fmt.Fprintf(os.Stderr, "FAIL: unexpected Any TypeUrl: got %q, want %q\n", anyMsg.GetTypeUrl(), expectedTypeURL)
			os.Exit(1)
		}

		unmarshaledMsg, err := anyMsg.UnmarshalNew()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: anyMsg.UnmarshalNew error: %v\n", err)
			os.Exit(1)
		}

		statusResult, ok := unmarshaledMsg.(*status.Status)
		if !ok {
			fmt.Fprintf(os.Stderr, "FAIL: UnmarshalNew returned unexpected type %T, want *status.Status\n", unmarshaledMsg)
			os.Exit(1)
		}

		if !proto.Equal(orig, statusResult) {
			fmt.Fprintf(os.Stderr, "FAIL: unmarshaled status does not match original\n")
			os.Exit(1)
		}
	}

	// Assertion 4: protojson.Marshal converts status.Status to JSON with field names and protojson.Unmarshal restores the status
	{
		orig := &status.Status{
			Code:    7, // PERMISSION_DENIED
			Message: "Caller does not have permission",
		}

		jsonBytes, err := protojson.Marshal(orig)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: protojson.Marshal error: %v\n", err)
			os.Exit(1)
		}

		restored := &status.Status{}
		if err := protojson.Unmarshal(jsonBytes, restored); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: protojson.Unmarshal error: %v\n", err)
			os.Exit(1)
		}

		if !proto.Equal(orig, restored) {
			fmt.Fprintf(os.Stderr, "FAIL: json roundtrip status mismatch: got %+v, want %+v\n", restored, orig)
			os.Exit(1)
		}
	}

	// Assertion 5: status.Status details hold packed errdetails messages and unmarshal into concrete error detail types
	{
		badReq := &errdetails.BadRequest{
			FieldViolations: []*errdetails.BadRequest_FieldViolation{
				{
					Field:       "username",
					Description: "Username must be alphanumeric and at least 3 characters",
				},
			},
		}

		detailAny, err := anypb.New(badReq)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: anypb.New error: %v\n", err)
			os.Exit(1)
		}

		st := &status.Status{
			Code:    3, // INVALID_ARGUMENT
			Message: "Request validation failed",
			Details: []*anypb.Any{detailAny},
		}

		if len(st.GetDetails()) != 1 {
			fmt.Fprintf(os.Stderr, "FAIL: expected 1 detail in status, got %d\n", len(st.GetDetails()))
			os.Exit(1)
		}

		detailMsg, err := st.GetDetails()[0].UnmarshalNew()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: detail UnmarshalNew error: %v\n", err)
			os.Exit(1)
		}

		restoredBadReq, ok := detailMsg.(*errdetails.BadRequest)
		if !ok {
			fmt.Fprintf(os.Stderr, "FAIL: detail type mismatch: got %T, want *errdetails.BadRequest\n", detailMsg)
			os.Exit(1)
		}

		if !reflect.DeepEqual(restoredBadReq.GetFieldViolations()[0].GetField(), "username") {
			fmt.Fprintf(os.Stderr, "FAIL: detail field mismatch: got %q, want 'username'\n", restoredBadReq.GetFieldViolations()[0].GetField())
			os.Exit(1)
		}
	}

	fmt.Println("All contract assertions passed.")
}