google.golang.org/grpc v1.82.0: codes.AlreadyExists

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/grpc/codes.AlreadyExists in pkg:golang/google.golang.org/grpc@v1.82.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/grpc@v1.82.0
Demonstrate these symbols/APIs:
  - google.golang.org/grpc/codes.AlreadyExists

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:sha256:07250f6585497a2127d005ac379dee0359f230cb5df2650663225dec263dc40e","contract":["codes.AlreadyExists represents entity creation failure because one already exists with integer code 6 and string representation 'AlreadyExists'.","codes.Code.UnmarshalJSON unmarshals string 'ALREADY_EXISTS' and numeric 6 to codes.AlreadyExists.","status.Error and status.FromError associate errors with codes.AlreadyExists, verifiable via status.Code."],"goal":"verify google.golang.org/grpc/codes.AlreadyExists in pkg:golang/google.golang.org/grpc@v1.82.0","kind":"HOW","packages":["pkg:golang/google.golang.org/grpc@v1.82.0"],"schemaVersion":1,"symbols":["google.golang.org/grpc/codes.AlreadyExists"]},"contractCommand":["go","test","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","moduleSystem":"go.mod","os":"linux","osVersionBucket":"24","packageManager":"go","runtime":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/google.golang.org/grpc@v1.82.0"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/grpc@v1.82.0","symbols":["google.golang.org/grpc/codes.AlreadyExists"],"verifierAdapter":"golang@1"}

module example.com/grpcalreadyexists

go 1.25.0

require google.golang.org/grpc v1.82.0

require (
	golang.org/x/sys v0.43.0 // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
	google.golang.org/protobuf v1.36.11 // indirect
)

github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
golang.org/x/net v0.53.0 h1:d+qAbo5L0orcWAr0a9JweQpjXF19LMXJE8Ey7hwOdUA=
golang.org/x/net v0.53.0/go.mod h1:JvMuJH7rrdiCfbeHoo3fCQU24Lf5JJwT9W3sJFulfgs=
golang.org/x/sys v0.43.0 h1:Rlag2XtaFTxp19wS8MXlJwTvoh8ArU6ezoyFsMyCTNI=
golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/text v0.36.0 h1:JfKh3XmcRPqZPKevfXVpI1wXPTqbkE5f7JA92a55Yxg=
golang.org/x/text v0.36.0/go.mod h1:NIdBknypM8iqVmPiuco0Dh6P5Jcdk8lJL0CUebqK164=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 h1:RmoJA1ujG+/lRGNfUnOMfhCy5EipVMyvUE+KNbPbTlw=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
google.golang.org/grpc v1.82.0 h1:vguDnZUPjE26w09A63VoxZPnvPjB5Riyc0mkXPFmAIU=
google.golang.org/grpc v1.82.0/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

package grpcalreadyexists

import (
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// IsAlreadyExists reports whether err has gRPC status code AlreadyExists.
func IsAlreadyExists(err error) bool {
	return status.Code(err) == codes.AlreadyExists
}

// NewAlreadyExistsError creates a gRPC error with status code AlreadyExists.
func NewAlreadyExistsError(msg string) error {
	return status.Error(codes.AlreadyExists, msg)
}

// AlreadyExistsCode returns the codes.AlreadyExists constant.
func AlreadyExistsCode() codes.Code {
	return codes.AlreadyExists
}

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/grpc/codes.AlreadyExists in pkg:golang/google.golang.org/grpc@v1.82.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/grpc@v1.82.0"
  ],
  "symbols": [
    "google.golang.org/grpc/codes.AlreadyExists"
  ]
}

package contract_test

import (
	"encoding/json"
	"errors"
	"testing"

	grpcalreadyexists "example.com/grpcalreadyexists"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

func TestAlreadyExistsValueAndString(t *testing.T) {
	if got := grpcalreadyexists.AlreadyExistsCode(); got != codes.AlreadyExists {
		t.Fatalf("expected AlreadyExistsCode() == codes.AlreadyExists, got %v", got)
	}

	if codes.AlreadyExists != 6 {
		t.Fatalf("expected codes.AlreadyExists == 6, got %d", codes.AlreadyExists)
	}

	if got := codes.AlreadyExists.String(); got != "AlreadyExists" {
		t.Fatalf("expected codes.AlreadyExists.String() == %q, got %q", "AlreadyExists", got)
	}
}

func TestAlreadyExistsJSONUnmarshal(t *testing.T) {
	var c codes.Code

	// Unmarshal string representation "ALREADY_EXISTS"
	if err := json.Unmarshal([]byte(`"ALREADY_EXISTS"`), &c); err != nil {
		t.Fatalf("json.Unmarshal ALREADY_EXISTS failed: %v", err)
	}
	if c != codes.AlreadyExists {
		t.Fatalf("expected codes.AlreadyExists, got %v", c)
	}

	// Unmarshal numeric representation 6
	var cNum codes.Code
	if err := json.Unmarshal([]byte(`6`), &cNum); err != nil {
		t.Fatalf("json.Unmarshal 6 failed: %v", err)
	}
	if cNum != codes.AlreadyExists {
		t.Fatalf("expected codes.AlreadyExists, got %v", cNum)
	}
}

func TestAlreadyExistsStatusAndHelper(t *testing.T) {
	msg := "resource already exists"
	err := grpcalreadyexists.NewAlreadyExistsError(msg)
	if err == nil {
		t.Fatalf("expected non-nil error")
	}

	if !grpcalreadyexists.IsAlreadyExists(err) {
		t.Fatalf("expected IsAlreadyExists(err) to be true")
	}

	st, ok := status.FromError(err)
	if !ok {
		t.Fatalf("expected status.FromError to return ok == true")
	}
	if st.Code() != codes.AlreadyExists {
		t.Fatalf("expected status code %v, got %v", codes.AlreadyExists, st.Code())
	}
	if st.Message() != msg {
		t.Fatalf("expected message %q, got %q", msg, st.Message())
	}

	// Verify other errors are not considered AlreadyExists
	if grpcalreadyexists.IsAlreadyExists(status.Error(codes.NotFound, "not found error")) {
		t.Fatalf("expected IsAlreadyExists to return false for NotFound error")
	}
	if grpcalreadyexists.IsAlreadyExists(errors.New("generic error")) {
		t.Fatalf("expected IsAlreadyExists to return false for generic error")
	}
	if grpcalreadyexists.IsAlreadyExists(nil) {
		t.Fatalf("expected IsAlreadyExists to return false for nil error")
	}
}