github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443: v3.ResourceLocator_FILE

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 github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE in pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443
Demonstrate these symbols/APIs:
  - github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE

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:sha256:2ebeed07e920bbcf509266fea0b38aa6dd47f58813c1122d8903478b875222b9","contract":["ResourceLocator_FILE represents the FILE scheme enum value with numeric value 2 and string representation FILE","ResourceLocator initializes with Scheme set to ResourceLocator_FILE and verifies via GetScheme","ResourceLocator with ResourceLocator_FILE and valid ResourceType passes validation, while empty ResourceType fails validation","ResourceLocator with ResourceLocator_FILE serializes to and deserializes from binary Protobuf format satisfying proto.Equal","proto.Clone produces an isolated deep copy of ResourceLocator with ResourceLocator_FILE"],"goal":"verify github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE in pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443","kind":"HOW","packages":["pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443"],"schemaVersion":1,"symbols":["github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE"]},"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/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443"],"schemaVersion":1,"subject":"pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443","symbols":["github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE"],"verifierAdapter":"golang@1"}

module example.com/resourcelocator

go 1.23.0

require (
	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443
	google.golang.org/protobuf v1.33.0
)

require github.com/envoyproxy/protoc-gen-validate v1.0.4 // indirect

github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 h1:aQ3y1lwWyqYPiWZThqv1aFbZMiM9vblcSArJRf2Irls=
github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
github.com/envoyproxy/protoc-gen-validate v1.0.4 h1:gVPz/FMfvh57HdSJQyvBtF00j8JU4zdyUgIUNhlgg0A=
github.com/envoyproxy/protoc-gen-validate v1.0.4/go.mod h1:qys6tmnRsYrQqIhm2bvKZH4Blx/1gTIZ2UKVY1M+Yew=
github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

{
  "schemaVersion": 1,
  "goal": "verify github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE in pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/cncf/xds/go@v0.0.0-20250501225837-2ac532fd4443"
  ],
  "symbols": [
    "github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE"
  ]
}

package main

import (
	"fmt"
	"os"

	corev3 "github.com/cncf/xds/go/xds/core/v3"
	"google.golang.org/protobuf/proto"
)

func assert(condition bool, message string) {
	if !condition {
		fmt.Fprintf(os.Stderr, "assertion failed: %s\n", message)
		os.Exit(1)
	}
}

func main() {
	// Assertion 1: ResourceLocator_FILE represents the FILE scheme enum value with numeric value 2 and string representation FILE
	{
		fileScheme := corev3.ResourceLocator_FILE
		assert(fileScheme == 2, "expected ResourceLocator_FILE value to be 2")
		assert(fileScheme.Number() == 2, "expected ResourceLocator_FILE.Number() to be 2")
		assert(fileScheme.String() == "FILE", "expected ResourceLocator_FILE.String() to be FILE")
		assert(corev3.ResourceLocator_Scheme_name[int32(fileScheme)] == "FILE", "expected Scheme_name mapping to FILE")
		assert(corev3.ResourceLocator_Scheme_value["FILE"] == int32(fileScheme), "expected Scheme_value mapping to 2")
	}

	// Assertion 2: ResourceLocator initializes with Scheme set to ResourceLocator_FILE and verifies via GetScheme
	{
		locator := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_FILE,
			Id:           "config-file-1",
			Authority:    "example.com",
			ResourceType: "envoy.config.cluster.v3.Cluster",
		}
		assert(locator.GetScheme() == corev3.ResourceLocator_FILE, "expected GetScheme to return ResourceLocator_FILE")
		assert(locator.GetId() == "config-file-1", "expected Id config-file-1")
		assert(locator.GetAuthority() == "example.com", "expected Authority example.com")
		assert(locator.GetResourceType() == "envoy.config.cluster.v3.Cluster", "expected ResourceType")

		var nilLocator *corev3.ResourceLocator
		assert(nilLocator.GetScheme() == corev3.ResourceLocator_XDSTP, "nil locator GetScheme should return default XDSTP")
		assert(nilLocator.GetId() == "", "nil locator GetId should return empty string")
		assert(nilLocator.Validate() == nil, "nil locator Validate should return nil")
	}

	// Assertion 3: ResourceLocator with ResourceLocator_FILE and valid ResourceType passes validation, while empty ResourceType fails validation
	{
		validLocator := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_FILE,
			ResourceType: "envoy.config.cluster.v3.Cluster",
		}
		assert(validLocator.Validate() == nil, "expected valid ResourceLocator to pass Validate()")
		assert(validLocator.ValidateAll() == nil, "expected valid ResourceLocator to pass ValidateAll()")

		invalidLocator := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_FILE,
			ResourceType: "",
		}
		assert(invalidLocator.Validate() != nil, "expected empty ResourceType to fail Validate()")
		assert(invalidLocator.ValidateAll() != nil, "expected empty ResourceType to fail ValidateAll()")
	}

	// Assertion 4: ResourceLocator with ResourceLocator_FILE serializes to and deserializes from binary Protobuf format satisfying proto.Equal
	{
		orig := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_FILE,
			Id:           "file-resource-42",
			Authority:    "api.example.com",
			ResourceType: "envoy.config.endpoint.v3.ClusterLoadAssignment",
		}
		wire, err := proto.Marshal(orig)
		assert(err == nil, "proto.Marshal failed")
		assert(len(wire) > 0, "marshaled wire length is 0")

		unmarshaled := &corev3.ResourceLocator{}
		err = proto.Unmarshal(wire, unmarshaled)
		assert(err == nil, "proto.Unmarshal failed")
		assert(proto.Equal(orig, unmarshaled), "proto.Equal returned false after unmarshal")
		assert(unmarshaled.GetScheme() == corev3.ResourceLocator_FILE, "unmarshaled Scheme mismatch")
		assert(unmarshaled.GetId() == "file-resource-42", "unmarshaled Id mismatch")
		assert(unmarshaled.GetAuthority() == "api.example.com", "unmarshaled Authority mismatch")
		assert(unmarshaled.GetResourceType() == "envoy.config.endpoint.v3.ClusterLoadAssignment", "unmarshaled ResourceType mismatch")
	}

	// Assertion 5: proto.Clone produces an isolated deep copy of ResourceLocator with ResourceLocator_FILE
	{
		orig := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_FILE,
			Id:           "original-file-id",
			Authority:    "controlplane.example.com",
			ResourceType: "envoy.config.listener.v3.Listener",
		}
		cloned := proto.Clone(orig).(*corev3.ResourceLocator)
		assert(proto.Equal(orig, cloned), "cloned ResourceLocator must equal original")

		cloned.Scheme = corev3.ResourceLocator_HTTP
		cloned.Id = "mutated-id"
		assert(orig.GetScheme() == corev3.ResourceLocator_FILE, "original Scheme was mutated")
		assert(orig.GetId() == "original-file-id", "original Id was mutated")
		assert(cloned.GetScheme() == corev3.ResourceLocator_HTTP, "cloned Scheme was not updated")
		assert(cloned.GetId() == "mutated-id", "cloned Id was not updated")
	}

	fmt.Println("PASS: all github.com/cncf/xds/go/xds/core/v3.ResourceLocator_FILE contract assertions verified")
}