github.com/envoyproxy/go-control-plane v0.9.4: core.Node

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/envoyproxy/go-control-plane/envoy/api/v2/core.Node in pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4
Demonstrate these symbols/APIs:
  - github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node

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:sha256:079ddf937460ae6b8c410e0a786482f4201a570c0137c0420dcdc557e24cb238","contract":["core.Node initializes with ID, Cluster, and Locality","core.Node UserAgent and ClientFeatures getters return configured values","core.Node Validate succeeds on valid configuration","core.Node String returns formatted text and Reset clears all fields"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node in pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4","kind":"HOW","packages":["pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4"],"schemaVersion":1,"symbols":["github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node"]},"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/envoyproxy/go-control-plane@v0.9.4"],"schemaVersion":1,"subject":"pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4","symbols":["github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/envoyproxy/go-control-plane v0.9.4

require (
	github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f // indirect
	github.com/envoyproxy/protoc-gen-validate v0.1.0 // indirect
	github.com/golang/protobuf v1.3.2 // indirect
)

cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f h1:WBZRG4aNOuI15bLRrCgN8fCq8E5Xuty6jGbmSNEvSsU=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.4 h1:rEvIZUSZ3fx39WIi3JkQqQBitGwpELBIYWeBVh6wn+E=
github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

package main

import (
	"fmt"

	core "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
)

func main() {
	node := &core.Node{
		Id:      "sample-node",
		Cluster: "sample-cluster",
		Locality: &core.Locality{
			Region: "us-west-2",
			Zone:   "us-west-2a",
		},
		UserAgentName: "envoy",
	}

	if err := node.Validate(); err != nil {
		fmt.Printf("Validation error: %v\n", err)
		return
	}

	fmt.Printf("Node configured: ID=%s, Cluster=%s, Region=%s\n",
		node.GetId(), node.GetCluster(), node.GetLocality().GetRegion())
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node in pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/envoyproxy/go-control-plane@v0.9.4"
  ],
  "symbols": [
    "github.com/envoyproxy/go-control-plane/envoy/api/v2/core.Node"
  ]
}

package main

import (
	"fmt"
	"os"

	core "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
)

func main() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func runTests() error {
	// Assertion 1: core.Node initializes with ID, Cluster, and Locality
	node := &core.Node{
		Id:      "node-proxy-1",
		Cluster: "gateway-cluster",
		Locality: &core.Locality{
			Region:  "us-east-1",
			Zone:    "us-east-1a",
			SubZone: "sub-1",
		},
		UserAgentName: "envoy",
		UserAgentVersionType: &core.Node_UserAgentVersion{
			UserAgentVersion: "1.14.1",
		},
		ClientFeatures: []string{"envoy.config.validators"},
	}

	if node.GetId() != "node-proxy-1" {
		return fmt.Errorf("expected node Id 'node-proxy-1', got %q", node.GetId())
	}
	if node.GetCluster() != "gateway-cluster" {
		return fmt.Errorf("expected cluster 'gateway-cluster', got %q", node.GetCluster())
	}

	loc := node.GetLocality()
	if loc == nil {
		return fmt.Errorf("expected locality to be non-nil")
	}
	if loc.GetRegion() != "us-east-1" || loc.GetZone() != "us-east-1a" || loc.GetSubZone() != "sub-1" {
		return fmt.Errorf("unexpected locality values: %+v", loc)
	}

	// Assertion 2: core.Node UserAgent and ClientFeatures getters return configured values
	if node.GetUserAgentName() != "envoy" {
		return fmt.Errorf("expected user agent name 'envoy', got %q", node.GetUserAgentName())
	}
	if node.GetUserAgentVersion() != "1.14.1" {
		return fmt.Errorf("expected user agent version '1.14.1', got %q", node.GetUserAgentVersion())
	}
	features := node.GetClientFeatures()
	if len(features) != 1 || features[0] != "envoy.config.validators" {
		return fmt.Errorf("unexpected client features: %+v", features)
	}

	// Assertion 3: core.Node Validate succeeds on valid configuration
	if err := node.Validate(); err != nil {
		return fmt.Errorf("node.Validate() failed: %w", err)
	}

	// Assertion 4: core.Node String returns formatted text and Reset clears all fields
	if s := node.String(); s == "" {
		return fmt.Errorf("expected non-empty string representation from node.String()")
	}

	node.Reset()
	if node.GetId() != "" || node.GetCluster() != "" || node.GetLocality() != nil {
		return fmt.Errorf("expected node fields to be reset, got: ID=%q Cluster=%q Locality=%v",
			node.GetId(), node.GetCluster(), node.GetLocality())
	}

	return nil
}