CodeSampleX

サンプル

google.golang.org/api v0.13.0: iterator.PageInfo

検証済みサンプル — golang google.golang.org/api v0.13.0: iterator.PageInfo. go 1.26 · linux debian/x64 · docker で contract を実行し、成功しました.

sha256:02a13c196c199fbb36e14c2149d4f4d6b4fcd9da598e6653d336a3f313489a7a

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 linux 24 · ubuntu · glibc 2.39 x64 go

検証実行環境

環境 コントラクト ステージ 実行日
go 1.26 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26@sha256:e30143be198a…		 2026-10-20

ケース

HOW
ゴール
verify google.golang.org/api/iterator.PageInfo in pkg:golang/google.golang.org/api@v0.13.0
パッケージ
シンボル
  • google.golang.org/api/iterator.PageInfo
作成日
2026-10-20T18:38:38Z

コントラクト

  1. PageInfo tracks pagination token and max page size for pageable iterators
  2. PageInfo.Remaining reports the number of buffered items remaining before next fetch
  3. Pager retrieves items page by page using PageInfo token and buffer
  4. PageInfo detects and prevents mixed calls to Next and NextPage on the same iterator

ファイル

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • sample.go
  • spec.json
  • test/contract.go

ソースアーティファクトをダウンロード (tar.gz)

ソース

PROMPT.md
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/api/iterator.PageInfo in pkg:golang/google.golang.org/api@v0.13.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/api@v0.13.0
Demonstrate these symbols/APIs:
  - google.golang.org/api/iterator.PageInfo

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.
csx.json
{"case":{"caseId":"case:sha256:7887c59a87256d195a02eb61f771dd66fcc800b7bcc8e34a3d0a327849759dd1","contract":["PageInfo tracks pagination token and max page size for pageable iterators","PageInfo.Remaining reports the number of buffered items remaining before next fetch","Pager retrieves items page by page using PageInfo token and buffer","PageInfo detects and prevents mixed calls to Next and NextPage on the same iterator"],"goal":"verify google.golang.org/api/iterator.PageInfo in pkg:golang/google.golang.org/api@v0.13.0","kind":"HOW","packages":["pkg:golang/google.golang.org/api@v0.13.0"],"schemaVersion":1,"symbols":["google.golang.org/api/iterator.PageInfo"]},"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/api@v0.13.0"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/api@v0.13.0","symbols":["google.golang.org/api/iterator.PageInfo"],"verifierAdapter":"golang@1"}
go.mod
module example.com/iterator-sample

go 1.24

require google.golang.org/api v0.13.0
go.sum
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
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=
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golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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google.golang.org/api v0.13.0 h1:Q3Ui3V3/CVinFWFiW39Iw0kMuVrRzYX0wN6OPFp0lTA=
google.golang.org/api v0.13.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
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/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
sample.go
package sample

import (
	"google.golang.org/api/iterator"
)

// ItemIterator demonstrates paging using iterator.PageInfo.
type ItemIterator struct {
	pageInfo *iterator.PageInfo
	next     func() error
	items    []string
}

// NewItemIterator creates a new ItemIterator over pages of string items.
func NewItemIterator(pages map[string][]string, initialToken string) *ItemIterator {
	it := &ItemIterator{
		items: make([]string, 0),
	}
	it.pageInfo, it.next = iterator.NewPageInfo(
		func(pageSize int, pageToken string) (string, error) {
			items, ok := pages[pageToken]
			if !ok {
				return "", nil
			}
			it.items = append(it.items, items...)
			var nextTok string
			if pageToken == "" && len(pages) > 1 {
				nextTok = "token-page-2"
			}
			return nextTok, nil
		},
		func() int {
			return len(it.items)
		},
		func() interface{} {
			b := it.items
			it.items = nil
			if b == nil {
				return []string{}
			}
			return b
		},
	)
	it.pageInfo.Token = initialToken
	return it
}

// PageInfo returns the iterator's PageInfo.
func (it *ItemIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next item in the iterator.
func (it *ItemIterator) Next() (string, error) {
	if err := it.next(); err != nil {
		return "", err
	}
	item := it.items[0]
	it.items = it.items[1:]
	return item, nil
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/api/iterator.PageInfo in pkg:golang/google.golang.org/api@v0.13.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/api@v0.13.0"
  ],
  "symbols": [
    "google.golang.org/api/iterator.PageInfo"
  ]
}
test/contract.go
package main

import (
	"fmt"
	"os"
	"strings"

	sample "example.com/iterator-sample"
	"google.golang.org/api/iterator"
)

func main() {
	// Assertion 1: PageInfo tracks pagination token and max page size for pageable iterators
	{
		pages := map[string][]string{
			"":             {"alpha", "beta"},
			"token-page-2": {"gamma"},
		}
		it := sample.NewItemIterator(pages, "custom-start-token")
		pi := it.PageInfo()
		if pi == nil {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected non-nil PageInfo\n")
			os.Exit(1)
		}
		if pi.Token != "custom-start-token" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected token 'custom-start-token', got %q\n", pi.Token)
			os.Exit(1)
		}
		pi.MaxSize = 50
		if pi.MaxSize != 50 {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: expected MaxSize 50, got %d\n", pi.MaxSize)
			os.Exit(1)
		}
	}

	// Assertion 2: PageInfo.Remaining reports the number of buffered items remaining before next fetch
	{
		pages := map[string][]string{
			"": {"item1", "item2", "item3"},
		}
		it := sample.NewItemIterator(pages, "")
		pi := it.PageInfo()
		if rem := pi.Remaining(); rem != 0 {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected 0 remaining before first Next, got %d\n", rem)
			os.Exit(1)
		}

		item1, err := it.Next()
		if err != nil || item1 != "item1" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: unexpected first item: %s, err: %v\n", item1, err)
			os.Exit(1)
		}
		if rem := pi.Remaining(); rem != 2 {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected 2 remaining after first Next, got %d\n", rem)
			os.Exit(1)
		}

		item2, err := it.Next()
		if err != nil || item2 != "item2" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: unexpected second item: %s, err: %v\n", item2, err)
			os.Exit(1)
		}
		if rem := pi.Remaining(); rem != 1 {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected 1 remaining after second Next, got %d\n", rem)
			os.Exit(1)
		}

		item3, err := it.Next()
		if err != nil || item3 != "item3" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: unexpected third item: %s, err: %v\n", item3, err)
			os.Exit(1)
		}
		if rem := pi.Remaining(); rem != 0 {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected 0 remaining after third Next, got %d\n", rem)
			os.Exit(1)
		}

		_, err = it.Next()
		if err != iterator.Done {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: expected iterator.Done, got %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 3: Pager retrieves items page by page using PageInfo token and buffer
	{
		pages := map[string][]string{
			"":             {"page1-a", "page1-b"},
			"token-page-2": {"page2-a"},
		}
		it := sample.NewItemIterator(pages, "")
		pager := iterator.NewPager(it, 2, "")

		var page1 []string
		nextTok, err := pager.NextPage(&page1)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: unexpected error on page 1: %v\n", err)
			os.Exit(1)
		}
		if len(page1) != 2 || page1[0] != "page1-a" || page1[1] != "page1-b" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: unexpected page 1 items: %v\n", page1)
			os.Exit(1)
		}
		if nextTok != "token-page-2" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected next token 'token-page-2', got %q\n", nextTok)
			os.Exit(1)
		}

		var page2 []string
		nextTok2, err := pager.NextPage(&page2)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: unexpected error on page 2: %v\n", err)
			os.Exit(1)
		}
		if len(page2) != 1 || page2[0] != "page2-a" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: unexpected page 2 items: %v\n", page2)
			os.Exit(1)
		}
		if nextTok2 != "" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: expected empty next token, got %q\n", nextTok2)
			os.Exit(1)
		}
	}

	// Assertion 4: PageInfo detects and prevents mixed calls to Next and NextPage on the same iterator
	{
		pages := map[string][]string{
			"": {"item1", "item2"},
		}
		it := sample.NewItemIterator(pages, "")
		_, err := it.Next()
		if err != nil {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: unexpected error on Next: %v\n", err)
			os.Exit(1)
		}

		pager := iterator.NewPager(it, 1, "")
		var items []string
		_, err = pager.NextPage(&items)
		if err == nil {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: expected error on mixed NextPage call, got nil\n")
			os.Exit(1)
		}
		if !strings.Contains(err.Error(), "Next and NextPage called on same iterator") {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: unexpected error message: %v\n", err)
			os.Exit(1)
		}
	}

	fmt.Println("PASS: google.golang.org/api/iterator.PageInfo contract passed")
}

オリジンシーダー

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