go.etcd.io/bbolt v1.3.9: open database create bucket and store retrieve key value pairs

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: open database create bucket and store retrieve key value pairs
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.etcd.io/bbolt@v1.3.9
Demonstrate these symbols/APIs:
  - bbolt.Bucket.Get
  - bbolt.Bucket.Put
  - bbolt.DB.Update
  - bbolt.DB.View
  - bbolt.Open
  - bbolt.Tx.CreateBucketIfNotExists
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:5026f6b4a996d7c69db8599698fc189045400cbd8fa1a6b851dd2bcd71c94819","contract":["bbolt.Open opens or creates a Bolt database file","bbolt.DB.Update and Tx.CreateBucketIfNotExists creates a bucket","bbolt.Bucket.Put stores a key-value pair in a bucket","bbolt.DB.View and bbolt.Bucket.Get retrieves the stored value"],"goal":"open database create bucket and store retrieve key value pairs","kind":"HOW","packages":["pkg:golang/go.etcd.io/bbolt@v1.3.9"],"schemaVersion":1,"symbols":["bbolt.Bucket.Get","bbolt.Bucket.Put","bbolt.DB.Update","bbolt.DB.View","bbolt.Open","bbolt.Tx.CreateBucketIfNotExists"]},"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/go.etcd.io/bbolt@v1.3.9"],"schemaVersion":1,"subject":"pkg:golang/go.etcd.io/bbolt@v1.3.9","symbols":["bbolt.Bucket.Get","bbolt.Bucket.Put","bbolt.DB.Update","bbolt.DB.View","bbolt.Open","bbolt.Tx.CreateBucketIfNotExists"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require go.etcd.io/bbolt v1.3.9

require golang.org/x/sys v0.4.0 // indirect

github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
go.etcd.io/bbolt v1.3.9 h1:8x7aARPEXiXbHmtUwAIv7eV2fQFHrLLavdiJ3uzJXoI=
go.etcd.io/bbolt v1.3.9/go.mod h1:zaO32+Ti0PK1ivdPtgMESzuzL2VPoIG1PCQNvOdo/dE=
golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "open database create bucket and store retrieve key value pairs",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.etcd.io/bbolt@v1.3.9"
  ],
  "symbols": [
    "bbolt.Bucket.Get",
    "bbolt.Bucket.Put",
    "bbolt.DB.Update",
    "bbolt.DB.View",
    "bbolt.Open",
    "bbolt.Tx.CreateBucketIfNotExists"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"

	"go.etcd.io/bbolt"
)

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

func runTests() error {
	tmpDir, err := os.MkdirTemp("", "csx-bbolt-test-*")
	if err != nil {
		return fmt.Errorf("create temp dir: %w", err)
	}
	defer os.RemoveAll(tmpDir)

	dbPath := filepath.Join(tmpDir, "test.db")

	// 1. Open database
	db, err := bbolt.Open(dbPath, 0600, nil)
	if err != nil {
		return fmt.Errorf("bbolt.Open failed: %w", err)
	}
	defer db.Close()

	bucketName := []byte("settings")
	key := []byte("theme")
	value := []byte("dark")

	// 2. Create bucket and put key-value in write transaction (DB.Update, Tx.CreateBucketIfNotExists, Bucket.Put)
	err = db.Update(func(tx *bbolt.Tx) error {
		b, err := tx.CreateBucketIfNotExists(bucketName)
		if err != nil {
			return fmt.Errorf("CreateBucketIfNotExists failed: %w", err)
		}
		if err := b.Put(key, value); err != nil {
			return fmt.Errorf("Bucket.Put failed: %w", err)
		}
		return nil
	})
	if err != nil {
		return fmt.Errorf("db.Update failed: %w", err)
	}

	// 3. Retrieve key-value in read-only transaction (DB.View, Bucket.Get)
	err = db.View(func(tx *bbolt.Tx) error {
		b := tx.Bucket(bucketName)
		if b == nil {
			return fmt.Errorf("expected bucket %s not found", bucketName)
		}
		got := b.Get(key)
		if !bytes.Equal(got, value) {
			return fmt.Errorf("expected value %q, got %q", value, got)
		}
		missing := b.Get([]byte("nonexistent"))
		if missing != nil {
			return fmt.Errorf("expected nil for nonexistent key, got %q", missing)
		}
		return nil
	})
	if err != nil {
		return fmt.Errorf("db.View failed: %w", err)
	}

	return nil
}