| 1 |
package storage |
| 2 |
|
| 3 |
import ( |
| 4 |
"database/sql" |
| 5 |
"errors" |
| 6 |
"fmt" |
| 7 |
"time" |
| 8 |
|
| 9 |
_ "github.com/mattn/go-sqlite3" |
| 10 |
|
| 11 |
"github.com/lain/larc/internal/core" |
| 12 |
) |
| 13 |
|
| 14 |
/* SQLite storage for larc metadata. |
| 15 |
* Handles revisions, branches, trees, and state. |
| 16 |
* All operations use single connection with WAL mode for speed. */ |
| 17 |
|
| 18 |
var ( |
| 19 |
ErrRevisionNotFound = errors.New("revision not found") |
| 20 |
ErrBranchNotFound = errors.New("branch not found") |
| 21 |
ErrTreeNotFound = errors.New("tree not found") |
| 22 |
) |
| 23 |
|
| 24 |
const schema = ` |
| 25 |
CREATE TABLE IF NOT EXISTS revisions ( |
| 26 |
number INTEGER PRIMARY KEY, |
| 27 |
timestamp INTEGER NOT NULL, |
| 28 |
author TEXT NOT NULL, |
| 29 |
message TEXT NOT NULL, |
| 30 |
branch TEXT NOT NULL, |
| 31 |
parent INTEGER, |
| 32 |
merge_parent INTEGER, |
| 33 |
tree_hash TEXT NOT NULL |
| 34 |
); |
| 35 |
|
| 36 |
CREATE TABLE IF NOT EXISTS branches ( |
| 37 |
name TEXT PRIMARY KEY, |
| 38 |
head_rev INTEGER NOT NULL, |
| 39 |
created_at INTEGER NOT NULL, |
| 40 |
created_from INTEGER |
| 41 |
); |
| 42 |
|
| 43 |
CREATE TABLE IF NOT EXISTS trees ( |
| 44 |
hash TEXT PRIMARY KEY, |
| 45 |
data BLOB NOT NULL |
| 46 |
); |
| 47 |
|
| 48 |
CREATE TABLE IF NOT EXISTS state ( |
| 49 |
key TEXT PRIMARY KEY, |
| 50 |
value TEXT NOT NULL |
| 51 |
); |
| 52 |
|
| 53 |
CREATE INDEX IF NOT EXISTS idx_revisions_branch ON revisions(branch, number DESC); |
| 54 |
CREATE INDEX IF NOT EXISTS idx_revisions_timestamp ON revisions(timestamp); |
| 55 |
` |
| 56 |
|
| 57 |
// MetaStore manages SQLite metadata storage |
| 58 |
type MetaStore struct { |
| 59 |
db *sql.DB |
| 60 |
} |
| 61 |
|
| 62 |
// NewMetaStore opens or creates a metadata store |
| 63 |
func NewMetaStore(path string) (*MetaStore, error) { |
| 64 |
db, err := sql.Open("sqlite3", path+"?_journal_mode=WAL&_synchronous=NORMAL&_busy_timeout=5000") |
| 65 |
if err != nil { |
| 66 |
return nil, fmt.Errorf("open sqlite: %w", err) |
| 67 |
} |
| 68 |
|
| 69 |
/* single connection for consistency */ |
| 70 |
db.SetMaxOpenConns(1) |
| 71 |
|
| 72 |
if _, err := db.Exec(schema); err != nil { |
| 73 |
db.Close() |
| 74 |
return nil, fmt.Errorf("init schema: %w", err) |
| 75 |
} |
| 76 |
|
| 77 |
return &MetaStore{db: db}, nil |
| 78 |
} |
| 79 |
|
| 80 |
// Close closes the database connection |
| 81 |
func (m *MetaStore) Close() error { |
| 82 |
return m.db.Close() |
| 83 |
} |
| 84 |
|
| 85 |
// NextRevision returns the next revision number and increments counter |
| 86 |
func (m *MetaStore) NextRevision() (int64, error) { |
| 87 |
tx, err := m.db.Begin() |
| 88 |
if err != nil { |
| 89 |
return 0, fmt.Errorf("begin tx: %w", err) |
| 90 |
} |
| 91 |
defer tx.Rollback() |
| 92 |
|
| 93 |
var next int64 |
| 94 |
row := tx.QueryRow("SELECT COALESCE(MAX(number), 0) + 1 FROM revisions") |
| 95 |
if err := row.Scan(&next); err != nil { |
| 96 |
return 0, fmt.Errorf("get max revision: %w", err) |
| 97 |
} |
| 98 |
|
| 99 |
if err := tx.Commit(); err != nil { |
| 100 |
return 0, fmt.Errorf("commit: %w", err) |
| 101 |
} |
| 102 |
|
| 103 |
return next, nil |
| 104 |
} |
| 105 |
|
| 106 |
// CreateRevision creates a new revision |
| 107 |
func (m *MetaStore) CreateRevision(rev *core.Revision) error { |
| 108 |
_, err := m.db.Exec(` |
| 109 |
INSERT INTO revisions (number, timestamp, author, message, branch, parent, merge_parent, tree_hash) |
| 110 |
VALUES (?, ?, ?, ?, ?, ?, ?, ?) |
| 111 |
`, rev.Number, rev.Timestamp, rev.Author, rev.Message, rev.Branch, rev.Parent, rev.MergeParent, rev.TreeHash) |
| 112 |
|
| 113 |
if err != nil { |
| 114 |
return fmt.Errorf("insert revision: %w", err) |
| 115 |
} |
| 116 |
|
| 117 |
return nil |
| 118 |
} |
| 119 |
|
| 120 |
// GetRevision retrieves a revision by number |
| 121 |
func (m *MetaStore) GetRevision(number int64) (*core.Revision, error) { |
| 122 |
rev := &core.Revision{} |
| 123 |
err := m.db.QueryRow(` |
| 124 |
SELECT number, timestamp, author, message, branch, parent, merge_parent, tree_hash |
| 125 |
FROM revisions WHERE number = ? |
| 126 |
`, number).Scan(&rev.Number, &rev.Timestamp, &rev.Author, &rev.Message, &rev.Branch, &rev.Parent, &rev.MergeParent, &rev.TreeHash) |
| 127 |
|
| 128 |
if err != nil { |
| 129 |
if errors.Is(err, sql.ErrNoRows) { |
| 130 |
return nil, ErrRevisionNotFound |
| 131 |
} |
| 132 |
return nil, fmt.Errorf("get revision: %w", err) |
| 133 |
} |
| 134 |
|
| 135 |
return rev, nil |
| 136 |
} |
| 137 |
|
| 138 |
// GetLatestRevision returns the most recent revision number |
| 139 |
func (m *MetaStore) GetLatestRevision() (int64, error) { |
| 140 |
var latest int64 |
| 141 |
err := m.db.QueryRow("SELECT COALESCE(MAX(number), 0) FROM revisions").Scan(&latest) |
| 142 |
if err != nil { |
| 143 |
return 0, fmt.Errorf("get latest revision: %w", err) |
| 144 |
} |
| 145 |
return latest, nil |
| 146 |
} |
| 147 |
|
| 148 |
// ListRevisions returns revisions in descending order |
| 149 |
func (m *MetaStore) ListRevisions(branch string, limit, offset int) ([]*core.Revision, error) { |
| 150 |
var rows *sql.Rows |
| 151 |
var err error |
| 152 |
|
| 153 |
if branch == "" { |
| 154 |
rows, err = m.db.Query(` |
| 155 |
SELECT number, timestamp, author, message, branch, parent, merge_parent, tree_hash |
| 156 |
FROM revisions ORDER BY number DESC LIMIT ? OFFSET ? |
| 157 |
`, limit, offset) |
| 158 |
} else { |
| 159 |
rows, err = m.db.Query(` |
| 160 |
SELECT number, timestamp, author, message, branch, parent, merge_parent, tree_hash |
| 161 |
FROM revisions WHERE branch = ? ORDER BY number DESC LIMIT ? OFFSET ? |
| 162 |
`, branch, limit, offset) |
| 163 |
} |
| 164 |
|
| 165 |
if err != nil { |
| 166 |
return nil, fmt.Errorf("list revisions: %w", err) |
| 167 |
} |
| 168 |
defer rows.Close() |
| 169 |
|
| 170 |
var revs []*core.Revision |
| 171 |
for rows.Next() { |
| 172 |
rev := &core.Revision{} |
| 173 |
if err := rows.Scan(&rev.Number, &rev.Timestamp, &rev.Author, &rev.Message, &rev.Branch, &rev.Parent, &rev.MergeParent, &rev.TreeHash); err != nil { |
| 174 |
return nil, fmt.Errorf("scan revision: %w", err) |
| 175 |
} |
| 176 |
revs = append(revs, rev) |
| 177 |
} |
| 178 |
|
| 179 |
return revs, nil |
| 180 |
} |
| 181 |
|
| 182 |
// CreateBranch creates a new branch |
| 183 |
func (m *MetaStore) CreateBranch(branch *core.Branch) error { |
| 184 |
_, err := m.db.Exec(` |
| 185 |
INSERT INTO branches (name, head_rev, created_at, created_from) |
| 186 |
VALUES (?, ?, ?, ?) |
| 187 |
`, branch.Name, branch.HeadRev, branch.CreatedAt, branch.CreatedFrom) |
| 188 |
|
| 189 |
if err != nil { |
| 190 |
return fmt.Errorf("insert branch: %w", err) |
| 191 |
} |
| 192 |
|
| 193 |
return nil |
| 194 |
} |
| 195 |
|
| 196 |
// GetBranch retrieves a branch by name |
| 197 |
func (m *MetaStore) GetBranch(name string) (*core.Branch, error) { |
| 198 |
branch := &core.Branch{} |
| 199 |
err := m.db.QueryRow(` |
| 200 |
SELECT name, head_rev, created_at, created_from |
| 201 |
FROM branches WHERE name = ? |
| 202 |
`, name).Scan(&branch.Name, &branch.HeadRev, &branch.CreatedAt, &branch.CreatedFrom) |
| 203 |
|
| 204 |
if err != nil { |
| 205 |
if errors.Is(err, sql.ErrNoRows) { |
| 206 |
return nil, ErrBranchNotFound |
| 207 |
} |
| 208 |
return nil, fmt.Errorf("get branch: %w", err) |
| 209 |
} |
| 210 |
|
| 211 |
return branch, nil |
| 212 |
} |
| 213 |
|
| 214 |
// UpdateBranchHead updates the head revision of a branch |
| 215 |
func (m *MetaStore) UpdateBranchHead(name string, headRev int64) error { |
| 216 |
result, err := m.db.Exec("UPDATE branches SET head_rev = ? WHERE name = ?", headRev, name) |
| 217 |
if err != nil { |
| 218 |
return fmt.Errorf("update branch head: %w", err) |
| 219 |
} |
| 220 |
|
| 221 |
rows, _ := result.RowsAffected() |
| 222 |
if rows == 0 { |
| 223 |
return ErrBranchNotFound |
| 224 |
} |
| 225 |
|
| 226 |
return nil |
| 227 |
} |
| 228 |
|
| 229 |
// ListBranches returns all branches |
| 230 |
func (m *MetaStore) ListBranches() ([]*core.Branch, error) { |
| 231 |
rows, err := m.db.Query("SELECT name, head_rev, created_at, created_from FROM branches ORDER BY name") |
| 232 |
if err != nil { |
| 233 |
return nil, fmt.Errorf("list branches: %w", err) |
| 234 |
} |
| 235 |
defer rows.Close() |
| 236 |
|
| 237 |
var branches []*core.Branch |
| 238 |
for rows.Next() { |
| 239 |
branch := &core.Branch{} |
| 240 |
if err := rows.Scan(&branch.Name, &branch.HeadRev, &branch.CreatedAt, &branch.CreatedFrom); err != nil { |
| 241 |
return nil, fmt.Errorf("scan branch: %w", err) |
| 242 |
} |
| 243 |
branches = append(branches, branch) |
| 244 |
} |
| 245 |
|
| 246 |
return branches, nil |
| 247 |
} |
| 248 |
|
| 249 |
// DeleteBranch removes a branch |
| 250 |
func (m *MetaStore) DeleteBranch(name string) error { |
| 251 |
result, err := m.db.Exec("DELETE FROM branches WHERE name = ?", name) |
| 252 |
if err != nil { |
| 253 |
return fmt.Errorf("delete branch: %w", err) |
| 254 |
} |
| 255 |
|
| 256 |
rows, _ := result.RowsAffected() |
| 257 |
if rows == 0 { |
| 258 |
return ErrBranchNotFound |
| 259 |
} |
| 260 |
|
| 261 |
return nil |
| 262 |
} |
| 263 |
|
| 264 |
// StoreTree stores a tree manifest |
| 265 |
func (m *MetaStore) StoreTree(hash string, data []byte) error { |
| 266 |
_, err := m.db.Exec("INSERT OR IGNORE INTO trees (hash, data) VALUES (?, ?)", hash, data) |
| 267 |
if err != nil { |
| 268 |
return fmt.Errorf("store tree: %w", err) |
| 269 |
} |
| 270 |
return nil |
| 271 |
} |
| 272 |
|
| 273 |
// GetTree retrieves a tree manifest |
| 274 |
func (m *MetaStore) GetTree(hash string) ([]byte, error) { |
| 275 |
var data []byte |
| 276 |
err := m.db.QueryRow("SELECT data FROM trees WHERE hash = ?", hash).Scan(&data) |
| 277 |
if err != nil { |
| 278 |
if errors.Is(err, sql.ErrNoRows) { |
| 279 |
return nil, ErrTreeNotFound |
| 280 |
} |
| 281 |
return nil, fmt.Errorf("get tree: %w", err) |
| 282 |
} |
| 283 |
return data, nil |
| 284 |
} |
| 285 |
|
| 286 |
// SetState sets a key-value pair in state table |
| 287 |
func (m *MetaStore) SetState(key, value string) error { |
| 288 |
_, err := m.db.Exec("INSERT OR REPLACE INTO state (key, value) VALUES (?, ?)", key, value) |
| 289 |
if err != nil { |
| 290 |
return fmt.Errorf("set state: %w", err) |
| 291 |
} |
| 292 |
return nil |
| 293 |
} |
| 294 |
|
| 295 |
// GetState gets a value from state table |
| 296 |
func (m *MetaStore) GetState(key string) (string, error) { |
| 297 |
var value string |
| 298 |
err := m.db.QueryRow("SELECT value FROM state WHERE key = ?", key).Scan(&value) |
| 299 |
if err != nil { |
| 300 |
if errors.Is(err, sql.ErrNoRows) { |
| 301 |
return "", nil |
| 302 |
} |
| 303 |
return "", fmt.Errorf("get state: %w", err) |
| 304 |
} |
| 305 |
return value, nil |
| 306 |
} |
| 307 |
|
| 308 |
// InitRepo initializes a new repository with default branch |
| 309 |
func (m *MetaStore) InitRepo() error { |
| 310 |
branch := &core.Branch{ |
| 311 |
Name: core.DefaultBranchName, |
| 312 |
HeadRev: 0, |
| 313 |
CreatedAt: time.Now().Unix(), |
| 314 |
CreatedFrom: 0, |
| 315 |
} |
| 316 |
|
| 317 |
if err := m.CreateBranch(branch); err != nil { |
| 318 |
return fmt.Errorf("create default branch: %w", err) |
| 319 |
} |
| 320 |
|
| 321 |
return nil |
| 322 |
} |
| 323 |
|