dev_agentandClaude Opus 5.5
c777668ef5
internal/store opens $MEALQUEST_DATA_DIR/mealquest.db with modernc.org/sqlite (CGO-free) as one writer connection and a read-only pool of four, with busy_timeout=5000, journal_mode=WAL and foreign_keys=ON on every connection. migrations/*.sql are embedded and applied at boot in filename order, each in its own transaction together with its schema_migrations row, so a failing migration rolls back and fails boot. A database holding a version this build does not know is refused. 0001_init.sql is a placeholder until the v1 schema lands. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
106 lines
2.9 KiB
Go
106 lines
2.9 KiB
Go
package store
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import (
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"context"
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"database/sql"
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"fmt"
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"io/fs"
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"strings"
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"time"
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)
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const createSchemaMigrations = `CREATE TABLE IF NOT EXISTS schema_migrations (
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version TEXT PRIMARY KEY,
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applied_at TEXT NOT NULL
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)`
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// Migrate applies every *.sql file at the root of migrations that is not yet
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// recorded in schema_migrations, in filename order. Each migration runs in its
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// own transaction together with the insert that records it, so a failing
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// migration leaves the database at the previous version. A version is the
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// file name without its .sql extension.
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//
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// The database must not hold a version unknown to migrations: that means it
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// was migrated by a newer build, and Migrate refuses to continue.
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func Migrate(ctx context.Context, db *sql.DB, migrations fs.FS) error {
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files, err := fs.Glob(migrations, "*.sql")
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if err != nil {
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return fmt.Errorf("migrate: list migrations: %w", err)
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}
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if len(files) == 0 {
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return fmt.Errorf("migrate: no migrations found")
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}
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if _, err := db.ExecContext(ctx, createSchemaMigrations); err != nil {
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return fmt.Errorf("migrate: create schema_migrations: %w", err)
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}
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applied, err := appliedVersions(ctx, db)
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if err != nil {
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return err
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}
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known := make(map[string]bool, len(files))
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for _, name := range files {
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known[strings.TrimSuffix(name, ".sql")] = true
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}
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for version := range applied {
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if !known[version] {
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return fmt.Errorf("migrate: database has version %q, which this build does not know", version)
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}
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}
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for _, name := range files { // fs.Glob returns names in lexical order
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version := strings.TrimSuffix(name, ".sql")
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if applied[version] {
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continue
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}
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body, err := fs.ReadFile(migrations, name)
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if err != nil {
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return fmt.Errorf("migrate: read %s: %w", name, err)
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}
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if err := apply(ctx, db, version, string(body)); err != nil {
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return fmt.Errorf("migrate: apply %s: %w", name, err)
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}
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}
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return nil
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}
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func appliedVersions(ctx context.Context, db *sql.DB) (map[string]bool, error) {
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rows, err := db.QueryContext(ctx, `SELECT version FROM schema_migrations`)
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if err != nil {
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return nil, fmt.Errorf("migrate: read schema_migrations: %w", err)
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}
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defer rows.Close()
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applied := make(map[string]bool)
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for rows.Next() {
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var v string
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if err := rows.Scan(&v); err != nil {
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return nil, fmt.Errorf("migrate: read schema_migrations: %w", err)
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}
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applied[v] = true
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}
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if err := rows.Err(); err != nil {
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return nil, fmt.Errorf("migrate: read schema_migrations: %w", err)
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}
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return applied, nil
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}
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func apply(ctx context.Context, db *sql.DB, version, body string) error {
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer tx.Rollback() // no-op once committed
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if _, err := tx.ExecContext(ctx, body); err != nil {
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return err
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}
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if _, err := tx.ExecContext(ctx,
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`INSERT INTO schema_migrations (version, applied_at) VALUES (?, ?)`,
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version, time.Now().UTC().Format(time.RFC3339),
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); err != nil {
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return err
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}
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return tx.Commit()
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}
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