159 lines
3.4 KiB
Go
159 lines
3.4 KiB
Go
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package main
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import (
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"database/sql"
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"errors"
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"fmt"
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"time"
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_ "modernc.org/sqlite"
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)
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const (
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timestampFormat = "2006-01-02 15:04:05"
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)
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var migrations = []string{
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`CREATE TABLE items ("id" TEXT UNIQUE, "kind" TEXT, "updated" TIMESTAMP, "body" TEXT)`,
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`PRAGMA journal_mode=WAL`,
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`PRAGMA synchronous=NORMAL`,
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`PRAGMA cache_size=2000`,
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}
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var (
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ErrInvalidConfiguration = errors.New("invalid configuration")
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ErrIncompatibleSQLMigration = errors.New("incompatible migration")
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ErrNotEnoughSQLMigrations = errors.New("already more migrations than wanted")
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ErrSqliteFailure = errors.New("sqlite returned an error")
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)
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type Sqlite struct {
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db *sql.DB
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}
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func NewSqlite(dbPath string) (*Sqlite, error) {
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db, err := sql.Open("sqlite", dbPath)
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if err != nil {
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return &Sqlite{}, fmt.Errorf("%w: %v", ErrInvalidConfiguration, err)
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}
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s := &Sqlite{
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db: db,
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}
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if err := s.migrate(migrations); err != nil {
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return &Sqlite{}, err
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}
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return s, nil
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}
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func (s *Sqlite) Update(item Syncable) error {
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if _, err := s.db.Exec(`
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INSERT INTO items
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(id, kind, updated, body)
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VALUES
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(?, ?, ?, ?)
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ON CONFLICT(id) DO UPDATE
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SET
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kind=?,
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updated=?,
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body=?`,
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item.ID, item.Kind, item.Updated.Format(timestampFormat), item.Item,
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item.Kind, item.Updated.Format(timestampFormat), item.Item); err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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return nil
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}
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func (s *Sqlite) Updated(t time.Time) ([]Syncable, error) {
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rows, err := s.db.Query(`
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SELECT id, kind, updated, body
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FROM items
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WHERE updated > ?`, t.Format(timestampFormat))
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if err != nil {
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return nil, fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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result := make([]Syncable, 0)
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defer rows.Close()
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for rows.Next() {
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var item Syncable
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if err := rows.Scan(&item.ID, &item.Kind, &item.Updated, &item.Item); err != nil {
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return nil, fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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result = append(result, item)
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}
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return result, nil
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}
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func (s *Sqlite) migrate(wanted []string) error {
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// admin table
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if _, err := s.db.Exec(`
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CREATE TABLE IF NOT EXISTS migration
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("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "query" TEXT)
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`); err != nil {
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return err
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}
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// find existing
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rows, err := s.db.Query(`SELECT query FROM migration ORDER BY id`)
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if err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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existing := []string{}
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for rows.Next() {
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var query string
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if err := rows.Scan(&query); err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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existing = append(existing, string(query))
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}
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rows.Close()
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// compare
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missing, err := compareMigrations(wanted, existing)
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if err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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// execute missing
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for _, query := range missing {
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if _, err := s.db.Exec(string(query)); err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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// register
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if _, err := s.db.Exec(`
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INSERT INTO migration
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(query) VALUES (?)
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`, query); err != nil {
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return fmt.Errorf("%w: %v", ErrSqliteFailure, err)
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}
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}
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return nil
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}
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func compareMigrations(wanted, existing []string) ([]string, error) {
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needed := []string{}
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if len(wanted) < len(existing) {
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return []string{}, ErrNotEnoughSQLMigrations
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}
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for i, want := range wanted {
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switch {
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case i >= len(existing):
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needed = append(needed, want)
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case want == existing[i]:
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// do nothing
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case want != existing[i]:
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return []string{}, fmt.Errorf("%w: %v", ErrIncompatibleSQLMigration, want)
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}
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}
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return needed, nil
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}
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