89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package sqlite
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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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_ "github.com/mutecomm/go-sqlcipher" // We require go sqlcipher that overrides default implementation
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)
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const (
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// The reduced number of kdf iterations (for performance reasons) which is
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// currently used for derivation of the database key
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// https://github.com/status-im/status-go/pull/1343
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// https://notes.status.im/i8Y_l7ccTiOYq09HVgoFwA
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kdfIterationsNumber = 3200
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// WALMode for sqlite.
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WALMode = "wal"
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)
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func openDB(path, key string) (*sql.DB, error) {
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db, err := sql.Open("sqlite3", path)
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if err != nil {
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return nil, err
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}
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// Disable concurrent access as not supported by the driver
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db.SetMaxOpenConns(1)
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if _, err = db.Exec("PRAGMA foreign_keys=ON"); err != nil {
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return nil, err
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}
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keyString := fmt.Sprintf("PRAGMA key = '%s'", key)
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if _, err = db.Exec(keyString); err != nil {
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return nil, errors.New("failed to set key pragma")
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}
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if _, err = db.Exec(fmt.Sprintf("PRAGMA kdf_iter = '%d'", kdfIterationsNumber)); err != nil {
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return nil, err
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}
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// readers do not block writers and faster i/o operations
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// https://www.sqlite.org/draft/wal.html
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// must be set after db is encrypted
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var mode string
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err = db.QueryRow("PRAGMA journal_mode=WAL").Scan(&mode)
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if err != nil {
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return nil, err
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}
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if mode != WALMode {
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return nil, fmt.Errorf("unable to set journal_mode to WAL. actual mode %s", mode)
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}
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return db, nil
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}
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// OpenDB opens not-encrypted database.
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func OpenDB(path, key string) (*sql.DB, error) {
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return openDB(path, key)
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}
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// OpenUnecryptedDB opens database with setting PRAGMA key.
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func OpenUnecryptedDB(path string) (*sql.DB, error) {
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db, err := sql.Open("sqlite3", path)
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if err != nil {
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return nil, err
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}
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// Disable concurrent access as not supported by the driver
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db.SetMaxOpenConns(1)
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if _, err = db.Exec("PRAGMA foreign_keys=ON"); err != nil {
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return nil, err
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}
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// readers do not block writers and faster i/o operations
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// https://www.sqlite.org/draft/wal.html
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// must be set after db is encrypted
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var mode string
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err = db.QueryRow("PRAGMA journal_mode=WAL").Scan(&mode)
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if err != nil {
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return nil, err
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}
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if mode != WALMode {
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return nil, fmt.Errorf("unable to set journal_mode to WAL. actual mode %s", mode)
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}
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return db, nil
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}
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