84 lines
2 KiB
Go
84 lines
2 KiB
Go
package database
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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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"slices"
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)
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// returns true in case of successful deletion
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func (db *DB) DeleteState(name string) (bool, error) {
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result, err := db.Exec(`DELETE FROM states WHERE name = ?;`, name)
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if err != nil {
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return false, err
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}
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n, err := result.RowsAffected()
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if err != nil {
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return false, err
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}
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return n == 1, nil
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}
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func (db *DB) GetState(name string) ([]byte, error) {
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var encryptedData []byte
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err := db.QueryRow(`SELECT versions.data FROM versions JOIN states ON states.id = versions.state_id WHERE states.name = ? ORDER BY versions.id DESC LIMIT 1;`, name).Scan(&encryptedData)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return []byte{}, nil
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}
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return nil, err
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}
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if encryptedData == nil {
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return []byte{}, nil
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}
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return db.dataEncryptionKey.DecryptAES256(encryptedData)
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}
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// returns true in case of id mismatch
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func (db *DB) SetState(name string, data []byte, lockID string) (bool, error) {
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encryptedData, err := db.dataEncryptionKey.EncryptAES256(data)
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if err != nil {
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return false, err
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}
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tx, err := db.Begin()
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if err != nil {
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return false, err
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}
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defer func() {
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if err != nil {
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_ = tx.Rollback()
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}
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}()
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var (
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stateID int64
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lockData []byte
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)
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if err = tx.QueryRowContext(db.ctx, `SELECT id, lock->>'ID' FROM states WHERE name = ?;`, name).Scan(&stateID, &lockData); err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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var result sql.Result
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result, err = tx.ExecContext(db.ctx, `INSERT INTO states(name) VALUES (?)`, name)
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if err != nil {
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return false, err
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}
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stateID, err = result.LastInsertId()
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if err != nil {
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return false, err
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}
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} else {
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return false, err
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}
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}
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if lockID != "" && slices.Compare([]byte(lockID), lockData) != 0 {
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err = fmt.Errorf("failed to update state, lock ID does not match")
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return true, err
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}
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_, err = tx.ExecContext(db.ctx, `INSERT INTO versions(state_id, data) VALUES (?, ?);`, stateID, encryptedData)
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if err != nil {
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return false, err
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}
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// TODO delete old states
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err = tx.Commit()
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return false, err
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}
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