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package database
import (
"database/sql"
"errors"
"fmt"
"slices"
)
// returns true in case of successful deletion
func (db *DB) DeleteState(path string) (bool, error) {
result, err := db.Exec(`DELETE FROM states WHERE path = ?;`, path)
if err != nil {
return false, err
}
n, err := result.RowsAffected()
if err != nil {
return false, err
}
return n == 1, nil
}
func (db *DB) GetState(path string) ([]byte, error) {
var encryptedData []byte
err := db.QueryRow(
`SELECT versions.data
FROM versions
JOIN states ON states.id = versions.state_id
WHERE states.path = ?
ORDER BY versions.id DESC
LIMIT 1;`,
path).Scan(&encryptedData)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return []byte{}, nil
}
return nil, err
}
if encryptedData == nil {
return []byte{}, nil
}
return db.dataEncryptionKey.DecryptAES256(encryptedData)
}
// returns true in case of id mismatch
func (db *DB) SetState(path string, accountID int, data []byte, lockID string) (bool, error) {
encryptedData, err := db.dataEncryptionKey.EncryptAES256(data)
if err != nil {
return false, err
}
ret := false
return ret, db.WithTransaction(func(tx *sql.Tx) error {
var (
stateID int64
lockData []byte
)
if err = tx.QueryRowContext(db.ctx, `SELECT id, lock->>'ID' FROM states WHERE path = ?;`, path).Scan(&stateID, &lockData); err != nil {
if errors.Is(err, sql.ErrNoRows) {
var result sql.Result
result, err = tx.ExecContext(db.ctx, `INSERT INTO states(path) VALUES (?)`, path)
if err != nil {
return err
}
stateID, err = result.LastInsertId()
if err != nil {
return err
}
} else {
return err
}
}
if lockID != "" && slices.Compare([]byte(lockID), lockData) != 0 {
err = fmt.Errorf("failed to update state, lock ID does not match")
ret = true
return err
}
_, err = tx.ExecContext(db.ctx,
`INSERT INTO versions(account_id, state_id, data, lock)
SELECT :accountID, :stateID, :data, lock
FROM states
WHERE states.id = :stateID;`,
sql.Named("accountID", accountID),
sql.Named("stateID", stateID),
sql.Named("data", encryptedData))
if err != nil {
return err
}
_, err = tx.ExecContext(db.ctx,
`DELETE FROM versions
WHERE state_id = (SELECT id
FROM states
WHERE path = :path)
AND id < (SELECT MIN(id)
FROM(SELECT versions.id
FROM versions
JOIN states ON states.id = versions.state_id
WHERE states.path = :path
ORDER BY versions.id DESC
LIMIT :limit));`,
sql.Named("limit", db.versionsHistoryLimit),
sql.Named("path", path),
)
return err
})
}
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