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package database
import (
"database/sql"
"fmt"
)
// returns true in case of successful deletion
func (db *DB) DeleteState(name string) (bool, error) {
result, err := db.Exec(`DELETE FROM states WHERE name = ?;`, name)
if err != nil {
return false, err
}
n, err := result.RowsAffected()
if err != nil {
return false, err
}
return n == 1, nil
}
func (db *DB) GetState(name string) ([]byte, error) {
var encryptedData []byte
err := db.QueryRow(`SELECT data FROM states WHERE name = ?;`, name).Scan(&encryptedData)
if err != nil {
return nil, err
}
return db.dataEncryptionKey.DecryptAES256(encryptedData)
}
// returns true in case of id mismatch
func (db *DB) SetState(name string, data []byte, id string) (bool, error) {
encryptedData, err := db.dataEncryptionKey.EncryptAES256(data)
if err != nil {
return false, err
}
if id == "" {
_, err = db.Exec(
`INSERT INTO states(name, data) VALUES (:name, :data) ON CONFLICT DO UPDATE SET data = :data WHERE name = :name;`,
sql.Named("data", encryptedData),
sql.Named("name", name),
)
return false, err
} else {
result, err := db.Exec(`UPDATE states SET data = ? WHERE name = ? and lock->>'ID' = ?;`, encryptedData, name, id)
if err != nil {
return false, err
}
n, err := result.RowsAffected()
if err != nil {
return false, err
}
if n != 1 {
return true, fmt.Errorf("failed to update state, lock ID does not match")
}
return false, nil
}
}
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