parseMetadata function

MetaData parseMetadata(Map<String, Object?> data)

Parses the metadata JSON object that accompanies a migration. The main purpose of this function is to decode the array of base64-encoded operations.

Implementation

MetaData parseMetadata(Map<String, Object?> data) {
  try {
    final dataProtocol = data['protocol_version']! as String;

    if (dataProtocol != protocolVersion) {
      throw Exception(
        'Protocol version mismatch for migration. Expected: $protocolVersion. Got: $dataProtocol',
      );
    }

    final dataFormat = data['format']! as String;
    final dataOps =
        (data['ops']! as List<dynamic>).cast<String>().map(decode).toList();
    final dataVersion = data['version']! as String;

    // Now decode the `SatOpMigrate` operations inside the `ops` array
    final decoded = MetaData(
      format: dataFormat,
      ops: dataOps,
      protocolVersion: dataProtocol,
      version: dataVersion,
    );

    return decoded;
  } catch (e) {
    throw Exception('Failed to parse migration data, due to:\n$e');
  }
}