redis_006.py

class RDBParser:
    def __init__(self, file_path: str):
        self.file_path = file_path
        self.data: Dict[int, Dict[str, Any]] = {}  # database -> key -> value
        self.aux_fields: Dict[str, str] = {}  # Store auxiliary fields
        self.current_db = 0

    def parse(self) -> Dict[int, Dict[str, Any]]:
        """Parse the RDB file and return the data structure"""
        with open(self.file_path, "rb") as f:
            magic = f.read(5)
            if magic != b"REDIS":
                raise ValueError("Invalid RDB file format")

            version = f.read(4)
            if not version.startswith(b"00"):
                raise ValueError(f"Unsupported RDB version: {version.decode()}")

            while True:
                type_byte = f.read(1)
                if not type_byte:
                    break

                op_type = type_byte[0]

                if op_type == RDBOperationType.EOF:
                    break
                elif op_type == RDBOperationType.SELECTDB:
                    self.current_db = self._read_length(f)
                    if self.current_db not in self.data:
                        self.data[self.current_db] = {}
                elif op_type == RDBOperationType.EXPIRETIME:
                    expire_time = struct.unpack("I", f.read(4))[0]
                    self._process_key_value_pair(f, expire_time * 1000)
                elif op_type == RDBOperationType.EXPIRETIME_MS:
                    expire_time = struct.unpack("Q", f.read(8))[0]
                    self._process_key_value_pair(f, expire_time)
                elif op_type == RDBOperationType.AUX:
                    aux_key = self._read_string(f)
                    aux_value = self._read_string(f)
                    self.aux_fields[aux_key] = aux_value
                elif op_type == RDBOperationType.RESIZEDB:
                    # Read hash table sizes
                    db_size = self._read_length(f)  # noqa: F841
                    expire_size = self._read_length(f)  # noqa: F841
                    # Could store these sizes if needed
                else:
                    self._process_key_value_pair(f, None, op_type)

            # Verify CRC64 (8 bytes)
            crc = f.read(8)  # noqa: F841
            # TODO: Implement CRC verification

        return self.data