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# MIT License |
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# |
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# Copyright (c) 2017 Matt Boyer |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy |
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# of this software and associated documentation files (the "Software"), to deal |
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# in the Software without restriction, including without limitation the rights |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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# copies of the Software, and to permit persons to whom the Software is |
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# furnished to do so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included in |
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# all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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from . import _LOGGER |
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from .field import (Field, MalformedField) |
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from .utils import (Varint, IndexDict) |
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class MalformedRecord(Exception): |
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pass |
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View Code Duplication |
class Record(object): |
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column_types = { |
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0: (0, "NULL"), |
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1: (1, "8-bit twos-complement integer"), |
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2: (2, "big-endian 16-bit twos-complement integer"), |
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3: (3, "big-endian 24-bit twos-complement integer"), |
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4: (4, "big-endian 32-bit twos-complement integer"), |
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5: (6, "big-endian 48-bit twos-complement integer"), |
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6: (8, "big-endian 64-bit twos-complement integer"), |
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7: (8, "Floating point"), |
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8: (0, "Integer 0"), |
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9: (0, "Integer 1"), |
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} |
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def __init__(self, record_bytes): |
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self._bytes = record_bytes |
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self._header_bytes = None |
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self._fields = IndexDict() |
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self._parse() |
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def __bytes__(self): |
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return self._bytes |
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@property |
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def header(self): |
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return self._header_bytes |
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@property |
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def fields(self): |
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return self._fields |
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def truncate(self, new_length): |
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self._bytes = self._bytes[:new_length] |
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self._parse() |
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def _parse(self): |
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header_offset = 0 |
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header_length_varint = Varint( |
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# A varint is encoded on *at most* 9 bytes |
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bytes(self)[header_offset:9 + header_offset] |
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) |
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# Let's keep track of how many bytes of the Record header (including |
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# the header length itself) we've succesfully parsed |
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parsed_header_bytes = len(header_length_varint) |
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if len(bytes(self)) < int(header_length_varint): |
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raise MalformedRecord( |
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"Not enough bytes to fully read the record header!" |
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) |
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header_offset += len(header_length_varint) |
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self._header_bytes = bytes(self)[:int(header_length_varint)] |
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col_idx = 0 |
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field_offset = int(header_length_varint) |
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while header_offset < int(header_length_varint): |
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serial_type_varint = Varint( |
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bytes(self)[header_offset:9 + header_offset] |
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) |
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serial_type = int(serial_type_varint) |
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col_length = None |
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try: |
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col_length, _ = self.column_types[serial_type] |
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except KeyError as col_type_ex: |
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if serial_type >= 13 and (1 == serial_type % 2): |
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col_length = (serial_type - 13) // 2 |
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elif serial_type >= 12 and (0 == serial_type % 2): |
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col_length = (serial_type - 12) // 2 |
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else: |
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raise ValueError( |
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"Unknown serial type {}".format(serial_type) |
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) from col_type_ex |
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try: |
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field_obj = Field( |
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col_idx, |
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serial_type, |
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bytes(self)[field_offset:field_offset + col_length] |
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) |
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except MalformedField as ex: |
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_LOGGER.warning( |
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"Caught %r while instantiating field %d (%d)", |
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ex, col_idx, serial_type |
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) |
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raise MalformedRecord from ex |
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except Exception as ex: |
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_LOGGER.warning( |
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"Caught %r while instantiating field %d (%d)", |
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ex, col_idx, serial_type |
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) |
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# pdb.set_trace() |
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raise |
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self._fields[col_idx] = field_obj |
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col_idx += 1 |
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field_offset += col_length |
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parsed_header_bytes += len(serial_type_varint) |
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header_offset += len(serial_type_varint) |
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if field_offset > len(bytes(self)): |
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raise MalformedRecord |
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# assert(parsed_header_bytes == int(header_length_varint)) |
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def print_fields(self, table=None): |
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for field_idx in self._fields: |
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field_obj = self._fields[field_idx] |
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if not table or table.columns is None: |
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_LOGGER.info( |
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"\tField %d (%d bytes), type %d: %s", |
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field_obj.index, |
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len(field_obj), |
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field_obj.serial_type, |
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field_obj.value |
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) |
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else: |
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_LOGGER.info( |
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"\t%s: %s", |
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table.columns[field_obj.index], |
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field_obj.value |
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) |
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def __repr__(self): |
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return '<Record {} fields, {} bytes, header: {} bytes>'.format( |
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len(self._fields), len(bytes(self)), len(self.header) |
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) |
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mattboyer /
sqbrite
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