| 1 | # lognestmonster Copyright (c) 2019 Joshua 'joshuas3' Stockin |
| 2 | # <https://github.com/JoshuaS3/lognestmonster/>. |
| 3 |
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| 4 |
|
| 5 | # This file is part of lognestmonster. |
| 6 |
|
| 7 | # lognestmonster is free software: you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation, either version 3 of the License, or |
| 10 | # (at your option) any later version. |
| 11 |
|
| 12 | # lognestmonster is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 |
|
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with lognestmonster. If not, see <https://www.gnu.org/licenses/>. |
| 19 |
|
| 20 | import struct |
| 21 | import os |
| 22 |
|
| 23 | STATEMENT_START = 0 |
| 24 | STATEMENT_END = 1 |
| 25 | EVENT_START = 2 |
| 26 | EVENT_END = 3 |
| 27 |
|
| 28 | def ulonglong(bytestr): |
| 29 | return struct.unpack("@Q", bytestr)[0] |
| 30 | def uchar(charv): |
| 31 | return struct.unpack("@B", charv)[0] |
| 32 | def ushort(shortv): |
| 33 | return struct.unpack("@H", shortv)[0] |
| 34 |
|
| 35 |
|
| 36 | class NestableProto: |
| 37 | parent = None |
| 38 |
|
| 39 | class NestProto: |
| 40 | pushed = [] |
| 41 |
|
| 42 | class StatementProto(NestableProto): |
| 43 | verbosity = 0 |
| 44 | timestamp = 0 |
| 45 | pos = 0 |
| 46 | def __init__(self): |
| 47 | self.verbosity = 0 |
| 48 | self.timestamp = 0 |
| 49 | self.pos = 0 |
| 50 | self.parent = None |
| 51 | self.pushed = [] |
| 52 |
|
| 53 | class EventProto(NestProto, NestableProto): |
| 54 | def __init__(self): |
| 55 | self.parent = None |
| 56 | self.pushed = [] |
| 57 |
|
| 58 |
|
| 59 | class Reader: |
| 60 | fd = None |
| 61 |
|
| 62 | version = 0 |
| 63 | timestamp = 0 |
| 64 |
|
| 65 | objects = {} |
| 66 |
|
| 67 | event_count = 0 |
| 68 | statement_count = 0 |
| 69 |
|
| 70 | file_size = 0 |
| 71 | position = 0 |
| 72 |
|
| 73 | def __init__(self, fd): |
| 74 | self.fd = fd |
| 75 |
|
| 76 | self.version = 0 |
| 77 | self.timestamp = 0 |
| 78 |
|
| 79 | self.objects = {} # key = position in file, value = True for statement, False for event |
| 80 |
|
| 81 | self.event_count = 0 |
| 82 | self.statement_count = 0 |
| 83 |
|
| 84 | self.file_size = 0 |
| 85 | self.position = 0 |
| 86 |
|
| 87 | self.size() |
| 88 | self.scan() |
| 89 |
|
| 90 | def size(): |
| 91 | self.fd.seek(0, os.SEEK_END) # go to end of file and get position |
| 92 | newsize = self.fd.tell() |
| 93 | self.fd.seek(self.position) # return to previous position |
| 94 |
|
| 95 | diff = self.file_size - newsize |
| 96 | self.file_size = newsize |
| 97 | return diff > 0 |
| 98 |
|
| 99 | def scan(): # scan for events and statements from self.position to the end of file |
| 100 | if self.position == 0: # if it's the start of the file, grab version and timestamp |
| 101 | version_byte = self.fd.read(1) |
| 102 | self.version = uchar(version_byte) |
| 103 | timestamp_bytes = self.fd.read(8) |
| 104 | self.timestamp = ulonglong(timestamp_bytes) |
| 105 | self.position = self.fd.tell() |
| 106 |
|
| 107 | current_statement = None |
| 108 | current_event = None |
| 109 | if self.position < self.file_size: |
| 110 | self.objects[self.position:self.file_size] = None |
| 111 | while self.position < self.file_size: |
| 112 | pass |
| 113 |
|
| 114 |
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