This file is indexed.

/usr/lib/python2.7/dist-packages/trytond/cache.py is in tryton-server 3.8.3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
# This file is part of Tryton.  The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
from threading import Lock
from collections import OrderedDict

from sql import Table
from sql.functions import CurrentTimestamp

from trytond.transaction import Transaction

__all__ = ['Cache', 'LRUDict']


def freeze(o):
    if isinstance(o, (set, tuple, list)):
        return tuple(freeze(x) for x in o)
    elif isinstance(o, dict):
        return frozenset((x, freeze(y)) for x, y in o.iteritems())
    else:
        return o


class Cache(object):
    """
    A key value LRU cache with size limit.
    """
    _cache_instance = []
    _resets = {}
    _resets_lock = Lock()

    def __init__(self, name, size_limit=1024, context=True):
        self.size_limit = size_limit
        self.context = context
        self._cache = {}
        self._cache_instance.append(self)
        self._name = name
        self._timestamp = None
        self._lock = Lock()

    def _key(self, key):
        if self.context:
            return (key, Transaction().user, freeze(Transaction().context))
        return key

    def get(self, key, default=None):
        cursor = Transaction().cursor
        key = self._key(key)
        with self._lock:
            cache = self._cache.setdefault(cursor.dbname,
                LRUDict(self.size_limit))
            try:
                result = cache[key] = cache.pop(key)
                return result
            except (KeyError, TypeError):
                return default

    def set(self, key, value):
        cursor = Transaction().cursor
        key = self._key(key)
        with self._lock:
            cache = self._cache.setdefault(cursor.dbname,
                LRUDict(self.size_limit))
            try:
                cache[key] = value
            except TypeError:
                pass
        return value

    def clear(self):
        cursor = Transaction().cursor
        Cache.reset(cursor.dbname, self._name)
        with self._lock:
            self._cache[cursor.dbname] = LRUDict(self.size_limit)

    @staticmethod
    def clean(dbname):
        with Transaction().new_cursor():
            cursor = Transaction().cursor
            table = Table('ir_cache')
            cursor.execute(*table.select(table.timestamp, table.name))
            timestamps = {}
            for timestamp, name in cursor.fetchall():
                timestamps[name] = timestamp
        for inst in Cache._cache_instance:
            if inst._name in timestamps:
                with inst._lock:
                    if (not inst._timestamp
                            or timestamps[inst._name] > inst._timestamp):
                        inst._timestamp = timestamps[inst._name]
                        inst._cache[dbname] = LRUDict(inst.size_limit)

    @staticmethod
    def reset(dbname, name):
        with Cache._resets_lock:
            Cache._resets.setdefault(dbname, set())
            Cache._resets[dbname].add(name)

    @staticmethod
    def resets(dbname):
        with Transaction().new_cursor():
            cursor = Transaction().cursor
            table = Table('ir_cache')
            with Cache._resets_lock:
                Cache._resets.setdefault(dbname, set())
                for name in Cache._resets[dbname]:
                    cursor.execute(*table.select(table.name,
                            where=table.name == name))
                    if cursor.fetchone():
                        # It would be better to insert only
                        cursor.execute(*table.update([table.timestamp],
                                [CurrentTimestamp()],
                                where=table.name == name))
                    else:
                        cursor.execute(*table.insert(
                                [table.timestamp, table.name],
                                [[CurrentTimestamp(), name]]))
                Cache._resets[dbname].clear()
            cursor.commit()

    @classmethod
    def drop(cls, dbname):
        for inst in cls._cache_instance:
            inst._cache.pop(dbname, None)


class LRUDict(OrderedDict):
    """
    Dictionary with a size limit.
    If size limit is reached, it will remove the first added items.
    """
    def __init__(self, size_limit, *args, **kwargs):
        assert size_limit > 0
        self.size_limit = size_limit
        super(LRUDict, self).__init__(*args, **kwargs)
        self._check_size_limit()

    def __setitem__(self, key, value):
        super(LRUDict, self).__setitem__(key, value)
        self._check_size_limit()

    def update(self, *args, **kwargs):
        super(LRUDict, self).update(*args, **kwargs)
        self._check_size_limit()

    def setdefault(self, key, default=None):
        default = super(LRUDict, self).setdefault(key, default=default)
        self._check_size_limit()
        return default

    def _check_size_limit(self):
        while len(self) > self.size_limit:
            self.popitem(last=False)