/usr/lib/python3/dist-packages/imagekit/registry.py is in python3-django-imagekit 4.0.2-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | from .exceptions import AlreadyRegistered, NotRegistered
from .signals import content_required, existence_required, source_saved
from .utils import autodiscover, call_strategy_method
class GeneratorRegistry(object):
"""
An object for registering generators. This registry provides
a convenient way for a distributable app to define default generators
without locking the users of the app into it.
"""
def __init__(self):
self._generators = {}
content_required.connect(self.content_required_receiver)
existence_required.connect(self.existence_required_receiver)
def register(self, id, generator):
registered_generator = self._generators.get(id)
if registered_generator and generator != self._generators[id]:
raise AlreadyRegistered('The generator with id %s is'
' already registered' % id)
self._generators[id] = generator
def unregister(self, id):
try:
del self._generators[id]
except KeyError:
raise NotRegistered('The generator with id %s is not'
' registered' % id)
def get(self, id, **kwargs):
autodiscover()
try:
generator = self._generators[id]
except KeyError:
raise NotRegistered('The generator with id %s is not'
' registered' % id)
if callable(generator):
return generator(**kwargs)
else:
return generator
def get_ids(self):
autodiscover()
return self._generators.keys()
def content_required_receiver(self, sender, file, **kwargs):
self._receive(file, 'on_content_required')
def existence_required_receiver(self, sender, file, **kwargs):
self._receive(file, 'on_existence_required')
def _receive(self, file, callback):
generator = file.generator
# FIXME: I guess this means you can't register functions?
if generator.__class__ in self._generators.values():
# Only invoke the strategy method for registered generators.
call_strategy_method(file, callback)
class SourceGroupRegistry(object):
"""
The source group registry is responsible for listening to source_* signals
on source groups, and relaying them to the image generated file strategies
of the appropriate generators.
In addition, registering a new source group also registers its generated
files with that registry.
"""
_signals = {
source_saved: 'on_source_saved',
}
def __init__(self):
self._source_groups = {}
for signal in self._signals.keys():
signal.connect(self.source_group_receiver)
def register(self, generator_id, source_group):
from .specs.sourcegroups import SourceGroupFilesGenerator
generator_ids = self._source_groups.setdefault(source_group, set())
generator_ids.add(generator_id)
cachefile_registry.register(generator_id,
SourceGroupFilesGenerator(source_group, generator_id))
def unregister(self, generator_id, source_group):
from .specs.sourcegroups import SourceGroupFilesGenerator
generator_ids = self._source_groups.setdefault(source_group, set())
if generator_id in generator_ids:
generator_ids.remove(generator_id)
cachefile_registry.unregister(generator_id,
SourceGroupFilesGenerator(source_group, generator_id))
def source_group_receiver(self, sender, source, signal, **kwargs):
"""
Relay source group signals to the appropriate spec strategy.
"""
from .cachefiles import ImageCacheFile
source_group = sender
# Ignore signals from unregistered groups.
if source_group not in self._source_groups:
return
specs = [generator_registry.get(id, source=source) for id in
self._source_groups[source_group]]
callback_name = self._signals[signal]
for spec in specs:
file = ImageCacheFile(spec)
call_strategy_method(file, callback_name)
class CacheFileRegistry(object):
"""
An object for registering generated files with image generators. The two are
associated with each other via a string id. We do this (as opposed to
associating them directly by, for example, putting a ``cachefiles``
attribute on image generators) so that image generators can be overridden
without losing the associated files. That way, a distributable app can
define its own generators without locking the users of the app into it.
"""
def __init__(self):
self._cachefiles = {}
def register(self, generator_id, cachefiles):
"""
Associates generated files with a generator id
"""
if cachefiles not in self._cachefiles:
self._cachefiles[cachefiles] = set()
self._cachefiles[cachefiles].add(generator_id)
def unregister(self, generator_id, cachefiles):
"""
Disassociates generated files with a generator id
"""
try:
self._cachefiles[cachefiles].remove(generator_id)
except KeyError:
pass
def get(self, generator_id):
for k, v in self._cachefiles.items():
if generator_id in v:
for file in k():
yield file
class Register(object):
"""
Register generators and generated files.
"""
def generator(self, id, generator=None):
if generator is None:
# Return a decorator
def decorator(cls):
self.generator(id, cls)
return cls
return decorator
generator_registry.register(id, generator)
# iterable that returns kwargs or callable that returns iterable of kwargs
def cachefiles(self, generator_id, cachefiles):
cachefile_registry.register(generator_id, cachefiles)
def source_group(self, generator_id, source_group):
source_group_registry.register(generator_id, source_group)
class Unregister(object):
"""
Unregister generators and generated files.
"""
def generator(self, id):
generator_registry.unregister(id)
def cachefiles(self, generator_id, cachefiles):
cachefile_registry.unregister(generator_id, cachefiles)
def source_group(self, generator_id, source_group):
source_group_registry.unregister(generator_id, source_group)
generator_registry = GeneratorRegistry()
cachefile_registry = CacheFileRegistry()
source_group_registry = SourceGroupRegistry()
register = Register()
unregister = Unregister()
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