df7594a105
Import in `ready` method of kfet app config of `kfet.forms` may be annoying because it starts executing `__init__` methods of fields. Causing failures if these methods does DB calls, as `ready` may be called before applying migrations.
114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
import math
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import json
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from django.core.cache import cache
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from django.core.serializers.json import DjangoJSONEncoder
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from channels.channel import Group
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from channels.generic.websockets import JsonWebsocketConsumer
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def to_ukf(balance, is_cof=False):
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"""Convert euro to UKF."""
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from .config import kfet_config
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subvention = kfet_config.subvention_cof
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grant = (1 + subvention / 100) if is_cof else 1
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return math.floor(balance * 10 * grant)
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# Storage
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class CachedMixin:
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"""Object with cached properties.
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Attributes:
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cached (dict): Keys are cached properties. Associated value is the
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returned default by getters in case the key is missing from cache.
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cache_prefix (str): Used to prefix keys in cache.
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"""
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cached = {}
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cache_prefix = ''
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def __init__(self, cache_prefix=None, *args, **kwargs):
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super().__init__(*args, **kwargs)
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if cache_prefix is not None:
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self.cache_prefix = cache_prefix
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def cachekey(self, attr):
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return '{}__{}'.format(self.cache_prefix, attr)
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def __getattr__(self, attr):
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if attr in self.cached:
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return cache.get(self.cachekey(attr), self.cached.get(attr))
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elif hasattr(super(), '__getattr__'):
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return super().__getattr__(attr)
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else:
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raise AttributeError("can't get attribute")
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def __setattr__(self, attr, value):
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if attr in self.cached:
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cache.set(self.cachekey(attr), value)
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elif hasattr(super(), '__setattr__'):
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super().__setattr__(attr, value)
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else:
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raise AttributeError("can't set attribute")
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def clear_cache(self):
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cache.delete_many([
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self.cachekey(attr) for attr in self.cached.keys()
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])
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# Consumers
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class DjangoJsonWebsocketConsumer(JsonWebsocketConsumer):
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"""Custom Json Websocket Consumer.
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Encode to JSON with DjangoJSONEncoder.
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"""
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@classmethod
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def encode_json(cls, content):
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return json.dumps(content, cls=DjangoJSONEncoder)
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class PermConsumerMixin:
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"""Add support to check permissions on consumers.
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Attributes:
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perms_connect (list): Required permissions to connect to this
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consumer.
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message.user is appended as argument to each connection_groups method call.
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"""
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http_user = True # Enable message.user
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perms_connect = []
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def connect(self, message, **kwargs):
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"""Check permissions on connection."""
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if message.user.has_perms(self.perms_connect):
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super().connect(message, **kwargs)
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else:
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self.close()
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def raw_connect(self, message, **kwargs):
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# Same as original raw_connect method of JsonWebsocketConsumer
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# We add user to connection_groups call.
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groups = self.connection_groups(user=message.user, **kwargs)
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for group in groups:
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Group(group, channel_layer=message.channel_layer).add(message.reply_channel)
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self.connect(message, **kwargs)
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def raw_disconnect(self, message, **kwargs):
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# Same as original raw_connect method of JsonWebsocketConsumer
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# We add user to connection_groups call.
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groups = self.connection_groups(user=message.user, **kwargs)
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for group in groups:
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Group(group, channel_layer=message.channel_layer).discard(message.reply_channel)
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self.disconnect(message, **kwargs)
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def connection_groups(self, user, **kwargs):
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"""`message.user` is available as `user` arg. Original behavior."""
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return super().connection_groups(user=user, **kwargs)
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