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163 lines (136 loc) · 6.01 KB
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from .. import mappings
from .filtering import FilterableMetaclass
from future.utils import with_metaclass
from datetime import datetime, timedelta
import time
# The interval to reload volatile properties
volatile_refresh_timeout = timedelta(seconds=15)
class Property:
def __init__(self, mutable=False, identifier=False, volatile=False, relationship=None, \
derived_class=None, is_datetime=False, filterable=False):
self.mutable = mutable
self.identifier = identifier
self.volatile = volatile
self.relationship = relationship
self.derived_class = derived_class
self.is_datetime = is_datetime
self.filterable = filterable
class MappedObject:
def __init__(self, **vals):
self._expand_vals(self.__dict__, **vals)
def _expand_vals(self, target, **vals):
for v in vals:
if type(vals[v]) is dict:
vals[v] = MappedObject(**vals[v])
elif type(vals[v]) is list:
# oh mama
vals[v] = [ MappedObject(**i) if type(i) is dict else i for i in vals[v] ]
target.update(vals)
def __repr__(self):
return "Mapping containing {}".format(vars(self).keys())
class Base(object, with_metaclass(FilterableMetaclass)):
"""
The Base class knows how to look up api properties of a model, and lazy-load them.
"""
properties = {}
def __init__(self, client, id):
self._set('_populated', False)
self._set('_last_updated', datetime.min)
self._set('_client', client)
for prop in type(self).properties:
self._set(prop, None)
self._set('id', id)
def __getattribute__(self, name):
if name in type(self).properties.keys():
if type(self).properties[name].identifier:
pass # don't load identifiers from the server, we have those
elif (object.__getattribute__(self, name) is None and not self._populated \
or type(self).properties[name].derived_class) \
or (type(self).properties[name].volatile \
and object.__getattribute__(self, '_last_updated')
+ volatile_refresh_timeout < datetime.now()):
if type(self).properties[name].derived_class:
#load derived object(s)
self._set(name, type(self).properties[name].derived_class
._api_get_derived(self, getattr(self, '_client')))
else:
self._api_get()
return object.__getattribute__(self, name)
def __repr__(self):
return "{}: {}".format(type(self).__name__, self.id)
def __setattr__(self, name, value):
if name in type(self).properties.keys() and not type(self).properties[name].mutable:
raise AttributeError("'{}' is not a mutable field of '{}'"
.format(name, type(self).__name__))
self._set(name, value)
def save(self):
resp = self._client.put(type(self).api_endpoint, model=self,
data=self._serialize())
if 'error' in resp:
return False
return True
def delete(self):
resp = self._client.delete(type(self).api_endpoint, model=self)
if 'error' in resp:
return False
self.invalidate()
return True
def invalidate(self):
for key in (k for k in type(self).properties.keys()
if not type(self).properties[k].identifier):
self._set(key, None)
self._populated = False
def _serialize(self):
return { a: getattr(self, a) for a in type(self).properties
if type(self).properties[a].mutable }
def _api_get(self):
json = self._client.get(type(self).api_endpoint, model=self)
self._populate(json)
def _populate(self, json):
if not json:
return
for key in json:
if key in (k for k in type(self).properties.keys()
if not type(self).properties[k].identifier):
if type(self).properties[key].relationship \
and not json[key] is None:
if isinstance(json[key], list):
objs = []
for d in json[key]:
if not 'id' in d:
continue
obj = mappings.make(d['id'], getattr(self,'_client'),
cls=type(self).properties[key].relationship)
if obj:
obj._populate(d)
objs.append(obj)
self._set(key, objs)
else:
if not 'id' in json[key]:
continue
obj = mappings.make(json[key]['id'], getattr(self,'_client'),
cls=type(self).properties[key].relationship)
if obj:
obj._populate(json[key])
self._set(key, obj)
elif type(json[key]) is dict:
self._set(key, MappedObject(**json[key]))
elif type(json[key]) is list:
mapping = MappedObject(_list=json[key])
self._set(key, mapping._list)
elif type(self).properties[key].is_datetime:
try:
t = time.strptime(json[key], "%Y-%m-%dT%H:%M:%S")
self._set(key, datetime.fromtimestamp(time.mktime(t)))
except:
#TODO - handle this better (or log it?)
self._set(key, json[key])
else:
self._set(key, json[key])
self._set('_populated', True)
self._set('_last_updated', datetime.now())
def _set(self, name, value):
object.__setattr__(self, name, value)
@classmethod
def api_list(cls):
return '/'.join(cls.api_endpoint.split('/')[:-1])