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# Copyright (C) 2011-2014 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import time
from sugar_network.db.metadata import indexed_property, Localized
from sugar_network.db.metadata import Numeric, List, Author, Enum
from sugar_network.db.metadata import Composite, Aggregated
from sugar_network.toolkit.router import ACL
from sugar_network.toolkit import ranges
STATES = ['active', 'deleted']
STATUSES = ['featured']
class Resource(object):
"""Base class for all data classes."""
#: `Metadata` object that describes the document
metadata = None
#: Whether these resources should be migrated from slave-to-master only
one_way = False
def __init__(self, guid, record, origs=None, posts=None):
self.origs = origs or {}
self.posts = posts or {}
self.record = record
self._post_seqno = None
self._guid = guid
@property
def guid(self):
return self._guid or self['guid']
@property
def post_seqno(self):
return self._post_seqno
@post_seqno.setter
def post_seqno(self, value):
if self._post_seqno is None:
self._post_seqno = value
self.post('seqno', value)
@indexed_property(Numeric, slot=1000, prefix='RS', acl=0, default=0)
def seqno(self, value):
return value
@indexed_property(Numeric, slot=1001, prefix='RC', default=0, acl=ACL.READ)
def ctime(self, value):
return value
@indexed_property(Numeric, slot=1002, prefix='RM', default=0, acl=ACL.READ)
def mtime(self, value):
return value
@indexed_property(Author, prefix='RA', default={}, full_text=True,
acl=ACL.READ)
def author(self, value):
return value
@indexed_property(Enum, STATES, prefix='RE', default=STATES[0], acl=0)
def state(self, value):
return value
@indexed_property(List, prefix='RT', full_text=True, default=[])
def tags(self, value):
return value
@indexed_property(List, prefix='RU', default=[], acl=ACL.READ,
subtype=Enum(STATUSES))
def status(self, value):
return value
@indexed_property(List, prefix='RP', default=[],
acl=ACL.READ | ACL.LOCAL)
def pins(self, value):
return value
@property
def exists(self):
return self.record is not None and self.record.consistent
@property
def available(self):
return self.exists and self['state'] != 'deleted'
def created(self):
ts = int(time.time())
self.posts['ctime'] = ts
self.posts['mtime'] = ts
def updated(self):
self.posts['mtime'] = int(time.time())
def get(self, prop, default=None):
"""Get document's property value.
:param prop:
property name to get value
:returns:
`prop` value
"""
value = self.posts.get(prop)
if value is None:
value = self.orig(prop)
if value is None:
value = default
return value
def orig(self, prop):
"""Get document's property original value.
:param prop:
property name to get value
:returns:
`prop` value
"""
prop = self.metadata[prop]
value = self.origs.get(prop.name)
if value is None and self.record is not None:
meta = self.record.get(prop.name)
if meta is not None:
value = meta.get('value')
else:
value = prop.default
self.origs[prop.name] = value
return value
def repr(self, prop):
"""Get property value with applying output typecasts.
Such property values should be used to return property
out from the system.
"""
prop_ = self.metadata[prop]
value = prop_.reprcast(self.get(prop))
if prop_.on_get is not None:
value = prop_.on_get(self, value)
return value
def properties(self, props):
result = {}
for i in props:
result[i] = self.get(i)
return result
def meta(self, prop):
if self.record is not None:
return self.record.get(prop)
def diff(self, r, out_r=None):
patch = {}
for name, prop in self.metadata.items():
if name == 'seqno' or prop.acl & ACL.LOCAL:
continue
meta = self.meta(name)
if meta is None:
continue
seqno = meta.get('seqno')
if not ranges.contains(r, seqno):
continue
if out_r is not None:
ranges.include(out_r, seqno, seqno)
value = meta.get('value')
if isinstance(prop, Aggregated):
value_ = {}
for key, agg in value.items():
agg_seqno = agg.pop('seqno')
if ranges.contains(r, agg_seqno):
value_[key] = agg
if out_r is not None:
ranges.include(out_r, agg_seqno, agg_seqno)
value = value_
patch[name] = {'mtime': meta['mtime'], 'value': value}
return patch
def format_patch(self, props):
if not props:
return {}
patch = {}
for prop, value in props.items():
if self[prop] == value:
continue
orig_value = self[prop]
if orig_value and isinstance(self.metadata[prop], Localized):
for lang, subvalue in value.items():
if orig_value.get(lang) != subvalue:
break
else:
continue
patch[prop] = value
return patch
def post(self, prop, value=None, **meta):
if value is None:
if prop not in self.posts:
return
value = self.posts[prop]
prop = self.metadata[prop]
if prop.on_set is not None:
value = prop.on_set(self, value)
seqno = None
if self.post_seqno and not prop.acl & ACL.LOCAL:
seqno = meta['seqno'] = self.post_seqno
if seqno and isinstance(prop, Aggregated):
for agg in value.values():
agg['seqno'] = seqno
agg['ctime'] = int(time.time())
if isinstance(prop, Composite):
orig_value = self.orig(prop.name)
if orig_value:
orig_value.update(value)
value = orig_value
self.record.set(prop.name, value=value, **meta)
self.posts[prop.name] = value
def __contains__(self, prop):
return prop in self.origs or prop in self.posts
def __getitem__(self, prop):
return self.get(prop)
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