# -*- coding: utf-8 -*-
from datetime import datetime
import json
import os
import sqlalchemy as sa
from sqlalchemy.sql.expression import text
from utils import datetime2ts, ts2datetime, makefolder
from websocket import trigger_event
import db
import settings
import state
import logging
logger = logging.getLogger(__name__)
def changelog_path():
return os.path.join(settings.data_path, 'peers', '%s.log' % settings.USER_ID)
def next_revision():
settings.server['revision'] = settings.server.get('revision', -1) + 1
return settings.server['revision']
def add_record(action, *args, **kwargs):
if '_ts' in kwargs:
timestamp = kwargs['_ts']
del kwargs['_ts']
else:
timestamp = None
if not timestamp:
timestamp = datetime.utcnow()
timestamp = datetime2ts(timestamp)
revision = next_revision()
data = [revision, timestamp, [action] + list(args)]
data = json.dumps(data, ensure_ascii=False)
path = changelog_path()
if os.path.exists(path):
mode = 'a'
state.changelog_size = os.path.getsize(path)
else:
mode = 'w'
state.changelog_size = 0
makefolder(path)
with open(path, mode) as fd:
fd.write(data + '\n')
state.changelog_size = os.path.getsize(path)
#logger.debug('record change: %s', data)
def changelog_size():
if state.changelog_size is None:
path = changelog_path()
if not os.path.exists(path):
return 0
return os.path.getsize(path)
else:
return state.changelog_size
class Changelog(db.Model):
'''
additem itemid metadata from file (info) + OLID
edititem itemid name->id (i.e. olid-> OL...M)
removeitem itemid
addlist name
editlist name {name: newname}
orderlists [name, name, name]
removelist name
addlistitems listname [ids]
removelistitems listname [ids]
editusername username
editcontact string
addpeer peerid peername
removepeer peerid peername
editpeer peerid {username: string, contact: string}
addannotation itemid data
editannotation itemid annotationid data
removeannotation itemid annotationid
'''
__tablename__ = 'changelog'
id = sa.Column(sa.Integer(), primary_key=True)
created = sa.Column(sa.DateTime())
timestamp = sa.Column(sa.BigInteger())
user_id = sa.Column(sa.String(43))
revision = sa.Column(sa.BigInteger())
data = sa.Column(sa.Text())
sig = sa.Column(sa.String(96))
@classmethod
def record(cls, user, action, *args, **kwargs):
return add_record(action, *args, **kwargs)
@classmethod
def apply_changes(cls, user_, changes, first=False):
from user.models import User
user = user_
trigger = changes
if trigger:
trigger_event('change', {})
if first:
items = set()
lists = {}
peers = set()
for change in changes:
if change[2][0] == 'additem':
items.add(change[2][1])
if change[2][0] == 'addlist':
lists[change[2][1]] = set()
if change[2][0] == 'addlistitems':
if not change[2][1] in lists:
lists[change[2][1]] = set()
for i in change[2][2]:
lists[change[2][1]].add(i)
if change[2][0] == 'addpeer':
peers.add(change[2][1])
for i in user.library.items:
if i.id not in items and user in i.users:
i.users.remove(user)
if i.users:
i.update()
else:
i.delete()
for name in lists:
qs = user.lists.filter_by(name=name)
if qs.count():
l = qs[0]
for i in l.get_items():
if i.id not in lists[name]:
if i.id in l.items:
l.items.remove(i.id)
for peer in User.query:
if user.id in peer.info.get('users', {}) and peer.id not in peers:
del peer.info['users'][user.id]
peer.save()
for change in changes:
if state.shutdown:
return False
if user.id in state.removepeer:
del state.removepeer[user.id]
return False
if not cls.apply_change(user, change, trigger=False):
logger.debug('FAIL %s', change)
trigger = False
break
return False
if trigger:
trigger_event('change', {})
return True
@classmethod
def apply_change(cls, user, change, trigger=True):
revision, timestamp, data = change
last = cls.query.filter_by(user_id=user.id).order_by(text('-revision')).first()
next_revision = last.revision + 1 if last else 0
if revision >= next_revision:
c = cls()
c.created = datetime.utcnow()
c.timestamp = timestamp
c.user_id = user.id
c.revision = revision
c.data = json.dumps(data)
logger.debug('apply change from %s: %s(%s)', user.name, data[0], data[1:])
if getattr(c, 'action_' + data[0])(user, timestamp, *data[1:]):
logger.debug('change applied')
state.db.session.add(c)
state.db.session.commit()
if trigger:
trigger_event('change', {})
return True
else:
logger.debug('could not apply change')
else:
logger.debug('revsion does not match! got %s expecting %s', revision, next_revision)
return False
def __repr__(self):
return self.data
def json(self):
timestamp = self.timestamp or datetime2ts(self.created)
return [self.revision, timestamp, json.loads(self.data)]
def action_additem(self, user, timestamp, itemid, info):
from item.models import Item
i = Item.get(itemid)
if i:
if user not in i.users:
i.add_user(user)
i.update()
else:
i = Item.get_or_create(itemid, info)
i.modified = ts2datetime(timestamp)
if user not in i.users:
i.add_user(user)
i.update()
return True
def action_edititem(self, user, timestamp, itemid, meta):
from user.models import Metadata
m = Metadata.get_or_create(user.id, itemid)
m.edit(meta, modified=ts2datetime(timestamp))
from item.models import Item
i = Item.get(itemid)
if i:
i.sync_metadata()
if state.tasks:
#state.tasks.queue('syncmetadata', [i.id])
state.tasks.queue('getpreview', i.id)
return True
def action_removeitem(self, user, timestamp, itemid):
from item.models import Item
from user.models import Metadata
i = Item.get(itemid)
if i:
if user in i.users:
i.users.remove(user)
if i.users:
i.update()
else:
i.delete()
Metadata.query.filter_by(user_id=user.id, item_id=itemid).delete()
return True
def action_addlist(self, user, timestamp, name, query=None):
from user.models import List
if name == '':
return True
l = List.get_or_create(user.id, name)
trigger_event('addlist', {'id': l.public_id, 'user': user.id})
return True
def action_editlist(self, user, timestamp, name, new):
from user.models import List
l = List.get_or_create(user.id, name)
if 'name' in new:
l.name = new['name']
l.save()
trigger_event('editlist', {'id': l.public_id, 'user': user.id})
return True
def action_orderlists(self, user, timestamp, lists):
from user.models import List
idx = 0
for name in lists:
l = List.get_or_create(user.id, name)
l.index_ = idx
l.save()
idx += 1
trigger_event('orderlists', {'user': user.id})
return True
def action_removelist(self, user, timestamp, name):
from user.models import List
l = List.get(user.id, name)
if l:
l.remove()
trigger_event('removelist', {'id': l.public_id})
return True
def action_addlistitems(self, user, timestamp, name, ids):
from user.models import List
l = List.get_or_create(user.id, name)
l.add_items(ids)
return True
def action_removelistitems(self, user, timestamp, name, ids):
from user.models import List
l = List.get(user.id, name)
if l:
l.remove_items(ids)
return True
def action_editusername(self, user, timestamp, username):
from user.models import List
old = user.nickname
user.info['username'] = username
user.update_name()
if old != user.nickname:
List.rename_user(old, user.nickname)
Changelog.record(state.user(), 'editpeer', self.id, self.json(['username']))
user.save()
return True
def action_editcontact(self, user, timestamp, contact):
if user.info.get('contact') != contact:
user.info['contact'] = contact
user.save()
Changelog.record(state.user(), 'editpeer', user.id, user.json(['contact']))
return True
def action_addpeer(self, user, timestamp, peerid, username):
if len(peerid) == 16:
from user.models import User
if not 'users' in user.info:
user.info['users'] = {}
user.info['users'][peerid] = username
user.save()
peer = User.get_or_create(peerid)
if not 'username' in peer.info:
peer.info['username'] = username
peer.update_name()
peer.save()
return True
def action_removepeer(self, user, timestamp, peerid):
if 'users' in user.info and peerid in user.info['users']:
del user.info['users'][peerid]
user.save()
#fixme, remove from User table if no other connection exists
return True
def action_editpeer(self, user, timestamp, peerid, data):
if len(peerid) == 16:
from user.models import User
peer = User.get_or_create(peerid)
update = False
if not peer.peered:
for key in ('username', 'contact'):
if key in data and peer.info.get(key) != data[key]:
peer.info[key] = data[key]
update = True
if update:
peer.save()
return True
def action_addannotation(self, user, timestamp, itemid, data):
from annotation.models import Annotation
Annotation.create(item_id=itemid, user_id=user.id, data=data)
return True
def action_editannotation(self, user, timestamp, itemid, annotationid, data):
from annotation.models import Annotation
a = Annotation.get(user, itemid, annotationid)
if a:
for key in data:
a.data[key] = data[key]
a.save()
return True
def action_removeannotation(self, user, timestamp, itemid, annotationid):
from annotation.models import Annotation
a = Annotation.get(user, itemid, annotationid)
if a:
a.delete()
return True
@classmethod
def aggregated_changes(cls, since=None, user_id=None):
from item.models import Item
from user.models import List
from user.models import User
if not user_id:
user_id = settings.USER_ID
qs = cls.query.filter_by(user_id=user_id)
qs = Changelog.query.filter_by(user_id=user_id)
if since:
qs = qs.filter(Changelog.revision>=since)
changes = {}
orderlists = False
editcontact = False
editusername = False
for c in qs.order_by('timestamp'):
revision = c.revision
timestamp = c.timestamp
data = json.loads(c.data)
op = data[0]
if op in ('editmeta', 'resetmeta'):
continue
action = changes.setdefault(op, {})
if op == 'additem':
item_id = data[1]
info = data[2]
action[item_id] = [revision, timestamp, info]
if item_id in changes.get('removeitem', []):
del changes['removeitem'][item_id]
i = Item.get(item_id)
if i:
changes.setdefault('edititem', {})[item_id] = [revision+1, timestamp, i.meta]
elif op == 'edititem':
item_id = data[1]
meta = data[2]
if not item_id in action:
action[item_id] = [revision, timestamp, meta]
else:
action[item_id][0] = revision
action[item_id][1] = timestamp
action[item_id][2].update(meta)
elif op == 'removeitem':
item_id = data[1]
if item_id in changes.get('additem', []):
del changes['additem'][item_id]
else:
action[item_id] = [revision, timestamp]
if item_id in changes.get('edititem', []):
del changes['edititem'][item_id]
elif op == 'addlist':
list_id = data[1]
if list_id:
ids = data[2] if len(data) > 2 else []
action[list_id] = [revision, timestamp, ids]
elif op == 'editlist':
old_id = data[1]
new_id = data[2]['name']
r = revision
if old_id not in changes.get('addlist', []):
action[old_id] = [revision, timestamp, {'name': new_id}]
r += 1
for a in ('addlist', 'addlistitems', 'removelistitems'):
if a in changes and old_id in changes[a]:
changes[a][new_id] = changes[a].pop(old_id)
changes[a][new_id][0] = r
elif op == 'orderlists':
orderlists = True
elif op == 'removelist':
list_id = data[1]
if list_id not in changes.get('addlist', []):
action[list_id] = [revision, timestamp]
for a in ('addlist', 'addlistitems', 'removelistitems'):
if a in changes and list_id in changes[a]:
del changes[a][list_id]
elif op == 'addlistitems':
list_id = data[1]
if not list_id:
continue
listitems = data[2]
if list_id not in action:
action[list_id] = [revision, timestamp, []]
action[list_id][0] = revision
action[list_id][1] = timestamp
action[list_id][2] += listitems
#remove from removelistitems!
if list_id in changes.get('remvelistitems', {}):
changes['remvelistitems'][list_id] = [
i for i in changes['remvelistitems'][list_id] if i not in listitems
]
elif op == 'removelistitems':
list_id = data[1]
listitems = data[2]
#remove from additemlists
removed = []
if list_id in changes.get('addlistitems',{}):
removed = [
i for i in changes['addlistitems'][list_id] if i in listitems
]
changes['addlistitems'][list_id] = [
i for i in changes['addlistitems'][list_id] if i not in listitems
]
#remove remaining items
listitems = [
i for i in listitems if i not in removed
]
if listitems:
action[list_id] = [revision, timestamp, listitems]
elif op == 'editusername':
editusername = True
elif op == 'editcontact':
editcontact = True
elif op == 'addpeer':
peer_id = data[1]
username = data[2]
if len(peer_id) == 16:
peer = User.get(peer_id)
if peer:
username = peer.json().get('username', 'anonymous')
action[peer_id] = [revision, timestamp, username]
if peer_id in changes.get('removepeer', []):
del changes['removepeer'][peer_id]
elif op == 'removepeer':
peer_id = data[1]
if peer_id in changes.get('addpeer', []):
del changes['addpeer'][peer_id]
else:
action[peer_id] = [revision, timestamp]
elif op == 'editpeer':
peer_id = data[1]
if not peer_id in action:
peer = User.get(peer_id)
if peer:
data = peer.json(['username', 'contact'])
action[peer_id] = [revision, timestamp, data]
else:
logger.debug('unknonw action %s', data)
_changes = []
for op in list(changes):
if not changes[op]:
del changes[op]
else:
for id in changes[op]:
data = changes[op][id]
rv = data[0]
ts = data[1]
data = [op, id] + data[2:]
_changes.append([rv, ts, data])
_changes.sort(key=lambda change: (change[0], change[1]))
if orderlists:
ids = [l.name for l in List.query.filter_by(user_id=user_id,type='static').order_by('index_') if l.name]
if len(ids) > 1:
_changes.append([-1, timestamp, ['orderlists', ids]])
userinfo = state.user().json()
if editusername:
_changes.append([-1, timestamp, ['editusername', userinfo['username']]])
if editcontact:
_changes.append([-1, timestamp, ['editcontact', userinfo['contact']]])
if _changes:
r = revision
for c in reversed(_changes):
c[0] = r
r -= 1
return _changes