def add_object(self, pk, name, value):
''' Create object on server (do not use this function to add
object from a client sync '''
obj = Object(pk=pk, name=name, value=value)
self.counter += 1
obj.lastupdate_counter = self.counter
self.objects.append(obj)
def sync_from_client(self, objects):
result = {}
for sob in objects:
exists = False
conflict = False
for o in self.objects:
if o.guid == sob.guid:
exists = True
o.value = sob.value
o.deleted = sob.deleted
self.counter += 1
o.lastupdate_counter = self.counter
elif o.pk == sob.pk:
# pk conflict: do nothing because this should not occur on server
# client will always sync from server to client first and handle
# any pk conflicts before syncing from client to server
exists = True
conflict = True
result['statuscode'] = NOK
if not exists:
no = Object(pk=sob.pk, name=sob.name, value=sob.value, guid=sob.guid)
no.deleted = sob.deleted
self.counter += 1
no.lastupdate_counter = self.counter
self.objects.append(no)
if 'statuscode' not in result:
result['statuscode'] = OK
result['servercounter'] = self.counter
return result
def add_object(self, pk, name, value):
''' Create object on client (do not use this function to add object from
a server sync) '''
# Check for duplicate primary key
if any(o.pk == pk for o in self.objects):
print "Error creating new object on client {}: primary key {} already in use".format(self.name, pk)
no = Object(pk, name, value)
self.counter += 1
no.lastupdate_counter = self.counter
self.objects.append(no)
def sync_from_server(self):
result = self.server.sync_to_client(self.lastsync_servercounter)
for sob in result['objects']:
exists = False
for o in self.objects:
if o.guid == sob.guid or o.pk == sob.pk:
exists = True
# Handle pk conflict
if o.pk == sob.pk:
o.guid = sob.guid
# Check for conflict (object updated locally since last sync to server)
if o.lastupdate_counter > self.lastsync_counter:
# Decide how to handle conflict
if self.conflict_handling == SERVERPRIORITY:
o.value = sob.value
o.deleted = sob.deleted
elif self.conflict_handling == CLIENTPRIORITY:
''' no change to local object '''
elif self.conflict_handling == TIMESTAMPPRIORITY:
if sob.timestampupdated > o.timestampupdated:
o.value = sob.value
o.deleted = sob.deleted
o.timestampupdated = datetime.now()
else:
# No conflict, update object locally
o.value = sob.value
o.deleted = sob.deleted
if not exists:
no = Object(sob.pk, sob.name, sob.value, sob.guid)
no.deleted = sob.deleted
no.lastupdate_counter = self.counter
self.objects.append(no)
if result['statuscode'] == OK:
self.lastsync_servercounter = result['servercounter']
