def handle(changeset):
print ('Received ' + str(changeset))
# Fetch project and pad ids.
project_id = changeset['projectId']
pad_id = changeset['padId']
# Fetch project lock or create it, if not exists already.
if project_id not in update_locks:
update_locks[project_id] = Lock()
update_lock = update_locks[project_id]
with update_lock:
# Fetch next revision number.
if project_id not in revisions:
revisions[project_id] = {}
if pad_id not in revisions[project_id]:
revisions[project_id][pad_id] = [Revision('0', None)]
# Follow the changeset by all revisions not known by that user.
revs = revisions[project_id][pad_id]
apply_from = len(revs)
for i in range(len(revs), 0, -1):
if changeset['baseRev'] == revs[i - 1].id:
apply_from = i
break
for i in range(apply_from, len(revs)):
if changeset['baseLen'] == revs[i].changeset['newLen']:
apply_from = i + 1
break
# Fetch current revision.
crtRev, baseRev = changeset['revId'], changeset['baseRev']
for i in range(apply_from, len(revs)):
changeset = follow(revs[i].changeset, changeset)
# Update base rev.
changeset['baseRev'] = baseRev
# Create new revision out of this changeset.
revisions[project_id][pad_id].append(Revision(crtRev, changeset))
# Update current pad in db.
changeset['projectId'], changeset['padId'] = project_id, pad_id
changeset['revId'] = crtRev
updateDBPad(changeset, crtRev)
# Add the new comments to DB.
if 'comments' in changeset:
for code, comment in changeset['comments'].items():
newComment = Comment(comment['author'], comment['text'])
newComment.pad_id = comment['padId']
newComment.code = comment['code']
db.session.add(newComment)
db.session.commit()
# Include the id of the client that generated the changeset.
changeset['clientId'] = request.sid
# Broadcast to all clients.
emit('server_client_changeset', changeset, room=changeset['projectId'])
# Send ACK to the client.
emit('server_client_ack', changeset['padId'], room=request.sid)
