async def join_group(p: Profile, g: Group, sender: AbstractMessageSender):
members = await g.get_members()
await g.user_join(p.ident)
await p.set_prop(PROFILE_GROUP_KEY, g.ident)
tr = await p.get_translator()
message = tr.myg_notification_joined_group(p.get_username())
send_message_to_group_members(members, message, sender)
async def leave_group(p: Profile, g: Group, sender: AbstractMessageSender):
await g.user_leave(p.ident)
await p.del_prop(PROFILE_GROUP_KEY)
tr = await p.get_translator()
members = await g.get_members()
if members:
message = tr.myg_notification_left_group(p.get_username())
send_message_to_group_members(members, message, sender)
else:
await g.remove()
