def start_chat(conn, username, trans=None):
"""first part of message interchange for starting a one-to-one
conversation"""
user = ConnectedUser.__users__.get(username)
sender = conn.data['user']
if sender is user:
conn.send(UserError.startchat_cannot_chat_with_yourself(), trans)
return
chat = Chat()
def callback(accepted):
if accepted:
conn.send(UserOk.startchat_accepted(chat.id, sender.db_tuple.name, username), trans)
else:
sender.exitChat(chat)
conn.send(UserOk.startchat_not_accepted(), trans)
if user is not None:
sender.enterChat(chat)
user.callIntoChat(sender, chat.id, callback)
else:
conn.send(UserError.user_not_connected(), trans)
