docs: def push(self, id):
          "Sends a message to the specified connection (id)"
          conn = session['connections'].get(id, None)
          if conn:
              msgs = simplejson.loads(request.body)
              for msg in msgs:
                  try:
                      cmd = msg.pop(0).upper()
                      assert ' ' not in cmd, "Bad message"
                      if cmd in ('USER', ):
                          sufix = " :"+msg.pop()
                      else:
                          sufix = ''
                      assert not [i for i in msg if ' ' in i], "Bad message"
  
                      print 'PUSH:', (cmd, msg, sufix)
  
                      if msg:
                          payload = "%s %s%s\r\n" % (cmd, ' '.join(msg), sufix)
                      else:
                          payload = "%s%s\r\n" % (cmd, sufix)
                      yield request.environ['cogen.call'](conn.sock.sendall)(
                              payload.encode('utf-8'))
                      if isinstance(request.environ['cogen.wsgi'].result, Exception):
                          yield simplejson.dumps(('', 'ERROR', str(e)))
                      else:
                          yield simplejson.dumps(('', 'PUSH_OK', ''))
                  except Exception, e:
                      yield simplejson.dumps(('', 'ERROR', str(e)))
          else:
              yield simplejson.dumps(('', 'ERROR', 'Invalid connection id.'))