def handle(client_message, handle_event_imap_invalidation=None, handle_event_imap_batch_invalidation=None, to_object=None):
    """ Event handler """
    message_type = client_message.get_message_type()
    if message_type == EVENT_IMAPINVALIDATION and handle_event_imap_invalidation is not None:
        key = None
        if not client_message.read_bool():
            key = client_message.read_data()
        handle_event_imap_invalidation(key=key)
    if message_type == EVENT_IMAPBATCHINVALIDATION and handle_event_imap_batch_invalidation is not None:
        keys_size = client_message.read_int()
        keys = []
        for _ in range(0, keys_size):
            keys_item = client_message.read_data()
            keys.append(keys_item)
        handle_event_imap_batch_invalidation(keys=keys)
Event handler