from threading      import Lock

msg_lock = Lock()
media_group_ignore = set()

with shelve.open('lineDB') as db:
    app = Client("user", apiId, apiHash)

    @app.on_message(Filters.channel & ~Filters.edited)
    def lineBot(Client, message):
                    msg_lock.acquire()
                    if msg.media_group_id:
                        if msg.media_group_id in media_group_ignore:
                            return False
                        else:
                            media_group = []
                            for media in app.iter_history(msg.chat.id, limit=10):
                                if msg.media_group_id == media.media_group_id:
                                    caption = f'{msg.chat.title}\n{media.caption}' if media.caption else msg.chat.title
                                    if media.photo:
                                        media_group.append(InputMediaPhoto(media=media.photo.file_id, file_ref=media.photo.file_ref, caption=caption))
                                    elif media.video:
                                        media_group.append(InputMediaVideo(media=media.video.file_id, file_ref=media.video.file_ref, caption=caption))

                            print('send')
                            send(app, msg, msg_id, line, media_group, spam_chan)
                            media_group = []
                            media_group_ignore.add(msg.media_group_id)
                            print(msg.chat.id, msg.message_id, media_group_ignore, msg.media_group_id)

                        if len(media_group_ignore) > 20: media_group_ignore.clear()
                    else:
                        send(app, msg, msg_id, line, msg_txt, spam_chan)
                    msg_lock.release()