get_chats() does not work as expected.

[asarubbo]

Hello, I noticed this behavior more that once.

I have a group that sends ~1000 messages per day, where in each message there is an image, so it takes a while to synchronize.

The original code was:

tg.login()

result_get_chats = tg.get_chats()
result_get_chats.wait()
if result_get_chats.error:
    print(f'get chats error: {result_get_chats.error_info}')

def new_message_handler(update):
    ....

tg.add_message_handler(new_message_handler)
tg.idle()
tg.stop()

And with this code, when I launch a bot (after e.g. 2 days that I wasn't use it), it fails to synchronize the messages in a short time interval and then it behaves like that messages are received in real time.

I added also a time.sleep(30) before def new_message_handler(update) but it does not improve.

How to be sure that get_chats() works as expected and fetches everything before start to work? Basically result_get_chats.wait() should do the job but it doesn't.

To reproduce, I think you need to setup a bot, make a login, then shutdown and fill a group with thousand of messages/photos and then start again the bot.

[alexander-akhmetov]

Hi,

I suspect that you’ll need to use getChatHistory (reference) to properly load all messages.

[asarubbo]

I see that the current limit for get_chats() is 100.

Do you think that overwrite the limit could help?

[alexander-akhmetov]

From what I understand from the documentation, I think you still need to use getChatHistory to load messages in the chats individually. But I’m not very familiar with how it works, so I could be wrong about that.

[mervick]

The getChats method in TDLib is used to retrieve chat IDs and does not load chat messages.
The message handler you added retrieves only new messages and does not load older ones. To load old messages, you should first use the getChatHistory method before adding your message handler.