SQLite objects created in a thread can only be used in that same thread.

Hi @lemon24

Thanks for making this library.

I am attempting to utilise it for a Telegram bot I am working on. However, I run into the following error:

SQLite objects created in a thread can only be used in that same thread.

Here is my code 😃

Doing some quick Google searching I might need to do something similar to what is recommended in this stack overflow post.

However, I cannot see a way I can provide this to the library currently.

Hope you can help. Thanks and a merry Christmas to you! 🎄

[dbrennand]

Hi @lemon24

This looks awesome! Hopefully I’ll have some time soon to test this out for my bot. Also thanks for the suggestion issue as well 🙂👍🏻

[lemon24]

Hi @dbrennand, starting with reader 2.15, it is now possible to use a reader object from multiple threads; docs.

It should now be possible to have a global Reader object in bot.py. So, instead of this:

async def add_feeds(update, context):
    with contextlib.closing(r.make_reader(READER_DB_PATH)) as reader:
        ... # do stuff with reader

… you can now do this, which should be a bit more ergonomic:

async def add_feeds(update, context):
    with reader:
        ... # do stuff with reader

reader = r.make_reader(READER_DB_PATH)

Some notes:

• You still have to use the Reader as a context manager. It is not possible to just use it from another thread because I still haven’t figured out a way of reliably running cleanup code on thread exit; the context manager ensures reliable cleanup.
• You can only do with reader: ... once per thread; this might improve in the future.