[Feature Request] Asynchronous/Asyncio support

[Shivelight]

It would be nice if asynchronous processing natively supported. I think this feature is necessary and reasonably easy to implement without breaking any code or compatibility as we only need to write new API and HTTP client that support async.

If you agree with this or maybe you have a better idea, I would be happy to work on it.

EDIT: I thought I was writing a commit message, here are some sparkles ✨ ✨ ✨

[Shivelight]

I've made my own, closing this as no high interest in it.

[alfredfrancis]

@Shivelight can you merge your solution with this

[Shivelight]

@alfredfrancis I don't think my solution is good to merge with this; it is a duplicate code infused with async-await. I'm not a pro, but in my opinion, a better solution might be architecture change that allows you to use sync and async HTTP client interchangeably. Personally, I like osuapi connectors solution. Whatever the solution is, it's the maintainer decision.

[tokuhirom]

If we're dropping Python 3.6- support in the next major release, we can support async natively.
python.org document says, python 3.5 will become EOL at 2020-09-13. It's very soon :)

Is it time to support async?

[Shivelight]

Is it time to support async?

A yes from me, that would be awesome 🎉

[alfredfrancis]

Is it time to support async?
yes

[uezo]

I've just released aiolinebot, async api client library - strictly saying, not client library but async client generator from line-bot-sdk.

https://github.com/uezo/aiolinebot

This is a kind of hack, but by this way it's easy to keep up-to-date with the API updates until async is officially supported.(very soon?)

I hope this will be help for you and our community😃

[wasdee]

I've just released aiolinebot, async api client library - strictly saying, not client library but async client generator from line-bot-sdk.

uezo/aiolinebot

This is a kind of hack, but by this way it's easy to keep up-to-date with the API updates until async is officially supported.(very soon?)

I hope this will be help for you and our community😃

quoting #310

for those who want a quick solution of webhook part pls use

https://github.com/codustry/line-bot-sdk-python/tree/async-support-for-handler

by pip or poetry add git+https://github.com/codustry/line-bot-sdk-python#async-support-for-handler

handler = WebhookHandlerV2(settings.LINE_SECRET)

@router.post("/line")
async def handle_line_webhook(
        request: Request, 
		signature: str = Header(None, alias="X-Line-Signature")
):
    # get request body as text
    body = await request.body()
    body = body.decode()

    # handle webhook body
    try:
        await handler.handle_async(body, signature)
    except InvalidSignatureError as e:
        print(
                "Invalid signature. Please check your channel access token/channel secret."
        )
        raise e

@handler.add(MessageEvent, message=TextMessage)
async def handle_message(event: MessageEvent):
    response_to_magic_word(event)

This comes from a fastapi framework chatbot.

And a plus that https://github.com/uezo/aiolinebot is fully compatible with https://github.com/codustry/line-bot-sdk-python/tree/async-support-for-handler 🥰

[tokuhirom]

I created new PR #340 to support this feature. If you have any comments on the PR(especially interface), feel free to submit a comment to the PR.