feat: #1276 add Asyncio SQLAlchemy support

[galuszkak]

Summary

Add support for Asyncio SQLAlchemy Installation and StateStore

Testing

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[seratch]

Left a few comments; Also, it seems the tests fail even for supported Python runtime versions. Could you check the issue?

[galuszkak]

@seratch will look into that probably today. The problem is that my tests are passing, it just something happens later in tests that they are braking - I think it's somehow related to retrieving asyncio loop by std library.

[galuszkak]

I've identified the source of the test failures @seratch. The original async_test helper created a single event loop and set it globally, which was the core of the problem. unittest.IsolatedAsyncioTestCase uses an asyncio runner that closes the event loop in its finally block. This meant that tests after the first were trying to use an already closed loop. By changing async_test to generate a new loop for each test, the problem is solved, and all tests are passing in the latest Python versions. This fix works because, while the decorator creates a new loop, the runner's finally block was closing the previously set loop, leading to the RuntimeError: There is no current event loop in thread 'MainThread'.

I assume I have to still rework this to make it work with Python 3.6 and 3.7 so in the end I will revert that - but it was nice to find root cause of this.

[galuszkak]

I've tested locally now with support from Python 3.6/3.7

Testing with Python 3.7 I got

855 passed, 5 skipped, 23 warnings in 239.12s (0:03:59)

On my M1 Macbook.