Add aiohttp_evicted_sessions to HTTPSessionManager

[cyc60]

What was wrong?

Still receive Unclosed client session messages

Received interrupt signal 2, exiting...
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7fb6d9a86a20>

Disconnect is already implemented.

class ExtendedAsyncBeacon(AsyncBeacon):
    async def disconnect(self) -> None:
        """
        Close aiohttp sessions for provider.
        Got `Unclosed client session` otherwise.
        https://github.com/ethereum/web3.py/issues/3524
        """
        cache = self._request_session_manager.session_cache
        for _, session in cache.items():
            await session.close()
        cache.clear()

Related to Issue #
#3524
Closes #

How was it fixed?

The issue is with evicted sessions — they cannot be force-closed from client code. They remain open for the duration of the request_timeout.

Added aiohttp_evicted_sessions to HTTPSessionManager to track currently open evicted sessions.

Disconnect should now look like this:

async def disconnect(self) -> None:
    """
    Close aiohttp sessions for provider.
    Got `Unclosed client session` otherwise.
    https://github.com/ethereum/web3.py/issues/3524
    """
    cache = self._request_session_manager.session_cache
    for _, session in cache.items():
        await session.close()
    evicted_sessions = self._request_session_manager.aiohttp_evicted_sessions
    for session in evicted_sessions:
        await session.close()
    cache.clear()

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

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