Add exception handling for socket mode - BlockingIOError: Resource temporarily unavailable

[tom0010]

This is very similar to #1181.
I'd like to also add another exception handler as I am also frequently getting BlockingIOError which is unnecessary and is filling up logs.
Please see the trace below.

2022-02-18 08:31:57.486 | ERROR    | slack_sdk.socket_mode.builtin.client:_on_error:249 - on_error invoked (session id: 45b057d3-700c-4ea3-a932-ee829cb1f2d8, error: BlockingIOError, message: [Errno 11] Resource temporarily unavailable)Traceback (most recent call last):

  File "/usr/local/lib/python3.9/threading.py", line 930, in _bootstrap
    self._bootstrap_inner()
    │    └ <function Thread._bootstrap_inner at 0x7fb7f5607b80>
    └ <Thread(Thread-1, started daemon 140428008782640)>
  File "/usr/local/lib/python3.9/threading.py", line 973, in _bootstrap_inner
    self.run()
    │    └ <function Thread.run at 0x7fb7f56078b0>
    └ <Thread(Thread-1, started daemon 140428008782640)>
  File "/usr/local/lib/python3.9/threading.py", line 910, in run
    self._target(*self._args, **self._kwargs)
    │    │        │    │        │    └ {}
    │    │        │    │        └ <Thread(Thread-1, started daemon 140428008782640)>
    │    │        │    └ ()
    │    │        └ <Thread(Thread-1, started daemon 140428008782640)>
    │    └ <bound method IntervalRunner._run of <slack_sdk.socket_mode.interval_runner.IntervalRunner object at 0x7fb7f19f8370>>
    └ <Thread(Thread-1, started daemon 140428008782640)>
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/interval_runner.py", line 19, in _run
    self.target()
    │    └ <bound method SocketModeClient._run_current_session of <slack_sdk.socket_mode.builtin.client.SocketModeClient object at 0x7fb...
    └ <slack_sdk.socket_mode.interval_runner.IntervalRunner object at 0x7fb7f19f8370>
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/client.py", line 277, in _run_current_session
    self.current_session.run_until_completion(self.current_session_state)
    │    │               │                    │    └ <slack_sdk.socket_mode.builtin.connection.ConnectionState object at 0x7fb7f1287940>
    │    │               │                    └ <slack_sdk.socket_mode.builtin.client.SocketModeClient object at 0x7fb7f19de730>
    │    │               └ <function Connection.run_until_completion at 0x7fb7f2eae1f0>
    │    └ <slack_sdk.socket_mode.builtin.connection.Connection object at 0x7fb7f1095a30>
    └ <slack_sdk.socket_mode.builtin.client.SocketModeClient object at 0x7fb7f19de730>
> File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/connection.py", line 311, in run_until_completion
    ] = _receive_messages(
        └ <function _receive_messages at 0x7fb7f2ea59d0>
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/internals.py", line 218, in _receive_messages
    return _fetch_messages(
           └ <function _fetch_messages at 0x7fb7f2ea5a60>
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/internals.py", line 241, in _fetch_messages
    remaining_bytes = receive()  # type: ignore
                      └ <function _receive_messages.<locals>.receive at 0x7fb7f0a75b80>
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/internals.py", line 216, in receive
    raise e
  File "/usr/local/lib/python3.9/site-packages/slack_sdk/socket_mode/builtin/internals.py", line 205, in receive
    received_bytes = sock.recv(size)
                     │    │    └ 1024
                     │    └ <function SSLSocket.recv at 0x7fb7f4c61b80>
                     └ <ssl.SSLSocket fd=14, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('172.18.0.3', 55220), raddr=...
  File "/usr/local/lib/python3.9/ssl.py", line 1226, in recv
    return self.read(buflen)
           │    │    └ 1024
           │    └ <function SSLSocket.read at 0x7fb7f4c61430>
           └ <ssl.SSLSocket fd=14, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('172.18.0.3', 55220), raddr=...
  File "/usr/local/lib/python3.9/ssl.py", line 1101, in read
    return self._sslobj.read(len)
           │    │       │    └ 1024
           │    │       └ <method 'read' of '_ssl._SSLSocket' objects>
           │    └ <_ssl._SSLSocket object at 0x7fb7f142d510>
           └ <ssl.SSLSocket fd=14, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('172.18.0.3', 55220), raddr=...

BlockingIOError: [Errno 11] Resource temporarily unavailable
2022-02-18 08:31:57.561 | INFO     | slack_sdk.socket_mode.builtin.connection:disconnect:186 - The connection has been closed (session id: 45b057d3-700c-4ea3-a932-ee829cb1f2d8)

You can see that there is a log message that says the session has been disconnected, which is fine, that's all I need really, I don't need to see the full trace.

Category (place an x in each of the [ ])

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.models (UI component builders)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.scim (SCIM API client)
• slack_sdk.rtm (RTM client)
• slack_sdk.signature (Request Signature Verifier)

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

[seratch]

Hi @tom0010, thanks for the suggestion again!

This is also reasonable. Since the next version, we'll change the logging to print only a single line by default while printing the stack trace only when trace_enabled is True. https://github.com/slackapi/python-slack-sdk/blob/v3.15.0/slack_sdk/socket_mode/builtin/client.py#L250-L253

[tom0010]

Thanks @seratch 👍