chat_postMessage/chat_update: The read operation timed out (occasionally)

[stokedout]

I'm starting to see the occasional "The read operation timed out" when create/updating messages in production. Just wondering if you have seen this before and whether you had any pointers of what to look at. First thought is the size of the request being sent could be it.

say/chat_postMessage

Traceback (most recent call last):
  File "/app/oauth_app/slack_helpers.py", line 27, in toggle_loading_reaction
    handle_event()
  File "/app/oauth_app/register_slack_listeners.py", line 130, in <lambda>
    lambda: handle_event(
            ^^^^^^^^^^^^^
  File "/app/oauth_app/event_handlers/message_event_broker.py", line 137, in message_event_broker
    handle_event(
  File "/app/oauth_app/roles_required.py", line 25, in wrapper
    return handle_event(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/oauth_app/event_handlers/default_message_event_handler.py", line 257, in handle_event
    say(
  File "/app/oauth_app/say_logger.py", line 12, in wrapper
    said = say(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_bolt/context/say/say.py", line 60, in __call__
    return self.client.chat_postMessage(  # type: ignore[union-attr]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/client.py", line 2764, in chat_postMessage
    return self.api_call("chat.postMessage", json=kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 169, in api_call
    return self._sync_send(api_url=api_url, req_args=req_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 200, in _sync_send
    return self._urllib_api_call(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 307, in _urllib_api_call
    response = self._perform_urllib_http_request(url=url, args=request_args)  # type: ignore[arg-type]
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 511, in _perform_urllib_http_request
    raise err
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 410, in _perform_urllib_http_request
    resp = self._perform_urllib_http_request_internal(url, req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 540, in _perform_urllib_http_request_internal
    resp = urlopen(req, context=self.ssl, timeout=self.timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 519, in open
    response = self._open(req, data)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 536, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 496, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 1391, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 1352, in do_open
    r = h.getresponse()
        ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/http/client.py", line 1395, in getresponse
    response.begin()
  File "/usr/local/lib/python3.11/http/client.py", line 325, in begin
    version, status, reason = self._read_status()
                              ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/http/client.py", line 286, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/socket.py", line 718, in readinto
    return self._sock.recv_into(b)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 1314, in recv_into
    return self.read(nbytes, buffer)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 1166, in read
    return self._sslobj.read(len, buffer)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TimeoutError: The read operation timed out

chat_update

Traceback (most recent call last):
  File "/app/oauth_app/slack_helpers.py", line 27, in toggle_loading_reaction
    handle_event()
  File "/app/oauth_app/register_slack_listeners.py", line 130, in <lambda>
    lambda: handle_event(
            ^^^^^^^^^^^^^
  File "/app/oauth_app/event_handlers/message_event_broker.py", line 137, in message_event_broker
    handle_event(
  File "/app/oauth_app/roles_required.py", line 25, in wrapper
    return handle_event(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/oauth_app/event_handlers/default_message_event_handler.py", line 482, in handle_event
    client.chat_update(
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/client.py", line 2886, in chat_update
    return self.api_call("chat.update", json=kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 169, in api_call
    return self._sync_send(api_url=api_url, req_args=req_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 200, in _sync_send
    return self._urllib_api_call(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 307, in _urllib_api_call
    response = self._perform_urllib_http_request(url=url, args=request_args)  # type: ignore[arg-type]
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 511, in _perform_urllib_http_request
    raise err
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 410, in _perform_urllib_http_request
    resp = self._perform_urllib_http_request_internal(url, req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/slack_sdk/web/base_client.py", line 540, in _perform_urllib_http_request_internal
    resp = urlopen(req, context=self.ssl, timeout=self.timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 519, in open
    response = self._open(req, data)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 536, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 496, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 1391, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/urllib/request.py", line 1352, in do_open
    r = h.getresponse()
        ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/http/client.py", line 1395, in getresponse
    response.begin()
  File "/usr/local/lib/python3.11/http/client.py", line 325, in begin
    version, status, reason = self._read_status()
                              ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/http/client.py", line 286, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/socket.py", line 718, in readinto
    return self._sock.recv_into(b)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 1314, in recv_into
    return self.read(nbytes, buffer)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 1166, in read
    return self._sslobj.read(len, buffer)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TimeoutError: The read operation timed out

[hello-ashleyintech]

Hi, @stokedout! Thanks so much for your question 😄

Just to clarify based on the stack trace - are you using Socket Mode or HTTP request urls for your production app?