Error spewed by connection failure

[artmg]

The root cause of this issue is likely to be insignificant. However that the error spews such a great deal of detail into the logs means that we should try and catch exceptions like these, and at best output a single line INFO or WARN message.

2020-01-06 19:53:36 ERROR (MainThread) [homeassistant.helpers.entity] Update for climate.kitchen fails
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 157, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw
  File "/usr/local/lib/python3.7/site-packages/urllib3/util/connection.py", line 61, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "/usr/local/lib/python3.7/socket.py", line 748, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -3] Try again

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 672, in urlopen
    chunked=chunked,
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 376, in _make_request
    self._validate_conn(conn)
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 994, in _validate_conn
    conn.connect()
  File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 334, in connect
    conn = self._new_conn()
  File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 169, in _new_conn
    self, "Failed to establish a new connection: %s" % e
urllib3.exceptions.NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x7f8268b144d0>: Failed to establish a new connection: [Errno -3] Try again

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 720, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/usr/local/lib/python3.7/site-packages/urllib3/util/retry.py", line 436, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='apil.warmup.com', port=443): Max retries exceeded with url: /graphql (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f8268b144d0>: Failed to establish a new connection: [Errno -3] Try again'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 281, in async_update_ha_state
    await self.async_device_update()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 461, in async_device_update
    await self.hass.async_add_executor_job(self.update)
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/config/custom_components/warmup/climate.py", line 264, in update
    self._client.update()
  File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 240, in wrapper
    result = method(*args, **kwargs)
  File "/config/custom_components/warmup/climate.py", line 132, in update
    self._warmup.update_all_devices()
  File "/config/custom_components/warmup/warmup4ie/warmup4ie.py", line 202, in update_all_devices
    response = requests.post(url=self.URL, headers=header_with_token, json=body)
  File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 116, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='apil.warmup.com', port=443): Max retries exceeded with url: /graphql (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f8268b144d0>: Failed to establish a new connection: [Errno -3] Try again'))
2020-01-06 19:55:34 ERROR (MainThread) [homeassistant.components.rest.switch] Error while fetching data: None
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/rest/switch.py", line 196, in async_update
    await self.get_device_state(self.hass)
  File "/usr/src/homeassistant/homeassistant/components/rest/switch.py", line 208, in get_device_state
    self._resource, auth=self._auth, headers=self._headers
  File "/usr/local/lib/python3.7/site-packages/aiohttp/client.py", line 504, in _request
    await resp.start(conn)
  File "/usr/local/lib/python3.7/site-packages/aiohttp/client_reqrep.py", line 847, in start
    message, payload = await self._protocol.read()  # type: ignore  # noqa
  File "/usr/local/lib/python3.7/site-packages/aiohttp/streams.py", line 591, in read
    await self._waiter
aiohttp.client_exceptions.ServerDisconnectedError: None

Unfortunately I do not have an adequate set of steps to reproduce the issue, so I'm not sure how to test this.