class RetryCal:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
try:
session = Session()
retries = Retry(total=5, backoff_factor=2,
status_forcelist=[500, 502, 503, 504])
session.mount('https://', HTTPAdapter(max_retries=retries))
request.retry_session = session
except Exception as e:
raise e
response = self.get_response(request)
try:
if isinstance(response, HttpResponseServerError):
# Handle your custom response here if needed
pass
except (ProtocolError, OSError) as err:
raise ConnectionError(err, request)
return response
On Wed, Jan 24, 2024 at 12:29 PM 'Amitesh Sahay' via Django users <
django-users@googlegroups.com> wrote:
> Hi All,
>
> I have written a *custom Django middleware* to do* retries and catch
> exception* if there is *any connection related issues* between two
> servers. *Below is the code snippet.*
>
> from requests.adapters import Retry, RetryError, HTTPAdapter,
> MaxRetryError, ConnectTimeoutError, ProtocolError, ResponseError
> from requests.sessions import Session
> from django.http import HttpResponseServerError
>
>
> class RetryCal:
> def __init__(self, get_response):
> self.get_response = get_response
>
> @staticmethod
> def process_request(request):
> try:
> session = Session()
> retries = Retry(total=5, backoff_factor=2,
> status_forcelist=[500, 502, 503, 504])
> session.mount('https://', HTTPAdapter(max_retries=retries))
> request.retry_session = session
>
> except Exception as e:
> raise e
>
> def __call__(self, request):
> RetryCal.process_request(request)
> try:
> response = self.get_response(request)
> return response
>
> except (ProtocolError, OSError) as err:
> raise ConnectionError(err, request)
>
> except MaxRetryError as e:
> if isinstance(e.reson, ConnectTimeoutError):
> return HttpResponseServerError("Connection timeout
> error...")
> if isinstance(e.reson, ResponseError):
> raise RetryError(e, request=request)
>
> raise ConnectionError(e, request)
>
>
> *Below is the placement of the custom middleware*
>
> *'django.middleware.security.SecurityMiddleware',*
> *'django.contrib.sessions.middleware.SessionMiddleware',*
>
> *# custom retry middleware.*
> *'integ.api_retry_custom_middleware.RetryCal',*
>
> below this custom middleware I do have other default one's as well.
>
> The problem is I am not sure if this is working. I have an access token,
> In that I added some garbage characters and tried to hit my endpoint. *I
> did see an exception as seen below*
>
> *Internal Server Error: /api/acct/*
> *[24/Jan/2024 14:23:39] "GET /api/acct/ HTTP/1.1" 500 5348*
>
> But I can see this error even if I comment out my custom middleware. My
> purpose is to create the custom middleware and if there is any API request
> from any Django App the request should go first through the custom
> middleware. That is my thought. But I am not sure if the middleware is
> working. Or maybe the placement if the custom middleware is not proper. I
> have been working with Django for a while now but written the custom
> middleware for the first time.
>
> Please suggest.
>
>
>
> Regards,
> Amitesh
>
> --
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> https://groups.google.com/d/msgid/django-users/304829749.259529.1706099335383%40mail.yahoo.com
> <https://groups.google.com/d/msgid/django-users/304829749.259529.1706099335383%40mail.yahoo.com?utm_medium=email&utm_source=footer>
> .
>
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