When not using container IP: urllib.error.URLError, Cannot assign requested address>

[darknight-007]

eb_1 | Internal Server Error: /webclient/get_overlayed_combined_image/4
web_1 | Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 1318, in do_open
web_1 | encode_chunked=req.has_header('Transfer-encoding'))
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 1239, in request
web_1 | self._send_request(method, url, body, headers, encode_chunked)
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 1285, in _send_request
web_1 | self.endheaders(body, encode_chunked=encode_chunked)
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 1234, in endheaders
web_1 | self._send_output(message_body, encode_chunked=encode_chunked)
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 1026, in _send_output
web_1 | self.send(msg)
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 964, in send
web_1 | self.connect()
web_1 | File "/usr/local/lib/python3.6/http/client.py", line 936, in connect
web_1 | (self.host,self.port), self.timeout, self.source_address)
web_1 | File "/usr/local/lib/python3.6/socket.py", line 724, in create_connection
web_1 | raise err
web_1 | File "/usr/local/lib/python3.6/socket.py", line 713, in create_connection
web_1 | sock.connect(sa)
web_1 | OSError: [Errno 99] Cannot assign requested address
web_1 |
web_1 | During handling of the above exception, another exception occurred:
web_1 |
web_1 | Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 35, in inner
web_1 | response = get_response(request)
web_1 | File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 128, in _get_response
web_1 | response = self.process_exception_by_middleware(e, request)
web_1 | File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
web_1 | response = wrapped_callback(request, *callback_args, **callback_kwargs)
web_1 | File "/usr/local/lib/python3.6/site-packages/django/views/decorators/http.py", line 40, in inner
web_1 | return func(request, *args, **kwargs)
web_1 | File "/app/webclient/views.py", line 532, in get_overlayed_combined_image
web_1 | background = PILImage.open(urlopen(url))
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 223, in urlopen
web_1 | return opener.open(url, data, timeout)
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 526, in open
web_1 | response = self._open(req, data)
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 544, in _open
web_1 | '_open', req)
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 504, in _call_chain
web_1 | result = func(*args)
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 1346, in http_open
web_1 | return self.do_open(http.client.HTTPConnection, req)
web_1 | File "/usr/local/lib/python3.6/urllib/request.py", line 1320, in do_open
web_1 | raise URLError(err)
web_1 | urllib.error.URLError: <urlopen error [Errno 99] Cannot assign requested address>
web_1 | [10/Jun/2018 16:31:17] "GET /webclient/get_overlayed_combined_image/4 HTTP/1.1" 500 142665

[darknight-007]

Using the IP assigned to the host instead of loopback or 0.0.0.0 seems to resolve this issue.

[darknight-007]

using host IP doesn't solve the issue. @CassieMai and I tested on digitalocean node

[darknight-007]

Sometimes manifests as following (likely because the foreground image blob is somehow corrupted?). I initially thought this was a CSRF issue, but didn't see any evidence of that. The other cause for this overall issue could be how admin view is configured. Could it simply be an urls.py issue?

Environment:

Request Method: GET
Request URL: http://162.243.207.90:8000/webclient/get_overlayed_combined_image/4

Django Version: 2.0.6
Python Version: 3.6.5
Installed Applications:
['webclient.apps.WebclientConfig',
'django.contrib.admin.apps.SimpleAdminConfig',
'adminplus',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django_extensions']
Installed Middleware:
['django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.security.SecurityMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.6/site-packages/django/views/decorators/csrf.py" in wrapped_view
54. return view_func(*args, **kwargs)

File "/app/webclient/views.py" in get_overlayed_combined_image
534. background.paste(foreground, (0, 0), foreground)

File "/usr/local/lib/python3.6/site-packages/PIL/Image.py" in paste
1406. self.im.paste(im, box, mask.im)

Exception Type: ValueError at /webclient/get_overlayed_combined_image/4
Exception Value: bad transparency mask

[CassieMai]

Hello, @darknight-007 . How do you debug in django? I would like to look over intermediate variables in agdss/webclient/view.py. Do you have any idea?