Hi, I need to convert HTML templates to PDFs in Django. I have a perfect solution that works on my PC (pdfkit/wkhtmltopdf) however this requires the installation of an external dependency software wkhtmltopdf and pythonanywhere doesn't allow the installation of any libraries/dependencies outside of pip.
I was wondering if there is a workaround to this issue?
wkhtmltopdf is already installed on PythonAnywhere.
Oh that's awesome. When I try to execute my code is get this error however:
My Code:
varand
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posts
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glenn
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9498
posts
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PythonAnywhere staff
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template = get_template('receipts/template1.html')
context = {
"invoice_id": 123,
"customer_name": "John Cooper",
"amount": 1399.99,
"today": "Today",
}
html = template.render(context)
pdf = pdfkit.from_string(html, False)
response = HttpResponse(pdf, content_type='application/pdf')
return response
ERROR:
raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(exit_code, stderr))
OSError: wkhtmltopdf exited with non-zero code -6. error:
QXcbConnection: Could not connect to display
**NO MATCH**
Hi, you need a virtualization feature enabled (I've just done it for you) and you should probably use Display() from pyvirtualdisplay -- please check this thread: https://www.pythonanywhere.com/forums/topic/2012/#id_post_90138.
Thanks! Now I'm getting
OSError: wkhtmltopdf exited with non-zero code -11. error:
Loading page (1/2)
[> ] 0%#015[======> ] 10%#015[==============================> ] 50%#015[============================================================] 100%#015
There was an article stating that this might be due to lack of memory because of a large HTML file, but for testing my HTML file is only:
<p>test</p>
What does the code that you are currently using look like?
Like this:
@action(detail=False, methods=['GET'])
def generate(self, request, **kwargs):
template = get_template('receipts/template1.html')
context = {
"invoice_id": 123,
"customer_name": "John Cooper",
"amount": 1399.99,
"today": "Today",
}
html = template.render(context)
disp = Display().start()
pdf = pdfkit.from_string(html, False)
disp.stop()
response = HttpResponse(pdf, content_type='application/pdf')
return response
.
@action(detail=False, methods=['GET'])
def generate(self, request, **kwargs):
template = get_template('receipts/template1.html')
context = {
"invoice_id": 123,
"customer_name": "John Cooper",
"amount": 1399.99,
"today": "Today",
}
html = template.render(context)
disp = Display().start()
pdf = pdfkit.from_string(html, False)
disp.stop()
response = HttpResponse(pdf, content_type='application/pdf')
return response
[edit by admin: formatting]
I'd suggest using the with pattern with the Display object so that it gets cleared down properly if there's an error in that call to from_string:
:::python
with Display():
pdf = pdfkit.from_string(html, False)
-- possibly previous runs have left some rogue processes running and your code is unable to start new ones. I'll take a look and post back here.
There was a virtual display running in an un-closeable state on the server, so I've cleared that down. Could you try again now, using the with pattern?
My code now:
serializer_class = InputSerializer
authentication_classes = (TokenAuthentication,)
permission_classes = (AllowAny,)
@action(detail=False, methods=['GET'])
def generate(self, request, **kwargs):
template = get_template('receipts/template1.html')
context = {
"invoice_id": 123,
"customer_name": "John Cooper",
"amount": 1399.99,
"today": "Today",
}
html = template.render(context)
with Display():
pdf = pdfkit.from_string(html, False)
response = HttpResponse(pdf, content_type='application/pdf')
return response
The error:
Traceback (most recent call last):
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/core/handlers/base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/viewsets.py", line 125, in view
return self.dispatch(request, *args, **kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/home/varand/Intrude/tools_api/views.py", line 418, in generate
pdf = pdfkit.from_string(html, False)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/pdfkit/api.py", line 72, in from_string
return r.to_pdf(output_path)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/pdfkit/pdfkit.py", line 159, in to_pdf
raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(exit_code, stderr))
OSError: wkhtmltopdf exited with non-zero code -11. error:
Loading page (1/2)
[> ] 0%#015[======> ] 10%#015[==============================> ] 50%#015[============================================================] 100%#015
I simplified my code even more to isolate the issue.
@action(detail=False, methods=['GET'])
def generate(self, request, **kwargs):
with Display():
pdf = pdfkit.from_string('<p>Hi</p>', False)
return Response(status=status.HTTP_200_OK)
Still the same error.
Could you send the traceback from the simplified code?
Sure here it is:
Traceback (most recent call last):
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/core/handlers/base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/viewsets.py", line 125, in view
return self.dispatch(request, *args, **kwargs)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/home/varand/Intrude/tools_api/views.py", line 410, in generate
pdf = pdfkit.from_string('<p>Hi</p>', False)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/pdfkit/api.py", line 72, in from_string
return r.to_pdf(output_path)
File "/home/varand/.virtualenvs/intrudevenv/lib/python3.8/site-packages/pdfkit/pdfkit.py", line 159, in to_pdf
raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(exit_code, stderr))
OSError: wkhtmltopdf exited with non-zero code -11. error:
Loading page (1/2)
[> ] 0%#015[======> ] 10%#015[==============================> ] 50%#015[============================================================] 100%#015
Sorry about that. It looks like the new virtualisation system was not enabled for your account. I have enabled it now, so try reload your web app and see if that changes anything.
Finally, it's working! Thank you both for your help :)
Thanks for confirming!
