On 12/27/18 6:05 PM, Danny Blaker wrote: > we're building an app for the council where users fill in a form, then > we generate a PDF (containing a page of text), and users get a > download link on the homepage. > we expect many users to submit forms concurrently. > > I see 2 approaches: > > 1. Generate in the view as per documentation > : https://docs.djangoproject.com/en/2.1/howto/outputting-pdf/ > 2. Use a seperate script to generate PDF and use django > api https://www.django-rest-framework.org/api-guide/parsers/#fileuploadparser > > However, to handle concurrency we'll also need a broker - like > rabbitMQ + Celery > > Is there a "best practice" way to approach this, or has anyone had > experience with generating PDFs in django and can recommend an approach? > > Thanks!! > > resources: > > https://realpython.com/asynchronous-tasks-with-django-and-celery/ > https://simpleisbetterthancomplex.com/tutorial/2017/08/20/how-to-use-celery-with-django.html#why-should-i-use-celery > > > Best way is relative.
Simplified we do the following: * Use Django Templates to create a HTML page. * Save the HTML output as a file. * Use subprocess to call wkhtmltopdf to convert the HTML file to PDF file. * Return a PDF response using the saved PDF file It works, not sure if it is the fastest way, we see about a 4-5 sec response time. As some of the generated PDF files can be reused we actually keep the PDF file on disk and reuse them for other recurring requests. This bypasses the generation of PDF file bring the response time back to 1 sec. By using Celery you don't have an exact time of when a PDF will be generated. There are several commercial applications available to generate PDF's which might be much faster but for us the open source application works fine. wkhtmltopdf: https://wkhtmltopdf.org/ -- *Peter van der Does o: ***410-584-2500**** m: 732-425-3102 *ONeil Interactive, Inc * oneilinteractive.com <http://www.oneilinteractive.com/> ** -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/6c65e73e-2b68-3e10-0efe-51ba99042d15%40oneilinteractive.com. For more options, visit https://groups.google.com/d/optout.
