FastAPI - wkhtmltopdf
Hi there - I have a FastAPI server that requires wkhtmltopdf to run. I added an Aptfile to my repo but it doesn't seem to be getting picked up Railway. Any tips? Thanks!!
33 Replies
Project ID:
a460e728-9647-40f6-811c-fe5d99abb663a460e728-9647-40f6-811c-fe5d99abb663
I've added it as an environment variable: NIXPACKS_APT_PKGS yet it still errors when running (it is there but does not run properly).
I have also tried to do it in the railway.json
Here is the actual error that shows up when endpoint is pinged:
/bin/wkhtmltopdf: /nix/store/wprxx5zkkk13hpj6k1v6qadjylh3vq9m-gcc-11.3.0-lib/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /lib/x86_64-linux-gnu/libQt5WebKit.so.5)
INFO: 192.168.0.2:43880 - "GET / HTTP/1.1" 200 OK
could you undo everything you have tried and then give me the error again? you may have made things worse
haha oops! Let's do it again
Okay, so when I don't do anything with the Aptfile, etc it of course shows no wkhtmltopdf exists (OSError: No wkhtmltopdf executable found: "b''")
When I add an environment variable for NIXPACKS_APT_PKGS with value wkhtmltopdf, I see that it is being installed in the build logs which is a good sign. This is the error I get starting from where it's relevant
pdf_bytes = pdfkit.from_string(html, False)
File "/opt/venv/lib/python3.8/site-packages/pdfkit/api.py", line 75, in from_string
return r.to_pdf(output_path)
File "/opt/venv/lib/python3.8/site-packages/pdfkit/pdfkit.py", line 201, in to_pdf
self.handle_error(exit_code, stderr)
File "/opt/venv/lib/python3.8/site-packages/pdfkit/pdfkit.py", line 158, in handle_error
raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(exit_code, error_msg))
OSError: wkhtmltopdf exited with non-zero code 1. error:
/bin/wkhtmltopdf: /nix/store/wprxx5zkkk13hpj6k1v6qadjylh3vq9m-gcc-11.3.0-lib/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /lib/x86_64-linux-gnu/libQt5WebKit.so.5)
please remove any attempts you are making at installing wkhtmltopdf yourself, and then show me the error
Sorry, I'm not quite sure what you mean? When I don't have it anywhere in my code, the error is as shown above: OSError: No wkhtmltopdf executable found: "b''"
remove any aptfiles and NIXPACKS_APT_PKGS
Yep, all done
in this you mention NIXPACKS_APT_PKGS with value wkhtmltopdf, if you remove this variable do you still get the same error
im looking for the error before you started trying to fix this yourself
Sorry, let me clarify...it builds properly yes but when I actually test my app it just says wkhtmltopdf doesn't exist
If you look at the most recent error in the deploy logs you can see it
maybe there is some confusion here, i cant access your project at all
thats why im asking for you to provide me with the error before you started trying to fix it yourself
pdf_bytes = pdfkit.from_string(html, False)
File "/opt/venv/lib/python3.8/site-packages/pdfkit/api.py", line 72, in from_string
r = PDFKit(input, 'string', options=options, toc=toc, cover=cover, css=css,
File "/opt/venv/lib/python3.8/site-packages/pdfkit/pdfkit.py", line 45, in init
self.configuration = (Configuration() if configuration is None
File "/opt/venv/lib/python3.8/site-packages/pdfkit/configuration.py", line 38, in init
raise IOError('No wkhtmltopdf executable found: "%s"\n'
OSError: No wkhtmltopdf executable found: "b''"
If this file exists please check that this process can read it or you can pass path to it manually in method call, check README. Otherwise please install wkhtmltopdf - https://github.com/JazzCore/python-pdfkit/wiki/Installing-wkhtmltopdf
GitHub
Installing wkhtmltopdf
Wkhtmltopdf python wrapper to convert html to pdf. Contribute to JazzCore/python-pdfkit development by creating an account on GitHub.
So this is the error when the package doesn't exist at all
This is what the app was at before I tried fixing it myself
there we go, thats what im asking for
Sorry about that!
add this as a
nixpacks.toml file to your project
untested of course, so i am not fully sure this would workLet's give it a shot!
There we go! Works beautifully!
You are the best, thanks!
no problem, glad i could help š
Hey there, Hoping someone can help me out - the problem doesn't seem to be the same but it's related to the same package (pdfkit / wkhtmltopdf)
I'm running a FastAPI application on Railway and I'm using PDFKit to convert templated HTML files to pds, which are attached to emails that I send out to my users when they purchase a ticket
I'm having a strange issue, and can't really debug any further because the package is not throwing any errors
On localhost, the application works as expected.
On the production environment, the pdf is created but the formatting is all wrong
-----
1. Template HTML File
2. Output on localhost:
3. Output from production:
----
Relevant code:
Railway logs:
---
As you can see, there are no errors thrown, and the app continues to send the email with the badly formatted pdf
Not sure if this is related or not, but previously I was getting the following error log on production:
This seems to actually be two separate issues, but the issue went away when I added a file volume to my production deployment within Railway dashboard. (I searched for
QPainter::begin(): Returned false and someone suggested that it could be due to a writing to disk issue)
The file volume has made these errors go away - but I can't help but feel like theres something weird going on with the config for the underlying binaries
I'm way in over my head with this - my devops experience is very limited (hence why I am using Railway). I hope someone can help!
Thank you ā¤ļø
@Brody tagging you because you seemed to be very on it with the previous threadwell first off, your html template file has 37 validation errors according to https://validator.w3.org/#validate_by_upload
did you use the nixpacks.toml file i sent above?
speedy response, appreciated.
The html template is a slightly modified exported version from SendGrid's designer (https://docs.sendgrid.com/ui/sending-email/editor)
I'll check the validation issues but it's strange that it worked just fine on my local - and the html file also compiles fine if you run it in a live server from VSCode / open it in chrome
Design & Code Editor
Twilio SendGrid Marketing Campaigns' editing gives you complete control over your emails. Use a flexible drag-and-drop Design editor or a robust HTML code editor.
Yup, first thing I did was add the nixpacks.toml file - before I even tried merging to master
maybe adding fontconfig will help?
makes sense, let me give that a go
didn't do the trick im afraid. I added fontconfig but the file is the same with the weird left-formatting, no images, etc. (no changes to the fonts either)
What should I look out for in the build logs to make sure that these binaries were installed properly?
check the build table at the top of the build logs
looks like it did work
(im suspecting that the issue is in fact with the html file so I'll try again tomorrow morning with a fresh template)
Will report back, nonetheless I massively appreciate your speedy support ā¤ļø
no problem!