Jan VarhoPython hug with apache mod_wsgi
I found it surprisingly difficult to find a plain explanation of setting up hug and apache mod_wsgi. So here is how I did it.
Minimal hug API
Writing an API with hug is really easy. You can write a "hello world" in four lines of code:
import hug
@hug.get('/hello') def hello(name: str) -> str: return "Hello " + name
Running this on a devserver is also trivial:
hug -f hello.py
mod_wsgi
Setting up mod_wsgi is not too difficult either. You need to install the module and enable it, which on Ubuntu was as easy as:
sudo apt install libapache2-mod-wsgi-py3
Note the 'py3' part, however. I wasted quite a bit of time before realizing the module uses a specific version of Python. Since hug is Python 3 only (a shame), a Python 3 build is needed.
The actual host configuration looks something like:
<VirtualHost *:80> ServerName hello.example.com DocumentRoot /var/www/hello/ WSGIDaemonProcess hello threads=1 WSGIScriptAlias / /var/www/api/hello.py
<Directory /var/www/hello> WSGIProcessGroup hello WSGIApplicationGroup %{GLOBAL} Order deny,allow Allow from all </Directory> </VirtualHost>
(This is on Ubuntu 16.04 with Apache 2.4.18, running it as the Apache user.)
The WSGI script
The WSGI entry point expected by mod_wsgi is named 'application' while hug exposes one under 'hug_wsgi'. There must be some way to change it from the above configuration (how?), but I ended up adding this to hello.py:
application = hug_wsgi
If the application was installed as a package it would be cleaner to have some kind of a separate shi like wsgi.py with just a oneliner:
from mypackage import hug_wsgi as application