Python


Smooth when warmed.
Sluggish if served cold.

Serving Python


At first glance...
  1. Python Native Web Server
  2. Application Container/Wrapper

Common Containers

  • CGI
  • Apache + mod_python
  • FastCGI
  • Apache + mod_wsgi
  • uWSGI


http://docs.python.org/2/howto/webservers.html

WSGI


Web Server Gateway Interface

WSGI was created as a low-level interface between web servers and web applications or frameworks to promote common ground for portable web application development.

The Two Sides of WSGI


The WSGI has two sides: the "server" or "gateway" side, and the "application" or "framework" side.

WSGI middleware implements both sides of the API so that it can 
intermediate between a WSGI server and a WSGI application performing  utility functions:

  • Routing a request to different application objects based on the target URL.
  • Allowing multiple applications or frameworks to run side-by-side in the same process
  • Load balancing and remote processing, by forwarding requests and responses over a network
  • Perform content postprocessing.

WTH is uWSGI Then?


The uWSGI project aims at developing a full stack for building hosting services. Application servers (for various programming languages and protocols), proxies, process managers and monitors are all implemented using a common api and a common configuration style. Thanks to its pluggable architecture it can be extended to support more platforms and languages.

Currently, you can write plugins in C, C++ and Objective-C.
The “WSGI” part in the name is a tribute to the namesake Python standard, as it has been the first developed plugin for the project.
Versatility, performance, low-resource usage and reliability are the strengths of the project (and the only rules followed).

Invocation

$ service myserver start | stop | status

/etc/init/myserver.conf
start on runlevel [2345]
stop on runlevel [016]
respawn

pre-start script
	NUM_PROC=`nproc`
	NUM_PROC=`expr $NUM_PROC \* 4`
end script

script
	exec /usr/local/bin/uwsgi -s ws.sock -M -p $NUM_PROC -b 12288 -C 600 --pythonpath /myproject/ --wsgi-file /myproject/wsgi.py --gid www-data --uid www-data --need-app --stats 127.0.0.1:30001 --log-x-forwarded-for --memory-report --reload-on-rss 1024 --logger syslog:uwsgi-ws -l 1024end script

Request Handling



Advanced Routing


Source

https://github.com/unbit/uwsgi


Documentation

https://uwsgi-docs.readthedocs.org/en/latest/

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