Development Server

Diva comes with a couple of simple shortcuts for running your application using the WSGIServer from the Python standalone library.

Assuming you have an Application subclass (see ApplicationObject), for example:

>>> from diva.core import Application
>>> class MyApp(Application):
...     pass

You can then run that application using the development server as follows, directly from the Python shell:

>>> import logging
>>> from diva.server import serve
>>> serve(MyApp(), log_level=logging.DEBUG)
[INFO] diva.server: Serving <__main__.MyApp object at 0x10f63f0> on 127.0.0.1:8080

Command-Line Interface

It's also simple to enable your application to be run from the command-line, as shown in the following script:

import os
from diva.core import Application
from diva.server import main

class MyApp(Application):
    pass

if __name__ == '__main__':
    main(app)

Now running that script will automatically launch a simple command-line interface complete with options:

$ python myapp.py --help
Usage: myapp.py [options]

Options:
  -h, --help            show this help message and exit
  -O name=value         set a configuration option
  -b HOST, --host=HOST  hostname or IP address to bind to (default 127.0.0.1)
  -p PORT, --port=PORT  port number to listen to (default 8080)
  -r, --auto-reload     automatically restart after code changes (default off)
  -v, --verbose         print as much as possible
  -q, --quiet           print as little as possible

You can use the -O option to set one or more configuration options, overriding any defaults set by the application. For example:

$ python myapp.py -Odebug=false -Ocsrf_protection=false

See ConfigOptions for a list of options made available by the framework, in addition to any custom options your application may support.

Logging

The development server automatically sets up logging for you, with log messages being written to stderr (so they should just show up on the console where you started the server). The verbosity level of the log messages can be controlled with the command-line options --verbose/-v (for debug-level logging) and --quiet/-q (for error-level logging). The default is info-level logging.

If simplejson is installed, the development server also automatically enables FirePHP support for directing request-related log messages to the ​Firebug console in the browser.

Automatic Reloading

When the command-line interface is used, automatic restarting of the server can be enabled using the --auto-reload (or -r) option. This will cause the framework to look for changes to any loaded Python modules, as well as a couple of other files such as routing configuration files and translation catalogs. Whenever a change is detected the complete server process is restarted. Note that this will sometimes cause a short delay until the server is available again.

Applications can add their own files to the list of watched files using the watch_file() function.

API Documentation

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