As a result, it is no longer possible to chain promises
(then().then().then(etc.)), but that is actually not an issue for Isso.
The deferred/promise implementation is roughly based on
http://stackoverflow.com/a/17722683 and stackp/promisejs.
Uses keyword arguments to use multiprocessing or uwsgi mixin. This
fixes an issue on exotic *BSDs such as NetBSD where Python comes not
with inter-process semaphores (issue 3307):
mod_wsgi (pid=14365): Target WSGI script '/var/www/vhosts/my.hostname.org/htdocs/isso.wsgi' cannot be loaded as Python module.
mod_wsgi (pid=14365): Exception occurred processing WSGI script '/var/www/vhosts/my.hostname.org/htdocs/isso.wsgi'.
Traceback (most recent call last):
File "/var/www/vhosts/my.hostname.org/htdocs/isso.wsgi", line 8, in <module>
application = make_app(Config.load("/var/www/vhosts/my.hostname.org/htdocs/isso.cfg"))
File "/usr/pkg/lib/python2.7/site-packages/isso/__init__.py", line 155, in make_app
isso = App(conf)
File "/usr/pkg/lib/python2.7/site-packages/isso/__init__.py", line 91, in __init__
super(Isso, self).__init__(conf)
File "/usr/pkg/lib/python2.7/site-packages/isso/core.py", line 223, in __init__
self.lock = multiprocessing.Lock()
File "/usr/pkg/lib/python2.7/multiprocessing/__init__.py", line 175, in Lock
from multiprocessing.synchronize import Lock
File "/usr/pkg/lib/python2.7/multiprocessing/synchronize.py", line 59, in <module>
" function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open implementation, therefore, the required synchronization primitives needed will not function, see issue 3770.
When using Gunicorn or uWSGI to run `isso.dispatch` it would
automatically initialize and a default Isso instance (and cause
several logging messages), although never used.
If you use uWSGI or Gunicorn, you have to change the module from
`isso` to `isso.run`.
The previous approach using a custom X-Custom header did work for the
client-side, but not for activation and deletion links. Now, you need
to add a `name = foo` option to the general section. `isso.dispatch`
then binds this configuration to /foo and can distinguish all API
calls without a special HTTP header.
