Current File : //proc/227033/root/opt/alt/python27/lib/python2.7/site-packages/paste/recursive.pyc
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Middleware to make internal requests and forward requests internally.
When applied, several keys are added to the environment that will allow
you to trigger recursive redirects and forwards.
paste.recursive.include:
When you call
``environ['paste.recursive.include'](new_path_info)`` a response
will be returned. The response has a ``body`` attribute, a
``status`` attribute, and a ``headers`` attribute.
paste.recursive.script_name:
The ``SCRIPT_NAME`` at the point that recursive lives. Only
paths underneath this path can be redirected to.
paste.recursive.old_path_info:
A list of previous ``PATH_INFO`` values from previous redirects.
Raise ``ForwardRequestException(new_path_info)`` to do a forward
(aborting the current request).
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A WSGI middleware that allows for recursive and forwarded calls.
All these calls go to the same 'application', but presumably that
application acts differently with different URLs. The forwarded
URLs must be relative to this container.
Interface is entirely through the ``paste.recursive.forward`` and
``paste.recursive.include`` environmental keys.
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Used to signal that a request should be forwarded to a different location.
``url``
The URL to forward to starting with a ``/`` and relative to
``RecursiveMiddleware``. URL fragments can also contain query strings
so ``/error?code=404`` would be a valid URL fragment.
``environ``
An altertative WSGI environment dictionary to use for the forwarded
request. If specified is used *instead* of the ``url_fragment``
``factory``
If specifed ``factory`` is used instead of ``url`` or ``environ``.
``factory`` is a callable that takes a WSGI application object
as the first argument and returns an initialised WSGI middleware
which can alter the forwarded response.
Basic usage (must have ``RecursiveMiddleware`` present) :
.. code-block:: python
from paste.recursive import ForwardRequestException
def app(environ, start_response):
if environ['PATH_INFO'] == '/hello':
start_response("200 OK", [('Content-type', 'text/plain')])
return ['Hello World!']
elif environ['PATH_INFO'] == '/error':
start_response("404 Not Found", [('Content-type', 'text/plain')])
return ['Page not found']
else:
raise ForwardRequestException('/error')
from paste.recursive import RecursiveMiddleware
app = RecursiveMiddleware(app)
If you ran this application and visited ``/hello`` you would get a
``Hello World!`` message. If you ran the application and visited
``/not_found`` a ``ForwardRequestException`` would be raised and the caught
by the ``RecursiveMiddleware``. The ``RecursiveMiddleware`` would then
return the headers and response from the ``/error`` URL but would display
a ``404 Not found`` status message.
You could also specify an ``environ`` dictionary instead of a url. Using
the same example as before:
.. code-block:: python
def app(environ, start_response):
... same as previous example ...
else:
new_environ = environ.copy()
new_environ['PATH_INFO'] = '/error'
raise ForwardRequestException(environ=new_environ)
Finally, if you want complete control over every aspect of the forward you
can specify a middleware factory. For example to keep the old status code
but use the headers and resposne body from the forwarded response you might
do this:
.. code-block:: python
from paste.recursive import ForwardRequestException
from paste.recursive import RecursiveMiddleware
from paste.errordocument import StatusKeeper
def app(environ, start_response):
if environ['PATH_INFO'] == '/hello':
start_response("200 OK", [('Content-type', 'text/plain')])
return ['Hello World!']
elif environ['PATH_INFO'] == '/error':
start_response("404 Not Found", [('Content-type', 'text/plain')])
return ['Page not found']
else:
def factory(app):
return StatusKeeper(app, status='404 Not Found', url='/error')
raise ForwardRequestException(factory=factory)
app = RecursiveMiddleware(app)
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`extra_environ` is an optional dictionary that is also added
to the forwarded request. E.g., ``{'HTTP_HOST': 'new.host'}``
could be used to forward to a different virtual host.
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The forwarder will try to restart the request, except with
the new `path` (replacing ``PATH_INFO`` in the request).
It must not be called after and headers have been returned.
It returns an iterator that must be returned back up the call
stack, so it must be used like:
.. code-block:: python
return environ['paste.recursive.forward'](path)
Meaningful transformations cannot be done, since headers are
sent directly to the server and cannot be inspected or
rewritten.
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Starts another request with the given path and adding or
overwriting any values in the `extra_environ` dictionary.
Returns an IncludeResponse object.
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Like Includer, but just stores the app_iter response
(be sure to call close on the response!)
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