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from zope.component import getAdapter
from zope.component.event import dispatch
from zope.interface import directlyProvides
from webob import Request
from webob.exc import HTTPNotFound
from webob.exc import HTTPUnauthorized
from repoze.bfg.events import NewRequest
from repoze.bfg.events import NewResponse
from repoze.bfg.events import WSGIApplicationCreatedEvent
from repoze.bfg.interfaces import ITraverserFactory
from repoze.bfg.interfaces import IRequest
from repoze.bfg.registry import registry_manager
from repoze.bfg.registry import makeRegistry
from repoze.bfg.security import Unauthorized
from repoze.bfg.view import is_response
from repoze.bfg.view import render_view_to_response
_marker = ()
class Router:
""" WSGI application which routes requests to 'view' code based on
a view registry"""
def __init__(self, root_policy, registry):
self.root_policy = root_policy
self.registry = registry
def __call__(self, environ, start_response):
registry_manager.set(self.registry)
request = Request(environ)
directlyProvides(request, IRequest)
dispatch(NewRequest(request))
root = self.root_policy(environ)
traverser = getAdapter(root, ITraverserFactory)
context, name, subpath = traverser(environ)
request.context = context
request.view_name = name
request.subpath = subpath
try:
response = render_view_to_response(context, request, name,
secure=True)
except Unauthorized, why:
app = HTTPUnauthorized()
app.explanation = str(why)
return app(environ, start_response)
if response is None:
app = HTTPNotFound(request.url)
return app(environ, start_response)
if not is_response(response):
raise ValueError('response did not implement IResponse: %r'
% response)
dispatch(NewResponse(response))
start_response(response.status, response.headerlist)
return response.app_iter
def make_app(root_policy, package=None, filename='configure.zcml',
options=None):
""" Create a view registry based on the application's ZCML. and
return a Router object, representing a ``repoze.bfg`` WSGI
application. ``root_policy`` must be a callable that accepts a
WSGI environment and returns a graph root object. ``package`` is
a Python module representing the application's package,
``filename`` is the filesystem path to a ZCML file (optionally
relative to the package path) that should be parsed to create the
view registry. ``options``, if used, should be a dictionary
containing bfg-specific runtime options, with each key
representing the option and the key's value representing the
specific option value, e.g. ``{'reload_templates':True}``"""
registry = makeRegistry(filename, package, options)
app = Router(root_policy, registry)
try:
registry_manager.set(registry)
dispatch(WSGIApplicationCreatedEvent(app))
finally:
registry_manager.clear()
return app
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