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from zope.interface import implements
from zope.interface import providedBy
from zope.interface import alsoProvides
from repoze.bfg.interfaces import IForbiddenView
from repoze.bfg.interfaces import IDebugLogger
from repoze.bfg.interfaces import INotFoundView
from repoze.bfg.interfaces import IRootFactory
from repoze.bfg.interfaces import IRouter
from repoze.bfg.interfaces import IRouteRequest
from repoze.bfg.interfaces import IRoutesMapper
from repoze.bfg.interfaces import ISettings
from repoze.bfg.interfaces import ITraverser
from repoze.bfg.interfaces import IView
from repoze.bfg.configuration import make_app # b/c import
from repoze.bfg.events import AfterTraversal
from repoze.bfg.events import NewRequest
from repoze.bfg.events import NewResponse
from repoze.bfg.exceptions import Forbidden
from repoze.bfg.exceptions import NotFound
from repoze.bfg.request import Request
from repoze.bfg.threadlocal import manager
from repoze.bfg.traversal import DefaultRootFactory
from repoze.bfg.traversal import ModelGraphTraverser
from repoze.bfg.view import default_forbidden_view
from repoze.bfg.view import default_notfound_view
make_app = make_app # prevent pyflakes from complaining
class Router(object):
""" The main repoze.bfg WSGI application. """
implements(IRouter)
debug_notfound = False
threadlocal_manager = manager
def __init__(self, registry):
q = registry.queryUtility
self.logger = q(IDebugLogger)
self.notfound_view = q(INotFoundView, default=default_notfound_view)
self.forbidden_view = q(IForbiddenView, default=default_forbidden_view)
self.root_factory = q(IRootFactory, default=DefaultRootFactory)
self.routes_mapper = q(IRoutesMapper)
self.root_policy = self.root_factory # b/w compat
self.registry = registry
settings = registry.queryUtility(ISettings)
if settings is not None:
self.debug_notfound = settings['debug_notfound']
def __call__(self, environ, start_response):
"""
Accept ``environ`` and ``start_response``; route requests to
``repoze.bfg`` views based on registrations within the
application registry; call ``start_response`` and return an
iterable.
"""
registry = self.registry
has_listeners = registry.has_listeners
logger = self.logger
manager = self.threadlocal_manager
threadlocals = {'registry':registry, 'request':None}
manager.push(threadlocals)
try:
# setup
request = Request(environ)
threadlocals['request'] = request
attrs = request.__dict__
attrs['registry'] = registry
has_listeners and registry.notify(NewRequest(request))
# root resolution
root_factory = self.root_factory
if self.routes_mapper is not None:
info = self.routes_mapper(request)
match, route = info['match'], info['route']
if route is not None:
environ['wsgiorg.routing_args'] = ((), match)
environ['bfg.routes.route'] = route
environ['bfg.routes.matchdict'] = match
request.matchdict = match
iface = registry.queryUtility(IRouteRequest,
name=route.name)
if iface is not None:
alsoProvides(request, iface)
root_factory = route.factory or self.root_factory
root = root_factory(request)
attrs['root'] = root
# view lookup
traverser = registry.adapters.queryAdapter(root, ITraverser)
if traverser is None:
traverser = ModelGraphTraverser(root)
tdict = traverser(request)
context, view_name, subpath, traversed, vroot, vroot_path = (
tdict['context'], tdict['view_name'], tdict['subpath'],
tdict['traversed'], tdict['virtual_root'],
tdict['virtual_root_path'])
attrs.update(tdict)
has_listeners and registry.notify(AfterTraversal(request))
provides = map(providedBy, (context, request))
view_callable = registry.adapters.lookup(
provides, IView, name=view_name, default=None)
# view execution
if view_callable is None:
if self.debug_notfound:
msg = (
'debug_notfound of url %s; path_info: %r, context: %r, '
'view_name: %r, subpath: %r, traversed: %r, '
'root: %r, vroot: %r, vroot_path: %r' % (
request.url, request.path_info, context, view_name,
subpath, traversed, root, vroot, vroot_path)
)
logger and logger.debug(msg)
else:
msg = request.path_info
environ['repoze.bfg.message'] = msg
response = self.notfound_view(context, request)
else:
try:
response = view_callable(context, request)
except Forbidden, why:
msg = why[0]
environ['repoze.bfg.message'] = msg
response = self.forbidden_view(context, request)
except NotFound, why:
msg = why[0]
environ['repoze.bfg.message'] = msg
response = self.notfound_view(context, request)
# response handling
has_listeners and registry.notify(NewResponse(response))
try:
headers = response.headerlist
app_iter = response.app_iter
status = response.status
except AttributeError:
raise ValueError(
'Non-response object returned from view named %s '
'(and no renderer): %r' % (view_name, response))
if 'global_response_headers' in attrs:
headers = list(headers)
headers.extend(attrs['global_response_headers'])
start_response(response.status, headers)
return response.app_iter
finally:
manager.pop()
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