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from zope.interface import implements
from zope.interface import providedBy
from repoze.bfg.interfaces import IDebugLogger
from repoze.bfg.interfaces import IExceptionViewClassifier
from repoze.bfg.interfaces import IRequest
from repoze.bfg.interfaces import IRootFactory
from repoze.bfg.interfaces import IRouteRequest
from repoze.bfg.interfaces import IRouter
from repoze.bfg.interfaces import IRequestFactory
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.interfaces import IViewClassifier
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 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
make_app # prevent pyflakes from complaining
class Router(object):
implements(IRouter)
debug_notfound = False
threadlocal_manager = manager
def __init__(self, registry):
q = registry.queryUtility
self.logger = q(IDebugLogger)
self.root_factory = q(IRootFactory, default=DefaultRootFactory)
self.routes_mapper = q(IRoutesMapper)
self.request_factory = q(IRequestFactory, default=Request)
self.root_policy = self.root_factory # b/w compat
self.registry = registry
settings = q(ISettings)
if settings is not None:
self.debug_notfound = settings['debug_notfound']
def __call__(self, environ, start_response):
"""
Accept ``environ`` and ``start_response``; create a
:term:`request` and route the request to a :mod:`repoze.bfg`
view based on introspection of :term:`view configuration`
within the application registry; call ``start_response`` and
return an iterable.
"""
registry = self.registry
adapters = registry.adapters
has_listeners = registry.has_listeners
logger = self.logger
manager = self.threadlocal_manager
threadlocals = {'registry':registry, 'request':None}
manager.push(threadlocals)
try:
# create the request
request = self.request_factory(environ)
context = None
threadlocals['request'] = request
attrs = request.__dict__
attrs['registry'] = registry
has_listeners and registry.notify(NewRequest(request))
request_iface = IRequest
try:
# find the root
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
attrs['matchdict'] = match
request_iface = registry.queryUtility(
IRouteRequest,
name=route.name,
default=IRequest)
root_factory = route.factory or self.root_factory
root = root_factory(request)
attrs['root'] = root
# find a view callable
traverser = 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))
context_iface = providedBy(context)
view_callable = adapters.lookup(
(IViewClassifier, request_iface, context_iface),
IView, name=view_name, default=None)
# invoke the view callable
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
raise NotFound(msg)
else:
response = view_callable(context, request)
# handle exceptions raised during root finding and view lookup
except Exception, why:
for_ = (IExceptionViewClassifier,
request_iface.combined,
providedBy(why))
view_callable = adapters.lookup(for_, IView, default=None)
if view_callable is None:
raise
try:
msg = why[0]
except Exception:
msg = ''
environ['repoze.bfg.message'] = msg
attrs['exception'] = why
response = view_callable(why, request)
# process the response
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(status, headers)
return app_iter
finally:
manager.pop()
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