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router.py
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router.py
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from zope.interface import implements
from zope.interface import providedBy
from pyramid.interfaces import IDebugLogger
from pyramid.interfaces import IRequest
from pyramid.interfaces import IRootFactory
from pyramid.interfaces import IRouteRequest
from pyramid.interfaces import IRouter
from pyramid.interfaces import IRequestFactory
from pyramid.interfaces import IRoutesMapper
from pyramid.interfaces import ITraverser
from pyramid.interfaces import IView
from pyramid.interfaces import IViewClassifier
from pyramid.interfaces import ITweens
from pyramid.events import ContextFound
from pyramid.events import NewRequest
from pyramid.events import NewResponse
from pyramid.httpexceptions import HTTPNotFound
from pyramid.request import Request
from pyramid.threadlocal import manager
from pyramid.traversal import DefaultRootFactory
from pyramid.traversal import ResourceTreeTraverser
from pyramid.tweens import excview_tween_factory
class Router(object):
implements(IRouter)
debug_notfound = False
debug_routematch = 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)
tweens = q(ITweens)
if tweens is None:
tweens = excview_tween_factory
self.handle_request = tweens(self.handle_request, registry)
self.root_policy = self.root_factory # b/w compat
self.registry = registry
settings = registry.settings
if settings is not None:
self.debug_notfound = settings['debug_notfound']
self.debug_routematch = settings['debug_routematch']
def handle_request(self, request):
attrs = request.__dict__
registry = attrs['registry']
request.request_iface = IRequest
context = None
routes_mapper = self.routes_mapper
debug_routematch = self.debug_routematch
adapters = registry.adapters
has_listeners = registry.has_listeners
notify = registry.notify
logger = self.logger
has_listeners and notify(NewRequest(request))
# find the root object
root_factory = self.root_factory
if routes_mapper is not None:
info = routes_mapper(request)
match, route = info['match'], info['route']
if route is None:
if debug_routematch:
msg = ('no route matched for url %s' %
request.url)
logger and logger.debug(msg)
else:
# TODO: kill off bfg.routes.* environ keys
# when traverser requires request arg, and
# cant cope with environ anymore (they are
# docs-deprecated as of BFG 1.3)
environ = request.environ
environ['bfg.routes.route'] = route
environ['bfg.routes.matchdict'] = match
attrs['matchdict'] = match
attrs['matched_route'] = route
if debug_routematch:
msg = (
'route matched for url %s; '
'route_name: %r, '
'path_info: %r, '
'pattern: %r, '
'matchdict: %r, '
'predicates: %r' % (
request.url,
route.name,
request.path_info,
route.pattern, match,
', '.join([p.__text__ for p in route.predicates]))
)
logger and logger.debug(msg)
request.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 context
traverser = adapters.queryAdapter(root, ITraverser)
if traverser is None:
traverser = ResourceTreeTraverser(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 notify(ContextFound(request))
# find a view callable
context_iface = providedBy(context)
view_callable = adapters.lookup(
(IViewClassifier, request.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
raise HTTPNotFound(msg)
else:
response = view_callable(context, request)
return response
def __call__(self, environ, start_response):
"""
Accept ``environ`` and ``start_response``; create a
:term:`request` and route the request to a :app:`Pyramid`
view based on introspection of :term:`view configuration`
within the application registry; call ``start_response`` and
return an iterable.
"""
registry = self.registry
has_listeners = self.registry.has_listeners
notify = self.registry.notify
request = self.request_factory(environ)
threadlocals = {'registry':registry, 'request':request}
manager = self.threadlocal_manager
manager.push(threadlocals)
request.registry = registry
try:
try:
response = self.handle_request(request)
has_listeners and notify(NewResponse(request, response))
if request.response_callbacks:
request._process_response_callbacks(response)
return response(request.environ, start_response)
finally:
if request.finished_callbacks:
request._process_finished_callbacks()
finally:
manager.pop()