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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 zope.deprecation import deprecated
from pyramid.interfaces import IDebugLogger
from pyramid.interfaces import IExceptionViewClassifier
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.events import ContextFound
from pyramid.events import NewRequest
from pyramid.events import NewResponse
from pyramid.exceptions import NotFound
from pyramid.request import Request
from pyramid.threadlocal import manager
from pyramid.traversal import DefaultRootFactory
from pyramid.traversal import ResourceTreeTraverser
from pyramid.config import Configurator # b/c
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)
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 __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
adapters = registry.adapters
has_listeners = registry.has_listeners
logger = self.logger
manager = self.threadlocal_manager
request = None
threadlocals = {'registry':registry, 'request':request}
manager.push(threadlocals)
try: # matches finally: manager.pop()
try: # matches finally: ... call request finished callbacks ...
# 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 object
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 None:
if self.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['bfg.routes.route'] = route
environ['bfg.routes.matchdict'] = match
attrs['matchdict'] = match
attrs['matched_route'] = route
if self.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,
route.predicates)
)
logger and logger.debug(msg)
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 registry.notify(ContextFound(request))
# find a view callable
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
raise NotFound(msg)
else:
response = view_callable(context, request)
# handle exceptions raised during root finding and view-exec
except Exception, why:
attrs['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:
msg = ''
# repoze.bfg.message docs-deprecated in Pyramid 1.0
environ['repoze.bfg.message'] = msg
response = view_callable(why, request)
# process the response
has_listeners and registry.notify(NewResponse(request,response))
if request.response_callbacks:
request._process_response_callbacks(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))
finally:
if request is not None and request.finished_callbacks:
request._process_finished_callbacks()
start_response(status, headers)
return app_iter
finally:
manager.pop()
# note that ``options`` is a b/w compat alias for ``settings`` and
# ``Configurator`` is a testing dep inj
def make_app(root_factory, package=None, filename='configure.zcml',
settings=None, options=None, Configurator=Configurator):
""" Return a Router object, representing a fully configured
:app:`Pyramid` WSGI application.
.. warning:: Use of this function is deprecated as of
:app:`Pyramid` 1.0. You should instead use a
:class:`pyramid.config.Configurator` instance to
perform startup configuration as shown in
:ref:`configuration_narr`.
``root_factory`` must be a callable that accepts a :term:`request`
object and which returns a traversal root object. The traversal
root returned by the root factory is the *default* traversal root;
it can be overridden on a per-view basis. ``root_factory`` may be
``None``, in which case a 'default default' traversal root is
used.
``package`` is a Python :term:`package` or module representing the
application's package. It is optional, defaulting to ``None``.
``package`` may be ``None``. If ``package`` is ``None``, the
``filename`` passed or the value in the ``options`` dictionary
named ``configure_zcml`` must be a) absolute pathname to a
:term:`ZCML` file that represents the application's configuration
*or* b) a :term:`asset specification` to a :term:`ZCML` file in
the form ``dotted.package.name:relative/file/path.zcml``.
``filename`` is the filesystem path to a ZCML file (optionally
relative to the package path) that should be parsed to create the
application registry. It defaults to ``configure.zcml``. It can
also be a ;term:`asset specification` in the form
``dotted_package_name:relative/file/path.zcml``. Note that if any
value for ``configure_zcml`` is passed within the ``settings``
dictionary, the value passed as ``filename`` will be ignored,
replaced with the ``configure_zcml`` value.
``settings``, if used, should be a dictionary containing runtime
settings (e.g. the key/value pairs in an app section of a
PasteDeploy file), with each key representing the option and the
key's value representing the specific option value,
e.g. ``{'reload_templates':True}``. Note that the keyword
parameter ``options`` is a backwards compatibility alias for the
``settings`` keyword parameter.
"""
settings = settings or options or {}
zcml_file = settings.get('configure_zcml', filename)
config = Configurator(package=package, settings=settings,
root_factory=root_factory, autocommit=True)
config.hook_zca()
config.begin()
config.load_zcml(zcml_file)
config.end()
return config.make_wsgi_app()
deprecated(
'make_app',
'pyramid.router.make_app is deprecated as of Pyramid 1.0. Use '
'an instance of ``pyramid.config.Configurator`` to configure your '
'application instead.')