diff options
Diffstat (limited to 'cherrypy/_cptree.py')
| -rwxr-xr-x | cherrypy/_cptree.py | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/cherrypy/_cptree.py b/cherrypy/_cptree.py new file mode 100755 index 0000000..67ce546 --- /dev/null +++ b/cherrypy/_cptree.py @@ -0,0 +1,279 @@ +"""CherryPy Application and Tree objects.""" + +import os +import cherrypy +from cherrypy._cpcompat import ntou +from cherrypy import _cpconfig, _cplogging, _cprequest, _cpwsgi, tools +from cherrypy.lib import httputil + + +class Application(object): + """A CherryPy Application. + + Servers and gateways should not instantiate Request objects directly. + Instead, they should ask an Application object for a request object. + + An instance of this class may also be used as a WSGI callable + (WSGI application object) for itself. + """ + + root = None + """The top-most container of page handlers for this app. Handlers should + be arranged in a hierarchy of attributes, matching the expected URI + hierarchy; the default dispatcher then searches this hierarchy for a + matching handler. When using a dispatcher other than the default, + this value may be None.""" + + config = {} + """A dict of {path: pathconf} pairs, where 'pathconf' is itself a dict + of {key: value} pairs.""" + + namespaces = _cpconfig.NamespaceSet() + toolboxes = {'tools': cherrypy.tools} + + log = None + """A LogManager instance. See _cplogging.""" + + wsgiapp = None + """A CPWSGIApp instance. See _cpwsgi.""" + + request_class = _cprequest.Request + response_class = _cprequest.Response + + relative_urls = False + + def __init__(self, root, script_name="", config=None): + self.log = _cplogging.LogManager(id(self), cherrypy.log.logger_root) + self.root = root + self.script_name = script_name + self.wsgiapp = _cpwsgi.CPWSGIApp(self) + + self.namespaces = self.namespaces.copy() + self.namespaces["log"] = lambda k, v: setattr(self.log, k, v) + self.namespaces["wsgi"] = self.wsgiapp.namespace_handler + + self.config = self.__class__.config.copy() + if config: + self.merge(config) + + def __repr__(self): + return "%s.%s(%r, %r)" % (self.__module__, self.__class__.__name__, + self.root, self.script_name) + + script_name_doc = """The URI "mount point" for this app. A mount point is that portion of + the URI which is constant for all URIs that are serviced by this + application; it does not include scheme, host, or proxy ("virtual host") + portions of the URI. + + For example, if script_name is "/my/cool/app", then the URL + "http://www.example.com/my/cool/app/page1" might be handled by a + "page1" method on the root object. + + The value of script_name MUST NOT end in a slash. If the script_name + refers to the root of the URI, it MUST be an empty string (not "/"). + + If script_name is explicitly set to None, then the script_name will be + provided for each call from request.wsgi_environ['SCRIPT_NAME']. + """ + def _get_script_name(self): + if self._script_name is None: + # None signals that the script name should be pulled from WSGI environ. + return cherrypy.serving.request.wsgi_environ['SCRIPT_NAME'].rstrip("/") + return self._script_name + def _set_script_name(self, value): + if value: + value = value.rstrip("/") + self._script_name = value + script_name = property(fget=_get_script_name, fset=_set_script_name, + doc=script_name_doc) + + def merge(self, config): + """Merge the given config into self.config.""" + _cpconfig.merge(self.config, config) + + # Handle namespaces specified in config. + self.namespaces(self.config.get("/", {})) + + def find_config(self, path, key, default=None): + """Return the most-specific value for key along path, or default.""" + trail = path or "/" + while trail: + nodeconf = self.config.get(trail, {}) + + if key in nodeconf: + return nodeconf[key] + + lastslash = trail.rfind("/") + if lastslash == -1: + break + elif lastslash == 0 and trail != "/": + trail = "/" + else: + trail = trail[:lastslash] + + return default + + def get_serving(self, local, remote, scheme, sproto): + """Create and return a Request and Response object.""" + req = self.request_class(local, remote, scheme, sproto) + req.app = self + + for name, toolbox in self.toolboxes.items(): + req.namespaces[name] = toolbox + + resp = self.response_class() + cherrypy.serving.load(req, resp) + cherrypy.engine.timeout_monitor.acquire() + cherrypy.engine.publish('acquire_thread') + + return req, resp + + def release_serving(self): + """Release the current serving (request and response).""" + req = cherrypy.serving.request + + cherrypy.engine.timeout_monitor.release() + + try: + req.close() + except: + cherrypy.log(traceback=True, severity=40) + + cherrypy.serving.clear() + + def __call__(self, environ, start_response): + return self.wsgiapp(environ, start_response) + + +class Tree(object): + """A registry of CherryPy applications, mounted at diverse points. + + An instance of this class may also be used as a WSGI callable + (WSGI application object), in which case it dispatches to all + mounted apps. + """ + + apps = {} + """ + A dict of the form {script name: application}, where "script name" + is a string declaring the URI mount point (no trailing slash), and + "application" is an instance of cherrypy.Application (or an arbitrary + WSGI callable if you happen to be using a WSGI server).""" + + def __init__(self): + self.apps = {} + + def mount(self, root, script_name="", config=None): + """Mount a new app from a root object, script_name, and config. + + root + An instance of a "controller class" (a collection of page + handler methods) which represents the root of the application. + This may also be an Application instance, or None if using + a dispatcher other than the default. + + script_name + A string containing the "mount point" of the application. + This should start with a slash, and be the path portion of the + URL at which to mount the given root. For example, if root.index() + will handle requests to "http://www.example.com:8080/dept/app1/", + then the script_name argument would be "/dept/app1". + + It MUST NOT end in a slash. If the script_name refers to the + root of the URI, it MUST be an empty string (not "/"). + + config + A file or dict containing application config. + """ + if script_name is None: + raise TypeError( + "The 'script_name' argument may not be None. Application " + "objects may, however, possess a script_name of None (in " + "order to inpect the WSGI environ for SCRIPT_NAME upon each " + "request). You cannot mount such Applications on this Tree; " + "you must pass them to a WSGI server interface directly.") + + # Next line both 1) strips trailing slash and 2) maps "/" -> "". + script_name = script_name.rstrip("/") + + if isinstance(root, Application): + app = root + if script_name != "" and script_name != app.script_name: + raise ValueError("Cannot specify a different script name and " + "pass an Application instance to cherrypy.mount") + script_name = app.script_name + else: + app = Application(root, script_name) + + # If mounted at "", add favicon.ico + if (script_name == "" and root is not None + and not hasattr(root, "favicon_ico")): + favicon = os.path.join(os.getcwd(), os.path.dirname(__file__), + "favicon.ico") + root.favicon_ico = tools.staticfile.handler(favicon) + + if config: + app.merge(config) + + self.apps[script_name] = app + + return app + + def graft(self, wsgi_callable, script_name=""): + """Mount a wsgi callable at the given script_name.""" + # Next line both 1) strips trailing slash and 2) maps "/" -> "". + script_name = script_name.rstrip("/") + self.apps[script_name] = wsgi_callable + + def script_name(self, path=None): + """The script_name of the app at the given path, or None. + + If path is None, cherrypy.request is used. + """ + if path is None: + try: + request = cherrypy.serving.request + path = httputil.urljoin(request.script_name, + request.path_info) + except AttributeError: + return None + + while True: + if path in self.apps: + return path + + if path == "": + return None + + # Move one node up the tree and try again. + path = path[:path.rfind("/")] + + def __call__(self, environ, start_response): + # If you're calling this, then you're probably setting SCRIPT_NAME + # to '' (some WSGI servers always set SCRIPT_NAME to ''). + # Try to look up the app using the full path. + env1x = environ + if environ.get(ntou('wsgi.version')) == (ntou('u'), 0): + env1x = _cpwsgi.downgrade_wsgi_ux_to_1x(environ) + path = httputil.urljoin(env1x.get('SCRIPT_NAME', ''), + env1x.get('PATH_INFO', '')) + sn = self.script_name(path or "/") + if sn is None: + start_response('404 Not Found', []) + return [] + + app = self.apps[sn] + + # Correct the SCRIPT_NAME and PATH_INFO environ entries. + environ = environ.copy() + if environ.get(u'wsgi.version') == (u'u', 0): + # Python 2/WSGI u.0: all strings MUST be of type unicode + enc = environ[u'wsgi.url_encoding'] + environ[u'SCRIPT_NAME'] = sn.decode(enc) + environ[u'PATH_INFO'] = path[len(sn.rstrip("/")):].decode(enc) + else: + # Python 2/WSGI 1.x: all strings MUST be of type str + environ['SCRIPT_NAME'] = sn + environ['PATH_INFO'] = path[len(sn.rstrip("/")):] + return app(environ, start_response) + |