101 lines
3.0 KiB
Python
101 lines
3.0 KiB
Python
import re
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import warnings
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from .protocols.base import BaseProtocol
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from .exceptions import WebSocketError
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try:
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from collections import OrderedDict
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except ImportError:
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class OrderedDict:
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pass
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class WebSocketApplication(object):
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protocol_class = BaseProtocol
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def __init__(self, ws):
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self.protocol = self.protocol_class(self)
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self.ws = ws
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def handle(self):
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self.protocol.on_open()
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while True:
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try:
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message = self.ws.receive()
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except WebSocketError:
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self.protocol.on_close()
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break
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self.protocol.on_message(message)
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def on_open(self, *args, **kwargs):
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pass
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def on_close(self, *args, **kwargs):
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pass
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def on_message(self, message, *args, **kwargs):
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self.ws.send(message, **kwargs)
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@classmethod
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def protocol_name(cls):
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return cls.protocol_class.PROTOCOL_NAME
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class Resource(object):
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def __init__(self, apps=None):
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self.apps = apps if apps else []
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if isinstance(apps, dict):
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if not isinstance(apps, OrderedDict):
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warnings.warn("Using an unordered dictionary for the "
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"app list is discouraged and may lead to "
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"undefined behavior.", UserWarning)
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self.apps = apps.items()
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# An app can either be a standard WSGI application (an object we call with
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# __call__(self, environ, start_response)) or a class we instantiate
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# (and which can handle websockets). This function tells them apart.
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# Override this if you have apps that can handle websockets but don't
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# fulfill these criteria.
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def _is_websocket_app(self, app):
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return isinstance(app, type) and issubclass(app, WebSocketApplication)
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def _app_by_path(self, environ_path, is_websocket_request):
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# Which app matched the current path?
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for path, app in self.apps:
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if re.match(path, environ_path):
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if is_websocket_request == self._is_websocket_app(app):
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return app
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return None
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def app_protocol(self, path):
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# app_protocol will only be called for websocket apps
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app = self._app_by_path(path, True)
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if hasattr(app, 'protocol_name'):
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return app.protocol_name()
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else:
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return ''
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def __call__(self, environ, start_response):
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environ = environ
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is_websocket_call = 'wsgi.websocket' in environ
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current_app = self._app_by_path(environ['PATH_INFO'], is_websocket_call)
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if current_app is None:
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raise Exception("No apps defined")
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if is_websocket_call:
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ws = environ['wsgi.websocket']
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current_app = current_app(ws)
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current_app.ws = ws # TODO: needed?
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current_app.handle()
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# Always return something, calling WSGI middleware may rely on it
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return []
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else:
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return current_app(environ, start_response)
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