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# -*- coding: utf-8 -*-
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# Copyright (C) 2012-2017 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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"""
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Utility to call a WSGI app wrapped in a WSGIAppCaller object.
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"""
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import logging
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from Pyro4.errors import ConnectionClosedError
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log = logging.getLogger(__name__)
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def _get_clean_environ(environ):
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"""Return a copy of the WSGI environment without wsgi.* keys.
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It also omits any non-string values.
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:param environ: WSGI environment to clean
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:type environ: dict
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:returns: WSGI environment to pass to WSGIAppCaller.handle.
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:rtype: dict
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"""
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clean_environ = dict(
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(k, v) for k, v in environ.iteritems()
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if type(v) == str and type(k) == str and not k.startswith('wsgi.')
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)
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return clean_environ
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# pylint: disable=too-few-public-methods
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class RemoteAppCaller(object):
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"""Create and calls a remote WSGI app using the given factory.
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It first cleans the environment, so as to reduce the data transferred.
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"""
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def __init__(self, remote_wsgi, *args, **kwargs):
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"""
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:param remote_wsgi: The remote wsgi object that creates a
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WSGIAppCaller. This object
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has to have a handle method, with the signature:
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handle(environ, start_response, *args, **kwargs)
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:param args: args to be passed to the app creation
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:param kwargs: kwargs to be passed to the app creation
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"""
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self._remote_wsgi = remote_wsgi
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self._args = args
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self._kwargs = kwargs
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def __call__(self, environ, start_response):
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"""
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:param environ: WSGI environment with which the app will be run
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:type environ: dict
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:param start_response: callable of WSGI protocol
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:type start_response: callable
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:returns: an iterable with the data returned by the app
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:rtype: iterable<str>
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"""
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log.debug("Forwarding WSGI request via proxy %s", self._remote_wsgi)
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input_data = environ['wsgi.input'].read()
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clean_environ = _get_clean_environ(environ)
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try:
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data, status, headers = self._remote_wsgi.handle(
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clean_environ, input_data, *self._args, **self._kwargs)
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except ConnectionClosedError:
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log.debug('Remote Pyro Server ConnectionClosedError')
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self._remote_wsgi._pyroReconnect(tries=15)
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data, status, headers = self._remote_wsgi.handle(
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clean_environ, input_data, *self._args, **self._kwargs)
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log.debug("Got result from proxy, returning to WSGI container")
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start_response(status, headers)
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return data
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