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Viewing changes to bzrlib/tests/transport_util.py

  • Committer: Andrew Bennetts
  • Date: 2007-09-28 04:40:46 UTC
  • mto: This revision was merged to the branch mainline in revision 2905.
  • Revision ID: andrew.bennetts@canonical.com-20070928044046-fyl5mq8gszi78g5y
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bzrlib/tests/transport_util.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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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 General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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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 General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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import bzrlib.hooks
 
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# SFTPTransport offers better performances but relies on paramiko, if paramiko
 
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# is not available, we fallback to FtpTransport
 
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from bzrlib.tests import test_sftp_transport
 
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if test_sftp_transport.paramiko_loaded:
 
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    from bzrlib.transport import sftp
 
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    _backing_scheme = 'sftp'
 
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    _backing_transport_class = sftp.SFTPTransport
 
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    _backing_test_class = test_sftp_transport.TestCaseWithSFTPServer
 
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else:
 
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    from bzrlib.transport import ftp
 
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    from bzrlib.tests import test_ftp_transport
 
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    _backing_scheme = 'ftp'
 
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    _backing_transport_class = ftp.FtpTransport
 
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    _backing_test_class = test_ftp_transport.TestCaseWithFTPServer
 
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from bzrlib.transport import (
 
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    ConnectedTransport,
 
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    register_transport,
 
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    register_urlparse_netloc_protocol,
 
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    unregister_transport,
 
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    _unregister_urlparse_netloc_protocol,
 
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    )
 
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class TransportHooks(bzrlib.hooks.Hooks):
 
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    """Dict-mapping hook name to a list of callables for transport hooks"""
 
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    def __init__(self):
 
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        super(TransportHooks, self).__init__()
 
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        # Invoked when the transport has just created a new connection.
 
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        # The api signature is (transport, connection, credentials)
 
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        self['_set_connection'] = []
 
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_hooked_scheme = 'hooked'
 
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def _change_scheme_in(url, actual, desired):
 
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    if not url.startswith(actual + '://'):
 
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        raise AssertionError('url "%r" does not start with "%r]"'
 
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                             % (url, actual))
 
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    return desired + url[len(actual):]
 
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class InstrumentedTransport(_backing_transport_class):
 
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    """Instrumented transport class to test commands behavior"""
 
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    hooks = TransportHooks()
 
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    def __init__(self, base, _from_transport=None):
 
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        assert base.startswith(_hooked_scheme + '://')
 
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        # We need to trick the backing transport class about the scheme used
 
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        # We'll do the reverse when we need to talk to the backing server
 
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        fake_base = _change_scheme_in(base, _hooked_scheme, _backing_scheme)
 
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        super(InstrumentedTransport, self).__init__(
 
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            fake_base, _from_transport=_from_transport)
 
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        # The following is needed to minimize the effects of our trick above
 
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        # while retaining the best compatibility.
 
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        self._scheme = _hooked_scheme
 
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        base = self._unsplit_url(self._scheme,
 
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                                 self._user, self._password,
 
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                                 self._host, self._port,
 
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                                 self._path)
 
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        super(ConnectedTransport, self).__init__(base)
 
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class ConnectionHookedTransport(InstrumentedTransport):
 
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    """Transport instrumented to inspect connections"""
 
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    def _set_connection(self, connection, credentials):
 
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        """Called when a new connection is created """
 
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        super(ConnectionHookedTransport, self)._set_connection(connection,
 
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                                                               credentials)
 
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        for hook in self.hooks['_set_connection']:
 
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            hook(self, connection, credentials)
 
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class TestCaseWithConnectionHookedTransport(_backing_test_class):
 
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    def setUp(self):
 
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        register_urlparse_netloc_protocol(_hooked_scheme)
 
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        register_transport(_hooked_scheme, ConnectionHookedTransport)
 
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        def unregister():
 
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            unregister_transport(_hooked_scheme, ConnectionHookedTransport)
 
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            _unregister_urlparse_netloc_protocol(_hooked_scheme)
 
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        self.addCleanup(unregister)
 
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        super(TestCaseWithConnectionHookedTransport, self).setUp()
 
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        self.reset_connections()
 
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    def get_url(self, relpath=None):
 
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        super_self = super(TestCaseWithConnectionHookedTransport, self)
 
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        url = super_self.get_url(relpath)
 
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        # Replace the backing scheme by our own (see
 
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        # InstrumentedTransport.__init__)
 
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        url = _change_scheme_in(url, _backing_scheme, _hooked_scheme)
 
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        return url
 
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    def install_hooks(self):
 
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        ConnectionHookedTransport.hooks.install_hook('_set_connection',
 
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                                                     self.set_connection_hook)
 
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        # uninstall our hooks when we are finished
 
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        self.addCleanup(self.reset_hooks)
 
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    def reset_hooks(self):
 
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        InstrumentedTransport.hooks = TransportHooks()
 
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    def reset_connections(self):
 
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        self.connections = []
 
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    def set_connection_hook(self, transport, connection, credentials):
 
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        # Note: uncomment the following line and use 'bt' under pdb, that will
 
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        # identify all the connections made including the extraneous ones.
 
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        # import pdb; pdb.set_trace()
 
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        self.connections.append(connection)
 
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