~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2007-2010 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

import bzrlib.hooks

from bzrlib import transport

from bzrlib.tests import features

# SFTPTransport offers better performances but relies on paramiko, if paramiko

# is not available, we fallback to FtpTransport

if features.paramiko.available():

    from bzrlib.tests import test_sftp_transport

    from bzrlib.transport import sftp

    _backing_scheme = 'sftp'

    _backing_transport_class = sftp.SFTPTransport

    _backing_test_class = test_sftp_transport.TestCaseWithSFTPServer

else:

    from bzrlib.transport import ftp

    from bzrlib.tests import test_ftp_transport

    _backing_scheme = 'ftp'

    _backing_transport_class = ftp.FtpTransport

    _backing_test_class = test_ftp_transport.TestCaseWithFTPServer

from bzrlib.transport import (

    ConnectedTransport,

    register_transport,

    register_urlparse_netloc_protocol,

    unregister_transport,

    _unregister_urlparse_netloc_protocol,

    )

class TransportHooks(bzrlib.hooks.Hooks):

    """Dict-mapping hook name to a list of callables for transport hooks"""

    def __init__(self):

        super(TransportHooks, self).__init__("bzrlib.tests.transport_util",

            "InstrumentedTransport.hooks")

        # Invoked when the transport has just created a new connection.

        # The api signature is (transport, connection, credentials)

        self['_set_connection'] = []

_hooked_scheme = 'hooked'

def _change_scheme_in(url, actual, desired):

    if not url.startswith(actual + '://'):

        raise AssertionError('url "%r" does not start with "%r]"'

                             % (url, actual))

    return desired + url[len(actual):]

class InstrumentedTransport(_backing_transport_class):

    """Instrumented transport class to test commands behavior"""

    hooks = TransportHooks()

    def __init__(self, base, _from_transport=None):

        if not base.startswith(_hooked_scheme + '://'):

            raise ValueError(base)

        # We need to trick the backing transport class about the scheme used

        # We'll do the reverse when we need to talk to the backing server

        fake_base = _change_scheme_in(base, _hooked_scheme, _backing_scheme)

        super(InstrumentedTransport, self).__init__(

            fake_base, _from_transport=_from_transport)

        # The following is needed to minimize the effects of our trick above

        # while retaining the best compatibility.

        self._parsed_url.scheme = _hooked_scheme

        base = self._unsplit_url(self._parsed_url.scheme,

                                 self._parsed_url.user,

                                 self._parsed_url.password,

                                 self._parsed_url.host, self._parsed_url.port,

                                 self._parsed_url.path)

        super(ConnectedTransport, self).__init__(base)

class ConnectionHookedTransport(InstrumentedTransport):

    """Transport instrumented to inspect connections"""

    def _set_connection(self, connection, credentials):

        """Called when a new connection is created """

        super(ConnectionHookedTransport, self)._set_connection(connection,

                                                               credentials)

        for hook in self.hooks['_set_connection']:

            hook(self, connection, credentials)

class TestCaseWithConnectionHookedTransport(_backing_test_class):

    def setUp(self):

        register_urlparse_netloc_protocol(_hooked_scheme)

        register_transport(_hooked_scheme, ConnectionHookedTransport)

        self.addCleanup(unregister_transport, _hooked_scheme,

                        ConnectionHookedTransport)

        self.addCleanup(_unregister_urlparse_netloc_protocol, _hooked_scheme)

        super(TestCaseWithConnectionHookedTransport, self).setUp()

        self.reset_connections()

        # Add the 'hooked' url to the permitted url list.

        # XXX: See TestCase.start_server. This whole module shouldn't need to

        # exist - a bug has been filed on that. once its cleanedup/removed, the

        # standard test support code will work and permit the server url

        # correctly.

        url = self.get_url()

        t = transport.get_transport(url)

        if t.base.endswith('work/'):

            t = t.clone('../..')

        self.permit_url(t.base)

    def get_url(self, relpath=None):

        super_self = super(TestCaseWithConnectionHookedTransport, self)

        url = super_self.get_url(relpath)

        # Replace the backing scheme by our own (see

        # InstrumentedTransport.__init__)

        url = _change_scheme_in(url, _backing_scheme, _hooked_scheme)

        return url

    def start_logging_connections(self):

        self.overrideAttr(InstrumentedTransport, 'hooks', TransportHooks())

        # We preserved the hooks class attribute. Now we install our hook.

        ConnectionHookedTransport.hooks.install_named_hook(

            '_set_connection', self._collect_connection, None)

    def reset_connections(self):

        self.connections = []

    def _collect_connection(self, transport, connection, credentials):

        # Note: uncomment the following line and use 'bt' under pdb, that will

        # identify all the connections made including the extraneous ones.

        # import pdb; pdb.set_trace()

        self.connections.append(connection)