~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2008-2012 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

"""Ping plugin for bzr."""

from __future__ import absolute_import

from bzrlib.commands import Command

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from bzrlib import errors

from bzrlib.smart.client import _SmartClient

from bzrlib.transport import get_transport

""")

class cmd_ping(Command):

    """Pings a Bazaar smart server.

    This command sends a 'hello' request to the given location using the bzr

    smart protocol, and reports the response.

    """

    takes_args = ['location']

    def run(self, location):

        transport = get_transport(location)

        try:

            medium = transport.get_smart_medium()

        except errors.NoSmartMedium, e:

            raise errors.BzrCommandError(str(e))

        client = _SmartClient(medium)

        # Use call_expecting_body (even though we don't expect a body) so that

        # we can see the response headers (if any) via the handler object.

        response, handler = client.call_expecting_body('hello')

        handler.cancel_read_body()

        self.outf.write('Response: %r\n' % (response,))

        if getattr(handler, 'headers', None) is not None:

            self.outf.write('Headers: %r\n' % (handler.headers,))