59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
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#
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# communication.py: spoke-to-hub communication code
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#
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# Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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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, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Chris Lumens <clumens@redhat.com>
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import Queue
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# A queue to be used for communicating information from a spoke back to its
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# hub. This information includes things like marking spokes as ready and
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# updating the status line to tell the user why a spoke is not yet available.
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# This queue should have elements of the following format pushed into it:
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#
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# (HUB_CODE_*, [arguments])
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#
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# Arguments vary based on the code given, but the first argument must always
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# be the name of the class of the spoke to be acted upon. See below for more
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# details.
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hubQ = Queue.Queue()
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# Arguments:
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#
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# _READY - [spoke_name, justUpdate]
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# _NOT_READY - [spoke_name]
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# _MESSAGE - [spoke_name, string]
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HUB_CODE_READY = 0
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HUB_CODE_NOT_READY = 1
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HUB_CODE_MESSAGE = 2
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# Convenience methods to put things into the queue without the user having to
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# know the details of the queue.
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def send_ready(spoke, justUpdate=False):
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"""Tell the hub that a spoke given by the name "spoke" has become ready,
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and that it should be made sensitive on the hub. Some processing may
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also occur after a spoke has become ready. However, if the justUpdate
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parameter is True, no processing will occur.
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"""
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hubQ.put((HUB_CODE_READY, [spoke, justUpdate]))
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def send_not_ready(spoke):
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hubQ.put((HUB_CODE_NOT_READY, [spoke]))
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def send_message(spoke, msg):
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hubQ.put((HUB_CODE_MESSAGE, [spoke, msg]))
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