64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# Demux loader: imports a demux module appropriate for this platform.
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# Copyright 2012 Ray Brown
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# The License is also distributed with this work in the file named "LICENSE."
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""UDP Demux
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A UDP demux is a wrapper for a datagram socket. The demux must be initialized
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with an unconnected datagram socket, referred to as the root socket. Once
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initialized, the demux will create new connections to peer endpoints upon
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arrival of datagrams from a new endpoint. Such a connection is of a
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socket-derived type, and will receive datagrams only from the peer endpoint for
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which it was created, and that are sent to the root socket.
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Connections must be used for receiving datagrams only. Outgoing traffic should
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be sent through the root socket.
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Varying implementations of this functionality are provided for different
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platforms.
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"""
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import sys
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if sys.platform.startswith('win') or sys.platform.startswith('cygwin'):
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from router import UDPDemux
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_routing = True
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else:
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from osnet import UDPDemux
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_routing = False
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_default_demux = None
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def force_routing_demux():
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global _routing
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if _routing:
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return False # no change - already loaded
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global UDPDemux, _default_demux
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import router
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_default_demux = UDPDemux
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UDPDemux = router.UDPDemux
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_routing = True
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return True # new router loaded and switched
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def reset_default_demux():
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global UDPDemux, _routing, _default_demux
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if _default_demux:
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UDPDemux = _default_demux
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_default_demux = None
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_routing = not _routing
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__all__ = ["UDPDemux", "force_routing_demux", "reset_default_demux"]
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