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# encoding: utf-8 |
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""" |
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command/limit.py |
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Created by Thomas Mangin on 2017-07-01. |
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Copyright (c) 2009-2017 Exa Networks. All rights reserved. |
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License: 3-clause BSD. (See the COPYRIGHT file) |
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""" |
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import re |
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def extract_neighbors (command): |
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"""Return a list of neighbor definition : the neighbor definition is a list of string which are in the neighbor indexing string""" |
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# This function returns a list and a string |
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# The first list contains parsed neighbor to match against our defined peers |
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# The string is the command to be run for those peers |
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# The parsed neighbor is a list of the element making the neighbor string so each part can be checked against the neighbor name |
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returned = [] |
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neiremain = command.split(' ', 1) |
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if len(neiremain) == 1: |
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return [], command |
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neighbor, remaining = neiremain |
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if neighbor != 'neighbor': |
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return [],command |
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ipcmd = remaining.split(' ', 1) |
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if len(ipcmd) == 1: |
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return [], remaining |
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ip, command = ipcmd |
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definition = ['neighbor %s' % (ip)] |
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if ' ' not in command: |
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return definition,command |
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while True: |
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try: |
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key,value,remaining = command.split(' ',2) |
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except ValueError: |
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# single word command |
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keyval = command.split(' ', 1) |
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if len(keyval) == 1: |
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return definition,command |
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key, value = keyval |
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# we have further filtering |
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if key == ',': |
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returned.append(definition) |
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_,command = command.split(' ',1) |
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definition = [] |
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continue |
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if key not in ['neighbor','local-ip','local-as','peer-as','router-id','family-allowed']: |
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if definition: |
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returned.append(definition) |
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break |
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definition.append('%s %s' % (key,value)) |
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command = remaining |
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return returned,command |
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def match_neighbor (description, name): |
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for string in description: |
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if re.search(r'(^|\s)%s($|\s|,)' % re.escape(string), name) is None: |
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return False |
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return True |
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def match_neighbors (peers,descriptions): |
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"""Return the sublist of peers matching the description passed, or None if no description is given""" |
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if not descriptions: |
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return peers |
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returned = [] |
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for peer_name in peers: |
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for description in descriptions: |
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if match_neighbor(description, peer_name): |
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if peer_name not in returned: |
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returned.append(peer_name) |
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return returned |
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Exa-Networks /
exabgp
