root / ncclient / glue.py @ bf31e33e
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1 | 2bfd0fef | Shikhar Bhushan | # Copyright 2009 Shikhar Bhushan
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2 | 2bfd0fef | Shikhar Bhushan | #
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3 | 2bfd0fef | Shikhar Bhushan | # Licensed under the Apache License, Version 2.0 (the "License");
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4 | 2bfd0fef | Shikhar Bhushan | # you may not use this file except in compliance with the License.
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5 | 2bfd0fef | Shikhar Bhushan | # You may obtain a copy of the License at
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6 | 2bfd0fef | Shikhar Bhushan | #
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7 | 2bfd0fef | Shikhar Bhushan | # http://www.apache.org/licenses/LICENSE-2.0
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8 | 2bfd0fef | Shikhar Bhushan | #
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9 | 2bfd0fef | Shikhar Bhushan | # Unless required by applicable law or agreed to in writing, software
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10 | 2bfd0fef | Shikhar Bhushan | # distributed under the License is distributed on an "AS IS" BASIS,
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11 | 2bfd0fef | Shikhar Bhushan | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 | 2bfd0fef | Shikhar Bhushan | # See the License for the specific language governing permissions and
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13 | 2bfd0fef | Shikhar Bhushan | # limitations under the License.
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14 | 2bfd0fef | Shikhar Bhushan | |
15 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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16 | 2bfd0fef | Shikhar Bhushan | |
17 | 2bfd0fef | Shikhar Bhushan | from cStringIO import StringIO |
18 | 2bfd0fef | Shikhar Bhushan | from Queue import Queue |
19 | 2bfd0fef | Shikhar Bhushan | from threading import Lock |
20 | 2bfd0fef | Shikhar Bhushan | from xml.etree import cElementTree as ET |
21 | 2bfd0fef | Shikhar Bhushan | |
22 | 2bfd0fef | Shikhar Bhushan | |
23 | 2bfd0fef | Shikhar Bhushan | def parse_root(raw): |
24 | 2bfd0fef | Shikhar Bhushan | '''Parse the top-level element from a string representing an XML document.
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25 | 2bfd0fef | Shikhar Bhushan |
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26 | 2bfd0fef | Shikhar Bhushan | Returns a `(tag, attributes)` tuple, where `tag` is a string representing
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27 | 2bfd0fef | Shikhar Bhushan | the qualified name of the root element and `attributes` is an
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28 | 2bfd0fef | Shikhar Bhushan | `{attribute: value}` dictionary.
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29 | 2bfd0fef | Shikhar Bhushan | '''
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30 | 2bfd0fef | Shikhar Bhushan | fp = StringIO(raw) |
31 | 2bfd0fef | Shikhar Bhushan | for event, element in ET.iterparse(fp, events=('start',)): |
32 | 2bfd0fef | Shikhar Bhushan | return (element.tag, element.attrib)
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33 | 2bfd0fef | Shikhar Bhushan | |
34 | 2bfd0fef | Shikhar Bhushan | |
35 | ea04739a | Shikhar Bhushan | class Subject(object): |
36 | bf31e33e | Shikhar Bhushan | |
37 | bf31e33e | Shikhar Bhushan | 'Meant for subclassing by transport.Session'
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38 | 2bfd0fef | Shikhar Bhushan | |
39 | 2bfd0fef | Shikhar Bhushan | def __init__(self): |
40 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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41 | e91a5349 | Shikhar Bhushan | self._q = Queue()
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42 | bf31e33e | Shikhar Bhushan | self._listeners = set() |
43 | 2bfd0fef | Shikhar Bhushan | self._lock = Lock()
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44 | e91a5349 | Shikhar Bhushan | |
45 | 2bfd0fef | Shikhar Bhushan | def _dispatch_received(self, raw): |
46 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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47 | 2bfd0fef | Shikhar Bhushan | root = parse_root(raw) |
48 | 2bfd0fef | Shikhar Bhushan | with self._lock: |
49 | 2bfd0fef | Shikhar Bhushan | listeners = list(self._listeners) |
50 | 2bfd0fef | Shikhar Bhushan | for l in listeners: |
51 | 4f748648 | Shikhar Bhushan | l.callback(root, raw) |
52 | 2bfd0fef | Shikhar Bhushan | |
53 | 2bfd0fef | Shikhar Bhushan | def _dispatch_error(self, err): |
54 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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55 | 2bfd0fef | Shikhar Bhushan | with self._lock: |
56 | 2bfd0fef | Shikhar Bhushan | listeners = list(self._listeners) |
57 | 2bfd0fef | Shikhar Bhushan | for l in listeners: |
58 | 2bfd0fef | Shikhar Bhushan | l.errback(err) |
59 | 2bfd0fef | Shikhar Bhushan | |
60 | 2bfd0fef | Shikhar Bhushan | def add_listener(self, listener): |
61 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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62 | 2bfd0fef | Shikhar Bhushan | with self._lock: |
63 | 2bfd0fef | Shikhar Bhushan | self._listeners.add(listener)
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64 | 2bfd0fef | Shikhar Bhushan | |
65 | 2bfd0fef | Shikhar Bhushan | def remove_listener(self, listener): |
66 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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67 | 2bfd0fef | Shikhar Bhushan | with self._lock: |
68 | 2bfd0fef | Shikhar Bhushan | self._listeners.discard(listener)
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69 | 2bfd0fef | Shikhar Bhushan | |
70 | ea04739a | Shikhar Bhushan | def get_listener_instance(self, cls): |
71 | ea04739a | Shikhar Bhushan | '''This is useful when we want to maintain one listener of a particular
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72 | ea04739a | Shikhar Bhushan | type per subject i.e. a multiton.
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73 | ea04739a | Shikhar Bhushan | '''
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74 | ea04739a | Shikhar Bhushan | with self._lock: |
75 | ea04739a | Shikhar Bhushan | for listener in self._listeners: |
76 | ea04739a | Shikhar Bhushan | if isinstance(listener, cls): |
77 | ea04739a | Shikhar Bhushan | return listener
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78 | ea04739a | Shikhar Bhushan | |
79 | 2bfd0fef | Shikhar Bhushan | def send(self, message): |
80 | 2bfd0fef | Shikhar Bhushan | "TODO: docstring"
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81 | 2bfd0fef | Shikhar Bhushan | logger.debug('queueing:%s' % message)
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82 | e91a5349 | Shikhar Bhushan | self._q.put(message)
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83 | 2bfd0fef | Shikhar Bhushan | |
84 | 2bfd0fef | Shikhar Bhushan | |
85 | ea04739a | Shikhar Bhushan | class Listener(object): |
86 | 2bfd0fef | Shikhar Bhushan | |
87 | 4f748648 | Shikhar Bhushan | "TODO: docstring"
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88 | 4f748648 | Shikhar Bhushan | |
89 | 4f748648 | Shikhar Bhushan | def callback(self, root, raw): |
90 | 2bfd0fef | Shikhar Bhushan | raise NotImplementedError |
91 | 2bfd0fef | Shikhar Bhushan | |
92 | 2bfd0fef | Shikhar Bhushan | def errback(self, err): |
93 | 2bfd0fef | Shikhar Bhushan | raise NotImplementedError |