root / ncclient / operations / rpc.py @ 1fca349b
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1 | 589b23e4 | Shikhar Bhushan | # Copyright 2009 Shikhar Bhushan
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2 | 589b23e4 | Shikhar Bhushan | #
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3 | 589b23e4 | Shikhar Bhushan | # Licensed under the Apache License, Version 2.0 (the "License");
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4 | 589b23e4 | Shikhar Bhushan | # you may not use this file except in compliance with the License.
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5 | 589b23e4 | Shikhar Bhushan | # You may obtain a copy of the License at
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6 | 589b23e4 | Shikhar Bhushan | #
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7 | 589b23e4 | Shikhar Bhushan | # http://www.apache.org/licenses/LICENSE-2.0
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8 | 589b23e4 | Shikhar Bhushan | #
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9 | 589b23e4 | Shikhar Bhushan | # Unless required by applicable law or agreed to in writing, software
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10 | 589b23e4 | Shikhar Bhushan | # distributed under the License is distributed on an "AS IS" BASIS,
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11 | 589b23e4 | Shikhar Bhushan | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 | 589b23e4 | Shikhar Bhushan | # See the License for the specific language governing permissions and
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13 | 589b23e4 | Shikhar Bhushan | # limitations under the License.
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14 | 589b23e4 | Shikhar Bhushan | |
15 | 38a9b062 | Shikhar Bhushan | from threading import Event, Lock |
16 | 38a9b062 | Shikhar Bhushan | from uuid import uuid1 |
17 | 1d540e60 | Shikhar Bhushan | from weakref import WeakValueDictionary |
18 | 38a9b062 | Shikhar Bhushan | |
19 | 1d540e60 | Shikhar Bhushan | from ncclient.content import TreeBuilder |
20 | 1d540e60 | Shikhar Bhushan | from ncclient.content import qualify as _ |
21 | 1d540e60 | Shikhar Bhushan | from ncclient.content import unqualify as __ |
22 | 3e022b7b | Shikhar Bhushan | from ncclient.glue import Listener |
23 | 3e022b7b | Shikhar Bhushan | |
24 | 3e022b7b | Shikhar Bhushan | from . import logger
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25 | 3e022b7b | Shikhar Bhushan | from reply import RPCReply |
26 | 3e022b7b | Shikhar Bhushan | |
27 | 1fca349b | Shikhar Bhushan | |
28 | 541247ba | Shikhar Bhushan | # Cisco does not include message-id attribute in <rpc-reply> in case of an error.
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29 | 541247ba | Shikhar Bhushan | # This is messed up however we have to deal with it.
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30 | 541247ba | Shikhar Bhushan | # So essentially, there can be only one operation at a time if we are talking to
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31 | 541247ba | Shikhar Bhushan | # a Cisco device.
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32 | e91a5349 | Shikhar Bhushan | |
33 | 1fca349b | Shikhar Bhushan | def cisco_check(session): |
34 | 1fca349b | Shikhar Bhushan | try:
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35 | 1fca349b | Shikhar Bhushan | return session.is_remote_cisco
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36 | 1fca349b | Shikhar Bhushan | except AttributeError: |
37 | 1fca349b | Shikhar Bhushan | return False |
38 | 1fca349b | Shikhar Bhushan | |
39 | 5858a82c | Shikhar Bhushan | class RPC(object): |
40 | 5858a82c | Shikhar Bhushan | |
41 | 11d9e642 | Shikhar Bhushan | def __init__(self, session, async=False): |
42 | 1fca349b | Shikhar Bhushan | if cisco_check(session) and async: |
43 | 541247ba | Shikhar Bhushan | raise UserWarning('Asynchronous mode not supported for Cisco devices') |
44 | 38a9b062 | Shikhar Bhushan | self._session = session
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45 | 1d540e60 | Shikhar Bhushan | self._async = async
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46 | 11d9e642 | Shikhar Bhushan | self._id = uuid1().urn
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47 | 5858a82c | Shikhar Bhushan | self._listener = RPCReplyListener(session)
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48 | 5858a82c | Shikhar Bhushan | self._listener.register(self._id, self) |
49 | 3e022b7b | Shikhar Bhushan | self._reply = None |
50 | 11d9e642 | Shikhar Bhushan | self._reply_event = Event()
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51 | efed7d4c | Shikhar Bhushan | |
52 | 11d9e642 | Shikhar Bhushan | def _build(self, op, encoding='utf-8'): |
53 | 5858a82c | Shikhar Bhushan | if isinstance(op, dict): |
54 | 5858a82c | Shikhar Bhushan | return self.build_from_spec(self._id, op, encoding) |
55 | 11d9e642 | Shikhar Bhushan | else:
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56 | 3e022b7b | Shikhar Bhushan | return self.build_from_string(self._id, op, encoding) |
57 | efed7d4c | Shikhar Bhushan | |
58 | e91a5349 | Shikhar Bhushan | def _request(self, op): |
59 | 5858a82c | Shikhar Bhushan | req = self._build(op)
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60 | efed7d4c | Shikhar Bhushan | self._session.send(req)
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61 | 1d540e60 | Shikhar Bhushan | if self._async: |
62 | 41e2ed46 | Shikhar Bhushan | return self._reply_event |
63 | 41e2ed46 | Shikhar Bhushan | else:
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64 | ee4bb099 | Shikhar Bhushan | self._reply_event.wait()
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65 | efed7d4c | Shikhar Bhushan | self._reply.parse()
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66 | 3e022b7b | Shikhar Bhushan | return self._reply |
67 | ee4bb099 | Shikhar Bhushan | |
68 | 41e2ed46 | Shikhar Bhushan | def _delivery_hook(self): |
69 | 41e2ed46 | Shikhar Bhushan | 'For subclasses'
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70 | 41e2ed46 | Shikhar Bhushan | pass
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71 | 41e2ed46 | Shikhar Bhushan | |
72 | 41e2ed46 | Shikhar Bhushan | def deliver(self, raw): |
73 | 6a10f112 | Shikhar Bhushan | self._reply = RPCReply(raw)
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74 | 41e2ed46 | Shikhar Bhushan | self._delivery_hook()
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75 | 6a10f112 | Shikhar Bhushan | self._reply_event.set()
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76 | 41e2ed46 | Shikhar Bhushan | |
77 | 589b23e4 | Shikhar Bhushan | @property
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78 | 35ad9d81 | Shikhar Bhushan | def has_reply(self): |
79 | 3e022b7b | Shikhar Bhushan | return self._reply_event.isSet() |
80 | 589b23e4 | Shikhar Bhushan | |
81 | 589b23e4 | Shikhar Bhushan | @property
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82 | ee4bb099 | Shikhar Bhushan | def reply(self): |
83 | ee4bb099 | Shikhar Bhushan | return self._reply |
84 | ee4bb099 | Shikhar Bhushan | |
85 | ee4bb099 | Shikhar Bhushan | @property
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86 | 41e2ed46 | Shikhar Bhushan | def is_async(self): |
87 | 41e2ed46 | Shikhar Bhushan | return self._async |
88 | 41e2ed46 | Shikhar Bhushan | |
89 | 41e2ed46 | Shikhar Bhushan | @property
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90 | 38a9b062 | Shikhar Bhushan | def id(self): |
91 | ee4bb099 | Shikhar Bhushan | return self._id |
92 | ee4bb099 | Shikhar Bhushan | |
93 | ee4bb099 | Shikhar Bhushan | @property
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94 | ee4bb099 | Shikhar Bhushan | def session(self): |
95 | ee4bb099 | Shikhar Bhushan | return self._session |
96 | efed7d4c | Shikhar Bhushan | |
97 | 3e022b7b | Shikhar Bhushan | @property
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98 | 3e022b7b | Shikhar Bhushan | def reply_event(self): |
99 | 3e022b7b | Shikhar Bhushan | return self._reply_event |
100 | 3e022b7b | Shikhar Bhushan | |
101 | 11d9e642 | Shikhar Bhushan | @staticmethod
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102 | 11d9e642 | Shikhar Bhushan | def build_from_spec(msgid, opspec, encoding='utf-8'): |
103 | 11d9e642 | Shikhar Bhushan | "TODO: docstring"
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104 | 11d9e642 | Shikhar Bhushan | spec = { |
105 | 1d540e60 | Shikhar Bhushan | 'tag': _('rpc'), |
106 | 11d9e642 | Shikhar Bhushan | 'attributes': {'message-id': msgid}, |
107 | 11d9e642 | Shikhar Bhushan | 'children': opspec
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108 | 11d9e642 | Shikhar Bhushan | } |
109 | 11d9e642 | Shikhar Bhushan | return TreeBuilder(spec).to_string(encoding)
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110 | 11d9e642 | Shikhar Bhushan | |
111 | 11d9e642 | Shikhar Bhushan | @staticmethod
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112 | 11d9e642 | Shikhar Bhushan | def build_from_string(msgid, opstr, encoding='utf-8'): |
113 | 11d9e642 | Shikhar Bhushan | "TODO: docstring"
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114 | 11d9e642 | Shikhar Bhushan | decl = '<?xml version="1.0" encoding="%s"?>' % encoding
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115 | 5858a82c | Shikhar Bhushan | doc = (u'<rpc message-id="%s" xmlns="%s">%s</rpc>' %
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116 | 11d9e642 | Shikhar Bhushan | (msgid, BASE_NS, opstr)).encode(encoding) |
117 | 5858a82c | Shikhar Bhushan | return '%s%s' % (decl, doc) |
118 | 3e022b7b | Shikhar Bhushan | |
119 | 3e022b7b | Shikhar Bhushan | |
120 | 3e022b7b | Shikhar Bhushan | class RPCReplyListener(Listener): |
121 | 3e022b7b | Shikhar Bhushan | |
122 | 3e022b7b | Shikhar Bhushan | # TODO - determine if need locking
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123 | 3e022b7b | Shikhar Bhushan | |
124 | 541247ba | Shikhar Bhushan | # one instance per session
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125 | 541247ba | Shikhar Bhushan | def __new__(cls, session): |
126 | 541247ba | Shikhar Bhushan | instance = session.get_listener_instance(cls) |
127 | 3e022b7b | Shikhar Bhushan | if instance is None: |
128 | 3e022b7b | Shikhar Bhushan | instance = object.__new__(cls)
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129 | 3e022b7b | Shikhar Bhushan | instance._id2rpc = WeakValueDictionary() |
130 | 1fca349b | Shikhar Bhushan | instance._cisco = cisco_check(session) |
131 | 3e022b7b | Shikhar Bhushan | instance._errback = None
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132 | 541247ba | Shikhar Bhushan | session.add_listener(instance) |
133 | 3e022b7b | Shikhar Bhushan | return instance
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134 | 3e022b7b | Shikhar Bhushan | |
135 | 3e022b7b | Shikhar Bhushan | def __str__(self): |
136 | 3e022b7b | Shikhar Bhushan | return 'RPCReplyListener' |
137 | 3e022b7b | Shikhar Bhushan | |
138 | 3e022b7b | Shikhar Bhushan | def set_errback(self, errback): |
139 | 3e022b7b | Shikhar Bhushan | self._errback = errback
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140 | 3e022b7b | Shikhar Bhushan | |
141 | 41e2ed46 | Shikhar Bhushan | def register(self, id, rpc): |
142 | 41e2ed46 | Shikhar Bhushan | self._id2rpc[id] = rpc |
143 | 3e022b7b | Shikhar Bhushan | |
144 | 3e022b7b | Shikhar Bhushan | def callback(self, root, raw): |
145 | 3e022b7b | Shikhar Bhushan | tag, attrs = root |
146 | 3e022b7b | Shikhar Bhushan | if __(tag) != 'rpc-reply': |
147 | 3e022b7b | Shikhar Bhushan | return
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148 | 541247ba | Shikhar Bhushan | rpc = None
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149 | 3e022b7b | Shikhar Bhushan | for key in attrs: |
150 | 3e022b7b | Shikhar Bhushan | if __(key) == 'message-id': |
151 | 3e022b7b | Shikhar Bhushan | id = attrs[key] |
152 | 3e022b7b | Shikhar Bhushan | try:
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153 | 541247ba | Shikhar Bhushan | rpc = self._id2rpc.pop(id) |
154 | 41e2ed46 | Shikhar Bhushan | except KeyError: |
155 | 541247ba | Shikhar Bhushan | logger.warning('[RPCReplyListener.callback] no object '
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156 | 3e022b7b | Shikhar Bhushan | + 'registered for message-id: [%s]' % id) |
157 | 41e2ed46 | Shikhar Bhushan | except Exception as e: |
158 | 41e2ed46 | Shikhar Bhushan | logger.debug('[RPCReplyListener.callback] error - %r' % e)
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159 | 3e022b7b | Shikhar Bhushan | break
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160 | 3e022b7b | Shikhar Bhushan | else:
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161 | 541247ba | Shikhar Bhushan | if self._cisco: |
162 | 541247ba | Shikhar Bhushan | assert(len(self._id2rpc) == 1) |
163 | 541247ba | Shikhar Bhushan | rpc = self._id2rpc.values()[0] |
164 | 541247ba | Shikhar Bhushan | self._id2rpc.clear()
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165 | 541247ba | Shikhar Bhushan | else:
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166 | 541247ba | Shikhar Bhushan | logger.warning('<rpc-reply> without message-id received: %s' % raw)
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167 | 541247ba | Shikhar Bhushan | logger.debug('[RPCReplyListener.callback] delivering to %r' % rpc)
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168 | 541247ba | Shikhar Bhushan | rpc.deliver(raw) |
169 | 3e022b7b | Shikhar Bhushan | |
170 | 3e022b7b | Shikhar Bhushan | def errback(self, err): |
171 | 3e022b7b | Shikhar Bhushan | if self._errback is not None: |
172 | 1d540e60 | Shikhar Bhushan | self._errback(err) |