root / ncclient / operations / rpc.py @ 541247ba
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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 | 541247ba | Shikhar Bhushan | # Cisco does not include message-id attribute in <rpc-reply> in case of an error.
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28 | 541247ba | Shikhar Bhushan | # This is messed up however we have to deal with it.
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29 | 541247ba | Shikhar Bhushan | # So essentially, there can be only one operation at a time if we are talking to
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30 | 541247ba | Shikhar Bhushan | # a Cisco device.
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31 | e91a5349 | Shikhar Bhushan | |
32 | 5858a82c | Shikhar Bhushan | class RPC(object): |
33 | 5858a82c | Shikhar Bhushan | |
34 | 11d9e642 | Shikhar Bhushan | def __init__(self, session, async=False): |
35 | 541247ba | Shikhar Bhushan | if session.is_remote_cisco and async: |
36 | 541247ba | Shikhar Bhushan | raise UserWarning('Asynchronous mode not supported for Cisco devices') |
37 | 38a9b062 | Shikhar Bhushan | self._session = session
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38 | 1d540e60 | Shikhar Bhushan | self._async = async
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39 | 11d9e642 | Shikhar Bhushan | self._id = uuid1().urn
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40 | 5858a82c | Shikhar Bhushan | self._listener = RPCReplyListener(session)
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41 | 5858a82c | Shikhar Bhushan | self._listener.register(self._id, self) |
42 | 3e022b7b | Shikhar Bhushan | self._reply = None |
43 | 11d9e642 | Shikhar Bhushan | self._reply_event = Event()
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44 | efed7d4c | Shikhar Bhushan | |
45 | 11d9e642 | Shikhar Bhushan | def _build(self, op, encoding='utf-8'): |
46 | 5858a82c | Shikhar Bhushan | if isinstance(op, dict): |
47 | 5858a82c | Shikhar Bhushan | return self.build_from_spec(self._id, op, encoding) |
48 | 11d9e642 | Shikhar Bhushan | else:
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49 | 3e022b7b | Shikhar Bhushan | return self.build_from_string(self._id, op, encoding) |
50 | efed7d4c | Shikhar Bhushan | |
51 | e91a5349 | Shikhar Bhushan | def _request(self, op): |
52 | 5858a82c | Shikhar Bhushan | req = self._build(op)
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53 | efed7d4c | Shikhar Bhushan | self._session.send(req)
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54 | 1d540e60 | Shikhar Bhushan | if self._async: |
55 | 41e2ed46 | Shikhar Bhushan | return self._reply_event |
56 | 41e2ed46 | Shikhar Bhushan | else:
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57 | ee4bb099 | Shikhar Bhushan | self._reply_event.wait()
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58 | efed7d4c | Shikhar Bhushan | self._reply.parse()
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59 | 3e022b7b | Shikhar Bhushan | return self._reply |
60 | ee4bb099 | Shikhar Bhushan | |
61 | 41e2ed46 | Shikhar Bhushan | def _set_reply(self, raw): |
62 | 3e022b7b | Shikhar Bhushan | self._reply = RPCReply(raw)
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63 | 41e2ed46 | Shikhar Bhushan | |
64 | 41e2ed46 | Shikhar Bhushan | def _set_reply_event(self): |
65 | 3e022b7b | Shikhar Bhushan | self._reply_event.set()
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66 | ee4bb099 | Shikhar Bhushan | |
67 | 41e2ed46 | Shikhar Bhushan | def _delivery_hook(self): |
68 | 41e2ed46 | Shikhar Bhushan | 'For subclasses'
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69 | 41e2ed46 | Shikhar Bhushan | pass
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70 | 41e2ed46 | Shikhar Bhushan | |
71 | 41e2ed46 | Shikhar Bhushan | def deliver(self, raw): |
72 | 41e2ed46 | Shikhar Bhushan | self._set_reply(raw)
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73 | 41e2ed46 | Shikhar Bhushan | self._delivery_hook()
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74 | 41e2ed46 | Shikhar Bhushan | self._set_reply_event()
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75 | 41e2ed46 | Shikhar Bhushan | |
76 | 589b23e4 | Shikhar Bhushan | @property
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77 | 35ad9d81 | Shikhar Bhushan | def has_reply(self): |
78 | 3e022b7b | Shikhar Bhushan | return self._reply_event.isSet() |
79 | 589b23e4 | Shikhar Bhushan | |
80 | 589b23e4 | Shikhar Bhushan | @property
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81 | ee4bb099 | Shikhar Bhushan | def reply(self): |
82 | ee4bb099 | Shikhar Bhushan | return self._reply |
83 | ee4bb099 | Shikhar Bhushan | |
84 | ee4bb099 | Shikhar Bhushan | @property
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85 | 41e2ed46 | Shikhar Bhushan | def is_async(self): |
86 | 41e2ed46 | Shikhar Bhushan | return self._async |
87 | 41e2ed46 | Shikhar Bhushan | |
88 | 41e2ed46 | Shikhar Bhushan | @property
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89 | 38a9b062 | Shikhar Bhushan | def id(self): |
90 | ee4bb099 | Shikhar Bhushan | return self._id |
91 | ee4bb099 | Shikhar Bhushan | |
92 | ee4bb099 | Shikhar Bhushan | @property
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93 | ee4bb099 | Shikhar Bhushan | def session(self): |
94 | ee4bb099 | Shikhar Bhushan | return self._session |
95 | efed7d4c | Shikhar Bhushan | |
96 | 3e022b7b | Shikhar Bhushan | @property
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97 | 3e022b7b | Shikhar Bhushan | def reply_event(self): |
98 | 3e022b7b | Shikhar Bhushan | return self._reply_event |
99 | 3e022b7b | Shikhar Bhushan | |
100 | 11d9e642 | Shikhar Bhushan | @staticmethod
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101 | 11d9e642 | Shikhar Bhushan | def build_from_spec(msgid, opspec, encoding='utf-8'): |
102 | 11d9e642 | Shikhar Bhushan | "TODO: docstring"
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103 | 11d9e642 | Shikhar Bhushan | spec = { |
104 | 1d540e60 | Shikhar Bhushan | 'tag': _('rpc'), |
105 | 11d9e642 | Shikhar Bhushan | 'attributes': {'message-id': msgid}, |
106 | 11d9e642 | Shikhar Bhushan | 'children': opspec
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107 | 11d9e642 | Shikhar Bhushan | } |
108 | 11d9e642 | Shikhar Bhushan | return TreeBuilder(spec).to_string(encoding)
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109 | 11d9e642 | Shikhar Bhushan | |
110 | 11d9e642 | Shikhar Bhushan | @staticmethod
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111 | 11d9e642 | Shikhar Bhushan | def build_from_string(msgid, opstr, encoding='utf-8'): |
112 | 11d9e642 | Shikhar Bhushan | "TODO: docstring"
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113 | 11d9e642 | Shikhar Bhushan | decl = '<?xml version="1.0" encoding="%s"?>' % encoding
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114 | 5858a82c | Shikhar Bhushan | doc = (u'<rpc message-id="%s" xmlns="%s">%s</rpc>' %
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115 | 11d9e642 | Shikhar Bhushan | (msgid, BASE_NS, opstr)).encode(encoding) |
116 | 5858a82c | Shikhar Bhushan | return '%s%s' % (decl, doc) |
117 | 3e022b7b | Shikhar Bhushan | |
118 | 3e022b7b | Shikhar Bhushan | |
119 | 3e022b7b | Shikhar Bhushan | class RPCReplyListener(Listener): |
120 | 3e022b7b | Shikhar Bhushan | |
121 | 3e022b7b | Shikhar Bhushan | # TODO - determine if need locking
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122 | 3e022b7b | Shikhar Bhushan | |
123 | 541247ba | Shikhar Bhushan | # one instance per session
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124 | 541247ba | Shikhar Bhushan | def __new__(cls, session): |
125 | 541247ba | Shikhar Bhushan | instance = session.get_listener_instance(cls) |
126 | 3e022b7b | Shikhar Bhushan | if instance is None: |
127 | 3e022b7b | Shikhar Bhushan | instance = object.__new__(cls)
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128 | 3e022b7b | Shikhar Bhushan | instance._id2rpc = WeakValueDictionary() |
129 | 541247ba | Shikhar Bhushan | instance._cisco = session.is_remote_cisco |
130 | 3e022b7b | Shikhar Bhushan | instance._errback = None
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131 | 541247ba | Shikhar Bhushan | session.add_listener(instance) |
132 | 3e022b7b | Shikhar Bhushan | return instance
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133 | 3e022b7b | Shikhar Bhushan | |
134 | 3e022b7b | Shikhar Bhushan | def __str__(self): |
135 | 3e022b7b | Shikhar Bhushan | return 'RPCReplyListener' |
136 | 3e022b7b | Shikhar Bhushan | |
137 | 3e022b7b | Shikhar Bhushan | def set_errback(self, errback): |
138 | 3e022b7b | Shikhar Bhushan | self._errback = errback
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139 | 3e022b7b | Shikhar Bhushan | |
140 | 41e2ed46 | Shikhar Bhushan | def register(self, id, rpc): |
141 | 41e2ed46 | Shikhar Bhushan | self._id2rpc[id] = rpc |
142 | 3e022b7b | Shikhar Bhushan | |
143 | 3e022b7b | Shikhar Bhushan | def callback(self, root, raw): |
144 | 3e022b7b | Shikhar Bhushan | tag, attrs = root |
145 | 3e022b7b | Shikhar Bhushan | if __(tag) != 'rpc-reply': |
146 | 3e022b7b | Shikhar Bhushan | return
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147 | 541247ba | Shikhar Bhushan | rpc = None
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148 | 3e022b7b | Shikhar Bhushan | for key in attrs: |
149 | 3e022b7b | Shikhar Bhushan | if __(key) == 'message-id': |
150 | 3e022b7b | Shikhar Bhushan | id = attrs[key] |
151 | 3e022b7b | Shikhar Bhushan | try:
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152 | 541247ba | Shikhar Bhushan | rpc = self._id2rpc.pop(id) |
153 | 41e2ed46 | Shikhar Bhushan | except KeyError: |
154 | 541247ba | Shikhar Bhushan | logger.warning('[RPCReplyListener.callback] no object '
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155 | 3e022b7b | Shikhar Bhushan | + 'registered for message-id: [%s]' % id) |
156 | 41e2ed46 | Shikhar Bhushan | except Exception as e: |
157 | 41e2ed46 | Shikhar Bhushan | logger.debug('[RPCReplyListener.callback] error - %r' % e)
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158 | 3e022b7b | Shikhar Bhushan | break
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159 | 3e022b7b | Shikhar Bhushan | else:
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160 | 541247ba | Shikhar Bhushan | if self._cisco: |
161 | 541247ba | Shikhar Bhushan | assert(len(self._id2rpc) == 1) |
162 | 541247ba | Shikhar Bhushan | rpc = self._id2rpc.values()[0] |
163 | 541247ba | Shikhar Bhushan | self._id2rpc.clear()
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164 | 541247ba | Shikhar Bhushan | else:
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165 | 541247ba | Shikhar Bhushan | logger.warning('<rpc-reply> without message-id received: %s' % raw)
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166 | 541247ba | Shikhar Bhushan | logger.debug('[RPCReplyListener.callback] delivering to %r' % rpc)
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167 | 541247ba | Shikhar Bhushan | rpc.deliver(raw) |
168 | 3e022b7b | Shikhar Bhushan | |
169 | 3e022b7b | Shikhar Bhushan | def errback(self, err): |
170 | 3e022b7b | Shikhar Bhushan | if self._errback is not None: |
171 | 1d540e60 | Shikhar Bhushan | self._errback(err) |