root / ncclient / transport / session.py @ 583c11f6
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1 | d095a59e | Shikhar Bhushan | # Copyright 2009 Shikhar Bhushan
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2 | d095a59e | Shikhar Bhushan | #
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3 | d095a59e | Shikhar Bhushan | # Licensed under the Apache License, Version 2.0 (the "License");
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4 | d095a59e | Shikhar Bhushan | # you may not use this file except in compliance with the License.
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5 | d095a59e | Shikhar Bhushan | # You may obtain a copy of the License at
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6 | d095a59e | Shikhar Bhushan | #
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7 | d095a59e | Shikhar Bhushan | # http://www.apache.org/licenses/LICENSE-2.0
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8 | d095a59e | Shikhar Bhushan | #
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9 | d095a59e | Shikhar Bhushan | # Unless required by applicable law or agreed to in writing, software
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10 | d095a59e | Shikhar Bhushan | # distributed under the License is distributed on an "AS IS" BASIS,
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11 | d095a59e | Shikhar Bhushan | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 | d095a59e | Shikhar Bhushan | # See the License for the specific language governing permissions and
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13 | d095a59e | Shikhar Bhushan | # limitations under the License.
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14 | d095a59e | Shikhar Bhushan | |
15 | d6688264 | Shikhar Bhushan | from Queue import Queue |
16 | 4de03d63 | Shikhar Bhushan | from threading import Thread, Lock, Event |
17 | e91a5349 | Shikhar Bhushan | |
18 | 583c11f6 | Shikhar Bhushan | from ncclient import content |
19 | 2f8bc438 | Shikhar Bhushan | from ncclient.capabilities import Capabilities |
20 | d095a59e | Shikhar Bhushan | |
21 | 41e2ed46 | Shikhar Bhushan | import logging |
22 | 41e2ed46 | Shikhar Bhushan | logger = logging.getLogger('ncclient.transport.session')
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23 | 41e2ed46 | Shikhar Bhushan | |
24 | a14c36f9 | Shikhar Bhushan | class Session(Thread): |
25 | d095a59e | Shikhar Bhushan | |
26 | 2f8bc438 | Shikhar Bhushan | def __init__(self, capabilities): |
27 | a14c36f9 | Shikhar Bhushan | Thread.__init__(self)
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28 | 583c11f6 | Shikhar Bhushan | self.set_daemon(True) |
29 | 583c11f6 | Shikhar Bhushan | self._listeners = set() # 3.0's weakset ideal |
30 | a14c36f9 | Shikhar Bhushan | self._lock = Lock()
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31 | 583c11f6 | Shikhar Bhushan | self.set_name('session') |
32 | d6688264 | Shikhar Bhushan | self._q = Queue()
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33 | 2f8bc438 | Shikhar Bhushan | self._client_capabilities = capabilities
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34 | d095a59e | Shikhar Bhushan | self._server_capabilities = None # yet |
35 | d095a59e | Shikhar Bhushan | self._id = None # session-id |
36 | d095a59e | Shikhar Bhushan | self._connected = False # to be set/cleared by subclass implementation |
37 | 41e2ed46 | Shikhar Bhushan | logger.debug('%r created: client_capabilities=%r' %
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38 | 41e2ed46 | Shikhar Bhushan | (self, self._client_capabilities)) |
39 | d095a59e | Shikhar Bhushan | |
40 | a14c36f9 | Shikhar Bhushan | def _dispatch_message(self, raw): |
41 | a14c36f9 | Shikhar Bhushan | "TODO: docstring"
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42 | a14c36f9 | Shikhar Bhushan | try:
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43 | 583c11f6 | Shikhar Bhushan | root = content.parse_root(raw) |
44 | a14c36f9 | Shikhar Bhushan | except Exception as e: |
45 | a14c36f9 | Shikhar Bhushan | logger.error('error parsing dispatch message: %s' % e)
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46 | a14c36f9 | Shikhar Bhushan | return
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47 | a14c36f9 | Shikhar Bhushan | with self._lock: |
48 | a14c36f9 | Shikhar Bhushan | listeners = list(self._listeners) |
49 | a14c36f9 | Shikhar Bhushan | for l in listeners: |
50 | a14c36f9 | Shikhar Bhushan | logger.debug('dispatching message to %r' % l)
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51 | a14c36f9 | Shikhar Bhushan | try:
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52 | a14c36f9 | Shikhar Bhushan | l.callback(root, raw) |
53 | a14c36f9 | Shikhar Bhushan | except Exception as e: |
54 | a14c36f9 | Shikhar Bhushan | logger.warning('[error] %r' % e)
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55 | a14c36f9 | Shikhar Bhushan | |
56 | a14c36f9 | Shikhar Bhushan | def _dispatch_error(self, err): |
57 | a14c36f9 | Shikhar Bhushan | "TODO: docstring"
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58 | a14c36f9 | Shikhar Bhushan | with self._lock: |
59 | a14c36f9 | Shikhar Bhushan | listeners = list(self._listeners) |
60 | a14c36f9 | Shikhar Bhushan | for l in listeners: |
61 | a14c36f9 | Shikhar Bhushan | logger.debug('dispatching error to %r' % l)
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62 | a14c36f9 | Shikhar Bhushan | try:
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63 | a14c36f9 | Shikhar Bhushan | l.errback(err) |
64 | a14c36f9 | Shikhar Bhushan | except Exception as e: |
65 | a14c36f9 | Shikhar Bhushan | logger.warning('error %r' % e)
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66 | a14c36f9 | Shikhar Bhushan | |
67 | 65c6a607 | Shikhar Bhushan | def _post_connect(self): |
68 | 65c6a607 | Shikhar Bhushan | "Greeting stuff"
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69 | 65c6a607 | Shikhar Bhushan | init_event = Event() |
70 | 65c6a607 | Shikhar Bhushan | error = [None] # so that err_cb can bind error[0]. just how it is. |
71 | 65c6a607 | Shikhar Bhushan | # callbacks
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72 | 65c6a607 | Shikhar Bhushan | def ok_cb(id, capabilities): |
73 | 65c6a607 | Shikhar Bhushan | self._id = id |
74 | 583c11f6 | Shikhar Bhushan | self._server_capabilities = capabilities
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75 | 65c6a607 | Shikhar Bhushan | init_event.set() |
76 | 65c6a607 | Shikhar Bhushan | def err_cb(err): |
77 | 65c6a607 | Shikhar Bhushan | error[0] = err
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78 | 65c6a607 | Shikhar Bhushan | init_event.set() |
79 | 65c6a607 | Shikhar Bhushan | listener = HelloHandler(ok_cb, err_cb) |
80 | 65c6a607 | Shikhar Bhushan | self.add_listener(listener)
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81 | 65c6a607 | Shikhar Bhushan | self.send(HelloHandler.build(self._client_capabilities)) |
82 | 65c6a607 | Shikhar Bhushan | logger.debug('starting main loop')
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83 | 65c6a607 | Shikhar Bhushan | self.start()
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84 | 65c6a607 | Shikhar Bhushan | # we expect server's hello message
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85 | 65c6a607 | Shikhar Bhushan | init_event.wait() |
86 | 65c6a607 | Shikhar Bhushan | # received hello message or an error happened
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87 | 65c6a607 | Shikhar Bhushan | self.remove_listener(listener)
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88 | 65c6a607 | Shikhar Bhushan | if error[0]: |
89 | 65c6a607 | Shikhar Bhushan | raise error[0] |
90 | 65c6a607 | Shikhar Bhushan | logger.info('initialized: session-id=%s | server_capabilities=%s' %
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91 | 65c6a607 | Shikhar Bhushan | (self._id, self._server_capabilities)) |
92 | 65c6a607 | Shikhar Bhushan | |
93 | a14c36f9 | Shikhar Bhushan | def add_listener(self, listener): |
94 | a14c36f9 | Shikhar Bhushan | logger.debug('installing listener %r' % listener)
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95 | 583c11f6 | Shikhar Bhushan | if not isinstance(listener, SessionListener): |
96 | 583c11f6 | Shikhar Bhushan | raise SessionError("Listener must be a SessionListener type") |
97 | a14c36f9 | Shikhar Bhushan | with self._lock: |
98 | a14c36f9 | Shikhar Bhushan | self._listeners.add(listener)
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99 | a14c36f9 | Shikhar Bhushan | |
100 | a14c36f9 | Shikhar Bhushan | def remove_listener(self, listener): |
101 | a14c36f9 | Shikhar Bhushan | logger.debug('discarding listener %r' % listener)
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102 | a14c36f9 | Shikhar Bhushan | with self._lock: |
103 | a14c36f9 | Shikhar Bhushan | self._listeners.discard(listener)
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104 | a14c36f9 | Shikhar Bhushan | |
105 | a14c36f9 | Shikhar Bhushan | def get_listener_instance(self, cls): |
106 | a14c36f9 | Shikhar Bhushan | with self._lock: |
107 | a14c36f9 | Shikhar Bhushan | for listener in self._listeners: |
108 | a14c36f9 | Shikhar Bhushan | if isinstance(listener, cls): |
109 | a14c36f9 | Shikhar Bhushan | return listener
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110 | a14c36f9 | Shikhar Bhushan | |
111 | 6625258b | Shikhar Bhushan | def connect(self, *args, **kwds): |
112 | d095a59e | Shikhar Bhushan | raise NotImplementedError |
113 | d095a59e | Shikhar Bhushan | |
114 | d095a59e | Shikhar Bhushan | def run(self): |
115 | d095a59e | Shikhar Bhushan | raise NotImplementedError |
116 | d095a59e | Shikhar Bhushan | |
117 | d6688264 | Shikhar Bhushan | def send(self, message): |
118 | d6688264 | Shikhar Bhushan | logger.debug('queueing %s' % message)
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119 | d6688264 | Shikhar Bhushan | self._q.put(message)
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120 | d6688264 | Shikhar Bhushan | |
121 | d095a59e | Shikhar Bhushan | ### Properties
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122 | d095a59e | Shikhar Bhushan | |
123 | d095a59e | Shikhar Bhushan | @property
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124 | d095a59e | Shikhar Bhushan | def client_capabilities(self): |
125 | d095a59e | Shikhar Bhushan | return self._client_capabilities |
126 | d095a59e | Shikhar Bhushan | |
127 | d095a59e | Shikhar Bhushan | @property
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128 | d095a59e | Shikhar Bhushan | def server_capabilities(self): |
129 | d095a59e | Shikhar Bhushan | return self._server_capabilities |
130 | d095a59e | Shikhar Bhushan | |
131 | d095a59e | Shikhar Bhushan | @property
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132 | d095a59e | Shikhar Bhushan | def connected(self): |
133 | d095a59e | Shikhar Bhushan | return self._connected |
134 | d095a59e | Shikhar Bhushan | |
135 | d095a59e | Shikhar Bhushan | @property
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136 | d095a59e | Shikhar Bhushan | def id(self): |
137 | 583c11f6 | Shikhar Bhushan | "`session-id` if session is initialized, :const:`None` otherwise"
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138 | d095a59e | Shikhar Bhushan | return self._id |
139 | 94803aaf | Shikhar Bhushan | |
140 | 94803aaf | Shikhar Bhushan | @property
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141 | 94803aaf | Shikhar Bhushan | def can_pipeline(self): |
142 | 94803aaf | Shikhar Bhushan | return True |
143 | 583c11f6 | Shikhar Bhushan | |
144 | 583c11f6 | Shikhar Bhushan | |
145 | 583c11f6 | Shikhar Bhushan | class SessionListener(object): |
146 | 583c11f6 | Shikhar Bhushan | |
147 | 583c11f6 | Shikhar Bhushan | def callback(self, root, raw): |
148 | 583c11f6 | Shikhar Bhushan | raise NotImplementedError |
149 | 583c11f6 | Shikhar Bhushan | |
150 | 583c11f6 | Shikhar Bhushan | def errback(self, ex): |
151 | 583c11f6 | Shikhar Bhushan | raise NotImplementedError |
152 | 583c11f6 | Shikhar Bhushan | |
153 | 583c11f6 | Shikhar Bhushan | |
154 | 583c11f6 | Shikhar Bhushan | class HelloHandler(SessionListener): |
155 | 583c11f6 | Shikhar Bhushan | |
156 | 583c11f6 | Shikhar Bhushan | def __init__(self, init_cb, error_cb): |
157 | 583c11f6 | Shikhar Bhushan | self._init_cb = init_cb
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158 | 583c11f6 | Shikhar Bhushan | self._error_cb = error_cb
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159 | 583c11f6 | Shikhar Bhushan | |
160 | 583c11f6 | Shikhar Bhushan | def callback(self, root, raw): |
161 | 583c11f6 | Shikhar Bhushan | if content.unqualify(root[0]) == 'hello': |
162 | 583c11f6 | Shikhar Bhushan | try:
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163 | 583c11f6 | Shikhar Bhushan | id, capabilities = HelloHandler.parse(raw)
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164 | 583c11f6 | Shikhar Bhushan | except Exception as e: |
165 | 583c11f6 | Shikhar Bhushan | self._error_cb(e)
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166 | 583c11f6 | Shikhar Bhushan | else:
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167 | 583c11f6 | Shikhar Bhushan | self._init_cb(id, capabilities) |
168 | 583c11f6 | Shikhar Bhushan | |
169 | 583c11f6 | Shikhar Bhushan | def errback(self, err): |
170 | 583c11f6 | Shikhar Bhushan | self._error_cb(err)
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171 | 583c11f6 | Shikhar Bhushan | |
172 | 583c11f6 | Shikhar Bhushan | @staticmethod
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173 | 583c11f6 | Shikhar Bhushan | def build(capabilities): |
174 | 583c11f6 | Shikhar Bhushan | "Given a list of capability URI's returns <hello> message XML string"
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175 | 583c11f6 | Shikhar Bhushan | spec = { |
176 | 583c11f6 | Shikhar Bhushan | 'tag': content.qualify('hello'), |
177 | 583c11f6 | Shikhar Bhushan | 'subtree': [{
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178 | 583c11f6 | Shikhar Bhushan | 'tag': 'capabilities', |
179 | 583c11f6 | Shikhar Bhushan | 'subtree': # this is fun :-) |
180 | 583c11f6 | Shikhar Bhushan | [{'tag': 'capability', 'text': uri} for uri in capabilities] |
181 | 583c11f6 | Shikhar Bhushan | }] |
182 | 583c11f6 | Shikhar Bhushan | } |
183 | 583c11f6 | Shikhar Bhushan | return content.dtree2xml(spec)
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184 | 583c11f6 | Shikhar Bhushan | |
185 | 583c11f6 | Shikhar Bhushan | @staticmethod
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186 | 583c11f6 | Shikhar Bhushan | def parse(raw): |
187 | 583c11f6 | Shikhar Bhushan | "Returns tuple of (session-id (str), capabilities (Capabilities)"
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188 | 583c11f6 | Shikhar Bhushan | sid, capabilities = 0, []
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189 | 583c11f6 | Shikhar Bhushan | root = content.xml2ele(raw) |
190 | 583c11f6 | Shikhar Bhushan | for child in root.getchildren(): |
191 | 583c11f6 | Shikhar Bhushan | tag = content.unqualify(child.tag) |
192 | 583c11f6 | Shikhar Bhushan | if tag == 'session-id': |
193 | 583c11f6 | Shikhar Bhushan | sid = child.text |
194 | 583c11f6 | Shikhar Bhushan | elif tag == 'capabilities': |
195 | 583c11f6 | Shikhar Bhushan | for cap in child.getchildren(): |
196 | 583c11f6 | Shikhar Bhushan | if content.unqualify(cap.tag) == 'capability': |
197 | 583c11f6 | Shikhar Bhushan | capabilities.append(cap.text) |
198 | 583c11f6 | Shikhar Bhushan | return sid, Capabilities(capabilities) |