1 # -----------------------------------------------------------------------
2 # Copyright (C) 2007 Georgia Public Library Service
3 # Bill Erickson <billserickson@gmail.com>
5 # This program is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU General Public License
7 # as published by the Free Software Foundation; either version 2
8 # of the License, or (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
14 # -----------------------------------------------------------------------
17 import os, time, threading
18 from pyxmpp.jabber.client import JabberClient
19 from pyxmpp.message import Message
20 from pyxmpp.jid import JID
21 from socket import gethostname
23 import osrf.log, osrf.ex
27 # - log jabber activity (for future reference)
29 #logger=logging.getLogger()
30 #logger.addHandler(logging.StreamHandler())
31 #logger.addHandler(logging.FileHandler('j.log'))
32 #logger.setLevel(logging.DEBUG)
36 class XMPPNoRecipient(osrf.ex.OSRFException):
37 ''' Raised when a message was sent to a non-existent recipient
38 The recipient is stored in the 'recipient' field on this object
40 def __init__(self, recipient):
41 osrf.ex.OSRFException.__init__(self, 'Error communicating with %s' % recipient)
42 self.recipient = recipient
44 def set_network_handle(handle):
45 """ Sets the thread-specific network handle"""
46 THREAD_SESSIONS[threading.currentThread().getName()] = handle
48 def get_network_handle():
49 """ Returns the thread-specific network connection handle."""
50 return THREAD_SESSIONS.get(threading.currentThread().getName())
52 def clear_network_handle():
53 ''' Disconnects the thread-specific handle and discards it '''
54 handle = THREAD_SESSIONS.get(threading.currentThread().getName())
57 del THREAD_SESSIONS[threading.currentThread().getName()]
59 class NetworkMessage(object):
64 sender - message sender
65 recipient - message recipient
66 body - the body of the message
67 thread - the message thread
68 locale - locale of the message
69 osrf_xid - The logging transaction ID
72 def __init__(self, message=None, **args):
74 self.body = message.get_body()
75 self.thread = message.get_thread()
76 self.recipient = message.get_to()
77 self.router_command = None
78 self.router_class = None
79 if message.xmlnode.hasProp('router_from') and \
80 message.xmlnode.prop('router_from') != '':
81 self.sender = message.xmlnode.prop('router_from')
83 self.sender = message.get_from().as_utf8()
84 if message.xmlnode.hasProp('osrf_xid'):
85 self.xid = message.xmlnode
89 self.sender = args.get('sender')
90 self.recipient = args.get('recipient')
91 self.body = args.get('body')
92 self.thread = args.get('thread')
93 self.router_command = args.get('router_command')
94 self.router_class = args.get('router_class')
95 self.xid = osrf.log.get_xid()
99 doc = libxml2.parseDoc(xml)
100 msg = Message(doc.getRootElement())
101 return NetworkMessage(msg)
104 def make_xmpp_msg(self):
105 ''' Creates a pyxmpp.message.Message and adds custom attributes '''
107 msg = Message(None, self.sender, self.recipient, None, None, None, \
108 self.body, self.thread)
109 if self.router_command:
110 msg.xmlnode.newProp('router_command', self.router_command)
111 if self.router_class:
112 msg.xmlnode.newProp('router_class', self.router_class)
114 msg.xmlnode.newProp('osrf_xid', self.xid)
118 ''' Turns this message into XML '''
119 return self.make_xmpp_msg().serialize()
122 class Network(JabberClient):
123 def __init__(self, **args):
124 self.isconnected = False
126 # Create a unique jabber resource
127 resource = args.get('resource') or 'python_client'
128 resource += '_' + gethostname() + ':' + str(os.getpid()) + '_' + \
129 threading.currentThread().getName().lower()
130 self.jid = JID(args['username'], args['host'], resource)
132 osrf.log.log_debug("initializing network with JID %s and host=%s, "
133 "port=%s, username=%s" % (self.jid.as_utf8(), args['host'], \
134 args['port'], args['username']))
136 #initialize the superclass
137 JabberClient.__init__(self, self.jid, args['password'], args['host'])
140 self.receive_callback = None
141 self.transport_error_msg = None
144 JabberClient.connect(self)
145 while not self.isconnected:
146 stream = self.get_stream()
147 act = stream.loop_iter(10)
151 def set_receive_callback(self, func):
152 """The callback provided is called when a message is received.
154 The only argument to the function is the received message. """
155 self.receive_callback = func
157 def session_started(self):
158 osrf.log.log_info("Successfully connected to the opensrf network")
160 self.stream.set_message_handler("normal", self.message_received)
161 self.stream.set_message_handler("error", self.error_received)
162 self.isconnected = True
164 def send(self, message):
165 """Sends the provided network message."""
166 osrf.log.log_internal("jabber sending to %s: %s" % (message.recipient, message.body))
167 message.sender = self.jid.as_utf8()
168 msg = message.make_xmpp_msg()
169 self.stream.send(msg)
171 def error_received(self, stanza):
172 self.transport_error_msg = NetworkMessage(stanza)
173 osrf.log.log_error("XMPP error message received from %s" % self.transport_error_msg.sender)
175 def message_received(self, stanza):
176 """Handler for received messages."""
177 if stanza.get_type()=="headline":
180 osrf.log.log_internal("jabber received message from %s : %s"
181 % (stanza.get_from().as_utf8(), stanza.get_body()))
182 self.queue.append(NetworkMessage(stanza))
185 def recv(self, timeout=120):
186 """Attempts to receive a message from the network.
188 timeout - max number of seconds to wait for a message.
189 If a message is received in 'timeout' seconds, the message is passed to
190 the receive_callback is called and True is returned. Otherwise, false is
199 if len(self.queue) == 0:
200 while (forever or timeout >= 0) and len(self.queue) == 0:
201 starttime = time.time()
202 act = self.get_stream().loop_iter(timeout)
203 endtime = time.time() - starttime
206 osrf.log.log_internal("exiting stream loop after %s seconds. "
207 "act=%s, queue size=%d" % (str(endtime), act, len(self.queue)))
209 if self.transport_error_msg:
210 msg = self.transport_error_msg
211 self.transport_error_msg = None
212 raise XMPPNoRecipient(msg.sender)
217 # if we've acquired a message, handle it
219 if len(self.queue) > 0:
220 msg = self.queue.pop(0)
221 if self.receive_callback:
222 self.receive_callback(msg)