mirror of
https://github.com/correl/SleekXMPP.git
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5efb170e1d
If wait=True, then the disconnect call will block until the send queue has emptied. WARNING: Using wait=True when more stanzas are being added to the queue than can be processed such that the queue is never empty will cause the disconnect call to block indefinitely without actually disconnecting.
1090 lines
42 KiB
Python
1090 lines
42 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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from __future__ import with_statement, unicode_literals
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import copy
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import logging
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import signal
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import socket as Socket
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import ssl
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import sys
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import threading
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import time
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import types
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import random
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try:
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import queue
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except ImportError:
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import Queue as queue
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from sleekxmpp.thirdparty.statemachine import StateMachine
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from sleekxmpp.xmlstream import Scheduler, tostring
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from sleekxmpp.xmlstream.stanzabase import StanzaBase, ET
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from sleekxmpp.xmlstream.handler import Waiter, XMLCallback
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from sleekxmpp.xmlstream.matcher import MatchXMLMask
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# In Python 2.x, file socket objects are broken. A patched socket
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# wrapper is provided for this case in filesocket.py.
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if sys.version_info < (3, 0):
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from sleekxmpp.xmlstream.filesocket import FileSocket, Socket26
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# The time in seconds to wait before timing out waiting for response stanzas.
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RESPONSE_TIMEOUT = 10
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# The number of threads to use to handle XML stream events. This is not the
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# same as the number of custom event handling threads. HANDLER_THREADS must
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# be at least 1.
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HANDLER_THREADS = 1
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# Flag indicating if the SSL library is available for use.
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SSL_SUPPORT = True
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# Maximum time to delay between connection attempts is one hour.
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RECONNECT_MAX_DELAY = 3600
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log = logging.getLogger(__name__)
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class RestartStream(Exception):
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"""
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Exception to restart stream processing, including
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resending the stream header.
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"""
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class XMLStream(object):
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"""
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An XML stream connection manager and event dispatcher.
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The XMLStream class abstracts away the issues of establishing a
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connection with a server and sending and receiving XML "stanzas".
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A stanza is a complete XML element that is a direct child of a root
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document element. Two streams are used, one for each communication
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direction, over the same socket. Once the connection is closed, both
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streams should be complete and valid XML documents.
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Three types of events are provided to manage the stream:
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Stream -- Triggered based on received stanzas, similar in concept
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to events in a SAX XML parser.
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Custom -- Triggered manually.
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Scheduled -- Triggered based on time delays.
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Typically, stanzas are first processed by a stream event handler which
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will then trigger custom events to continue further processing,
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especially since custom event handlers may run in individual threads.
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Attributes:
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address -- The hostname and port of the server.
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default_ns -- The default XML namespace that will be applied
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to all non-namespaced stanzas.
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event_queue -- A queue of stream, custom, and scheduled
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events to be processed.
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filesocket -- A filesocket created from the main connection socket.
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Required for ElementTree.iterparse.
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namespace_map -- Optional mapping of namespaces to namespace prefixes.
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scheduler -- A scheduler object for triggering events
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after a given period of time.
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send_queue -- A queue of stanzas to be sent on the stream.
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socket -- The connection to the server.
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ssl_support -- Indicates if a SSL library is available for use.
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ssl_version -- The version of the SSL protocol to use.
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Defaults to ssl.PROTOCOL_TLSv1.
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ca_certs -- File path to a CA certificate to verify the
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server's identity.
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state -- A state machine for managing the stream's
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connection state.
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stream_footer -- The start tag and any attributes for the stream's
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root element.
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stream_header -- The closing tag of the stream's root element.
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use_ssl -- Flag indicating if SSL should be used.
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use_tls -- Flag indicating if TLS should be used.
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stop -- threading Event used to stop all threads.
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auto_reconnect -- Flag to determine whether we auto reconnect.
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reconnect_max_delay -- Maximum time to delay between connection
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attempts. Defaults to RECONNECT_MAX_DELAY,
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which is one hour.
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Methods:
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add_event_handler -- Add a handler for a custom event.
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add_handler -- Shortcut method for registerHandler.
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connect -- Connect to the given server.
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del_event_handler -- Remove a handler for a custom event.
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disconnect -- Disconnect from the server and terminate
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processing.
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event -- Trigger a custom event.
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get_id -- Return the current stream ID.
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incoming_filter -- Optionally filter stanzas before processing.
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new_id -- Generate a new, unique ID value.
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process -- Read XML stanzas from the stream and apply
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matching stream handlers.
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reconnect -- Reestablish a connection to the server.
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register_handler -- Add a handler for a stream event.
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register_stanza -- Add a new stanza object type that may appear
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as a direct child of the stream's root.
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remove_handler -- Remove a stream handler.
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remove_stanza -- Remove a stanza object type.
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schedule -- Schedule an event handler to execute after a
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given delay.
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send -- Send a stanza object on the stream.
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send_raw -- Send a raw string on the stream.
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send_xml -- Send an XML string on the stream.
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set_socket -- Set the stream's socket and generate a new
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filesocket.
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start_stream_handler -- Perform any stream initialization such
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as handshakes.
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start_tls -- Establish a TLS connection and restart
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the stream.
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"""
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def __init__(self, socket=None, host='', port=0):
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"""
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Establish a new XML stream.
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Arguments:
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socket -- Use an existing socket for the stream.
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Defaults to None to generate a new socket.
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host -- The name of the target server.
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Defaults to the empty string.
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port -- The port to use for the connection.
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Defaults to 0.
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"""
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self.ssl_support = SSL_SUPPORT
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self.ssl_version = ssl.PROTOCOL_TLSv1
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self.ca_certs = None
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self.response_timeout = RESPONSE_TIMEOUT
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self.reconnect_delay = None
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self.reconnect_max_delay = RECONNECT_MAX_DELAY
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self.state = StateMachine(('disconnected', 'connected'))
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self.state._set_state('disconnected')
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self.address = (host, int(port))
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self.filesocket = None
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self.set_socket(socket)
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if sys.version_info < (3, 0):
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self.socket_class = Socket26
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else:
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self.socket_class = Socket.socket
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self.use_ssl = False
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self.use_tls = False
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self.default_ns = ''
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self.stream_header = "<stream>"
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self.stream_footer = "</stream>"
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self.stop = threading.Event()
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self.stream_end_event = threading.Event()
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self.stream_end_event.set()
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self.session_started_event = threading.Event()
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self.event_queue = queue.Queue()
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self.send_queue = queue.Queue()
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self.__failed_send_stanza = None
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self.scheduler = Scheduler(self.event_queue, self.stop)
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self.namespace_map = {StanzaBase.xml_ns: 'xml'}
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self.__thread = {}
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self.__root_stanza = []
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self.__handlers = []
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self.__event_handlers = {}
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self.__event_handlers_lock = threading.Lock()
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self._id = 0
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self._id_lock = threading.Lock()
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self.auto_reconnect = True
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self.is_client = False
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def use_signals(self, signals=None):
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"""
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Register signal handlers for SIGHUP and SIGTERM, if possible,
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which will raise a "killed" event when the application is
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terminated.
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If a signal handler already existed, it will be executed first,
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before the "killed" event is raised.
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Arguments:
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signals -- A list of signal names to be monitored.
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Defaults to ['SIGHUP', 'SIGTERM'].
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"""
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if signals is None:
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signals = ['SIGHUP', 'SIGTERM']
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existing_handlers = {}
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for sig_name in signals:
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if hasattr(signal, sig_name):
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sig = getattr(signal, sig_name)
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handler = signal.getsignal(sig)
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if handler:
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existing_handlers[sig] = handler
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def handle_kill(signum, frame):
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"""
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Capture kill event and disconnect cleanly after first
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spawning the "killed" event.
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"""
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if signum in existing_handlers and \
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existing_handlers[signum] != handle_kill:
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existing_handlers[signum](signum, frame)
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self.event("killed", direct=True)
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self.disconnect()
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try:
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for sig_name in signals:
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if hasattr(signal, sig_name):
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sig = getattr(signal, sig_name)
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signal.signal(sig, handle_kill)
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self.__signals_installed = True
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except:
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log.debug("Can not set interrupt signal handlers. " + \
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"SleekXMPP is not running from a main thread.")
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def new_id(self):
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"""
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Generate and return a new stream ID in hexadecimal form.
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Many stanzas, handlers, or matchers may require unique
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ID values. Using this method ensures that all new ID values
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are unique in this stream.
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"""
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with self._id_lock:
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self._id += 1
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return self.get_id()
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def get_id(self):
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"""
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Return the current unique stream ID in hexadecimal form.
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"""
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return "%X" % self._id
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def connect(self, host='', port=0, use_ssl=False,
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use_tls=True, reattempt=True):
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"""
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Create a new socket and connect to the server.
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Setting reattempt to True will cause connection attempts to be made
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every second until a successful connection is established.
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Arguments:
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host -- The name of the desired server for the connection.
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port -- Port to connect to on the server.
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use_ssl -- Flag indicating if SSL should be used.
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use_tls -- Flag indicating if TLS should be used.
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reattempt -- Flag indicating if the socket should reconnect
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after disconnections.
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"""
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if host and port:
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self.address = (host, int(port))
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self.is_client = True
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# Respect previous SSL and TLS usage directives.
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if use_ssl is not None:
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self.use_ssl = use_ssl
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if use_tls is not None:
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self.use_tls = use_tls
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# Repeatedly attempt to connect until a successful connection
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# is established.
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connected = self.state.transition('disconnected', 'connected',
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func=self._connect)
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while reattempt and not connected:
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connected = self.state.transition('disconnected', 'connected',
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func=self._connect)
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return connected
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def _connect(self):
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self.stop.clear()
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self.socket = self.socket_class(Socket.AF_INET, Socket.SOCK_STREAM)
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self.socket.settimeout(None)
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if self.reconnect_delay is None:
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delay = 1.0
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else:
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delay = min(self.reconnect_delay * 2, self.reconnect_max_delay)
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delay = random.normalvariate(delay, delay * 0.1)
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log.debug('Waiting %s seconds before connecting.' % delay)
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time.sleep(delay)
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if self.use_ssl and self.ssl_support:
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log.debug("Socket Wrapped for SSL")
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if self.ca_certs is None:
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cert_policy = ssl.CERT_NONE
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else:
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cert_policy = ssl.CERT_REQUIRED
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ssl_socket = ssl.wrap_socket(self.socket,
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ca_certs=self.ca_certs,
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cert_reqs=cert_policy)
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if hasattr(self.socket, 'socket'):
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# We are using a testing socket, so preserve the top
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# layer of wrapping.
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self.socket.socket = ssl_socket
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else:
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self.socket = ssl_socket
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try:
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log.debug("Connecting to %s:%s" % self.address)
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self.socket.connect(self.address)
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self.set_socket(self.socket, ignore=True)
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#this event is where you should set your application state
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self.event("connected", direct=True)
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self.reconnect_delay = 1.0
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return True
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except Socket.error as serr:
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error_msg = "Could not connect to %s:%s. Socket Error #%s: %s"
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self.event('socket_error', serr)
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log.error(error_msg % (self.address[0], self.address[1],
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serr.errno, serr.strerror))
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self.reconnect_delay = delay
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return False
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def disconnect(self, reconnect=False, wait=False):
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"""
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Terminate processing and close the XML streams.
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Optionally, the connection may be reconnected and
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resume processing afterwards.
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If the disconnect should take place after all items
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in the send queue have been sent, use wait=True. However,
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take note: If you are constantly adding items to the queue
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such that it is never empty, then the disconnect will
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not occur and the call will continue to block.
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Arguments:
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reconnect -- Flag indicating if the connection
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and processing should be restarted.
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Defaults to False.
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wait -- Flag indicating if the send queue should
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be emptied before disconnecting.
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"""
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self.state.transition('connected', 'disconnected', wait=0.0,
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func=self._disconnect, args=(reconnect, wait))
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def _disconnect(self, reconnect=False, wait=False):
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# Wait for the send queue to empty.
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if wait:
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self.send_queue.join()
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# Send the end of stream marker.
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self.send_raw(self.stream_footer, now=True)
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self.session_started_event.clear()
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# Wait for confirmation that the stream was
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# closed in the other direction.
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self.auto_reconnect = reconnect
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self.stream_end_event.wait(4)
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if not self.auto_reconnect:
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self.stop.set()
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try:
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self.socket.close()
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self.filesocket.close()
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self.socket.shutdown(Socket.SHUT_RDWR)
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except Socket.error as serr:
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self.event('socket_error', serr)
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finally:
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#clear your application state
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self.event('session_end', direct=True)
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self.event("disconnected", direct=True)
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return True
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def reconnect(self):
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"""
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Reset the stream's state and reconnect to the server.
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"""
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log.debug("reconnecting...")
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self.state.transition('connected', 'disconnected', wait=2.0,
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func=self._disconnect, args=(True,))
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log.debug("connecting...")
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return self.state.transition('disconnected', 'connected',
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wait=2.0, func=self._connect)
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def set_socket(self, socket, ignore=False):
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"""
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Set the socket to use for the stream.
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The filesocket will be recreated as well.
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Arguments:
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socket -- The new socket to use.
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ignore -- don't set the state
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"""
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self.socket = socket
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if socket is not None:
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# ElementTree.iterparse requires a file.
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# 0 buffer files have to be binary.
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# Use the correct fileobject type based on the Python
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# version to work around a broken implementation in
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# Python 2.x.
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if sys.version_info < (3, 0):
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self.filesocket = FileSocket(self.socket)
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else:
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self.filesocket = self.socket.makefile('rb', 0)
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if not ignore:
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self.state._set_state('connected')
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def start_tls(self):
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"""
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Perform handshakes for TLS.
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If the handshake is successful, the XML stream will need
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to be restarted.
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"""
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if self.ssl_support:
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log.info("Negotiating TLS")
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log.info("Using SSL version: %s" % str(self.ssl_version))
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if self.ca_certs is None:
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cert_policy = ssl.CERT_NONE
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else:
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cert_policy = ssl.CERT_REQUIRED
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|
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ssl_socket = ssl.wrap_socket(self.socket,
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ssl_version=self.ssl_version,
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do_handshake_on_connect=False,
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ca_certs=self.ca_certs,
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cert_reqs=cert_policy)
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|
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if hasattr(self.socket, 'socket'):
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# We are using a testing socket, so preserve the top
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# layer of wrapping.
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self.socket.socket = ssl_socket
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else:
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self.socket = ssl_socket
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self.socket.do_handshake()
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self.set_socket(self.socket)
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return True
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else:
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log.warning("Tried to enable TLS, but ssl module not found.")
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return False
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|
|
def start_stream_handler(self, xml):
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"""
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|
Perform any initialization actions, such as handshakes, once the
|
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stream header has been sent.
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|
Meant to be overridden.
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|
"""
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pass
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|
|
|
def register_stanza(self, stanza_class):
|
|
"""
|
|
Add a stanza object class as a known root stanza. A root stanza is
|
|
one that appears as a direct child of the stream's root element.
|
|
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|
Stanzas that appear as substanzas of a root stanza do not need to
|
|
be registered here. That is done using register_stanza_plugin() from
|
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sleekxmpp.xmlstream.stanzabase.
|
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|
|
Stanzas that are not registered will not be converted into
|
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stanza objects, but may still be processed using handlers and
|
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matchers.
|
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|
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Arguments:
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stanza_class -- The top-level stanza object's class.
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"""
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self.__root_stanza.append(stanza_class)
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|
|
def remove_stanza(self, stanza_class):
|
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"""
|
|
Remove a stanza from being a known root stanza. A root stanza is
|
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one that appears as a direct child of the stream's root element.
|
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|
|
Stanzas that are not registered will not be converted into
|
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stanza objects, but may still be processed using handlers and
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matchers.
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|
"""
|
|
del self.__root_stanza[stanza_class]
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|
|
def add_handler(self, mask, pointer, name=None, disposable=False,
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|
threaded=False, filter=False, instream=False):
|
|
"""
|
|
A shortcut method for registering a handler using XML masks.
|
|
|
|
Arguments:
|
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mask -- An XML snippet matching the structure of the
|
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stanzas that will be passed to this handler.
|
|
pointer -- The handler function itself.
|
|
name -- A unique name for the handler. A name will
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|
be generated if one is not provided.
|
|
disposable -- Indicates if the handler should be discarded
|
|
after one use.
|
|
threaded -- Deprecated. Remains for backwards compatibility.
|
|
filter -- Deprecated. Remains for backwards compatibility.
|
|
instream -- Indicates if the handler should execute during
|
|
stream processing and not during normal event
|
|
processing.
|
|
"""
|
|
# To prevent circular dependencies, we must load the matcher
|
|
# and handler classes here.
|
|
|
|
if name is None:
|
|
name = 'add_handler_%s' % self.getNewId()
|
|
self.registerHandler(XMLCallback(name, MatchXMLMask(mask), pointer,
|
|
once=disposable, instream=instream))
|
|
|
|
def register_handler(self, handler, before=None, after=None):
|
|
"""
|
|
Add a stream event handler that will be executed when a matching
|
|
stanza is received.
|
|
|
|
Arguments:
|
|
handler -- The handler object to execute.
|
|
"""
|
|
if handler.stream is None:
|
|
self.__handlers.append(handler)
|
|
handler.stream = self
|
|
|
|
def remove_handler(self, name):
|
|
"""
|
|
Remove any stream event handlers with the given name.
|
|
|
|
Arguments:
|
|
name -- The name of the handler.
|
|
"""
|
|
idx = 0
|
|
for handler in self.__handlers:
|
|
if handler.name == name:
|
|
self.__handlers.pop(idx)
|
|
return True
|
|
idx += 1
|
|
return False
|
|
|
|
def add_event_handler(self, name, pointer,
|
|
threaded=False, disposable=False):
|
|
"""
|
|
Add a custom event handler that will be executed whenever
|
|
its event is manually triggered.
|
|
|
|
Arguments:
|
|
name -- The name of the event that will trigger
|
|
this handler.
|
|
pointer -- The function to execute.
|
|
threaded -- If set to True, the handler will execute
|
|
in its own thread. Defaults to False.
|
|
disposable -- If set to True, the handler will be
|
|
discarded after one use. Defaults to False.
|
|
"""
|
|
if not name in self.__event_handlers:
|
|
self.__event_handlers[name] = []
|
|
self.__event_handlers[name].append((pointer, threaded, disposable))
|
|
|
|
def del_event_handler(self, name, pointer):
|
|
"""
|
|
Remove a function as a handler for an event.
|
|
|
|
Arguments:
|
|
name -- The name of the event.
|
|
pointer -- The function to remove as a handler.
|
|
"""
|
|
if not name in self.__event_handlers:
|
|
return
|
|
|
|
# Need to keep handlers that do not use
|
|
# the given function pointer
|
|
def filter_pointers(handler):
|
|
return handler[0] != pointer
|
|
|
|
self.__event_handlers[name] = filter(filter_pointers,
|
|
self.__event_handlers[name])
|
|
|
|
def event_handled(self, name):
|
|
"""
|
|
Indicates if an event has any associated handlers.
|
|
|
|
Returns the number of registered handlers.
|
|
|
|
Arguments:
|
|
name -- The name of the event to check.
|
|
"""
|
|
return len(self.__event_handlers.get(name, []))
|
|
|
|
def event(self, name, data={}, direct=False):
|
|
"""
|
|
Manually trigger a custom event.
|
|
|
|
Arguments:
|
|
name -- The name of the event to trigger.
|
|
data -- Data that will be passed to each event handler.
|
|
Defaults to an empty dictionary.
|
|
direct -- Runs the event directly if True, skipping the
|
|
event queue. All event handlers will run in the
|
|
same thread.
|
|
"""
|
|
for handler in self.__event_handlers.get(name, []):
|
|
if direct:
|
|
try:
|
|
handler[0](copy.copy(data))
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg % str(handler[0]))
|
|
if hasattr(data, 'exception'):
|
|
data.exception(e)
|
|
else:
|
|
self.event_queue.put(('event', handler, copy.copy(data)))
|
|
|
|
if handler[2]:
|
|
# If the handler is disposable, we will go ahead and
|
|
# remove it now instead of waiting for it to be
|
|
# processed in the queue.
|
|
with self.__event_handlers_lock:
|
|
try:
|
|
h_index = self.__event_handlers[name].index(handler)
|
|
self.__event_handlers[name].pop(h_index)
|
|
except:
|
|
pass
|
|
|
|
def schedule(self, name, seconds, callback, args=None,
|
|
kwargs=None, repeat=False):
|
|
"""
|
|
Schedule a callback function to execute after a given delay.
|
|
|
|
Arguments:
|
|
name -- A unique name for the scheduled callback.
|
|
seconds -- The time in seconds to wait before executing.
|
|
callback -- A pointer to the function to execute.
|
|
args -- A tuple of arguments to pass to the function.
|
|
kwargs -- A dictionary of keyword arguments to pass to
|
|
the function.
|
|
repeat -- Flag indicating if the scheduled event should
|
|
be reset and repeat after executing.
|
|
"""
|
|
self.scheduler.add(name, seconds, callback, args, kwargs,
|
|
repeat, qpointer=self.event_queue)
|
|
|
|
def incoming_filter(self, xml):
|
|
"""
|
|
Filter incoming XML objects before they are processed.
|
|
|
|
Possible uses include remapping namespaces, or correcting elements
|
|
from sources with incorrect behavior.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
return xml
|
|
|
|
def send(self, data, mask=None, timeout=None, now=False):
|
|
"""
|
|
A wrapper for send_raw for sending stanza objects.
|
|
|
|
May optionally block until an expected response is received.
|
|
|
|
Arguments:
|
|
data -- The stanza object to send on the stream.
|
|
mask -- Deprecated. An XML snippet matching the structure
|
|
of the expected response. Execution will block
|
|
in this thread until the response is received
|
|
or a timeout occurs.
|
|
timeout -- Time in seconds to wait for a response before
|
|
continuing. Defaults to RESPONSE_TIMEOUT.
|
|
now -- Indicates if the send queue should be skipped,
|
|
sending the stanza immediately. Useful mainly
|
|
for stream initialization stanzas.
|
|
Defaults to False.
|
|
"""
|
|
if timeout is None:
|
|
timeout = self.response_timeout
|
|
if hasattr(mask, 'xml'):
|
|
mask = mask.xml
|
|
data = str(data)
|
|
if mask is not None:
|
|
log.warning("Use of send mask waiters is deprecated.")
|
|
wait_for = Waiter("SendWait_%s" % self.new_id(),
|
|
MatchXMLMask(mask))
|
|
self.register_handler(wait_for)
|
|
self.send_raw(data, now)
|
|
if mask is not None:
|
|
return wait_for.wait(timeout)
|
|
|
|
def send_xml(self, data, mask=None, timeout=None, now=False):
|
|
"""
|
|
Send an XML object on the stream, and optionally wait
|
|
for a response.
|
|
|
|
Arguments:
|
|
data -- The XML object to send on the stream.
|
|
mask -- Deprecated. An XML snippet matching the structure
|
|
of the expected response. Execution will block
|
|
in this thread until the response is received
|
|
or a timeout occurs.
|
|
timeout -- Time in seconds to wait for a response before
|
|
continuing. Defaults to RESPONSE_TIMEOUT.
|
|
now -- Indicates if the send queue should be skipped,
|
|
sending the stanza immediately. Useful mainly
|
|
for stream initialization stanzas.
|
|
Defaults to False.
|
|
"""
|
|
if timeout is None:
|
|
timeout = self.response_timeout
|
|
return self.send(tostring(data), mask, timeout, now)
|
|
|
|
def send_raw(self, data, now=False, reconnect=None):
|
|
"""
|
|
Send raw data across the stream.
|
|
|
|
Arguments:
|
|
data -- Any string value.
|
|
reconnect -- Indicates if the stream should be
|
|
restarted if there is an error sending
|
|
the stanza. Used mainly for testing.
|
|
Defaults to self.auto_reconnect.
|
|
"""
|
|
if now:
|
|
log.debug("SEND (IMMED): %s" % data)
|
|
try:
|
|
self.socket.send(data.encode('utf-8'))
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.warning("Failed to send %s" % data)
|
|
if reconnect is None:
|
|
reconnect = self.auto_reconnect
|
|
self.disconnect(reconnect)
|
|
else:
|
|
self.send_queue.put(data)
|
|
return True
|
|
|
|
def process(self, threaded=True):
|
|
"""
|
|
Initialize the XML streams and begin processing events.
|
|
|
|
The number of threads used for processing stream events is determined
|
|
by HANDLER_THREADS.
|
|
|
|
Arguments:
|
|
threaded -- If threaded=True then event dispatcher will run
|
|
in a separate thread, allowing for the stream to be
|
|
used in the background for another application.
|
|
Defaults to True.
|
|
|
|
Event handlers and the send queue will be threaded
|
|
regardless of this parameter's value.
|
|
"""
|
|
self.scheduler.process(threaded=True)
|
|
|
|
def start_thread(name, target):
|
|
self.__thread[name] = threading.Thread(name=name, target=target)
|
|
self.__thread[name].daemon = True
|
|
self.__thread[name].start()
|
|
|
|
for t in range(0, HANDLER_THREADS):
|
|
log.debug("Starting HANDLER THREAD")
|
|
start_thread('stream_event_handler_%s' % t, self._event_runner)
|
|
|
|
start_thread('send_thread', self._send_thread)
|
|
|
|
if threaded:
|
|
# Run the XML stream in the background for another application.
|
|
start_thread('process', self._process)
|
|
else:
|
|
self._process()
|
|
|
|
def _process(self):
|
|
"""
|
|
Start processing the XML streams.
|
|
|
|
Processing will continue after any recoverable errors
|
|
if reconnections are allowed.
|
|
"""
|
|
firstrun = True
|
|
|
|
# The body of this loop will only execute once per connection.
|
|
# Additional passes will be made only if an error occurs and
|
|
# reconnecting is permitted.
|
|
while firstrun or (self.auto_reconnect and not self.stop.isSet()):
|
|
firstrun = False
|
|
try:
|
|
if self.is_client:
|
|
self.send_raw(self.stream_header, now=True)
|
|
# The call to self.__read_xml will block and prevent
|
|
# the body of the loop from running until a disconnect
|
|
# occurs. After any reconnection, the stream header will
|
|
# be resent and processing will resume.
|
|
while not self.stop.isSet() and self.__read_xml():
|
|
# Ensure the stream header is sent for any
|
|
# new connections.
|
|
if self.is_client:
|
|
self.send_raw(self.stream_header, now=True)
|
|
except KeyboardInterrupt:
|
|
log.debug("Keyboard Escape Detected in _process")
|
|
self.stop.set()
|
|
except SystemExit:
|
|
log.debug("SystemExit in _process")
|
|
self.stop.set()
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.exception('Socket Error')
|
|
except:
|
|
if not self.stop.isSet():
|
|
log.exception('Connection error.')
|
|
if not self.stop.isSet() and self.auto_reconnect:
|
|
self.reconnect()
|
|
else:
|
|
self.event('killed', direct=True)
|
|
self.disconnect()
|
|
self.event_queue.put(('quit', None, None))
|
|
self.scheduler.run = False
|
|
|
|
def __read_xml(self):
|
|
"""
|
|
Parse the incoming XML stream, raising stream events for
|
|
each received stanza.
|
|
"""
|
|
depth = 0
|
|
root = None
|
|
try:
|
|
for (event, xml) in ET.iterparse(self.filesocket,
|
|
(b'end', b'start')):
|
|
if event == b'start':
|
|
if depth == 0:
|
|
# We have received the start of the root element.
|
|
root = xml
|
|
# Perform any stream initialization actions, such
|
|
# as handshakes.
|
|
self.stream_end_event.clear()
|
|
self.start_stream_handler(root)
|
|
depth += 1
|
|
if event == b'end':
|
|
depth -= 1
|
|
if depth == 0:
|
|
# The stream's root element has closed,
|
|
# terminating the stream.
|
|
log.debug("End of stream recieved")
|
|
self.stream_end_event.set()
|
|
return False
|
|
elif depth == 1:
|
|
# We only raise events for stanzas that are direct
|
|
# children of the root element.
|
|
try:
|
|
self.__spawn_event(xml)
|
|
except RestartStream:
|
|
return True
|
|
if root:
|
|
# Keep the root element empty of children to
|
|
# save on memory use.
|
|
root.clear()
|
|
except SyntaxError:
|
|
log.error("Error reading from XML stream.")
|
|
log.debug("Ending read XML loop")
|
|
|
|
def _build_stanza(self, xml, default_ns=None):
|
|
"""
|
|
Create a stanza object from a given XML object.
|
|
|
|
If a specialized stanza type is not found for the XML, then
|
|
a generic StanzaBase stanza will be returned.
|
|
|
|
Arguments:
|
|
xml -- The XML object to convert into a stanza object.
|
|
default_ns -- Optional default namespace to use instead of the
|
|
stream's current default namespace.
|
|
"""
|
|
if default_ns is None:
|
|
default_ns = self.default_ns
|
|
stanza_type = StanzaBase
|
|
for stanza_class in self.__root_stanza:
|
|
if xml.tag == "{%s}%s" % (default_ns, stanza_class.name) or \
|
|
xml.tag == stanza_class.tag_name():
|
|
stanza_type = stanza_class
|
|
break
|
|
stanza = stanza_type(self, xml)
|
|
return stanza
|
|
|
|
def __spawn_event(self, xml):
|
|
"""
|
|
Analyze incoming XML stanzas and convert them into stanza
|
|
objects if applicable and queue stream events to be processed
|
|
by matching handlers.
|
|
|
|
Arguments:
|
|
xml -- The XML stanza to analyze.
|
|
"""
|
|
log.debug("RECV: %s" % tostring(xml,
|
|
xmlns=self.default_ns,
|
|
stream=self))
|
|
# Apply any preprocessing filters.
|
|
xml = self.incoming_filter(xml)
|
|
|
|
# Convert the raw XML object into a stanza object. If no registered
|
|
# stanza type applies, a generic StanzaBase stanza will be used.
|
|
stanza = self._build_stanza(xml)
|
|
|
|
# Match the stanza against registered handlers. Handlers marked
|
|
# to run "in stream" will be executed immediately; the rest will
|
|
# be queued.
|
|
unhandled = True
|
|
for handler in self.__handlers:
|
|
if handler.match(stanza):
|
|
stanza_copy = copy.copy(stanza)
|
|
handler.prerun(stanza_copy)
|
|
self.event_queue.put(('stanza', handler, stanza_copy))
|
|
try:
|
|
if handler.check_delete():
|
|
self.__handlers.remove(handler)
|
|
except:
|
|
pass # not thread safe
|
|
unhandled = False
|
|
|
|
# Some stanzas require responses, such as Iq queries. A default
|
|
# handler will be executed immediately for this case.
|
|
if unhandled:
|
|
stanza.unhandled()
|
|
|
|
def _threaded_event_wrapper(self, func, args):
|
|
"""
|
|
Capture exceptions for event handlers that run
|
|
in individual threads.
|
|
|
|
Arguments:
|
|
func -- The event handler to execute.
|
|
args -- Arguments to the event handler.
|
|
"""
|
|
orig = copy.copy(args[0])
|
|
try:
|
|
func(*args)
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg % str(func))
|
|
if hasattr(orig, 'exception'):
|
|
orig.exception(e)
|
|
|
|
def _event_runner(self):
|
|
"""
|
|
Process the event queue and execute handlers.
|
|
|
|
The number of event runner threads is controlled by HANDLER_THREADS.
|
|
|
|
Stream event handlers will all execute in this thread. Custom event
|
|
handlers may be spawned in individual threads.
|
|
"""
|
|
log.debug("Loading event runner")
|
|
try:
|
|
while not self.stop.isSet():
|
|
try:
|
|
event = self.event_queue.get(True, timeout=5)
|
|
except queue.Empty:
|
|
event = None
|
|
if event is None:
|
|
continue
|
|
|
|
etype, handler = event[0:2]
|
|
args = event[2:]
|
|
orig = copy.copy(args[0])
|
|
|
|
if etype == 'stanza':
|
|
try:
|
|
handler.run(args[0])
|
|
except Exception as e:
|
|
error_msg = 'Error processing stream handler: %s'
|
|
log.exception(error_msg % handler.name)
|
|
orig.exception(e)
|
|
elif etype == 'schedule':
|
|
try:
|
|
log.debug('Scheduled event: %s' % args)
|
|
handler(*args[0])
|
|
except:
|
|
log.exception('Error processing scheduled task')
|
|
elif etype == 'event':
|
|
func, threaded, disposable = handler
|
|
orig = copy.copy(args[0])
|
|
try:
|
|
if threaded:
|
|
x = threading.Thread(
|
|
name="Event_%s" % str(func),
|
|
target=self._threaded_event_wrapper,
|
|
args=(func, args))
|
|
x.start()
|
|
else:
|
|
func(*args)
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg % str(func))
|
|
if hasattr(orig, 'exception'):
|
|
orig.exception(e)
|
|
elif etype == 'quit':
|
|
log.debug("Quitting event runner thread")
|
|
return False
|
|
except KeyboardInterrupt:
|
|
log.debug("Keyboard Escape Detected in _event_runner")
|
|
self.event('killed', direct=True)
|
|
self.disconnect()
|
|
return
|
|
except SystemExit:
|
|
self.disconnect()
|
|
self.event_queue.put(('quit', None, None))
|
|
return
|
|
|
|
def _send_thread(self):
|
|
"""
|
|
Extract stanzas from the send queue and send them on the stream.
|
|
"""
|
|
try:
|
|
while not self.stop.isSet():
|
|
self.session_started_event.wait()
|
|
if self.__failed_send_stanza is not None:
|
|
data = self.__failed_send_stanza
|
|
self.__failed_send_stanza = None
|
|
else:
|
|
try:
|
|
data = self.send_queue.get(True, 1)
|
|
except queue.Empty:
|
|
continue
|
|
log.debug("SEND: %s" % data)
|
|
try:
|
|
self.socket.send(data.encode('utf-8'))
|
|
self.send_queue.task_done()
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.warning("Failed to send %s" % data)
|
|
self.__failed_send_stanza = data
|
|
self.disconnect(self.auto_reconnect)
|
|
except KeyboardInterrupt:
|
|
log.debug("Keyboard Escape Detected in _send_thread")
|
|
self.event('killed', direct=True)
|
|
self.disconnect()
|
|
return
|
|
except SystemExit:
|
|
self.disconnect()
|
|
self.event_queue.put(('quit', None, None))
|
|
return
|
|
|
|
def exception(self, exception):
|
|
"""
|
|
Process an unknown exception.
|
|
|
|
Meant to be overridden.
|
|
|
|
Arguments:
|
|
exception -- An unhandled exception object.
|
|
"""
|
|
pass
|
|
|
|
|
|
# To comply with PEP8, method names now use underscores.
|
|
# Deprecated method names are re-mapped for backwards compatibility.
|
|
XMLStream.startTLS = XMLStream.start_tls
|
|
XMLStream.registerStanza = XMLStream.register_stanza
|
|
XMLStream.removeStanza = XMLStream.remove_stanza
|
|
XMLStream.registerHandler = XMLStream.register_handler
|
|
XMLStream.removeHandler = XMLStream.remove_handler
|
|
XMLStream.setSocket = XMLStream.set_socket
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|
XMLStream.sendRaw = XMLStream.send_raw
|
|
XMLStream.getId = XMLStream.get_id
|
|
XMLStream.getNewId = XMLStream.new_id
|
|
XMLStream.sendXML = XMLStream.send_xml
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