405 lines
12 KiB
Python
405 lines
12 KiB
Python
from __future__ import with_statement, unicode_literals
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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 . import statemachine
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from . stanzabase import StanzaBase
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from xml.etree import cElementTree
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from xml.parsers import expat
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import logging
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import socket
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import threading
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import time
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import traceback
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import types
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import xml.sax.saxutils
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HANDLER_THREADS = 1
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ssl_support = True
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#try:
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import ssl
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#except ImportError:
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# ssl_support = False
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import sys
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if sys.version_info < (3, 0):
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#monkey patch broken filesocket object
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from . import filesocket
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socket._fileobject = filesocket.filesocket
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class RestartStream(Exception):
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pass
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class CloseStream(Exception):
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pass
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stanza_extensions = {}
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class XMLStream(object):
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"A connection manager with XML events."
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def __init__(self, socket=None, host='', port=0, escape_quotes=False):
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global ssl_support
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self.ssl_support = ssl_support
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self.escape_quotes = escape_quotes
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self.state = statemachine.StateMachine()
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self.state.addStates({'connected':False, 'is client':False, 'ssl':False, 'tls':False, 'reconnect':True, 'processing':False}) #set initial states
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self.setSocket(socket)
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self.address = (host, int(port))
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self.__thread = {}
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self.__root_stanza = []
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self.__stanza = {}
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self.__stanza_extension = {}
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self.__handlers = []
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self.__tls_socket = None
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self.filesocket = None
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self.use_ssl = False
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self.use_tls = False
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self.stream_header = "<stream>"
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self.stream_footer = "</stream>"
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self.eventqueue = queue.Queue()
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self.namespace_map = {}
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self.run = True
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def setSocket(self, socket):
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"Set the socket"
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self.socket = socket
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if socket is not None:
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self.filesocket = socket.makefile('rb', 0) # ElementTree.iterparse requires a file. 0 buffer files have to be binary
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self.state.set('connected', True)
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def setFileSocket(self, filesocket):
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self.filesocket = filesocket
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def connect(self, host='', port=0, use_ssl=False, use_tls=True):
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"Link to connectTCP"
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return self.connectTCP(host, port, use_ssl, use_tls)
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def connectTCP(self, host='', port=0, use_ssl=None, use_tls=None, reattempt=True):
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"Connect and create socket"
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while reattempt and not self.state['connected']:
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if host and port:
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self.address = (host, int(port))
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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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self.state.set('is client', True)
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.socket.settimeout(None)
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if self.use_ssl and self.ssl_support:
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logging.debug("Socket Wrapped for SSL")
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self.socket = ssl.wrap_socket(self.socket)
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try:
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self.socket.connect(self.address)
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#self.filesocket = self.socket.makefile('rb', 0)
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self.filesocket = self.socket.makefile('rb', 0)
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self.state.set('connected', True)
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return True
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except socket.error as serr:
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logging.error("Could not connect. Socket Error #%s: %s" % (serr.errno, serr.strerror))
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time.sleep(1)
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def connectUnix(self, filepath):
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"Connect to Unix file and create socket"
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def startTLS(self):
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"Handshakes for TLS"
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if self.ssl_support:
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logging.info("Negotiating TLS")
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self.realsocket = self.socket
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self.socket = ssl.wrap_socket(self.socket, ssl_version=ssl.PROTOCOL_TLSv1, do_handshake_on_connect=False)
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self.socket.do_handshake()
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if sys.version_info < (3,0):
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from . filesocket import filesocket
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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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return True
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else:
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logging.warning("Tried to enable TLS, but ssl module not found.")
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return False
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raise RestartStream()
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def process(self, threaded=True):
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for t in range(0, HANDLER_THREADS):
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self.__thread['eventhandle%s' % t] = threading.Thread(name='eventhandle%s' % t, target=self._eventRunner)
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self.__thread['eventhandle%s' % t].start()
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if threaded:
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self.__thread['process'] = threading.Thread(name='process', target=self._process)
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self.__thread['process'].start()
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else:
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self._process()
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def _process(self):
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"Start processing the socket."
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firstrun = True
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while firstrun or self.state['reconnect']:
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self.state.set('processing', True)
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firstrun = False
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try:
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if self.state['is client']:
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self.sendRaw(self.stream_header)
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while self.__readXML():
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if self.state['is client']:
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self.sendRaw(self.stream_header)
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except KeyboardInterrupt:
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logging.debug("Keyboard Escape Detected")
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self.state.set('processing', False)
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self.state.set('reconnect', False)
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self.disconnect()
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self.run = False
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self.eventqueue.put(('quit', None, None))
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return
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except CloseStream:
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return
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except SystemExit:
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self.eventqueue.put(('quit', None, None))
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return
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except socket.error:
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if not self.state.reconnect:
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return
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else:
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self.state.set('processing', False)
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traceback.print_exc()
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self.disconnect(reconnect=True)
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except:
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if not self.state.reconnect:
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return
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else:
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self.state.set('processing', False)
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traceback.print_exc()
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self.disconnect(reconnect=True)
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if self.state['reconnect']:
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self.reconnect()
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self.state.set('processing', False)
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self.eventqueue.put(('quit', None, None))
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#self.__thread['readXML'] = threading.Thread(name='readXML', target=self.__readXML)
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#self.__thread['readXML'].start()
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#self.__thread['spawnEvents'] = threading.Thread(name='spawnEvents', target=self.__spawnEvents)
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#self.__thread['spawnEvents'].start()
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def __readXML(self):
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"Parses the incoming stream, adding to xmlin queue as it goes"
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#build cElementTree object from expat was we go
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#self.filesocket = self.socket.makefile('rb', 0)
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#print self.filesocket.read(1024) #self.filesocket._sock.recv(1024)
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edepth = 0
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root = None
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for (event, xmlobj) in cElementTree.iterparse(self.filesocket, (b'end', b'start')):
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if edepth == 0: # and xmlobj.tag.split('}', 1)[-1] == self.basetag:
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if event == b'start':
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root = xmlobj
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self.start_stream_handler(root)
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if event == b'end':
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edepth += -1
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if edepth == 0 and event == b'end':
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return False
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elif edepth == 1:
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#self.xmlin.put(xmlobj)
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try:
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self.__spawnEvent(xmlobj)
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except RestartStream:
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return True
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except CloseStream:
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return False
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if root:
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root.clear()
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if event == b'start':
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edepth += 1
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def sendRaw(self, data):
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logging.debug("SEND: %s" % data)
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try:
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self.socket.send(bytes(data, "utf-8"))
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except TypeError:
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self.socket.send(bytes(data))
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#except socket.error,(errno, strerror):
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except:
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self.state.set('connected', False)
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if self.state.reconnect:
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logging.error("Disconnected. Socket Error.")
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traceback.print_exc()
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self.disconnect(reconnect=True)
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return False
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return True
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def disconnect(self, reconnect=False):
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self.state.set('reconnect', reconnect)
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if self.state['connected']:
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self.sendRaw(self.stream_footer)
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#send end of stream
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#wait for end of stream back
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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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#logging.warning("Error while disconnecting. Socket Error #%s: %s" % (errno, strerror))
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#thread.exit_thread()
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pass
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if self.state['processing']:
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#raise CloseStream
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pass
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def reconnect(self):
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self.state.set('tls',False)
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self.state.set('ssl',False)
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time.sleep(1)
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self.connect()
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def incoming_filter(self, xmlobj):
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return xmlobj
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def __spawnEvent(self, xmlobj):
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"watching xmlOut and processes handlers"
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#convert XML into Stanza
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logging.debug("RECV: %s" % cElementTree.tostring(xmlobj))
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xmlobj = self.incoming_filter(xmlobj)
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stanza = None
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for stanza_class in self.__root_stanza:
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if xmlobj.tag == "{%s}%s" % (self.default_ns, stanza_class.name):
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#if self.__root_stanza[stanza_class].match(xmlobj):
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stanza = stanza_class(self, xmlobj)
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break
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if stanza is None:
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stanza = StanzaBase(self, xmlobj)
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unhandled = True
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for handler in self.__handlers:
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if handler.match(xmlobj):
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handler.prerun(stanza)
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self.eventqueue.put(('stanza', handler, stanza))
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if handler.checkDelete(): self.__handlers.pop(self.__handlers.index(handler))
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unhandled = False
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if unhandled:
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stanza.unhandled()
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#loop through handlers and test match
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#spawn threads as necessary, call handlers, sending Stanza
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def _eventRunner(self):
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logging.debug("Loading event runner")
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while self.run:
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try:
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event = self.eventqueue.get(True, timeout=5)
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except queue.Empty:
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event = None
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if event is not None:
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etype = event[0]
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handler = event[1]
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args = event[2:]
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#etype, handler, *args = event #python 3.x way
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if etype == 'stanza':
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try:
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handler.run(args[0])
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except Exception as e:
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args[0].exception(e)
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elif etype == 'sched':
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try:
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handler.run(*args)
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except:
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logging.error(traceback.format_exc())
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elif etype == 'quit':
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logging.debug("Quitting eventRunner thread")
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return False
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def registerHandler(self, handler, before=None, after=None):
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"Add handler with matcher class and parameters."
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self.__handlers.append(handler)
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def removeHandler(self, name):
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"Removes the handler."
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idx = 0
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for handler in self.__handlers:
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if handler.name == name:
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self.__handlers.pop(idx)
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return
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idx += 1
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def registerStanza(self, stanza_class):
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"Adds stanza. If root stanzas build stanzas sent in events while non-root stanzas build substanza objects."
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self.__root_stanza.append(stanza_class)
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def registerStanzaExtension(self, stanza_class, stanza_extension):
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if stanza_class not in stanza_extensions:
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stanza_extensions[stanza_class] = [stanza_extension]
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else:
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stanza_extensions[stanza_class].append(stanza_extension)
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def removeStanza(self, stanza_class, root=False):
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"Removes the stanza's registration."
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if root:
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del self.__root_stanza[stanza_class]
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else:
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del self.__stanza[stanza_class]
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def removeStanzaExtension(self, stanza_class, stanza_extension):
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stanza_extension[stanza_class].pop(stanza_extension)
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def tostring(self, xml, xmlns='', stringbuffer=''):
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newoutput = [stringbuffer]
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#TODO respect ET mapped namespaces
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itag = xml.tag.split('}', 1)[-1]
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if '}' in xml.tag:
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ixmlns = xml.tag.split('}', 1)[0][1:]
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else:
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ixmlns = ''
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nsbuffer = ''
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if xmlns != ixmlns and ixmlns != '':
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if ixmlns in self.namespace_map:
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if self.namespace_map[ixmlns] != '':
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itag = "%s:%s" % (self.namespace_map[ixmlns], itag)
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else:
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nsbuffer = """ xmlns="%s\"""" % ixmlns
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newoutput.append("<%s" % itag)
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newoutput.append(nsbuffer)
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for attrib in xml.attrib:
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newoutput.append(""" %s="%s\"""" % (attrib, self.xmlesc(xml.attrib[attrib])))
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if len(xml) or xml.text or xml.tail:
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newoutput.append(">")
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if xml.text:
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newoutput.append(self.xmlesc(xml.text))
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if len(xml):
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for child in xml.getchildren():
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newoutput.append(self.tostring(child, ixmlns))
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newoutput.append("</%s>" % (itag, ))
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if xml.tail:
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newoutput.append(self.xmlesc(xml.tail))
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elif xml.text:
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newoutput.append(">%s</%s>" % (self.xmlesc(xml.text), itag))
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else:
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newoutput.append(" />")
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return ''.join(newoutput)
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def xmlesc(self, text):
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text = list(text)
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cc = 0
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matches = ('&', '<', '"', '>', "'")
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for c in text:
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if c in matches:
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if c == '&':
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text[cc] = '&'
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elif c == '<':
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text[cc] = '<'
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elif c == '>':
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text[cc] = '>'
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elif c == "'":
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text[cc] = '''
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elif self.escape_quotes:
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text[cc] = '"'
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cc += 1
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return ''.join(text)
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def start_stream_handler(self, xml):
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"""Meant to be overridden"""
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pass
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