??? adding this file somehow failed -- jvr

Mac/Tools/IDE/Wsocket.py

+"""Async sockets, build on top of Sam Rushing's excellent async library"""
+
+import asyncore
+import socket
+from socket import AF_INET, SOCK_STREAM
+import string
+import cStringIO
+import mimetools
+import httplib
+
+
+__version__ = "0.9"
+__author__ = "jvr"
+
+BUFSIZE = 512
+
+VERBOSE = 1
+
+class Server(asyncore.dispatcher):
+	
+	"""Generic asynchronous server class"""
+	
+	def __init__(self, port, handler_class, backlog=1, host=""):
+		"""arguments:
+		- port: the port to listen to
+		- handler_class: class to handle requests
+		- backlog: backlog queue size (optional) (don't fully understand, see socket docs)
+		- host: host name (optional: can be empty to use default host name)
+		"""
+		if VERBOSE:
+			print "Starting", self.__class__.__name__
+		self.handler_class = handler_class
+		asyncore.dispatcher.__init__(self)
+		self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
+		self.bind((host, port))
+		self.listen(backlog)
+	
+	def handle_accept(self):
+		conn, addr = self.accept()
+		if VERBOSE:
+			print 'Incoming Connection from %s:%d' % addr
+		self.handler_class(conn)
+
+
+class ProxyServer(Server):
+	
+	"""Generic proxy server class"""
+	
+	def __init__(self, port, handler_class, proxyaddr=None, closepartners=0):
+		"""arguments:
+		- port: the port to listen to
+		- handler_class: proxy class to handle requests
+		- proxyaddr: a tuple containing the address and 
+		  port of a remote host to connect to (optional)
+		- closepartners: boolean, specifies whether we should close
+		  all proxy connections or not (optional). http seems to *not*
+		  want this, but telnet does...
+		"""
+		Server.__init__(self, port, handler_class, 1, "")
+		self.proxyaddr = proxyaddr
+		self.closepartners = closepartners
+	
+	def handle_accept(self):
+		conn, addr = self.accept()
+		if VERBOSE:
+			print 'Incoming Connection from %s:%d' % addr
+		self.handler_class(conn, self.proxyaddr, closepartner=self.closepartners)
+
+
+class Connection(asyncore.dispatcher):
+	
+	"""Generic connection class"""
+	
+	def __init__(self, sock_or_address=None, readfunc=None, terminator=None):
+		"""arguments: 
+		- sock_or_address: either a socket, or a tuple containing the name 
+		and port number of a remote host
+		- readfunc: callback function (optional). Will be called whenever
+		  there is some data available, or when an appropraite terminator
+		  is found.
+		- terminator: string which specifies when a read is complete (optional)"""
+		self._out_buffer = ""
+		self._in_buffer = ""
+		self.readfunc = readfunc
+		self.terminator = terminator
+		asyncore.dispatcher.__init__(self)
+		if hasattr(sock_or_address, "fileno"):
+			self.set_socket(sock_or_address)
+		else:
+			sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+			sock.setblocking(0)
+			self.set_socket(sock)
+			if sock_or_address:
+				self.connect(sock_or_address)
+	
+	# public methods
+	def send(self, data):
+		self._out_buffer = self._out_buffer + data
+	
+	def recv(self, bytes=-1):
+		if bytes == -1:
+			bytes = len(self._in_buffer)
+		data = self._in_buffer[:bytes]
+		self._in_buffer = self._in_buffer[bytes:]
+		return data
+	
+	def set_terminator(self, terminator):
+		self.terminator = terminator
+	
+	# override this if you want to control the incoming data stream 
+	def handle_incoming_data(self, data):
+		if self.readfunc:
+			if self.terminator:
+				self._in_buffer = self._in_buffer + data
+				pos = string.find(self._in_buffer, self.terminator)
+				if pos < 0:
+					return
+				data = self._in_buffer[:pos]
+				self._in_buffer = self._in_buffer[pos + len(self.terminator):]
+				self.readfunc(data)
+			else:
+				self.readfunc(self._in_buffer + data)
+				self._in_buffer = ""
+		else:
+			self._in_buffer = self._in_buffer + data
+	
+	# internal muck
+	def handle_read(self):
+		data = asyncore.dispatcher.recv(self, BUFSIZE)
+		if data:
+			if VERBOSE > 2:
+				print "incoming ->", "%x" % id(self), `data`
+			self.handle_incoming_data(data)
+	
+	def handle_write(self):
+		if self._out_buffer:
+			sent = self.socket.send(self._out_buffer[:BUFSIZE])
+			if VERBOSE > 2:
+				print "outgoing ->", "%x" % id(self), `self._out_buffer[:sent]`
+			self._out_buffer = self._out_buffer[sent:]
+	
+	def close(self):
+		if self.readfunc and self._in_buffer:
+			self.readfunc(self._in_buffer)
+			self._in_buffer = ""
+		#elif VERBOSE > 1 and self._in_buffer:
+		#	print "--- there is unread data:", `self._in_buffer`
+		asyncore.dispatcher.close(self)
+	
+	def handle_close(self):
+		self.close()
+	
+	def handle_connect(self):
+		pass
+
+
+class ConnectionUI:
+	
+	"""Glue to let a connection tell things to the UI in a standardized way.
+	
+	The protocoll defines four functions, which the connection will call:
+	
+		def settotal(int total): gets called when the connection knows the data size
+		def setcurrent(int current): gets called when some new data has arrived
+		def done(): gets called when the transaction is complete
+		def error(type, value, tb): gets called wheneven an error occured
+	"""
+	
+	def __init__(self, settotal_func, setcurrent_func, done_func, error_func):
+		self.settotal = settotal_func
+		self.setcurrent = setcurrent_func
+		self.done = done_func
+		self.error = error_func
+
+
+class HTTPError(socket.error): pass
+
+
+class HTTPClient(Connection, httplib.HTTP):
+	
+	"""Asynchronous HTTP connection"""
+	
+	def __init__(self, (host, port), datahandler, ui=None):
+		Connection.__init__(self, (host, port))
+		self.datahandler = datahandler
+		self.ui = ui
+		self.buf = ""
+		self.doneheaders = 0
+		self.done = 0
+		self.headers = None
+		self.length = None
+		self.pos = 0
+	
+	def getreply(self):
+		raise TypeError, "getreply() is not supported in async HTTP connection"
+	
+	def handle_incoming_data(self, data):
+		assert not self.done
+		if not self.doneheaders:
+			self.buf = self.buf + data
+			pos = string.find(self.buf, "\r\n\r\n")
+			if pos >= 0:
+				self.handle_reply(self.buf[:pos+4])
+				length = self.headers.getheader("Content-Length")
+				if length is not None:
+					self.length = int(length)
+					if self.ui is not None:
+						self.ui.settotal(self.length)
+				else:
+					self.length = -1
+				self.doneheaders = 1
+				self.handle_data(self.buf[pos+4:])
+				self.buf = ""
+		else:
+			self.handle_data(data)
+	
+	def handle_reply(self, data):
+		f = cStringIO.StringIO(data)
+		ver, code, msg = string.split(f.readline(), None, 2)
+		code = int(code)
+		msg = string.strip(msg)
+		if code <> 200:
+			# Hm, this is what *I* need, but probably not correct...
+			raise HTTPError, (code, msg)
+		self.headers = mimetools.Message(f)
+	
+	def handle_data(self, data):
+		self.pos = self.pos + len(data)
+		if self.ui is not None:
+			self.ui.setcurrent(self.pos)
+		self.datahandler(data)
+		if self.pos >= self.length:
+			self.datahandler("")
+			self.done = 1
+			if self.ui is not None:
+				self.ui.done()
+	
+	def handle_error(self, type, value, tb):
+		if self.ui is not None:
+			self.ui.error(type, value, tb)
+		else:
+			Connection.handle_error(self, type, value, tb)
+	
+	def log(self, message):
+		if VERBOSE:
+			print 'LOG:', message
+
+
+class PyMessage:
+	
+	def __init__(self):
+		self._buf = ""
+		self._len = None
+		self._checksum = None
+	
+	def feed(self, data):
+		self._buf = self._buf + data
+		if self._len is None:
+			if len(self._buf) >= 8:
+				import struct
+				self._len, self._checksum = struct.unpack("ll", self._buf[:8])
+				self._buf = self._buf[8:]
+		if self._len is not None:
+			if len(self._buf) >= self._len:
+				import zlib
+				data = self._buf[:self._len]
+				leftover = self._buf[self._len:]
+				self._buf = None
+				assert self._checksum == zlib.adler32(data), "corrupt data"
+				self.data = data
+				return 1, leftover
+			else:
+				return 0, None
+		else:
+			return 0, None
+
+
+class PyConnection(Connection):
+	
+	def __init__(self, sock_or_address):
+		Connection.__init__(self, sock_or_address)
+		self.currentmessage = PyMessage()
+	
+	def handle_incoming_data(self, data):
+		while data:
+			done, data = self.currentmessage.feed(data)
+			if done:
+				import cPickle
+				self.handle_object(cPickle.loads(self.currentmessage.data))
+				self.currentmessage = PyMessage()
+	
+	def handle_object(self, object):
+		print 'unhandled object:', `object`
+	
+	def send(self, object):
+		import cPickle, zlib, struct
+		data = cPickle.dumps(object, 1)
+		length = len(data)
+		checksum = zlib.adler32(data)
+		data = struct.pack("ll", length, checksum) + data
+		Connection.send(self, data)
+
+
+class Echo(Connection):
+	
+	"""Simple echoing connection: it sends everything back it receives.""" 
+	
+	def handle_incoming_data(self, data):
+		self.send(data)
+
+
+class Proxy(Connection):
+	
+	"""Generic proxy connection"""
+	
+	def __init__(self, sock_or_address=None, proxyaddr=None, closepartner=0):
+		"""arguments:
+		- sock_or_address is either a socket or a tuple containing the 
+		name and port number of a remote host
+		- proxyaddr: a tuple containing a name and a port number of a 
+		  remote host (optional).
+		- closepartner: boolean, specifies whether we should close
+		  the proxy connection (optional)"""
+		
+		Connection.__init__(self, sock_or_address)
+		self.other = None
+		self.proxyaddr = proxyaddr
+		self.closepartner = closepartner
+	
+	def close(self):
+		if self.other:
+			other = self.other
+			self.other = None
+			other.other = None
+			if self.closepartner:
+				other.close()
+		Connection.close(self)
+	
+	def handle_incoming_data(self, data):
+		if not self.other:
+			# pass data for possible automatic remote host detection
+			# (see HTTPProxy)
+			data = self.connectproxy(data)
+		self.other.send(data)
+	
+	def connectproxy(self, data):
+		other = self.__class__(self.proxyaddr, closepartner=self.closepartner)
+		self.other = other
+		other.other = self
+		return data
+
+
+class HTTPProxy(Proxy):
+	
+	"""Simple, useless, http proxy. It figures out itself where to connect to."""
+	
+	def connectproxy(self, data):
+		if VERBOSE:
+			print "--- proxy request", `data`
+		addr, data = de_proxify(data)
+		other = Proxy(addr)
+		self.other = other
+		other.other = self
+		return data
+
+
+# helper for HTTPProxy
+def de_proxify(data):
+	import re
+	req_pattern = "GET http://([a-zA-Z0-9-_.]+)(:([0-9]+))?"
+	m = re.match(req_pattern, data)
+	host, dummy, port = m.groups()
+	if not port:
+		port = 80
+	else:
+		port = int(port)
+	# change "GET http://xx.xx.xx/yy" into "GET /yy"
+	data = re.sub(req_pattern, "GET ", data)
+	return (host, port), data
+
+
+# if we're running "under W", let's register the socket poller to the event loop
+try:
+	import W
+except:
+	pass
+else:
+	W.getapplication().addidlefunc(asyncore.poll)
+
+
+## testing muck
+#testserver = Server(10000, Connection)
+#echoserver = Server(10007, Echo)
+#httpproxyserver = Server(8088, HTTPProxy, 5)
+#asyncore.close_all()