Sam's latest versions

Lib/asynchat.py

@@ -63,10 +63,7 @@ class async_chat (asyncore.dispatcher):
 		asyncore.dispatcher.__init__ (self, conn)
 
 	def set_terminator (self, term):
-		"Set the input delimiter.  Can be a fixed string of any length, or None"
-		if term is None:
-			self.terminator = ''
-		else:
+		"Set the input delimiter.  Can be a fixed string of any length, an integer, or None"
 		self.terminator = term
 
 	def get_terminator (self):
@@ -82,8 +79,7 @@ class async_chat (asyncore.dispatcher):
 		try:
 			data = self.recv (self.ac_in_buffer_size)
 		except socket.error, why:
-			import sys
-			self.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback)
+			self.handle_error()
 			return
 
 		self.ac_in_buffer = self.ac_in_buffer + data
@@ -94,17 +90,33 @@ class async_chat (asyncore.dispatcher):
 		# combos with a single recv(1024).
 
 		while self.ac_in_buffer:
+			lb = len(self.ac_in_buffer)
 			terminator = self.get_terminator()
-			terminator_len = len(terminator)
-			# 4 cases:
+			if terminator is None:
+				# no terminator, collect it all
+				self.collect_incoming_data (self.ac_in_buffer)
+				self.ac_in_buffer = ''
+			elif type(terminator) == type(0):
+				# numeric terminator
+				n = terminator
+				if lb < n:
+					self.collect_incoming_data (self.ac_in_buffer)
+					self.ac_in_buffer = ''
+					self.terminator = self.terminator - lb
+				else:
+					self.collect_incoming_data (self.ac_in_buffer[:n])
+					self.ac_in_buffer = self.ac_in_buffer[n:]
+					self.terminator = 0
+					self.found_terminator()
+			else:
+				# 3 cases:
 				# 1) end of buffer matches terminator exactly:
 				#    collect data, transition
 				# 2) end of buffer matches some prefix:
 				#    collect data to the prefix
 				# 3) end of buffer does not match any prefix:
 				#    collect data
-			# 4) no terminator, just collect the data
-			if terminator:
+				terminator_len = len(terminator)
 				index = string.find (self.ac_in_buffer, terminator)
 				if index != -1:
 					# we found the terminator
@@ -116,6 +128,7 @@ class async_chat (asyncore.dispatcher):
 					# check for a prefix of the terminator
 					index = find_prefix_at_end (self.ac_in_buffer, terminator)
 					if index:
+						if index != lb:
 							# we found a prefix, collect up to the prefix
 							self.collect_incoming_data (self.ac_in_buffer[:-index])
 							self.ac_in_buffer = self.ac_in_buffer[-index:]
@@ -124,10 +137,6 @@ class async_chat (asyncore.dispatcher):
 						# no prefix, collect it all
 						self.collect_incoming_data (self.ac_in_buffer)
 						self.ac_in_buffer = ''
-			else:
-				# no terminator, collect it all
-				self.collect_incoming_data (self.ac_in_buffer)
-				self.ac_in_buffer = ''
 
 	def handle_write (self):
 		self.initiate_send ()
@@ -144,17 +153,27 @@ class async_chat (asyncore.dispatcher):
 		self.initiate_send()
 
 	def readable (self):
+		"predicate for inclusion in the readable for select()"
 		return (len(self.ac_in_buffer) <= self.ac_in_buffer_size)
 
 	def writable (self):
-		return len(self.ac_out_buffer) or len(self.producer_fifo) or (not self.connected)
+		"predicate for inclusion in the writable for select()"
+		# return len(self.ac_out_buffer) or len(self.producer_fifo) or (not self.connected)
+		# this is about twice as fast, though not as clear.
+		return not (
+			(self.ac_out_buffer is '') and
+			self.producer_fifo.is_empty() and
+			self.connected
+			)
 
 	def close_when_done (self):
+		"automatically close this channel once the outgoing queue is empty"
 		self.producer_fifo.push (None)
 
 	# refill the outgoing buffer by calling the more() method
 	# of the first producer in the queue
 	def refill_buffer (self):
+		_string_type = type('')
 		while 1:
 			if len(self.producer_fifo):
 				p = self.producer_fifo.first()
@@ -165,6 +184,10 @@ class async_chat (asyncore.dispatcher):
 						self.producer_fifo.pop()
 						self.close()
 					return
+				elif type(p) is _string_type:
+					self.producer_fifo.pop()
+					self.ac_out_buffer = self.ac_out_buffer + p
+					return
 				data = p.more()
 				if data:
 					self.ac_out_buffer = self.ac_out_buffer + data
@@ -177,15 +200,20 @@ class async_chat (asyncore.dispatcher):
 	def initiate_send (self):
 		obs = self.ac_out_buffer_size
 		# try to refill the buffer
-		if (not self._push_mode) and (len (self.ac_out_buffer) < obs):
+		if (len (self.ac_out_buffer) < obs):
 			self.refill_buffer()
 
 		if self.ac_out_buffer and self.connected:
 			# try to send the buffer
+			try:
 				num_sent = self.send (self.ac_out_buffer[:obs])
 				if num_sent:
 					self.ac_out_buffer = self.ac_out_buffer[num_sent:]
 
+			except socket.error, why:
+				self.handle_error()
+				return
+
 	def discard_buffers (self):
 		# Emergencies only!
 		self.ac_in_buffer = ''
@@ -193,17 +221,8 @@ class async_chat (asyncore.dispatcher):
 		while self.producer_fifo:
 			self.producer_fifo.pop()
 
-	# ==================================================
-	# support for push mode.
-	# ==================================================
-	_push_mode = 0
-	def push_mode (self, boolean):
-		self._push_mode = boolean
-
-	def writable_push (self):
-		return self.connected and len(self.ac_out_buffer)
-
 class simple_producer:
+
 	def __init__ (self, data, buffer_size=512):
 		self.data = data
 		self.buffer_size = buffer_size
@@ -228,6 +247,9 @@ class fifo:
 	def __len__ (self):
 		return len(self.list)
 
+	def is_empty (self):
+		return self.list == []
+
 	def first (self):
 		return self.list[0]
 

Lib/asyncore.py

@@ -37,38 +37,33 @@ if os.name == 'nt':
 	EALREADY	= 10037
 	ECONNRESET  = 10054
 	ENOTCONN	= 10057
+	ESHUTDOWN	= 10058
 else:
-	from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, ENOTCONN
+	from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, ENOTCONN, ESHUTDOWN
 
 socket_map = {}
 
-def poll (timeout=0.0, ignore_expt=1):
+def poll (timeout=0.0):
 	if socket_map:
-		sockets = socket_map.keys()
-		r = filter (lambda x: x.readable(), sockets)
-		w = filter (lambda x: x.writable(), sockets)
-		if ignore_expt:
-			e = []
-		else:
-			e = sockets[:]
+		r = []; w = []; e = []
+		for s in socket_map.keys():
+			if s.readable():
+				r.append (s)
+			if s.writable():
+				w.append (s)
 
 		(r,w,e) = select.select (r,w,e, timeout)
 
-		for x in e:
-			try:
-				x.handle_expt_event()
-			except:
-				x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback)
 		for x in r:
 			try:
 				x.handle_read_event()
 			except:
-				x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback)
+				x.handle_error()
 		for x in w:
 			try:
 				x.handle_write_event()
 			except:
-				x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback)
+				x.handle_error()
 
 def poll2 (timeout=0.0):
 	import poll
@@ -88,7 +83,6 @@ def poll2 (timeout=0.0):
 			if flags:
 				l.append (fd, flags)
 		r = poll.poll (l, timeout)
-		print r
 		for fd, flags in r:
 			s = fd_map[fd]
 			try:
@@ -99,7 +93,7 @@ def poll2 (timeout=0.0):
 				if (flags & poll.POLLERR):
 					s.handle_expt_event()
 			except:
-				apply (s.handle_error, sys.exc_info())
+				s.handle_error()
 
 
 def loop (timeout=30.0, use_poll=0):
@@ -149,11 +143,13 @@ class dispatcher:
 			return '<__repr__ (self) failed for object at %x (addr=%s)>' % (id(self),ar)
 
 	def add_channel (self):
+		if __debug__:
 			self.log ('adding channel %s' % self)
 		socket_map [self] = 1
 
 	def del_channel (self):
 		if socket_map.has_key (self):
+			if __debug__:
 				self.log ('closing channel %d:%s' % (self.fileno(), self))
 			del socket_map [self]
 
@@ -164,7 +160,8 @@ class dispatcher:
 		self.add_channel()
 
 	def set_socket (self, socket):
-		self.socket = socket
+		# This is done so we can be called safely from __init__
+		self.__dict__['socket'] = socket
 		self.add_channel()
 
 	def set_reuse_addr (self):
@@ -210,6 +207,7 @@ class dispatcher:
 		return self.socket.bind (addr)
 
 	def connect (self, address):
+		self.connected = 0
 		try:
 			self.socket.connect (address)
 		except socket.error, why:
@@ -253,7 +251,7 @@ class dispatcher:
 				return data
 		except socket.error, why:
 			# winsock sometimes throws ENOTCONN
-			if why[0] in [ECONNRESET, ENOTCONN]:
+			if why[0] in [ECONNRESET, ENOTCONN, ESHUTDOWN]:
 				self.handle_close()
 				return ''
 			else:
@@ -262,15 +260,12 @@ class dispatcher:
 	def close (self):
 		self.del_channel()
 		self.socket.close()
-		self.connected = 0
 
 	# cheap inheritance, used to pass all other attribute
 	# references to the underlying socket object.
+	# NOTE: this may be removed soon for performance reasons.
 	def __getattr__ (self, attr):
-		if attr != 'socket':
 		return getattr (self.socket, attr)
-		else:
-			raise AttributeError, attr
 
 	def log (self, message):
 		print 'log:', message
@@ -299,9 +294,8 @@ class dispatcher:
 	def handle_expt_event (self):
 		self.handle_expt()
 
-	def handle_error (self, *info):
-		(t,v,tb) = info
-		(file,fun,line), tbinfo = compact_traceback (t,v,tb)
+	def handle_error (self):
+		(file,fun,line), t, v, tbinfo = compact_traceback()
 
 		# sometimes a user repr method will crash.
 		try:
@@ -312,33 +306,35 @@ class dispatcher:
 		print (
 			'uncaptured python exception, closing channel %s (%s:%s %s)' % (
 				self_repr,
-				str(t),
-				str(v),
+				t,
+				v,
 				tbinfo
 				)
 			)
-		del t,v,tb
 		self.close()
 
 	def handle_expt (self):
+		if __debug__:
 			self.log ('unhandled exception')
 
 	def handle_read (self):
+		if __debug__:
 			self.log ('unhandled read event')
 
 	def handle_write (self):
+		if __debug__:
 			self.log ('unhandled write event')
 
 	def handle_connect (self):
+		if __debug__:
 			self.log ('unhandled connect event')
 
-	def handle_oob (self):
-		self.log ('unhandled out-of-band event')
-
 	def handle_accept (self):
+		if __debug__:
 			self.log ('unhandled accept event')
 
 	def handle_close (self):
+		if __debug__:
 			self.log ('unhandled close event')
 		self.close()
 
@@ -373,7 +369,8 @@ class dispatcher_with_send (dispatcher):
 # used for debugging.
 # ---------------------------------------------------------------------------
 
-def compact_traceback (t,v,tb):
+def compact_traceback ():
+	t,v,tb = sys.exc_info()
 	tbinfo = []
 	while 1:
 		tbinfo.append (
@@ -385,6 +382,9 @@ def compact_traceback (t,v,tb):
 		if not tb:
 			break
 
+	# just to be safe
+	del tb
+
 	file, function, line = tbinfo[-1]
 	info = '[' + string.join (
 		map (
@@ -393,7 +393,7 @@ def compact_traceback (t,v,tb):
 			),
 		'] ['
 		) + ']'
-	return (file, function, line), info
+	return (file, function, line), t, v, info
 
 def close_all ():
 	global socket_map
@@ -450,4 +450,4 @@ if os.name == 'posix':
 		def set_file (self, fd):
 			self.socket = file_wrapper (fd)
 			self.add_channel()
-#not really
+