How to use the rs4.asyncore function in rs4

with self.lock:
			v = dict.items (self)		
		return v
			
	def keys (self):
		with self.lock:
			v = dict.keys (self)
		return v
	
	def values (self):
		with self.lock:
			v = dict.values (self)		
		return v


if not hasattr (asyncore, "_socket_map"):
	asyncore._socket_map = asyncore.socket_map
	del asyncore.socket_map
	asyncore.socket_map = thread_safe_socket_map ()

def handshake (self):		
		if not self._handshaking:
			err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
			if err != 0:
				raise OSError(err, asyncore._strerror(err))
				
			ssl_context = create_urllib3_context(ssl_version=resolve_ssl_version(None), cert_reqs=resolve_cert_reqs(None))
			if self.ac_negotiate_http2:								
				try: ssl_context.set_alpn_protocols (H2_PROTOCOLS)
				except AttributeError: ssl_context.set_npn_protocols (H2_PROTOCOLS)								
			self.socket = ssl_context.wrap_socket (self.socket, do_handshake_on_connect = False, server_hostname = self.address [0])			
			self._handshaking = True
			
		try:
			self.socket.do_handshake ()
		except ssl.SSLError as why:
			if why.args [0] in (ssl.SSL_ERROR_WANT_READ, ssl.SSL_ERROR_WANT_WRITE):
				return False
			raise ssl.SSLError(why)
			
		try: self._proto = self.socket.selected_alpn_protocol()