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asyncws.py
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asyncws.py
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# -*- coding: utf-8 -*-
import os
import sys
import base64
import hashlib
import socket
import asynchat
import asyncore
import mimetools
from StringIO import StringIO
from utils import format_header, parse_frame_head, apply_mask,\
consider_extended_frame_head, create_message
_ws_key = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
CONTROL_FRAME_TYPES = {
0x8: 'close',
0x9: 'ping',
0xA: 'pong',
}
class FrameReaderWriter(asynchat.async_chat):
collect_incoming_data = asynchat.async_chat._collect_incoming_data
require_masking = False
mask_outgoing = False
def __init__(self):
asynchat.async_chat.__init__(self)
self.set_terminator('\r\n\r\n')
self.process_data = self._handle_handshake
self.frames = []
self._closing_frame_sent = False
def handle_error(self):
raise
def found_terminator(self):
self.process_data()
def _on_message(self, message, binary=False):
self.log_info('on_message: {0}'.format(message))
def on_connect(self):
self.log_info('on_connect')
def on_close(self, close):
self.log_info('on_close')
def send_message(self, message, opcode=0x1):
self.log_info('send_message({1}): {0}'.format(message, repr(self)))
mask = ''
if self.mask_outgoing:
mask = os.urandom(4)
self.push(create_message(message, mask=mask, opcode=opcode))
def send_close_message(self, payload=''):
self._closing_frame_sent = True
self.send_message(payload, opcode=0x8)
def handle_handshake(self):
raise NotImplementedError()
def _handle_handshake(self):
self.handle_handshake()
self.process_data = self._parse_frame_head
# minimal posible frame length
self.set_terminator(2)
self.on_connect()
def _parse_frame_head(self):
data = self._get_data()
frame = parse_frame_head(data)
self.frames.append(frame)
more, plen = frame['more'], frame['payload_len']
if self.require_masking:
assert frame['mask']
if more:
self.process_data = self._parse_extended_frame_head
self.set_terminator(more)
elif plen:
self.process_data = self._parse_frame_payload
self.set_terminator(plen)
else:
# unmasked frame (no payload)
self._handle_frame()
def _parse_extended_frame_head(self):
frame = self.frames[-1]
consider_extended_frame_head(frame, self._get_data())
plen = frame['payload_len']
if plen:
self.process_data = self._parse_frame_payload
self.set_terminator(plen)
else:
# masked frame (no payload)
self._handle_frame()
def _parse_frame_payload(self):
frame = self.frames[-1]
payload = self._get_data()
if frame['mask'] and payload:
payload = apply_mask(payload, frame['mask'])
frame['payload'] = payload
self._handle_frame()
def _handle_frame(self):
control_frame = CONTROL_FRAME_TYPES.get(self.frames[-1]['opcode'], None)
# control frames
if control_frame:
assert self.frames[-1]['fin']
# every such handler removes last frame
getattr(self, '_ctl_frame_%s' % control_frame)()
if self.frames:
if self.frames[-1]['fin']:
self._handle_fin_frame()
else:
assert self.frames[-1]['opcode']==0x0
self.process_data = self._parse_frame_head
self.set_terminator(2)
def _handle_fin_frame(self):
payload_type = self.frames[0]['opcode']
assert payload_type in (0x1, 0x2)
message = ''.join([f['payload'] for f in self.frames])
if payload_type == 0x1:
message = message.decode('utf-8')
self.frames = []
self._on_message(message, binary=payload_type==0x2)
def _ctl_frame_close(self):
frame = self.frames.pop()
payload = frame['payload']
if frame['mask'] and payload:
payload = apply_mask(payload, frame['mask'])
self.log_info('Connection is closing: %s' % payload)
if self._closing_frame_sent:
self.close()
else:
self.send_message(payload, opcode=0x8)
self.close_when_done()
self.on_close(payload)
sys.exit(0)
def _ctl_frame_ping(self):
frame = self.frames.pop()
self.send_message(frame['payload'], opcode=0xA)
def _ctl_frame_pong(self):
self.frames.pop()
# there is no response for pong frame
class Client(FrameReaderWriter):
mask_outgoing = True
def __init__(self, host, port, path='/'):
self.host = host
self.port = port
self.path = path
self._key = base64.b64encode(os.urandom(16))
self._response_key = base64.b64encode(
hashlib.sha1(self._key+_ws_key).digest())
FrameReaderWriter.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect((host, port))
def handle_connect(self):
self.push('GET {0} HTTP/1.1\r\n'.format(self.path))
self.push(format_header('Host', self.host))
self.push(format_header('Connection', 'Upgrade'))
self.push(format_header('Upgrade', 'websocket'))
self.push(format_header('Sec-Websocket-Key', self._key))
self.push(format_header('Sec-Websocket-Protocol', 'chat'))
self.push(format_header('Sec-Websocket-Version', '13'))
self.push('\r\n')
def handle_handshake(self):
response_status_line, headers = self._get_data().split('\r\n', 1)
assert response_status_line.lower().startswith('http/1.1 101 ')
# omg
headers = mimetools.Message(StringIO(headers))
assert headers.get('connection', '').lower() == 'upgrade'
assert headers.get('upgrade', '').lower() == 'websocket'
assert headers.get('sec-websocket-accept', '') == self._response_key
def _on_message(self, message, binary):
self.on_message(message, binary)
class ClientHandler(FrameReaderWriter):
require_masking = True
def __init__(self, sock, on_message):
FrameReaderWriter.__init__(self)
self.set_socket(sock)
self._response_key = ''
self.on_message = on_message
def handle_handshake(self):
request, headers = self._get_data().split('\r\n', 1)
assert request.lower()== 'get / http/1.1'
headers = mimetools.Message(StringIO(headers))
assert headers.get('connection', '').lower() == 'upgrade'
assert headers.get('upgrade', '').lower() == 'websocket'
assert headers.get('sec-websocket-version', '') == '13'
key = headers.get('sec-websocket-key', '')
assert key
self._response_key = rkey = base64.b64encode(
hashlib.sha1(key+_ws_key).digest())
self.push('HTTP/1.1 101 Switching Protocols\r\n')
self.push(format_header('Connection', 'Upgrade'))
self.push(format_header('Upgrade', 'websocket'))
self.push(format_header('Sec-Websocket-Accept', rkey))
self.push(format_header('Sec-Websocket-Protocol', 'chat'))
self.push('\r\n')
def _on_message(self, message, binary):
self.on_message(self, message, binary)
class Server(asyncore.dispatcher):
def __init__(self, host, port, path='/'):
self.host = host
self.port = port
self.path = path
asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.bind((host, port))
self.listen(5)
def handle_accept(self):
client_info = self.accept()
ClientHandler(client_info[0], self.on_message)
if __name__ == '__main__':
try:
class EchoClient(Client):
def on_connect(self):
self.send_message('Hello')
#self.send_close_message()
def on_message(self, message, binary=False):
self.log_info('client got: {0}'.format(message))
self.send_message(message+' !')
class EchoServer(Server):
def on_message(self, client, message, binary=False):
self.log_info('server got: {0}'.format(message))
client.send_message(message)
host, port = 'localhost', 2828
server = EchoServer(host, port)
client = EchoClient(host, port)
asyncore.loop()
except KeyboardInterrupt:
client.send_close_message()
asyncore.loop()