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175 lines (158 loc) · 6.33 KB
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import time
import six
from . import packet
from . import payload
class Socket(object):
"""An Engine.IO socket."""
upgrade_protocols = ['websocket']
def __init__(self, server, sid):
self.server = server
self.sid = sid
self.queue = getattr(self.server.async['queue'],
self.server.async['queue_class'])()
self.last_ping = time.time()
self.connected = False
self.upgraded = False
self.closed = False
def poll(self):
"""Wait for packets to send to the client."""
try:
packets = [self.queue.get(timeout=self.server.ping_timeout)]
self.queue.task_done()
except self.server.async['queue'].Empty:
raise IOError()
try:
packets.append(self.queue.get(block=False))
self.queue.task_done()
except self.server.async['queue'].Empty:
pass
return packets
def receive(self, pkt):
"""Receive packet from the client."""
self.server.logger.info('%s: Received packet %s with %s', self.sid,
packet.packet_names[pkt.packet_type],
pkt.data)
if pkt.packet_type == packet.PING:
self.last_ping = time.time()
self.send(packet.Packet(packet.PONG, pkt.data))
elif pkt.packet_type == packet.MESSAGE:
self.server._trigger_event('message', self.sid, pkt.data)
elif pkt.packet_type == packet.UPGRADE:
self.send(packet.Packet(packet.NOOP))
else:
raise ValueError
def send(self, pkt):
"""Send a packet to the client."""
if self.closed:
raise IOError('Socket is closed')
if time.time() - self.last_ping > self.server.ping_interval * 5 / 4:
self.server.logger.info('%s: Client is gone, closing socket',
self.sid)
self.close(wait=False, abort=True)
return
self.queue.put(pkt)
self.server.logger.info('%s: Sending packet %s with %s', self.sid,
packet.packet_names[pkt.packet_type],
pkt.data)
def handle_get_request(self, environ, start_response):
"""Handle a long-polling GET request from the client."""
connections = [
s.strip()
for s in environ.get('HTTP_CONNECTION', '').lower().split(',')]
transport = environ.get('HTTP_UPGRADE', '').lower()
if 'upgrade' in connections and transport in self.upgrade_protocols:
self.server.logger.info('%s: Received request to upgrade to %s',
self.sid, transport)
return getattr(self, '_upgrade_' + transport)(environ,
start_response)
self.connected = True
try:
packets = self.poll()
except IOError as e:
self.close(wait=False)
raise e
return packets
def handle_post_request(self, environ):
"""Handle a long-polling POST request from the client."""
length = int(environ.get('CONTENT_LENGTH', '0'))
if length > self.server.max_http_buffer_size:
raise ValueError()
else:
body = environ['wsgi.input'].read(length)
p = payload.Payload(encoded_payload=body)
for pkt in p.packets:
self.receive(pkt)
def close(self, wait=True, abort=False):
"""Close the socket connection."""
self.server._trigger_event('disconnect', self.sid)
if not abort:
self.send(packet.Packet(packet.CLOSE))
self.closed = True
if wait:
self.queue.join()
def _upgrade_websocket(self, environ, start_response):
"""Upgrade the connection from polling to websocket."""
if self.upgraded:
raise IOError('Socket has been upgraded already')
websocket_class = getattr(self.server.async['websocket'],
self.server.async['websocket_class'])
ws = websocket_class(self._websocket_handler)
return ws(environ, start_response)
def _websocket_handler(self, ws):
"""Engine.IO handler for websocket transport."""
if self.connected:
# the socket was already connected, so this is an upgrade
pkt = ws.wait()
if pkt != packet.Packet(packet.PING,
data=six.text_type('probe')).encode(
always_bytes=False):
self.server.logger.info(
'%s: Failed websocket upgrade, no PING packet', self.sid)
return
ws.send(packet.Packet(
packet.PONG,
data=six.text_type('probe')).encode(always_bytes=False))
self.send(packet.Packet(packet.NOOP))
self.upgraded = True
self.queue.join()
pkt = ws.wait()
if pkt != packet.Packet(packet.UPGRADE).encode(always_bytes=False):
self.upgraded = False
self.server.logger.info(
'%s: Failed websocket upgrade, no UPGRADE packet',
self.sid)
return
else:
self.connected = True
self.upgraded = True
def writer():
while True:
try:
packets = self.poll()
except IOError:
break
try:
for pkt in packets:
ws.send(pkt.encode(always_bytes=False))
except:
break
writer_task = self.server._start_background_task(writer)
writer_task.start()
self.server.logger.info(
'%s: Upgrade to websocket successful', self.sid)
while True:
try:
p = ws.wait()
except:
break
if p is None:
break
if isinstance(p, six.text_type): # pragma: no cover
p = p.encode('utf-8')
pkt = packet.Packet(encoded_packet=p)
try:
self.receive(pkt)
except ValueError:
pass
self.close(wait=False, abort=True)
writer_task.join()