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#!/usr/bin/env python3
"""Multiprocess WebSocket http chat example."""
import argparse
import os
import socket
import signal
import time
import asyncio
import aiohttp
import aiohttp.server
from aiohttp import websocket
ARGS = argparse.ArgumentParser(description="Run simple http server.")
ARGS.add_argument(
'--host', action="store", dest='host',
default='127.0.0.1', help='Host name')
ARGS.add_argument(
'--port', action="store", dest='port',
default=8080, type=int, help='Port number')
ARGS.add_argument(
'--workers', action="store", dest='workers',
default=2, type=int, help='Number of workers.')
WS_FILE = os.path.join(os.path.dirname(__file__), 'websocket.html')
class HttpRequestHandler(aiohttp.server.ServerHttpProtocol):
clients = None # list of all active connections
parent = None # supervisor, we use it as broadcaster to all workers
def __init__(self, *args, parent=None, clients=None, **kwargs):
super().__init__(*args, **kwargs)
self.parent = parent
self.clients = clients
@asyncio.coroutine
def handle_request(self, message, payload):
upgrade = 'websocket' in message.headers.get('UPGRADE', '').lower()
if upgrade:
# websocket handshake
status, headers, parser, writer, protocol = websocket.do_handshake(
message.method, message.headers, self.transport)
resp = aiohttp.Response(
self.writer, status, http_version=message.version)
resp.add_headers(*headers)
resp.send_headers()
# install websocket parser
dataqueue = self.reader.set_parser(parser)
# notify everybody
print('{}: Someone joined.'.format(os.getpid()))
for wsc in self.clients:
wsc.send(b'Someone joined.')
self.clients.append(writer)
self.parent.send(b'Someone joined.')
# chat dispatcher
while True:
try:
msg = yield from dataqueue.read()
except:
# client dropped connection
break
if msg.tp == websocket.MSG_PING:
writer.pong()
elif msg.tp == websocket.MSG_TEXT:
data = msg.data.strip()
print('{}: {}'.format(os.getpid(), data))
for wsc in self.clients:
if wsc is not writer:
wsc.send(data.encode())
self.parent.send(data)
elif msg.tp == websocket.MSG_CLOSE:
break
# notify everybody
print('{}: Someone disconnected.'.format(os.getpid()))
self.parent.send(b'Someone disconnected.')
self.clients.remove(writer)
for wsc in self.clients:
wsc.send(b'Someone disconnected.')
else:
# send html page with js chat
response = aiohttp.Response(
self.writer, 200, http_version=message.version)
response.add_header('Transfer-Encoding', 'chunked')
response.add_header('Content-type', 'text/html')
response.send_headers()
try:
with open(WS_FILE, 'rb') as fp:
chunk = fp.read(8192)
while chunk:
if not response.write(chunk):
break
chunk = fp.read(8192)
except OSError:
response.write(b'Cannot open')
yield from response.write_eof()
if response.keep_alive():
self.keep_alive(True)
class ChildProcess:
def __init__(self, up_read, down_write, args, sock):
self.up_read = up_read
self.down_write = down_write
self.args = args
self.sock = sock
self.clients = []
def start(self):
# start server
self.loop = loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
def stop():
self.loop.stop()
os._exit(0)
loop.add_signal_handler(signal.SIGINT, stop)
# heartbeat
asyncio.Task(self.heartbeat())
asyncio.get_event_loop().run_forever()
os._exit(0)
@asyncio.coroutine
def start_server(self, writer):
socks = yield from self.loop.create_server(
lambda: HttpRequestHandler(
debug=True, keep_alive=75,
parent=writer, clients=self.clients),
sock=self.sock)
print('Starting srv worker process {} on {}'.format(
os.getpid(), socks.sockets[0].getsockname()))
@asyncio.coroutine
def heartbeat(self):
# setup pipes
read_transport, read_proto = yield from self.loop.connect_read_pipe(
aiohttp.StreamProtocol, os.fdopen(self.up_read, 'rb'))
write_transport, _ = yield from self.loop.connect_write_pipe(
aiohttp.StreamProtocol, os.fdopen(self.down_write, 'wb'))
reader = read_proto.reader.set_parser(websocket.WebSocketParser)
writer = websocket.WebSocketWriter(write_transport)
asyncio.Task(self.start_server(writer))
while True:
try:
msg = yield from reader.read()
except:
print('Supervisor is dead, {} stopping...'.format(os.getpid()))
self.loop.stop()
break
if msg.tp == websocket.MSG_PING:
writer.pong()
elif msg.tp == websocket.MSG_CLOSE:
break
elif msg.tp == websocket.MSG_TEXT: # broadcast message
for wsc in self.clients:
wsc.send(msg.data.strip().encode())
read_transport.close()
write_transport.close()
class Worker:
_started = False
def __init__(self, sv, loop, args, sock):
self.sv = sv
self.loop = loop
self.args = args
self.sock = sock
self.start()
def start(self):
assert not self._started
self._started = True
up_read, up_write = os.pipe()
down_read, down_write = os.pipe()
args, sock = self.args, self.sock
pid = os.fork()
if pid:
# parent
os.close(up_read)
os.close(down_write)
asyncio.async(self.connect(pid, up_write, down_read))
else:
# child
os.close(up_write)
os.close(down_read)
# cleanup after fork
asyncio.set_event_loop(None)
# setup process
process = ChildProcess(up_read, down_write, args, sock)
process.start()
@asyncio.coroutine
def heartbeat(self, writer):
while True:
yield from asyncio.sleep(15)
if (time.monotonic() - self.ping) < 30:
writer.ping()
else:
print('Restart unresponsive worker process: {}'.format(
self.pid))
self.kill()
self.start()
return
@asyncio.coroutine
def chat(self, reader):
while True:
try:
msg = yield from reader.read()
except:
print('Restart unresponsive worker process: {}'.format(
self.pid))
self.kill()
self.start()
return
if msg.tp == websocket.MSG_PONG:
self.ping = time.monotonic()
elif msg.tp == websocket.MSG_TEXT: # broadcast to all workers
for worker in self.sv.workers:
if self.pid != worker.pid:
worker.writer.send(msg.data)
@asyncio.coroutine
def connect(self, pid, up_write, down_read):
# setup pipes
read_transport, proto = yield from self.loop.connect_read_pipe(
aiohttp.StreamProtocol, os.fdopen(down_read, 'rb'))
write_transport, _ = yield from self.loop.connect_write_pipe(
aiohttp.StreamProtocol, os.fdopen(up_write, 'wb'))
# websocket protocol
reader = proto.reader.set_parser(websocket.WebSocketParser)
writer = websocket.WebSocketWriter(write_transport)
# store info
self.pid = pid
self.ping = time.monotonic()
self.writer = writer
self.rtransport = read_transport
self.wtransport = write_transport
self.chat_task = asyncio.async(self.chat(reader))
self.heartbeat_task = asyncio.async(self.heartbeat(writer))
def kill(self):
self._started = False
self.chat_task.cancel()
self.heartbeat_task.cancel()
self.rtransport.close()
self.wtransport.close()
os.kill(self.pid, signal.SIGTERM)
class Supervisor:
def __init__(self, args):
self.loop = asyncio.get_event_loop()
self.args = args
self.workers = []
def start(self):
# bind socket
sock = self.sock = socket.socket()
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((self.args.host, self.args.port))
sock.listen(1024)
sock.setblocking(False)
# start processes
for idx in range(self.args.workers):
self.workers.append(Worker(self, self.loop, self.args, sock))
self.loop.add_signal_handler(signal.SIGINT, lambda: self.loop.stop())
self.loop.run_forever()
def main():
args = ARGS.parse_args()
if ':' in args.host:
args.host, port = args.host.split(':', 1)
args.port = int(port)
supervisor = Supervisor(args)
supervisor.start()
if __name__ == '__main__':
main()
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