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import os
import gevent
import time
from gevent.pool import Pool
from gevent.server import StreamServer
from gunicorn.workers.ggevent import GeventPyWSGIWorker
from gunicorn.workers.ggevent import PyWSGIHandler
from gunicorn.workers.ggevent import GeventResponse
from gunicorn import version_info as gunicorn_version
from socketio.server import SocketIOServer
from socketio.handler import SocketIOHandler
from geventwebsocket.handler import WebSocketHandler
from datetime import datetime
from functools import partial
class GunicornWSGIHandler(PyWSGIHandler, SocketIOHandler):
pass
class GunicornWebSocketWSGIHandler(WebSocketHandler):
def log_request(self):
start = datetime.fromtimestamp(self.time_start)
finish = datetime.fromtimestamp(self.time_finish)
response_time = finish - start
resp = GeventResponse(self.status, [],
self.response_length)
req_headers = [h.split(":", 1) for h in self.headers.headers]
self.server.log.access(
resp, req_headers, self.environ, response_time)
class GeventSocketIOBaseWorker(GeventPyWSGIWorker):
""" The base gunicorn worker class """
transports = None
def __init__(self, age, ppid, socket, app, timeout, cfg, log):
if os.environ.get('POLICY_SERVER', None) is None:
if self.policy_server:
os.environ['POLICY_SERVER'] = 'true'
else:
self.policy_server = False
super(GeventSocketIOBaseWorker, self).__init__(
age, ppid, socket, app, timeout, cfg, log)
def run(self):
if gunicorn_version >= (0, 17, 0):
servers = []
ssl_args = {}
if self.cfg.is_ssl:
ssl_args = dict(
server_side=True,
do_handshake_on_connect=False,
**self.cfg.ssl_options
)
for s in self.sockets:
s.setblocking(1)
pool = Pool(self.worker_connections)
if self.server_class is not None:
self.server_class.base_env['wsgi.multiprocess'] = \
self.cfg.workers > 1
server = self.server_class(
s,
application=self.wsgi,
spawn=pool,
resource=self.resource,
log=self.log,
policy_server=self.policy_server,
handler_class=self.wsgi_handler,
ws_handler_class=self.ws_wsgi_handler,
**ssl_args
)
else:
hfun = partial(self.handle, s)
server = StreamServer(
s, handle=hfun, spawn=pool, **ssl_args)
server.start()
servers.append(server)
pid = os.getpid()
try:
while self.alive:
self.notify()
if pid == os.getpid() and self.ppid != os.getppid():
self.log.info(
"Parent changed, shutting down: %s", self)
break
gevent.sleep(1.0)
except KeyboardInterrupt:
pass
try:
# Stop accepting requests
[server.stop_accepting() for server in servers]
# Handle current requests until graceful_timeout
ts = time.time()
while time.time() - ts <= self.cfg.graceful_timeout:
accepting = 0
for server in servers:
if server.pool.free_count() != server.pool.size:
accepting += 1
if not accepting:
return
self.notify()
gevent.sleep(1.0)
# Force kill all active the handlers
self.log.warning("Worker graceful timeout (pid:%s)" % self.pid)
[server.stop(timeout=1) for server in servers]
except:
pass
else:
self.socket.setblocking(1)
pool = Pool(self.worker_connections)
self.server_class.base_env['wsgi.multiprocess'] = \
self.cfg.workers > 1
server = self.server_class(
self.socket,
application=self.wsgi,
spawn=pool,
resource=self.resource,
log=self.log,
policy_server=self.policy_server,
handler_class=self.wsgi_handler,
ws_handler_class=self.ws_wsgi_handler,
)
server.start()
pid = os.getpid()
try:
while self.alive:
self.notify()
if pid == os.getpid() and self.ppid != os.getppid():
self.log.info(
"Parent changed, shutting down: %s", self)
break
gevent.sleep(1.0)
except KeyboardInterrupt:
pass
try:
# Stop accepting requests
server.kill()
# Handle current requests until graceful_timeout
ts = time.time()
while time.time() - ts <= self.cfg.graceful_timeout:
if server.pool.free_count() == server.pool.size:
return # all requests was handled
self.notify()
gevent.sleep(1.0)
# Force kill all active the handlers
self.log.warning("Worker graceful timeout (pid:%s)" % self.pid)
server.stop(timeout=1)
except:
pass
class GeventSocketIOWorker(GeventSocketIOBaseWorker):
"""
Default gunicorn worker utilizing gevent
Uses the namespace 'socket.io' and defaults to the flash policy server
being disabled.
"""
server_class = SocketIOServer
wsgi_handler = GunicornWSGIHandler
ws_wsgi_handler = GunicornWebSocketWSGIHandler
# We need to define a namespace for the server, it would be nice if this
# was a configuration option, will probably end up how this implemented,
# for now this is just a proof of concept to make sure this will work
resource = 'socket.io'
policy_server = True
class NginxGeventSocketIOWorker(GeventSocketIOWorker):
"""
Worker which will not attempt to connect via websocket transport
Nginx is not compatible with websockets and therefore will not add the
wsgi.websocket key to the wsgi environment.
"""
transports = ['xhr-polling']
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