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# -*- coding: utf-8 -
#
# This file is part of gunicorn released under the MIT license.
# See the NOTICE for more information.
import os
import sys
try:
import tornado
except ImportError:
raise RuntimeError("You need tornado installed to use this worker.")
import tornado.web
import tornado.httpserver
from tornado.ioloop import IOLoop, PeriodicCallback
from tornado.wsgi import WSGIContainer
from gunicorn.workers.base import Worker
from gunicorn import __version__ as gversion
from gunicorn.sock import ssl_context
# Tornado 5.0 updated its IOLoop, and the `io_loop` arguments to many
# Tornado functions have been removed in Tornado 5.0. Also, they no
# longer store PeriodCallbacks in ioloop._callbacks. Instead we store
# them on our side, and use stop() on them when stopping the worker.
# See https://www.tornadoweb.org/en/stable/releases/v5.0.0.html#backwards-compatibility-notes
# for more details.
TORNADO5 = tornado.version_info >= (5, 0, 0)
class TornadoWorker(Worker):
@classmethod
def setup(cls):
web = sys.modules.pop("tornado.web")
old_clear = web.RequestHandler.clear
def clear(self):
old_clear(self)
if "Gunicorn" not in self._headers["Server"]:
self._headers["Server"] += " (Gunicorn/%s)" % gversion
web.RequestHandler.clear = clear
sys.modules["tornado.web"] = web
def handle_exit(self, sig, frame):
if self.alive:
super().handle_exit(sig, frame)
def handle_request(self):
self.nr += 1
if self.alive and self.nr >= self.max_requests:
self.log.info("Autorestarting worker after current request.")
self.alive = False
def watchdog(self):
if self.alive:
self.notify()
if self.ppid != os.getppid():
self.log.info("Parent changed, shutting down: %s", self)
self.alive = False
def heartbeat(self):
if not self.alive:
if self.server_alive:
if hasattr(self, 'server'):
try:
self.server.stop()
except Exception:
pass
self.server_alive = False
else:
if TORNADO5:
for callback in self.callbacks:
callback.stop()
self.ioloop.stop()
else:
if not self.ioloop._callbacks:
self.ioloop.stop()
def init_process(self):
# IOLoop cannot survive a fork or be shared across processes
# in any way. When multiple processes are being used, each process
# should create its own IOLoop. We should clear current IOLoop
# if exists before os.fork.
IOLoop.clear_current()
super().init_process()
def run(self):
self.ioloop = IOLoop.instance()
self.alive = True
self.server_alive = False
if TORNADO5:
self.callbacks = []
self.callbacks.append(PeriodicCallback(self.watchdog, 1000))
self.callbacks.append(PeriodicCallback(self.heartbeat, 1000))
for callback in self.callbacks:
callback.start()
else:
PeriodicCallback(self.watchdog, 1000, io_loop=self.ioloop).start()
PeriodicCallback(self.heartbeat, 1000, io_loop=self.ioloop).start()
# Assume the app is a WSGI callable if its not an
# instance of tornado.web.Application or is an
# instance of tornado.wsgi.WSGIApplication
app = self.wsgi
if tornado.version_info[0] < 6:
if not isinstance(app, tornado.web.Application) or \
isinstance(app, tornado.wsgi.WSGIApplication):
app = WSGIContainer(app)
elif not isinstance(app, WSGIContainer) and \
not isinstance(app, tornado.web.Application):
app = WSGIContainer(app)
# Monkey-patching HTTPConnection.finish to count the
# number of requests being handled by Tornado. This
# will help gunicorn shutdown the worker if max_requests
# is exceeded.
httpserver = sys.modules["tornado.httpserver"]
if hasattr(httpserver, 'HTTPConnection'):
old_connection_finish = httpserver.HTTPConnection.finish
def finish(other):
self.handle_request()
old_connection_finish(other)
httpserver.HTTPConnection.finish = finish
sys.modules["tornado.httpserver"] = httpserver
server_class = tornado.httpserver.HTTPServer
else:
class _HTTPServer(tornado.httpserver.HTTPServer):
def on_close(instance, server_conn):
self.handle_request()
super(_HTTPServer, instance).on_close(server_conn)
server_class = _HTTPServer
if self.cfg.is_ssl:
if TORNADO5:
server = server_class(app, ssl_options=ssl_context(self.cfg))
else:
server = server_class(app, io_loop=self.ioloop,
ssl_options=ssl_context(self.cfg))
else:
if TORNADO5:
server = server_class(app)
else:
server = server_class(app, io_loop=self.ioloop)
self.server = server
self.server_alive = True
for s in self.sockets:
s.setblocking(0)
if hasattr(server, "add_socket"): # tornado > 2.0
server.add_socket(s)
elif hasattr(server, "_sockets"): # tornado 2.0
server._sockets[s.fileno()] = s
server.no_keep_alive = self.cfg.keepalive <= 0
server.start(num_processes=1)
self.ioloop.start()
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