mirror of https://github.com/zulip/zulip.git
292 lines
10 KiB
Python
292 lines
10 KiB
Python
from __future__ import absolute_import
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from django.conf import settings
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from collections import deque
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import os
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import time
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import socket
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import logging
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import ujson
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import requests
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import cPickle as pickle
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import atexit
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import sys
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import signal
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import tornado
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import random
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from zerver.lib.utils import statsd
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from zerver.middleware import async_request_restart
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from zerver.models import get_client
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# The idle timeout used to be a week, but we found that in that
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# situation, queues from dead browser sessions would grow quite large
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# due to the accumulation of message data in those queues.
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IDLE_EVENT_QUEUE_TIMEOUT_SECS = 60 * 10
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EVENT_QUEUE_GC_FREQ_MSECS = 1000 * 60 * 5
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# Capped limit for how long a client can request an event queue
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# to live
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MAX_QUEUE_TIMEOUT_SECS = 7 * 24 * 60 * 60
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# The heartbeats effectively act as a server-side timeout for
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# get_events(). The actual timeout value is randomized for each
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# client connection based on the below value. We ensure that the
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# maximum timeout value is 55 seconds, to deal with crappy home
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# wireless routers that kill "inactive" http connections.
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HEARTBEAT_MIN_FREQ_SECS = 45
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class ClientDescriptor(object):
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def __init__(self, user_profile_id, id, event_types, client_type,
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apply_markdown=True, lifespan_secs=0):
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self.user_profile_id = user_profile_id
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self.current_handler = None
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self.event_queue = EventQueue(id)
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self.queue_timeout = lifespan_secs
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self.event_types = event_types
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self.last_connection_time = time.time()
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self.apply_markdown = apply_markdown
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self.client_type = client_type
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self._timeout_handle = None
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# Clamp queue_timeout to between minimum and maximum timeouts
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self.queue_timeout = max(IDLE_EVENT_QUEUE_TIMEOUT_SECS, min(self.queue_timeout, MAX_QUEUE_TIMEOUT_SECS))
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def prepare_for_pickling(self):
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self.current_handler = None
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self._timeout_handle = None
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def add_event(self, event):
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if self.current_handler is not None:
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async_request_restart(self.current_handler._request)
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self.event_queue.push(event)
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if self.current_handler is not None:
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try:
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self.current_handler.zulip_finish(dict(result='success', msg='',
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events=[event],
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queue_id=self.event_queue.id),
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self.current_handler._request,
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apply_markdown=self.apply_markdown)
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except socket.error:
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pass
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self.disconnect_handler()
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def accepts_event_type(self, type):
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if self.event_types is None:
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return True
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return type in self.event_types
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def idle(self, now):
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if not hasattr(self, 'queue_timeout'):
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self.queue_timeout = IDLE_EVENT_QUEUE_TIMEOUT_SECS
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return (self.current_handler is None
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and now - self.last_connection_time >= self.queue_timeout)
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def connect_handler(self, handler):
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self.current_handler = handler
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self.last_connection_time = time.time()
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def timeout_callback():
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self._timeout_handle = None
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# All clients get heartbeat events
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self.add_event(dict(type='heartbeat'))
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ioloop = tornado.ioloop.IOLoop.instance()
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heartbeat_time = time.time() + HEARTBEAT_MIN_FREQ_SECS + random.randint(0, 10)
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self._timeout_handle = ioloop.add_timeout(heartbeat_time, timeout_callback)
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def disconnect_handler(self):
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self.current_handler = None
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if self._timeout_handle is not None:
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ioloop = tornado.ioloop.IOLoop.instance()
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ioloop.remove_timeout(self._timeout_handle)
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self._timeout_handle = None
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class EventQueue(object):
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def __init__(self, id):
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self.queue = deque()
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self.next_event_id = 0
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self.id = id
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def push(self, event):
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event['id'] = self.next_event_id
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self.next_event_id += 1
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self.queue.append(event)
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def pop(self):
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return self.queue.popleft()
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def empty(self):
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return len(self.queue) == 0
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def prune(self, through_id):
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while not self.empty() and self.queue[0]['id'] <= through_id:
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self.pop()
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def contents(self):
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return list(self.queue)
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# maps queue ids to client descriptors
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clients = {}
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# maps user id to list of client descriptors
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user_clients = {}
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# list of registered gc hooks.
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# each one will be called with a user profile id, queue, and bool
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# last_for_client that is true if this is the last queue pertaining
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# to this user_profile_id
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# that is about to be deleted
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gc_hooks = []
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next_queue_id = 0
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def add_client_gc_hook(hook):
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gc_hooks.append(hook)
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def get_client_descriptor(queue_id):
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return clients.get(queue_id)
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def get_client_descriptors_for_user(user_profile_id):
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return user_clients.get(user_profile_id, [])
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def allocate_client_descriptor(user_profile_id, event_types, client_type,
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apply_markdown, lifespan_secs):
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global next_queue_id
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id = str(settings.SERVER_GENERATION) + ':' + str(next_queue_id)
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next_queue_id += 1
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client = ClientDescriptor(user_profile_id, id, event_types, client_type,
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apply_markdown, lifespan_secs)
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clients[id] = client
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user_clients.setdefault(user_profile_id, []).append(client)
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return client
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def gc_event_queues():
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start = time.time()
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to_remove = set()
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affected_users = set()
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for (id, client) in clients.iteritems():
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if client.idle(start):
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to_remove.add(id)
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affected_users.add(client.user_profile_id)
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for user_id in affected_users:
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new_client_list = filter(lambda c: c.event_queue.id not in to_remove,
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user_clients[user_id])
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if len(new_client_list) == 0:
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del user_clients[user_id]
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else:
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user_clients[user_id] = new_client_list
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for id in to_remove:
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for cb in gc_hooks:
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cb(clients[id].user_profile_id, clients[id], clients[id].user_profile_id not in user_clients)
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del clients[id]
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logging.info(('Tornado removed %d idle event queues owned by %d users in %.3fs.'
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+ ' Now %d active queues')
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% (len(to_remove), len(affected_users), time.time() - start,
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len(clients)))
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statsd.gauge('tornado.active_queues', len(clients))
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statsd.gauge('tornado.active_users', len(user_clients))
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def dump_event_queues():
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start = time.time()
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# Remove unpickle-able attributes
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for client in clients.itervalues():
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client.prepare_for_pickling()
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with file(settings.PERSISTENT_QUEUE_FILENAME, "w") as stored_queues:
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pickle.dump(clients, stored_queues)
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logging.info('Tornado dumped %d event queues in %.3fs'
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% (len(clients), time.time() - start))
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def load_event_queues():
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global clients
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start = time.time()
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try:
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with file(settings.PERSISTENT_QUEUE_FILENAME, "r") as stored_queues:
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clients = pickle.load(stored_queues)
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except (IOError, EOFError):
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pass
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for client in clients.itervalues():
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# The following client_type block can be dropped once we've
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# cleared out all our old event queues
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if not hasattr(client, 'client_type'):
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client.client_type = get_client("website")
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user_clients.setdefault(client.user_profile_id, []).append(client)
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logging.info('Tornado loaded %d event queues in %.3fs'
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% (len(clients), time.time() - start))
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def send_restart_events():
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event = dict(type='restart', server_generation=settings.SERVER_GENERATION)
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for client in clients.itervalues():
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# All clients get restart events
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client.add_event(event.copy())
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def setup_event_queue():
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load_event_queues()
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atexit.register(dump_event_queues)
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# Make sure we dump event queues even if we exit via signal
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signal.signal(signal.SIGTERM, lambda signum, stack: sys.exit(1))
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try:
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os.remove(settings.PERSISTENT_QUEUE_FILENAME)
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except OSError:
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pass
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# Set up event queue garbage collection
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ioloop = tornado.ioloop.IOLoop.instance()
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pc = tornado.ioloop.PeriodicCallback(gc_event_queues,
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EVENT_QUEUE_GC_FREQ_MSECS, ioloop)
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pc.start()
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send_restart_events()
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# The following functions are called from Django
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# Workaround to support the Python-requests 1.0 transition of .json
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# from a property to a function
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requests_json_is_function = callable(requests.Response.json)
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def extract_json_response(resp):
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if requests_json_is_function:
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return resp.json()
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else:
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return resp.json
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def request_event_queue(user_profile, user_client, apply_markdown,
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queue_lifespan_secs, event_types=None):
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if settings.TORNADO_SERVER:
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req = {'dont_block' : 'true',
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'apply_markdown': ujson.dumps(apply_markdown),
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'client' : 'internal',
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'user_client' : user_client.name,
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'lifespan_secs' : queue_lifespan_secs}
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if event_types is not None:
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req['event_types'] = ujson.dumps(event_types)
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resp = requests.get(settings.TORNADO_SERVER + '/api/v1/events',
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auth=requests.auth.HTTPBasicAuth(user_profile.email,
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user_profile.api_key),
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params=req)
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resp.raise_for_status()
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return extract_json_response(resp)['queue_id']
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return None
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def get_user_events(user_profile, queue_id, last_event_id):
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if settings.TORNADO_SERVER:
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resp = requests.get(settings.TORNADO_SERVER + '/api/v1/events',
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auth=requests.auth.HTTPBasicAuth(user_profile.email,
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user_profile.api_key),
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params={'queue_id' : queue_id,
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'last_event_id': last_event_id,
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'dont_block' : 'true',
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'client' : 'internal'})
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resp.raise_for_status()
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return extract_json_response(resp)['events']
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