mirror of https://github.com/zulip/zulip.git
271 lines
11 KiB
Python
271 lines
11 KiB
Python
from django.conf import settings
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from zephyr.models import Message, UserProfile, UserMessage, \
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Recipient, Stream, get_stream
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from zephyr.decorator import JsonableError
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from zephyr.lib.cache_helpers import cache_get_message
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from zephyr.lib.queue import queue_json_publish
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import os
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import sys
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import logging
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import requests
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import simplejson
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import subprocess
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import collections
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from django.db import connection
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class Callbacks(object):
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# A user received a message. The key is user_profile.id.
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TYPE_USER_RECEIVE = 0
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# A stream received a message. The key is a tuple
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# (realm_id, lowercased stream name).
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# See comment attached to the global stream_messages for why.
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# Callers of this callback need to be careful to provide
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# a lowercased stream name.
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TYPE_STREAM_RECEIVE = 1
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# A user's pointer was updated. The key is user_profile.id.
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TYPE_POINTER_UPDATE = 2
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TYPE_MAX = 3
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def __init__(self):
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self.table = {}
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def add(self, key, cb_type, callback):
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if not self.table.has_key(key):
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self.create_key(key)
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self.table[key][cb_type].append(callback)
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def call(self, key, cb_type, **kwargs):
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if not self.table.has_key(key):
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self.create_key(key)
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for cb in self.table[key][cb_type]:
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cb(**kwargs)
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self.table[key][cb_type] = []
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def create_key(self, key):
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self.table[key] = [[] for i in range(0, Callbacks.TYPE_MAX)]
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callbacks_table = Callbacks()
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def add_user_receive_callback(user_profile, cb):
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callbacks_table.add(user_profile.id, Callbacks.TYPE_USER_RECEIVE, cb)
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def add_stream_receive_callback(realm_id, stream_name, cb):
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callbacks_table.add((realm_id, stream_name.lower()), Callbacks.TYPE_STREAM_RECEIVE, cb)
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def add_pointer_update_callback(user_profile, cb):
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callbacks_table.add(user_profile.id, Callbacks.TYPE_POINTER_UPDATE, cb)
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# in-process caching mechanism for tracking usermessages
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#
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# user table: Map user_profile_id => [deque of message ids he received]
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#
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# We don't use all the features of a deque -- the important ones are:
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# * O(1) insert of new highest message id
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# * O(k) read of highest k message ids
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# * Automatic maximum size support.
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#
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# stream table: Map (realm_id, lowercased stream name) => [deque of message ids it received]
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#
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# Why don't we index by the stream_id? Because the client will make a
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# request that specifies a particular realm and stream name, and since
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# we're running within tornado, we don't want to have to do a database
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# lookup to find the matching entry in this table.
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mtables = {
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'user': {},
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'stream': {},
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}
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USERMESSAGE_CACHE_COUNT = 25000
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STREAMMESSAGE_CACHE_COUNT = 5000
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cache_minimum_id = sys.maxint
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def initialize_user_messages():
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global cache_minimum_id
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try:
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cache_minimum_id = Message.objects.all().order_by("-id")[0].id - USERMESSAGE_CACHE_COUNT
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except Message.DoesNotExist:
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cache_minimum_id = 1
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# These next few lines implement the following Django ORM
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# algorithm using raw SQL:
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## for um in UserMessage.objects.filter(message_id__gte=cache_minimum_id).order_by("message"):
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## add_user_message(um.user_profile_id, um.message_id)
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# We do this because marshalling the Django objects is very
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# inefficient; total time consumed with the raw SQL is about
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# 600ms, vs. 3000ms-5000ms if we go through the ORM.
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cursor = connection.cursor()
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cursor.execute("SELECT user_profile_id, message_id from zephyr_usermessage " +
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"where message_id >= %s order by message_id", [cache_minimum_id])
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for row in cursor.fetchall():
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(user_profile_id, message_id) = row
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add_user_message(user_profile_id, message_id)
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streams = {}
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for stream in Stream.objects.select_related().all():
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streams[stream.id] = stream
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for m in (Message.objects.only("id", "recipient").select_related("recipient")
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.filter(id__gte=cache_minimum_id + (USERMESSAGE_CACHE_COUNT - STREAMMESSAGE_CACHE_COUNT),
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recipient__type=Recipient.STREAM).order_by("id")):
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stream = streams[m.recipient.type_id]
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add_stream_message(stream.realm.id, stream.name, m.id)
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if not settings.DEPLOYED:
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# Filling the memcached cache is a little slow, so do it in a child process.
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# For DEPLOYED cases, we run this from restart_server.
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subprocess.Popen(["python", os.path.join(os.path.dirname(__file__), "..", "manage.py"),
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"fill_memcached_caches"])
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def add_user_message(user_profile_id, message_id):
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add_table_message("user", user_profile_id, message_id)
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def add_stream_message(realm_id, stream_name, message_id):
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add_table_message("stream", (realm_id, stream_name.lower()), message_id)
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def add_table_message(table, key, message_id):
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if cache_minimum_id == sys.maxint:
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initialize_user_messages()
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mtables[table].setdefault(key, collections.deque(maxlen=400))
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mtables[table][key].appendleft(message_id)
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def fetch_user_messages(user_profile_id, last):
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return fetch_table_messages("user", user_profile_id, last)
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def fetch_stream_messages(realm_id, stream_name, last):
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return fetch_table_messages("stream", (realm_id, stream_name.lower()), last)
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def fetch_table_messages(table, key, last):
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if cache_minimum_id == sys.maxint:
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initialize_user_messages()
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# We need to initialize the deque here for any new users or
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# streams that were created since Tornado was started
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mtables[table].setdefault(key, collections.deque(maxlen=400))
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# We need to do this check after initialize_user_messages has been called.
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if len(mtables[table][key]) == 0:
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# Since the request contains a value of "last", we can assume
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# that the relevant user or stream has actually received a
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# message, which means that mtabes[table][key] will not remain
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# empty after the below completes.
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#
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# Thus, we will run this code at most once per key (user or
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# stream that is being lurked on). Further, we only do this
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# query for those keys that have not received a message since
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# cache_minimum_id. So we can afford to do a database query
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# from Tornado in this case.
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if table == "user":
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logging.info("tornado: Doing database query for user %d" % (key,),)
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for um in reversed(UserMessage.objects.filter(user_profile_id=key).order_by('-message')[:400]):
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add_user_message(um.user_profile_id, um.message_id)
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elif table == "stream":
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logging.info("tornado: Doing database query for stream %s" % (key,))
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(realm_id, stream_name) = key
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stream = get_stream(stream_name, realm_id)
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# If a buggy client submits a "last" value with a nonexistent stream,
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# do nothing (and proceed to longpoll) rather than crashing.
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if stream is not None:
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recipient = Recipient.objects.get(type=Recipient.STREAM, type_id=stream.id)
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for m in Message.objects.only("id", "recipient").filter(recipient=recipient).order_by("id")[:400]:
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add_stream_message(realm_id, stream_name, m.id)
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if len(mtables[table][key]) == 0:
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# Check the our assumption above that there are messages here.
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# If false, this may just mean a misbehaving client submitted
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# "last" even though it has no messages (in which case we
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# should proceed with longpolling by falling through). But it
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# could also be a server bug, so we log a warning.
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logging.warning("Unexpected empty message queue for key %s!" % (key,))
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elif last < mtables[table][key][-1]:
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# The user's client has a way-too-old value for 'last'
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# (presumably 400 messages old), we should return an error
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# The error handler for get_updates in zephyr.js parses this
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# message. If you change this message, you must update that
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# error handler.
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raise JsonableError("last value of %d too old! Minimum valid is %d!" %
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(last, mtables[table][key][-1]))
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message_list = []
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for message_id in mtables[table][key]:
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if message_id <= last:
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return reversed(message_list)
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message_list.append(message_id)
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return []
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# The user receives this message
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def user_receive_message(user_profile_id, message):
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add_user_message(user_profile_id, message.id)
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callbacks_table.call(user_profile_id, Callbacks.TYPE_USER_RECEIVE,
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messages=[message], update_types=["new_messages"])
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# The stream receives this message
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def stream_receive_message(realm_id, stream_name, message):
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add_stream_message(realm_id, stream_name, message.id)
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callbacks_table.call((realm_id, stream_name.lower()),
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Callbacks.TYPE_STREAM_RECEIVE,
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messages=[message], update_types=["new_messages"])
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# Simple caching implementation module for user pointers
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#
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# TODO: Write something generic in cache.py to support this
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# functionality? The current primitives there don't support storing
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# to the cache.
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user_pointers = {}
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def get_user_pointer(user_profile_id):
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if user_pointers == {}:
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# Once, on startup, fill in the user_pointers table with
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# everyone's current pointers
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for u in UserProfile.objects.all():
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user_pointers[u.id] = u.pointer
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if user_profile_id not in user_pointers:
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# This is a new user created since Tornado was started, so
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# they will have an initial pointer of -1.
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return -1
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return user_pointers[user_profile_id]
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def set_user_pointer(user_profile_id, pointer):
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user_pointers[user_profile_id] = pointer
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def update_pointer(user_profile_id, new_pointer):
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set_user_pointer(user_profile_id, new_pointer)
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callbacks_table.call(user_profile_id, Callbacks.TYPE_POINTER_UPDATE,
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new_pointer=new_pointer,
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update_types=["pointer_update"])
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def process_new_message(data):
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message = cache_get_message(data['message'])
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for user_profile_id in data['users']:
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user_receive_message(user_profile_id, message)
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if 'stream_name' in data:
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stream_receive_message(data['realm_id'], data['stream_name'], message)
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def process_notification(data):
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if data['type'] == 'new_message':
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process_new_message(data)
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elif data['type'] == 'pointer_update':
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update_pointer(data['user'], data['new_pointer'])
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else:
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raise JsonableError('bad notification type ' + data['type'])
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# Runs in the Django process to send a notification to Tornado.
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#
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# We use JSON rather than bare form parameters, so that we can represent
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# different types and for compatibility with non-HTTP transports.
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def send_notification_http(data):
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requests.post(settings.TORNADO_SERVER + '/notify_tornado', data=dict(
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data = simplejson.dumps(data),
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secret = settings.SHARED_SECRET))
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def send_notification(data):
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return queue_json_publish("notify_tornado", data, send_notification_http)
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