# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from twisted.internet import defer
from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.handlers.state_deltas import StateDeltasHandler
from synapse.metrics import event_processing_positions
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import UserID
from synapse.util.metrics import Measure
logger = logging.getLogger(__name__)
class StatsHandler(StateDeltasHandler):
"""Handles keeping the *_stats tables updated with a simple time-series of
information about the users, rooms and media on the server, such that admins
have some idea of who is consuming their resources.
Heavily derived from UserDirectoryHandler
"""
def __init__(self, hs):
super(StatsHandler, self).__init__(hs)
self.hs = hs
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.server_name = hs.hostname
self.clock = hs.get_clock()
self.notifier = hs.get_notifier()
self.is_mine_id = hs.is_mine_id
self.stats_bucket_size = hs.config.stats_bucket_size
# The current position in the current_state_delta stream
self.pos = None
# Guard to ensure we only process deltas one at a time
self._is_processing = False
if hs.config.stats_enabled:
self.notifier.add_replication_callback(self.notify_new_event)
# We kick this off so that we don't have to wait for a change before
# we start populating stats
self.clock.call_later(0, self.notify_new_event)
def notify_new_event(self):
"""Called when there may be more deltas to process
"""
if not self.hs.config.stats_enabled:
return
if self._is_processing:
return
@defer.inlineCallbacks
def process():
try:
yield self._unsafe_process()
finally:
self._is_processing = False
self._is_processing = True
run_as_background_process("stats.notify_new_event", process)
@defer.inlineCallbacks
def _unsafe_process(self):
# If self.pos is None then means we haven't fetched it from DB
if self.pos is None:
self.pos = yield self.store.get_stats_stream_pos()
# If still None then the initial background update hasn't happened yet
if self.pos is None:
return None
# Loop round handling deltas until we're up to date
while True:
with Measure(self.clock, "stats_delta"):
deltas = yield self.store.get_current_state_deltas(self.pos)
if not deltas:
return
logger.info("Handling %d state deltas", len(deltas))
yield self._handle_deltas(deltas)
self.pos = deltas[-1]["stream_id"]
yield self.store.update_stats_stream_pos(self.pos)
event_processing_positions.labels("stats").set(self.pos)
@defer.inlineCallbacks
def _handle_deltas(self, deltas):
"""
Called with the state deltas to process
"""
for delta in deltas:
typ = delta["type"]
state_key = delta["state_key"]
room_id = delta["room_id"]
event_id = delta["event_id"]
stream_id = delta["stream_id"]
prev_event_id = delta["prev_event_id"]
stream_pos = delta["stream_id"]
logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
token = yield self.store.get_earliest_token_for_room_stats(room_id)
# If the earliest token to begin from is larger than our current
# stream ID, skip processing this delta.
if token is not None and token >= stream_id:
logger.debug(
"Ignoring: %s as earlier than this room's initial ingestion event",
event_id,
)
continue
if event_id is None and prev_event_id is None:
# Errr...
continue
event_content = {}
if event_id is not None:
event = yield self.store.get_event(event_id, allow_none=True)
if event:
event_content = event.content or {}
# We use stream_pos here rather than fetch by event_id as event_id
# may be None
now = yield self.store.get_received_ts_by_stream_pos(stream_pos)
# quantise time to the nearest bucket
now = (now // 1000 // self.stats_bucket_size) * self.stats_bucket_size
if typ == EventTypes.Member:
# we could use _get_key_change here but it's a bit inefficient
# given we're not testing for a specific result; might as well
# just grab the prev_membership and membership strings and
# compare them.
prev_event_content = {}
if prev_event_id is not None:
prev_event = yield self.store.get_event(
prev_event_id, allow_none=True
)
if prev_event:
prev_event_content = prev_event.content
membership = event_content.get("membership", Membership.LEAVE)
prev_membership = prev_event_content.get("membership", Membership.LEAVE)
if prev_membership == membership:
continue
if prev_membership == Membership.JOIN:
yield self.store.update_stats_delta(
now, "room", room_id, "joined_members", -1
)
elif prev_membership == Membership.INVITE:
yield self.store.update_stats_delta(
now, "room", room_id, "invited_members", -1
)
elif prev_membership == Membership.LEAVE:
yield self.store.update_stats_delta(
now, "room", room_id, "left_members", -1
)
elif prev_membership == Membership.BAN:
yield self.store.update_stats_delta(
now, "room", room_id, "banned_members", -1
)
else:
err = "%s is not a valid prev_membership" % (repr(prev_membership),)
logger.error(err)
raise ValueError(err)
if membership == Membership.JOIN:
yield self.store.update_stats_delta(
now, "room", room_id, "joined_members", +1
)
elif membership == Membership.INVITE:
yield self.store.update_stats_delta(
now, "room", room_id, "invited_members", +1
)
elif membership == Membership.LEAVE:
yield self.store.update_stats_delta(
now, "room", room_id, "left_members", +1
)
elif membership == Membership.BAN:
yield self.store.update_stats_delta(
now, "room", room_id, "banned_members", +1
)
else:
err = "%s is not a valid membership" % (repr(membership),)
logger.error(err)
raise ValueError(err)
user_id = state_key
if self.is_mine_id(user_id):
# update user_stats as it's one of our users
public = yield self._is_public_room(room_id)
if membership == Membership.LEAVE:
yield self.store.update_stats_delta(
now,
"user",
user_id,
"public_rooms" if public else "private_rooms",
-1,
)
elif membership == Membership.JOIN:
yield self.store.update_stats_delta(
now,
"user",
user_id,
"public_rooms" if public else "private_rooms",
+1,
)
elif typ == EventTypes.Create:
# Newly created room. Add it with all blank portions.
yield self.store.update_room_state(
room_id,
{
"join_rules": None,
"history_visibility": None,
"encryption": None,
"name": None,
"topic": None,
"avatar": None,
"canonical_alias": None,
},
)
elif typ == EventTypes.JoinRules:
yield self.store.update_room_state(
room_id, {"join_rules": event_content.get("join_rule")}
)
is_public = yield self._get_key_change(
prev_event_id, event_id, "join_rule", JoinRules.PUBLIC
)
if is_public is not None:
yield self.update_public_room_stats(now, room_id, is_public)
elif typ == EventTypes.RoomHistoryVisibility:
yield self.store.update_room_state(
room_id,
{"history_visibility": event_content.get("history_visibility")},
)
is_public = yield self._get_key_change(
prev_event_id, event_id, "history_visibility", "world_readable"
)
if is_public is not None:
yield self.update_public_room_stats(now, room_id, is_public)
elif typ == EventTypes.Encryption:
yield self.store.update_room_state(
room_id, {"encryption": event_content.get("algorithm")}
)
elif typ == EventTypes.Name:
yield self.store.update_room_state(
room_id, {"name": event_content.get("name")}
)
elif typ == EventTypes.Topic:
yield self.store.update_room_state(
room_id, {"topic": event_content.get("topic")}
)
elif typ == EventTypes.RoomAvatar:
yield self.store.update_room_state(
room_id, {"avatar": event_content.get("url")}
)
elif typ == EventTypes.CanonicalAlias:
yield self.store.update_room_state(
room_id, {"canonical_alias": event_content.get("alias")}
)
@defer.inlineCallbacks
def update_public_room_stats(self, ts, room_id, is_public):
"""
Increment/decrement a user's number of public rooms when a room they are
in changes to/from public visibility.
Args:
ts (int): Timestamp in seconds
room_id (str)
is_public (bool)
"""
# For now, blindly iterate over all local users in the room so that
# we can handle the whole problem of copying buckets over as needed
user_ids = yield self.store.get_users_in_room(room_id)
for user_id in user_ids:
if self.hs.is_mine(UserID.from_string(user_id)):
yield self.store.update_stats_delta(
ts, "user", user_id, "public_rooms", +1 if is_public else -1
)
yield self.store.update_stats_delta(
ts, "user", user_id, "private_rooms", -1 if is_public else +1
)
@defer.inlineCallbacks
def _is_public_room(self, room_id):
join_rules = yield self.state.get_current_state(room_id, EventTypes.JoinRules)
history_visibility = yield self.state.get_current_state(
room_id, EventTypes.RoomHistoryVisibility
)
if (join_rules and join_rules.content.get("join_rule") == JoinRules.PUBLIC) or (
(
history_visibility
and history_visibility.content.get("history_visibility")
== "world_readable"
)
):
return True
else:
return False