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anonymousland-synapse/synapse/storage/event_push_actions.py
Richard van der Hoff 9255a6cb17 Improve exception handling for background processes 
There were a bunch of places where we fire off a process to happen in the
background, but don't have any exception handling on it - instead relying on
the unhandled error being logged when the relevent deferred gets
garbage-collected.

This is unsatisfactory for a number of reasons:
 - logging on garbage collection is best-effort and may happen some time after
   the error, if at all
 - it can be hard to figure out where the error actually happened.
 - it is logged as a scary CRITICAL error which (a) I always forget to grep for
   and (b) it's not really CRITICAL if a background process we don't care about
   fails.

So this is an attempt to add exception handling to everything we fire off into
the background.
2018-04-27 11:07:40 +01:00

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# -*- coding: utf-8 -*-
# Copyright 2015 OpenMarket Ltd
# 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.
from synapse.storage._base import SQLBaseStore, LoggingTransaction
from twisted.internet import defer
from synapse.util.async import sleep
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.types import RoomStreamToken
from .stream import lower_bound
import logging
import simplejson as json
logger = logging.getLogger(__name__)
DEFAULT_NOTIF_ACTION = ["notify", {"set_tweak": "highlight", "value": False}]
DEFAULT_HIGHLIGHT_ACTION = [
"notify", {"set_tweak": "sound", "value": "default"}, {"set_tweak": "highlight"}
]
def _serialize_action(actions, is_highlight):
"""Custom serializer for actions. This allows us to "compress" common actions.
We use the fact that most users have the same actions for notifs (and for
highlights).
We store these default actions as the empty string rather than the full JSON.
Since the empty string isn't valid JSON there is no risk of this clashing with
any real JSON actions
"""
if is_highlight:
if actions == DEFAULT_HIGHLIGHT_ACTION:
return "" # We use empty string as the column is non-NULL
else:
if actions == DEFAULT_NOTIF_ACTION:
return ""
return json.dumps(actions)
def _deserialize_action(actions, is_highlight):
"""Custom deserializer for actions. This allows us to "compress" common actions
"""
if actions:
return json.loads(actions)
if is_highlight:
return DEFAULT_HIGHLIGHT_ACTION
else:
return DEFAULT_NOTIF_ACTION
class EventPushActionsWorkerStore(SQLBaseStore):
def __init__(self, db_conn, hs):
super(EventPushActionsWorkerStore, self).__init__(db_conn, hs)
# These get correctly set by _find_stream_orderings_for_times_txn
self.stream_ordering_month_ago = None
self.stream_ordering_day_ago = None
cur = LoggingTransaction(
db_conn.cursor(),
name="_find_stream_orderings_for_times_txn",
database_engine=self.database_engine,
after_callbacks=[],
exception_callbacks=[],
)
self._find_stream_orderings_for_times_txn(cur)
cur.close()
self.find_stream_orderings_looping_call = self._clock.looping_call(
self._find_stream_orderings_for_times, 10 * 60 * 1000
)
@cachedInlineCallbacks(num_args=3, tree=True, max_entries=5000)
def get_unread_event_push_actions_by_room_for_user(
self, room_id, user_id, last_read_event_id
):
ret = yield self.runInteraction(
"get_unread_event_push_actions_by_room",
self._get_unread_counts_by_receipt_txn,
room_id, user_id, last_read_event_id
)
defer.returnValue(ret)
def _get_unread_counts_by_receipt_txn(self, txn, room_id, user_id,
last_read_event_id):
sql = (
"SELECT stream_ordering, topological_ordering"
" FROM events"
" WHERE room_id = ? AND event_id = ?"
)
txn.execute(
sql, (room_id, last_read_event_id)
)
results = txn.fetchall()
if len(results) == 0:
return {"notify_count": 0, "highlight_count": 0}
stream_ordering = results[0][0]
topological_ordering = results[0][1]
return self._get_unread_counts_by_pos_txn(
txn, room_id, user_id, topological_ordering, stream_ordering
)
def _get_unread_counts_by_pos_txn(self, txn, room_id, user_id, topological_ordering,
stream_ordering):
token = RoomStreamToken(
topological_ordering, stream_ordering
)
# First get number of notifications.
# We don't need to put a notif=1 clause as all rows always have
# notif=1
sql = (
"SELECT count(*)"
" FROM event_push_actions ea"
" WHERE"
" user_id = ?"
" AND room_id = ?"
" AND %s"
) % (lower_bound(token, self.database_engine, inclusive=False),)
txn.execute(sql, (user_id, room_id))
row = txn.fetchone()
notify_count = row[0] if row else 0
txn.execute("""
SELECT notif_count FROM event_push_summary
WHERE room_id = ? AND user_id = ? AND stream_ordering > ?
""", (room_id, user_id, stream_ordering,))
rows = txn.fetchall()
if rows:
notify_count += rows[0][0]
# Now get the number of highlights
sql = (
"SELECT count(*)"
" FROM event_push_actions ea"
" WHERE"
" highlight = 1"
" AND user_id = ?"
" AND room_id = ?"
" AND %s"
) % (lower_bound(token, self.database_engine, inclusive=False),)
txn.execute(sql, (user_id, room_id))
row = txn.fetchone()
highlight_count = row[0] if row else 0
return {
"notify_count": notify_count,
"highlight_count": highlight_count,
}
@defer.inlineCallbacks
def get_push_action_users_in_range(self, min_stream_ordering, max_stream_ordering):
def f(txn):
sql = (
"SELECT DISTINCT(user_id) FROM event_push_actions WHERE"
" stream_ordering >= ? AND stream_ordering <= ?"
)
txn.execute(sql, (min_stream_ordering, max_stream_ordering))
return [r[0] for r in txn]
ret = yield self.runInteraction("get_push_action_users_in_range", f)
defer.returnValue(ret)
@defer.inlineCallbacks
def get_unread_push_actions_for_user_in_range_for_http(
self, user_id, min_stream_ordering, max_stream_ordering, limit=20
):
"""Get a list of the most recent unread push actions for a given user,
within the given stream ordering range. Called by the httppusher.
Args:
user_id (str): The user to fetch push actions for.
min_stream_ordering(int): The exclusive lower bound on the
stream ordering of event push actions to fetch.
max_stream_ordering(int): The inclusive upper bound on the
stream ordering of event push actions to fetch.
limit (int): The maximum number of rows to return.
Returns:
A promise which resolves to a list of dicts with the keys "event_id",
"room_id", "stream_ordering", "actions".
The list will be ordered by ascending stream_ordering.
The list will have between 0~limit entries.
"""
# find rooms that have a read receipt in them and return the next
# push actions
def get_after_receipt(txn):
# find rooms that have a read receipt in them and return the next
# push actions
sql = (
"SELECT ep.event_id, ep.room_id, ep.stream_ordering, ep.actions,"
" ep.highlight "
" FROM ("
" SELECT room_id,"
" MAX(topological_ordering) as topological_ordering,"
" MAX(stream_ordering) as stream_ordering"
" FROM events"
" INNER JOIN receipts_linearized USING (room_id, event_id)"
" WHERE receipt_type = 'm.read' AND user_id = ?"
" GROUP BY room_id"
") AS rl,"
" event_push_actions AS ep"
" WHERE"
" ep.room_id = rl.room_id"
" AND ("
" ep.topological_ordering > rl.topological_ordering"
" OR ("
" ep.topological_ordering = rl.topological_ordering"
" AND ep.stream_ordering > rl.stream_ordering"
" )"
" )"
" AND ep.user_id = ?"
" AND ep.stream_ordering > ?"
" AND ep.stream_ordering <= ?"
" ORDER BY ep.stream_ordering ASC LIMIT ?"
)
args = [
user_id, user_id,
min_stream_ordering, max_stream_ordering, limit,
]
txn.execute(sql, args)
return txn.fetchall()
after_read_receipt = yield self.runInteraction(
"get_unread_push_actions_for_user_in_range_http_arr", get_after_receipt
)
# There are rooms with push actions in them but you don't have a read receipt in
# them e.g. rooms you've been invited to, so get push actions for rooms which do
# not have read receipts in them too.
def get_no_receipt(txn):
sql = (
"SELECT ep.event_id, ep.room_id, ep.stream_ordering, ep.actions,"
" ep.highlight "
" FROM event_push_actions AS ep"
" INNER JOIN events AS e USING (room_id, event_id)"
" WHERE"
" ep.room_id NOT IN ("
" SELECT room_id FROM receipts_linearized"
" WHERE receipt_type = 'm.read' AND user_id = ?"
" GROUP BY room_id"
" )"
" AND ep.user_id = ?"
" AND ep.stream_ordering > ?"
" AND ep.stream_ordering <= ?"
" ORDER BY ep.stream_ordering ASC LIMIT ?"
)
args = [
user_id, user_id,
min_stream_ordering, max_stream_ordering, limit,
]
txn.execute(sql, args)
return txn.fetchall()
no_read_receipt = yield self.runInteraction(
"get_unread_push_actions_for_user_in_range_http_nrr", get_no_receipt
)
notifs = [
{
"event_id": row[0],
"room_id": row[1],
"stream_ordering": row[2],
"actions": _deserialize_action(row[3], row[4]),
} for row in after_read_receipt + no_read_receipt
]
# Now sort it so it's ordered correctly, since currently it will
# contain results from the first query, correctly ordered, followed
# by results from the second query, but we want them all ordered
# by stream_ordering, oldest first.
notifs.sort(key=lambda r: r['stream_ordering'])
# Take only up to the limit. We have to stop at the limit because
# one of the subqueries may have hit the limit.
defer.returnValue(notifs[:limit])
@defer.inlineCallbacks
def get_unread_push_actions_for_user_in_range_for_email(
self, user_id, min_stream_ordering, max_stream_ordering, limit=20
):
"""Get a list of the most recent unread push actions for a given user,
within the given stream ordering range. Called by the emailpusher
Args:
user_id (str): The user to fetch push actions for.
min_stream_ordering(int): The exclusive lower bound on the
stream ordering of event push actions to fetch.
max_stream_ordering(int): The inclusive upper bound on the
stream ordering of event push actions to fetch.
limit (int): The maximum number of rows to return.
Returns:
A promise which resolves to a list of dicts with the keys "event_id",
"room_id", "stream_ordering", "actions", "received_ts".
The list will be ordered by descending received_ts.
The list will have between 0~limit entries.
"""
# find rooms that have a read receipt in them and return the most recent
# push actions
def get_after_receipt(txn):
sql = (
"SELECT ep.event_id, ep.room_id, ep.stream_ordering, ep.actions,"
" ep.highlight, e.received_ts"
" FROM ("
" SELECT room_id,"
" MAX(topological_ordering) as topological_ordering,"
" MAX(stream_ordering) as stream_ordering"
" FROM events"
" INNER JOIN receipts_linearized USING (room_id, event_id)"
" WHERE receipt_type = 'm.read' AND user_id = ?"
" GROUP BY room_id"
") AS rl,"
" event_push_actions AS ep"
" INNER JOIN events AS e USING (room_id, event_id)"
" WHERE"
" ep.room_id = rl.room_id"
" AND ("
" ep.topological_ordering > rl.topological_ordering"
" OR ("
" ep.topological_ordering = rl.topological_ordering"
" AND ep.stream_ordering > rl.stream_ordering"
" )"
" )"
" AND ep.user_id = ?"
" AND ep.stream_ordering > ?"
" AND ep.stream_ordering <= ?"
" ORDER BY ep.stream_ordering DESC LIMIT ?"
)
args = [
user_id, user_id,
min_stream_ordering, max_stream_ordering, limit,
]
txn.execute(sql, args)
return txn.fetchall()
after_read_receipt = yield self.runInteraction(
"get_unread_push_actions_for_user_in_range_email_arr", get_after_receipt
)
# There are rooms with push actions in them but you don't have a read receipt in
# them e.g. rooms you've been invited to, so get push actions for rooms which do
# not have read receipts in them too.
def get_no_receipt(txn):
sql = (
"SELECT ep.event_id, ep.room_id, ep.stream_ordering, ep.actions,"
" ep.highlight, e.received_ts"
" FROM event_push_actions AS ep"
" INNER JOIN events AS e USING (room_id, event_id)"
" WHERE"
" ep.room_id NOT IN ("
" SELECT room_id FROM receipts_linearized"
" WHERE receipt_type = 'm.read' AND user_id = ?"
" GROUP BY room_id"
" )"
" AND ep.user_id = ?"
" AND ep.stream_ordering > ?"
" AND ep.stream_ordering <= ?"
" ORDER BY ep.stream_ordering DESC LIMIT ?"
)
args = [
user_id, user_id,
min_stream_ordering, max_stream_ordering, limit,
]
txn.execute(sql, args)
return txn.fetchall()
no_read_receipt = yield self.runInteraction(
"get_unread_push_actions_for_user_in_range_email_nrr", get_no_receipt
)
# Make a list of dicts from the two sets of results.
notifs = [
{
"event_id": row[0],
"room_id": row[1],
"stream_ordering": row[2],
"actions": _deserialize_action(row[3], row[4]),
"received_ts": row[5],
} for row in after_read_receipt + no_read_receipt
]
# Now sort it so it's ordered correctly, since currently it will
# contain results from the first query, correctly ordered, followed
# by results from the second query, but we want them all ordered
# by received_ts (most recent first)
notifs.sort(key=lambda r: -(r['received_ts'] or 0))
# Now return the first `limit`
defer.returnValue(notifs[:limit])
def add_push_actions_to_staging(self, event_id, user_id_actions):
"""Add the push actions for the event to the push action staging area.
Args:
event_id (str)
user_id_actions (dict[str, list[dict|str])]): A dictionary mapping
user_id to list of push actions, where an action can either be
a string or dict.
Returns:
Deferred
"""
if not user_id_actions:
return
# This is a helper function for generating the necessary tuple that
# can be used to inert into the `event_push_actions_staging` table.
def _gen_entry(user_id, actions):
is_highlight = 1 if _action_has_highlight(actions) else 0
return (
event_id, # event_id column
user_id, # user_id column
_serialize_action(actions, is_highlight), # actions column
1, # notif column
is_highlight, # highlight column
)
def _add_push_actions_to_staging_txn(txn):
# We don't use _simple_insert_many here to avoid the overhead
# of generating lists of dicts.
sql = """
INSERT INTO event_push_actions_staging
(event_id, user_id, actions, notif, highlight)
VALUES (?, ?, ?, ?, ?)
"""
txn.executemany(sql, (
_gen_entry(user_id, actions)
for user_id, actions in user_id_actions.iteritems()
))
return self.runInteraction(
"add_push_actions_to_staging", _add_push_actions_to_staging_txn
)
@defer.inlineCallbacks
def remove_push_actions_from_staging(self, event_id):
"""Called if we failed to persist the event to ensure that stale push
actions don't build up in the DB
Args:
event_id (str)
"""
try:
res = yield self._simple_delete(
table="event_push_actions_staging",
keyvalues={
"event_id": event_id,
},
desc="remove_push_actions_from_staging",
)
defer.returnValue(res)
except Exception:
# this method is called from an exception handler, so propagating
# another exception here really isn't helpful - there's nothing
# the caller can do about it. Just log the exception and move on.
logger.exception(
"Error removing push actions after event persistence failure",
)
@defer.inlineCallbacks
def _find_stream_orderings_for_times(self):
yield self.runInteraction(
"_find_stream_orderings_for_times",
self._find_stream_orderings_for_times_txn
)
def _find_stream_orderings_for_times_txn(self, txn):
logger.info("Searching for stream ordering 1 month ago")
self.stream_ordering_month_ago = self._find_first_stream_ordering_after_ts_txn(
txn, self._clock.time_msec() - 30 * 24 * 60 * 60 * 1000
)
logger.info(
"Found stream ordering 1 month ago: it's %d",
self.stream_ordering_month_ago
)
logger.info("Searching for stream ordering 1 day ago")
self.stream_ordering_day_ago = self._find_first_stream_ordering_after_ts_txn(
txn, self._clock.time_msec() - 24 * 60 * 60 * 1000
)
logger.info(
"Found stream ordering 1 day ago: it's %d",
self.stream_ordering_day_ago
)
def find_first_stream_ordering_after_ts(self, ts):
"""Gets the stream ordering corresponding to a given timestamp.
Specifically, finds the stream_ordering of the first event that was
received on or after the timestamp. This is done by a binary search on
the events table, since there is no index on received_ts, so is
relatively slow.
Args:
ts (int): timestamp in millis
Returns:
Deferred[int]: stream ordering of the first event received on/after
the timestamp
"""
return self.runInteraction(
"_find_first_stream_ordering_after_ts_txn",
self._find_first_stream_ordering_after_ts_txn,
ts,
)
@staticmethod
def _find_first_stream_ordering_after_ts_txn(txn, ts):
"""
Find the stream_ordering of the first event that was received on or
after a given timestamp. This is relatively slow as there is no index
on received_ts but we can then use this to delete push actions before
this.
received_ts must necessarily be in the same order as stream_ordering
and stream_ordering is indexed, so we manually binary search using
stream_ordering
Args:
txn (twisted.enterprise.adbapi.Transaction):
ts (int): timestamp to search for
Returns:
int: stream ordering
"""
txn.execute("SELECT MAX(stream_ordering) FROM events")
max_stream_ordering = txn.fetchone()[0]
if max_stream_ordering is None:
return 0
# We want the first stream_ordering in which received_ts is greater
# than or equal to ts. Call this point X.
#
# We maintain the invariants:
#
# range_start <= X <= range_end
#
range_start = 0
range_end = max_stream_ordering + 1
# Given a stream_ordering, look up the timestamp at that
# stream_ordering.
#
# The array may be sparse (we may be missing some stream_orderings).
# We treat the gaps as the same as having the same value as the
# preceding entry, because we will pick the lowest stream_ordering
# which satisfies our requirement of received_ts >= ts.
#
# For example, if our array of events indexed by stream_ordering is
# [10, <none>, 20], we should treat this as being equivalent to
# [10, 10, 20].
#
sql = (
"SELECT received_ts FROM events"
" WHERE stream_ordering <= ?"
" ORDER BY stream_ordering DESC"
" LIMIT 1"
)
while range_end - range_start > 0:
middle = (range_end + range_start) // 2
txn.execute(sql, (middle,))
row = txn.fetchone()
if row is None:
# no rows with stream_ordering<=middle
range_start = middle + 1
continue
middle_ts = row[0]
if ts > middle_ts:
# we got a timestamp lower than the one we were looking for.
# definitely need to look higher: X > middle.
range_start = middle + 1
else:
# we got a timestamp higher than (or the same as) the one we
# were looking for. We aren't yet sure about the point we
# looked up, but we can be sure that X <= middle.
range_end = middle
return range_end
class EventPushActionsStore(EventPushActionsWorkerStore):
EPA_HIGHLIGHT_INDEX = "epa_highlight_index"
def __init__(self, db_conn, hs):
super(EventPushActionsStore, self).__init__(db_conn, hs)
self.register_background_index_update(
self.EPA_HIGHLIGHT_INDEX,
index_name="event_push_actions_u_highlight",
table="event_push_actions",
columns=["user_id", "stream_ordering"],
)
self.register_background_index_update(
"event_push_actions_highlights_index",
index_name="event_push_actions_highlights_index",
table="event_push_actions",
columns=["user_id", "room_id", "topological_ordering", "stream_ordering"],
where_clause="highlight=1"
)
self._doing_notif_rotation = False
self._rotate_notif_loop = self._clock.looping_call(
self._rotate_notifs, 30 * 60 * 1000
)
def _set_push_actions_for_event_and_users_txn(self, txn, events_and_contexts,
all_events_and_contexts):
"""Handles moving push actions from staging table to main
event_push_actions table for all events in `events_and_contexts`.
Also ensures that all events in `all_events_and_contexts` are removed
from the push action staging area.
Args:
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
all_events_and_contexts (list[(EventBase, EventContext)]): all
events that we were going to persist. This includes events
we've already persisted, etc, that wouldn't appear in
events_and_context.
"""
sql = """
INSERT INTO event_push_actions (
room_id, event_id, user_id, actions, stream_ordering,
topological_ordering, notif, highlight
)
SELECT ?, event_id, user_id, actions, ?, ?, notif, highlight
FROM event_push_actions_staging
WHERE event_id = ?
"""
if events_and_contexts:
txn.executemany(sql, (
(
event.room_id, event.internal_metadata.stream_ordering,
event.depth, event.event_id,
)
for event, _ in events_and_contexts
))
for event, _ in events_and_contexts:
user_ids = self._simple_select_onecol_txn(
txn,
table="event_push_actions_staging",
keyvalues={
"event_id": event.event_id,
},
retcol="user_id",
)
for uid in user_ids:
txn.call_after(
self.get_unread_event_push_actions_by_room_for_user.invalidate_many,
(event.room_id, uid,)
)
# Now we delete the staging area for *all* events that were being
# persisted.
txn.executemany(
"DELETE FROM event_push_actions_staging WHERE event_id = ?",
(
(event.event_id,)
for event, _ in all_events_and_contexts
)
)
@defer.inlineCallbacks
def get_push_actions_for_user(self, user_id, before=None, limit=50,
only_highlight=False):
def f(txn):
before_clause = ""
if before:
before_clause = "AND epa.stream_ordering < ?"
args = [user_id, before, limit]
else:
args = [user_id, limit]
if only_highlight:
if len(before_clause) > 0:
before_clause += " "
before_clause += "AND epa.highlight = 1"
# NB. This assumes event_ids are globally unique since
# it makes the query easier to index
sql = (
"SELECT epa.event_id, epa.room_id,"
" epa.stream_ordering, epa.topological_ordering,"
" epa.actions, epa.highlight, epa.profile_tag, e.received_ts"
" FROM event_push_actions epa, events e"
" WHERE epa.event_id = e.event_id"
" AND epa.user_id = ? %s"
" ORDER BY epa.stream_ordering DESC"
" LIMIT ?"
% (before_clause,)
)
txn.execute(sql, args)
return self.cursor_to_dict(txn)
push_actions = yield self.runInteraction(
"get_push_actions_for_user", f
)
for pa in push_actions:
pa["actions"] = _deserialize_action(pa["actions"], pa["highlight"])
defer.returnValue(push_actions)
@defer.inlineCallbacks
def get_time_of_last_push_action_before(self, stream_ordering):
def f(txn):
sql = (
"SELECT e.received_ts"
" FROM event_push_actions AS ep"
" JOIN events e ON ep.room_id = e.room_id AND ep.event_id = e.event_id"
" WHERE ep.stream_ordering > ?"
" ORDER BY ep.stream_ordering ASC"
" LIMIT 1"
)
txn.execute(sql, (stream_ordering,))
return txn.fetchone()
result = yield self.runInteraction("get_time_of_last_push_action_before", f)
defer.returnValue(result[0] if result else None)
@defer.inlineCallbacks
def get_latest_push_action_stream_ordering(self):
def f(txn):
txn.execute("SELECT MAX(stream_ordering) FROM event_push_actions")
return txn.fetchone()
result = yield self.runInteraction(
"get_latest_push_action_stream_ordering", f
)
defer.returnValue(result[0] or 0)
def _remove_push_actions_for_event_id_txn(self, txn, room_id, event_id):
# Sad that we have to blow away the cache for the whole room here
txn.call_after(
self.get_unread_event_push_actions_by_room_for_user.invalidate_many,
(room_id,)
)
txn.execute(
"DELETE FROM event_push_actions WHERE room_id = ? AND event_id = ?",
(room_id, event_id)
)
def _remove_old_push_actions_before_txn(self, txn, room_id, user_id,
topological_ordering, stream_ordering):
"""
Purges old push actions for a user and room before a given
topological_ordering.
We however keep a months worth of highlighted notifications, so that
users can still get a list of recent highlights.
Args:
txn: The transcation
room_id: Room ID to delete from
user_id: user ID to delete for
topological_ordering: The lowest topological ordering which will
not be deleted.
"""
txn.call_after(
self.get_unread_event_push_actions_by_room_for_user.invalidate_many,
(room_id, user_id, )
)
# We need to join on the events table to get the received_ts for
# event_push_actions and sqlite won't let us use a join in a delete so
# we can't just delete where received_ts < x. Furthermore we can
# only identify event_push_actions by a tuple of room_id, event_id
# we we can't use a subquery.
# Instead, we look up the stream ordering for the last event in that
# room received before the threshold time and delete event_push_actions
# in the room with a stream_odering before that.
txn.execute(
"DELETE FROM event_push_actions "
" WHERE user_id = ? AND room_id = ? AND "
" topological_ordering <= ?"
" AND ((stream_ordering < ? AND highlight = 1) or highlight = 0)",
(user_id, room_id, topological_ordering, self.stream_ordering_month_ago)
)
txn.execute("""
DELETE FROM event_push_summary
WHERE room_id = ? AND user_id = ? AND stream_ordering <= ?
""", (room_id, user_id, stream_ordering))
@defer.inlineCallbacks
def _rotate_notifs(self):
if self._doing_notif_rotation or self.stream_ordering_day_ago is None:
return
self._doing_notif_rotation = True
try:
while True:
logger.info("Rotating notifications")
caught_up = yield self.runInteraction(
"_rotate_notifs",
self._rotate_notifs_txn
)
if caught_up:
break
yield sleep(5)
finally:
self._doing_notif_rotation = False
def _rotate_notifs_txn(self, txn):
"""Archives older notifications into event_push_summary. Returns whether
the archiving process has caught up or not.
"""
old_rotate_stream_ordering = self._simple_select_one_onecol_txn(
txn,
table="event_push_summary_stream_ordering",
keyvalues={},
retcol="stream_ordering",
)
# We don't to try and rotate millions of rows at once, so we cap the
# maximum stream ordering we'll rotate before.
txn.execute("""
SELECT stream_ordering FROM event_push_actions
WHERE stream_ordering > ?
ORDER BY stream_ordering ASC LIMIT 1 OFFSET 50000
""", (old_rotate_stream_ordering,))
stream_row = txn.fetchone()
if stream_row:
offset_stream_ordering, = stream_row
rotate_to_stream_ordering = min(
self.stream_ordering_day_ago, offset_stream_ordering
)
caught_up = offset_stream_ordering >= self.stream_ordering_day_ago
else:
rotate_to_stream_ordering = self.stream_ordering_day_ago
caught_up = True
logger.info("Rotating notifications up to: %s", rotate_to_stream_ordering)
self._rotate_notifs_before_txn(txn, rotate_to_stream_ordering)
# We have caught up iff we were limited by `stream_ordering_day_ago`
return caught_up
def _rotate_notifs_before_txn(self, txn, rotate_to_stream_ordering):
old_rotate_stream_ordering = self._simple_select_one_onecol_txn(
txn,
table="event_push_summary_stream_ordering",
keyvalues={},
retcol="stream_ordering",
)
# Calculate the new counts that should be upserted into event_push_summary
sql = """
SELECT user_id, room_id,
coalesce(old.notif_count, 0) + upd.notif_count,
upd.stream_ordering,
old.user_id
FROM (
SELECT user_id, room_id, count(*) as notif_count,
max(stream_ordering) as stream_ordering
FROM event_push_actions
WHERE ? <= stream_ordering AND stream_ordering < ?
AND highlight = 0
GROUP BY user_id, room_id
) AS upd
LEFT JOIN event_push_summary AS old USING (user_id, room_id)
"""
txn.execute(sql, (old_rotate_stream_ordering, rotate_to_stream_ordering,))
rows = txn.fetchall()
logger.info("Rotating notifications, handling %d rows", len(rows))
# If the `old.user_id` above is NULL then we know there isn't already an
# entry in the table, so we simply insert it. Otherwise we update the
# existing table.
self._simple_insert_many_txn(
txn,
table="event_push_summary",
values=[
{
"user_id": row[0],
"room_id": row[1],
"notif_count": row[2],
"stream_ordering": row[3],
}
for row in rows if row[4] is None
]
)
txn.executemany(
"""
UPDATE event_push_summary SET notif_count = ?, stream_ordering = ?
WHERE user_id = ? AND room_id = ?
""",
((row[2], row[3], row[0], row[1],) for row in rows if row[4] is not None)
)
txn.execute(
"DELETE FROM event_push_actions"
" WHERE ? <= stream_ordering AND stream_ordering < ? AND highlight = 0",
(old_rotate_stream_ordering, rotate_to_stream_ordering,)
)
logger.info("Rotating notifications, deleted %s push actions", txn.rowcount)
txn.execute(
"UPDATE event_push_summary_stream_ordering SET stream_ordering = ?",
(rotate_to_stream_ordering,)
)
def _action_has_highlight(actions):
for action in actions:
try:
if action.get("set_tweak", None) == "highlight":
return action.get("value", True)
except AttributeError:
pass
return False
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