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Refactoring and cleanups

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A few non-functional changes:

* A bunch of docstrings to document types
* Split `EventsStore._persist_events_txn` up a bit. Hopefully it's a bit more
  readable.
* Rephrase `EventFederationStore._update_min_depth_for_room_txn` to avoid
  mind-bending conditional.
* Rephrase rejected/outlier conditional in `_update_outliers_txn` to avoid
  mind-bending conditional.
This commit is contained in:
Richard van der Hoff 2017-03-17 11:51:13 +00:00
parent 2abe85d50e
commit 5068fb16a5
5 changed files with 265 additions and 81 deletions
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26
synapse/events/snapshot.py
View file

@ -15,6 +15,32 @@
class EventContext(object):
"""
Attributes:
current_state_ids (dict[(str, str), str]):
The current state map including the current event.
(type, state_key) -> event_id
prev_state_ids (dict[(str, str), str]):
The current state map excluding the current event.
(type, state_key) -> event_id
state_group (int): state group id
rejected (bool|str): A rejection reason if the event was rejected, else
False
push_actions (list[(str, list[object])]): list of (user_id, actions)
tuples
prev_group (int): Previously persisted state group. ``None`` for an
outlier.
delta_ids (dict[(str, str), str]): Delta from ``prev_group``.
(type, state_key) -> event_id. ``None`` for an outlier.
prev_state_events (?): XXX: is this ever set to anything other than
the empty list?
"""
__slots__ = [
"current_state_ids",
"prev_state_ids",

10
synapse/handlers/federation.py
View file

@ -1537,7 +1537,17 @@ class FederationHandler(BaseHandler):
@defer.inlineCallbacks
def _prep_event(self, origin, event, state=None, auth_events=None):
"""
Args:
origin:
event:
state:
auth_events:
Returns:
Deferred, which resolves to synapse.events.snapshot.EventContext
"""
context = yield self.state_handler.compute_event_context(
event, old_state=state,
)

11
synapse/state.py
View file

@ -177,17 +177,12 @@ class StateHandler(object):
@defer.inlineCallbacks
def compute_event_context(self, event, old_state=None):
""" Fills out the context with the `current state` of the graph. The
`current state` here is defined to be the state of the event graph
just before the event - i.e. it never includes `event`
If `event` has `auth_events` then this will also fill out the
`auth_events` field on `context` from the `current_state`.
"""Build an EventContext structure for the event.
Args:
event (EventBase)
event (synapse.events.EventBase):
Returns:
an EventContext
synapse.events.snapshot.EventContext:
"""
context = EventContext()

24
synapse/storage/event_federation.py
View file

@ -201,19 +201,19 @@ class EventFederationStore(SQLBaseStore):
def _update_min_depth_for_room_txn(self, txn, room_id, depth):
min_depth = self._get_min_depth_interaction(txn, room_id)
do_insert = depth < min_depth if min_depth else True
if min_depth and depth >= min_depth:
return
if do_insert:
self._simple_upsert_txn(
txn,
table="room_depth",
keyvalues={
"room_id": room_id,
},
values={
"min_depth": depth,
},
)
self._simple_upsert_txn(
txn,
table="room_depth",
keyvalues={
"room_id": room_id,
},
values={
"min_depth": depth,
},
)
def _handle_mult_prev_events(self, txn, events):
"""

275
synapse/storage/events.py
View file

@ -34,14 +34,16 @@ from canonicaljson import encode_canonical_json
from collections import deque, namedtuple, OrderedDict
from functools import wraps
import synapse
import synapse.metrics
import logging
import math
import ujson as json
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
from synapse.events.snapshot import EventContext # noqa: F401
logger = logging.getLogger(__name__)
@ -82,6 +84,11 @@ class _EventPeristenceQueue(object):
def add_to_queue(self, room_id, events_and_contexts, backfilled):
"""Add events to the queue, with the given persist_event options.
Args:
room_id (str):
events_and_contexts (list[(EventBase, EventContext)]):
backfilled (bool):
"""
queue = self._event_persist_queues.setdefault(room_id, deque())
if queue:
@ -227,6 +234,17 @@ class EventsStore(SQLBaseStore):
@defer.inlineCallbacks
@log_function
def persist_event(self, event, context, backfilled=False):
"""
Args:
event (EventBase):
context (EventContext):
backfilled (bool):
Returns:
Deferred: resolves to (int, int): the stream ordering of ``event``,
and the stream ordering of the latest persisted event
"""
deferred = self._event_persist_queue.add_to_queue(
event.room_id, [(event, context)],
backfilled=backfilled,
@ -253,6 +271,16 @@ class EventsStore(SQLBaseStore):
@defer.inlineCallbacks
def _persist_events(self, events_and_contexts, backfilled=False,
delete_existing=False):
"""Persist events to db
Args:
events_and_contexts (list[(EventBase, EventContext)]):
backfilled (bool):
delete_existing (bool):
Returns:
Deferred: resolves when the events have been persisted
"""
if not events_and_contexts:
return
@ -554,11 +582,87 @@ class EventsStore(SQLBaseStore):
and the rejections table. Things reading from those table will need to check
whether the event was rejected.
If delete_existing is True then existing events will be purged from the
database before insertion. This is useful when retrying due to IntegrityError.
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]):
events to persist
backfilled (bool): True if the events were backfilled
delete_existing (bool): True to purge existing table rows for the
events from the database. This is useful when retrying due to
IntegrityError.
current_state_for_room (dict[str, (list[str], list[str])]):
The current-state delta for each room. For each room, a tuple
(to_delete, to_insert), being a list of event ids to be removed
from the current state, and a list of event ids to be added to
the current state.
new_forward_extremeties (dict[str, list[str]]):
The new forward extremities for each room. For each room, a
list of the event ids which are the forward extremities.
"""
self._update_current_state_txn(txn, current_state_for_room)
max_stream_order = events_and_contexts[-1][0].internal_metadata.stream_ordering
for room_id, current_state_tuple in current_state_for_room.iteritems():
self._update_forward_extremities_txn(
txn,
new_forward_extremities=new_forward_extremeties,
max_stream_order=max_stream_order,
)
# Ensure that we don't have the same event twice.
events_and_contexts = self._filter_events_and_contexts_for_duplicates(
events_and_contexts,
)
self._update_room_depths_txn(
txn,
events_and_contexts=events_and_contexts,
backfilled=backfilled,
)
# _update_outliers_txn filters out any events which have already been
# persisted, and returns the filtered list.
events_and_contexts = self._update_outliers_txn(
txn,
events_and_contexts=events_and_contexts,
)
# From this point onwards the events are only events that we haven't
# seen before.
if delete_existing:
# For paranoia reasons, we go and delete all the existing entries
# for these events so we can reinsert them.
# This gets around any problems with some tables already having
# entries.
self._delete_existing_rows_txn(
txn,
events_and_contexts=events_and_contexts,
)
self._store_event_txn(
txn,
events_and_contexts=events_and_contexts,
)
# _store_rejected_events_txn filters out any events which were
# rejected, and returns the filtered list.
events_and_contexts = self._store_rejected_events_txn(
txn,
events_and_contexts=events_and_contexts,
)
# From this point onwards the events are only ones that weren't
# rejected.
self._update_metadata_tables_txn(
txn,
events_and_contexts=events_and_contexts,
backfilled=backfilled,
)
def _update_current_state_txn(self, txn, state_delta_by_room):
for room_id, current_state_tuple in state_delta_by_room.iteritems():
to_delete, to_insert = current_state_tuple
txn.executemany(
"DELETE FROM current_state_events WHERE event_id = ?",
@ -608,7 +712,9 @@ class EventsStore(SQLBaseStore):
txn, self.get_current_state_ids, (room_id,)
)
for room_id, new_extrem in new_forward_extremeties.items():
def _update_forward_extremities_txn(self, txn, new_forward_extremities,
max_stream_order):
for room_id, new_extrem in new_forward_extremities.items():
self._simple_delete_txn(
txn,
table="event_forward_extremities",
@ -626,7 +732,7 @@ class EventsStore(SQLBaseStore):
"event_id": ev_id,
"room_id": room_id,
}
for room_id, new_extrem in new_forward_extremeties.items()
for room_id, new_extrem in new_forward_extremities.items()
for ev_id in new_extrem
],
)
@ -643,13 +749,22 @@ class EventsStore(SQLBaseStore):
"event_id": event_id,
"stream_ordering": max_stream_order,
}
for room_id, new_extrem in new_forward_extremeties.items()
for room_id, new_extrem in new_forward_extremities.items()
for event_id in new_extrem
]
)
# Ensure that we don't have the same event twice.
# Pick the earliest non-outlier if there is one, else the earliest one.
@classmethod
def _filter_events_and_contexts_for_duplicates(cls, events_and_contexts):
"""Ensure that we don't have the same event twice.
Pick the earliest non-outlier if there is one, else the earliest one.
Args:
events_and_contexts (list[(EventBase, EventContext)]):
Returns:
list[(EventBase, EventContext)]: filtered list
"""
new_events_and_contexts = OrderedDict()
for event, context in events_and_contexts:
prev_event_context = new_events_and_contexts.get(event.event_id)
@ -662,9 +777,17 @@ class EventsStore(SQLBaseStore):
new_events_and_contexts[event.event_id] = (event, context)
else:
new_events_and_contexts[event.event_id] = (event, context)
return new_events_and_contexts.values()
events_and_contexts = new_events_and_contexts.values()
def _update_room_depths_txn(self, txn, events_and_contexts, backfilled):
"""Update min_depth for each room
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
backfilled (bool): True if the events were backfilled
"""
depth_updates = {}
for event, context in events_and_contexts:
# Remove the any existing cache entries for the event_ids
@ -683,6 +806,21 @@ class EventsStore(SQLBaseStore):
for room_id, depth in depth_updates.items():
self._update_min_depth_for_room_txn(txn, room_id, depth)
def _update_outliers_txn(self, txn, events_and_contexts):
"""Update any outliers with new event info.
This turns outliers into ex-outliers (unless the new event was
rejected).
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
Returns:
list[(EventBase, EventContext)] new list, without events which
are already in the events table.
"""
txn.execute(
"SELECT event_id, outlier FROM events WHERE event_id in (%s)" % (
",".join(["?"] * len(events_and_contexts)),
@ -697,19 +835,16 @@ class EventsStore(SQLBaseStore):
to_remove = set()
for event, context in events_and_contexts:
if context.rejected:
# If the event is rejected then we don't care if the event
# was an outlier or not.
if event.event_id in have_persisted:
# If we have already seen the event then ignore it.
to_remove.add(event)
continue
if event.event_id not in have_persisted:
continue
to_remove.add(event)
if context.rejected:
# If the event is rejected then we don't care if the event
# was an outlier or not.
continue
outlier_persisted = have_persisted[event.event_id]
if not event.internal_metadata.is_outlier() and outlier_persisted:
# We received a copy of an event that we had already stored as
@ -764,37 +899,19 @@ class EventsStore(SQLBaseStore):
# event isn't an outlier any more.
self._update_backward_extremeties(txn, [event])
events_and_contexts = [
return [
ec for ec in events_and_contexts if ec[0] not in to_remove
]
@classmethod
def _delete_existing_rows_txn(cls, txn, events_and_contexts):
if not events_and_contexts:
# Make sure we don't pass an empty list to functions that expect to
# be storing at least one element.
# nothing to do here
return
# From this point onwards the events are only events that we haven't
# seen before.
logger.info("Deleting existing")
def event_dict(event):
return {
k: v
for k, v in event.get_dict().items()
if k not in [
"redacted",
"redacted_because",
]
}
if delete_existing:
# For paranoia reasons, we go and delete all the existing entries
# for these events so we can reinsert them.
# This gets around any problems with some tables already having
# entries.
logger.info("Deleting existing")
for table in (
for table in (
"events",
"event_auth",
"event_json",
@ -817,11 +934,34 @@ class EventsStore(SQLBaseStore):
"redactions",
"room_memberships",
"topics"
):
txn.executemany(
"DELETE FROM %s WHERE event_id = ?" % (table,),
[(ev.event_id,) for ev, _ in events_and_contexts]
)
):
txn.executemany(
"DELETE FROM %s WHERE event_id = ?" % (table,),
[(ev.event_id,) for ev, _ in events_and_contexts]
)
def _store_event_txn(self, txn, events_and_contexts):
"""Insert new events into the event and event_json tables
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
"""
if not events_and_contexts:
# nothing to do here
return
def event_dict(event):
return {
k: v
for k, v in event.get_dict().items()
if k not in [
"redacted",
"redacted_because",
]
}
self._simple_insert_many_txn(
txn,
@ -865,6 +1005,19 @@ class EventsStore(SQLBaseStore):
],
)
def _store_rejected_events_txn(self, txn, events_and_contexts):
"""Add rows to the 'rejections' table for received events which were
rejected
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
Returns:
list[(EventBase, EventContext)] new list, without the rejected
events.
"""
# Remove the rejected events from the list now that we've added them
# to the events table and the events_json table.
to_remove = set()
@ -876,16 +1029,23 @@ class EventsStore(SQLBaseStore):
)
to_remove.add(event)
events_and_contexts = [
return [
ec for ec in events_and_contexts if ec[0] not in to_remove
]
if not events_and_contexts:
# Make sure we don't pass an empty list to functions that expect to
# be storing at least one element.
return
def _update_metadata_tables_txn(self, txn, events_and_contexts, backfilled):
"""Update all the miscellaneous tables for new events
# From this point onwards the events are only ones that weren't rejected.
Args:
txn (twisted.enterprise.adbapi.Connection): db connection
events_and_contexts (list[(EventBase, EventContext)]): events
we are persisting
backfilled (bool): True if the events were backfilled
"""
if not events_and_contexts:
# nothing to do here
return
for event, context in events_and_contexts:
# Insert all the push actions into the event_push_actions table.
@ -1005,13 +1165,6 @@ class EventsStore(SQLBaseStore):
# Prefill the event cache
self._add_to_cache(txn, events_and_contexts)
if backfilled:
# Backfilled events come before the current state so we don't need
# to update the current state table
return
return
def _add_to_cache(self, txn, events_and_contexts):
to_prefill = []