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Resolve and share `state_groups` for all historical events in batch (MSC2716) (#10975) 

Resolve and share `state_groups` for all historical events in batch.  This also helps for showing the appropriate avatar/displayname in Element and will work whenever `/messages` has one of the historical messages as the first message in the batch.

This does have the flaw where if you just insert a single historical event somewhere, it probably won't resolve the state correctly from `/messages` or `/context` since it will grab a non historical event above or below with resolved state which never included the historical state back then. For the same reasions, this also does not work in Element between the transition from actual messages to historical messages. In the Gitter case, this isn't really a problem since all of the historical messages are in one big lump at the beginning of the room.

For a future iteration, might be good to look at `/messages` and `/context` to additionally add the `state` for any historical messages in that batch.

---

How are the `state_groups` shared? To illustrate the `state_group` sharing, see this example:


**Before** (new `state_group` for every event 😬, very inefficient):
```
# Tests from https://github.com/matrix-org/complement/pull/206
$ COMPLEMENT_ALWAYS_PRINT_SERVER_LOGS=1 COMPLEMENT_DIR=../complement ./scripts-dev/complement.sh TestBackfillingHistory/parallel/should_resolve_member_state_events_for_historical_events
create_new_client_event m.room.member event=$_JXfwUDIWS6xKGG4SmZXjSFrizhARM7QblhATVWWUcA state_group=None
create_new_client_event org.matrix.msc2716.insertion event=$1ZBfmBKEjg94d-vGYymKrVYeghwBOuGJ3wubU1-I9y0 state_group=9
create_new_client_event org.matrix.msc2716.insertion event=$Mq2JvRetTyclPuozRI682SAjYp3GqRuPc8_cH5-ezPY state_group=10
create_new_client_event m.room.message event=$MfmY4rBQkxrIp8jVwVMTJ4PKnxSigpG9E2cn7S0AtTo state_group=11
create_new_client_event m.room.message event=$uYOv6V8wiF7xHwOMt-60d1AoOIbqLgrDLz6ZIQDdWUI state_group=12
create_new_client_event m.room.message event=$PAbkJRMxb0bX4A6av463faiAhxkE3FEObM1xB4D0UG4 state_group=13
create_new_client_event org.matrix.msc2716.batch event=$Oy_S7AWN7rJQe_MYwGPEy6RtbYklrI-tAhmfiLrCaKI state_group=14
```

**After** (all events in batch sharing `state_group=10`) (the base insertion event has `state_group=8` which matches the `prev_event` we're inserting next to):

```
# Tests from https://github.com/matrix-org/complement/pull/206
$ COMPLEMENT_ALWAYS_PRINT_SERVER_LOGS=1 COMPLEMENT_DIR=../complement ./scripts-dev/complement.sh TestBackfillingHistory/parallel/should_resolve_member_state_events_for_historical_events
create_new_client_event m.room.member event=$PWomJ8PwENYEYuVNoG30gqtybuQQSZ55eldBUSs0i0U state_group=None
create_new_client_event org.matrix.msc2716.insertion event=$e_mCU7Eah9ABF6nQU7lu4E1RxIWccNF05AKaTT5m3lw state_group=9
create_new_client_event org.matrix.msc2716.insertion event=$ui7A3_GdXIcJq0C8GpyrF8X7B3DTjMd_WGCjogax7xU state_group=10
create_new_client_event m.room.message event=$EnTIM5rEGVezQJiYl62uFBl6kJ7B-sMxWqe2D_4FX1I state_group=10
create_new_client_event m.room.message event=$LGx5jGONnBPuNhAuZqHeEoXChd9ryVkuTZatGisOPjk state_group=10
create_new_client_event m.room.message event=$wW0zwoN50lbLu1KoKbybVMxLbKUj7GV_olozIc5i3M0 state_group=10
create_new_client_event org.matrix.msc2716.batch event=$5ZB6dtzqFBCEuMRgpkU201Qhx3WtXZGTz_YgldL6JrQ state_group=10
```
This commit is contained in:
Eric Eastwood 2021-10-13 17:44:00 -05:00 committed by GitHub
parent 404444260a
commit 35d6b914eb
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8 changed files with 114 additions and 47 deletions
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1
changelog.d/10975.feature Normal file
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@ -0,0 +1 @@
Resolve and share `state_groups` for all [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) historical events in batch.

57
synapse/handlers/message.py
View File

@ -607,29 +607,6 @@ class EventCreationHandler:
builder.internal_metadata.historical = historical
# Strip down the auth_event_ids to only what we need to auth the event.
# For example, we don't need extra m.room.member that don't match event.sender
if auth_event_ids is not None:
# If auth events are provided, prev events must be also.
assert prev_event_ids is not None
temp_event = await builder.build(
prev_event_ids=prev_event_ids,
auth_event_ids=auth_event_ids,
depth=depth,
)
auth_events = await self.store.get_events_as_list(auth_event_ids)
# Create a StateMap[str]
auth_event_state_map = {
(e.type, e.state_key): e.event_id for e in auth_events
}
# Actually strip down and use the necessary auth events
auth_event_ids = self._event_auth_handler.compute_auth_events(
event=temp_event,
current_state_ids=auth_event_state_map,
for_verification=False,
)
event, context = await self.create_new_client_event(
builder=builder,
requester=requester,
@ -936,6 +913,33 @@ class EventCreationHandler:
Tuple of created event, context
"""
# Strip down the auth_event_ids to only what we need to auth the event.
# For example, we don't need extra m.room.member that don't match event.sender
full_state_ids_at_event = None
if auth_event_ids is not None:
# If auth events are provided, prev events must be also.
assert prev_event_ids is not None
# Copy the full auth state before it stripped down
full_state_ids_at_event = auth_event_ids.copy()
temp_event = await builder.build(
prev_event_ids=prev_event_ids,
auth_event_ids=auth_event_ids,
depth=depth,
)
auth_events = await self.store.get_events_as_list(auth_event_ids)
# Create a StateMap[str]
auth_event_state_map = {
(e.type, e.state_key): e.event_id for e in auth_events
}
# Actually strip down and use the necessary auth events
auth_event_ids = self._event_auth_handler.compute_auth_events(
event=temp_event,
current_state_ids=auth_event_state_map,
for_verification=False,
)
if prev_event_ids is not None:
assert (
len(prev_event_ids) <= 10
@ -965,6 +969,13 @@ class EventCreationHandler:
if builder.internal_metadata.outlier:
event.internal_metadata.outlier = True
context = EventContext.for_outlier()
elif (
event.type == EventTypes.MSC2716_INSERTION
and full_state_ids_at_event
and builder.internal_metadata.is_historical()
):
old_state = await self.store.get_events_as_list(full_state_ids_at_event)
context = await self.state.compute_event_context(event, old_state=old_state)
else:
context = await self.state.compute_event_context(event)

40
synapse/handlers/room_batch.py
View File

@ -13,6 +13,10 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
def generate_fake_event_id() -> str:
return "$fake_" + random_string(43)
class RoomBatchHandler:
def __init__(self, hs: "HomeServer"):
self.hs = hs
@ -177,6 +181,11 @@ class RoomBatchHandler:
state_event_ids_at_start = []
auth_event_ids = initial_auth_event_ids.copy()
# Make the state events float off on their own so we don't have a
# bunch of `@mxid joined the room` noise between each batch
prev_event_id_for_state_chain = generate_fake_event_id()
for state_event in state_events_at_start:
assert_params_in_dict(
state_event, ["type", "origin_server_ts", "content", "sender"]
@ -200,10 +209,6 @@ class RoomBatchHandler:
# Mark all events as historical
event_dict["content"][EventContentFields.MSC2716_HISTORICAL] = True
# Make the state events float off on their own so we don't have a
# bunch of `@mxid joined the room` noise between each batch
fake_prev_event_id = "$" + random_string(43)
# TODO: This is pretty much the same as some other code to handle inserting state in this file
if event_dict["type"] == EventTypes.Member:
membership = event_dict["content"].get("membership", None)
@ -216,7 +221,7 @@ class RoomBatchHandler:
action=membership,
content=event_dict["content"],
outlier=True,
prev_event_ids=[fake_prev_event_id],
prev_event_ids=[prev_event_id_for_state_chain],
# Make sure to use a copy of this list because we modify it
# later in the loop here. Otherwise it will be the same
# reference and also update in the event when we append later.
@ -235,7 +240,7 @@ class RoomBatchHandler:
),
event_dict,
outlier=True,
prev_event_ids=[fake_prev_event_id],
prev_event_ids=[prev_event_id_for_state_chain],
# Make sure to use a copy of this list because we modify it
# later in the loop here. Otherwise it will be the same
# reference and also update in the event when we append later.
@ -245,6 +250,8 @@ class RoomBatchHandler:
state_event_ids_at_start.append(event_id)
auth_event_ids.append(event_id)
# Connect all the state in a floating chain
prev_event_id_for_state_chain = event_id
return state_event_ids_at_start
@ -289,6 +296,10 @@ class RoomBatchHandler:
for ev in events_to_create:
assert_params_in_dict(ev, ["type", "origin_server_ts", "content", "sender"])
assert self.hs.is_mine_id(ev["sender"]), "User must be our own: %s" % (
ev["sender"],
)
event_dict = {
"type": ev["type"],
"origin_server_ts": ev["origin_server_ts"],
@ -311,6 +322,19 @@ class RoomBatchHandler:
historical=True,
depth=inherited_depth,
)
assert context._state_group
# Normally this is done when persisting the event but we have to
# pre-emptively do it here because we create all the events first,
# then persist them in another pass below. And we want to share
# state_groups across the whole batch so this lookup needs to work
# for the next event in the batch in this loop.
await self.store.store_state_group_id_for_event_id(
event_id=event.event_id,
state_group_id=context._state_group,
)
logger.debug(
"RoomBatchSendEventRestServlet inserting event=%s, prev_event_ids=%s, auth_event_ids=%s",
event,
@ -318,10 +342,6 @@ class RoomBatchHandler:
auth_event_ids,
)
assert self.hs.is_mine_id(event.sender), "User must be our own: %s" % (
event.sender,
)
events_to_persist.append((event, context))
event_id = event.event_id

15
synapse/rest/client/room_batch.py
View File

@ -32,7 +32,6 @@ from synapse.http.servlet import (
from synapse.http.site import SynapseRequest
from synapse.rest.client.transactions import HttpTransactionCache
from synapse.types import JsonDict
from synapse.util.stringutils import random_string
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -160,11 +159,6 @@ class RoomBatchSendEventRestServlet(RestServlet):
base_insertion_event = None
if batch_id_from_query:
batch_id_to_connect_to = batch_id_from_query
# All but the first base insertion event should point at a fake
# event, which causes the HS to ask for the state at the start of
# the batch later.
fake_prev_event_id = "$" + random_string(43)
prev_event_ids = [fake_prev_event_id]
# Otherwise, create an insertion event to act as a starting point.
#
# We don't always have an insertion event to start hanging more history
@ -173,8 +167,6 @@ class RoomBatchSendEventRestServlet(RestServlet):
# an insertion event), in which case we just create a new insertion event
# that can then get pointed to by a "marker" event later.
else:
prev_event_ids = prev_event_ids_from_query
base_insertion_event_dict = (
self.room_batch_handler.create_insertion_event_dict(
sender=requester.user.to_string(),
@ -182,7 +174,7 @@ class RoomBatchSendEventRestServlet(RestServlet):
origin_server_ts=last_event_in_batch["origin_server_ts"],
)
)
base_insertion_event_dict["prev_events"] = prev_event_ids.copy()
base_insertion_event_dict["prev_events"] = prev_event_ids_from_query.copy()
(
base_insertion_event,
@ -203,6 +195,11 @@ class RoomBatchSendEventRestServlet(RestServlet):
EventContentFields.MSC2716_NEXT_BATCH_ID
]
# Also connect the historical event chain to the end of the floating
# state chain, which causes the HS to ask for the state at the start of
# the batch later.
prev_event_ids = [state_event_ids_at_start[-1]]
# Create and persist all of the historical events as well as insertion
# and batch meta events to make the batch navigable in the DAG.
event_ids, next_batch_id = await self.room_batch_handler.handle_batch_of_events(

10
synapse/storage/databases/main/events.py
View File

@ -2069,12 +2069,14 @@ class PersistEventsStore:
state_groups[event.event_id] = context.state_group
self.db_pool.simple_insert_many_txn(
self.db_pool.simple_upsert_many_txn(
txn,
table="event_to_state_groups",
values=[
{"state_group": state_group_id, "event_id": event_id}
for event_id, state_group_id in state_groups.items()
key_names=["event_id"],
key_values=[[event_id] for event_id, _ in state_groups.items()],
value_names=["state_group"],
value_values=[
[state_group_id] for _, state_group_id in state_groups.items()
],
)

13
synapse/storage/databases/main/room_batch.py
View File

@ -36,3 +36,16 @@ class RoomBatchStore(SQLBaseStore):
retcol="event_id",
allow_none=True,
)
async def store_state_group_id_for_event_id(
self, event_id: str, state_group_id: int
) -> Optional[str]:
{
await self.db_pool.simple_upsert(
table="event_to_state_groups",
keyvalues={"event_id": event_id},
values={"state_group": state_group_id, "event_id": event_id},
# Unique constraint on event_id so we don't have to lock
lock=False,
)
}

6
synapse/storage/schema/__init__.py
View File

@ -12,7 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
SCHEMA_VERSION = 64 # remember to update the list below when updating
SCHEMA_VERSION = 65 # remember to update the list below when updating
"""Represents the expectations made by the codebase about the database schema
This should be incremented whenever the codebase changes its requirements on the
@ -41,6 +41,10 @@ Changes in SCHEMA_VERSION = 63:
Changes in SCHEMA_VERSION = 64:
- MSC2716: Rename related tables and columns from "chunks" to "batches".
Changes in SCHEMA_VERSION = 65:
- MSC2716: Remove unique event_id constraint from insertion_event_edges
because an insertion event can have multiple edges.
"""

19
synapse/storage/schema/main/delta/65/01msc2716_insertion_event_edges.sql Normal file
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@ -0,0 +1,19 @@
/* Copyright 2021 The Matrix.org Foundation C.I.C
*
* 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.
*/
-- Recreate the insertion_event_edges event_id index without the unique constraint
-- because an insertion event can have multiple edges.
DROP INDEX insertion_event_edges_event_id;
CREATE INDEX IF NOT EXISTS insertion_event_edges_event_id ON insertion_event_edges(event_id);