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Remove roominfo cache (#2615)

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* Remove roominfo cache

It's the source of a number of race conditions which are seemingly causing bugs and CI failures.

* Make the linter less sad
This commit is contained in:
Neil Alexander 2022-08-03 17:14:21 +01:00 • committed by GitHub
parent bbff41b44b
commit 2250768be1
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 9 additions and 68 deletions
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35
roomserver/storage/shared/storage.go
View file

@ -156,30 +156,15 @@ func (d *Database) RoomInfo(ctx context.Context, roomID string) (*types.RoomInfo
}
func (d *Database) roomInfo(ctx context.Context, txn *sql.Tx, roomID string) (*types.RoomInfo, error) {
roomInfo, ok := d.Cache.GetRoomInfo(roomID)
if ok && roomInfo != nil && !roomInfo.IsStub() {
// The data that's in the cache is not stubby, so return it.
return roomInfo, nil
}
// At this point we either don't have an entry in the cache, or
// it is stubby, so let's check the roomserver_rooms table again.
roomInfoFromDB, err := d.RoomsTable.SelectRoomInfo(ctx, txn, roomID)
roomInfo, err := d.RoomsTable.SelectRoomInfo(ctx, txn, roomID)
if err != nil {
return nil, err
}
// If we have a stubby cache entry already, update it and return
// the reference to the cache entry.
if roomInfo != nil {
roomInfo.CopyFrom(roomInfoFromDB)
return roomInfo, nil
d.Cache.StoreRoomServerRoomID(roomInfo.RoomNID, roomID)
d.Cache.StoreRoomVersion(roomID, roomInfo.RoomVersion)
}
// Otherwise, try to admit the data into the cache and return the
// new reference from the database.
if roomInfoFromDB != nil {
d.Cache.StoreRoomServerRoomID(roomInfoFromDB.RoomNID, roomID)
d.Cache.StoreRoomInfo(roomID, roomInfoFromDB)
}
return roomInfoFromDB, err
return roomInfo, err
}
func (d *Database) AddState(
@ -504,8 +489,8 @@ func (d *Database) events(
fetchNIDList := make([]types.RoomNID, 0, len(uniqueRoomNIDs))
for n := range uniqueRoomNIDs {
if roomID, ok := d.Cache.GetRoomServerRoomID(n); ok {
if roomInfo, ok := d.Cache.GetRoomInfo(roomID); ok {
roomVersions[n] = roomInfo.RoomVersion
if roomVersion, ok := d.Cache.GetRoomVersion(roomID); ok {
roomVersions[n] = roomVersion
continue
}
}
@ -762,9 +747,6 @@ func (d *Database) MissingAuthPrevEvents(
func (d *Database) assignRoomNID(
ctx context.Context, roomID string, roomVersion gomatrixserverlib.RoomVersion,
) (types.RoomNID, error) {
if roomInfo, ok := d.Cache.GetRoomInfo(roomID); ok {
return roomInfo.RoomNID, nil
}
// Check if we already have a numeric ID in the database.
roomNID, err := d.RoomsTable.SelectRoomNID(ctx, nil, roomID)
if err == sql.ErrNoRows {
@ -837,8 +819,9 @@ func extractRoomVersionFromCreateEvent(event *gomatrixserverlib.Event) (
// "servers should not apply or send redactions to clients until both the redaction event and original event have been seen, and are valid."
// https://matrix.org/docs/spec/rooms/v3#authorization-rules-for-events
// These cases are:
// - This is a redaction event, redact the event it references if we know about it.
// - This is a normal event which may have been previously redacted.
// - This is a redaction event, redact the event it references if we know about it.
// - This is a normal event which may have been previously redacted.
//
// In the first case, check if we have the referenced event then apply the redaction, else store it
// in the redactions table with validated=FALSE. In the second case, check if there is a redaction for it:
// if there is then apply the redactions and set validated=TRUE.