dendrite/roomserver/storage/shared/latest_events_updater.go
Neil Alexander b891c00b09
Add RoomInfo cache, remove RoomServerRoomNIDsCache (#1646)
* Add RoomInfo cache, remove RoomServerRoomNID cache, ensure caches are thread-safe

* Don't panic if the roomInfo isn't known yet

* LRU package is already threadsafe

* Use RoomInfo cache to find room version if possible in Events()

* Adding comments about RoomInfoCache safety
2020-12-16 12:15:12 +00:00

134 lines
4.5 KiB
Go

package shared
import (
"context"
"database/sql"
"fmt"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
)
type LatestEventsUpdater struct {
transaction
d *Database
roomInfo types.RoomInfo
latestEvents []types.StateAtEventAndReference
lastEventIDSent string
currentStateSnapshotNID types.StateSnapshotNID
}
func rollback(txn *sql.Tx) {
if txn == nil {
return
}
txn.Rollback() // nolint: errcheck
}
func NewLatestEventsUpdater(ctx context.Context, d *Database, txn *sql.Tx, roomInfo types.RoomInfo) (*LatestEventsUpdater, error) {
eventNIDs, lastEventNIDSent, currentStateSnapshotNID, err :=
d.RoomsTable.SelectLatestEventsNIDsForUpdate(ctx, txn, roomInfo.RoomNID)
if err != nil {
rollback(txn)
return nil, err
}
stateAndRefs, err := d.EventsTable.BulkSelectStateAtEventAndReference(ctx, txn, eventNIDs)
if err != nil {
rollback(txn)
return nil, err
}
var lastEventIDSent string
if lastEventNIDSent != 0 {
lastEventIDSent, err = d.EventsTable.SelectEventID(ctx, txn, lastEventNIDSent)
if err != nil {
rollback(txn)
return nil, err
}
}
return &LatestEventsUpdater{
transaction{ctx, txn}, d, roomInfo, stateAndRefs, lastEventIDSent, currentStateSnapshotNID,
}, nil
}
// RoomVersion implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) RoomVersion() (version gomatrixserverlib.RoomVersion) {
return u.roomInfo.RoomVersion
}
// LatestEvents implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) LatestEvents() []types.StateAtEventAndReference {
return u.latestEvents
}
// LastEventIDSent implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) LastEventIDSent() string {
return u.lastEventIDSent
}
// CurrentStateSnapshotNID implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) CurrentStateSnapshotNID() types.StateSnapshotNID {
return u.currentStateSnapshotNID
}
// StorePreviousEvents implements types.RoomRecentEventsUpdater - This must be called from a Writer
func (u *LatestEventsUpdater) StorePreviousEvents(eventNID types.EventNID, previousEventReferences []gomatrixserverlib.EventReference) error {
for _, ref := range previousEventReferences {
if err := u.d.PrevEventsTable.InsertPreviousEvent(u.ctx, u.txn, ref.EventID, ref.EventSHA256, eventNID); err != nil {
return fmt.Errorf("u.d.PrevEventsTable.InsertPreviousEvent: %w", err)
}
}
return nil
}
// IsReferenced implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) IsReferenced(eventReference gomatrixserverlib.EventReference) (bool, error) {
err := u.d.PrevEventsTable.SelectPreviousEventExists(u.ctx, u.txn, eventReference.EventID, eventReference.EventSHA256)
if err == nil {
return true, nil
}
if err == sql.ErrNoRows {
return false, nil
}
return false, fmt.Errorf("u.d.PrevEventsTable.SelectPreviousEventExists: %w", err)
}
// SetLatestEvents implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) SetLatestEvents(
roomNID types.RoomNID, latest []types.StateAtEventAndReference, lastEventNIDSent types.EventNID,
currentStateSnapshotNID types.StateSnapshotNID,
) error {
eventNIDs := make([]types.EventNID, len(latest))
for i := range latest {
eventNIDs[i] = latest[i].EventNID
}
return u.d.Writer.Do(u.d.DB, u.txn, func(txn *sql.Tx) error {
if err := u.d.RoomsTable.UpdateLatestEventNIDs(u.ctx, txn, roomNID, eventNIDs, lastEventNIDSent, currentStateSnapshotNID); err != nil {
return fmt.Errorf("u.d.RoomsTable.updateLatestEventNIDs: %w", err)
}
if roomID, ok := u.d.Cache.GetRoomServerRoomID(roomNID); ok {
if roomInfo, ok := u.d.Cache.GetRoomInfo(roomID); ok {
roomInfo.StateSnapshotNID = currentStateSnapshotNID
roomInfo.IsStub = false
u.d.Cache.StoreRoomInfo(roomID, roomInfo)
}
}
return nil
})
}
// HasEventBeenSent implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) HasEventBeenSent(eventNID types.EventNID) (bool, error) {
return u.d.EventsTable.SelectEventSentToOutput(u.ctx, u.txn, eventNID)
}
// MarkEventAsSent implements types.RoomRecentEventsUpdater
func (u *LatestEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error {
return u.d.Writer.Do(u.d.DB, u.txn, func(txn *sql.Tx) error {
return u.d.EventsTable.UpdateEventSentToOutput(u.ctx, txn, eventNID)
})
}
func (u *LatestEventsUpdater) MembershipUpdater(targetUserNID types.EventStateKeyNID, targetLocal bool) (*MembershipUpdater, error) {
return u.d.membershipUpdaterTxn(u.ctx, u.txn, u.roomInfo.RoomNID, targetUserNID, targetLocal)
}