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Transactional isolation for /sync (#2745)

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This should transactional snapshot isolation for `/sync` etc requests.

For now we don't use repeatable read due to some odd test failures with
invites.
This commit is contained in:
Neil Alexander 2022-09-30 12:48:10 +01:00 • committed by GitHub
parent 8a82f10046
commit 6348486a13
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GPG key ID: 4AEE18F83AFDEB23
37 changed files with 1759 additions and 1527 deletions
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8
syncapi/storage/sqlite3/current_room_state_table.go
View file

@ -367,7 +367,13 @@ func (s *currentRoomStateStatements) SelectEventsWithEventIDs(
for start < len(eventIDs) {
n := minOfInts(len(eventIDs)-start, 999)
query := strings.Replace(selectEventsWithEventIDsSQL, "($1)", sqlutil.QueryVariadic(n), 1)
rows, err := txn.QueryContext(ctx, query, iEventIDs[start:start+n]...)
var rows *sql.Rows
var err error
if txn == nil {
rows, err = s.db.QueryContext(ctx, query, iEventIDs[start:start+n]...)
} else {
rows, err = txn.QueryContext(ctx, query, iEventIDs[start:start+n]...)
}
if err != nil {
return nil, err
}

23
syncapi/storage/sqlite3/invites_table.go
View file

@ -50,7 +50,7 @@ const deleteInviteEventSQL = "" +
"UPDATE syncapi_invite_events SET deleted=true, id=$1 WHERE event_id = $2 AND deleted=false"
const selectInviteEventsInRangeSQL = "" +
"SELECT room_id, headered_event_json, deleted FROM syncapi_invite_events" +
"SELECT id, room_id, headered_event_json, deleted FROM syncapi_invite_events" +
" WHERE target_user_id = $1 AND id > $2 AND id <= $3" +
" ORDER BY id DESC"
@ -132,23 +132,28 @@ func (s *inviteEventsStatements) DeleteInviteEvent(
// active invites for the target user ID in the supplied range.
func (s *inviteEventsStatements) SelectInviteEventsInRange(
ctx context.Context, txn *sql.Tx, targetUserID string, r types.Range,
) (map[string]*gomatrixserverlib.HeaderedEvent, map[string]*gomatrixserverlib.HeaderedEvent, error) {
) (map[string]*gomatrixserverlib.HeaderedEvent, map[string]*gomatrixserverlib.HeaderedEvent, types.StreamPosition, error) {
var lastPos types.StreamPosition
stmt := sqlutil.TxStmt(txn, s.selectInviteEventsInRangeStmt)
rows, err := stmt.QueryContext(ctx, targetUserID, r.Low(), r.High())
if err != nil {
return nil, nil, err
return nil, nil, lastPos, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectInviteEventsInRange: rows.close() failed")
result := map[string]*gomatrixserverlib.HeaderedEvent{}
retired := map[string]*gomatrixserverlib.HeaderedEvent{}
for rows.Next() {
var (
id types.StreamPosition
roomID string
eventJSON []byte
deleted bool
)
if err = rows.Scan(&roomID, &eventJSON, &deleted); err != nil {
return nil, nil, err
if err = rows.Scan(&id, &roomID, &eventJSON, &deleted); err != nil {
return nil, nil, lastPos, err
}
if id > lastPos {
lastPos = id
}
// if we have seen this room before, it has a higher stream position and hence takes priority
@ -161,15 +166,19 @@ func (s *inviteEventsStatements) SelectInviteEventsInRange(
var event *gomatrixserverlib.HeaderedEvent
if err := json.Unmarshal(eventJSON, &event); err != nil {
return nil, nil, err
return nil, nil, lastPos, err
}
if deleted {
retired[roomID] = event
} else {
result[roomID] = event
}
}
return result, retired, nil
if lastPos == 0 {
lastPos = r.To
}
return result, retired, lastPos, nil
}
func (s *inviteEventsStatements) SelectMaxInviteID(

14
syncapi/storage/sqlite3/syncserver.go
View file

@ -49,6 +49,20 @@ func NewDatabase(base *base.BaseDendrite, dbProperties *config.DatabaseOptions)
return &d, nil
}
func (d *SyncServerDatasource) NewDatabaseSnapshot(ctx context.Context) (*shared.DatabaseTransaction, error) {
return &shared.DatabaseTransaction{
Database: &d.Database,
// not setting a transaction because SQLite doesn't support it
}, nil
}
func (d *SyncServerDatasource) NewDatabaseTransaction(ctx context.Context) (*shared.DatabaseTransaction, error) {
return &shared.DatabaseTransaction{
Database: &d.Database,
// not setting a transaction because SQLite doesn't support it
}, nil
}
func (d *SyncServerDatasource) prepare(ctx context.Context) (err error) {
if err = d.streamID.Prepare(d.db); err != nil {
return err