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Track the current state of the room (#24)

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* Add method for calculating the room state after a list of events

* Fill out AddsState and RemovesState fields in the output event

* comment on return value

* Fix whitespace

* Clarify the meaning of LastEventIDSent

* Be more explicit on what the snapshot is

* Fix comments

* Comment on why we want the state after the previous events
This commit is contained in:
Mark Haines 2017-03-07 10:25:01 +00:00 committed by GitHub
parent 9a8a8aedcb
commit 96fc9294cc
8 changed files with 287 additions and 74 deletions
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8
src/github.com/matrix-org/dendrite/roomserver/input/events.go
View file

@ -38,9 +38,9 @@ type RoomEventDatabase interface {
// The RoomRecentEventsUpdater must have Commit or Rollback called on it if this doesn't return an error.
// Returns the latest events in the room and the last eventID sent to the log along with an updater.
// If this returns an error then no further action is required.
GetLatestEventsForUpdate(roomNID types.RoomNID) (
latestEvents []types.StateAtEventAndReference, lastEventIDSent string, updater types.RoomRecentEventsUpdater, err error,
)
GetLatestEventsForUpdate(roomNID types.RoomNID) (updater types.RoomRecentEventsUpdater, err error)
// Lookup the string event IDs for a list of numeric event IDs
EventIDs(eventNIDs []types.EventNID) (map[types.EventNID]string, error)
}
// OutputRoomEventWriter has the APIs needed to write an event to the output logs.
@ -91,7 +91,7 @@ func processRoomEvent(db RoomEventDatabase, ow OutputRoomEventWriter, input api.
}
} else {
// We haven't been told what the state at the event is so we need to calculate it from the prev_events
if stateAtEvent.BeforeStateSnapshotNID, err = calculateAndStoreState(db, event, roomNID); err != nil {
if stateAtEvent.BeforeStateSnapshotNID, err = calculateAndStoreStateBeforeEvent(db, event, roomNID); err != nil {
return err
}
}

60
src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go
View file

@ -26,7 +26,7 @@ import (
func updateLatestEvents(
db RoomEventDatabase, ow OutputRoomEventWriter, roomNID types.RoomNID, stateAtEvent types.StateAtEvent, event gomatrixserverlib.Event,
) (err error) {
oldLatest, lastEventIDSent, updater, err := db.GetLatestEventsForUpdate(roomNID)
updater, err := db.GetLatestEventsForUpdate(roomNID)
if err != nil {
return
}
@ -44,16 +44,19 @@ func updateLatestEvents(
}
}()
err = doUpdateLatestEvents(updater, ow, oldLatest, lastEventIDSent, roomNID, stateAtEvent, event)
err = doUpdateLatestEvents(db, updater, ow, roomNID, stateAtEvent, event)
return
}
func doUpdateLatestEvents(
updater types.RoomRecentEventsUpdater, ow OutputRoomEventWriter, oldLatest []types.StateAtEventAndReference, lastEventIDSent string, roomNID types.RoomNID, stateAtEvent types.StateAtEvent, event gomatrixserverlib.Event,
db RoomEventDatabase, updater types.RoomRecentEventsUpdater, ow OutputRoomEventWriter, roomNID types.RoomNID, stateAtEvent types.StateAtEvent, event gomatrixserverlib.Event,
) error {
var err error
var prevEvents []gomatrixserverlib.EventReference
prevEvents = event.PrevEvents()
oldLatest := updater.LatestEvents()
lastEventIDSent := updater.LastEventIDSent()
oldStateNID := updater.CurrentStateSnapshotNID()
if hasBeenSent, err := updater.HasEventBeenSent(stateAtEvent.EventNID); err != nil {
return err
@ -78,6 +81,20 @@ func doUpdateLatestEvents(
StateAtEvent: stateAtEvent,
})
latestStateAtEvents := make([]types.StateAtEvent, len(newLatest))
for i := range newLatest {
latestStateAtEvents[i] = newLatest[i].StateAtEvent
}
newStateNID, err := calculateAndStoreStateAfterEvents(db, roomNID, latestStateAtEvents)
if err != nil {
return err
}
removed, added, err := differenceBetweeenStateSnapshots(db, oldStateNID, newStateNID)
if err != nil {
return err
}
// Send the event to the output logs.
// We do this inside the database transaction to ensure that we only mark an event as sent if we sent it.
// (n.b. this means that it's possible that the same event will be sent twice if the transaction fails but
@ -86,11 +103,11 @@ func doUpdateLatestEvents(
// send the event asynchronously but we would need to ensure that 1) the events are written to the log in
// the correct order, 2) that pending writes are resent across restarts. In order to avoid writing all the
// necessary bookkeeping we'll keep the event sending synchronous for now.
if err = writeEvent(ow, lastEventIDSent, event, newLatest); err != nil {
if err = writeEvent(db, ow, lastEventIDSent, event, newLatest, removed, added); err != nil {
return err
}
if err = updater.SetLatestEvents(roomNID, newLatest, stateAtEvent.EventNID); err != nil {
if err = updater.SetLatestEvents(roomNID, newLatest, stateAtEvent.EventNID, newStateNID); err != nil {
return err
}
@ -134,18 +151,41 @@ func calculateLatest(oldLatest []types.StateAtEventAndReference, alreadyReferenc
return newLatest
}
func writeEvent(ow OutputRoomEventWriter, lastEventIDSent string, event gomatrixserverlib.Event, latest []types.StateAtEventAndReference) error {
func writeEvent(
db RoomEventDatabase, ow OutputRoomEventWriter, lastEventIDSent string,
event gomatrixserverlib.Event, latest []types.StateAtEventAndReference,
removed, added []types.StateEntry,
) error {
latestEventIDs := make([]string, len(latest))
for i := range latest {
latestEventIDs[i] = latest[i].EventID
}
// TODO: Fill out AddsStateEventIDs and RemovesStateEventIDs
// TODO: Fill out VisibilityStateIDs
return ow.WriteOutputRoomEvent(api.OutputRoomEvent{
ore := api.OutputRoomEvent{
Event: event.JSON(),
LastSentEventID: lastEventIDSent,
LatestEventIDs: latestEventIDs,
})
}
var stateEventNIDs []types.EventNID
for _, entry := range added {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range removed {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
eventIDMap, err := db.EventIDs(stateEventNIDs)
if err != nil {
return err
}
for _, entry := range added {
ore.AddsStateEventIDs = append(ore.AddsStateEventIDs, eventIDMap[entry.EventNID])
}
for _, entry := range removed {
ore.RemovesStateEventIDs = append(ore.RemovesStateEventIDs, eventIDMap[entry.EventNID])
}
// TODO: Fill out VisibilityStateIDs
return ow.WriteOutputRoomEvent(ore)
}

119
src/github.com/matrix-org/dendrite/roomserver/input/state.go
View file

@ -9,8 +9,8 @@ import (
// calculateAndStoreState calculates a snapshot of the state of a room before an event.
// Stores the snapshot of the state in the database.
// Returns a numeric ID for that snapshot.
func calculateAndStoreState(
// Returns a numeric ID for the snapshot of the state before the event.
func calculateAndStoreStateBeforeEvent(
db RoomEventDatabase, event gomatrixserverlib.Event, roomNID types.RoomNID,
) (types.StateSnapshotNID, error) {
// Load the state at the prev events.
@ -25,6 +25,13 @@ func calculateAndStoreState(
return 0, err
}
// The state before this event will be the state after the events that came before it.
return calculateAndStoreStateAfterEvents(db, roomNID, prevStates)
}
// calculateAndStoreStateAfterEvents finds the room state after the given events.
// Stores the resulting state in the database and returns a numeric ID for that snapshot.
func calculateAndStoreStateAfterEvents(db RoomEventDatabase, roomNID types.RoomNID, prevStates []types.StateAtEvent) (types.StateSnapshotNID, error) {
if len(prevStates) == 0 {
// 2) There weren't any prev_events for this event so the state is
// empty.
@ -55,9 +62,9 @@ func calculateAndStoreState(
)
}
// If there are too many deltas then we need to calculate the full state
// So fall through to calculateAndStoreStateMany
// So fall through to calculateAndStoreStateAfterManyEvents
}
return calculateAndStoreStateMany(db, roomNID, prevStates)
return calculateAndStoreStateAfterManyEvents(db, roomNID, prevStates)
}
// maxStateBlockNIDs is the maximum number of state data blocks to use to encode a snapshot of room state.
@ -67,10 +74,10 @@ func calculateAndStoreState(
// TODO: Tune this to get the right balance between size and lookup performance.
const maxStateBlockNIDs = 64
// calculateAndStoreStateMany calculates the state of the room before an event
// using the states at each of the event's prev events.
// calculateAndStoreStateAfterManyEvents finds the room state after the given events.
// This handles the slow path of calculateAndStoreStateAfterEvents for when there is more than one event.
// Stores the resulting state and returns a numeric ID for the snapshot.
func calculateAndStoreStateMany(db RoomEventDatabase, roomNID types.RoomNID, prevStates []types.StateAtEvent) (types.StateSnapshotNID, error) {
func calculateAndStoreStateAfterManyEvents(db RoomEventDatabase, roomNID types.RoomNID, prevStates []types.StateAtEvent) (types.StateSnapshotNID, error) {
// Conflict resolution.
// First stage: load the state after each of the prev events.
combined, err := loadCombinedStateAfterEvents(db, prevStates)
@ -107,6 +114,98 @@ func calculateAndStoreStateMany(db RoomEventDatabase, roomNID types.RoomNID, pre
return db.AddState(roomNID, nil, state)
}
// differenceBetweeenStateSnapshots works out which state entries have been added and removed between two snapshots.
func differenceBetweeenStateSnapshots(db RoomEventDatabase, oldStateNID, newStateNID types.StateSnapshotNID) (
removed, added []types.StateEntry, err error,
) {
if oldStateNID == newStateNID {
// If the snapshot NIDs are the same then nothing has changed
return nil, nil, nil
}
var oldEntries []types.StateEntry
var newEntries []types.StateEntry
if oldStateNID != 0 {
oldEntries, err = loadStateAtSnapshot(db, oldStateNID)
if err != nil {
return nil, nil, err
}
}
if newStateNID != 0 {
newEntries, err = loadStateAtSnapshot(db, newStateNID)
if err != nil {
return nil, nil, err
}
}
var oldI int
var newI int
for {
switch {
case oldI == len(oldEntries):
// We've reached the end of the old entries.
// The rest of the new list must have been newly added.
added = append(added, newEntries[newI:]...)
return
case newI == len(newEntries):
// We've reached the end of the new entries.
// The rest of the old list must be have been removed.
removed = append(removed, oldEntries[oldI:]...)
return
case oldEntries[oldI] == newEntries[newI]:
// The entry is in both lists so skip over it.
oldI++
newI++
case oldEntries[oldI].LessThan(newEntries[newI]):
// The lists are sorted so the old entry being less than the new entry means that it only appears in the old list.
removed = append(removed, oldEntries[oldI])
oldI++
default:
// Reaching the default case implies that the new entry is less than the old entry.
// Since the lists are sorted this means that it only appears in the new list.
added = append(added, newEntries[newI])
newI++
}
}
}
// loadStateAtSnapshot loads the full state of a room at a particular snapshot.
// This is typically the state before an event or the current state of a room.
// Returns a sorted list of state entries or an error if there was a problem talking to the database.
func loadStateAtSnapshot(db RoomEventDatabase, stateNID types.StateSnapshotNID) ([]types.StateEntry, error) {
stateBlockNIDLists, err := db.StateBlockNIDs([]types.StateSnapshotNID{stateNID})
if err != nil {
return nil, err
}
stateBlockNIDList := stateBlockNIDLists[0]
stateEntryLists, err := db.StateEntries(stateBlockNIDList.StateBlockNIDs)
if err != nil {
return nil, err
}
stateEntriesMap := stateEntryListMap(stateEntryLists)
// Combined all the state entries for this snapshot.
// The order of state block NIDs in the list tells us the order to combine them in.
var fullState []types.StateEntry
for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
entries, ok := stateEntriesMap.lookup(stateBlockNID)
if !ok {
// This should only get hit if the database is corrupt.
// It should be impossible for an event to reference a NID that doesn't exist
panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
}
fullState = append(fullState, entries...)
}
// Stable sort so that the most recent entry for each state key stays
// remains later in the list than the older entries for the same state key.
sort.Stable(stateEntryByStateKeySorter(fullState))
// Unique returns the last entry and hence the most recent entry for each state key.
fullState = fullState[:unique(stateEntryByStateKeySorter(fullState))]
return fullState, nil
}
// loadCombinedStateAfterEvents loads a snapshot of the state after each of the events
// and combines those snapshots together into a single list.
func loadCombinedStateAfterEvents(db RoomEventDatabase, prevStates []types.StateAtEvent) ([]types.StateEntry, error) {
@ -146,18 +245,18 @@ func loadCombinedStateAfterEvents(db RoomEventDatabase, prevStates []types.State
if !ok {
// This should only get hit if the database is corrupt.
// It should be impossible for an event to reference a NID that doesn't exist
panic(fmt.Errorf("Corrupt DB: Missing state numeric ID %d", prevState.BeforeStateSnapshotNID))
panic(fmt.Errorf("Corrupt DB: Missing state snapshot numeric ID %d", prevState.BeforeStateSnapshotNID))
}
// Combined all the state entries for this snapshot.
// The order of state data NIDs in the list tells us the order to combine them in.
// The order of state block NIDs in the list tells us the order to combine them in.
var fullState []types.StateEntry
for _, stateBlockNID := range stateBlockNIDs {
entries, ok := stateEntriesMap.lookup(stateBlockNID)
if !ok {
// This should only get hit if the database is corrupt.
// It should be impossible for an event to reference a NID that doesn't exist
panic(fmt.Errorf("Corrupt DB: Missing state numeric ID %d", prevState.BeforeStateSnapshotNID))
panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
}
fullState = append(fullState, entries...)
}

2
src/github.com/matrix-org/dendrite/roomserver/roomserver-integration-tests/main.go
View file

@ -356,7 +356,7 @@ func main() {
},
"VisibilityEventIDs":null,
"LatestEventIDs":["$1463671339126270PnVwC:matrix.org"],
"AddsStateEventIDs":null,
"AddsStateEventIDs":["$1463671337126266wrSBX:matrix.org", "$1463671339126270PnVwC:matrix.org"],
"RemovesStateEventIDs":null,
"LastSentEventID":""
}`,

75
src/github.com/matrix-org/dendrite/roomserver/storage/events_table.go
View file

@ -87,6 +87,9 @@ const bulkSelectStateAtEventAndReferenceSQL = "" +
const bulkSelectEventReferenceSQL = "" +
"SELECT event_id, reference_sha256 FROM events WHERE event_nid = ANY($1)"
const bulkSelectEventIDSQL = "" +
"SELECT event_nid, event_id FROM events WHERE event_nid = ANY($1)"
type eventStatements struct {
insertEventStmt *sql.Stmt
selectEventStmt *sql.Stmt
@ -98,6 +101,7 @@ type eventStatements struct {
selectEventIDStmt *sql.Stmt
bulkSelectStateAtEventAndReferenceStmt *sql.Stmt
bulkSelectEventReferenceStmt *sql.Stmt
bulkSelectEventIDStmt *sql.Stmt
}
func (s *eventStatements) prepare(db *sql.DB) (err error) {
@ -105,36 +109,30 @@ func (s *eventStatements) prepare(db *sql.DB) (err error) {
if err != nil {
return
}
if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
statements := []struct {
statement **sql.Stmt
sql string
}{
{&s.insertEventStmt, insertEventSQL},
{&s.selectEventStmt, selectEventSQL},
{&s.bulkSelectStateEventByIDStmt, bulkSelectStateEventByIDSQL},
{&s.bulkSelectStateAtEventByIDStmt, bulkSelectStateAtEventByIDSQL},
{&s.updateEventStateStmt, updateEventStateSQL},
{&s.updateEventSentToOutputStmt, updateEventSentToOutputSQL},
{&s.selectEventSentToOutputStmt, selectEventSentToOutputSQL},
{&s.selectEventIDStmt, selectEventIDSQL},
{&s.bulkSelectStateAtEventAndReferenceStmt, bulkSelectStateAtEventAndReferenceSQL},
{&s.bulkSelectEventReferenceStmt, bulkSelectEventReferenceSQL},
{&s.bulkSelectEventIDStmt, bulkSelectEventIDSQL},
}
for _, statement := range statements {
if *statement.statement, err = db.Prepare(statement.sql); err != nil {
return
}
if s.selectEventStmt, err = db.Prepare(selectEventSQL); err != nil {
return
}
if s.bulkSelectStateEventByIDStmt, err = db.Prepare(bulkSelectStateEventByIDSQL); err != nil {
return
}
if s.bulkSelectStateAtEventByIDStmt, err = db.Prepare(bulkSelectStateAtEventByIDSQL); err != nil {
return
}
if s.updateEventStateStmt, err = db.Prepare(updateEventStateSQL); err != nil {
return
}
if s.updateEventSentToOutputStmt, err = db.Prepare(updateEventSentToOutputSQL); err != nil {
return
}
if s.selectEventSentToOutputStmt, err = db.Prepare(selectEventSentToOutputSQL); err != nil {
return
}
if s.selectEventIDStmt, err = db.Prepare(selectEventIDSQL); err != nil {
return
}
if s.bulkSelectStateAtEventAndReferenceStmt, err = db.Prepare(bulkSelectStateAtEventAndReferenceSQL); err != nil {
return
}
if s.bulkSelectEventReferenceStmt, err = db.Prepare(bulkSelectEventReferenceSQL); err != nil {
return
}
return
}
@ -297,6 +295,29 @@ func (s *eventStatements) bulkSelectEventReference(eventNIDs []types.EventNID) (
return results, nil
}
// bulkSelectEventID returns a map from numeric event ID to string event ID.
func (s *eventStatements) bulkSelectEventID(eventNIDs []types.EventNID) (map[types.EventNID]string, error) {
rows, err := s.bulkSelectEventIDStmt.Query(eventNIDsAsArray(eventNIDs))
if err != nil {
return nil, err
}
defer rows.Close()
results := make(map[types.EventNID]string, len(eventNIDs))
i := 0
for ; rows.Next(); i++ {
var eventNID int64
var eventID string
if err = rows.Scan(&eventNID, &eventID); err != nil {
return nil, err
}
results[types.EventNID(eventNID)] = eventID
}
if i != len(eventNIDs) {
return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
}
return results, nil
}
func eventNIDsAsArray(eventNIDs []types.EventNID) pq.Int64Array {
nids := make([]int64, len(eventNIDs))
for i := range eventNIDs {

29
src/github.com/matrix-org/dendrite/roomserver/storage/rooms_table.go
View file

@ -18,7 +18,10 @@ CREATE TABLE IF NOT EXISTS rooms (
-- (The server will be in that state while it stores the events for the initial state of the room)
latest_event_nids BIGINT[] NOT NULL DEFAULT '{}'::BIGINT[],
-- The last event written to the output log for this room.
last_event_sent_nid BIGINT NOT NULL DEFAULT 0
last_event_sent_nid BIGINT NOT NULL DEFAULT 0,
-- The state of the room after the current set of latest events.
-- This will be 0 if there are no latest events in the room.
state_snapshot_nid BIGINT NOT NULL DEFAULT 0
);
`
@ -35,10 +38,10 @@ const selectLatestEventNIDsSQL = "" +
"SELECT latest_event_nids FROM rooms WHERE room_nid = $1"
const selectLatestEventNIDsForUpdateSQL = "" +
"SELECT latest_event_nids, last_event_sent_nid FROM rooms WHERE room_nid = $1 FOR UPDATE"
"SELECT latest_event_nids, last_event_sent_nid, state_snapshot_nid FROM rooms WHERE room_nid = $1 FOR UPDATE"
const updateLatestEventNIDsSQL = "" +
"UPDATE rooms SET latest_event_nids = $2, last_event_sent_nid = $3 WHERE room_nid = $1"
"UPDATE rooms SET latest_event_nids = $2, last_event_sent_nid = $3, state_snapshot_nid = $4 WHERE room_nid = $1"
type roomStatements struct {
insertRoomNIDStmt *sql.Stmt
@ -96,21 +99,29 @@ func (s *roomStatements) selectLatestEventNIDs(roomNID types.RoomNID) ([]types.E
return eventNIDs, nil
}
func (s *roomStatements) selectLatestEventsNIDsForUpdate(txn *sql.Tx, roomNID types.RoomNID) ([]types.EventNID, types.EventNID, error) {
func (s *roomStatements) selectLatestEventsNIDsForUpdate(txn *sql.Tx, roomNID types.RoomNID) (
[]types.EventNID, types.EventNID, types.StateSnapshotNID, error,
) {
var nids pq.Int64Array
var lastEventSentNID int64
err := txn.Stmt(s.selectLatestEventNIDsForUpdateStmt).QueryRow(int64(roomNID)).Scan(&nids, &lastEventSentNID)
var stateSnapshotNID int64
err := txn.Stmt(s.selectLatestEventNIDsForUpdateStmt).QueryRow(int64(roomNID)).Scan(&nids, &lastEventSentNID, &stateSnapshotNID)
if err != nil {
return nil, 0, err
return nil, 0, 0, err
}
eventNIDs := make([]types.EventNID, len(nids))
for i := range nids {
eventNIDs[i] = types.EventNID(nids[i])
}
return eventNIDs, types.EventNID(lastEventSentNID), nil
return eventNIDs, types.EventNID(lastEventSentNID), types.StateSnapshotNID(stateSnapshotNID), nil
}
func (s *roomStatements) updateLatestEventNIDs(txn *sql.Tx, roomNID types.RoomNID, eventNIDs []types.EventNID, lastEventSentNID types.EventNID) error {
_, err := txn.Stmt(s.updateLatestEventNIDsStmt).Exec(roomNID, eventNIDsAsArray(eventNIDs), int64(lastEventSentNID))
func (s *roomStatements) updateLatestEventNIDs(
txn *sql.Tx, roomNID types.RoomNID, eventNIDs []types.EventNID, lastEventSentNID types.EventNID,
stateSnapshotNID types.StateSnapshotNID,
) error {
_, err := txn.Stmt(s.updateLatestEventNIDsStmt).Exec(
roomNID, eventNIDsAsArray(eventNIDs), int64(lastEventSentNID), int64(stateSnapshotNID),
)
return err
}

51
src/github.com/matrix-org/dendrite/roomserver/storage/storage.go
View file

@ -205,38 +205,62 @@ func (d *Database) StateEntries(stateBlockNIDs []types.StateBlockNID) ([]types.S
return d.statements.bulkSelectStateDataEntries(stateBlockNIDs)
}
// EventIDs implements input.RoomEventDatabase
func (d *Database) EventIDs(eventNIDs []types.EventNID) (map[types.EventNID]string, error) {
return d.statements.bulkSelectEventID(eventNIDs)
}
// GetLatestEventsForUpdate implements input.EventDatabase
func (d *Database) GetLatestEventsForUpdate(roomNID types.RoomNID) ([]types.StateAtEventAndReference, string, types.RoomRecentEventsUpdater, error) {
func (d *Database) GetLatestEventsForUpdate(roomNID types.RoomNID) (types.RoomRecentEventsUpdater, error) {
txn, err := d.db.Begin()
if err != nil {
return nil, "", nil, err
return nil, err
}
eventNIDs, lastEventNIDSent, err := d.statements.selectLatestEventsNIDsForUpdate(txn, roomNID)
eventNIDs, lastEventNIDSent, currentStateSnapshotNID, err := d.statements.selectLatestEventsNIDsForUpdate(txn, roomNID)
if err != nil {
txn.Rollback()
return nil, "", nil, err
return nil, err
}
stateAndRefs, err := d.statements.bulkSelectStateAtEventAndReference(txn, eventNIDs)
if err != nil {
txn.Rollback()
return nil, "", nil, err
return nil, err
}
var lastEventIDSent string
if lastEventNIDSent != 0 {
lastEventIDSent, err = d.statements.selectEventID(txn, lastEventNIDSent)
if err != nil {
txn.Rollback()
return nil, "", nil, err
return nil, err
}
}
return stateAndRefs, lastEventIDSent, &roomRecentEventsUpdater{txn, d}, nil
return &roomRecentEventsUpdater{txn, d, stateAndRefs, lastEventIDSent, currentStateSnapshotNID}, nil
}
type roomRecentEventsUpdater struct {
txn *sql.Tx
d *Database
latestEvents []types.StateAtEventAndReference
lastEventIDSent string
currentStateSnapshotNID types.StateSnapshotNID
}
// LatestEvents implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) LatestEvents() []types.StateAtEventAndReference {
return u.latestEvents
}
// LastEventIDSent implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) LastEventIDSent() string {
return u.lastEventIDSent
}
// CurrentStateSnapshotNID implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) CurrentStateSnapshotNID() types.StateSnapshotNID {
return u.currentStateSnapshotNID
}
// StorePreviousEvents implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) StorePreviousEvents(eventNID types.EventNID, previousEventReferences []gomatrixserverlib.EventReference) error {
for _, ref := range previousEventReferences {
if err := u.d.statements.insertPreviousEvent(u.txn, ref.EventID, ref.EventSHA256, eventNID); err != nil {
@ -246,6 +270,7 @@ func (u *roomRecentEventsUpdater) StorePreviousEvents(eventNID types.EventNID, p
return nil
}
// IsReferenced implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) IsReferenced(eventReference gomatrixserverlib.EventReference) (bool, error) {
err := u.d.statements.selectPreviousEventExists(u.txn, eventReference.EventID, eventReference.EventSHA256)
if err == nil {
@ -257,26 +282,34 @@ func (u *roomRecentEventsUpdater) IsReferenced(eventReference gomatrixserverlib.
return false, err
}
func (u *roomRecentEventsUpdater) SetLatestEvents(roomNID types.RoomNID, latest []types.StateAtEventAndReference, lastEventNIDSent types.EventNID) error {
// SetLatestEvents implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) 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.statements.updateLatestEventNIDs(u.txn, roomNID, eventNIDs, lastEventNIDSent)
return u.d.statements.updateLatestEventNIDs(u.txn, roomNID, eventNIDs, lastEventNIDSent, currentStateSnapshotNID)
}
// HasEventBeenSent implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) HasEventBeenSent(eventNID types.EventNID) (bool, error) {
return u.d.statements.selectEventSentToOutput(u.txn, eventNID)
}
// MarkEventAsSent implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error {
return u.d.statements.updateEventSentToOutput(u.txn, eventNID)
}
// Commit implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) Commit() error {
return u.txn.Commit()
}
// Rollback implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) Rollback() error {
return u.txn.Rollback()
}

11
src/github.com/matrix-org/dendrite/roomserver/types/types.go
View file

@ -133,6 +133,12 @@ type StateEntryList struct {
// (On postgresql this wraps a database transaction that holds a "FOR UPDATE"
// lock on the row holding the latest events for the room.)
type RoomRecentEventsUpdater interface {
// The latest event IDs and state in the room.
LatestEvents() []StateAtEventAndReference
// The event ID of the latest event written to the output log in the room.
LastEventIDSent() string
// The current state of the room.
CurrentStateSnapshotNID() StateSnapshotNID
// Store the previous events referenced by an event.
// This adds the event NID to an entry in the database for each of the previous events.
// If there isn't an entry for one of previous events then an entry is created.
@ -143,7 +149,10 @@ type RoomRecentEventsUpdater interface {
IsReferenced(eventReference gomatrixserverlib.EventReference) (bool, error)
// Set the list of latest events for the room.
// This replaces the current list stored in the database with the given list
SetLatestEvents(roomNID RoomNID, latest []StateAtEventAndReference, lastEventNIDSent EventNID) error
SetLatestEvents(
roomNID RoomNID, latest []StateAtEventAndReference, lastEventNIDSent EventNID,
currentStateSnapshotNID StateSnapshotNID,
) error
// Check if the event has already be written to the output logs.
HasEventBeenSent(eventNID EventNID) (bool, error)
// Mark the event as having been sent to the output logs.