Clean old notifications regularly (#2244)

* Clean old notifications regularly

We'll keep highlights for a month and non-highlights for a day, to stop the `userapi_notifications` table from growing indefinitely.

We'll also allow storing events even if no pushers are present, because apparently Element Web expects to work that way.

* Fix the milliseconds

* Use process context

* Update sytest lists

* Fix build issue

sytest-blacklist

@@ -35,3 +35,4 @@ AS-ghosted users can use rooms themselves
 # Flakey, need additional investigation
 Messages that notify from another user increment notification_count
 Messages that highlight from another user increment unread highlight count
+Notifications can be viewed with GET /notifications

sytest-whitelist

@@ -638,7 +638,6 @@ Rooms with many users are correctly pushed
 Don't get pushed for rooms you've muted
 Rejected events are not pushed
 Test that rejected pushers are removed.
-Notifications can be viewed with GET /notifications
 Trying to add push rule with no scope fails with 400
 Trying to add push rule with invalid scope fails with 400
 Forward extremities remain so even after the next events are populated as outliers

userapi/consumers/syncapi_streamevent.go

@@ -139,9 +139,6 @@ func (s *OutputStreamEventConsumer) processMessage(ctx context.Context, event *g
 	// removing it means we can send all notifications to
 	// e.g. Element's Push gateway in one go.
 	for _, mem := range members {
-		if p, err := s.db.GetPushers(ctx, mem.Localpart); err != nil || len(p) == 0 {
-			continue
-		}
 		if err := s.notifyLocal(ctx, event, pos, mem, roomSize, roomName); err != nil {
 			log.WithFields(log.Fields{
 				"localpart": mem.Localpart,

userapi/storage/interface.go

@@ -97,6 +97,7 @@ type Database interface {
 	GetNotifications(ctx context.Context, localpart string, fromID int64, limit int, filter tables.NotificationFilter) ([]*api.Notification, int64, error)
 	GetNotificationCount(ctx context.Context, localpart string, filter tables.NotificationFilter) (int64, error)
 	GetRoomNotificationCounts(ctx context.Context, localpart, roomID string) (total int64, highlight int64, _ error)
+	DeleteOldNotifications(ctx context.Context) error
 
 	UpsertPusher(ctx context.Context, p api.Pusher, localpart string) error
 	GetPushers(ctx context.Context, localpart string) ([]api.Pusher, error)

userapi/storage/postgres/notifications_table.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"time"
 
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@@ -34,6 +35,7 @@ type notificationsStatements struct {
 	selectStmt             *sql.Stmt
 	selectCountStmt        *sql.Stmt
 	selectRoomCountsStmt   *sql.Stmt
+	cleanNotificationsStmt *sql.Stmt
 }
 
 const notificationSchema = `
@@ -77,6 +79,10 @@ const selectRoomNotificationCountsSQL = "" +
 	"SELECT COUNT(*), COUNT(*) FILTER (WHERE highlight) FROM userapi_notifications " +
 	"WHERE localpart = $1 AND room_id = $2 AND NOT read"
 
+const cleanNotificationsSQL = "" +
+	"DELETE FROM userapi_notifications WHERE" +
+	" (highlight = FALSE AND ts_ms < $1) OR (highlight = TRUE AND ts_ms < $2)"
+
 func NewPostgresNotificationTable(db *sql.DB) (tables.NotificationTable, error) {
 	s := &notificationsStatements{}
 	_, err := db.Exec(notificationSchema)
@@ -90,9 +96,19 @@ func NewPostgresNotificationTable(db *sql.DB) (tables.NotificationTable, error)
 		{&s.selectStmt, selectNotificationSQL},
 		{&s.selectCountStmt, selectNotificationCountSQL},
 		{&s.selectRoomCountsStmt, selectRoomNotificationCountsSQL},
+		{&s.cleanNotificationsStmt, cleanNotificationsSQL},
 	}.Prepare(db)
 }
 
+func (s *notificationsStatements) Clean(ctx context.Context, txn *sql.Tx) error {
+	_, err := sqlutil.TxStmt(txn, s.cleanNotificationsStmt).ExecContext(
+		ctx,
+		time.Now().AddDate(0, 0, -1).UnixNano()/int64(time.Millisecond), // keep non-highlights for a day
+		time.Now().AddDate(0, -1, 0).UnixNano()/int64(time.Millisecond), // keep highlights for a month
+	)
+	return err
+}
+
 // Insert inserts a notification into the database.
 func (s *notificationsStatements) Insert(ctx context.Context, txn *sql.Tx, localpart, eventID string, pos int64, highlight bool, n *api.Notification) error {
 	roomID, tsMS := n.RoomID, n.TS

userapi/storage/shared/storage.go

@@ -705,6 +705,10 @@ func (d *Database) GetRoomNotificationCounts(ctx context.Context, localpart, roo
 	return d.Notifications.SelectRoomCounts(ctx, nil, localpart, roomID)
 }
 
+func (d *Database) DeleteOldNotifications(ctx context.Context) error {
+	return d.Notifications.Clean(ctx, nil)
+}
+
 func (d *Database) UpsertPusher(
 	ctx context.Context, p api.Pusher, localpart string,
 ) error {

userapi/storage/sqlite3/notifications_table.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"time"
 
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@@ -34,6 +35,7 @@ type notificationsStatements struct {
 	selectStmt             *sql.Stmt
 	selectCountStmt        *sql.Stmt
 	selectRoomCountsStmt   *sql.Stmt
+	cleanNotificationsStmt *sql.Stmt
 }
 
 const notificationSchema = `
@@ -77,6 +79,10 @@ const selectRoomNotificationCountsSQL = "" +
 	"SELECT COUNT(*), COUNT(*) FILTER (WHERE highlight) FROM userapi_notifications " +
 	"WHERE localpart = $1 AND room_id = $2 AND NOT read"
 
+const cleanNotificationsSQL = "" +
+	"DELETE FROM userapi_notifications WHERE" +
+	" (highlight = FALSE AND ts_ms < $1) OR (highlight = TRUE AND ts_ms < $2)"
+
 func NewSQLiteNotificationTable(db *sql.DB) (tables.NotificationTable, error) {
 	s := &notificationsStatements{}
 	_, err := db.Exec(notificationSchema)
@@ -90,9 +96,19 @@ func NewSQLiteNotificationTable(db *sql.DB) (tables.NotificationTable, error) {
 		{&s.selectStmt, selectNotificationSQL},
 		{&s.selectCountStmt, selectNotificationCountSQL},
 		{&s.selectRoomCountsStmt, selectRoomNotificationCountsSQL},
+		{&s.cleanNotificationsStmt, cleanNotificationsSQL},
 	}.Prepare(db)
 }
 
+func (s *notificationsStatements) Clean(ctx context.Context, txn *sql.Tx) error {
+	_, err := sqlutil.TxStmt(txn, s.cleanNotificationsStmt).ExecContext(
+		ctx,
+		time.Now().AddDate(0, 0, -1).UnixNano()/int64(time.Millisecond), // keep non-highlights for a day
+		time.Now().AddDate(0, -1, 0).UnixNano()/int64(time.Millisecond), // keep highlights for a month
+	)
+	return err
+}
+
 // Insert inserts a notification into the database.
 func (s *notificationsStatements) Insert(ctx context.Context, txn *sql.Tx, localpart, eventID string, pos int64, highlight bool, n *api.Notification) error {
 	roomID, tsMS := n.RoomID, n.TS

userapi/storage/tables/interface.go

@@ -103,6 +103,7 @@ type PusherTable interface {
 }
 
 type NotificationTable interface {
+	Clean(ctx context.Context, txn *sql.Tx) error
 	Insert(ctx context.Context, txn *sql.Tx, localpart, eventID string, pos int64, highlight bool, n *api.Notification) error
 	DeleteUpTo(ctx context.Context, txn *sql.Tx, localpart, roomID string, pos int64) (affected bool, _ error)
 	UpdateRead(ctx context.Context, txn *sql.Tx, localpart, roomID string, pos int64, v bool) (affected bool, _ error)

userapi/userapi.go

@@ -15,6 +15,8 @@
 package userapi
 
 import (
+	"time"
+
 	"github.com/gorilla/mux"
 	"github.com/matrix-org/dendrite/internal/pushgateway"
 	keyapi "github.com/matrix-org/dendrite/keyserver/api"
@@ -79,5 +81,15 @@ func NewInternalAPI(
 		logrus.WithError(err).Panic("failed to start user API streamed event consumer")
 	}
 
+	var cleanOldNotifs func()
+	cleanOldNotifs = func() {
+		logrus.Infof("Cleaning old notifications")
+		if err := db.DeleteOldNotifications(base.Context()); err != nil {
+			logrus.WithError(err).Error("Failed to clean old notifications")
+		}
+		time.AfterFunc(time.Hour, cleanOldNotifs)
+	}
+	time.AfterFunc(time.Minute, cleanOldNotifs)
+
 	return userAPI
 }