Add housekeeping function to delete old/expired EDUs (#2399)

* Add housekeeping function to delete old/expired EDUs

* Add migrations

* Evict EDUs from cache

* Fix queries

* Fix upgrade

* Use map[string]time.Duration to specify different expiry times

* Fix copy & paste mistake

* Set expires_at to tomorrow

* Don't allow NULL

* Add comment

* Add tests

* Use new testrig package

* Fix migrations

* Never expire m.direct_to_device

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
Co-authored-by: kegsay <kegan@matrix.org>

federationapi/storage/postgres/deltas/2022042812473400_addexpiresat.go

@@ -0,0 +1,44 @@
+// Copyright 2022 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package deltas
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"time"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+func UpAddexpiresat(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, "ALTER TABLE federationsender_queue_edus ADD COLUMN IF NOT EXISTS expires_at BIGINT NOT NULL DEFAULT 0;")
+	if err != nil {
+		return fmt.Errorf("failed to execute upgrade: %w", err)
+	}
+	_, err = tx.ExecContext(ctx, "UPDATE federationsender_queue_edus SET expires_at = $1 WHERE edu_type != 'm.direct_to_device'", gomatrixserverlib.AsTimestamp(time.Now().Add(time.Hour*24)))
+	if err != nil {
+		return fmt.Errorf("failed to update queue_edus: %w", err)
+	}
+	return nil
+}
+
+func DownAddexpiresat(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, "ALTER TABLE federationsender_queue_edus DROP COLUMN expires_at;")
+	if err != nil {
+		return fmt.Errorf("failed to execute downgrade: %w", err)
+	}
+	return nil
+}