refactor: move typeorm store into new session module

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

src/session/session.service.ts

@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { Inject, Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { TypeormStore } from 'connect-typeorm';
+import { Repository } from 'typeorm';
+
+import { DatabaseType } from '../config/database-type.enum';
+import databaseConfiguration, {
+  DatabaseConfig,
+} from '../config/database.config';
+import { Session } from '../users/session.entity';
+
+@Injectable()
+export class SessionService {
+  private readonly typeormStore: TypeormStore;
+
+  constructor(
+    @InjectRepository(Session) private sessionRepository: Repository<Session>,
+    @Inject(databaseConfiguration.KEY)
+    private dbConfig: DatabaseConfig,
+  ) {
+    this.typeormStore = new TypeormStore({
+      cleanupLimit: 2,
+      limitSubquery: dbConfig.type !== DatabaseType.MARIADB,
+    }).connect(sessionRepository);
+  }
+
+  getTypeormStore(): TypeormStore {
+    return this.typeormStore;
+  }
+}