Добавлен источник данных для журнала изменений

src/couchdb-datasources/changes.ts

@@ -0,0 +1,32 @@
+import { CouchDb } from '@app/event-emitter/couchdb-datasources/couchdb';
+import { Injectable, Logger } from '@nestjs/common';
+import nano from 'nano';
+
+@Injectable()
+export class Changes {
+  private static logger = new Logger(Changes.name);
+  private static changesDb = null;
+  private static initilized = false;
+
+  // TODO: Указать полные типы данных
+
+  static async getDatasource(): Promise<nano.DocumentScope<any>> {
+    if (Changes.initilized) {
+      return Changes.changesDb;
+    }
+    Changes.initilized = true;
+    const n = CouchDb.getCouchDb();
+    const changesDbName = ''; // TODO: Загрузить из конфига
+    const dbs = await n.db.list();
+    if (!dbs.includes(changesDbName)) {
+      await n.db.create(changesDbName);
+    }
+    Changes.changesDb = await n.db.use(changesDbName);
+    Changes.logger.log(`Connected to changes db - ${changesDbName}`);
+    return Changes.changesDb;
+  }
+
+  async getDatasource(): Promise<nano.DocumentScope<any>> {
+    return await Changes.getDatasource();
+  }
+}