#4 added duplicate check for wall_post_new

src/service/vk/handlers/PostNewHandler.ts

@@ -41,14 +41,26 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
   private likes: string[] = ["👎", "👍"];
 
   public execute = async (context: WallPostContext, next: NextMiddleware) => {
+    const id = context?.wall?.id;
+
     if (
       context.isRepost ||
-      !PostNewHandler.isValidPostType(context?.wall?.postType)
+      !PostNewHandler.isValidPostType(context?.wall?.postType) ||
+      !id
     ) {
       await next();
       return;
     }
 
+    const exist = await this.getEventFromDB(id);
+    if (exist) {
+      logger.warn(
+        `received duplicate entry for ${this.group.name}, ${this.type}, ${id}`
+      );
+      await next();
+      return;
+    }
+
     const user = context.wall.signerId
       ? await this.getUserByID(String(context.wall.signerId))
       : undefined;
@@ -67,7 +79,13 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
 
     this.appendExtras(extras, text);
 
-    await this.telegram.sendMessageToChan(this.channel, parsed, extras);
+    const msg = await this.telegram.sendMessageToChan(
+      this.channel,
+      parsed,
+      extras
+    );
+
+    await this.storeInDB(id, msg.message_id);
 
     await next();
   };

src/service/vk/handlers/VkEventHandler.ts

@@ -4,6 +4,7 @@ import { VkService } from "../index";
 import { TelegramService } from "../../telegram";
 import { Template } from "../../template";
 import { Storage } from "../../db";
+import { Event } from "../../db/postgres/entities/Event";
 
 export class VkEventHandler<
   F extends Record<string, any> = any,
@@ -46,4 +47,28 @@ export class VkEventHandler<
    */
   protected makeDialogUrl = (groupId: number, userId: number): string =>
     `https://vk.com/gim${groupId}?sel=${userId}`;
+
+  /**
+   * Checks for duplicates
+   */
+  getEventFromDB = async (id?: number): Promise<Event | undefined> => {
+    if (!id) {
+      return undefined;
+    }
+
+    return await this.db.getEvent(this.type, id, this.group.id, this.channel);
+  };
+
+  /**
+   * Creates event record in DB
+   */
+  storeInDB = async (id: number, tgMessageId: number) => {
+    return await this.db.createEvent(
+      this.type,
+      id,
+      this.group.id,
+      this.channel,
+      tgMessageId
+    );
+  };
 }