fix(backend): Remove Meilisearch index when notes are deleted (#10988)

* fix(backend): Include feature to delete Meilisearch index notes

* Update variable name
`cascadingNotesFilter` -> `federatedLocalCascadingNotes`

* tweak

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

3 files changed, 26 insertions, 3 deletions

diff --git a/packages/backend/src/core/NoteDeleteService.ts b/packages/backend/src/core/NoteDeleteService.ts
index 10381c7e65..f77ea8aab4 100644
--- a/packages/backend/src/core/NoteDeleteService.ts
+++ b/packages/backend/src/core/NoteDeleteService.ts
@@ -17,6 +17,7 @@ import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { MetaService } from '@/core/MetaService.js';
+import { SearchService } from '@/core/SearchService.js';
 
 @Injectable()
 export class NoteDeleteService {
@@ -41,6 +42,7 @@ export class NoteDeleteService {
 		private apRendererService: ApRendererService,
 		private apDeliverManagerService: ApDeliverManagerService,
 		private metaService: MetaService,
+		private searchService: SearchService,
 		private notesChart: NotesChart,
 		private perUserNotesChart: PerUserNotesChart,
 		private instanceChart: InstanceChart,
@@ -53,6 +55,7 @@ export class NoteDeleteService {
 	 */
 	async delete(user: { id: User['id']; uri: User['uri']; host: User['host']; isBot: User['isBot']; }, note: Note, quiet = false) {
 		const deletedAt = new Date();
+		const cascadingNotes = await this.findCascadingNotes(note);
 
 		// この投稿を除く指定したユーザーによる指定したノートのリノートが存在しないとき
 		if (note.renoteId && (await this.noteEntityService.countSameRenotes(user.id, note.renoteId, note.id)) === 0) {
@@ -88,8 +91,8 @@ export class NoteDeleteService {
 			}
 
 			// also deliever delete activity to cascaded notes
-			const cascadingNotes = (await this.findCascadingNotes(note)).filter(note => !note.localOnly); // filter out local-only notes
-			for (const cascadingNote of cascadingNotes) {
+			const federatedLocalCascadingNotes = (cascadingNotes).filter(note => !note.localOnly && note.userHost == null); // filter out local-only notes
+			for (const cascadingNote of federatedLocalCascadingNotes) {
 				if (!cascadingNote.user) continue;
 				if (!this.userEntityService.isLocalUser(cascadingNote.user)) continue;
 				const content = this.apRendererService.addContext(this.apRendererService.renderDelete(this.apRendererService.renderTombstone(`${this.config.url}/notes/${cascadingNote.id}`), cascadingNote.user));
@@ -114,6 +117,11 @@ export class NoteDeleteService {
 			}
 		}
 
+		for (const cascadingNote of cascadingNotes) {
+			this.searchService.unindexNote(cascadingNote);
+		}
+		this.searchService.unindexNote(note);
+
 		await this.notesRepository.delete({
 			id: note.id,
 			userId: user.id,
@@ -140,7 +148,7 @@ export class NoteDeleteService {
 
 		const cascadingNotes: Note[] = await recursive(note.id);
 
-		return cascadingNotes.filter(note => note.userHost === null); // filter out non-local users
+		return cascadingNotes;
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/SearchService.ts b/packages/backend/src/core/SearchService.ts
index 956c4cc09c..28b8ee8073 100644
--- a/packages/backend/src/core/SearchService.ts
+++ b/packages/backend/src/core/SearchService.ts
@@ -116,6 +116,15 @@ export class SearchService {
 	}
 
 	@bindThis
+	public async unindexNote(note: Note): Promise<void> {
+		if (!['home', 'public'].includes(note.visibility)) return;
+
+		if (this.meilisearch) {
+			this.meilisearchNoteIndex!.deleteDocument(note.id);
+		}
+	}
+
+	@bindThis
 	public async searchNote(q: string, me: User | null, opts: {
 		userId?: Note['userId'] | null;
 		channelId?: Note['channelId'] | null;
diff --git a/packages/backend/src/queue/processors/DeleteAccountProcessorService.ts b/packages/backend/src/queue/processors/DeleteAccountProcessorService.ts
index 39dd801af0..65ded170b7 100644
--- a/packages/backend/src/queue/processors/DeleteAccountProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeleteAccountProcessorService.ts
@@ -12,6 +12,7 @@ import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
 import type { DbUserDeleteJobData } from '../types.js';
+import { SearchService } from "@/core/SearchService.js";
 
 @Injectable()
 export class DeleteAccountProcessorService {
@@ -36,6 +37,7 @@ export class DeleteAccountProcessorService {
 		private driveService: DriveService,
 		private emailService: EmailService,
 		private queueLoggerService: QueueLoggerService,
+		private searchService: SearchService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('delete-account');
 	}
@@ -71,6 +73,10 @@ export class DeleteAccountProcessorService {
 				cursor = notes[notes.length - 1].id;
 
 				await this.notesRepository.delete(notes.map(note => note.id));
+
+				for (const note of notes) {
+					await this.searchService.unindexNote(note);
+				}
 			}
 
 			this.logger.succ('All of notes deleted');