687 أسطر
22 KiB
TypeScript
687 أسطر
22 KiB
TypeScript
import { Injectable, Logger, NotFoundException } from '@nestjs/common';
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import { ConfigService } from '@nestjs/config';
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import { Types } from 'mongoose';
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import { performance } from 'perf_hooks';
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import { PostType } from '../../common/enums/post-type.enum';
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import { PostVisibility } from '../../common/enums/post-visibility.enum';
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import { decodeOffsetCursor, encodeOffsetCursor } from '../../common/utils/cursor.util';
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import { buildPaginatedResponse } from '../../common/utils/pagination.util';
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import { AppCacheService } from '../../infrastructure/cache/app-cache.service';
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import { FeedVersionService } from '../../infrastructure/cache/feed-version.service';
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import { BlocksService } from '../blocks/blocks.service';
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import { FollowsService } from '../follows/follows.service';
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import { LikesRepository } from '../likes/likes.repository';
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import { MarketplaceService } from '../marketplace/marketplace.service';
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import { SavesRepository } from '../saves/saves.repository';
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import { UserDocument } from '../users/schemas/user.schema';
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import { UsersRepository } from '../users/users.repository';
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import { FeedQueryDto } from './dto/feed-query.dto';
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import { FeedRepository } from './feed.repository';
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type FeedPostItem = Record<string, unknown> & {
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feedItemType: 'post';
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feedScore?: number;
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likedByMe: boolean;
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savedByMe: boolean;
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followingAuthor: boolean;
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isOwnPost: boolean;
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canComment: boolean;
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canMessage: boolean;
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engagement: {
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likesCount: number;
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commentsCount: number;
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savesCount: number;
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shareCount: number;
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viewCount: number;
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playCount: number;
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};
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};
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type FeedCardItem =
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| {
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id: string;
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feedItemType: 'suggested_users';
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title: string;
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subtitle: string;
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items: Array<Record<string, unknown>>;
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}
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| {
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id: string;
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feedItemType: 'featured_marketplace';
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title: string;
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subtitle: string;
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listings: Array<Record<string, unknown>>;
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musicalInstruments: Array<Record<string, unknown>>;
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instruments: Array<Record<string, unknown>>;
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repairShops: Array<Record<string, unknown>>;
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};
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@Injectable()
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export class FeedService {
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private readonly logger = new Logger(FeedService.name);
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constructor(
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private readonly feedRepository: FeedRepository,
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private readonly usersRepository: UsersRepository,
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private readonly cacheService: AppCacheService,
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private readonly feedVersionService: FeedVersionService,
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private readonly configService: ConfigService,
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private readonly likesRepository: LikesRepository,
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private readonly savesRepository: SavesRepository,
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private readonly followsService: FollowsService,
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private readonly marketplaceService: MarketplaceService,
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private readonly blocksService: BlocksService,
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) {}
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async getMyFeed(currentUserId: string, query: FeedQueryDto) {
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const timing = this.startTiming('feed.me');
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const followingOnly = query.followingOnly ?? true;
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const cacheEnabled =
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this.configService.get<boolean>('feedCache.enabled', { infer: true }) ?? true;
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const globalVersion = cacheEnabled ? await this.feedVersionService.getGlobalVersion() : 0;
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const includeSuggestions = this.shouldIncludeSuggestions(query);
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const cacheKey = this.buildCacheKey('me', {
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currentUserId,
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globalVersion,
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page: query.page ?? 1,
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limit: query.limit ?? 20,
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cursor: query.cursor ?? '',
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followingOnly,
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radiusKm: query.radiusKm ?? 30,
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preferredPostType: query.preferredPostType ?? '',
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includeSuggestions,
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suggestionInterval: query.suggestionInterval ?? 4,
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});
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if (cacheEnabled) {
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const cached = await this.cacheService.get<Record<string, unknown>>(cacheKey);
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if (cached) {
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this.logFeedTiming(timing, {
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cacheHit: true,
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itemCount: Array.isArray(cached.items) ? cached.items.length : undefined,
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nextCursor: cached.nextCursor ?? null,
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responseBytes: this.measureResponseBytes(cached),
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});
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return cached;
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}
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}
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const currentUser = await this.usersRepository.findById(currentUserId);
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if (!currentUser) {
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throw new NotFoundException('Current user not found');
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}
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const limit = query.limit ?? 20;
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const cursorOffset = decodeOffsetCursor(query.cursor);
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const page = query.page ?? 1;
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const radiusKm = query.radiusKm ?? 30;
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const skip = cursorOffset ?? (page - 1) * limit;
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const [followingIds, invisibleUserIds] = await Promise.all([
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this.feedRepository.findFollowingIds(currentUserId),
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this.blocksService.getInvisibleUserIds(currentUserId),
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]);
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const relationLookupMs = this.markTiming(timing);
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let filter = this.buildVisiblePostsFilter(currentUserId, followingIds, followingOnly, invisibleUserIds);
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let candidates = await this.feedRepository.findCandidatePosts(filter, Math.max(limit * 12, 300));
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const firstCandidateLookupMs = this.markTiming(timing);
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// Keep the default home feed focused on followed accounts, but avoid an empty screen
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// for new users or when followed accounts have not posted yet.
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if (
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candidates.length === 0 &&
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typeof query.followingOnly === 'undefined' &&
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followingOnly
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) {
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filter = this.buildVisiblePostsFilter(currentUserId, followingIds, false, invisibleUserIds);
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candidates = await this.feedRepository.findCandidatePosts(filter, Math.max(limit * 12, 300));
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}
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const fallbackCandidateLookupMs = this.markTiming(timing);
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const scored = candidates
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.filter((post) => {
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if (!query.preferredPostType) {
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return true;
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}
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return post.postType === query.preferredPostType;
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})
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.map((post) => ({
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post,
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score: this.scorePost({
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currentUser,
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currentUserId,
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followingIds,
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post,
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preferredPostType: query.preferredPostType,
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radiusKm,
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}),
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}))
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.sort(
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(a, b) =>
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b.score - a.score ||
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new Date((b.post as any).createdAt ?? 0).getTime() -
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new Date((a.post as any).createdAt ?? 0).getTime(),
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);
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const scoringMs = this.markTiming(timing);
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const total = scored.length;
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const pagedPosts = scored.slice(skip, skip + limit).map((entry) => ({
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...(entry.post.toObject() as unknown as Record<string, unknown>),
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feedScore: Number(entry.score.toFixed(3)),
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}));
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const decoratedPosts = await this.decoratePostsForViewer(currentUserId, pagedPosts, followingIds);
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const decorationMs = this.markTiming(timing);
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const items = includeSuggestions
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? await this.mixHomeFeedItems(currentUserId, decoratedPosts, query.suggestionInterval ?? 4)
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: decoratedPosts;
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const cardsMs = this.markTiming(timing);
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const nextOffset = skip + pagedPosts.length;
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const nextCursor = nextOffset < total ? encodeOffsetCursor(nextOffset) : null;
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const result = buildPaginatedResponse(items, {
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page,
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limit,
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total,
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offset: skip,
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currentCursor: query.cursor ?? null,
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nextCursor,
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mode: 'cursor',
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});
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if (cacheEnabled) {
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await this.cacheService.set(
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cacheKey,
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result,
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this.configService.get<number>('feedCache.userFeedTtlSeconds', { infer: true }) ?? 15,
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);
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}
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this.logFeedTiming(timing, {
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cacheHit: false,
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page,
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limit,
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skip,
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followingOnly,
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includeSuggestions,
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followingCount: followingIds.length,
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invisibleUserCount: invisibleUserIds.length,
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candidateCount: candidates.length,
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scoredCount: scored.length,
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itemCount: items.length,
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postItemCount: decoratedPosts.length,
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nextCursor,
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relationLookupMs,
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firstCandidateLookupMs,
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fallbackCandidateLookupMs,
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scoringMs,
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decorationMs,
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cardsMs,
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responseBytes: this.measureResponseBytes(result),
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});
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return result;
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}
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async getExplore(currentUserId: string, query: FeedQueryDto) {
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return this.getTrending(currentUserId, {
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...query,
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followingOnly: false,
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includeSuggestions: false,
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});
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}
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async getTrending(currentUserId: string, query: FeedQueryDto) {
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const timing = this.startTiming('feed.trending');
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const cacheEnabled =
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this.configService.get<boolean>('feedCache.enabled', { infer: true }) ?? true;
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const globalVersion = cacheEnabled ? await this.feedVersionService.getGlobalVersion() : 0;
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const cacheKey = this.buildCacheKey('trending', {
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currentUserId,
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globalVersion,
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page: query.page ?? 1,
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limit: query.limit ?? 20,
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cursor: query.cursor ?? '',
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preferredPostType: query.preferredPostType ?? '',
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});
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if (cacheEnabled) {
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const cached = await this.cacheService.get<Record<string, unknown>>(cacheKey);
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if (cached) {
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this.logFeedTiming(timing, {
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cacheHit: true,
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itemCount: Array.isArray(cached.items) ? cached.items.length : undefined,
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nextCursor: cached.nextCursor ?? null,
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responseBytes: this.measureResponseBytes(cached),
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});
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return cached;
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}
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}
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const limit = query.limit ?? 20;
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const cursorOffset = decodeOffsetCursor(query.cursor);
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const page = query.page ?? 1;
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const skip = cursorOffset ?? (page - 1) * limit;
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const [followingIds, invisibleUserIds] = await Promise.all([
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this.feedRepository.findFollowingIds(currentUserId),
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this.blocksService.getInvisibleUserIds(currentUserId),
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]);
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const relationLookupMs = this.markTiming(timing);
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const trendingFilter: Record<string, unknown> = { visibility: PostVisibility.PUBLIC };
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if (invisibleUserIds.length) {
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trendingFilter.authorId = { $nin: invisibleUserIds.map((id) => new Types.ObjectId(id)) };
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}
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if (query.preferredPostType) {
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trendingFilter.postType = query.preferredPostType;
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}
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const [rows, total] = await Promise.all([
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this.feedRepository.findTrendingPublicPosts(trendingFilter, skip, limit),
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this.feedRepository.count(trendingFilter),
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]);
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const postLookupMs = this.markTiming(timing);
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const decoratedPosts = await this.decoratePostsForViewer(
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currentUserId,
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rows.map((item) => item.toObject() as unknown as Record<string, unknown>),
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followingIds,
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);
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const decorationMs = this.markTiming(timing);
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const nextOffset = skip + rows.length;
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const nextCursor = nextOffset < total ? encodeOffsetCursor(nextOffset) : null;
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const result = buildPaginatedResponse(decoratedPosts, {
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page,
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limit,
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total,
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offset: skip,
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currentCursor: query.cursor ?? null,
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nextCursor,
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mode: 'cursor',
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});
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if (cacheEnabled) {
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await this.cacheService.set(
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cacheKey,
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result,
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this.configService.get<number>('feedCache.trendingTtlSeconds', { infer: true }) ?? 30,
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);
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}
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this.logFeedTiming(timing, {
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cacheHit: false,
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page,
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limit,
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skip,
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preferredPostType: query.preferredPostType ?? '',
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followingCount: followingIds.length,
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invisibleUserCount: invisibleUserIds.length,
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itemCount: decoratedPosts.length,
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total,
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nextCursor,
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relationLookupMs,
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postLookupMs,
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decorationMs,
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responseBytes: this.measureResponseBytes(result),
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});
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return result;
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}
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private async decoratePostsForViewer(
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currentUserId: string,
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items: Array<Record<string, unknown>>,
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followingIds: string[],
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): Promise<FeedPostItem[]> {
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const postIds = items
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.map((item) => this.extractEntityId(item._id ?? item.id))
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.filter(Boolean);
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const followingSet = new Set(followingIds);
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const [likedPostIds, savedPostIds] = await Promise.all([
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this.likesRepository.findLikedPostIds(currentUserId, postIds),
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this.savesRepository.findSavedPostIds(currentUserId, postIds),
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]);
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const likedSet = new Set(likedPostIds);
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const savedSet = new Set(savedPostIds);
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return items.map((item) => {
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const postId = this.extractEntityId(item._id ?? item.id);
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const authorId = this.extractEntityId(item.authorId);
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const likesCount = Number(item.likesCount ?? 0);
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const commentsCount = Number(item.commentsCount ?? 0);
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const savesCount = Number(item.savesCount ?? 0);
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const shareCount = Number(item.shareCount ?? 0);
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const viewCount = Number(item.viewCount ?? 0);
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const playCount = Number(item.playCount ?? 0);
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return {
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...item,
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id: postId,
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feedItemType: 'post',
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likedByMe: likedSet.has(postId),
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savedByMe: savedSet.has(postId),
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followingAuthor: !!authorId && followingSet.has(authorId),
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isOwnPost: authorId === currentUserId,
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canComment: true,
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canMessage: !!authorId && authorId !== currentUserId,
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engagement: {
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likesCount,
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commentsCount,
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savesCount,
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shareCount,
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viewCount,
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playCount,
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},
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};
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});
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}
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private async mixHomeFeedItems(
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currentUserId: string,
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posts: FeedPostItem[],
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suggestionInterval: number,
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): Promise<Array<FeedPostItem | FeedCardItem>> {
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const cards = await this.buildHomeCards(currentUserId);
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if (!cards.length) {
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return posts;
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}
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const result: Array<FeedPostItem | FeedCardItem> = [];
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let cardIndex = 0;
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for (let index = 0; index < posts.length; index += 1) {
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result.push(posts[index]);
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if ((index + 1) % suggestionInterval === 0 && cardIndex < cards.length) {
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result.push(cards[cardIndex]);
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cardIndex += 1;
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}
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}
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while (cardIndex < cards.length) {
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result.push(cards[cardIndex]);
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cardIndex += 1;
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}
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return result;
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}
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private async buildHomeCards(currentUserId: string): Promise<FeedCardItem[]> {
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const [suggestions, listings, instruments, repairShops] = await Promise.all([
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this.followsService.getSuggestions(currentUserId, {
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page: 1,
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limit: 5,
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}),
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this.marketplaceService.getPublicListings({
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page: 1,
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limit: 3,
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isActive: true,
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} as any),
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this.marketplaceService.getPublicInstruments({
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page: 1,
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limit: 3,
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isActive: true,
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} as any),
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this.marketplaceService.getPublicRepairShops({
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page: 1,
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limit: 2,
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isActive: true,
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} as any),
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]);
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const cards: FeedCardItem[] = [];
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if (Array.isArray(suggestions.items) && suggestions.items.length > 0) {
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cards.push({
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id: `suggested-users:${currentUserId}`,
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feedItemType: 'suggested_users',
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title: 'Suggested creators',
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subtitle: 'People you may want to follow',
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items: suggestions.items.map((entry) => ({
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...entry,
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following: false,
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})),
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});
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}
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if (
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(listings.items?.length ?? 0) > 0 ||
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(instruments.items?.length ?? 0) > 0 ||
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(repairShops.items?.length ?? 0) > 0
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) {
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cards.push({
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id: `featured-marketplace:${currentUserId}`,
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feedItemType: 'featured_marketplace',
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title: 'Explore marketplace',
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subtitle: 'Featured listings, musical instruments, and repair shops',
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listings: (listings.items ?? []) as unknown as Array<Record<string, unknown>>,
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musicalInstruments: (instruments.items ?? []) as unknown as Array<Record<string, unknown>>,
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instruments: (instruments.items ?? []) as unknown as Array<Record<string, unknown>>,
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repairShops: (repairShops.items ?? []) as unknown as Array<Record<string, unknown>>,
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});
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}
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return cards;
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}
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private buildVisiblePostsFilter(
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currentUserId: string,
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followingIds: string[],
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followingOnly: boolean,
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invisibleUserIds: string[] = [],
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): Record<string, unknown> {
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const currentUserObjectId = new Types.ObjectId(currentUserId);
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const followingObjectIds = followingIds.map((id) => new Types.ObjectId(id));
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const visibilityFilter = followingOnly
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? {
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$or: [
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{ authorId: currentUserObjectId },
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{
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authorId: { $in: followingObjectIds },
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visibility: { $in: [PostVisibility.PUBLIC, PostVisibility.FOLLOWERS] },
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},
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],
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}
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: {
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$or: [
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{ visibility: PostVisibility.PUBLIC },
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{ authorId: currentUserObjectId },
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{
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authorId: { $in: followingObjectIds },
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visibility: PostVisibility.FOLLOWERS,
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},
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],
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};
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if (!invisibleUserIds.length) {
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return visibilityFilter;
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}
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return {
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$and: [
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visibilityFilter,
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{ authorId: { $nin: invisibleUserIds.map((id) => new Types.ObjectId(id)) } },
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],
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};
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}
|
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private scorePost(input: {
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currentUser: UserDocument;
|
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currentUserId: string;
|
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followingIds: string[];
|
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post: Record<string, any>;
|
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preferredPostType?: PostType;
|
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radiusKm: number;
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}): number {
|
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const { currentUser, currentUserId, followingIds, post, preferredPostType, radiusKm } = input;
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const author = post.authorId;
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const authorId = this.extractEntityId(author);
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const isOwnPost = authorId === currentUserId;
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const isFollowing = followingIds.includes(authorId);
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const ageMs = Date.now() - new Date(post.createdAt).getTime();
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const ageHours = ageMs / (1000 * 60 * 60);
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const freshness = Math.max(0, 36 - ageHours);
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|
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const engagement =
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Number(post.likesCount ?? 0) * 3 +
|
|
Number(post.commentsCount ?? 0) * 4 +
|
|
Number(post.savesCount ?? 0) * 5 +
|
|
Number(post.shareCount ?? 0) * 6 +
|
|
Number(post.viewCount ?? 0) * 0.15 +
|
|
Number(post.playCount ?? 0) * 0.25;
|
|
const hashtagMatches = this.intersectionCount(
|
|
this.buildPreferenceTokens(currentUser),
|
|
(post.hashtags ?? []).map((value: string) => value.toLowerCase()),
|
|
);
|
|
|
|
const distanceKm = this.computeDistanceKm(
|
|
currentUser.latitude,
|
|
currentUser.longitude,
|
|
author?.latitude ?? null,
|
|
author?.longitude ?? null,
|
|
);
|
|
const nearbyBoost =
|
|
typeof distanceKm === 'number' && distanceKm <= radiusKm ? Math.max(0, 25 - distanceKm / 2) : 0;
|
|
|
|
let score = 0;
|
|
score += engagement;
|
|
score += freshness;
|
|
score += isOwnPost ? 10 : 0;
|
|
score += isFollowing ? 40 : 0;
|
|
score += post.postType === preferredPostType ? 18 : 0;
|
|
score += hashtagMatches * 9;
|
|
score += nearbyBoost;
|
|
score += author?.isVerified ? 8 : 0;
|
|
score += Math.min(20, Math.floor((author?.followersCount ?? 0) / 200));
|
|
|
|
return score;
|
|
}
|
|
|
|
private buildPreferenceTokens(user: UserDocument): string[] {
|
|
const tokens = [
|
|
...(user.musicGenres ?? []),
|
|
...(user.favoriteInstruments ?? []),
|
|
...(user.favoriteMaqamat ?? []),
|
|
...(user.musicRoles ?? []),
|
|
]
|
|
.map((item) => item.trim().toLowerCase())
|
|
.filter(Boolean);
|
|
|
|
return Array.from(new Set(tokens));
|
|
}
|
|
|
|
private intersectionCount(a: string[], b: string[]): number {
|
|
if (!a.length || !b.length) {
|
|
return 0;
|
|
}
|
|
|
|
const right = new Set(b);
|
|
let count = 0;
|
|
for (const item of a) {
|
|
if (right.has(item)) {
|
|
count += 1;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
private computeDistanceKm(
|
|
lat1: number | null | undefined,
|
|
lon1: number | null | undefined,
|
|
lat2: number | null | undefined,
|
|
lon2: number | null | undefined,
|
|
): number | null {
|
|
if (
|
|
typeof lat1 !== 'number' ||
|
|
typeof lon1 !== 'number' ||
|
|
typeof lat2 !== 'number' ||
|
|
typeof lon2 !== 'number'
|
|
) {
|
|
return null;
|
|
}
|
|
|
|
const toRad = (deg: number) => (deg * Math.PI) / 180;
|
|
const earthKm = 6371;
|
|
const dLat = toRad(lat2 - lat1);
|
|
const dLon = toRad(lon2 - lon1);
|
|
const a =
|
|
Math.sin(dLat / 2) ** 2 +
|
|
Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLon / 2) ** 2;
|
|
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
|
|
return earthKm * c;
|
|
}
|
|
|
|
private buildCacheKey(scope: string, input: Record<string, unknown>): string {
|
|
return `feed:${scope}:${JSON.stringify(input)}`;
|
|
}
|
|
|
|
private shouldIncludeSuggestions(query: FeedQueryDto): boolean {
|
|
return (
|
|
query.includeSuggestions === true &&
|
|
!(query.cursor ?? '').trim() &&
|
|
(query.page ?? 1) === 1
|
|
);
|
|
}
|
|
|
|
private extractEntityId(value: unknown): string {
|
|
if (!value) {
|
|
return '';
|
|
}
|
|
|
|
if (typeof value === 'string') {
|
|
return value;
|
|
}
|
|
|
|
if (value instanceof Types.ObjectId) {
|
|
return value.toString();
|
|
}
|
|
|
|
if (typeof value === 'object') {
|
|
const candidate = value as { _id?: unknown; id?: unknown };
|
|
if (candidate._id instanceof Types.ObjectId) {
|
|
return candidate._id.toString();
|
|
}
|
|
if (typeof candidate._id === 'string') {
|
|
return candidate._id;
|
|
}
|
|
if (typeof candidate.id === 'string') {
|
|
return candidate.id;
|
|
}
|
|
}
|
|
|
|
return '';
|
|
}
|
|
|
|
private startTiming(scope: string): { scope: string; startedAt: number; lastAt: number } {
|
|
const now = performance.now();
|
|
return { scope, startedAt: now, lastAt: now };
|
|
}
|
|
|
|
private markTiming(timing: { lastAt: number }): number {
|
|
const now = performance.now();
|
|
const elapsed = now - timing.lastAt;
|
|
timing.lastAt = now;
|
|
return Math.round(elapsed);
|
|
}
|
|
|
|
private logFeedTiming(
|
|
timing: { scope: string; startedAt: number },
|
|
details: Record<string, unknown>,
|
|
): void {
|
|
if (!this.configService.get<boolean>('performance.feedTimingLogsEnabled', { infer: true })) {
|
|
return;
|
|
}
|
|
|
|
this.logger.log({
|
|
event: 'feed_timing',
|
|
scope: timing.scope,
|
|
totalMs: Math.round(performance.now() - timing.startedAt),
|
|
...details,
|
|
});
|
|
}
|
|
|
|
private measureResponseBytes(value: unknown): number {
|
|
try {
|
|
return Buffer.byteLength(JSON.stringify(value), 'utf8');
|
|
} catch {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|