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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
import Redis from 'ioredis';
import { DI } from '@/di-symbols.js';
import type { ChannelFollowingsRepository, ChannelsRepository, MiUser } from '@/models/_.js';
import { MiChannel } from '@/models/_.js';
import { IdService } from '@/core/IdService.js';
import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
import { bindThis } from '@/decorators.js';
import type { MiLocalUser } from '@/models/User.js';
import { RedisKVCache } from '@/misc/cache.js';
@Injectable()
export class ChannelFollowingService implements OnModuleInit {
public userFollowingChannelsCache: RedisKVCache<Set<string>>;
constructor(
@Inject(DI.redis)
private redisClient: Redis.Redis,
@Inject(DI.redisForSub)
private redisForSub: Redis.Redis,
@Inject(DI.channelsRepository)
private channelsRepository: ChannelsRepository,
@Inject(DI.channelFollowingsRepository)
private channelFollowingsRepository: ChannelFollowingsRepository,
private idService: IdService,
private globalEventService: GlobalEventService,
) {
this.userFollowingChannelsCache = new RedisKVCache<Set<string>>(this.redisClient, 'userFollowingChannels', {
lifetime: 1000 * 60 * 30, // 30m
memoryCacheLifetime: 1000 * 60, // 1m
fetcher: (key) => this.channelFollowingsRepository.find({
where: { followerId: key },
select: ['followeeId'],
}).then(xs => new Set(xs.map(x => x.followeeId))),
toRedisConverter: (value) => JSON.stringify(Array.from(value)),
fromRedisConverter: (value) => new Set(JSON.parse(value)),
});
this.redisForSub.on('message', this.onMessage);
}
onModuleInit() {
}
/**
* フォローしているチャンネルの一覧を取得する.
* @param params
* @param [opts]
* @param {(boolean|undefined)} [opts.idOnly=false] チャンネルIDのみを取得するかどうか. ID以外のフィールドに値がセットされなくなり、他テーブルとのJOINも一切されなくなるので注意.
* @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルオーナーのユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
* @param {(boolean|undefined)} [opts.joinBannerFile=undefined] バナー画像のドライブファイルをJOINするかどうか(falseまたは省略時はJOINしない).
*/
@bindThis
public async list(
params: {
requestUserId: MiUser['id'],
},
opts?: {
idOnly?: boolean;
joinUser?: boolean;
joinBannerFile?: boolean;
},
): Promise<MiChannel[]> {
if (opts?.idOnly) {
const q = this.channelFollowingsRepository.createQueryBuilder('channel_following')
.select('channel_following.followeeId')
.where('channel_following.followerId = :userId', { userId: params.requestUserId });
return q
.getRawMany<{ channel_following_followeeId: string }>()
.then(xs => xs.map(x => ({ id: x.channel_following_followeeId } as MiChannel)));
} else {
const q = this.channelsRepository.createQueryBuilder('channel')
.innerJoin('channel_following', 'channel_following', 'channel_following.followeeId = channel.id')
.where('channel_following.followerId = :userId', { userId: params.requestUserId });
if (opts?.joinUser) {
q.innerJoinAndSelect('channel.user', 'user');
}
if (opts?.joinBannerFile) {
q.leftJoinAndSelect('channel.banner', 'drive_file');
}
return q.getMany();
}
}
@bindThis
public async follow(
requestUser: MiLocalUser,
targetChannel: MiChannel,
): Promise<void> {
await this.channelFollowingsRepository.insert({
id: this.idService.gen(),
followerId: requestUser.id,
followeeId: targetChannel.id,
});
this.globalEventService.publishInternalEvent('followChannel', {
userId: requestUser.id,
channelId: targetChannel.id,
});
}
@bindThis
public async unfollow(
requestUser: MiLocalUser,
targetChannel: MiChannel,
): Promise<void> {
await this.channelFollowingsRepository.delete({
followerId: requestUser.id,
followeeId: targetChannel.id,
});
this.globalEventService.publishInternalEvent('unfollowChannel', {
userId: requestUser.id,
channelId: targetChannel.id,
});
}
@bindThis
private async onMessage(_: string, data: string): Promise<void> {
const obj = JSON.parse(data);
if (obj.channel === 'internal') {
const { type, body } = obj.message as GlobalEvents['internal']['payload'];
switch (type) {
case 'followChannel': {
this.userFollowingChannelsCache.refresh(body.userId);
break;
}
case 'unfollowChannel': {
this.userFollowingChannelsCache.delete(body.userId);
break;
}
}
}
}
@bindThis
public dispose(): void {
this.userFollowingChannelsCache.dispose();
}
@bindThis
public onApplicationShutdown(signal?: string | undefined): void {
this.dispose();
}
}
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