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import { Inject, Injectable } from '@nestjs/common';
import Redis from 'ioredis';
import type { UsersRepository } from '@/models/index.js';
import { Cache } from '@/misc/cache.js';
import type { CacheableLocalUser, CacheableUser, ILocalUser, User } from '@/models/entities/User.js';
import { DI } from '@/di-symbols.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import { bindThis } from '@/decorators.js';
import { StreamMessages } from '@/server/api/stream/types.js';
import type { OnApplicationShutdown } from '@nestjs/common';
@Injectable()
export class UserCacheService implements OnApplicationShutdown {
public userByIdCache: Cache<CacheableUser>;
public localUserByNativeTokenCache: Cache<CacheableLocalUser | null>;
public localUserByIdCache: Cache<CacheableLocalUser>;
public uriPersonCache: Cache<CacheableUser | null>;
constructor(
@Inject(DI.redisSubscriber)
private redisSubscriber: Redis.Redis,
@Inject(DI.usersRepository)
private usersRepository: UsersRepository,
private userEntityService: UserEntityService,
) {
//this.onMessage = this.onMessage.bind(this);
this.userByIdCache = new Cache<CacheableUser>(Infinity);
this.localUserByNativeTokenCache = new Cache<CacheableLocalUser | null>(Infinity);
this.localUserByIdCache = new Cache<CacheableLocalUser>(Infinity);
this.uriPersonCache = new Cache<CacheableUser | null>(Infinity);
this.redisSubscriber.on('message', this.onMessage);
}
@bindThis
private async onMessage(_: string, data: string): Promise<void> {
const obj = JSON.parse(data);
if (obj.channel === 'internal') {
const { type, body } = obj.message as StreamMessages['internal']['payload'];
switch (type) {
case 'userChangeSuspendedState':
case 'remoteUserUpdated': {
const user = await this.usersRepository.findOneByOrFail({ id: body.id });
this.userByIdCache.set(user.id, user);
for (const [k, v] of this.uriPersonCache.cache.entries()) {
if (v.value?.id === user.id) {
this.uriPersonCache.set(k, user);
}
}
if (this.userEntityService.isLocalUser(user)) {
this.localUserByNativeTokenCache.set(user.token, user);
this.localUserByIdCache.set(user.id, user);
}
break;
}
case 'userTokenRegenerated': {
const user = await this.usersRepository.findOneByOrFail({ id: body.id }) as ILocalUser;
this.localUserByNativeTokenCache.delete(body.oldToken);
this.localUserByNativeTokenCache.set(body.newToken, user);
break;
}
case 'follow': {
const follower = this.userByIdCache.get(body.followerId);
if (follower) follower.followingCount++;
const followee = this.userByIdCache.get(body.followeeId);
if (followee) followee.followersCount++;
break;
}
default:
break;
}
}
}
@bindThis
public findById(userId: User['id']) {
return this.userByIdCache.fetch(userId, () => this.usersRepository.findOneByOrFail({ id: userId }));
}
@bindThis
public onApplicationShutdown(signal?: string | undefined) {
this.redisSubscriber.off('message', this.onMessage);
}
}
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