From ecaf152b4a6eb702375debaef0dddc2cca798116 Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Tue, 4 Apr 2023 17:32:09 +0900
Subject: enhance(backend): improve cache

---
 packages/backend/src/core/CacheService.ts | 95 +++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 packages/backend/src/core/CacheService.ts

(limited to 'packages/backend/src/core/CacheService.ts')

diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
new file mode 100644
index 0000000000..887baeb2c2
--- /dev/null
+++ b/packages/backend/src/core/CacheService.ts
@@ -0,0 +1,95 @@
+import { Inject, Injectable } from '@nestjs/common';
+import Redis from 'ioredis';
+import type { UserProfile, UsersRepository } from '@/models/index.js';
+import { MemoryKVCache, RedisKVCache } from '@/misc/cache.js';
+import type { LocalUser, 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 CacheService implements OnApplicationShutdown {
+	public userByIdCache: MemoryKVCache<User>;
+	public localUserByNativeTokenCache: MemoryKVCache<LocalUser | null>;
+	public localUserByIdCache: MemoryKVCache<LocalUser>;
+	public uriPersonCache: MemoryKVCache<User | null>;
+	public userProfileCache: RedisKVCache<UserProfile>;
+	public userMutingsCache: RedisKVCache<string[]>;
+
+	constructor(
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
+		@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 MemoryKVCache<User>(Infinity);
+		this.localUserByNativeTokenCache = new MemoryKVCache<LocalUser | null>(Infinity);
+		this.localUserByIdCache = new MemoryKVCache<LocalUser>(Infinity);
+		this.uriPersonCache = new MemoryKVCache<User | null>(Infinity);
+		this.userProfileCache = new RedisKVCache<UserProfile>(this.redisClient, 'userProfile', 1000 * 60 * 60 * 24, 1000 * 60);
+		this.userMutingsCache = new RedisKVCache<string[]>(this.redisClient, 'userMutings', 1000 * 60 * 60 * 24, 1000 * 60);
+
+		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 LocalUser;
+					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 findUserById(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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