perf(server): refactor and performance improvements

packages/backend/src/services/user-cache.ts

@@ -0,0 +1,44 @@
+import { CacheableLocalUser, CacheableUser, ILocalUser, User } from '@/models/entities/user.js';
+import { Users } from '@/models/index.js';
+import { Cache } from '@/misc/cache.js';
+import { subsdcriber } from '@/db/redis.js';
+
+export const userByIdCache = new Cache<CacheableUser>(Infinity);
+export const localUserByNativeTokenCache = new Cache<CacheableLocalUser | null>(Infinity);
+export const localUserByIdCache = new Cache<CacheableLocalUser>(Infinity);
+export const uriPersonCache = new Cache<CacheableUser | null>(Infinity);
+
+subsdcriber.on('message', async (_, data) => {
+	const obj = JSON.parse(data);
+
+	if (obj.channel === 'internal') {
+		const { type, body } = obj.message;
+		switch (type) {
+			case 'userChangeSuspendedState':
+			case 'userChangeSilencedState':
+			case 'userChangeModeratorState':
+			case 'remoteUserUpdated': {
+				const user = await Users.findOneOrFail(body.id);
+				userByIdCache.set(user.id, user);
+				for (const [k, v] of uriPersonCache.cache.entries()) {
+					if (v.value?.id === user.id) {
+						uriPersonCache.set(k, user);
+					}
+				}
+				if (Users.isLocalUser(user)) {
+					localUserByNativeTokenCache.set(user.token, user);
+					localUserByIdCache.set(user.id, user);
+				}
+				break;
+			}
+			case 'userTokenRegenerated': {
+				const user = await Users.findOneOrFail(body.id) as ILocalUser;
+				localUserByNativeTokenCache.delete(body.oldToken);
+				localUserByNativeTokenCache.set(body.newToken, user);
+				break;
+			}
+			default:
+				break;
+		}
+	}
+});