fix

packages/backend/src/core/UserKeypairService.ts

@@ -0,0 +1,34 @@
+import { Inject, Injectable } from '@nestjs/common';
+import Redis from 'ioredis';
+import type { User } from '@/models/entities/User.js';
+import type { UserKeypairsRepository } from '@/models/index.js';
+import { RedisKVCache } from '@/misc/cache.js';
+import type { UserKeypair } from '@/models/entities/UserKeypair.js';
+import { DI } from '@/di-symbols.js';
+import { bindThis } from '@/decorators.js';
+
+@Injectable()
+export class UserKeypairService {
+	private cache: RedisKVCache<UserKeypair>;
+
+	constructor(
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
+		@Inject(DI.userKeypairsRepository)
+		private userKeypairsRepository: UserKeypairsRepository,
+	) {
+		this.cache = new RedisKVCache<UserKeypair>(this.redisClient, 'userKeypair', {
+			lifetime: 1000 * 60 * 60 * 24, // 24h
+			memoryCacheLifetime: Infinity,
+			fetcher: (key) => this.userKeypairsRepository.findOneByOrFail({ userId: key }),
+			toRedisConverter: (value) => JSON.stringify(value),
+			fromRedisConverter: (value) => JSON.parse(value),
+		});
+	}
+
+	@bindThis
+	public async getUserKeypair(userId: User['id']): Promise<UserKeypair> {
+		return await this.cache.fetch(userId);
+	}
+}