merge: Remove infinite caches to prevent memory leak (!587)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/587

Closes #600 and #601

Approved-by: Amelia Yukii <amelia.yukii@shourai.de>
Approved-by: Marie <marie@kaifa.ch>

packages/backend/src/core/AvatarDecorationService.ts

@@ -29,7 +29,7 @@ export class AvatarDecorationService implements OnApplicationShutdown {
 		private moderationLogService: ModerationLogService,
 		private globalEventService: GlobalEventService,
 	) {
-		this.cache = new MemorySingleCache<MiAvatarDecoration[]>(1000 * 60 * 30);
+		this.cache = new MemorySingleCache<MiAvatarDecoration[]>(1000 * 60 * 30); // 30s
 
 		this.redisForSub.on('message', this.onMessage);
 	}

packages/backend/src/core/CacheService.ts

@@ -56,10 +56,10 @@ export class CacheService implements OnApplicationShutdown {
 	) {
 		//this.onMessage = this.onMessage.bind(this);
 
-		this.userByIdCache = new MemoryKVCache<MiUser>(Infinity);
+		this.userByIdCache = new MemoryKVCache<MiUser>(1000 * 60 * 5); // 5m
-		this.localUserByNativeTokenCache = new MemoryKVCache<MiLocalUser | null>(Infinity);
+		this.localUserByNativeTokenCache = new MemoryKVCache<MiLocalUser | null>(1000 * 60 * 5); // 5m
-		this.localUserByIdCache = new MemoryKVCache<MiLocalUser>(Infinity);
+		this.localUserByIdCache = new MemoryKVCache<MiLocalUser>(1000 * 60 * 5); // 5m
-		this.uriPersonCache = new MemoryKVCache<MiUser | null>(Infinity);
+		this.uriPersonCache = new MemoryKVCache<MiUser | null>(1000 * 60 * 5); // 5m
 
 		this.userProfileCache = new RedisKVCache<MiUserProfile>(this.redisClient, 'userProfile', {
 			lifetime: 1000 * 60 * 30, // 30m
@@ -135,14 +135,14 @@ export class CacheService implements OnApplicationShutdown {
 					if (user == null) {
 						this.userByIdCache.delete(body.id);
 						this.localUserByIdCache.delete(body.id);
-						for (const [k, v] of this.uriPersonCache.cache.entries()) {
+						for (const [k, v] of this.uriPersonCache.entries) {
 							if (v.value?.id === body.id) {
 								this.uriPersonCache.delete(k);
 							}
 						}
 					} else {
 						this.userByIdCache.set(user.id, user);
-						for (const [k, v] of this.uriPersonCache.cache.entries()) {
+						for (const [k, v] of this.uriPersonCache.entries) {
 							if (v.value?.id === user.id) {
 								this.uriPersonCache.set(k, user);
 							}

packages/backend/src/core/CustomEmojiService.ts

@@ -26,7 +26,7 @@ const parseEmojiStrRegexp = /^([-\w]+)(?:@([\w.-]+))?$/;
 
 @Injectable()
 export class CustomEmojiService implements OnApplicationShutdown {
-	private cache: MemoryKVCache<MiEmoji | null>;
+	private emojisCache: MemoryKVCache<MiEmoji | null>;
 	public localEmojisCache: RedisSingleCache<Map<string, MiEmoji>>;
 
 	constructor(
@@ -49,7 +49,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 		private globalEventService: GlobalEventService,
 		private driveService: DriveService,
 	) {
-		this.cache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12);
+		this.emojisCache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12); // 12h
 
 		this.localEmojisCache = new RedisSingleCache<Map<string, MiEmoji>>(this.redisClient, 'localEmojis', {
 			lifetime: 1000 * 60 * 30, // 30m
@@ -364,7 +364,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 			host: newHost ?? IsNull(),
 		})) ?? null;
 
-		const emoji = await this.cache.fetch(`${name} ${host}`, queryOrNull);
+		const emoji = await this.emojisCache.fetch(`${name} ${host}`, queryOrNull);
 
 		if (emoji == null) return null;
 		return emoji.publicUrl || emoji.originalUrl; // || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
@@ -391,7 +391,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 	 */
 	@bindThis
 	public async prefetchEmojis(emojis: { name: string; host: string | null; }[]): Promise<void> {
-		const notCachedEmojis = emojis.filter(emoji => this.cache.get(`${emoji.name} ${emoji.host}`) == null);
+		const notCachedEmojis = emojis.filter(emoji => this.emojisCache.get(`${emoji.name} ${emoji.host}`) == null);
 		const emojisQuery: any[] = [];
 		const hosts = new Set(notCachedEmojis.map(e => e.host));
 		for (const host of hosts) {
@@ -406,7 +406,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 			select: ['name', 'host', 'originalUrl', 'publicUrl'],
 		}) : [];
 		for (const emoji of _emojis) {
-			this.cache.set(`${emoji.name} ${emoji.host}`, emoji);
+			this.emojisCache.set(`${emoji.name} ${emoji.host}`, emoji);
 		}
 	}
 
@@ -431,7 +431,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 
 	@bindThis
 	public dispose(): void {
-		this.cache.dispose();
+		this.emojisCache.dispose();
 	}
 
 	@bindThis

packages/backend/src/core/RelayService.ts

@@ -35,7 +35,7 @@ export class RelayService {
 		private createSystemUserService: CreateSystemUserService,
 		private apRendererService: ApRendererService,
 	) {
-		this.relaysCache = new MemorySingleCache<MiRelay[]>(1000 * 60 * 10);
+		this.relaysCache = new MemorySingleCache<MiRelay[]>(1000 * 60 * 10); // 10m
 	}
 
 	@bindThis

packages/backend/src/core/RoleService.ts

@@ -129,10 +129,8 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 		private moderationLogService: ModerationLogService,
 		private fanoutTimelineService: FanoutTimelineService,
 	) {
-		//this.onMessage = this.onMessage.bind(this);
+		this.rolesCache = new MemorySingleCache<MiRole[]>(1000 * 60 * 60); // 1h
-
+		this.roleAssignmentByUserIdCache = new MemoryKVCache<MiRoleAssignment[]>(1000 * 60 * 5); // 5m
-		this.rolesCache = new MemorySingleCache<MiRole[]>(1000 * 60 * 60 * 1);
-		this.roleAssignmentByUserIdCache = new MemoryKVCache<MiRoleAssignment[]>(1000 * 60 * 60 * 1);
 
 		this.redisForSub.on('message', this.onMessage);
 	}

packages/backend/src/core/UserKeypairService.ts

@@ -25,7 +25,7 @@ export class UserKeypairService implements OnApplicationShutdown {
 	) {
 		this.cache = new RedisKVCache<MiUserKeypair>(this.redisClient, 'userKeypair', {
 			lifetime: 1000 * 60 * 60 * 24, // 24h
-			memoryCacheLifetime: Infinity,
+			memoryCacheLifetime: 1000 * 60 * 60, // 1h
 			fetcher: (key) => this.userKeypairsRepository.findOneByOrFail({ userId: key }),
 			toRedisConverter: (value) => JSON.stringify(value),
 			fromRedisConverter: (value) => JSON.parse(value),

packages/backend/src/core/activitypub/ApDbResolverService.ts

@@ -54,8 +54,8 @@ export class ApDbResolverService implements OnApplicationShutdown {
 		private cacheService: CacheService,
 		private apPersonService: ApPersonService,
 	) {
-		this.publicKeyCache = new MemoryKVCache<MiUserPublickey | null>(Infinity);
+		this.publicKeyCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
-		this.publicKeyByUserIdCache = new MemoryKVCache<MiUserPublickey | null>(Infinity);
+		this.publicKeyByUserIdCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
 	}
 
 	@bindThis

packages/backend/src/misc/cache.ts

@@ -7,23 +7,23 @@ import * as Redis from 'ioredis';
 import { bindThis } from '@/decorators.js';
 
 export class RedisKVCache<T> {
-	private redisClient: Redis.Redis;
+	private readonly lifetime: number;
-	private name: string;
+	private readonly memoryCache: MemoryKVCache<T>;
-	private lifetime: number;
+	private readonly fetcher: (key: string) => Promise<T>;
-	private memoryCache: MemoryKVCache<T>;
+	private readonly toRedisConverter: (value: T) => string;
-	private fetcher: (key: string) => Promise<T>;
+	private readonly fromRedisConverter: (value: string) => T | undefined;
-	private toRedisConverter: (value: T) => string;
-	private fromRedisConverter: (value: string) => T | undefined;
 
-	constructor(redisClient: RedisKVCache<T>['redisClient'], name: RedisKVCache<T>['name'], opts: {
+	constructor(
+		private redisClient: Redis.Redis,
+		private name: string,
+		opts: {
 			lifetime: RedisKVCache<T>['lifetime'];
 			memoryCacheLifetime: number;
 			fetcher: RedisKVCache<T>['fetcher'];
 			toRedisConverter: RedisKVCache<T>['toRedisConverter'];
 			fromRedisConverter: RedisKVCache<T>['fromRedisConverter'];
-	}) {
+		},
-		this.redisClient = redisClient;
+	) {
-		this.name = name;
 		this.lifetime = opts.lifetime;
 		this.memoryCache = new MemoryKVCache(opts.memoryCacheLifetime);
 		this.fetcher = opts.fetcher;
@@ -55,7 +55,13 @@ export class RedisKVCache<T> {
 
 		const cached = await this.redisClient.get(`kvcache:${this.name}:${key}`);
 		if (cached == null) return undefined;
-		return this.fromRedisConverter(cached);
+
+		const value = this.fromRedisConverter(cached);
+		if (value !== undefined) {
+			this.memoryCache.set(key, value);
+		}
+
+		return value;
 	}
 
 	@bindThis
@@ -77,14 +83,14 @@ export class RedisKVCache<T> {
 
 		// Cache MISS
 		const value = await this.fetcher(key);
-		this.set(key, value);
+		await this.set(key, value);
 		return value;
 	}
 
 	@bindThis
 	public async refresh(key: string) {
 		const value = await this.fetcher(key);
-		this.set(key, value);
+		await this.set(key, value);
 
 		// TODO: イベント発行して他プロセスのメモリキャッシュも更新できるようにする
 	}
@@ -101,23 +107,23 @@ export class RedisKVCache<T> {
 }
 
 export class RedisSingleCache<T> {
-	private redisClient: Redis.Redis;
+	private readonly lifetime: number;
-	private name: string;
+	private readonly memoryCache: MemorySingleCache<T>;
-	private lifetime: number;
+	private readonly fetcher: () => Promise<T>;
-	private memoryCache: MemorySingleCache<T>;
+	private readonly toRedisConverter: (value: T) => string;
-	private fetcher: () => Promise<T>;
+	private readonly fromRedisConverter: (value: string) => T | undefined;
-	private toRedisConverter: (value: T) => string;
-	private fromRedisConverter: (value: string) => T | undefined;
 
-	constructor(redisClient: RedisSingleCache<T>['redisClient'], name: RedisSingleCache<T>['name'], opts: {
+	constructor(
-		lifetime: RedisSingleCache<T>['lifetime'];
+		private redisClient: Redis.Redis,
+		private name: string,
+		opts: {
+			lifetime: number;
 			memoryCacheLifetime: number;
 			fetcher: RedisSingleCache<T>['fetcher'];
 			toRedisConverter: RedisSingleCache<T>['toRedisConverter'];
 			fromRedisConverter: RedisSingleCache<T>['fromRedisConverter'];
-	}) {
+		},
-		this.redisClient = redisClient;
+	) {
-		this.name = name;
 		this.lifetime = opts.lifetime;
 		this.memoryCache = new MemorySingleCache(opts.memoryCacheLifetime);
 		this.fetcher = opts.fetcher;
@@ -149,7 +155,13 @@ export class RedisSingleCache<T> {
 
 		const cached = await this.redisClient.get(`singlecache:${this.name}`);
 		if (cached == null) return undefined;
-		return this.fromRedisConverter(cached);
+
+		const value = this.fromRedisConverter(cached);
+		if (value !== undefined) {
+			this.memoryCache.set(value);
+		}
+
+		return value;
 	}
 
 	@bindThis
@@ -171,14 +183,14 @@ export class RedisSingleCache<T> {
 
 		// Cache MISS
 		const value = await this.fetcher();
-		this.set(value);
+		await this.set(value);
 		return value;
 	}
 
 	@bindThis
 	public async refresh() {
 		const value = await this.fetcher();
-		this.set(value);
+		await this.set(value);
 
 		// TODO: イベント発行して他プロセスのメモリキャッシュも更新できるようにする
 	}
@@ -187,22 +199,12 @@ export class RedisSingleCache<T> {
 // TODO: メモリ節約のためあまり参照されないキーを定期的に削除できるようにする？
 
 export class MemoryKVCache<T> {
-	/**
+	private readonly cache = new Map<string, { date: number; value: T; }>();
-	 * データを持つマップ
+	private readonly gcIntervalHandle = setInterval(() => this.gc(), 1000 * 60 * 3); // 3m
-	 * @deprecated これを直接操作するべきではない
-	 */
-	public cache: Map<string, { date: number; value: T; }>;
-	private lifetime: number;
-	private gcIntervalHandle: NodeJS.Timeout;
 
-	constructor(lifetime: MemoryKVCache<never>['lifetime']) {
+	constructor(
-		this.cache = new Map();
+		private readonly lifetime: number,
-		this.lifetime = lifetime;
+	) {}
-
-		this.gcIntervalHandle = setInterval(() => {
-			this.gc();
-		}, 1000 * 60 * 3);
-	}
 
 	@bindThis
 	/**
@@ -287,27 +289,34 @@ export class MemoryKVCache<T> {
 	@bindThis
 	public gc(): void {
 		const now = Date.now();
+
 		for (const [key, { date }] of this.cache.entries()) {
-			if ((now - date) > this.lifetime) {
+			// The map is ordered from oldest to youngest.
+			// We can stop once we find an entry that's still active, because all following entries must *also* be active.
+			const age = now - date;
+			if (age < this.lifetime) break;
+
 			this.cache.delete(key);
 		}
 	}
-	}
 
 	@bindThis
 	public dispose(): void {
 		clearInterval(this.gcIntervalHandle);
 	}
+
+	public get entries() {
+		return this.cache.entries();
+	}
 }
 
 export class MemorySingleCache<T> {
 	private cachedAt: number | null = null;
 	private value: T | undefined;
-	private lifetime: number;
 
-	constructor(lifetime: MemorySingleCache<never>['lifetime']) {
+	constructor(
-		this.lifetime = lifetime;
+		private lifetime: number,
-	}
+	) {}
 
 	@bindThis
 	public set(value: T): void {

packages/backend/src/queue/processors/DeliverProcessorService.ts

@@ -45,7 +45,7 @@ export class DeliverProcessorService {
 		private queueLoggerService: QueueLoggerService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('deliver');
-		this.suspendedHostsCache = new MemorySingleCache<MiInstance[]>(1000 * 60 * 60);
+		this.suspendedHostsCache = new MemorySingleCache<MiInstance[]>(1000 * 60 * 60); // 1h
 	}
 
 	@bindThis

packages/backend/src/server/NodeinfoServerService.ts

@@ -135,7 +135,7 @@ export class NodeinfoServerService {
 			return document;
 		};
 
-		const cache = new MemorySingleCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10);
+		const cache = new MemorySingleCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10); // 10m
 
 		fastify.get(nodeinfo2_1path, async (request, reply) => {
 			const base = await cache.fetch(() => nodeinfo2(21));

packages/backend/src/server/api/AuthenticateService.ts

@@ -37,7 +37,7 @@ export class AuthenticateService implements OnApplicationShutdown {
 
 		private cacheService: CacheService,
 	) {
-		this.appCache = new MemoryKVCache<MiApp>(Infinity);
+		this.appCache = new MemoryKVCache<MiApp>(1000 * 60 * 60 * 24 * 7); // 1w
 	}
 
 	@bindThis

packages/backend/src/server/web/UrlPreviewService.ts

@@ -38,8 +38,8 @@ export class UrlPreviewService {
 	) {
 		this.logger = this.loggerService.getLogger('url-preview');
 		this.previewCache = new RedisKVCache<SummalyResult>(this.redisClient, 'summaly', {
-			lifetime: 1000 * 86400,
+			lifetime: 1000 * 60 * 60 * 24, // 1d
-			memoryCacheLifetime: 1000 * 10 * 60,
+			memoryCacheLifetime: 1000 * 60 * 10, // 10m
 			fetcher: (key: string) => { throw new Error('the UrlPreview cache should never fetch'); },
 			toRedisConverter: (value) => JSON.stringify(value),
 			fromRedisConverter: (value) => JSON.parse(value),