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perf(backend): Reduce memory usage of MemoryKVCache (#11076) 

* perf(backend): Reduce memory usage of MemoryKVCache

* fix
This commit is contained in:
tamaina 2023-07-08 21:18:16 +09:00 committed by GitHub
parent 5b8fa25a12
commit 7ec07d5fd2
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2 changed files with 64 additions and 17 deletions
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47
packages/backend/src/core/CacheService.ts
View File

@ -11,10 +11,10 @@ import type { OnApplicationShutdown } from '@nestjs/common';
@Injectable()
export class CacheService implements OnApplicationShutdown {
public userByIdCache: MemoryKVCache<User>;
public localUserByNativeTokenCache: MemoryKVCache<LocalUser | null>;
public userByIdCache: MemoryKVCache<User, User | string>;
public localUserByNativeTokenCache: MemoryKVCache<LocalUser | null, string | null>;
public localUserByIdCache: MemoryKVCache<LocalUser>;
public uriPersonCache: MemoryKVCache<User | null>;
public uriPersonCache: MemoryKVCache<User | null, string | null>;
public userProfileCache: RedisKVCache<UserProfile>;
public userMutingsCache: RedisKVCache<Set<string>>;
public userBlockingCache: RedisKVCache<Set<string>>;
@ -55,10 +55,41 @@ export class CacheService implements OnApplicationShutdown {
) {
//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);
const localUserByIdCache = new MemoryKVCache<LocalUser>(1000 * 60 * 60 * 6 /* 6h */);
this.localUserByIdCache = localUserByIdCache;
// ローカルユーザーならlocalUserByIdCacheにデータを追加し、こちらにはid(文字列)だけを追加する
const userByIdCache = new MemoryKVCache<User, User | string>(1000 * 60 * 60 * 6 /* 6h */, {
toMapConverter: user => {
if (user.host === null) {
localUserByIdCache.set(user.id, user as LocalUser);
return user.id;
}
return user;
},
fromMapConverter: userOrId => typeof userOrId === 'string' ? localUserByIdCache.get(userOrId) : userOrId,
});
this.userByIdCache = userByIdCache;
this.localUserByNativeTokenCache = new MemoryKVCache<LocalUser | null, string | null>(Infinity, {
toMapConverter: user => {
if (user === null) return null;
localUserByIdCache.set(user.id, user);
return user.id;
},
fromMapConverter: id => id === null ? null : localUserByIdCache.get(id),
});
this.uriPersonCache = new MemoryKVCache<User | null, string | null>(Infinity, {
toMapConverter: user => {
if (user === null) return null;
userByIdCache.set(user.id, user);
return user.id;
},
fromMapConverter: id => id === null ? null : userByIdCache.get(id),
});
this.userProfileCache = new RedisKVCache<UserProfile>(this.redisClient, 'userProfile', {
lifetime: 1000 * 60 * 30, // 30m
@ -131,7 +162,7 @@ export class CacheService implements OnApplicationShutdown {
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) {
if (v.value === user.id) {
this.uriPersonCache.set(k, user);
}
}

34
packages/backend/src/misc/cache.ts
View File

@ -181,14 +181,28 @@ 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> {
public cache: Map<string, { date: number; value: T; }>;
function nothingToDo<T, V = T>(value: T): V {
return value as unknown as V;
}
export class MemoryKVCache<T, V = T> {
public cache: Map<string, { date: number; value: V; }>;
private lifetime: number;
private gcIntervalHandle: NodeJS.Timer;
private toMapConverter: (value: T) => V;
private fromMapConverter: (cached: V) => T | undefined;
constructor(lifetime: MemoryKVCache<never>['lifetime']) {
constructor(lifetime: MemoryKVCache<never>['lifetime'], options: {
toMapConverter: (value: T) => V;
fromMapConverter: (cached: V) => T | undefined;
} = {
toMapConverter: nothingToDo,
fromMapConverter: nothingToDo,
}) {
this.cache = new Map();
this.lifetime = lifetime;
this.toMapConverter = options.toMapConverter;
this.fromMapConverter = options.fromMapConverter;
this.gcIntervalHandle = setInterval(() => {
this.gc();
@ -199,7 +213,7 @@ export class MemoryKVCache<T> {
public set(key: string, value: T): void {
this.cache.set(key, {
date: Date.now(),
value,
value: this.toMapConverter(value),
});
}
@ -211,7 +225,7 @@ export class MemoryKVCache<T> {
this.cache.delete(key);
return undefined;
}
return cached.value;
return this.fromMapConverter(cached.value);
}
@bindThis
@ -222,9 +236,10 @@ export class MemoryKVCache<T> {
/**
* キャッシュがあればそれを返し、無ければfetcherを呼び出して結果をキャッシュ&返します
* optional: キャッシュが存在してもvalidatorでfalseを返すとキャッシュ無効扱いにします
* fetcherの引数はcacheに保存されている値があれば渡されます
*/
@bindThis
public async fetch(key: string, fetcher: () => Promise<T>, validator?: (cachedValue: T) => boolean): Promise<T> {
public async fetch(key: string, fetcher: (value: V | undefined) => Promise<T>, validator?: (cachedValue: T) => boolean): Promise<T> {
const cachedValue = this.get(key);
if (cachedValue !== undefined) {
if (validator) {
@ -239,7 +254,7 @@ export class MemoryKVCache<T> {
}
// Cache MISS
const value = await fetcher();
const value = await fetcher(this.cache.get(key)?.value);
this.set(key, value);
return value;
}
@ -247,9 +262,10 @@ export class MemoryKVCache<T> {
/**
* キャッシュがあればそれを返し、無ければfetcherを呼び出して結果をキャッシュ&返します
* optional: キャッシュが存在してもvalidatorでfalseを返すとキャッシュ無効扱いにします
* fetcherの引数はcacheに保存されている値があれば渡されます
*/
@bindThis
public async fetchMaybe(key: string, fetcher: () => Promise<T | undefined>, validator?: (cachedValue: T) => boolean): Promise<T | undefined> {
public async fetchMaybe(key: string, fetcher: (value: V | undefined) => Promise<T | undefined>, validator?: (cachedValue: T) => boolean): Promise<T | undefined> {
const cachedValue = this.get(key);
if (cachedValue !== undefined) {
if (validator) {
@ -264,7 +280,7 @@ export class MemoryKVCache<T> {
}
// Cache MISS
const value = await fetcher();
const value = await fetcher(this.cache.get(key)?.value);
if (value !== undefined) {
this.set(key, value);
}