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fix(backend): memory leak in memory caches (#14363)

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* encapsulate `MemoryKVCache<T>`

* remove infinity caches

* encapsulate other caches

* add missing awaits to internally synchronize caches

* implement pull-through caching

* tune cache lifetimes

* optimize cache GC by stopping early

* summarize changes in CHANGELOG.md

* Fix timeout comments

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>

* add comments about awaiting the redis write

---------

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>
This commit is contained in:
Hazel K
2024-08-18 00:34:01 -04:00
committed by GitHub
parent 3cd5f86510
commit 9ce44b24b8
12 changed files with 101 additions and 84 deletions
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12
packages/backend/src/core/CustomEmojiService.ts
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@@ -24,7 +24,7 @@ const parseEmojiStrRegexp = /^([-\w]+)(?:@([\w.-]+))?$/;
@Injectable()
export class CustomEmojiService implements OnApplicationShutdown {
private cache: MemoryKVCache<MiEmoji | null>;
private emojisCache: MemoryKVCache<MiEmoji | null>;
public localEmojisCache: RedisSingleCache<Map<string, MiEmoji>>;
constructor(
@@ -40,7 +40,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
private moderationLogService: ModerationLogService,
private globalEventService: GlobalEventService,
) {
this.cache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12);
this.emojisCache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12); // 12h
this.localEmojisCache = new RedisSingleCache<Map<string, MiEmoji>>(this.redisClient, 'localEmojis', {
lifetime: 1000 * 60 * 30, // 30m
@@ -334,7 +334,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
host,
})) ?? null;
const emoji = await this.cache.fetch(`${name} ${host}`, queryOrNull);
const emoji = await this.emojisCache.fetch(`${name} ${host}`, queryOrNull);
if (emoji == null) return null;
return emoji.publicUrl || emoji.originalUrl; // || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
@@ -361,7 +361,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
*/
@bindThis
public async prefetchEmojis(emojis: { name: string; host: string | null; }[]): Promise<void> {
const notCachedEmojis = emojis.filter(emoji => this.cache.get(`${emoji.name} ${emoji.host}`) == null);
const notCachedEmojis = emojis.filter(emoji => this.emojisCache.get(`${emoji.name} ${emoji.host}`) == null);
const emojisQuery: any[] = [];
const hosts = new Set(notCachedEmojis.map(e => e.host));
for (const host of hosts) {
@@ -376,7 +376,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
select: ['name', 'host', 'originalUrl', 'publicUrl'],
}) : [];
for (const emoji of _emojis) {
this.cache.set(`${emoji.name} ${emoji.host}`, emoji);
this.emojisCache.set(`${emoji.name} ${emoji.host}`, emoji);
}
}
@@ -401,7 +401,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
@bindThis
public dispose(): void {
this.cache.dispose();
this.emojisCache.dispose();
}
@bindThis