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import { promisify } from 'node:util';
import { Inject, Injectable } from '@nestjs/common';
import redisLock from 'redis-lock';
import * as Redis from 'ioredis';
import { DI } from '@/di-symbols.js';
import { bindThis } from '@/decorators.js';
/**
* Retry delay (ms) for lock acquisition
*/
const retryDelay = 100;
@Injectable()
export class AppLockService {
private lock: (key: string, timeout?: number, _?: (() => Promise<void>) | undefined) => Promise<() => void>;
constructor(
@Inject(DI.redis)
private redisClient: Redis.Redis,
) {
this.lock = promisify(redisLock(this.redisClient, retryDelay));
}
/**
* Get AP Object lock
* @param uri AP object ID
* @param timeout Lock timeout (ms), The timeout releases previous lock.
* @returns Unlock function
*/
@bindThis
public getApLock(uri: string, timeout = 30 * 1000): Promise<() => void> {
return this.lock(`ap-object:${uri}`, timeout);
}
@bindThis
public getFetchInstanceMetadataLock(host: string, timeout = 30 * 1000): Promise<() => void> {
return this.lock(`instance:${host}`, timeout);
}
@bindThis
public getChartInsertLock(lockKey: string, timeout = 30 * 1000): Promise<() => void> {
return this.lock(`chart-insert:${lockKey}`, timeout);
}
}
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