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FIX (rel #3)

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Overtorment 2019-01-09 02:38:54 +00:00
parent dd7430503d
commit 4317123ffe
1 changed files with 4 additions and 16 deletions
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20
class/Lock.js
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@ -1,5 +1,3 @@
const crypto = require('crypto');
export class Lock { export class Lock {
/** /**
* *
@ -18,20 +16,10 @@ export class Lock {
* @returns {Promise<boolean>} * @returns {Promise<boolean>}
*/ */
async obtainLock() { async obtainLock() {
if (await this._redis.get(this._lock_key)) { const timestamp = +new Date();
// someone already has the lock let setResult = await this._redis.setnx(this._lock_key, timestamp);
return false; if (!setResult) {
} // it already held a value - failed locking
// trying to set the lock:
let buffer = crypto.randomBytes(10);
const randomValue = buffer.toString('hex');
await this._redis.set(this._lock_key, randomValue);
// checking if it was set:
let value = await this._redis.get(this._lock_key);
if (value !== randomValue) {
// someone else managed to obtain this lock
return false; return false;
} }