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fix(race-condition): acquire lock on set and incr if already set #59

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fix(race-condition): acquire lock on set and incr if already set #59

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19 changes: 16 additions & 3 deletions src/RedisStore.js
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,17 @@ const redis = require('redis');
*
* Class RedisStore
*/

async function SET_NX_EX (key, seconds, counter, incrIfExists) {
const OK = await this.client.sendCommand([
'SET', key, counter.toString(),
'NX',
'EX', seconds.toString()
])
if (!OK) var counterUpdated = await this.client.incrBy(key, incrIfExists)
return counterUpdated
}

class RedisStore extends Store {
/**
* constructor
Expand All @@ -51,19 +62,21 @@ class RedisStore extends Store {
async _hit(key, options, weight) {

let [counter, dateEnd] = await this.client.multi().get(key).ttl(key).exec();

if(counter === null) {
counter = weight;
dateEnd = Date.now() + options.interval;

const seconds = Math.ceil(options.interval / 1000);
await this.client.setEx(key, seconds.toString(), counter.toString());
const counterUpdated = await SET_NX_EX.call(this, key, seconds, counter, weight)
if (counterUpdated) { counter = counterUpdated }
} else if (dateEnd === -2 || dateEnd === -1) {
counter = counter + weight;
dateEnd = Date.now() + options.interval;

const seconds = Math.ceil(options.interval / 1000);
await this.client.setEx(key, seconds.toString(), counter.toString());
const counterUpdated = await SET_NX_EX.call(this, key, seconds, counter, weight)
if (counterUpdated) { counter = counterUpdated }
} else {
counter = await this.client.incrBy(key, weight);
}
Expand Down