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start some es6ifying #28

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start some es6ifying #28

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f5cf79c
start some es6ifying
jonmaim Jan 24, 2020
70c4c97
e6ify and comments
jonmaim Jan 24, 2020
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16 changes: 9 additions & 7 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,24 +1,26 @@
"use strict";

var util = require('util');
var defaultTimeout = 5000;
var promisify = util.promisify || function(x) { return x; };
const util = require('util');
const defaultTimeout = 5000;
const promisify = util.promisify || function(x) { return x; };

function acquireLock(client, lockName, timeout, retryDelay, onLockAcquired) {
function retry() {
setTimeout(function() {
/* this is where we recursively re-call ourself */
setTimeout(() => {
acquireLock(client, lockName, timeout, retryDelay, onLockAcquired);
}, retryDelay);
}

var lockTimeoutValue = (Date.now() + timeout + 1);
client.set(lockName, lockTimeoutValue, 'PX', timeout, 'NX', function(err, result) {
/* `lockTimeoutValue` is the value after which the lock is automatically released. wathever the use? */
const lockTimeoutValue = (Date.now() + timeout + /* just in case is 0 we add 1 ms */ 1);
client.set(lockName, lockTimeoutValue, 'PX', timeout, 'NX', (err, result) => {
if(err || result === null) return retry();
onLockAcquired(lockTimeoutValue);
});
}

module.exports = function(client, retryDelay) {
module.exports = (client, retryDelay) => {
if(!(client && client.setnx)) {
throw new Error("You must specify a client instance of http://github.com/mranney/node_redis");
}
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