backoff-promise

 

An exponential backoff for promises

Example 1

``js
var i = 0,
Backoff = require('backoff-promise'),
backoff = new Backoff();

var myPromise = function () {
return new Promise(function (resolve, reject) {
if (i++ < 5) {
reject(new Error('transient-error'));
} else {
resolve('foo');
}
});
};

return backoff.run(function () {
return myPromise();
});
`

Example 2: Different types of errors

`js
var i = 0,
Backoff = require('backoff-promise'),
backoff = new Backoff();

var myPromise = function () {
return new Promise(function (resolve, reject) {
if (i++ < 3) {
reject(new Error('transient-error'));
} else {
reject(new Error('permanent-error'));
}
});
};

var shouldRetry = function (err) {
// Permanent error? If so, then stop retrying
if (err.message === 'permanent-error') {
throw err;
}
};

return backoff.run(function () {
return myPromise();
}, shouldRetry).catch(function (err) {
// err.message = 'transient-error'
});
`

API

`
var backoff = Backoff(startingRetryAfterMSecs, maxRetryAfterMSecs, backoffFactor, maxRetries)
``