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goober-ionic/platforms/android/cordova/lib/retry.js
2018-07-15 19:24:48 -07:00

68 lines
2.4 KiB
JavaScript

#!/usr/bin/env node
/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
*/
/* jshint node: true */
'use strict';
var events = require('cordova-common').events;
/*
* Retry a promise-returning function a number of times, propagating its
* results on success or throwing its error on a failed final attempt.
*
* @arg {Number} attemts_left - The number of times to retry the passed call.
* @arg {Function} promiseFunction - A function that returns a promise.
* @arg {...} - Arguments to pass to promiseFunction.
*
* @returns {Promise}
*/
module.exports.retryPromise = function (attemts_left, promiseFunction) {
// NOTE:
// get all trailing arguments, by skipping the first two (attemts_left and
// promiseFunction) because they shouldn't get passed to promiseFunction
var promiseFunctionArguments = Array.prototype.slice.call(arguments, 2);
return promiseFunction.apply(undefined, promiseFunctionArguments).then(
// on success pass results through
function onFulfilled (value) {
return value;
},
// on rejection either retry, or throw the error
function onRejected (error) {
attemts_left -= 1;
if (attemts_left < 1) {
throw error;
}
events.emit('verbose', 'A retried call failed. Retrying ' + attemts_left + ' more time(s).');
// retry call self again with the same arguments, except attemts_left is now lower
var fullArguments = [attemts_left, promiseFunction].concat(promiseFunctionArguments);
return module.exports.retryPromise.apply(undefined, fullArguments);
}
);
};