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index.js
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index.js
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'use strict';
require('isomorphic-fetch');
require('es6-promise').polyfill();
module.exports = function(url, options) {
var retries = 3;
var retryDelay = 1000;
var retryOn = [];
if (options && options.retries) {
retries = options.retries;
}
if (options && options.retryDelay) {
retryDelay = options.retryDelay;
}
if (options && options.retryOn) {
if (options.retryOn instanceof Array) {
retryOn = options.retryOn;
} else {
throw {
name: 'ArgumentError',
message: 'retryOn property expects an array'
}
}
}
return new Promise(function(resolve, reject) {
var wrappedFetch = function(n) {
fetch(url, options)
.then(function(response) {
if (retryOn.indexOf(response.status) === -1) {
resolve(response);
} else {
if (n > 0) {
retry(n);
} else {
reject(response);
}
}
})
.catch(function(error) {
if (n > 0) {
retry(n);
} else {
reject(error);
}
});
};
function retry(n) {
setTimeout(function() {
wrappedFetch(--n);
}, retryDelay);
}
wrappedFetch(retries);
});
};