100 lines
2.7 KiB
JavaScript
100 lines
2.7 KiB
JavaScript
import { rewriteUrl } from './cors.mjs';
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const json = (url, params) => fetchAsync(url, 'json', params);
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const text = (url, params) => fetchAsync(url, 'text', params);
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const blob = (url, params) => fetchAsync(url, 'blob', params);
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const fetchAsync = async (_url, responseType, _params = {}) => {
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// combine default and provided parameters
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const params = {
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method: 'GET',
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mode: 'cors',
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type: 'GET',
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retryCount: 0,
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..._params,
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};
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// store original number of retries
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params.originalRetries = params.retryCount;
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// build a url, including the rewrite for cors if necessary
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let corsUrl = _url;
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if (params.cors === true) corsUrl = rewriteUrl(_url);
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const url = new URL(corsUrl, `${window.location.origin}/`);
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// match the security protocol when not on localhost
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url.protocol = window.location.hostname !== 'localhost' ? window.location.protocol : url.protocol;
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// add parameters if necessary
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if (params.data) {
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Object.keys(params.data).forEach((key) => {
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// get the value
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const value = params.data[key];
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// add to the url
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url.searchParams.append(key, value);
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});
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}
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// make the request
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const response = await doFetch(url, params);
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// check for ok response
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if (!response.ok) throw new Error(`Fetch error ${response.status} ${response.statusText} while fetching ${response.url}`);
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// return the requested response
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switch (responseType) {
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case 'json':
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return response.json();
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case 'text':
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return response.text();
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case 'blob':
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return response.blob();
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default:
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return response;
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}
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};
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// fetch with retry and back-off
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const doFetch = (url, params) => new Promise((resolve, reject) => {
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fetch(url, params).then((response) => {
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if (params.retryCount > 0) {
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// 500 status codes should be retried after a short backoff
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if (response.status >= 500 && response.status <= 599 && params.retryCount > 0) {
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// call the "still waiting" function
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if (typeof params.stillWaiting === 'function' && params.retryCount === params.originalRetries) {
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params.stillWaiting();
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}
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// decrement and retry
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const newParams = {
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...params,
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retryCount: params.retryCount - 1,
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};
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return resolve(delay(retryDelay(params.originalRetries - newParams.retryCount), doFetch, url, newParams));
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}
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// not 500 status
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return resolve(response);
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}
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// out of retries
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return resolve(response);
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})
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.catch((e) => reject(e));
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});
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const delay = (time, func, ...args) => new Promise((resolve) => {
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setTimeout(() => {
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resolve(func(...args));
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}, time);
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});
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const retryDelay = (retryNumber) => {
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switch (retryNumber) {
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case 1: return 1000;
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case 2: return 2000;
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case 3: return 5000;
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case 4: return 10000;
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default: return 30000;
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}
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};
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export {
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json,
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text,
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blob,
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};
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