forked from MapComplete/MapComplete
53 lines
1.7 KiB
TypeScript
53 lines
1.7 KiB
TypeScript
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/**
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* Fetches data from random data sources
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*/
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import {UIEventSource} from "../UIEventSource";
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import * as $ from "jquery"
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export default class LiveQueryHandler {
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private static cache = {} // url --> UIEventSource<actual data>
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private static neededShorthands = {} // url -> (shorthand:paths)[]
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public static FetchLiveData(url: string, shorthands: string[]): UIEventSource<any /* string -> string */> {
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const shorthandsSet: string[] = LiveQueryHandler.neededShorthands[url] ?? []
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for (const shorthand of shorthands) {
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if (shorthandsSet.indexOf(shorthand) < 0) {
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shorthandsSet.push(shorthand);
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}
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}
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LiveQueryHandler.neededShorthands[url] = shorthandsSet;
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if (LiveQueryHandler[url] === undefined) {
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const source = new UIEventSource({});
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LiveQueryHandler[url] = source;
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console.log("Fetching live data from a third-party (unknown) API:",url)
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$.getJSON(url, function (data) {
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for (const shorthandDescription of shorthandsSet) {
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const descr = shorthandDescription.trim().split(":");
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const shorthand = descr[0];
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const path = descr[1];
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const parts = path.split(".");
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let trail = data;
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for (const part of parts) {
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if (trail !== undefined) {
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trail = trail[part];
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}
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}
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source.data[shorthand] = trail;
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}
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source.ping();
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})
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}
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return LiveQueryHandler[url];
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}
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}
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