mapcomplete/Logic/Web/LiveQueryHandler.ts
2021-01-02 16:04:16 +01:00

51 lines
No EOL
1.6 KiB
TypeScript

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