forked from MapComplete/MapComplete
47 lines
1.7 KiB
TypeScript
47 lines
1.7 KiB
TypeScript
import { UIEventSource } from "../UIEventSource"
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import { Utils } from "../../Utils"
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/**
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* Fetches data from random data sources, used in the metatagging
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*/
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export default class LiveQueryHandler {
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private static neededShorthands = {} // url -> (shorthand:paths)[]
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public static FetchLiveData(
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url: string,
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shorthands: string[]
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): 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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Utils.downloadJson(url).then((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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