199 lines
No EOL
7.1 KiB
TypeScript
199 lines
No EOL
7.1 KiB
TypeScript
import {UIEventSource} from "../UIEventSource";
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import Loc from "../../Models/Loc";
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import {Or, TagsFilter} from "../Tags";
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import LayoutConfig from "../../Customizations/JSON/LayoutConfig";
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import {Overpass} from "../Osm/Overpass";
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import Bounds from "../../Models/Bounds";
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import FeatureSource from "../FeatureSource/FeatureSource";
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import {Utils} from "../../Utils";
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export default class UpdateFromOverpass implements FeatureSource {
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/**
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* The last loaded features of the geojson
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*/
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public readonly features: UIEventSource<{ feature: any, freshness: Date }[]> = new UIEventSource<any[]>(undefined);
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public readonly sufficientlyZoomed: UIEventSource<boolean>;
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public readonly runningQuery: UIEventSource<boolean> = new UIEventSource<boolean>(false);
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public readonly timeout: UIEventSource<number> = new UIEventSource<number>(0);
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private readonly retries: UIEventSource<number> = new UIEventSource<number>(0);
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/**
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* The previous bounds for which the query has been run at the given zoom level
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*
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* Note that some layers only activate on a certain zoom level.
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* If the map location changes, we check for each layer if it is loaded:
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* we start checking the bounds at the first zoom level the layer might operate. If in bounds - no reload needed, otherwise we continue walking down
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*/
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private readonly _previousBounds: Map<number, Bounds[]> = new Map<number, Bounds[]>();
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private readonly _location: UIEventSource<Loc>;
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private readonly _layoutToUse: UIEventSource<LayoutConfig>;
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private readonly _leafletMap: UIEventSource<L.Map>;
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/**
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* The most important layer should go first, as that one gets first pick for the questions
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*/
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constructor(
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location: UIEventSource<Loc>,
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layoutToUse: UIEventSource<LayoutConfig>,
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leafletMap: UIEventSource<L.Map>) {
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this._location = location;
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this._layoutToUse = layoutToUse;
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this._leafletMap = leafletMap;
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const self = this;
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this.sufficientlyZoomed = location.map(location => {
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if (location?.zoom === undefined) {
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return false;
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}
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let minzoom = Math.min(...layoutToUse.data.layers.map(layer => layer.minzoom ?? 18));
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return location.zoom >= minzoom;
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}, [layoutToUse]
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);
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for (let i = 0; i < 25; i++) {
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// This update removes all data on all layers -> erase the map on lower levels too
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this._previousBounds.set(i, []);
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}
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layoutToUse.addCallback(() => {
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self.update()
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});
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location.addCallback(() => {
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self.update()
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});
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}
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public ForceRefresh() {
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for (let i = 0; i < 25; i++) {
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this._previousBounds.set(i, []);
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}
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this.update();
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}
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private GetFilter(): Overpass {
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let filters: TagsFilter[] = [];
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let extraScripts: string[] = [];
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for (const layer of this._layoutToUse.data.layers) {
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if (typeof (layer) === "string") {
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throw "A layer was not expanded!"
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}
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if (this._location.data.zoom < layer.minzoom) {
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continue;
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}
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if (layer.doNotDownload) {
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continue;
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}
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// Check if data for this layer has already been loaded
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let previouslyLoaded = false;
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for (let z = layer.minzoom; z < 25 && !previouslyLoaded; z++) {
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const previousLoadedBounds = this._previousBounds.get(z);
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if (previousLoadedBounds === undefined) {
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continue;
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}
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for (const previousLoadedBound of previousLoadedBounds) {
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previouslyLoaded = previouslyLoaded || this.IsInBounds(previousLoadedBound);
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if (previouslyLoaded) {
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break;
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}
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}
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}
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if (previouslyLoaded) {
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continue;
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}
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if (layer.source.overpassScript !== undefined) {
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extraScripts.push(layer.source.overpassScript)
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} else {
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filters.push(layer.source.osmTags);
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}
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}
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filters = Utils.NoNull(filters)
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extraScripts = Utils.NoNull(extraScripts)
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if (filters.length + extraScripts.length === 0) {
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return undefined;
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}
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return new Overpass(new Or(filters), extraScripts);
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}
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private update(): void {
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if (this.runningQuery.data) {
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console.log("Still running a query, skip");
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return;
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}
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const bounds = this._leafletMap.data.getBounds();
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const diff = this._layoutToUse.data.widenFactor;
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const n = Math.min(90, bounds.getNorth() + diff);
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const e = Math.min(180, bounds.getEast() + diff);
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const s = Math.max(-90, bounds.getSouth() - diff);
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const w = Math.max(-180, bounds.getWest() - diff);
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const queryBounds = {north: n, east: e, south: s, west: w};
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const z = Math.floor(this._location.data.zoom ?? 0);
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const self = this;
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const overpass = this.GetFilter();
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if (overpass === undefined) {
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return;
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}
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this.runningQuery.setData(true);
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overpass.queryGeoJson(queryBounds,
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function (data, date) {
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self._previousBounds.get(z).push(queryBounds);
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self.retries.setData(0);
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self.features.setData(data.features.map(f => ({feature: f, freshness: date})));
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self.runningQuery.setData(false);
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},
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function (reason) {
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self.retries.data++;
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self.ForceRefresh();
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self.timeout.setData(self.retries.data * 5);
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console.log(`QUERY FAILED (retrying in ${5 * self.retries.data} sec)`, reason);
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self.retries.ping();
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self.runningQuery.setData(false);
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function countDown() {
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window?.setTimeout(
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function () {
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console.log("Countdown: ", self.timeout.data)
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if (self.timeout.data > 1) {
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self.timeout.setData(self.timeout.data - 1);
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window.setTimeout(
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countDown,
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1000
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)
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} else {
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self.timeout.setData(0);
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self.update()
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}
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}, 1000
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)
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}
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countDown();
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}
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);
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}
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private IsInBounds(bounds: Bounds): boolean {
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if (this._previousBounds === undefined) {
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return false;
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}
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const b = this._leafletMap.data.getBounds();
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return b.getSouth() >= bounds.south &&
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b.getNorth() <= bounds.north &&
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b.getEast() <= bounds.east &&
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b.getWest() >= bounds.west;
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}
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} |