mapcomplete/Logic/Actors/UpdateFromOverpass.ts
2021-01-06 02:52:38 +01:00

178 lines
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6.1 KiB
TypeScript

import {UIEventSource} from "../UIEventSource";
import Loc from "../../Models/Loc";
import {Or, TagsFilter} from "../Tags";
import LayoutConfig from "../../Customizations/JSON/LayoutConfig";
import {Overpass} from "../Osm/Overpass";
import Bounds from "../../Models/Bounds";
import FeatureSource from "../FeatureSource/FeatureSource";
export default class UpdateFromOverpass implements FeatureSource{
/**
* The last loaded features of the geojson
*/
public readonly features: UIEventSource<{feature:any, freshness: Date}[]> = new UIEventSource<any[]>(undefined);
public readonly sufficientlyZoomed: UIEventSource<boolean>;
public readonly runningQuery: UIEventSource<boolean> = new UIEventSource<boolean>(false);
public readonly retries: UIEventSource<number> = new UIEventSource<number>(0);
/**
* The previous bounds for which the query has been run at the given zoom level
*
* Note that some layers only activate on a certain zoom level.
* If the map location changes, we check for each layer if it is loaded:
* 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
*/
private readonly _previousBounds: Map<number, Bounds[]> = new Map<number, Bounds[]>();
private readonly _location: UIEventSource<Loc>;
private readonly _layoutToUse: UIEventSource<LayoutConfig>;
private readonly _leafletMap: UIEventSource<L.Map>;
/**
* The most important layer should go first, as that one gets first pick for the questions
*/
constructor(
location: UIEventSource<Loc>,
layoutToUse: UIEventSource<LayoutConfig>,
leafletMap: UIEventSource<L.Map>) {
this._location = location;
this._layoutToUse = layoutToUse;
this._leafletMap = leafletMap;
const self = this;
this.sufficientlyZoomed = location.map(location => {
if(location?.zoom === undefined){
return false;
}
let minzoom = Math.min(...layoutToUse.data.layers.map(layer => layer.minzoom ?? 18));
return location.zoom >= minzoom;
}, [layoutToUse]
);
for (let i = 0; i < 25; i++) {
// This update removes all data on all layers -> erase the map on lower levels too
this._previousBounds.set(i, []);
}
layoutToUse.addCallback(() => {
self.update()
});
location.addCallbackAndRun(() => {
self.update()
});
}
public ForceRefresh() {
for (let i = 0; i < 25; i++) {
this._previousBounds.set(i, []);
}
this.update();
}
private GetFilter() {
const filters: TagsFilter[] = [];
for (const layer of this._layoutToUse.data.layers) {
if(typeof(layer) === "string"){
continue;
}
if (this._location.data.zoom < layer.minzoom) {
continue;
}
if(layer.doNotDownload){
continue;
}
// Check if data for this layer has already been loaded
let previouslyLoaded = false;
for (let z = layer.minzoom; z < 25 && !previouslyLoaded; z++) {
const previousLoadedBounds = this._previousBounds.get(z);
if (previousLoadedBounds === undefined) {
continue;
}
for (const previousLoadedBound of previousLoadedBounds) {
previouslyLoaded = previouslyLoaded || this.IsInBounds(previousLoadedBound);
if(previouslyLoaded){
break;
}
}
}
if (previouslyLoaded) {
continue;
}
filters.push(layer.overpassTags);
}
if (filters.length === 0) {
return undefined;
}
return new Or(filters);
}
private update(): void {
const filter = this.GetFilter();
if (filter === undefined) {
return;
}
if (this.runningQuery.data) {
console.log("Still running a query, skip");
return;
}
const bounds = this._leafletMap.data.getBounds();
const diff = this._layoutToUse.data.widenFactor;
const n = Math.min(90, bounds.getNorth() + diff);
const e = Math.min(180, bounds.getEast() + diff);
const s = Math.max(-90, bounds.getSouth() - diff);
const w = Math.max(-180, bounds.getWest() - diff);
const queryBounds = {north: n, east: e, south: s, west: w};
const z = Math.floor(this._location.data.zoom);
this.runningQuery.setData(true);
const self = this;
const overpass = new Overpass(filter);
overpass.queryGeoJson(queryBounds,
function (data, date) {
self._previousBounds.get(z).push(queryBounds);
self.retries.setData(0);
self.features.setData(data.features.map(f => ({feature: f, freshness: date})));
self.runningQuery.setData(false);
},
function (reason) {
self.retries.data++;
self.ForceRefresh();
console.log(`QUERY FAILED (retrying in ${5 * self.retries.data} sec)`, undefined);
self.retries.ping();
self.runningQuery.setData(false)
window?.setTimeout(
function () {
self.update()
}, self.retries.data * 5000
)
}
);
}
private IsInBounds(bounds: Bounds): boolean {
if (this._previousBounds === undefined) {
return false;
}
const b = this._leafletMap.data.getBounds();
return b.getSouth() >= bounds.south &&
b.getNorth() <= bounds.north &&
b.getEast() <= bounds.east &&
b.getWest() >= bounds.west;
}
}