forked from MapComplete/MapComplete
119 lines
4.3 KiB
TypeScript
119 lines
4.3 KiB
TypeScript
import { Tiles } from "../../src/Models/TileRange"
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import { Server } from "../server"
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import Script from "../Script"
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import { OsmPoiDatabase } from "./osmPoiDatabase"
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class CachedSqlCount {
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private readonly _cache: Record<
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string,
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Record<
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number,
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{
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date: Date
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entry: { count: number; lat: number; lon: number }
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}
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>
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> = {}
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private readonly _poiDatabase: OsmPoiDatabase
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private readonly _maxAge: number
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constructor(poiDatabase: OsmPoiDatabase, maxAge: number) {
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this._poiDatabase = poiDatabase
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this._maxAge = maxAge
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}
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public async getCount(
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layer: string,
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tileId: number
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): Promise<{ count: number; lat: number; lon: number }> {
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const cachedEntry = this._cache[layer]?.[tileId]
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if (cachedEntry) {
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const age = (new Date().getTime() - cachedEntry.date.getTime()) / 1000
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if (age < this._maxAge) {
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return cachedEntry.entry
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}
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}
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const bbox = Tiles.tile_bounds_lon_lat(...Tiles.tile_from_index(tileId))
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const count = await this._poiDatabase.getCount(layer, bbox)
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if (!this._cache[layer]) {
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this._cache[layer] = {}
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}
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this._cache[layer][tileId] = { entry: count, date: new Date() }
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return count
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}
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}
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class TileCountServer extends Script {
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constructor() {
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super(
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"Starts the tilecount server which calculates summary for a given tile, based on the database. Usage: [db-connection-string] [port=2345]"
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)
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}
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async main(args: string[]): Promise<void> {
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const connectionString = args[0] ?? "postgresql://user:password@localhost:5444"
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const port = Number(args[1] ?? 2345)
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console.log("Connecting to database", connectionString)
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const tcs = new OsmPoiDatabase(connectionString)
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const withCache = new CachedSqlCount(tcs, 14 * 60 * 60 * 24)
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new Server(port, { ignorePathPrefix: ["summary"] }, [
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{
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mustMatch: "status.json",
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mimetype: "application/json",
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handle: async () => {
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const layers = await tcs.getLayers()
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const meta = await tcs.getMeta()
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const mostSuitable = await tcs.findSuitableDatabases()
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return JSON.stringify({ meta,
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suitableDatabases: mostSuitable,
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layers: Array.from(layers) })
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},
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},
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{
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mustMatch: /[a-zA-Z0-9+_-]+\/[0-9]+\/[0-9]+\/[0-9]+\.json/,
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mimetype: "application/json", // "application/vnd.geo+json",
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async handle(path) {
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const [layers, z, x, y] = path.split(".")[0].split("/")
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let sum = 0
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const properties: Record<string, number> = {}
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const availableLayers = await tcs.getLayers()
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let latSum = 0
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let lonSum = 0
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for (const layer of layers.split("+")) {
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if (!availableLayers.has(layer)) {
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continue
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}
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const count = await withCache.getCount(
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layer,
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Tiles.tile_index(Number(z), Number(x), Number(y))
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)
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properties[layer] = count.count
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if (count.count !== 0) {
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latSum += count.lat * count.count
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lonSum += count.lon * count.count
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sum += count.count
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}
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}
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properties["lon"] = lonSum / sum
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properties["lat"] = latSum / sum
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return JSON.stringify({ ...properties, total: sum })
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},
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},
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])
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console.log("Started server on port", port)
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console.log(
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">>>",
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await tcs.getCount("drinking_water", [
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[3.194358020772171, 51.228073636083394],
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[3.2839964396059145, 51.172701162680994],
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])
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)
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}
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}
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new TileCountServer().run()
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