245 lines
7.9 KiB
TypeScript
245 lines
7.9 KiB
TypeScript
import { Client } from "pg"
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import http from "node:http"
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import { Tiles } from "../../src/Models/TileRange"
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/**
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* Just the OSM2PGSL default database
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*/
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interface PoiDatabaseMeta {
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attributes
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current_timestamp
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db_format
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flat_node_file
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import_timestamp
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output
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prefix
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replication_base_url
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replication_sequence_number
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replication_timestamp
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style
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updatable
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version
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}
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/**
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* Connects with a Postgis database, gives back how much items there are within the given BBOX
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*/
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class OsmPoiDatabase {
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private static readonly prefixes: ReadonlyArray<string> = ["pois", "lines", "polygons"]
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private readonly _client: Client
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private isConnected = false
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private supportedLayers: Set<string> = undefined
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private metaCache: PoiDatabaseMeta = undefined
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private metaCacheDate: Date = undefined
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constructor(connectionString: string) {
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this._client = new Client(connectionString)
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}
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async getCount(
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layer: string,
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bbox: [[number, number], [number, number]] = undefined
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): Promise<number> {
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if (!this.isConnected) {
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await this._client.connect()
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this.isConnected = true
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}
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let total = 0
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for (const prefix of OsmPoiDatabase.prefixes) {
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let query = "SELECT COUNT(*) FROM " + prefix + "_" + layer
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if (bbox) {
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query += ` WHERE ST_MakeEnvelope (${bbox[0][0]}, ${bbox[0][1]}, ${bbox[1][0]}, ${bbox[1][1]}, 4326) ~ geom`
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}
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console.log("Query:", query)
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const result = await this._client.query(query)
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total += Number(result.rows[0].count)
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}
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return total
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}
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disconnect() {
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this._client.end()
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}
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async getLayers(): Promise<Set<string>> {
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if (this.supportedLayers !== undefined) {
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return this.supportedLayers
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}
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const result = await this._client.query(
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"SELECT table_name \n" +
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"FROM information_schema.tables \n" +
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"WHERE table_schema = 'public' AND table_name LIKE 'lines_%';"
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)
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const layers = result.rows.map((r) => r.table_name.substring("lines_".length))
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this.supportedLayers = new Set(layers)
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return this.supportedLayers
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}
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async getMeta(): Promise<PoiDatabaseMeta> {
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const now = new Date()
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if (this.metaCache !== undefined) {
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const diffSec = (this.metaCacheDate.getTime() - now.getTime()) / 1000
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if (diffSec < 120) {
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return this.metaCache
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}
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}
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const result = await this._client.query("SELECT * FROM public.osm2pgsql_properties")
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const meta = {}
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for (const { property, value } of result.rows) {
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meta[property] = value
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}
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this.metaCacheDate = now
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this.metaCache = <any>meta
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return this.metaCache
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}
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}
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class Server {
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constructor(
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port: number,
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handle: {
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mustMatch: string | RegExp
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mimetype: string
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handle: (path: string) => Promise<string>
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}[]
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) {
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handle.push({
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mustMatch: "",
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mimetype: "text/html",
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handle: async () => {
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return `<html><body>Supported endpoints are <ul>${handle
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.filter((h) => h.mustMatch !== "")
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.map((h) => {
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let l = h.mustMatch
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if (typeof h.mustMatch === "string") {
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l = `<a href='${l}'>${l}</a>`
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}
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return "<li>" + l + "</li>"
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})
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.join("")}</ul></body></html>`
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},
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})
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http.createServer(async (req: http.IncomingMessage, res) => {
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try {
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console.log(
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req.method + " " + req.url,
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"from:",
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req.headers.origin,
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new Date().toISOString()
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)
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const url = new URL(`http://127.0.0.1/` + req.url)
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let path = url.pathname
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while (path.startsWith("/")) {
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path = path.substring(1)
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}
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const handler = handle.find((h) => {
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if (typeof h.mustMatch === "string") {
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return h.mustMatch === path
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}
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if (path.match(h.mustMatch)) {
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return true
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}
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})
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if (handler === undefined || handler === null) {
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res.writeHead(404, { "Content-Type": "text/html" })
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res.write("<html><body><p>Not found...</p></body></html>")
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res.end()
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return
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}
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res.setHeader(
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"Access-Control-Allow-Headers",
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"Origin, X-Requested-With, Content-Type, Accept"
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)
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res.setHeader("Access-Control-Allow-Origin", req.headers.origin ?? "*")
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if (req.method === "OPTIONS") {
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res.setHeader(
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"Access-Control-Allow-Methods",
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"POST, GET, OPTIONS, DELETE, UPDATE"
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)
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res.writeHead(204, { "Content-Type": handler.mimetype })
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res.end()
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return
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}
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if (req.method === "POST" || req.method === "UPDATE") {
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return
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}
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if (req.method === "DELETE") {
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return
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}
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try {
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const result = await handler.handle(path)
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res.writeHead(200, { "Content-Type": handler.mimetype })
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res.write(result)
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res.end()
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} catch (e) {
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console.error("Could not handle request:", e)
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res.writeHead(500)
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res.write(e)
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res.end()
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}
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} catch (e) {
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console.error("FATAL:", e)
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res.end()
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}
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}).listen(port)
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console.log(
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"Server is running on port " + port,
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". Supported endpoints are: " + handle.map((h) => h.mustMatch).join(", ")
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)
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}
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}
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const connectionString = "postgresql://user:password@localhost:5444/osm-poi"
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const tcs = new OsmPoiDatabase(connectionString)
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const server = new Server(2345, [
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{
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mustMatch: "status.json",
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mimetype: "application/json",
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handle: async (path: string) => {
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const layers = await tcs.getLayers()
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const meta = await tcs.getMeta()
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return JSON.stringify({ meta, 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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console.log("Path is:", path, path.split(".")[0])
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const [layers, z, x, y] = path.split(".")[0].split("/")
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let sum = 0
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let properties: Record<string, number> = {}
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const availableLayers = await tcs.getLayers()
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for (const layer of layers.split("+")) {
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console.log("Getting layer", layer)
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if (!availableLayers.has(layer)) {
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continue
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}
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const count = await tcs.getCount(
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layer,
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Tiles.tile_bounds_lon_lat(Number(z), Number(x), Number(y))
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)
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properties[layer] = count
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sum += count
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}
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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(
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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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