mapcomplete/scripts/generateCache.ts

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TypeScript
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/**
* Generates a collection of geojson files based on an overpass query for a given theme
*/
import {TileRange, Utils} from "../Utils";
Utils.runningFromConsole = true
import {Overpass} from "../Logic/Osm/Overpass";
import {writeFileSync, existsSync, readFileSync} from "fs";
import {TagsFilter} from "../Logic/Tags/TagsFilter";
import {Or} from "../Logic/Tags/Or";
import LayoutConfig from "../Customizations/JSON/LayoutConfig";
import {AllKnownLayouts} from "../Customizations/AllKnownLayouts";
import ScriptUtils from "./ScriptUtils";
import ExtractRelations from "../Logic/Osm/ExtractRelations";
import * as OsmToGeoJson from "osmtogeojson";
import {Script} from "vm";
function createOverpassObject(theme: LayoutConfig) {
let filters: TagsFilter[] = [];
let extraScripts: string[] = [];
for (const layer of theme.layers) {
if (typeof (layer) === "string") {
throw "A layer was not expanded!"
}
if (layer.doNotDownload) {
continue;
}
if (layer.source.geojsonSource !== undefined) {
// Not our responsibility to download this layer!
continue;
}
// Check if data for this layer has already been loaded
if (layer.source.overpassScript !== undefined) {
extraScripts.push(layer.source.overpassScript)
} else {
filters.push(layer.source.osmTags);
}
}
filters = Utils.NoNull(filters)
extraScripts = Utils.NoNull(extraScripts)
if (filters.length + extraScripts.length === 0) {
throw "Nothing to download! The theme doesn't declare anything to download"
}
return new Overpass(new Or(filters), extraScripts);
}
function saveResponse(chunks: string[], targetDir: string) {
const contents = chunks.join("")
if (contents.startsWith("<?xml")) {
// THis is an error message
console.error("Failed to create ", targetDir, "probably over quota")
return;
}
writeFileSync(targetDir, contents)
}
function rawJsonName(targetDir: string, x: number, y: number, z: number): string {
return targetDir + "_" + z + "_" + x + "_" + y + ".json"
}
function geoJsonName(targetDir: string, x: number, y: number, z: number): string {
return targetDir + "_" + z + "_" + x + "_" + y + ".geojson"
}
function metaJsonName(targetDir: string, x: number, y: number, z: number): string {
return targetDir + "_" + z + "_" + x + "_" + y + ".meta.json"
}
async function downloadRaw(targetdir: string, r: TileRange, overpass: Overpass) {
let downloaded = 0
for (let x = r.xstart; x <= r.xend; x++) {
for (let y = r.ystart; y <= r.yend; y++) {
console.log("x:", (x - r.xstart), "/", (r.xend - r.xstart), "; y:", (y - r.ystart), "/", (r.yend - r.ystart), "; total: ", downloaded, "/", r.total)
downloaded++;
const filename = rawJsonName(targetdir, x, y, r.zoomlevel)
if (existsSync(filename)) {
console.log("Already exists: ", filename)
continue;
}
const boundsArr = Utils.tile_bounds(r.zoomlevel, x, y)
const bounds = {
north: Math.max(boundsArr[0][0], boundsArr[1][0]),
south: Math.min(boundsArr[0][0], boundsArr[1][0]),
east: Math.max(boundsArr[0][1], boundsArr[1][1]),
west: Math.min(boundsArr[0][1], boundsArr[1][1])
}
console.log("Downloading tile", r.zoomlevel, x, y, "with bounds", bounds)
const url = overpass.buildQuery("[bbox:" + bounds.south + "," + bounds.west + "," + bounds.north + "," + bounds.east + "]")
ScriptUtils.DownloadJSON(url,
chunks => {
saveResponse(chunks, filename)
})
await ScriptUtils.sleep(10000)
console.debug("Waking up")
}
}
}
async function postProcess(targetdir: string, r: TileRange) {
let processed = 0;
for (let x = r.xstart; x <= r.xend; x++) {
for (let y = r.ystart; y <= r.yend; y++) {
processed++;
const filename = rawJsonName(targetdir, x, y, r.zoomlevel)
console.log(" Post processing", processed, "/",r. total, filename)
if (!existsSync(filename)) {
throw "Not found - and not downloaded. Run this script again!: " + filename
}
// We read the raw OSM-file and convert it to a geojson
const rawOsm = JSON.parse(readFileSync(filename, "UTF8"))
// Create and save the geojson file - which is the main chunk of the data
const geojson = OsmToGeoJson.default(rawOsm);
writeFileSync(geoJsonName(targetdir, x, y, r.zoomlevel), JSON.stringify(geojson))
// Extract the relationship information
const relations = ExtractRelations.GetRelationElements(rawOsm)
const osmTime = new Date(rawOsm.osm3s.timestamp_osm_base);
const meta = {
freshness: osmTime,
relations: relations
}
writeFileSync(
metaJsonName(targetdir, x, y, r.zoomlevel),
JSON.stringify(meta)
)
}
}
}
async function main(args: string[]) {
if (args.length == 0) {
console.error("Expected arguments are: theme zoomlevel targetdirectory lat0 lon0 lat1 lon1")
return;
}
const themeName = args[0]
const zoomlevel = Number(args[1])
const targetdir = args[2]
const lat0 = Number(args[3])
const lon0 = Number(args[4])
const lat1 = Number(args[5])
const lon1 = Number(args[6])
const tileRange = Utils.TileRangeBetween(zoomlevel, lat0, lon0, lat1, lon1)
const theme = AllKnownLayouts.allKnownLayouts.get(themeName)
if (theme === undefined) {
const keys = []
AllKnownLayouts.allKnownLayouts.forEach((_, key) => {
keys.push(key)
})
console.error("The theme " + theme + " was not found; try one of ", keys);
return
}
const overpass = createOverpassObject(theme)
await downloadRaw(targetdir, tileRange, overpass)
await postProcess(targetdir, tileRange)
}
let args = [...process.argv]
args.splice(0, 2)
main(args);