mirror of
https://github.com/bilawalsidhu/gods-eye-view.git
synced 2026-11-04 02:14:01 +00:00
0251c74109
Wind (NOAA GFS and ECMWF IFS: animated particles, colour field, a reading at map centre), observed weather (NOAA MRMS radar, GOES and NESDIS infrared clouds, lightning density) on one shared history timeline, NHC and CPHC cyclone advisories with tracks and cones, and a WEATHER panel in the right rail. On 3D Tiles the observed products render as raised shells with a sharper window around the view. Co-authored-by: Gustavo Beneduzi <[email protected]> Co-authored-by: Daniel Slay <[email protected]> Co-authored-by: Rehaan Delmotra <[email protected]> Co-authored-by: Cursor Agent <[email protected]>
611 lines
21 KiB
JavaScript
611 lines
21 KiB
JavaScript
import { readResponseTextCapped } from './common/http.js';
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import { readWindBody as readBytesCapped } from '../../src/sources/windBody.js';
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const BASE = 'https://nowcoast.noaa.gov/geoserver/observations/';
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const HOUR = 3600_000;
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const PRODUCTS = Object.freeze({
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lightning: Object.freeze({
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service: 'lightning_detection',
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layer: 'ldn_lightning_strike_density',
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style: 'lightning_density',
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title: 'Lightning density · 15 min',
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coverage:
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'Pacific and Americas: 110°E across the dateline to 0°, 25°S–80°N; not global coverage.',
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description:
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'Observed 15-minute lightning strike density on an approximately 8 km grid, scaled as strikes/km²/min ×10³. Ground-network density, not individual GLM flashes.',
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attribution: 'NOAA/NWS nowCOAST; derived from Vaisala NLDN/GLD360',
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metadataTtlMs: 600_000,
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image: Object.freeze({ width: 4096, height: 2048 }),
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}),
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radar: Object.freeze({
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service: 'weather_radar',
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layer: 'conus_base_reflectivity_mosaic',
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style: 'weather_radar_base_reflectivity',
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title: 'CONUS radar reflectivity',
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coverage:
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'Contiguous United States; gaps do not establish absence of precipitation.',
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description:
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'Observed MRMS radar base reflectivity (dBZ), approximately 1 km and 4-minute updates; not a rainfall forecast.',
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image: Object.freeze({ width: 4096, height: 2048 }),
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}),
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clouds: Object.freeze({
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service: 'satellite',
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layer: 'global_longwave_imagery_mosaic',
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style: 'reflectance',
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title: 'Global satellite infrared',
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coverage:
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'Global mosaic with incomplete polar coverage; nominal coverage 60°S–60°N.',
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description:
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'Longwave infrared cloud and land/sea temperature patterns, approximately 3 km; hourly updates with 2–3 hour source latency. Not a cloud-only mask.',
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image: Object.freeze({ width: 2048, height: 1024 }),
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}),
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'clouds-regional': Object.freeze({
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service: 'satellite',
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layer: 'goes_longwave_imagery',
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style: 'goes-lir',
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title: 'GOES regional satellite infrared',
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coverage:
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'GOES East/West regional North American coverage; not a global image.',
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description:
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'GOES-19/18 longwave infrared Band 14 cloud and surface temperature patterns, approximately 2 km and 5-minute updates. Not a cloud-only mask.',
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image: Object.freeze({ width: 4096, height: 2048 }),
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}),
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});
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// Whole-extent images: 2:1 sizes up to each product's largest (the default).
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const IMAGE_SIZES = Object.freeze(['1024x512', '2048x1024', '4096x2048']);
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// Detail windows: any product up to 4096×2048 (the default).
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const DETAIL_IMAGE = Object.freeze({ width: 4096, height: 2048 });
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const BBOX_STEP = 0.25;
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const MAX_IMAGE_BYTES = 16 * 1024 * 1024;
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function failure(code, status = 503) {
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return Object.assign(new Error(code), { code, status });
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}
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/** Canonicalize only explicit UTC observations; never expand time intervals. */
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function observationTime(value) {
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if (
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typeof value !== 'string' ||
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!/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d{3})?Z$/.test(value)
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)
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return null;
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const date = new Date(value);
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if (!Number.isFinite(date.getTime())) return null;
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const canonical = date.toISOString();
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return canonical.replace('.000Z', 'Z') === value.replace('.000Z', 'Z')
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? canonical
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: null;
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}
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/** Read the named leaf from bounded capabilities without resolving XML entities. */
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export function parseWeatherCapabilities(xml, product, nowMs = Date.now()) {
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const spec = PRODUCTS[product];
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if (
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!spec ||
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typeof xml !== 'string' ||
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xml.length > 512 * 1024 ||
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/<!DOCTYPE|<!ENTITY/i.test(xml)
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)
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throw failure('invalid_weather_metadata');
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const stack = [];
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let leaf = null;
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let tags = 0;
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for (const match of xml.matchAll(/<\/?(?:[\w.-]+:)?Layer\b[^>]*>/g)) {
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if (++tags > 2048) throw failure('invalid_weather_metadata');
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if (!match[0].startsWith('</')) {
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if (stack.length) stack.at(-1).nested = true;
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if (stack.length >= 16 || match[0].endsWith('/>'))
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throw failure('invalid_weather_metadata');
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stack.push({ start: match.index + match[0].length, nested: false });
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} else {
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const opened = stack.pop();
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if (!opened) throw failure('invalid_weather_metadata');
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if (opened.nested) continue;
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const candidate = xml.slice(opened.start, match.index);
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const name = candidate
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.match(/<(?:[\w.-]+:)?Name\s*>([^<]+)<\/(?:[\w.-]+:)?Name>/)?.[1]
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?.trim();
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if (name === spec.layer) {
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if (leaf !== null) throw failure('invalid_weather_metadata');
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leaf = candidate;
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}
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}
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}
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if (stack.length || !leaf) throw failure('invalid_weather_metadata');
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const box = leaf.match(
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/<(?:[\w.-]+:)?EX_GeographicBoundingBox\s*>([\s\S]*?)<\/(?:[\w.-]+:)?EX_GeographicBoundingBox>/,
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)?.[1];
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const bounds = {};
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for (const [key, tag] of Object.entries({
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west: 'westBoundLongitude',
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south: 'southBoundLatitude',
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east: 'eastBoundLongitude',
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north: 'northBoundLatitude',
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})) {
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const value = box
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?.match(
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new RegExp(`<(?:[\\w.-]+:)?${tag}\\s*>([^<]+)</(?:[\\w.-]+:)?${tag}>`),
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)?.[1]
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?.trim();
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bounds[key] = value ? Number(value) : NaN;
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}
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if (
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!Object.values(bounds).every(Number.isFinite) ||
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bounds.west < -180 ||
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bounds.east > 180 ||
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bounds.south < -90 ||
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bounds.north > 90 ||
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bounds.west >= bounds.east ||
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bounds.south >= bounds.north
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)
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throw failure('invalid_weather_metadata');
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const dimensions = [
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...leaf.matchAll(
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/<(?:[\w.-]+:)?Dimension\b([^>]*)>([^<]*)<\/(?:[\w.-]+:)?Dimension>/g,
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),
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].filter((entry) => /\bname\s*=\s*["']time["']/.test(entry[1]));
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if (
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dimensions.length !== 1 ||
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!/\bunits\s*=\s*["']ISO8601["']/.test(dimensions[0][1])
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)
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throw failure('invalid_weather_metadata');
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const raw = dimensions[0][2].trim().split(',');
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if (!raw.length || raw.length > 512)
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throw failure('invalid_weather_metadata');
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const times = raw.map((value) => observationTime(value.trim()));
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if (times.some((value) => !value || Date.parse(value) > nowMs + 5 * 60_000))
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throw failure('invalid_weather_metadata');
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const defaultTime = observationTime(
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dimensions[0][1].match(/\bdefault\s*=\s*["']([^"']+)["']/)?.[1],
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);
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if (!defaultTime || !times.includes(defaultTime))
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throw failure('invalid_weather_metadata');
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const recent = [...new Set(times)]
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.filter((value) => nowMs - Date.parse(value) <= 24 * HOUR)
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.sort()
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.slice(-26);
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if (!recent.length) throw failure('weather_observations_expired');
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return { bounds, times: recent.slice(-13), allowedTimes: recent };
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}
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/** A detail window `west,south,east,north` in degrees, rounded to 0.25° so cache
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* keys repeat, with a 2:1 aspect within 1 %; null when absent. Containment in
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* the product bounds is checked once the metadata is known. */
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export function weatherImageBbox(value) {
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if (value === null) return null;
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const parts = value.split(',');
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if (
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parts.length !== 4 ||
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parts.some((part) => !/^-?\d{1,3}(?:\.\d{1,6})?$/.test(part))
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)
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throw failure('invalid_weather_bbox', 400);
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// `+ 0` turns a rounded -0 into 0 so equal windows share one key.
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const [west, south, east, north] = parts.map(
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(part) => Math.round(Number(part) / BBOX_STEP) * BBOX_STEP + 0,
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);
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if (
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west < -180 ||
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east > 180 ||
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south < -90 ||
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north > 90 ||
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west >= east ||
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south >= north ||
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Math.abs((east - west) / (north - south) / 2 - 1) > 0.01
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)
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throw failure('invalid_weather_bbox', 400);
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return [west, south, east, north];
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}
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/** GeographicTilingScheme's two longitude tiles and one latitude tile at level zero. */
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export function weatherTileBounds(z, x, y) {
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if (
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![z, x, y].every(Number.isInteger) ||
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z < 0 ||
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z > 6 ||
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x < 0 ||
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y < 0 ||
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x >= 2 ** (z + 1) ||
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y >= 2 ** z
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)
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throw failure('invalid_weather_tile', 400);
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const span = 180 / 2 ** z;
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return [
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-180 + x * span,
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90 - (y + 1) * span,
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-180 + (x + 1) * span,
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90 - y * span,
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];
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}
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function validatePng(bytes, width, height) {
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const buffer = Buffer.from(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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if (
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buffer.length < 33 ||
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!buffer
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.subarray(0, 8)
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.equals(Buffer.from([137, 80, 78, 71, 13, 10, 26, 10])) ||
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buffer.readUInt32BE(8) !== 13 ||
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buffer.toString('ascii', 12, 16) !== 'IHDR' ||
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buffer.readUInt32BE(16) !== width ||
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buffer.readUInt32BE(20) !== height
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)
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throw failure('invalid_weather_image');
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return buffer;
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}
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/** Fixed NOAA observed-weather metadata and WMS tiles; no client-supplied destinations. */
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export function weatherProxy({
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fetchImpl = fetch,
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now = () => Date.now(),
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timeoutMs = 12_000,
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} = {}) {
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const metadata = new Map();
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const attempts = new Map();
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const operations = new Map();
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const pending = [];
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const tiles = new Map();
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const tileFailures = new Map();
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let tileBytes = 0;
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let active = 0;
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function pump() {
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while (active < 8 && pending.length) {
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const operation = pending.shift();
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if (operation.controller.signal.aborted) continue;
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active++;
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operation.started = true;
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Promise.resolve()
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.then(() => operation.work(operation.controller.signal))
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.then(operation.resolve, operation.reject)
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.finally(() => {
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active--;
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pump();
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});
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}
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}
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async function shared(key, work, clientSignal) {
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clientSignal.throwIfAborted();
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let operation = operations.get(key);
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if (operation?.controller.signal.aborted) {
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operations.delete(key);
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operation = null;
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}
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if (!operation) {
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if (operations.size >= 120 || pending.length >= 96)
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throw failure('weather_busy', 429);
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const controller = new AbortController();
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operation = { controller, work, waiters: 0, started: false };
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operation.promise = new Promise((resolve, reject) => {
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operation.resolve = resolve;
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operation.reject = reject;
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});
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const cancel = () => {
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const index = pending.indexOf(operation);
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if (index >= 0) pending.splice(index, 1);
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operation.reject(failure('weather_request_cancelled'));
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};
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controller.signal.addEventListener('abort', cancel, { once: true });
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const timer = setTimeout(() => controller.abort(), timeoutMs);
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operation.promise = operation.promise.finally(() => {
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clearTimeout(timer);
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controller.signal.removeEventListener('abort', cancel);
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if (operations.get(key) === operation) operations.delete(key);
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});
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operations.set(key, operation);
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pending.push(operation);
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pump();
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}
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operation.waiters++;
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const abort = () => {
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if (--operation.waiters === 0) operation.controller.abort();
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};
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clientSignal.addEventListener('abort', abort, { once: true });
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try {
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const value = await operation.promise;
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clientSignal.throwIfAborted();
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return value;
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} finally {
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clientSignal.removeEventListener('abort', abort);
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if (!clientSignal.aborted) operation.waiters--;
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}
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}
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async function upstream(url, signal, image = null) {
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signal.throwIfAborted();
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const response = await fetchImpl(url, {
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signal,
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redirect: 'error',
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headers: { Accept: image ? 'image/png' : 'application/xml,text/xml' },
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});
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if (
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!response.ok ||
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(image &&
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!/^image\/png(?:;|$)/i.test(response.headers.get('content-type') || ''))
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) {
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await response.body?.cancel();
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throw failure('weather_upstream_unavailable');
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}
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const value = image
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? validatePng(
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await readBytesCapped(response, image.maxBytes, signal),
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image.width,
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image.height,
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)
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: await readResponseTextCapped(response, 512 * 1024, signal);
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signal.throwIfAborted();
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return value;
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}
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async function getMetadata(product, signal) {
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signal.throwIfAborted();
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const old = metadata.get(product);
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const spec = PRODUCTS[product];
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if (old && now() - old.fetchedAt < (spec.metadataTtlMs ?? 120_000))
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return { ...old, stale: false };
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try {
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if (
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now() - (attempts.get(product) ?? -Infinity) < 30_000 &&
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!operations.has(`metadata:${spec.service}`)
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)
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throw failure('weather_upstream_unavailable');
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attempts.set(product, now());
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const url = `${BASE}${spec.service}/ows?service=WMS&version=1.3.0&request=GetCapabilities`;
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const xml = await shared(
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`metadata:${spec.service}`,
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(activeSignal) => upstream(url, activeSignal),
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signal,
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);
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const value = {
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...parseWeatherCapabilities(xml, product, now()),
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fetchedAt: now(),
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};
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metadata.set(product, value);
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return { ...value, stale: false };
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} catch (error) {
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if (signal.aborted) attempts.delete(product);
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signal.throwIfAborted();
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if (error.status === 429) throw error;
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if (old && now() - old.fetchedAt <= HOUR) return { ...old, stale: true };
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throw failure('weather_metadata_unavailable');
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}
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}
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function rememberTile(key, bytes) {
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if (tiles.has(key)) tileBytes -= tiles.get(key).bytes.length;
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tiles.delete(key);
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while (tiles.size >= 128 || tileBytes + bytes.length > 16 * 1024 * 1024) {
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const oldest = tiles.keys().next().value;
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tileBytes -= tiles.get(oldest).bytes.length;
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tiles.delete(oldest);
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}
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tiles.set(key, { bytes, at: now() });
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tileBytes += bytes.length;
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}
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function describe(product, value) {
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const spec = PRODUCTS[product];
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const time = value?.times.at(-1) ?? null;
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return {
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schemaVersion: 1,
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product,
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title: spec.title,
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coverage: spec.coverage,
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description: spec.description,
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source: 'NOAA nowCOAST',
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attribution: spec.attribution ?? 'NOAA/NWS/NESDIS nowCOAST',
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bounds: value?.bounds ?? null,
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times: value?.times ?? [],
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latest: time,
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time,
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observedAt: time,
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fetchedAt: value?.fetchedAt ?? null,
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stale: value?.stale ?? true,
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unavailable: !value,
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reason: !value
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? 'Weather imagery unavailable'
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: value.stale
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? 'Cached weather metadata; upstream unavailable'
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: null,
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tileSize: 256,
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maxLevel: 6,
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tilingScheme: 'geographic',
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tileTemplate: time
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? `/api/weather/tile?product=${product}&time=${encodeURIComponent(time)}&z={z}&x={x}&y={y}`
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: null,
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imageUrl: time
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? `/api/weather/image?product=${product}&time=${encodeURIComponent(time)}`
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: null,
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imageSize: { ...spec.image },
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};
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}
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function json(res, status, body) {
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res.writeHead(status, {
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'Content-Type': 'application/json',
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'Cache-Control': 'no-store',
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...(status === 429 ? { 'Retry-After': '2' } : {}),
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});
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res.end(JSON.stringify(body));
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}
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async function handler(req, res) {
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const controller = new AbortController();
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const close = () => controller.abort();
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res.once?.('close', close);
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try {
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const url = new URL(req.url, 'http://localhost');
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if (req.method !== 'GET')
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return json(res, 405, { error: 'method_not_allowed' });
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if (!['/manifest', '/tile', '/image'].includes(url.pathname))
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return json(res, 404, { error: 'not_found' });
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const allowed =
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url.pathname === '/manifest'
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? ['product']
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: url.pathname === '/image'
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? ['product', 'time', 'size', 'bbox']
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: ['product', 'time', 'z', 'x', 'y', 'size'];
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if (
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req.url.length > 512 ||
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[...url.searchParams.keys()].some(
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(key) =>
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!allowed.includes(key) || url.searchParams.getAll(key).length !== 1,
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)
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)
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return json(res, 400, { error: 'invalid_weather_query' });
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const product = url.searchParams.get('product');
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if (!Object.hasOwn(PRODUCTS, product))
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return json(res, 400, { error: 'unknown_weather_product' });
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const wholeImage = url.pathname === '/image';
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const detailBox = wholeImage
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? weatherImageBbox(url.searchParams.get('bbox'))
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: null;
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const largest = detailBox ? DETAIL_IMAGE : PRODUCTS[product].image;
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const size =
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url.searchParams.get('size') ??
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(wholeImage ? `${largest.width}x${largest.height}` : '256');
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if (
|
||
wholeImage
|
||
? !IMAGE_SIZES.includes(size) ||
|
||
Number.parseInt(size, 10) > largest.width
|
||
: !['256', '512', '1024'].includes(size)
|
||
)
|
||
throw failure(
|
||
wholeImage
|
||
? 'invalid_weather_image_size'
|
||
: 'invalid_weather_tile_size',
|
||
400,
|
||
);
|
||
if (url.pathname === '/manifest') {
|
||
try {
|
||
const value = await getMetadata(product, controller.signal);
|
||
controller.signal.throwIfAborted();
|
||
return json(res, 200, describe(product, value));
|
||
} catch (error) {
|
||
if (controller.signal.aborted) return;
|
||
if (error.status === 429) throw error;
|
||
return json(res, 200, describe(product, null));
|
||
}
|
||
}
|
||
const coords = wholeImage
|
||
? null
|
||
: ['z', 'x', 'y'].map((key) => url.searchParams.get(key));
|
||
if (coords?.some((value) => !/^(?:0|[1-9]\d{0,2})$/.test(value ?? '')))
|
||
throw failure('invalid_weather_tile', 400);
|
||
const tileBounds = coords
|
||
? weatherTileBounds(...coords.map(Number))
|
||
: null;
|
||
const time = url.searchParams.get('time');
|
||
if (!time || observationTime(time) !== time)
|
||
throw failure('invalid_weather_time', 400);
|
||
const value = await getMetadata(product, controller.signal);
|
||
controller.signal.throwIfAborted();
|
||
if (
|
||
!value.allowedTimes.includes(time) ||
|
||
now() - Date.parse(time) > 24 * HOUR
|
||
)
|
||
throw failure('unknown_weather_time', 400);
|
||
if (
|
||
detailBox &&
|
||
(detailBox[0] < value.bounds.west ||
|
||
detailBox[1] < value.bounds.south ||
|
||
detailBox[2] > value.bounds.east ||
|
||
detailBox[3] > value.bounds.north)
|
||
)
|
||
throw failure('invalid_weather_bbox', 400);
|
||
// A single advertised extent keeps NOAA's global reflectance contrast
|
||
// consistent across the image; independently normalized tiles create seams.
|
||
const bbox =
|
||
detailBox ??
|
||
(wholeImage
|
||
? [
|
||
value.bounds.west,
|
||
value.bounds.south,
|
||
value.bounds.east,
|
||
value.bounds.north,
|
||
]
|
||
: tileBounds);
|
||
const [width, height] = wholeImage
|
||
? size.split('x').map(Number)
|
||
: [Number(size), Number(size)];
|
||
const imageShape = {
|
||
width,
|
||
height,
|
||
maxBytes: wholeImage
|
||
? MAX_IMAGE_BYTES
|
||
: Math.max(1024 * 1024, width ** 2 * 4 + 65_536),
|
||
};
|
||
// NOAA WMS capabilities advertise no MaxWidth/MaxHeight. One GetMap
|
||
// returns a whole 4096×2048 extent or window, or a 1024 px tile, without
|
||
// composition. Images are keyed by product, time, size and bbox.
|
||
const key = `${product}:${time}:${wholeImage ? `image:${size}:${bbox.join(',')}` : `tile:${size}:${coords.join('/')}`}`;
|
||
let cached = tiles.get(key);
|
||
if (cached && now() - cached.at <= 24 * HOUR) {
|
||
tiles.delete(key);
|
||
tiles.set(key, cached);
|
||
} else {
|
||
// Never ask nearestValue=1 WMS to silently replace an expired frame.
|
||
if (value.stale) throw failure('weather_metadata_stale');
|
||
if (now() - (tileFailures.get(key) ?? -Infinity) < 30_000)
|
||
throw failure('weather_upstream_unavailable');
|
||
const spec = PRODUCTS[product];
|
||
const upstreamUrl = new URL(`${BASE}${spec.service}/ows`);
|
||
upstreamUrl.search = new URLSearchParams({
|
||
service: 'WMS',
|
||
version: '1.1.1',
|
||
request: 'GetMap',
|
||
layers: spec.layer,
|
||
styles: spec.style,
|
||
srs: 'EPSG:4326',
|
||
bbox: bbox.join(','),
|
||
width: String(imageShape.width),
|
||
height: String(imageShape.height),
|
||
format: 'image/png',
|
||
transparent: 'true',
|
||
time,
|
||
}).toString();
|
||
try {
|
||
const bytes = await shared(
|
||
`image:${key}`,
|
||
(signal) => upstream(upstreamUrl.href, signal, imageShape),
|
||
controller.signal,
|
||
);
|
||
rememberTile(key, bytes);
|
||
cached = { bytes };
|
||
} catch (error) {
|
||
if (!controller.signal.aborted && error.status !== 429) {
|
||
tileFailures.delete(key);
|
||
tileFailures.set(key, now());
|
||
while (tileFailures.size > 128)
|
||
tileFailures.delete(tileFailures.keys().next().value);
|
||
}
|
||
throw error;
|
||
}
|
||
}
|
||
res.writeHead(200, {
|
||
'Content-Type': 'image/png',
|
||
'Cache-Control': 'public, max-age=86400, immutable',
|
||
'X-Content-Type-Options': 'nosniff',
|
||
});
|
||
res.end(cached.bytes);
|
||
} catch (error) {
|
||
if (!controller.signal.aborted)
|
||
json(
|
||
res,
|
||
error.status === 400 || error.status === 429 ? error.status : 503,
|
||
{
|
||
error:
|
||
error.status === 400 || error.status === 429
|
||
? error.code
|
||
: 'weather_upstream_unavailable',
|
||
},
|
||
);
|
||
} finally {
|
||
res.removeListener?.('close', close);
|
||
}
|
||
}
|
||
return {
|
||
name: 'weather',
|
||
configureServer({ middlewares }) {
|
||
middlewares.use('/api/weather', handler);
|
||
},
|
||
configurePreviewServer({ middlewares }) {
|
||
middlewares.use('/api/weather', handler);
|
||
},
|
||
};
|
||
}
|