Madison Grubb
aa8a0bd83f
Ingest aircraft and vessel tracks via OSINT feeds and tactical CoT, expose viewport-filtered SSE to the map, and add an OSM ALPR layer with tiled caching and performant marker sync.
71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
/** SSE subscriber registry; bbox union drives OSINT feeds. */
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import { getActiveEntitiesInBbox } from './cotStore.js'
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import { isInBbox, matchesLayerFilter, unionBboxes } from './cotEntityUtils.js'
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/** @typedef {{ west: number, south: number, east: number, north: number }} Bbox */
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/** @typedef {(event: string, data: string) => Promise<void> | void} PushFn */
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/** @type {Map<string, { bbox: Bbox | null, layers: Set<string>, push: PushFn }>} */
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const subscribers = new Map()
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let nextId = 1
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/**
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* @param {{ bbox: Bbox | null, layers: Set<string>, push: PushFn }} sub
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* @returns {() => void} Unregister function.
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*/
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export function registerSubscriber(sub) {
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const id = String(nextId++)
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subscribers.set(id, sub)
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return () => subscribers.delete(id)
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}
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/** @returns {Bbox | null} Union of all subscriber bboxes. */
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export function getSubscriberBboxUnion() {
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return unionBboxes([...subscribers.values()].map(s => s.bbox))
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}
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export function getSubscriberCount() {
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return subscribers.size
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}
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export function clearSubscribers() {
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subscribers.clear()
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}
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export async function notifySubscribersForEntity(event, payload, entity) {
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const data = JSON.stringify(payload)
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const tasks = []
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for (const sub of subscribers.values()) {
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if (sub.bbox && !isInBbox(entity, sub.bbox)) continue
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if (!matchesLayerFilter(sub.layers, entity)) continue
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tasks.push(Promise.resolve(sub.push(event, data)))
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}
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await Promise.all(tasks)
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}
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export async function notifySubscribersRemove(id) {
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const data = JSON.stringify({ id })
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await Promise.all(
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[...subscribers.values()].map(sub => Promise.resolve(sub.push('remove', data))),
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)
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}
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/**
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* Push a filtered snapshot to each active SSE subscriber.
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* @param {{ ttlMs?: number, osintTtlMs?: number, takFilterBbox?: boolean, maxEntities?: number }} snapshotOpts
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*/
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export async function broadcastSubscriberSnapshots(snapshotOpts) {
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const tasks = []
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for (const sub of subscribers.values()) {
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tasks.push((async () => {
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const entities = await getActiveEntitiesInBbox(sub.bbox, {
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...snapshotOpts,
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layers: sub.layers,
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})
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await sub.push('snapshot', JSON.stringify({ entities }))
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})())
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}
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await Promise.all(tasks)
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}
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