72 lines
2.2 KiB
JavaScript
72 lines
2.2 KiB
JavaScript
/**
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* In-memory CoT entity store: upsert by id, prune on read by TTL.
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* Single source of truth; getActiveEntities returns new objects (no mutation of returned refs).
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*/
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import { acquire } from './asyncLock.js'
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import { COT_ENTITY_TTL_MS } from './constants.js'
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const entities = new Map()
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/**
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* Upsert entity by id. Input is not mutated; stored value is a new object.
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* @param {{ id: string, lat: number, lng: number, label?: string, eventType?: string, type?: string }} parsed
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*/
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export async function updateFromCot(parsed) {
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if (!parsed || typeof parsed.id !== 'string') return
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const lat = Number(parsed.lat)
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const lng = Number(parsed.lng)
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if (!Number.isFinite(lat) || !Number.isFinite(lng)) return
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await acquire(`cot-${parsed.id}`, async () => {
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const now = Date.now()
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const existing = entities.get(parsed.id)
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const label = typeof parsed.label === 'string' ? parsed.label : (existing?.label ?? parsed.id)
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const type = typeof parsed.eventType === 'string' ? parsed.eventType : (typeof parsed.type === 'string' ? parsed.type : (existing?.type ?? ''))
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entities.set(parsed.id, {
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id: parsed.id,
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lat,
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lng,
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label,
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type,
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updatedAt: now,
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})
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})
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}
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/**
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* Active entities (updated within ttlMs). Prunes expired. Returns new array of new objects.
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* @param {number} [ttlMs]
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* @returns {Promise<Array<{ id: string, lat: number, lng: number, label: string, type: string, updatedAt: number }>>} Snapshot of active entities.
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*/
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export async function getActiveEntities(ttlMs = COT_ENTITY_TTL_MS) {
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return acquire('cot-prune', async () => {
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const now = Date.now()
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const active = []
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const expired = []
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for (const entity of entities.values()) {
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if (now - entity.updatedAt <= ttlMs) {
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active.push({
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id: entity.id,
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lat: entity.lat,
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lng: entity.lng,
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label: entity.label ?? entity.id,
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type: entity.type ?? '',
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updatedAt: entity.updatedAt,
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})
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}
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else {
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expired.push(entity.id)
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}
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}
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for (const id of expired) entities.delete(id)
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return active
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})
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}
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/** Clear store (tests only). */
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export function clearCotStore() {
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entities.clear()
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}
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