julian
59bfe2013f
Replace the hardcoded lane: 0 on input_received events with a real device->lane lookup. A new LaneMap caches lane_devices.id -> lane, built at startup and refreshed by the setup routes on assign/unassign. An unmapped device logs lane: -1 + a warning (0 is a real lane) and is still recorded faithfully (append-only chain). source stays null for raw inputs by design: it's an IdentitySource (how a vehicle was identified), not a device field; device provenance remains in identity. Documented both in the wiki.
31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
import { laneDevices, type Db } from "@parking/db";
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// Resolves a device instance id (lane_devices.id) to its lane number.
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//
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// Device pushes/events carry the `lane_devices` id (which device fired), not a
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// lane. The event log wants the lane, so we keep a small in-memory id->lane map
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// rebuilt from the DB at startup and refreshed whenever assignments change
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// (assign/unassign). It's tiny (one row per device) and read on the hot path of
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// every input event, so a cached map beats a per-event DB lookup.
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export class LaneMap {
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readonly #db: Db;
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#byDeviceId = new Map<string, number>();
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constructor(db: Db) {
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this.#db = db;
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}
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/** (Re)load the id->lane map from the lane_devices table. */
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refresh(): void {
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const rows = this.#db.select().from(laneDevices).all();
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const next = new Map<string, number>();
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for (const r of rows) next.set(r.id, r.lane);
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this.#byDeviceId = next;
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}
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/** Lane for a device instance id, or null if the device isn't known. */
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laneFor(deviceId: string): number | null {
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return this.#byDeviceId.get(deviceId) ?? null;
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}
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}
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