58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
const VALHALLA_BASE = process.env.VALHALLA_URL ?? "http://valhalla:8002";
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export type ValhallaCosting = "pedestrian" | "bicycle" | "auto";
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const COSTING_MAP: Record<string, ValhallaCosting> = {
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walking: "pedestrian",
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cycling: "bicycle",
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driving: "auto",
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};
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export interface IsochroneOpts {
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lng: number;
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lat: number;
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travelMode: string;
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contourMinutes: number[];
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polygons?: boolean;
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}
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export async function fetchIsochrone(opts: IsochroneOpts): Promise<object> {
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const isTransit = opts.travelMode === "transit";
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const costing = isTransit ? "multimodal" : (COSTING_MAP[opts.travelMode] ?? "pedestrian");
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const body: Record<string, unknown> = {
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locations: [{ lon: opts.lng, lat: opts.lat }],
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costing,
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contours: opts.contourMinutes.map((time) => ({ time })),
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polygons: opts.polygons ?? true,
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show_locations: false,
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};
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if (isTransit) {
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body.costing_options = { transit: { use_bus: 1.0, use_rail: 1.0, use_transfers: 1.0 } };
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body.date_time = { type: 0 }; // current time
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}
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const res = await fetch(`${VALHALLA_BASE}/isochrone`, {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify(body),
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signal: AbortSignal.timeout(30_000),
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});
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if (!res.ok) {
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const text = await res.text();
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throw new Error(`Valhalla error ${res.status}: ${text}`);
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}
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return res.json();
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}
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export async function checkValhalla(): Promise<boolean> {
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try {
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const res = await fetch(`${VALHALLA_BASE}/status`, {
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signal: AbortSignal.timeout(3000),
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});
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return res.ok;
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} catch {
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return false;
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}
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}
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