101 lines
2.7 KiB
TypeScript
101 lines
2.7 KiB
TypeScript
import { NextRequest, NextResponse } from "next/server";
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import { sql } from "@/lib/db";
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import { fetchIsochrone } from "@/lib/valhalla";
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import { getValhallaQueue } from "@/lib/queue";
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export const runtime = "nodejs";
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const CACHE_TOLERANCE_M = 50;
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export async function POST(req: NextRequest) {
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let body: unknown;
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try {
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body = await req.json();
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} catch {
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return NextResponse.json(
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{ error: "Invalid JSON body", code: "INVALID_BODY" },
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{ status: 400 },
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);
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}
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const { lng, lat, travelMode, contourMinutes } = body as Record<
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string,
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unknown
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>;
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if (typeof lng !== "number" || typeof lat !== "number") {
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return NextResponse.json(
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{ error: "lng and lat must be numbers", code: "INVALID_COORDS" },
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{ status: 400 },
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);
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}
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const contours: number[] = Array.isArray(contourMinutes)
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? (contourMinutes as number[])
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: [5, 10, 15];
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const mode = typeof travelMode === "string" ? travelMode : "walking";
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// Check PostGIS isochrone cache
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const cached = await Promise.resolve(sql<{ result: object }[]>`
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SELECT result
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FROM isochrone_cache
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WHERE travel_mode = ${mode}
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AND contours_min = ${contours}
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AND ST_DWithin(
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origin_geom::geography,
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ST_SetSRID(ST_MakePoint(${lng}, ${lat}), 4326)::geography,
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${CACHE_TOLERANCE_M}
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)
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ORDER BY created_at DESC
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LIMIT 1
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`);
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if (cached.length > 0) {
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return NextResponse.json({ ...cached[0].result, cached: true });
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}
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// Refuse to call valhalla_service while tiles are being rebuilt —
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// the service is stopped during the build and requests would hang or fail.
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const activeValhalla = await getValhallaQueue().getActiveCount();
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if (activeValhalla > 0) {
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return NextResponse.json(
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{ error: "Routing engine is rebuilding, please try again shortly.", code: "VALHALLA_REBUILDING" },
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{ status: 503, headers: { "Retry-After": "60" } },
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);
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}
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// Fetch from local Valhalla
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let geojson: object;
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try {
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geojson = await fetchIsochrone({
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lng,
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lat,
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travelMode: mode,
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contourMinutes: contours,
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polygons: true,
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});
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} catch (err) {
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return NextResponse.json(
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{
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error: "Routing engine unavailable",
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code: "VALHALLA_ERROR",
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detail: err instanceof Error ? err.message : "unknown",
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},
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{ status: 503 },
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);
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}
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// Store in PostGIS cache
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await Promise.resolve(sql`
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INSERT INTO isochrone_cache (origin_geom, travel_mode, contours_min, result)
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VALUES (
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ST_SetSRID(ST_MakePoint(${lng}, ${lat}), 4326),
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${mode},
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${contours},
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${JSON.stringify(geojson)}
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)
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`);
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return NextResponse.json({ ...geojson, cached: false });
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}
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