2569718930@qq.com
60 lines
1.8 KiB
TypeScript
60 lines
1.8 KiB
TypeScript
import { NextRequest } from "next/server";
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import { proxyBackendJsonGet } from "@/lib/api-proxy";
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import { buildCachedJsonResponse } from "@/lib/http-cache";
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import { STATIC_CITY_LIST } from "@/lib/static-cities";
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const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
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const CITIES_CACHE_CONTROL = "public, max-age=0, s-maxage=60, stale-while-revalidate=300";
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const STATIC_CITIES_CACHE_CONTROL =
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"public, max-age=0, s-maxage=300, stale-while-revalidate=3600";
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const CITIES_BACKEND_TIMEOUT_MS = Number(
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process.env.POLYWEATHER_CITIES_BACKEND_TIMEOUT_MS || 1000,
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);
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function staticCitiesFallback(req: NextRequest, reason: string) {
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const response = buildCachedJsonResponse(
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req,
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{
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cities: STATIC_CITY_LIST,
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source: "static_fallback",
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stale: true,
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},
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STATIC_CITIES_CACHE_CONTROL,
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);
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response.headers.set("x-polyweather-cities-source", "static-fallback");
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response.headers.set("x-polyweather-cities-fallback-reason", reason);
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return response;
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}
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export async function GET(req: NextRequest) {
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if (!API_BASE) {
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return staticCitiesFallback(req, "missing-api-base");
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}
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const abortController = new AbortController();
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const timeout = setTimeout(() => abortController.abort(), CITIES_BACKEND_TIMEOUT_MS);
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try {
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const response = await proxyBackendJsonGet(req, {
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cacheControl: CITIES_CACHE_CONTROL,
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publicMessage: "Failed to fetch cities",
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revalidateSeconds: 60,
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signal: abortController.signal,
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statusOnException: 504,
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timeoutPublicMessage: "Cities backend timed out",
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url: `${API_BASE}/api/cities`,
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});
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if (response.status >= 500) {
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return staticCitiesFallback(
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req,
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response.status === 504 ? "backend-timeout" : "backend-error",
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);
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}
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return response;
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} finally {
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clearTimeout(timeout);
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}
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}
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