97 lines
3.6 KiB
TypeScript
97 lines
3.6 KiB
TypeScript
import { z } from "zod";
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import * as trpcNext from "@calcom/trpc/server/adapters/next";
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import { createContext as createTrpcContext } from "@calcom/trpc/server/createContext";
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import type { AnyRouter } from "@trpc/server";
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/**
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* Creates an API handler executed by Next.js.
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*/
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export function createNextApiHandler(router: AnyRouter, isPublic = false, namespace = "") {
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return trpcNext.createNextApiHandler({
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router,
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/**
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* @link https://trpc.io/docs/context
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*/
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createContext: ({ req, res }) => {
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return createTrpcContext({ req, res });
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},
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/**
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* @link https://trpc.io/docs/error-handling
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*/
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onError({ error }) {
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if (error.code === "INTERNAL_SERVER_ERROR") {
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// send to bug reporting
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console.error("Something went wrong", error);
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}
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},
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/**
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* Enable query batching
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*/
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batching: {
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enabled: true,
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},
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/**
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* @link https://trpc.io/docs/caching#api-response-caching
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*/
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responseMeta({ ctx, paths, type, errors }) {
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const allOk = errors.length === 0;
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const isQuery = type === "query";
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const noHeaders = {};
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// We cannot set headers on SSG queries
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if (!ctx?.res) return noHeaders;
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const defaultHeaders: Record<"headers", Record<string, string>> = {
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headers: {},
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};
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const timezone = z.string().safeParse(ctx.req?.headers["x-vercel-ip-timezone"]);
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if (timezone.success) defaultHeaders.headers["x-cal-timezone"] = timezone.data;
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// We need all these conditions to be true to set cache headers
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if (!(isPublic && allOk && isQuery)) return defaultHeaders;
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// No cache by default
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defaultHeaders.headers["cache-control"] = `no-cache`;
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if (isPublic && paths) {
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const ONE_DAY_IN_SECONDS = 60 * 60 * 24;
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const FIVE_MINUTES_IN_SECONDS = 5 * 60;
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const ONE_YEAR_IN_SECONDS = 31536000;
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const cacheRules = {
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session: "no-cache",
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i18n: process.env.NODE_ENV === "development" ? "no-cache" : `max-age=${ONE_YEAR_IN_SECONDS}`,
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// FIXME: Using `max-age=1, stale-while-revalidate=60` fails some booking tests.
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"slots.getSchedule": `no-cache`,
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// Timezones are hardly updated. No need to burden the servers with requests for this by keeping low max-age.
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// Keep it cached for a day and then give it 60 seconds more at most to be updated.
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cityTimezones: `max-age=${ONE_DAY_IN_SECONDS}, stale-while-revalidate=60`,
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// Feature Flags change but it might be okay to have a 5 minute cache to avoid burdening the servers with requests for this.
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// Note that feature flags can be used to quickly kill a feature if it's not working as expected. So, we have to keep fresh time lesser than the deployment time atleast
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"features.map": `max-age=${FIVE_MINUTES_IN_SECONDS}, stale-while-revalidate=60`, // "map" - Feature Flag Map
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} as const;
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const prependNamespace = (key: string) =>
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(namespace ? `${namespace}.${key}` : key) as keyof typeof cacheRules;
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const matchedPath = paths.find((v) => prependNamespace(v) in cacheRules);
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if (matchedPath) {
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const cacheRule = cacheRules[prependNamespace(matchedPath)];
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// We must set cdn-cache-control as well to ensure that Vercel doesn't strip stale-while-revalidate
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// https://vercel.com/docs/concepts/edge-network/caching#:~:text=If%20you%20set,in%20the%20response.
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defaultHeaders.headers["cache-control"] = defaultHeaders.headers["cdn-cache-control"] = cacheRule;
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}
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}
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return defaultHeaders;
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},
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});
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}
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