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app.ts
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app.ts
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import {
App as H3App,
createApp,
createRouter,
eventHandler,
lazyEventHandler,
Router,
toNodeListener,
fetchWithEvent,
H3Error,
isEvent,
H3Event,
} from "h3";
import { createFetch, Headers } from "ofetch";
import destr from "destr";
import {
createCall,
createFetch as createLocalFetch,
} from "unenv/runtime/fetch/index";
import { createHooks, Hookable } from "hookable";
import type { NitroRuntimeHooks, CaptureError } from "./types";
import { useRuntimeConfig } from "./config";
import { cachedEventHandler } from "./cache";
import { normalizeFetchResponse } from "./utils";
import { createRouteRulesHandler, getRouteRulesForPath } from "./route-rules";
import { NitroAsyncContext, nitroAsyncContext } from "./context";
import type { $Fetch, NitroFetchRequest } from "nitropack";
import { plugins } from "#internal/nitro/virtual/plugins";
import errorHandler from "#internal/nitro/virtual/error-handler";
import { handlers } from "#internal/nitro/virtual/server-handlers";
export interface NitroApp {
h3App: H3App;
router: Router;
hooks: Hookable<NitroRuntimeHooks>;
localCall: ReturnType<typeof createCall>;
localFetch: ReturnType<typeof createLocalFetch>;
captureError: CaptureError;
}
function createNitroApp(): NitroApp {
const config = useRuntimeConfig();
const hooks = createHooks<NitroRuntimeHooks>();
const captureError: CaptureError = (error, context = {}) => {
const promise = hooks
.callHookParallel("error", error, context)
.catch((_err) => {
console.error("Error while capturing another error", _err);
});
if (context.event && isEvent(context.event)) {
const errors = context.event.context.nitro?.errors;
if (errors) {
errors.push({ error, context });
}
if (context.event.waitUntil) {
context.event.waitUntil(promise);
}
}
};
const h3App = createApp({
debug: destr(process.env.DEBUG),
onError: (error, event) => {
captureError(error, { event, tags: ["request"] });
return errorHandler(error as H3Error, event);
},
onRequest: async (event) => {
await nitroApp.hooks.callHook("request", event).catch((error) => {
captureError(error, { event, tags: ["request"] });
});
},
onBeforeResponse: async (event, response) => {
await nitroApp.hooks
.callHook("beforeResponse", event, response)
.catch((error) => {
captureError(error, { event, tags: ["request", "response"] });
});
},
onAfterResponse: async (event, response) => {
await nitroApp.hooks
.callHook("afterResponse", event, response)
.catch((error) => {
captureError(error, { event, tags: ["request", "response"] });
});
},
});
const router = createRouter({
preemptive: true,
});
// Create local fetch callers
const localCall = createCall(toNodeListener(h3App) as any);
const _localFetch = createLocalFetch(localCall, globalThis.fetch);
const localFetch: typeof fetch = (input, init) =>
_localFetch(input, init).then((response) =>
normalizeFetchResponse(response)
);
const $fetch = createFetch({
fetch: localFetch,
Headers,
defaults: { baseURL: config.app.baseURL },
});
// @ts-ignore
globalThis.$fetch = $fetch;
// Register route rule handlers
h3App.use(createRouteRulesHandler({ localFetch }));
// A generic event handler give nitro access to the requests
h3App.use(
eventHandler((event) => {
// Init nitro context
event.context.nitro = event.context.nitro || { errors: [] };
// Support platform context provided by local fetch
const envContext: { waitUntil?: H3Event["waitUntil"] } | undefined = (
event.node.req as unknown as { __unenv__: unknown }
)?.__unenv__;
if (envContext) {
Object.assign(event.context, envContext);
}
// Assign bound fetch to context
event.fetch = (req, init) =>
fetchWithEvent(event, req, init, { fetch: localFetch });
event.$fetch = ((req, init) =>
fetchWithEvent(event, req, init as RequestInit, {
fetch: $fetch,
})) as $Fetch<unknown, NitroFetchRequest>;
// https://github.com/unjs/nitro/issues/1420
event.waitUntil = (promise) => {
if (!event.context.nitro._waitUntilPromises) {
event.context.nitro._waitUntilPromises = [];
}
event.context.nitro._waitUntilPromises.push(promise);
if (envContext?.waitUntil) {
envContext.waitUntil(promise);
}
};
event.captureError = (error, context) => {
captureError(error, { event, ...context });
};
})
);
for (const h of handlers) {
let handler = h.lazy ? lazyEventHandler(h.handler) : h.handler;
if (h.middleware || !h.route) {
const middlewareBase = (config.app.baseURL + (h.route || "/")).replace(
/\/+/g,
"/"
);
h3App.use(middlewareBase, handler);
} else {
const routeRules = getRouteRulesForPath(
h.route.replace(/:\w+|\*\*/g, "_")
);
if (routeRules.cache) {
handler = cachedEventHandler(handler, {
group: "nitro/routes",
...routeRules.cache,
});
}
router.use(h.route, handler, h.method);
}
}
h3App.use(config.app.baseURL as string, router.handler);
// Experimental async context support
if (import.meta._asyncContext) {
const _handler = h3App.handler;
h3App.handler = (event) => {
const ctx: NitroAsyncContext = { event };
return nitroAsyncContext.callAsync(ctx, () => _handler(event));
};
}
const app: NitroApp = {
hooks,
h3App,
router,
localCall,
localFetch,
captureError,
};
for (const plugin of plugins) {
try {
plugin(app);
} catch (err) {
captureError(err, { tags: ["plugin"] });
throw err;
}
}
return app;
}
export const nitroApp: NitroApp = createNitroApp();
export const useNitroApp = () => nitroApp;