Initial commit (by create-cloudflare CLI)

cool-dawn-3d3b/node_modules/wrangler/templates/middleware/loader-modules.ts

@@ -0,0 +1,137 @@
+// // This loads all middlewares exposed on the middleware object
+// // and then starts the invocation chain.
+// // The big idea is that we can add these to the middleware export dynamically
+// // through wrangler, or we can potentially let users directly add them as a sort
+// // of "plugin" system.
+
+import {
+	Dispatcher,
+	Middleware,
+	__facade_invoke__,
+	__facade_register__,
+} from "./common";
+
+import worker from "__ENTRY_POINT__";
+
+// We need to preserve all of the exports from the worker
+export * from "__ENTRY_POINT__";
+
+class __Facade_ScheduledController__ implements ScheduledController {
+	#noRetry: ScheduledController["noRetry"];
+
+	constructor(
+		readonly scheduledTime: number,
+		readonly cron: string,
+		noRetry: ScheduledController["noRetry"]
+	) {
+		this.#noRetry = noRetry;
+	}
+
+	noRetry() {
+		if (!(this instanceof __Facade_ScheduledController__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		// Need to call native method immediately in case uncaught error thrown
+		this.#noRetry();
+	}
+}
+
+const __facade_modules_fetch__: ExportedHandlerFetchHandler = function (
+	request,
+	env,
+	ctx
+) {
+	if (worker.fetch === undefined)
+		throw new Error("Handler does not export a fetch() function.");
+	return worker.fetch(request, env, ctx);
+};
+
+function getMaskedEnv(rawEnv: unknown) {
+	let env = rawEnv as Record<string, unknown>;
+	if (worker.envWrappers && worker.envWrappers.length > 0) {
+		for (const wrapFn of worker.envWrappers) {
+			env = wrapFn(env);
+		}
+	}
+	return env;
+}
+
+/**
+ * This type is here to cause a type error if a new export handler is added to
+ * `ExportHandler` without it being included in the `facade` below.
+ */
+type MissingExportHandlers = Omit<
+	Required<ExportedHandler>,
+	"tail" | "trace" | "scheduled" | "queue" | "test" | "email" | "fetch"
+>;
+
+let registeredMiddleware = false;
+
+const facade: ExportedHandler<unknown> & MissingExportHandlers = {
+	...(worker.tail && {
+		tail: maskHandlerEnv(worker.tail),
+	}),
+	...(worker.trace && {
+		trace: maskHandlerEnv(worker.trace),
+	}),
+	...(worker.scheduled && {
+		scheduled: maskHandlerEnv(worker.scheduled),
+	}),
+	...(worker.queue && {
+		queue: maskHandlerEnv(worker.queue),
+	}),
+	...(worker.test && {
+		test: maskHandlerEnv(worker.test),
+	}),
+	...(worker.email && {
+		email: maskHandlerEnv(worker.email),
+	}),
+
+	fetch(request, rawEnv, ctx) {
+		const env = getMaskedEnv(rawEnv);
+		// Get the chain of middleware from the worker object
+		if (worker.middleware && worker.middleware.length > 0) {
+			// Make sure we only register middleware once:
+			// https://github.com/cloudflare/workers-sdk/issues/2386#issuecomment-1614715911
+			if (!registeredMiddleware) {
+				registeredMiddleware = true;
+				for (const middleware of worker.middleware) {
+					__facade_register__(middleware);
+				}
+			}
+
+			const __facade_modules_dispatch__: Dispatcher = function (type, init) {
+				if (type === "scheduled" && worker.scheduled !== undefined) {
+					const controller = new __Facade_ScheduledController__(
+						Date.now(),
+						init.cron ?? "",
+						() => {}
+					);
+					return worker.scheduled(controller, env, ctx);
+				}
+			};
+
+			return __facade_invoke__(
+				request,
+				env,
+				ctx,
+				__facade_modules_dispatch__,
+				__facade_modules_fetch__
+			);
+		} else {
+			// We didn't have any middleware so we can skip the invocation chain,
+			// and just call the fetch handler directly
+
+			// We "don't care" if this is undefined as we want to have the same behavior
+			// as if the worker completely bypassed middleware.
+			return __facade_modules_fetch__(request, env, ctx);
+		}
+	},
+};
+
+type HandlerFn<D, R> = (data: D, env: unknown, ctx: ExecutionContext) => R;
+function maskHandlerEnv<D, R>(handler: HandlerFn<D, R>): HandlerFn<D, R> {
+	return (data, env, ctx) => handler(data, getMaskedEnv(env), ctx);
+}
+
+export default facade;