added aws lambda adapter + improvements to handle concurrency

app/src/adapter/aws/aws-lambda.adapter.ts

@@ -0,0 +1,68 @@
+import type { App } from "bknd";
+import { handle } from "hono/aws-lambda";
+import { type RuntimeBkndConfig, createRuntimeApp } from "bknd/adapter";
+
+export type AwsLambdaBkndConfig = RuntimeBkndConfig & {
+   assets?:
+      | {
+           mode: "local";
+           root: string;
+        }
+      | {
+           mode: "url";
+           url: string;
+        };
+};
+
+let app: App;
+export async function createApp({
+   adminOptions = false,
+   assets,
+   ...config
+}: AwsLambdaBkndConfig = {}) {
+   if (!app) {
+      let additional: Partial<RuntimeBkndConfig> = {
+         adminOptions,
+      };
+
+      if (assets?.mode) {
+         switch (assets.mode) {
+            case "local":
+               // @todo: serve static outside app context
+               additional = {
+                  adminOptions: adminOptions === false ? undefined : adminOptions,
+                  serveStatic: (await import("@hono/node-server/serve-static")).serveStatic({
+                     root: assets.root,
+                     onFound: (path, c) => {
+                        c.res.headers.set("Cache-Control", "public, max-age=31536000");
+                     },
+                  }),
+               };
+               break;
+            case "url":
+               additional.adminOptions = {
+                  ...(typeof adminOptions === "object" ? adminOptions : {}),
+                  assets_path: assets.url,
+               };
+               break;
+            default:
+               throw new Error("Invalid assets mode");
+         }
+      }
+
+      app = await createRuntimeApp({
+         ...config,
+         ...additional,
+      });
+   }
+
+   return app;
+}
+
+export function serveLambda(config: AwsLambdaBkndConfig = {}) {
+   console.log("serving lambda");
+   return async (event) => {
+      const app = await createApp(config);
+      return await handle(app.server)(event);
+   };
+}