improved cloudflare worker adapter + added docs about different modes

app/src/adapter/cloudflare/modes/durable.ts

@@ -0,0 +1,136 @@
+import { DurableObject } from "cloudflare:workers";
+import type { BkndConfig } from "adapter";
+import type { Context } from "adapter/cloudflare";
+import { App, type CreateAppConfig } from "bknd";
+
+export async function getDurable(config: BkndConfig, ctx: Context) {
+   const { dobj } = config.cloudflare?.bindings?.(ctx.env)!;
+   if (!dobj) throw new Error("durable object is not defined in cloudflare.bindings");
+   const key = config.cloudflare?.key ?? "app";
+
+   if (config.onBuilt) {
+      console.log("onBuilt() is not supported with DurableObject mode");
+   }
+
+   const start = performance.now();
+
+   const id = dobj.idFromName(key);
+   const stub = dobj.get(id) as unknown as DurableBkndApp;
+
+   const create_config = typeof config.app === "function" ? config.app(ctx.env) : config.app;
+
+   const res = await stub.fire(ctx.request, {
+      config: create_config,
+      html: ctx.html,
+      keepAliveSeconds: config.cloudflare?.keepAliveSeconds,
+      setAdminHtml: config.setAdminHtml
+   });
+
+   const headers = new Headers(res.headers);
+   headers.set("X-TTDO", String(performance.now() - start));
+
+   return new Response(res.body, {
+      status: res.status,
+      statusText: res.statusText,
+      headers
+   });
+}
+
+export class DurableBkndApp extends DurableObject {
+   protected id = Math.random().toString(36).slice(2);
+   protected app?: App;
+   protected interval?: any;
+
+   async fire(
+      request: Request,
+      options: {
+         config: CreateAppConfig;
+         html?: string;
+         keepAliveSeconds?: number;
+         setAdminHtml?: boolean;
+      }
+   ) {
+      let buildtime = 0;
+      if (!this.app) {
+         const start = performance.now();
+         const config = options.config;
+
+         // change protocol to websocket if libsql
+         if (
+            config?.connection &&
+            "type" in config.connection &&
+            config.connection.type === "libsql"
+         ) {
+            config.connection.config.protocol = "wss";
+         }
+
+         this.app = App.create(config);
+         this.app.emgr.onEvent(
+            App.Events.AppBuiltEvent,
+            async ({ params: { app } }) => {
+               app.modules.server.get("/__do", async (c) => {
+                  // @ts-ignore
+                  const context: any = c.req.raw.cf ? c.req.raw.cf : c.env.cf;
+                  return c.json({
+                     id: this.id,
+                     keepAliveSeconds: options?.keepAliveSeconds ?? 0,
+                     colo: context.colo
+                  });
+               });
+
+               await this.onBuilt(app);
+            },
+            "sync"
+         );
+
+         await this.app.build();
+
+         if (options.setAdminHtml) {
+            this.app.registerAdminController({ html: options.html });
+         }
+
+         buildtime = performance.now() - start;
+      }
+
+      if (options?.keepAliveSeconds) {
+         this.keepAlive(options.keepAliveSeconds);
+      }
+
+      console.log("id", this.id);
+      const res = await this.app!.fetch(request);
+      const headers = new Headers(res.headers);
+      headers.set("X-BuildTime", buildtime.toString());
+      headers.set("X-DO-ID", this.id);
+
+      return new Response(res.body, {
+         status: res.status,
+         statusText: res.statusText,
+         headers
+      });
+   }
+
+   async onBuilt(app: App) {}
+
+   protected keepAlive(seconds: number) {
+      console.log("keep alive for", seconds);
+      if (this.interval) {
+         console.log("clearing, there is a new");
+         clearInterval(this.interval);
+      }
+
+      let i = 0;
+      this.interval = setInterval(() => {
+         i += 1;
+         //console.log("keep-alive", i);
+         if (i === seconds) {
+            console.log("cleared");
+            clearInterval(this.interval);
+
+            // ping every 30 seconds
+         } else if (i % 30 === 0) {
+            console.log("ping");
+            this.app?.modules.ctx().connection.ping();
+         }
+      }, 1000);
+   }
+}