wip fix

.gitignore

@@ -178,4 +178,5 @@ app/web
 app/srv
 app/db
 app/static
-.data
+.data
+.pm_port

package.json

@@ -4,7 +4,7 @@
   "type": "module",
   "scripts": {
     "dev": "bun run --silent --watch ./pkgs/index.ts dev",
-    "prod": "bun run --silent ./pkgs/index.ts",
+    "prod": "bun run --silent ./pkgs/prod.ts",
     "pkgs-upgrade": "bun run --silent ./pkgs/upgrade.ts"
   },
   "workspaces": [
@@ -18,6 +18,7 @@
     "typescript": "^5.0.0"
   },
   "dependencies": {
+    "exit-hook": "^4.0.0",
     "firebase-admin": "^11.11.0"
   }
 }

pkgs/prod.ts

@@ -0,0 +1,63 @@
+import { Subprocess } from "bun";
+import exitHook from "exit-hook";
+import { checkPort, randomBetween } from "utils/ensure";
+
+let port = 0;
+
+try {
+  port = parseInt(await Bun.file(".pm_port").text());
+} catch (e) {
+  while (true) {
+    port = randomBetween(5000, 15000);
+    if (await checkPort(port)) {
+      Bun.write(".pm_port", port.toString());
+      break;
+    }
+  }
+}
+
+exitHook((signal) => {
+  if (main.process && !main.process.killed) {
+    main.process.kill();
+  }
+  console.log(`Exiting with signal: ${signal}`);
+});
+
+const main = {
+  process: null as null | Subprocess,
+  restart: {
+    timeout: null as any,
+  },
+};
+
+console.log("Process Manager running at port:", port);
+
+const startMain = () => {
+  let mode = "started";
+  if (main.process && !main.process.killed) return;
+  if (main.process && main.process.killed) mode = "restarted";
+
+  main.process = Bun.spawn({
+    cmd: ["bun", "run", "pkgs/index.ts"],
+    cwd: process.cwd(),
+    stdout: "inherit",
+    stderr: "inherit",
+    onExit(subprocess, exitCode, signalCode, error) {
+      clearTimeout(main.restart.timeout);
+      main.restart.timeout = setTimeout(startMain, 500);
+    },
+  });
+  console.log(`Main process`, mode, "pid:", main.process.pid);
+};
+startMain();
+Bun.serve({
+  port,
+  async fetch(request, server) {
+    if (main.process && !main.process.killed) {
+      main.process.kill();
+      await main.process.exited;
+    }
+
+    return new Response("OK");
+  },
+});

pkgs/utils/ensure.ts

@@ -3,32 +3,10 @@ import { g } from "./global";
 
 export const ensureNotRunning = async () => {
   await new Promise<void>(async (resolve) => {
-    const checkPort = () => {
-      return new Promise<boolean>(async (done) => {
-        try {
-          const s = await connect({
-            hostname: "0.0.0.0",
-            port: g.port,
-            socket: {
-              open(socket) {},
-              data(socket, data) {},
-              close(socket) {},
-              drain(socket) {},
-              error(socket, error) {},
-            },
-          });
-          s.end();
-          done(false);
-        } catch (e) {
-          done(true);
-        }
-      });
-    };
-
-    if (!(await checkPort())) {
+    if (!(await checkPort(g.port))) {
       g.log.warn(`Port ${g.port} is used, waiting...`);
       setInterval(async () => {
-        if (await checkPort()) resolve();
+        if (await checkPort(g.port)) resolve();
       }, 500);
     } else {
       resolve();
@@ -39,3 +17,25 @@ export const ensureNotRunning = async () => {
 export function randomBetween(min: number, max: number) {
   return Math.floor(Math.random() * (max - min + 1) + min);
 }
+
+export const checkPort = (port: number) => {
+  return new Promise<boolean>(async (done) => {
+    try {
+      const s = await connect({
+        hostname: "0.0.0.0",
+        port,
+        socket: {
+          open(socket) {},
+          data(socket, data) {},
+          close(socket) {},
+          drain(socket) {},
+          error(socket, error) {},
+        },
+      });
+      s.end();
+      done(false);
+    } catch (e) {
+      done(true);
+    }
+  });
+};