Catch unhandled rejections in background worker

Previously, an unhandled promise rejection in the background worker would crash the process. This way we log it and don't crash.

app/sentry.server.config.ts

@@ -3,6 +3,7 @@
 // https://docs.sentry.io/platforms/javascript/guides/nextjs/
 
 import * as Sentry from "@sentry/nextjs";
+import { isError } from "lodash-es";
 import { env } from "~/env.mjs";
 
 if (env.NEXT_PUBLIC_SENTRY_DSN) {
@@ -15,4 +16,10 @@ if (env.NEXT_PUBLIC_SENTRY_DSN) {
     // Setting this option to true will print useful information to the console while you're setting up Sentry.
     debug: false,
   });
+} else {
+  // Install local debug exception handler for rejected promises
+  process.on("unhandledRejection", (reason) => {
+    const reasonDetails = isError(reason) ? reason?.stack : reason;
+    console.log("Unhandled Rejection at:", reasonDetails);
+  });
 }

app/src/server/tasks/test-tasks.ts

@@ -0,0 +1,47 @@
+import "dotenv/config";
+
+import defineTask from "./defineTask";
+import { type TaskList, run } from "graphile-worker";
+import { env } from "~/env.mjs";
+
+import "../../../sentry.server.config";
+
+export type TestTask = { i: number };
+
+// When a new eval is created, we want to run it on all existing outputs, but return the new eval first
+export const testTask = defineTask<TestTask>("testTask", (task) => {
+  console.log("ran task ", task.i);
+
+  void new Promise((_resolve, reject) => setTimeout(reject, 500));
+  return Promise.resolve();
+});
+
+const registeredTasks = [testTask];
+
+const taskList = registeredTasks.reduce((acc, task) => {
+  acc[task.task.identifier] = task.task.handler;
+  return acc;
+}, {} as TaskList);
+
+// process.on("unhandledRejection", (reason, promise) => {
+//   console.log("Unhandled Rejection at:", reason?.stack || reason);
+// });
+
+// Run a worker to execute jobs:
+const runner = await run({
+  connectionString: env.DATABASE_URL,
+  concurrency: 10,
+  // Install signal handlers for graceful shutdown on SIGINT, SIGTERM, etc
+  noHandleSignals: false,
+  pollInterval: 1000,
+  taskList,
+});
+
+console.log("Worker successfully started");
+
+for (let i = 0; i < 10; i++) {
+  await testTask.enqueue({ i });
+  await new Promise((resolve) => setTimeout(resolve, 1000));
+}
+
+await runner.promise;

app/src/server/tasks/worker.ts

@@ -1,5 +1,6 @@
 import { type TaskList, run } from "graphile-worker";
 import "dotenv/config";
+import "../../../sentry.server.config";
 
 import { env } from "~/env.mjs";
 import { queryModel } from "./queryModel.task";