Add HTTP server to provide status

Author: lorensr

production/README.md

@@ -30,7 +30,7 @@ If you use Docker in production, replace step 3 with:
 
 ```
 docker build . --tag my-temporal-worker --build-arg TEMPORAL_SERVER=host.docker.internal:7233
-docker run my-temporal-worker
+docker run -p 3000:3000 my-temporal-worker
 ```
 
 ### Connecting to deployed Temporal Server

production/package.json

@@ -21,7 +21,8 @@
     ]
   },
   "dependencies": {
-    "temporalio": "0.20.x"
+    "micri": "^4.5.0",
+    "temporalio": "^0.20.1"
   },
   "devDependencies": {
     "@tsconfig/node16": "^1.0.0",

production/src/worker.ts

@@ -1,4 +1,5 @@
 import { NativeConnection, Worker } from '@temporalio/worker';
+import { serve } from 'micri';
 import * as activities from './activities';
 import { connectionOptions, namespace } from './connection';
 
@@ -19,6 +20,20 @@ async function run() {
     taskQueue: 'production-sample',
   });
 
+  const server = serve(async () => {
+    return worker.getStatus();
+  });
+
+  server.listen(process.env.PORT || 3000);
+
+  server.on('error', (err) => {
+    console.error(err);
+  });
+
+  for (const signal of ['SIGINT', 'SIGTERM', 'SIGQUIT', 'SIGUSR2']) {
+    process.on(signal, () => server.close());
+  }
+
   await worker.run();
 }
 // @@@SNIPEND