feat(medusa,medusa-core-utils): graceful shutdown server (#3408)

* feat: graceful shutdown

packages/medusa/src/commands/start.js

@@ -2,6 +2,7 @@ import "core-js/stable"
 import "regenerator-runtime/runtime"
 
 import express from "express"
+import { GracefulShutdownServer } from "medusa-core-utils"
 import { track } from "medusa-telemetry"
 import { scheduleJob } from "node-schedule"
 
@@ -19,13 +20,31 @@ export default async function ({ port, directory }) {
 
     const { dbConnection } = await loaders({ directory, expressApp: app })
     const serverActivity = Logger.activity(`Creating server`)
-    const server = app.listen(port, (err) => {
-      if (err) {
-        return
-      }
-      Logger.success(serverActivity, `Server is ready on port: ${port}`)
-      track("CLI_START_COMPLETED")
-    })
+    const server = GracefulShutdownServer.create(
+      app.listen(port, (err) => {
+        if (err) {
+          return
+        }
+        Logger.success(serverActivity, `Server is ready on port: ${port}`)
+        track("CLI_START_COMPLETED")
+      })
+    )
+
+    // Handle graceful shutdown
+    const gracefulShutDown = () => {
+      server
+        .shutdown()
+        .then(() => {
+          Logger.info("Gracefully stopping the server.")
+          process.exit(0)
+        })
+        .catch((e) => {
+          Logger.error("Error received when shutting down the server.", e)
+          process.exit(1)
+        })
+    }
+    process.on("SIGTERM", gracefulShutDown)
+    process.on("SIGINT", gracefulShutDown)
 
     scheduleJob(CRON_SCHEDULE, () => {
       track("PING")