From 153a86ab59055918d871ef19c6fe5861803391c4 Mon Sep 17 00:00:00 2001
From: Katja Lutz <mail@katjalutz.ch>
Date: Wed, 27 Jul 2022 22:32:43 +0200
Subject: [PATCH] chore: implement server onExit utility

---
 src/server/util.tsx | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/server/util.tsx

diff --git a/src/server/util.tsx b/src/server/util.tsx
new file mode 100644
index 0000000..c9e8bc3
--- /dev/null
+++ b/src/server/util.tsx
@@ -0,0 +1,38 @@
+export const onExit = (cb: () => void) => {
+  /*
+  const origCb = cb;
+  cb = () => {
+    origCb();
+    console.log("finished");
+  };
+  */
+  const cbAndExit = () => {
+    cb();
+    process.exit();
+  };
+
+  const exitSignals = [
+    "SIGINT",
+    "SIGTERM",
+    "uncaughtException",
+    "SIGUSR1",
+    "SIGUSR2",
+  ];
+  const cbSignals = ["beforeExit"];
+
+  for (const signal of exitSignals) {
+    process.on(signal, cbAndExit);
+  }
+  for (const signal of cbSignals) {
+    process.on(signal, cb);
+  }
+
+  return () => {
+    for (const signal of exitSignals) {
+      process.off(signal, cbAndExit);
+    }
+    for (const signal of cbSignals) {
+      process.off(signal, cb);
+    }
+  };
+};