From 4429c98215a3e3956edd41eb445b7fa0aa565a0a Mon Sep 17 00:00:00 2001
From: Val Packett <val@packett.cool>
Date: Wed, 9 Jul 2025 04:00:23 -0300
Subject: [PATCH 1/2] bridge: support systemd socket activation

Instead of opening a new port, inherit a socket from the parent process
when told to, so that systemd could spawn us only when someone actually
connects.
---
 src/bridge.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/bridge.js b/src/bridge.js
index 55a9e77..274a2c6 100644
--- a/src/bridge.js
+++ b/src/bridge.js
@@ -17,6 +17,13 @@ if (process.env.ARRPC_BRIDGE_PORT) {
     throw new Error('invalid port');
   }
 }
+if (process.env.LISTEN_FDS) { // Socket activation
+  const fds = parseInt(process.env.LISTEN_FDS);
+  if (fds !== 1) {
+    throw new Error(`got ${fds} LISTEN_FDS, expecting 1`);
+  }
+  port = { fd: 3 };
+}
 const wss = new WebSocketServer({ port });
 
 wss.on('connection', socket => {

From e9d994995480babf3b91791775577618706bd82e Mon Sep 17 00:00:00 2001
From: Val Packett <val@packett.cool>
Date: Wed, 9 Jul 2025 04:10:09 -0300
Subject: [PATCH 2/2] bridge: automatically deactivate on a timeout with socket
 activation

Allow saving memory by not running when Discord is not open.
---
 src/bridge.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/bridge.js b/src/bridge.js
index 274a2c6..7999d05 100644
--- a/src/bridge.js
+++ b/src/bridge.js
@@ -25,9 +25,15 @@ if (process.env.LISTEN_FDS) { // Socket activation
   port = { fd: 3 };
 }
 const wss = new WebSocketServer({ port });
+let quitTimer;
 
 wss.on('connection', socket => {
   log('web connected');
+  if (quitTimer) {
+    log('client reconnected, not deactivating')
+    clearTimeout(quitTimer);
+    quitTimer = undefined;
+  }
 
   for (const id in lastMsg) { // catch up newly connected
     if (lastMsg[id].activity != null) send(lastMsg[id]);
@@ -35,6 +41,10 @@ wss.on('connection', socket => {
 
   socket.on('close', () => {
     log('web disconnected');
+    if (process.env.LISTEN_FDS && wss.clients.size === 0) {
+      log('last client disconnected, will deactivate in 30s');
+      quitTimer = setTimeout(() => process.exit(0), 30000);
+    }
   });
 });