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Support systemd socket activation #154

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Support systemd socket activation #154

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4429c98
bridge: support systemd socket activation
valpackett Jul 9, 2025
e9d9949
bridge: automatically deactivate on a timeout with socket activation
valpackett Jul 9, 2025
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17 changes: 17 additions & 0 deletions src/bridge.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,17 +17,34 @@ 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 });
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]);
}

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);
}
});
});

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