From d7041a6595c1d67c19e2e94866c788b157fa9fb1 Mon Sep 17 00:00:00 2001
From: christine betts <chrstn@uw.edu>
Date: Fri, 18 Jul 2025 19:33:04 +0000
Subject: [PATCH] [ide-mode] Send ping every 30 seconds to prevent client from
 closing connection (#4329)

---
 packages/vscode-ide-companion/src/ide-server.ts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/packages/vscode-ide-companion/src/ide-server.ts b/packages/vscode-ide-companion/src/ide-server.ts
index 497929a4..d14b0d7a 100644
--- a/packages/vscode-ide-companion/src/ide-server.ts
+++ b/packages/vscode-ide-companion/src/ide-server.ts
@@ -75,7 +75,22 @@ export class IDEServer {
             transports[newSessionId] = transport;
           },
         });
+
+        const keepAlive = setInterval(() => {
+          try {
+            transport.send({ jsonrpc: '2.0', method: 'ping' });
+          } catch (e) {
+            // If sending a ping fails, the connection is likely broken.
+            // Log the error and clear the interval to prevent further attempts.
+            this.logger.append(
+              'Failed to send keep-alive ping, cleaning up interval.' + e,
+            );
+            clearInterval(keepAlive);
+          }
+        }, 60000); // Send ping every 60 seconds
+
         transport.onclose = () => {
+          clearInterval(keepAlive);
           if (transport.sessionId) {
             this.logger.appendLine(`Session closed: ${transport.sessionId}`);
             sessionsWithInitialNotification.delete(transport.sessionId);