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fix: Prevent duplicate broadcasts in StreamWatcher

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Add deduplication logic to prevent the same line from being broadcast
twice when both direct notification and file watcher fire. Uses a
simple hash and 50ms time window to detect duplicates.

This fixes the double input issue in server-created sessions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Mario Zechner 2025-06-22 20:21:03 +02:00
parent fbc8954d39
commit a84e43dadc
1 changed files with 21 additions and 0 deletions
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21
web/src/server/services/stream-watcher.ts
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@ -13,6 +13,8 @@ interface WatcherInfo {
lastOffset: number;
lineBuffer: string;
notificationListener?: (update: { sessionId: string; data: string; timestamp: number }) => void;
lastBroadcastTime: number;
recentBroadcasts: Set<string>;
}
export class StreamWatcher {
@ -40,6 +42,8 @@ export class StreamWatcher {
clients: new Set(),
lastOffset: 0,
lineBuffer: '',
lastBroadcastTime: 0,
recentBroadcasts: new Set(),
};
this.activeWatchers.set(sessionId, watcherInfo);
@ -269,6 +273,23 @@ export class StreamWatcher {
* Broadcast a line to all clients
*/
private broadcastLine(sessionId: string, line: string, watcherInfo: WatcherInfo): void {
// Deduplication: check if we've broadcast this line very recently
const now = Date.now();
const lineHash = `${line.substring(0, 100)}_${line.length}`; // Simple hash
if (watcherInfo.recentBroadcasts.has(lineHash) && now - watcherInfo.lastBroadcastTime < 50) {
// Skip duplicate within 50ms window
return;
}
// Clean up old broadcasts
if (now - watcherInfo.lastBroadcastTime > 100) {
watcherInfo.recentBroadcasts.clear();
}
watcherInfo.recentBroadcasts.add(lineHash);
watcherInfo.lastBroadcastTime = now;
let eventData: string | null = null;
try {