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fix(web-ui): harden SSE broadcaster — drop-oldest on full queue, exit on no subscribers, reattach reconnect handlers

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- _broadcast: on queue.Full drop the oldest item and retry the put
  instead of removing the client from _clients — a slow tab now stays
  subscribed and receives the latest data rather than being silently
  ejected
- _broadcast: break instead of continue when _clients is empty so the
  background generator thread exits rather than spinning indefinitely;
  subscribe() already restarts it on the next connection
- base.html: expose _statsOpenHandler, _statsErrorHandler, and
  _displayErrorHandler as window properties so reconnectSSE() can
  reattach them after replacing the EventSource instances
- app.js: reconnectSSE() now reattaches those handlers after creating
  each new EventSource so the status badge and display-stream console
  logging survive a manual reconnect

Heartbeat path (~line 646) is a queue read (q.get), not a write; no
queue.Full can occur there so no change needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-05-24 17:47:16 -04:00
parent 704e99f55c
commit 9914e26ca0
3 changed files with 31 additions and 13 deletions
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6
web_interface/static/v3/app.js
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@@ -51,7 +51,8 @@ document.body.addEventListener('htmx:afterRequest', function(event) {
}
});
// SSE reconnection helper — closes and reopens both SSE streams.
// SSE reconnection helper — closes and reopens both SSE streams,
// reattaching the open/error handlers defined in base.html.
window.reconnectSSE = function() {
if (window.statsSource) {
window.statsSource.close();
@@ -60,6 +61,8 @@ window.reconnectSSE = function() {
const data = JSON.parse(event.data);
if (typeof updateSystemStats === 'function') updateSystemStats(data);
};
if (window._statsOpenHandler) window.statsSource.addEventListener('open', window._statsOpenHandler);
if (window._statsErrorHandler) window.statsSource.addEventListener('error', window._statsErrorHandler);
}
if (window.displaySource) {
@@ -69,6 +72,7 @@ window.reconnectSSE = function() {
const data = JSON.parse(event.data);
if (typeof updateDisplayPreview === 'function') updateDisplayPreview(data);
};
if (window._displayErrorHandler) window.displaySource.addEventListener('error', window._displayErrorHandler);
}
};