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Fix DMR frontend/backend state desync causing 409 on start

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When the backend has an active DMR session but the frontend lost track
(page refresh, broken flags causing silent running), clicking Start
returned 409 with no recovery path. Now the frontend resyncs on
"Already running" responses and checks backend status on tab activation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-08 23:20:02 +00:00
parent b8a80460bf
commit b96eb8ccba
2 changed files with 50 additions and 0 deletions
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49
static/js/modes/dmr.js
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@@ -91,6 +91,21 @@ function startDmr() {
if (typeof showNotification === 'function') {
showNotification('DMR', `Decoding ${frequency} MHz (${protocol.toUpperCase()})`);
}
} else if (data.status === 'error' && data.message === 'Already running') {
// Backend has an active session the frontend lost track of — resync
isDmrRunning = true;
updateDmrUI();
connectDmrSSE();
if (!dmrSynthInitialized) initDmrSynthesizer();
dmrEventType = 'idle';
dmrActivityTarget = 0.1;
dmrLastEventTime = Date.now();
updateDmrSynthStatus();
const statusEl = document.getElementById('dmrStatus');
if (statusEl) statusEl.textContent = 'DECODING';
if (typeof showNotification === 'function') {
showNotification('DMR', 'Reconnected to active session');
}
} else {
if (typeof showNotification === 'function') {
showNotification('Error', data.message || 'Failed to start DMR');
@@ -496,9 +511,43 @@ function stopDmrSynthesizer() {
window.addEventListener('resize', resizeDmrSynthesizer);
// ============== STATUS SYNC ==============
function checkDmrStatus() {
fetch('/dmr/status')
.then(r => r.json())
.then(data => {
if (data.running && !isDmrRunning) {
// Backend is running but frontend lost track — resync
isDmrRunning = true;
updateDmrUI();
connectDmrSSE();
if (!dmrSynthInitialized) initDmrSynthesizer();
dmrEventType = 'idle';
dmrActivityTarget = 0.1;
dmrLastEventTime = Date.now();
updateDmrSynthStatus();
const statusEl = document.getElementById('dmrStatus');
if (statusEl) statusEl.textContent = 'DECODING';
} else if (!data.running && isDmrRunning) {
// Backend stopped but frontend didn't know
isDmrRunning = false;
if (dmrEventSource) { dmrEventSource.close(); dmrEventSource = null; }
updateDmrUI();
dmrEventType = 'stopped';
dmrActivityTarget = 0;
updateDmrSynthStatus();
const statusEl = document.getElementById('dmrStatus');
if (statusEl) statusEl.textContent = 'STOPPED';
}
})
.catch(() => {});
}
// ============== EXPORTS ==============
window.startDmr = startDmr;
window.stopDmr = stopDmr;
window.checkDmrTools = checkDmrTools;
window.checkDmrStatus = checkDmrStatus;
window.initDmrSynthesizer = initDmrSynthesizer;