v3.28.7: the batch panel freeze

ramBatchFetch's re-entrancy guard (_ramBatchFetching) is only cleared
when the fetch settles, and ramBatchApplyStatus returned without
rendering whenever it decided a fetch was due - so one stalled
/api/ram-batch/status request (the browser's fetch has no timeout) froze
the whole panel (counts, phase, notice, throbber) at the last successful
render while the server kept installing (live 2026-10-14: 31 installs,
the panel stuck at "Installed: 12"; the log showed all 31 attempts and a
healthy /api/status cadence, so the data was there).

- The summary render now runs on every poll before the fetch decision:
  the headline (phase, current card, counts, notice) always follows the
  2 s /api/status poll; the detailed fetch only adds the attempts table.
- A fetch guard older than RAM_BATCH_FETCH_STALE_MS (10 s) is released,
  so a stalled fetch cannot block the report forever - the next poll
  retries and the attempts table recovers.

Reproduced with the page's real functions: 12 good fetches, the 13th hung
-> the panel stuck at 12 (the reported number); with the fix it follows
the summary to 31 and the stale guard retries.  Tests: a hung fetch keeps
the counts following the summary; a stale guard is released and retried
(a fresh one is kept).  919 frontend + 928 Python; sw cache simple-v445.

frontend/index.html

@@ -1910,7 +1910,7 @@
 // ===== Version =====
 // Single source of truth for the PWA version: shown in the header and used
 // by the server version check in pysimConnect().
-const SIMPLE_VERSION = '3.28.6';
+const SIMPLE_VERSION = '3.28.7';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== view history (the browser Back/Forward buttons) =====
@@ -10155,8 +10155,11 @@ function ramHideProgress() {
 // (the attempts list) is fetched only when the summary says it changed.
 let _ramBatchLast = null;        // the last detailed /api/ram-batch/status
 let _ramBatchFetching = false;
+let _ramBatchFetchAt = 0;        // when the in-flight fetch started (the watchdog)
 let _ramBatchSummary = null;     // /api/status.ram_batch
 let _ramBatchProgress = null;    // /api/status.ram_progress
+// A fetch that never settled must not block the report forever (v3.28.7).
+const RAM_BATCH_FETCH_STALE_MS = 10000;
 
 function ramBatchPanelVisible() {
 	const op = document.getElementById('ram-op');
@@ -10167,6 +10170,7 @@ function ramBatchPanelVisible() {
 async function ramBatchFetch() {
 	if (_ramBatchFetching) return;
 	_ramBatchFetching = true;
+	_ramBatchFetchAt = Date.now();
 	try {
 		_ramBatchLast = await pysimFetch('/api/ram-batch/status');
 	} catch (e) { /* the next poll retries */ }
@@ -10181,14 +10185,22 @@ function ramBatchApplyStatus(status) {
 	_ramBatchSummary = status.ram_batch || null;
 	_ramBatchProgress = status.ram_progress || null;
 	if (!ramBatchPanelVisible()) return;
+	// The summary carries the headline (the phase, the current card, the
+	// counts, the notice): render it on every poll, even when a detailed fetch
+	// is due or stuck - a hung fetch used to freeze the whole panel at the
+	// last successful render (v3.28.7).
+	ramBatchRender();
+	if (_ramBatchFetching && Date.now() - _ramBatchFetchAt > RAM_BATCH_FETCH_STALE_MS) {
+		// the in-flight fetch is stale (a stalled connection): release the
+		// guard so this poll retries and the report can recover
+		_ramBatchFetching = false;
+	}
 	const total = _ramBatchSummary ? (_ramBatchSummary.attempts_total || 0) : 0;
 	const active = _ramBatchSummary ? !!_ramBatchSummary.active : false;
 	if (!_ramBatchLast || (_ramBatchLast.attempts_total || 0) !== total
 			|| !!_ramBatchLast.active !== active) {
 		ramBatchFetch();
-		return;
 	}
-	ramBatchRender();
 }
 
 function ramBatchRender() {

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simple-v444';
+const CACHE = 'simple-v445';
 const URLS = [
   'index.html',
   'help.html',

frontend/tests/ram_batch.test.js

@@ -29,6 +29,9 @@ for (const fn of ['ramBatchPanelVisible', 'ramBatchAttemptsHtml', 'ramBatchRende
 	code += extractFunc(html, fn, ASYNC_FNS.indexOf(fn) >= 0) + '\n';
 }
 
+const RAM_BATCH_FETCH_STALE_MS = parseInt(
+	/const RAM_BATCH_FETCH_STALE_MS = (\d+);/.exec(html)[1], 10);
+
 const els = {};
 function setEl(id, value) {
 	els[id] = {
@@ -54,7 +57,11 @@ const app = new Function('els', `
 	var t = k => k;
 	var isViewVisible = () => sandbox.visibility;
 	var alert = m => sandbox.alerts.push(String(m));
-	var pysimFetch = async (p) => { sandbox.fetched.push(p); return sandbox.replies[p] || null; };
+	var pysimFetch = async (p) => {
+		sandbox.fetched.push(p);
+		if (sandbox.hangs) return new Promise(() => {});   // a stalled connection
+		return sandbox.replies[p] || null;
+	};
 	var pysimFetchOk = async (p, body) => {
 		sandbox.fetched.push(p);
 		sandbox.bodies = sandbox.bodies || {};
@@ -68,12 +75,17 @@ const app = new Function('els', `
 	var pysimApplyAvailability = () => {};
 	var _ramBatchLast = null;
 	var _ramBatchFetching = false;
+	var _ramBatchFetchAt = 0;
 	var _ramBatchSummary = null;
 	var _ramBatchProgress = null;
+	var RAM_BATCH_FETCH_STALE_MS = ${RAM_BATCH_FETCH_STALE_MS};
 	${code}
 	sandbox.getLast = () => _ramBatchLast;
 	sandbox.setLast = v => { _ramBatchLast = v; };
 	sandbox.getSummary = () => _ramBatchSummary;
+	sandbox.isFetching = () => _ramBatchFetching;
+	sandbox.setFetchingStale = ms => { _ramBatchFetching = true; _ramBatchFetchAt = Date.now() - ms; };
+	sandbox.resetFetching = () => { _ramBatchFetching = false; };
 	sandbox.getProgress = () => _ramBatchProgress;
 	sandbox.ramBatchPanelVisible = ramBatchPanelVisible;
 	sandbox.ramBatchAttemptsHtml = ramBatchAttemptsHtml;
@@ -265,6 +277,65 @@ test('the panel headline follows the live summary (phase and step)', () => {
 	assert.strictEqual(els['ram-batch-state'].textContent, 'Insert next card. Waiting for a card...');
 });
 
+test('a hung detailed fetch does not freeze the counts (v3.28.7)', async () => {
+	clearEls();
+	setEl('ram-op', 'batch');
+	setEl('ram-batch-panel', '');
+	setEl('ram-batch-start', '');
+	setEl('ram-batch-stop', '');
+	setEl('ram-batch-clear', '');
+	setEl('ram-batch-spin', '');
+	setEl('ram-batch-state', '');
+	setEl('ram-batch-notice', '');
+	setEl('ram-batch-counts', '');
+	setEl('ram-batch-attempts', '');
+	app.hangs = true;                        // every detailed fetch stalls
+	const sum = n => ({ ram_batch: { active: true, phase: 'waiting_card', attempts_total: n,
+		counts: { installed: n, failed: 0, skipped: 0 } } });
+	app.ramBatchApplyStatus(sum(12));
+	await new Promise(r => setImmediate(r));
+	assert.match(els['ram-batch-counts'].textContent, /Installed: 12/);
+	// the fetch never settles, but the headline must follow the summary
+	app.ramBatchApplyStatus(sum(31));
+	await new Promise(r => setImmediate(r));
+	assert.match(els['ram-batch-counts'].textContent, /Installed: 31/);
+	app.hangs = false;
+});
+
+test('a stale fetch guard is released so the report recovers (v3.28.7)', async () => {
+	clearEls();
+	setEl('ram-op', 'batch');
+	setEl('ram-batch-panel', '');
+	setEl('ram-batch-start', '');
+	setEl('ram-batch-stop', '');
+	setEl('ram-batch-clear', '');
+	setEl('ram-batch-spin', '');
+	setEl('ram-batch-state', '');
+	setEl('ram-batch-notice', '');
+	setEl('ram-batch-counts', '');
+	setEl('ram-batch-attempts', '');
+	app.fetched = [];
+	app.replies['/api/ram-batch/status'] = { active: true, phase: 'waiting_card', attempts: [],
+		attempts_total: 31, counts: { installed: 31, failed: 0, skipped: 0 } };
+	// the guard stuck for 11 s: the poll releases it and retries
+	app.setFetchingStale(11000);
+	app.ramBatchApplyStatus({ ram_batch: { active: true, phase: 'waiting_card', attempts_total: 31,
+		counts: { installed: 31, failed: 0, skipped: 0 } } });
+	// the stale guard is released and this poll retries (the fetch is issued)
+	await new Promise(r => setImmediate(r));
+	assert.deepStrictEqual(app.fetched, ['/api/ram-batch/status']);
+	assert.ok(!app.isFetching(), 'the guard must be clear again after the fetch');
+	assert.match(els['ram-batch-counts'].textContent, /Installed: 31/);
+	// a fresh guard is kept (no duplicate fetch)
+	app.fetched = [];
+	app.setFetchingStale(1000);
+	app.ramBatchApplyStatus({ ram_batch: { active: true, phase: 'waiting_card', attempts_total: 31,
+		counts: { installed: 31, failed: 0, skipped: 0 } } });
+	await new Promise(r => setImmediate(r));
+	assert.deepStrictEqual(app.fetched, []);
+	app.resetFetching();
+});
+
 test('the stop and clear calls hit their endpoints', async () => {
 	clearEls();
 	app.fetched = [];

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.28.6"
+version = "3.28.7"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.

pysim_simple_server/server.py

@@ -37,7 +37,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.28.6'
+VERSION = '3.28.7'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE