feat: keep Find Work instant during refresh (#213)

frontend/index.html

@@ -1660,15 +1660,20 @@ textarea { resize: vertical; min-height: 120px; }
   async function openFindWorkSheet() {
     findingWork = true;
     qs('#find-work-sheet').classList.add('open');
-    qs('#find-work-list').textContent = '';
-    qs('#find-work-status').textContent = 'Loading available issues…';
+    const retainedItems = findWorkController.items();
+    if (retainedItems.length) renderAvailableIssues(retainedItems);
+    else qs('#find-work-list').textContent = '';
+    qs('#find-work-status').textContent = retainedItems.length ?
+      'Refreshing available issues…' : 'Loading available issues…';
     qs('#load-more-available').hidden = true;
     qs('#close-find-work').focus();
     try {
-      await findWorkController.load();
-      qs('#find-work-status').textContent = findWorkController.items().length ?
-        findWorkController.items().length + ' of ' + availablePagination.total + ' available issues loaded.' :
-        'No unassigned issues are available.';
+      const result = await findWorkController.load();
+      if (!result?.stale) {
+        qs('#find-work-status').textContent = findWorkController.items().length ?
+          findWorkController.items().length + ' of ' + availablePagination.total + ' available issues loaded.' :
+          'No unassigned issues are available.';
+      }
     } catch (error) {
       qs('#find-work-status').textContent = error.message + ' Close and retry.';
     }

frontend/pick-work.js

@@ -39,6 +39,11 @@ function createFindWork({ fetchJson, onItems, onPagination, onStatus }) {
       headers: { Accept: 'application/json' },
     }).then(result => {
       apply(result, append);
+      if (result?.refresh_failed === true) {
+        onStatus('Showing saved available work. Catalog refresh failed; retrying shortly.');
+      } else if (result?.revalidating === true) {
+        onStatus('Showing saved available work while the catalog refreshes…');
+      }
       return result;
     }).finally(() => { loadRequest = null; });
     return loadRequest;

src/gitea_proxy.py

@@ -11,6 +11,7 @@ GITEA_URL = os.getenv("GITEA_URL", "http://127.0.0.1:3000").rstrip("/")
 GITEA_TOKEN = os.getenv("GITEA_TOKEN", "")
 REVIEW_DIFF_MAX_BYTES = 64 * 1024
 REVIEW_DIFF_MAX_LINES = 400
+AVAILABLE_ISSUE_PAGE_CONCURRENCY = 3
 _client: httpx.AsyncClient | None = None
 
 
@@ -328,8 +329,8 @@ async def available_issue_snapshot(max_pages: int = 10, upstream_limit: int = 50
     """Load, filter, and globally rank a bounded snapshot of available issues."""
     items: list[dict] = []
     seen_ids: set[Any] = set()
-    upstream_total: int | None = None
-    for upstream_page in range(1, max_pages + 1):
+
+    async def load_page(upstream_page: int) -> tuple[list[Any], int | None]:
         response = await _get_client().get(
             "/api/v1/repos/issues/search",
             headers=_auth(),
@@ -342,21 +343,41 @@ async def available_issue_snapshot(max_pages: int = 10, upstream_limit: int = 50
         payload = response.json()
         if not isinstance(payload, list):
             raise ValueError("Gitea available issue search response was not a list")
-        if upstream_total is None:
-            try:
-                upstream_total = max(0, int(response.headers["X-Total-Count"]))
-            except (KeyError, TypeError, ValueError):
-                upstream_total = None
+        try:
+            total = max(0, int(response.headers["X-Total-Count"]))
+        except (KeyError, TypeError, ValueError):
+            total = None
+        return payload, total
+
+    first_payload, upstream_total = await load_page(1)
+    pages: list[list[Any]] = [first_payload]
+    if upstream_total is not None:
+        page_count = min(max_pages, max(1, (upstream_total + upstream_limit - 1) // upstream_limit))
+        semaphore = asyncio.Semaphore(AVAILABLE_ISSUE_PAGE_CONCURRENCY)
+
+        async def load_bounded(page: int) -> list[Any]:
+            async with semaphore:
+                payload, _ = await load_page(page)
+                return payload
+
+        if page_count > 1:
+            pages.extend(await asyncio.gather(*(
+                load_bounded(page) for page in range(2, page_count + 1)
+            )))
+    else:
+        previous = first_payload
+        for page in range(2, max_pages + 1):
+            if not previous or len(previous) < upstream_limit:
+                break
+            previous, _ = await load_page(page)
+            pages.append(previous)
+
+    for payload in pages:
         for raw_item in payload:
             item = _normalize_available_issue(raw_item)
             if item is not None and item["id"] not in seen_ids:
                 seen_ids.add(item["id"])
                 items.append(item)
-        loaded = upstream_page * upstream_limit
-        if not payload or len(payload) < upstream_limit or (
-            upstream_total is not None and loaded >= upstream_total
-        ):
-            break
 
     priority = {"p0", "priority-high", "critical"}
     items.sort(key=lambda item: (item["repository"], item["number"] or 0))

src/main.py

@@ -76,6 +76,7 @@ LIVE_SNAPSHOT_FRESHNESS_SECONDS = 8.0
 LIVE_SNAPSHOT_RETRY_BASE_SECONDS = 5.0
 LIVE_SNAPSHOT_RETRY_MAX_SECONDS = 60.0
 AVAILABLE_ISSUE_SNAPSHOT_FRESHNESS_SECONDS = 15.0
+AVAILABLE_ISSUE_SNAPSHOT_RETRY_SECONDS = 5.0
 FRONTEND_DIR = Path(__file__).resolve().parent.parent / "frontend"
 _live_snapshot_task: asyncio.Task | None = None
 _live_snapshot_value: dict | None = None
@@ -107,6 +108,7 @@ _idempotency_ledger = IdempotencyLedger(
 _available_issue_snapshot_task: asyncio.Task | None = None
 _available_issue_snapshot_value: list[dict] | None = None
 _available_issue_snapshot_created_at: float | None = None
+_available_issue_snapshot_retry_at: float | None = None
 
 
 class ContextPayloadError(ValueError):
@@ -600,13 +602,24 @@ async def paged_work(
 
 async def _refresh_available_issue_snapshot() -> list[dict]:
     global _available_issue_snapshot_value, _available_issue_snapshot_created_at
+    global _available_issue_snapshot_retry_at
     result = await gitea_proxy.available_issue_snapshot()
     _available_issue_snapshot_value = result
     _available_issue_snapshot_created_at = time.monotonic()
+    _available_issue_snapshot_retry_at = None
     return result
 
 
-async def _available_issue_snapshot() -> tuple[list[dict], bool]:
+def _observe_available_issue_refresh(task: asyncio.Task) -> None:
+    global _available_issue_snapshot_retry_at
+    if not task.cancelled():
+        if task.exception() is not None:
+            _available_issue_snapshot_retry_at = (
+                time.monotonic() + AVAILABLE_ISSUE_SNAPSHOT_RETRY_SECONDS
+            )
+
+
+async def _available_issue_snapshot() -> tuple[list[dict], bool, bool, bool]:
     global _available_issue_snapshot_task
     now = time.monotonic()
     if (
@@ -615,16 +628,25 @@ async def _available_issue_snapshot() -> tuple[list[dict], bool]:
         and now - _available_issue_snapshot_created_at
         < AVAILABLE_ISSUE_SNAPSHOT_FRESHNESS_SECONDS
     ):
-        return _available_issue_snapshot_value, False
+        return _available_issue_snapshot_value, False, False, False
+    if (
+        _available_issue_snapshot_value is not None
+        and _available_issue_snapshot_retry_at is not None
+        and now < _available_issue_snapshot_retry_at
+    ):
+        return _available_issue_snapshot_value, True, False, True
     if _available_issue_snapshot_task is None or _available_issue_snapshot_task.done():
         _available_issue_snapshot_task = asyncio.create_task(
             _refresh_available_issue_snapshot()
         )
+        _available_issue_snapshot_task.add_done_callback(_observe_available_issue_refresh)
+    if _available_issue_snapshot_value is not None:
+        return _available_issue_snapshot_value, True, True, False
     try:
-        return await asyncio.shield(_available_issue_snapshot_task), False
+        return await asyncio.shield(_available_issue_snapshot_task), False, False, False
     except Exception:
         if _available_issue_snapshot_value is not None:
-            return _available_issue_snapshot_value, True
+            return _available_issue_snapshot_value, True, False, True
         raise
 
 
@@ -642,7 +664,7 @@ def _available_issue_page(items: list[dict], page: int, limit: int = 50) -> dict
 @app.get("/api/v1/available-issues")
 async def available_issues(page: int = Query(default=1, ge=1, le=100)) -> JSONResponse:
     try:
-        items, stale = await asyncio.wait_for(
+        items, stale, revalidating, refresh_failed = await asyncio.wait_for(
             _available_issue_snapshot(), timeout=WORK_PAGE_TIMEOUT_SECONDS
         )
     except Exception:
@@ -654,6 +676,10 @@ async def available_issues(page: int = Query(default=1, ge=1, le=100)) -> JSONRe
     result = _available_issue_page(items, page)
     if stale:
         result["stale"] = True
+    if revalidating:
+        result["revalidating"] = True
+    if refresh_failed:
+        result["refresh_failed"] = True
     return JSONResponse(result)
 
 

tests/test_gitea_work_search.py

@@ -13,6 +13,7 @@ def reset_available_issue_snapshot():
     main._available_issue_snapshot_task = None
     main._available_issue_snapshot_value = None
     main._available_issue_snapshot_created_at = None
+    main._available_issue_snapshot_retry_at = None
     yield
     task = main._available_issue_snapshot_task
     if task is not None and not task.done():
@@ -20,6 +21,7 @@ def reset_available_issue_snapshot():
     main._available_issue_snapshot_task = None
     main._available_issue_snapshot_value = None
     main._available_issue_snapshot_created_at = None
+    main._available_issue_snapshot_retry_at = None
 
 
 @pytest.mark.anyio
@@ -136,6 +138,53 @@ async def test_available_issue_page_ranks_all_upstream_pages_before_logical_pagi
     }
 
 
+@pytest.mark.anyio
+async def test_available_issue_snapshot_loads_known_remaining_pages_concurrently():
+    active = 0
+    peak_active = 0
+    remaining_started = asyncio.Event()
+    release = asyncio.Event()
+
+    async def upstream(request):
+        nonlocal active, peak_active
+        page = int(request.url.params["page"])
+        if page == 1:
+            return httpx.Response(
+                200, headers={"X-Total-Count": "200"},
+                json=[{
+                    "id": number, "number": number, "title": f"Issue {number}",
+                    "state": "open", "assignees": [], "pull_request": None,
+                    "labels": [], "repository": {"full_name": "stackchain/api"},
+                } for number in range(1, 51)],
+            )
+        active += 1
+        peak_active = max(peak_active, active)
+        if peak_active == 3:
+            remaining_started.set()
+        await release.wait()
+        active -= 1
+        start = (page - 1) * 50 + 1
+        return httpx.Response(200, headers={"X-Total-Count": "200"}, json=[{
+            "id": number, "number": number, "title": f"Issue {number}",
+            "state": "open", "assignees": [], "pull_request": None,
+            "labels": [], "repository": {"full_name": "stackchain/api"},
+        } for number in range(start, start + 50)])
+
+    gitea_proxy.start_client(transport=httpx.MockTransport(upstream))
+    task = asyncio.create_task(gitea_proxy.available_issue_snapshot())
+    try:
+        await asyncio.wait_for(remaining_started.wait(), timeout=1)
+        assert peak_active == 3
+        release.set()
+        result = await asyncio.wait_for(task, timeout=1)
+    finally:
+        release.set()
+        await gitea_proxy.stop_client()
+
+    assert len(result) == 200
+    assert peak_active == 3
+
+
 @pytest.mark.anyio
 async def test_available_issue_endpoint_is_bounded_retryable_and_no_store(monkeypatch):
     calls = []
@@ -204,7 +253,67 @@ async def test_available_issue_endpoint_retains_last_snapshot_on_refresh_failure
     assert response.status_code == 200
     assert response.json() == {
         "items": [{"number": 7}], "page": 1, "total": 1,
-        "has_more": False, "stale": True,
+        "has_more": False, "stale": True, "revalidating": True,
+    }
+
+
+@pytest.mark.anyio
+async def test_available_issue_endpoint_serves_expired_snapshot_while_one_refresh_runs(monkeypatch):
+    calls = 0
+    started = asyncio.Event()
+    release = asyncio.Event()
+
+    async def refresh():
+        nonlocal calls
+        calls += 1
+        started.set()
+        await release.wait()
+        return [{"number": 8}]
+
+    main._available_issue_snapshot_value = [{"number": 7}]
+    main._available_issue_snapshot_created_at = 0.0
+    monkeypatch.setattr(main.gitea_proxy, "available_issue_snapshot", refresh)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        first, second = await asyncio.gather(
+            client.get("/api/v1/available-issues?page=1"),
+            client.get("/api/v1/available-issues?page=1"),
+        )
+        await asyncio.wait_for(started.wait(), timeout=1)
+
+    assert calls == 1
+    assert first.json() == second.json() == {
+        "items": [{"number": 7}], "page": 1, "total": 1,
+        "has_more": False, "stale": True, "revalidating": True,
+    }
+    release.set()
+    await asyncio.wait_for(main._available_issue_snapshot_task, timeout=1)
+    assert main._available_issue_snapshot_value == [{"number": 8}]
+
+
+@pytest.mark.anyio
+async def test_available_issue_endpoint_backs_off_after_background_refresh_failure(monkeypatch):
+    calls = 0
+
+    async def unavailable():
+        nonlocal calls
+        calls += 1
+        raise httpx.ConnectError("offline")
+
+    main._available_issue_snapshot_value = [{"number": 7}]
+    main._available_issue_snapshot_created_at = 0.0
+    monkeypatch.setattr(main.gitea_proxy, "available_issue_snapshot", unavailable)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        first = await client.get("/api/v1/available-issues?page=1")
+        await asyncio.gather(main._available_issue_snapshot_task, return_exceptions=True)
+        second = await client.get("/api/v1/available-issues?page=1")
+
+    assert calls == 1
+    assert first.json()["revalidating"] is True
+    assert second.json() == {
+        "items": [{"number": 7}], "page": 1, "total": 1,
+        "has_more": False, "stale": True, "refresh_failed": True,
     }
 
 

tests/test_my_work.py

@@ -920,6 +920,40 @@ controller.load().then(() => controller.loadMore()).then(() =>
     assert output["pages"][-1] == {"page": 2, "total": 2, "has_more": False}
 
 
+def test_find_work_keeps_retained_cards_and_announces_refresh_freshness():
+    script = f"""
+const createFindWork = require({json.dumps(str(PICK_WORK))});
+const statuses = [];
+const states = [];
+const responses = [
+  {{items:[{{id:1,number:1,repository:'stackchain/api'}}],page:1,total:1,has_more:false,
+    stale:true,revalidating:true}},
+  {{items:[{{id:1,number:1,repository:'stackchain/api'}}],page:1,total:1,has_more:false,
+    stale:true,refresh_failed:true}},
+];
+const controller = createFindWork({{
+  fetchJson: () => Promise.resolve(responses.shift()),
+  onItems: items => states.push(items),
+  onPagination: () => {{}},
+  onStatus: status => statuses.push(status),
+}});
+controller.load().then(() => controller.load()).then(() =>
+  process.stdout.write(JSON.stringify({{statuses,states,items:controller.items()}}))
+);
+"""
+    result = subprocess.run(
+        ["node", "-e", script], check=True, capture_output=True, text=True
+    )
+    output = json.loads(result.stdout)
+
+    assert output["statuses"] == [
+        "Showing saved available work while the catalog refreshes…",
+        "Showing saved available work. Catalog refresh failed; retrying shortly.",
+    ]
+    assert [item["number"] for item in output["items"]] == [1]
+    assert len(output["states"]) == 2
+
+
 def test_find_work_preview_stays_with_issue_across_pagination_and_clears_when_claimed():
     script = f"""
 const createFindWork = require({json.dumps(str(PICK_WORK))});
@@ -1000,6 +1034,9 @@ async def test_mobile_find_work_sheet_is_accessible_touch_sized_and_subpath_safe
     assert '.find-work-action { min-height:44px;' in html
     assert 'padding-bottom:calc(18px + env(safe-area-inset-bottom))' in html
     assert '@media(max-width:320px)' in html
+    assert 'const retainedItems = findWorkController.items();' in html
+    assert 'if (retainedItems.length) renderAvailableIssues(retainedItems);' in html
+    assert 'Refreshing available issues…' in html
 
 
 @pytest.mark.anyio