fix: harden Data tab against sibling transform crashes and entity races

src/components/DataPanel.tsx

@@ -201,7 +201,15 @@ export function DataPanel({
 
     const isConnected = useAppStore((state) => state.isConnected);
     const hasData = topic.status === 'data' && topic.data !== null && topic.data !== undefined;
-    const canPublish = isConnected && !!(topic.type || topic.type_info || topic.data);
+    // `access` is the explicit per-item write capability; when present it
+    // overrides the legacy "any typed topic is publishable" heuristic so a
+    // read-only data item never surfaces a write form.
+    const canWrite = isConnected && topic.access !== 'read' && !!(topic.type || topic.type_info || topic.data);
+    // Use "Write Value" when the gateway told us this is a writable scalar
+    // (access === 'write' / 'readwrite'); fall back to "Publish Message" for
+    // streaming topics where the operation really is a publish.
+    const writeSectionLabel =
+        topic.access === 'write' || topic.access === 'readwrite' ? 'Write Value' : 'Publish Message';
 
     const handleCopyFromLast = () => {
         if (topic.data) {
@@ -270,10 +278,10 @@ export function DataPanel({
                     )}
                 </div>
 
-                {/* Publish Section */}
-                {canPublish && (
+                {/* Write/Publish Section */}
+                {canWrite && (
                     <div className="border-t pt-4 space-y-2">
-                        <span className="text-sm font-medium">Publish Message</span>
+                        <span className="text-sm font-medium">{writeSectionLabel}</span>
                         <TopicPublishForm
                             topic={topic}
                             entityId={entityId}

src/components/EntityDetailPanel.tsx

@@ -425,6 +425,10 @@ export function EntityDetailPanel({ onConnectClick, viewMode = 'entity', onEntit
             faults: 0,
             logs: 0,
         };
+        // Guard against late results from a previous entity overwriting the
+        // current entity's state. The cleanup flips `cancelled` so any setState
+        // calls after the entity changed become no-ops.
+        let cancelled = false;
         const doFetchResourceCounts = async () => {
             // Mark topicsData as "not loaded yet for the current entity" so the
             // Data tab renders a skeleton instead of an empty-state flash while
@@ -463,20 +467,26 @@ export function EntityDetailPanel({ onConnectClick, viewMode = 'entity', onEntit
                     fetchEntityData(entityType, entityId).catch(() => [] as ComponentTopic[]),
                 ]);
 
+                if (cancelled) return;
+
                 // Store the fetched data for the Data tab
                 const fetchedData = Array.isArray(dataRes) ? dataRes : [];
                 setTopicsData(fetchedData);
 
                 // Use the already-fetched data length instead of a separate request
                 setResourceCounts({ ...counts, data: fetchedData.length, logs: 0 });
             } catch {
+                if (cancelled) return;
                 // On unexpected failure fall back to "loaded empty" so the UI
                 // doesn't get stuck showing the skeleton forever.
                 setTopicsData([]);
             }
         };
 
         doFetchResourceCounts();
+        return () => {
+            cancelled = true;
+        };
     }, [selectedEntity, prefetchResourceCounts, fetchEntityData]);
 
     const handleCopyEntity = async () => {

src/lib/store.ts

@@ -2151,13 +2151,28 @@ export const useAppStore = create<AppState>()(
                     getEntityFaults(client, entityType, entityId).catch(() => ({ data: undefined, error: undefined })),
                 ]);
 
+                // Isolate each transform call: a malformed payload from one
+                // resource (e.g. UDS DTC faults with non-canonical schema)
+                // must not crash the others or the caller's Promise.all.
+                const safeCount = <T>(fn: () => T, fallback: T): T => {
+                    try {
+                        return fn();
+                    } catch {
+                        return fallback;
+                    }
+                };
                 return {
                     data: 0,
-                    operations: opsRes.data ? unwrapItems(opsRes.data).length : 0,
+                    operations: opsRes.data ? safeCount(() => unwrapItems(opsRes.data).length, 0) : 0,
                     configurations: configRes.data
-                        ? transformConfigurationsResponse(configRes.data, entityId).parameters.length
+                        ? safeCount(
+                              () => transformConfigurationsResponse(configRes.data, entityId).parameters.length,
+                              0
+                          )
+                        : 0,
+                    faults: faultsRes.data
+                        ? safeCount(() => transformFaultsResponse(faultsRes.data).items.length, 0)
                         : 0,
-                    faults: faultsRes.data ? transformFaultsResponse(faultsRes.data).items.length : 0,
                 };
             },
 

src/lib/transforms.test.ts

@@ -270,6 +270,63 @@ describe('transformFault', () => {
             const result = transformFault(makeFaultInput({ status: 'UNKNOWN_STATUS' }));
             expect(result.status).toBe('active');
         });
+
+        it('reads aggregatedStatus when status is an object', () => {
+            const result = transformFault(makeFaultInput({ status: { aggregatedStatus: 'active', extra: '1' } }));
+            expect(result.status).toBe('active');
+        });
+
+        it('maps object aggregatedStatus "passive" to pending', () => {
+            const result = transformFault(makeFaultInput({ status: { aggregatedStatus: 'passive' } }));
+            expect(result.status).toBe('pending');
+        });
+
+        it('does not throw when status is null', () => {
+            const result = transformFault(makeFaultInput({ status: null }));
+            expect(result.status).toBe('active');
+        });
+
+        it('does not throw when status is missing', () => {
+            const result = transformFault(makeFaultInput({ status: undefined }));
+            expect(result.status).toBe('active');
+        });
+    });
+
+    describe('field aliases', () => {
+        it('accepts code as a fallback for fault_code', () => {
+            const result = transformFault({
+                code: 'ALT_CODE',
+                description: 'x',
+                severity: 1,
+                severity_label: 'warn',
+                status: 'CONFIRMED',
+                first_occurred: 1700000000,
+            } as never);
+            expect(result.code).toBe('ALT_CODE');
+        });
+
+        it('accepts fault_name as a fallback for description', () => {
+            const result = transformFault({
+                fault_code: 'F1',
+                fault_name: 'Alternative description',
+                severity: 1,
+                severity_label: 'warn',
+                status: 'CONFIRMED',
+                first_occurred: 1700000000,
+            } as never);
+            expect(result.message).toBe('Alternative description');
+        });
+
+        it('does not throw when severity is undefined', () => {
+            const result = transformFault({
+                fault_code: 'F1',
+                description: 'x',
+                severity_label: 'warn',
+                status: 'CONFIRMED',
+                first_occurred: 1700000000,
+            } as never);
+            expect(result.severity).toBe('warning');
+        });
     });
 
     it('includes occurrence metadata in parameters', () => {
@@ -558,6 +615,30 @@ describe('transformDataResponse', () => {
             const result = transformDataResponse({ items: [raw] });
             expect(result[0]?.uniqueKey).toBe('x:publish');
         });
+
+        it('passes through access="read"', () => {
+            const raw = { id: 'x', name: 'x', 'x-medkit': { access: 'read' } };
+            const result = transformDataResponse({ items: [raw] });
+            expect(result[0]?.access).toBe('read');
+        });
+
+        it('passes through access="readwrite"', () => {
+            const raw = { id: 'x', name: 'x', 'x-medkit': { access: 'readwrite' } };
+            const result = transformDataResponse({ items: [raw] });
+            expect(result[0]?.access).toBe('readwrite');
+        });
+
+        it('lowercases access for case-insensitive matching', () => {
+            const raw = { id: 'x', name: 'x', 'x-medkit': { access: 'WRITE' } };
+            const result = transformDataResponse({ items: [raw] });
+            expect(result[0]?.access).toBe('write');
+        });
+
+        it('drops unrecognised access values', () => {
+            const raw = { id: 'x', name: 'x', 'x-medkit': { access: 'execute' } };
+            const result = transformDataResponse({ items: [raw] });
+            expect(result[0]?.access).toBeUndefined();
+        });
     });
 });
 

src/lib/transforms.ts

@@ -59,14 +59,21 @@ export function unwrapItems<T>(response: unknown): T[] {
  * Raw fault item shape returned by the gateway faults endpoints.
  */
 export interface RawFaultItem {
-    fault_code: string;
-    description: string;
-    severity: number;
-    severity_label: string;
-    status: string;
+    /** Canonical SOVD identifier. `code` accepted as a fallback for backends
+     *  that have not yet aligned on the SOVD field name. */
+    fault_code?: string;
+    code?: string;
+    /** Human-readable description. `fault_name` accepted as a fallback. */
+    description?: string;
+    fault_name?: string;
+    severity?: number;
+    severity_label?: string;
+    /** Canonical value is a string. An object form with `aggregatedStatus`
+     *  is also accepted to keep the UI from crashing on payload drift. */
+    status?: string | { aggregatedStatus?: string; [key: string]: unknown } | null;
     /** Accepted as unix seconds (number), ISO 8601 string, or missing/invalid;
      *  `transformFault` normalises all of these to an ISO timestamp. */
-    first_occurred: number | string | null | undefined;
+    first_occurred?: number | string | null;
     last_occurred?: number | string | null;
     occurrence_count?: number;
     reporting_sources?: string[];
@@ -91,21 +98,29 @@ export function transformFault(apiFault: RawFaultItem): Fault {
     // Map severity number/label to FaultSeverity.
     // Label check takes priority over numeric value; critical is checked first.
     let severity: FaultSeverity = 'info';
+    const severityNum = typeof apiFault.severity === 'number' ? apiFault.severity : 0;
     const label = apiFault.severity_label?.toLowerCase() || '';
-    if (label === 'critical' || apiFault.severity >= 3) {
+    if (label === 'critical' || severityNum >= 3) {
         severity = 'critical';
-    } else if (label === 'error' || apiFault.severity === 2) {
+    } else if (label === 'error' || severityNum === 2) {
         severity = 'error';
-    } else if (label === 'warn' || label === 'warning' || apiFault.severity === 1) {
+    } else if (label === 'warn' || label === 'warning' || severityNum === 1) {
         severity = 'warning';
     }
 
-    // Map API status string to FaultStatusValue.
+    // Map API status to FaultStatusValue. Accept either a string (canonical SOVD)
+    // or an object with an `aggregatedStatus` field (UDS DTC-style backends).
+    let apiStatus = '';
+    if (typeof apiFault.status === 'string') {
+        apiStatus = apiFault.status.toLowerCase();
+    } else if (apiFault.status && typeof apiFault.status === 'object') {
+        const agg = (apiFault.status as { aggregatedStatus?: unknown }).aggregatedStatus;
+        if (typeof agg === 'string') apiStatus = agg.toLowerCase();
+    }
     let status: FaultStatusValue = 'active';
-    const apiStatus = apiFault.status?.toLowerCase() || '';
     if (apiStatus === 'confirmed' || apiStatus === 'active') {
         status = 'active';
-    } else if (apiStatus === 'pending' || apiStatus === 'prefailed') {
+    } else if (apiStatus === 'pending' || apiStatus === 'prefailed' || apiStatus === 'passive') {
         status = 'pending';
     } else if (apiStatus === 'cleared' || apiStatus === 'resolved') {
         status = 'cleared';
@@ -125,8 +140,8 @@ export function transformFault(apiFault: RawFaultItem): Fault {
     const entity_type = apiFault.entity_type || 'app';
 
     return {
-        code: apiFault.fault_code,
-        message: apiFault.description,
+        code: apiFault.fault_code ?? apiFault.code ?? 'unknown',
+        message: apiFault.description ?? apiFault.fault_name ?? '',
         severity,
         status,
         timestamp: (() => {
@@ -328,6 +343,9 @@ export function transformDataResponse(rawData: unknown): ComponentTopic[] {
         // `direction` above.
         const typeLabel = xm?.ros2?.type ?? xm?.type;
         const hasValue = item.value !== undefined;
+        const rawAccess = xm?.access?.toLowerCase();
+        const access: 'read' | 'write' | 'readwrite' | undefined =
+            rawAccess === 'read' || rawAccess === 'write' || rawAccess === 'readwrite' ? rawAccess : undefined;
         return {
             topic: topicName,
             timestamp: Date.now(),
@@ -344,6 +362,7 @@ export function transformDataResponse(rawData: unknown): ComponentTopic[] {
             isPublisher: direction === 'publish' || direction === 'both' || direction === 'output',
             isSubscriber: direction === 'subscribe' || direction === 'both' || direction === 'input',
             uniqueKey: direction ? `${topicName}:${direction}` : topicName,
+            access,
         };
     });
 }

src/lib/types.ts

@@ -214,6 +214,10 @@ export interface ComponentTopic {
     isSubscriber?: boolean;
     /** Unique key combining topic and direction for React key */
     uniqueKey?: string;
+    /** Access mode from `x-medkit.access`. `'read'` hides the write section,
+     *  `'write'` / `'readwrite'` enable it. Absent means "no constraint" (the
+     *  legacy ROS 2 behaviour where any topic with a known type may publish). */
+    access?: 'read' | 'write' | 'readwrite';
 }
 
 /**