fix(web): improve error handling and API health check logic

- Refactored the API health check to handle errors more gracefully, providing clearer feedback on loading issues.
- Updated the NGINX configuration to use a dynamic upstream variable for better resilience against IP changes in Docker.
- Enhanced user notifications for API availability and data loading errors, including instructions for local demo setup.

deploy/docker/evobgp-web/nginx.conf

@@ -5,8 +5,13 @@ server {
     gzip on;
     gzip_types text/css application/javascript application/json image/svg+xml;
 
+    # Docker embedded DNS: без resolver nginx кэширует IP upstream при старте —
+    # после recreate evobgp-all остаётся 502 (connection refused на старый IP).
+    resolver 127.0.0.11 valid=10s ipv6=off;
+    set $evobgp_upstream evobgp-api;
+
     location /v1/ {
-        proxy_pass http://evobgp-api:8080/v1/;
+        proxy_pass http://$evobgp_upstream:8080/v1/;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
@@ -15,7 +20,7 @@ server {
     }
 
     location = /metrics {
-        proxy_pass http://evobgp-api:8080/metrics;
+        proxy_pass http://$evobgp_upstream:8080/metrics;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
     }

web/src/routes/+page.svelte

@@ -159,12 +159,29 @@
 		}
 	]);
 
+	function toErrorMessage(e: unknown): string {
+		return e instanceof Error ? e.message : String(e);
+	}
+
 	async function load() {
 		if (!initialLoading) refreshing = true;
 		loadError = null;
 		try {
-			const [h, m, p, s, r, j] = await Promise.all([
-				apiFetch('/v1/health'),
+			try {
+				const h = await apiFetch('/v1/health');
+				healthy = h.ok;
+				if (!h.ok) {
+					loadError = `GET /v1/health: HTTP ${h.status}`;
+					return;
+				}
+			} catch (e) {
+				healthy = false;
+				loadError = toErrorMessage(e);
+				notifyApiError(e);
+				return;
+			}
+
+			const [m, p, s, r, j] = await Promise.allSettled([
 				apiJSON<ModulesResponse>('/v1/modules?limit=200'),
 				apiJSON<PeersResponse>('/v1/peers?limit=200'),
 				apiJSON<SpeakersResponse>('/v1/speakers?limit=200'),
@@ -172,24 +189,38 @@
 				apiJSON<JobsResponse>('/v1/jobs?limit=20')
 			]);
 
-			healthy = h.ok;
-			moduleItems = m.items ?? [];
-			modulesHasMore = m.has_more;
-			peerItems = p.items ?? [];
-			peersHasMore = p.has_more;
-			speakerItems = s.items ?? [];
-			speakersHasMore = s.has_more;
-			revisionItems = r.items ?? [];
-			revisionsHasMore = r.has_more;
-			jobItems = j.items ?? [];
-			recentJobs = jobItems.slice(0, 10);
-			recentRevisions = revisionItems.slice(0, 10);
-			runningJobs = jobItems.filter((i) => i.status === 'running' || i.status === 'queued').length;
-			lastUpdated = new Date();
-		} catch (e) {
-			healthy = false;
-			loadError = e instanceof Error ? e.message : String(e);
-			notifyApiError(e);
+			const firstReject = [m, p, s, r, j].find((x) => x.status === 'rejected');
+			if (firstReject?.status === 'rejected') {
+				loadError = toErrorMessage(firstReject.reason);
+				notifyApiError(firstReject.reason);
+			}
+
+			if (m.status === 'fulfilled') {
+				moduleItems = m.value.items ?? [];
+				modulesHasMore = m.value.has_more;
+			}
+			if (p.status === 'fulfilled') {
+				peerItems = p.value.items ?? [];
+				peersHasMore = p.value.has_more;
+			}
+			if (s.status === 'fulfilled') {
+				speakerItems = s.value.items ?? [];
+				speakersHasMore = s.value.has_more;
+			}
+			if (r.status === 'fulfilled') {
+				revisionItems = r.value.items ?? [];
+				revisionsHasMore = r.value.has_more;
+			}
+			if (j.status === 'fulfilled') {
+				jobItems = j.value.items ?? [];
+				recentJobs = jobItems.slice(0, 10);
+				recentRevisions = revisionItems.slice(0, 10);
+				runningJobs = jobItems.filter(
+					(i) => i.status === 'running' || i.status === 'queued'
+				).length;
+			}
+
+			if (!loadError) lastUpdated = new Date();
 		} finally {
 			initialLoading = false;
 			refreshing = false;
@@ -235,18 +266,30 @@
 			<AlertTitle>Проверка API…</AlertTitle>
 			<AlertDescription>Запрос к <code class="text-xs">/v1/health</code></AlertDescription>
 		</Alert>
-	{:else if healthy}
+	{:else if healthy && !loadError}
 		<Alert class="border-success/30 bg-success/5">
 			<CheckCircle class="text-success" />
 			<AlertTitle>API работает</AlertTitle>
 			<AlertDescription>Сервер отвечает на запросы health-check.</AlertDescription>
 		</Alert>
+	{:else if healthy && loadError}
+		<Alert class="border-warning/30 bg-warning/5">
+			<Info class="text-warning" />
+			<AlertTitle>API доступен, данные не загружены</AlertTitle>
+			<AlertDescription>
+				{loadError}. Для локального демо укажите Bearer-токен
+				<code class="text-xs">dev</code> в
+				<Button variant="link" class="h-auto p-0" href={resolve('/settings')}>Настройках</Button>
+				(нужен <code class="text-xs">EVOBGP_DEV_INSECURE=1</code> на API).
+			</AlertDescription>
+		</Alert>
 	{:else}
 		<Alert variant="destructive" class="border-destructive/30 bg-destructive/5">
 			<XCircle class="text-destructive" />
 			<AlertTitle>API недоступен</AlertTitle>
 			<AlertDescription>
-				Не удалось получить ответ от сервера. Проверьте подключение и статус API.
+				{loadError ??
+					'Не удалось получить ответ от сервера. Проверьте, что API запущен (порт 8080), в dev — `npm run dev` с прокси Vite, в Docker — контейнер evobgp-api / evobgp-all и nginx в evobgp-web.'}
 			</AlertDescription>
 		</Alert>
 	{/if}