fix: keep aircraft search results when one feed is down

find_aircraft failed whenever either feed failed. It now answers from the
feeds that responded, names the ones that did not, and searches only the
military feed for registrations, the only feed that reports them.

src/tools/queries/aviation.js

@@ -161,13 +161,31 @@ export const findAircraft = defineTool({
       icao24: 'id',
       registration: 'registration',
     }[key];
-    const feeds = [services.aircraft, services.military].filter(Boolean);
-    const snapshots = await Promise.all(
-      feeds.map((feed) => feed.getSnapshot({}, { signal })),
+    // Only the military feed reports registrations.
+    const feeds = [
+      ...(key === 'registration'
+        ? []
+        : [{ name: 'civil', feed: services.aircraft }]),
+      { name: 'military', feed: services.military },
+    ].filter(({ feed }) => feed);
+    if (!feeds.length)
+      throw new ToolError(
+        'unavailable',
+        'The military aircraft feed is not available here',
+      );
+    const settled = await Promise.allSettled(
+      feeds.map(({ feed }) => feed.getSnapshot({}, { signal })),
     );
+    signal?.throwIfAborted();
+    // A search succeeds when any feed answers; missing feeds are named.
+    const unavailable = feeds
+      .filter((_, index) => settled[index].status === 'rejected')
+      .map(({ name }) => name);
+    if (unavailable.length === feeds.length) throw settled[0].reason;
     const seen = new Set();
-    const rows = snapshots
-      .flatMap((snapshot) => snapshot.records)
+    const rows = settled
+      .filter((result) => result.status === 'fulfilled')
+      .flatMap((result) => result.value.records)
       .filter(
         (record) =>
           String(record[field] || '')
@@ -177,10 +195,14 @@ export const findAircraft = defineTool({
       .filter((record) => !seen.has(record.id) && seen.add(record.id))
       .map((record) => aircraftRow(record));
     return {
-      summary: rows.length
-        ? `Found ${countNoun(rows.length, 'aircraft', 'aircraft')} with ${key} ${wanted}.`
-        : `No aircraft with ${key} ${wanted} is currently reported.`,
-      data: capRows(rows, args.limit),
+      summary:
+        (rows.length
+          ? `Found ${countNoun(rows.length, 'aircraft', 'aircraft')} with ${key} ${wanted}.`
+          : `No aircraft with ${key} ${wanted} is currently reported.`) +
+        (unavailable.length
+          ? ` The ${unavailable.join(' and ')} feed did not answer.`
+          : ''),
+      data: { ...capRows(rows, args.limit), unavailable_feeds: unavailable },
     };
   },
 });