Restore an evicted server copy from an online holder

server/p2p-hub.test.js

@@ -85,3 +85,21 @@ test('holders payload: persistent rows, online flag, stale marker, share-off hid
   ]);
   expect(JSON.stringify(p)).not.toContain('dev_'); // never leak device ids
 });
+
+test('rehydrator asks one online sharing holder, once per 10 min, only when the server has no copy', async () => {
+  const { createRehydrator } = await import('./p2p-hub.js');
+  const sent = [];
+  let t = NOW;
+  let serverHas = false;
+  const hub = { isOnline: (d) => d === 'dev_000000000000000a' || d === 'dev_000000000000000c', send: (d, m) => { sent.push([d, m]); return true; } };
+  const rehydrate = createRehydrator({ p2pDb, hub, hasServerCopy: async () => serverHas, now: () => t });
+  expect(await rehydrate('dQw4w9WgXcQ')).toBe(true);
+  // c is online but has sharing off; a is online and shares.
+  expect(sent).toEqual([['dev_000000000000000a', { type: 'upload-request', videoId: 'dQw4w9WgXcQ', cid: CID }]]);
+  expect(await rehydrate('dQw4w9WgXcQ')).toBe(true);   // recently asked — no second message
+  expect(sent.length).toBe(1);
+  t += 11 * 60_000;
+  serverHas = true;
+  expect(await rehydrate('dQw4w9WgXcQ')).toBe(false);  // server copy is back
+  expect(await rehydrate('unknownVid1')).toBe(false);  // nobody holds it
+});