Prefetch a smaller feed and bound its local cache

1 files changed, 25 insertions, 0 deletions

diff --git a/tools/feed-cache-test.js b/tools/feed-cache-test.js
new file mode 100644
index 0000000..995e01a
--- /dev/null
+++ b/tools/feed-cache-test.js
@@ -0,0 +1,25 @@
+import assert from 'node:assert/strict';
+import { createFeedCache } from '../src/feed-cache.js';
+const values = new Map();
+const storage = { get length() { return values.size; }, key: (i) => [...values.keys()][i],
+  getItem: (k) => values.get(k) || null, setItem: (k, v) => values.set(k, v), removeItem: (k) => values.delete(k) };
+let time = 1000;
+const cache = createFeedCache(storage, 'wallet:feedNotes', () => time++);
+const notes = Array.from({ length: 50 }, (_, i) => ({ id: String(i), pubkey: 'author', kind: 1,
+  created_at: 100 - i, content: 'post', tags: [] }));
+storage.setItem('wallet:feedNotes', JSON.stringify(notes));
+storage.setItem('wallet:funds', 'untouched');
+assert.equal(cache.read('following').length, 30);
+assert.equal(JSON.parse(storage.getItem('wallet:feedNotes')).notes.length, 30);
+for (let i = 0; i < 5; i++) cache.save('custom' + i, notes);
+assert.equal(cache.read('following').length, 0);
+assert.equal([...values.keys()].filter((k) => k.includes('feedNotes')).length, 4);
+cache.read('custom1');
+cache.save('custom5', notes);
+assert.equal(cache.read('custom2').length, 0);
+cache.save('big', notes.map((e) => ({ ...e, content: 'x'.repeat(15000) })));
+assert([...values].filter(([k]) => k.includes('feedNotes')).reduce((n, [, v]) => n + v.length, 0) <= 256000);
+time += 8 * 86400_000;
+assert.equal(cache.read('big').length, 0);
+assert.equal(storage.getItem('wallet:funds'), 'untouched');
+console.log('✓ legacy caches shrink; 30 posts/feed, four feeds, byte budget, LRU and seven-day expiry enforced');