feat: On-Chain-Scanner für Watchlist-Transfers (eth_getLogs, RPC-Fallback, Chunking)

src/server/signals/onchain.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, test } from 'bun:test';
+import { buildLogFilter, decodeTransferLogs, TRANSFER_TOPIC } from './onchain';
+
+const WALLET = '0x5be9a4959308a0d0c7bc0870e319314d8d957dbb';
+
+describe('buildLogFilter', () => {
+  test('filtert auf Token-Whitelist + Transfer-Topic + Wallet als Empfänger', () => {
+    const f = buildLogFilter(100, 200);
+    expect(f.fromBlock).toBe('0x64');
+    expect(f.toBlock).toBe('0xc8');
+    expect(f.address).toContain('0x514910771af9ca656af840dff83e8264ecf986ca'); // LINK
+    expect(f.topics[0]).toBe(TRANSFER_TOPIC);
+    expect(f.topics[1]).toBeNull(); // from: beliebig
+    expect(f.topics[2]).toContain('0x000000000000000000000000' + WALLET.slice(2));
+  });
+});
+
+describe('decodeTransferLogs', () => {
+  test('dekodiert Token, Menge (decimals-skaliert), Tx-Hash, Block', () => {
+    const log = {
+      address: '0x514910771af9ca656af840dff83e8264ecf986ca', // LINK, 18 decimals
+      topics: [
+        TRANSFER_TOPIC,
+        '0x000000000000000000000000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+        '0x000000000000000000000000' + WALLET.slice(2),
+      ],
+      data: '0x' + (5n * 10n ** 18n).toString(16).padStart(64, '0'), // 5 LINK
+      transactionHash: '0xabc',
+      blockNumber: '0x64',
+    };
+    const out = decodeTransferLogs([log]);
+    expect(out).toHaveLength(1);
+    expect(out[0]).toEqual({ symbol: 'LINK', instrument: 'LINK_USDT', amount: 5, txHash: '0xabc', blockNumber: 100 });
+  });
+  test('ignoriert Logs unbekannter Token-Contracts', () => {
+    const log = {
+      address: '0x000000000000000000000000000000000000dead',
+      topics: [TRANSFER_TOPIC, '0x0', '0x0'],
+      data: '0x1',
+      transactionHash: '0xdef',
+      blockNumber: '0x65',
+    };
+    expect(decodeTransferLogs([log])).toHaveLength(0);
+  });
+});