Refactor event scraping and add support for scraping ERC20 approval events (#1401)

* Refactor event scraping and add support for scraping ERC20 approval events

* Add tests for data_sources/contract-wrappers/utils

1 files changed, 29 insertions, 0 deletions

diff --git a/packages/pipeline/test/entities/erc20_approval_events_test.ts b/packages/pipeline/test/entities/erc20_approval_events_test.ts
new file mode 100644
index 000000000..1ecf41ee5
--- /dev/null
+++ b/packages/pipeline/test/entities/erc20_approval_events_test.ts
@@ -0,0 +1,29 @@
+import { BigNumber } from '@0x/utils';
+import 'mocha';
+import 'reflect-metadata';
+
+import { ERC20ApprovalEvent } from '../../src/entities';
+import { createDbConnectionOnceAsync } from '../db_setup';
+import { chaiSetup } from '../utils/chai_setup';
+
+import { testSaveAndFindEntityAsync } from './util';
+
+chaiSetup.configure();
+
+// tslint:disable:custom-no-magic-numbers
+describe('ERC20ApprovalEvent entity', () => {
+    it('save/find', async () => {
+        const connection = await createDbConnectionOnceAsync();
+        const event = new ERC20ApprovalEvent();
+        event.tokenAddress = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2';
+        event.blockNumber = 6281577;
+        event.rawData = '0x000000000000000000000000000000000000000000000002b9cba5ee21ad3df9';
+        event.logIndex = 43;
+        event.transactionHash = '0xcb46b19c786376a0a0140d51e3e606a4c4f926d8ca5434e96d2f69d04d8d9c7f';
+        event.ownerAddress = '0x0b65c5f6f3a05d6be5588a72b603360773b3fe04';
+        event.spenderAddress = '0x448a5065aebb8e423f0896e6c5d525c040f59af3';
+        event.amount = new BigNumber('50281464906893835769');
+        const blocksRepository = connection.getRepository(ERC20ApprovalEvent);
+        await testSaveAndFindEntityAsync(blocksRepository, event);
+    });
+});