From 91e7485ecc4e780ef454b642a52c3d93faa95af1 Mon Sep 17 00:00:00 2001
From: Alex Browne <stephenalexbrowne@gmail.com>
Date: Wed, 17 Oct 2018 16:44:07 -0700
Subject: Update to use ContractWrappers + Infura instead of Etherscan

---
 .../contract-wrappers/exchange_events.ts           | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 packages/pipeline/src/data_sources/contract-wrappers/exchange_events.ts

(limited to 'packages/pipeline/src/data_sources/contract-wrappers/exchange_events.ts')

diff --git a/packages/pipeline/src/data_sources/contract-wrappers/exchange_events.ts b/packages/pipeline/src/data_sources/contract-wrappers/exchange_events.ts
new file mode 100644
index 000000000..77217c601
--- /dev/null
+++ b/packages/pipeline/src/data_sources/contract-wrappers/exchange_events.ts
@@ -0,0 +1,51 @@
+import { ContractWrappers, ExchangeEvents, ExchangeFillEventArgs, ExchangeWrapper } from '@0xproject/contract-wrappers';
+import { Web3ProviderEngine } from '@0xproject/subproviders';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { LogWithDecodedArgs } from 'ethereum-types';
+
+const BLOCK_FINALITY_THRESHOLD = 10; // When to consider blocks as final. Used to compute default toBlock.
+const NUM_BLOCKS_PER_QUERY = 100000; // Number of blocks to query for events at a time.
+const EXCHANGE_START_BLOCK = 6271590; // Block number when the Exchange contract was deployed to mainnet.
+
+export class ExchangeEventsSource {
+    private _exchangeWrapper: ExchangeWrapper;
+    private _web3Wrapper: Web3Wrapper;
+    constructor(provider: Web3ProviderEngine, networkId: number) {
+        this._web3Wrapper = new Web3Wrapper(provider);
+        const contractWrappers = new ContractWrappers(provider, { networkId });
+        this._exchangeWrapper = contractWrappers.exchange;
+    }
+
+    // TODO(albrow): Get Cancel and CancelUpTo events.
+
+    public async getFillEventsAsync(
+        fromBlock: number = EXCHANGE_START_BLOCK,
+        toBlock?: number,
+    ): Promise<Array<LogWithDecodedArgs<ExchangeFillEventArgs>>> {
+        const calculatedToBlock =
+            toBlock === undefined
+                ? (await this._web3Wrapper.getBlockNumberAsync()) - BLOCK_FINALITY_THRESHOLD
+                : toBlock;
+        let events: Array<LogWithDecodedArgs<ExchangeFillEventArgs>> = [];
+        for (let currFromBlock = fromBlock; currFromBlock <= calculatedToBlock; currFromBlock += NUM_BLOCKS_PER_QUERY) {
+            events = events.concat(
+                await this._getFillEventsForRangeAsync(currFromBlock, currFromBlock + NUM_BLOCKS_PER_QUERY - 1),
+            );
+        }
+        return events;
+    }
+
+    private async _getFillEventsForRangeAsync(
+        fromBlock: number,
+        toBlock: number,
+    ): Promise<Array<LogWithDecodedArgs<ExchangeFillEventArgs>>> {
+        return this._exchangeWrapper.getLogsAsync<ExchangeFillEventArgs>(
+            ExchangeEvents.Fill,
+            {
+                fromBlock,
+                toBlock,
+            },
+            {},
+        );
+    }
+}
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