Add script for pulling missing block data

3 files changed, 89 insertions, 3 deletions

diff --git a/packages/pipeline/src/entities/block.ts b/packages/pipeline/src/entities/block.ts
index 51be37703..f2efc6390 100644
--- a/packages/pipeline/src/entities/block.ts
+++ b/packages/pipeline/src/entities/block.ts
@@ -5,6 +5,6 @@ export class Block {
     @PrimaryColumn() public hash!: string;
     @PrimaryColumn() public number!: number;
 
-    @Column({ name: 'unix_timestamp_seconds' })
-    public unixTimestampSeconds!: number;
+    @Column({ name: 'timestamp' })
+    public timestamp!: number;
 }
diff --git a/packages/pipeline/src/parsers/web3/index.ts b/packages/pipeline/src/parsers/web3/index.ts
index 2ead4c0e4..9b5b3b55d 100644
--- a/packages/pipeline/src/parsers/web3/index.ts
+++ b/packages/pipeline/src/parsers/web3/index.ts
@@ -2,6 +2,8 @@ import { BlockWithoutTransactionData, Transaction as EthTransaction } from 'ethe
 
 import { Block, Transaction } from '../../entities';
 
+const MILLISECONDS_PER_SECOND = 1000;
+
 /**
  * Parses a raw block and returns a Block entity.
  * @param rawBlock a raw block (e.g. returned from web3-wrapper).
@@ -17,7 +19,8 @@ export function parseBlock(rawBlock: BlockWithoutTransactionData): Block {
     const block = new Block();
     block.hash = rawBlock.hash;
     block.number = rawBlock.number;
-    block.unixTimestampSeconds = rawBlock.timestamp;
+    // Block timestamps are in seconds, but we use milliseconds everywhere else.
+    block.timestamp = rawBlock.timestamp * MILLISECONDS_PER_SECOND;
     return block;
 }
 
diff --git a/packages/pipeline/src/scripts/pull_missing_blocks.ts b/packages/pipeline/src/scripts/pull_missing_blocks.ts
new file mode 100644
index 000000000..4a1483ab9
--- /dev/null
+++ b/packages/pipeline/src/scripts/pull_missing_blocks.ts
@@ -0,0 +1,83 @@
+// tslint:disable:no-console
+import { web3Factory } from '@0x/dev-utils';
+import * as Parallel from 'async-parallel';
+import R = require('ramda');
+import 'reflect-metadata';
+import { Connection, ConnectionOptions, createConnection, Repository } from 'typeorm';
+
+import { Web3Source } from '../data_sources/web3';
+import { Block } from '../entities';
+import * as ormConfig from '../ormconfig';
+import { parseBlock } from '../parsers/web3';
+import { handleError } from '../utils';
+
+// Number of blocks to save at once.
+const BATCH_SAVE_SIZE = 1000;
+// Maximum number of requests to send at once.
+const MAX_CONCURRENCY = 10;
+// Maximum number of blocks to query for at once. This is also the maximum
+// number of blocks we will hold in memory prior to being saved to the database.
+const MAX_BLOCKS_PER_QUERY = 1000;
+// Block number when the Exchange contract was deployed to mainnet.
+// TODO(albrow): De-dupe this constant.
+const EXCHANGE_START_BLOCK = 6271590;
+
+let connection: Connection;
+
+(async () => {
+    connection = await createConnection(ormConfig as ConnectionOptions);
+    const provider = web3Factory.getRpcProvider({
+        rpcUrl: `https://mainnet.infura.io/${process.env.INFURA_API_KEY}`,
+    });
+    const web3Source = new Web3Source(provider);
+    await getAllMissingBlocks(web3Source);
+    process.exit(0);
+})().catch(handleError);
+
+interface MissingBlocksResponse {
+    block_number: string;
+}
+
+async function getAllMissingBlocks(web3Source: Web3Source): Promise<void> {
+    const blocksRepository = connection.getRepository(Block);
+    let fromBlock = EXCHANGE_START_BLOCK;
+    while (true) {
+        const blockNumbers = await getMissingBlockNumbers(fromBlock);
+        if (blockNumbers.length === 0) {
+            // There are no more missing blocks. We're done.
+            break;
+        }
+        await getAndSaveBlocks(web3Source, blocksRepository, blockNumbers);
+        fromBlock = Math.max(...blockNumbers) + 1;
+    }
+    const totalBlocks = await blocksRepository.count();
+    console.log(`Done saving blocks. There are now ${totalBlocks} total blocks.`);
+}
+
+async function getMissingBlockNumbers(fromBlock: number): Promise<number[]> {
+    console.log(`Checking for missing blocks starting at ${fromBlock}...`);
+    const response = (await connection.query(
+        'SELECT DISTINCT(block_number) FROM raw.exchange_fill_events WHERE block_number NOT IN (SELECT number FROM raw.blocks) AND block_number >= $1 ORDER BY block_number ASC LIMIT $2',
+        [fromBlock, MAX_BLOCKS_PER_QUERY],
+    )) as MissingBlocksResponse[];
+    const blockNumberStrings = R.pluck('block_number', response);
+    const blockNumbers = R.map(parseInt, blockNumberStrings);
+    console.log(`Found ${blockNumbers.length} missing blocks in the given range.`);
+    return blockNumbers;
+}
+
+async function getAndSaveBlocks(
+    web3Source: Web3Source,
+    blocksRepository: Repository<Block>,
+    blockNumbers: number[],
+): Promise<void> {
+    console.log(`Getting block data for ${blockNumbers.length} blocks...`);
+    Parallel.setConcurrency(MAX_CONCURRENCY);
+    const rawBlocks = await Parallel.map(blockNumbers, async (blockNumber: number) =>
+        web3Source.getBlockInfoAsync(blockNumber),
+    );
+    console.log(`Parsing ${rawBlocks.length} blocks...`);
+    const blocks = R.map(parseBlock, rawBlocks);
+    console.log(`Saving ${blocks.length} blocks...`);
+    await blocksRepository.save(blocks, { chunk: Math.ceil(blocks.length / BATCH_SAVE_SIZE) });
+}