Implement support for getting and parsing blocks and transactions

packages/pipeline/src/data_sources/web3/index.ts

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+import { Web3ProviderEngine } from '@0x/subproviders';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { BlockWithoutTransactionData, Transaction } from 'ethereum-types';
+
+export class Web3Source {
+    private _web3Wrapper: Web3Wrapper;
+    constructor(provider: Web3ProviderEngine) {
+        this._web3Wrapper = new Web3Wrapper(provider);
+    }
+
+    public async getBlockInfoAsync(blockNumber: number): Promise<BlockWithoutTransactionData> {
+        const block = await this._web3Wrapper.getBlockIfExistsAsync(blockNumber);
+        if (block == null) {
+            return Promise.reject(new Error('Could not find block for given block number: ' + blockNumber));
+        }
+        return block;
+    }
+
+    public async getTransactionInfoAsync(txHash: string): Promise<Transaction> {
+        return this._web3Wrapper.getTransactionByHashAsync(txHash);
+    }
+}

packages/pipeline/src/entities/Block.ts

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+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity()
+export class Block {
+    @PrimaryColumn() public hash!: string;
+    @PrimaryColumn() public number!: number;
+
+    @Column() public unixTimestampSeconds!: number;
+}

packages/pipeline/src/entities/Transaction.ts

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+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity()
+export class Transaction {
+    @PrimaryColumn() public transactionHash!: string;
+    @PrimaryColumn() public blockHash!: string;
+    @PrimaryColumn() public blockNumber!: number;
+
+    @Column() public gasUsed!: number;
+    @Column() public gasPrice!: number;
+}

packages/pipeline/src/index.ts

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+import { web3Factory } from '@0x/dev-utils';
+import { Web3ProviderEngine } from '@0x/subproviders';
+import 'reflect-metadata';
+import { Connection, createConnection } from 'typeorm';
+
+import { ExchangeEventsSource } from './data_sources/contract-wrappers/exchange_events';
+import { Web3Source } from './data_sources/web3';
+import { Block } from './entities/Block';
+import { ExchangeFillEvent } from './entities/ExchangeFillEvent';
+import { Transaction } from './entities/Transaction';
+import { testConfig } from './ormconfig';
+import { parseExchangeEvents } from './parsers/events';
+import { parseBlock, parseTransaction } from './parsers/web3';
+
+const EXCHANGE_START_BLOCK = 6271590; // Block number when the Exchange contract was deployed to mainnet.
+
+let connection: Connection;
+
+(async () => {
+    connection = await createConnection(testConfig);
+    const provider = web3Factory.getRpcProvider({
+        rpcUrl: 'https://mainnet.infura.io',
+    });
+    await getExchangeEventsAsync(provider);
+    await getBlockAsync(provider);
+    await getTransactionAsync(provider);
+    console.log('Exiting process');
+    process.exit(0);
+})();
+
+async function getExchangeEventsAsync(provider: Web3ProviderEngine): Promise<void> {
+    console.log('Getting event logs...');
+    const eventsRepository = connection.getRepository(ExchangeFillEvent);
+    const exchangeEvents = new ExchangeEventsSource(provider, 1);
+    const eventLogs = await exchangeEvents.getFillEventsAsync(EXCHANGE_START_BLOCK, EXCHANGE_START_BLOCK + 100000);
+    console.log('Parsing events...');
+    const events = parseExchangeEvents(eventLogs);
+    console.log(`Retrieved and parsed ${events.length} total events.`);
+    console.log('Saving events...');
+    for (const event of events) {
+        await eventsRepository.save(event);
+    }
+    console.log('Saved events.');
+}
+
+async function getBlockAsync(provider: Web3ProviderEngine): Promise<void> {
+    console.log('Getting block info...');
+    const blocksRepository = connection.getRepository(Block);
+    const web3Source = new Web3Source(provider);
+    const rawBlock = await web3Source.getBlockInfoAsync(EXCHANGE_START_BLOCK);
+    const block = parseBlock(rawBlock);
+    console.log('Saving block info...');
+    await blocksRepository.save(block);
+    console.log('Done saving block.');
+}
+
+async function getTransactionAsync(provider: Web3ProviderEngine): Promise<void> {
+    console.log('Getting tx info...');
+    const txsRepository = connection.getRepository(Transaction);
+    const web3Source = new Web3Source(provider);
+    const rawTx = await web3Source.getTransactionInfoAsync(
+        '0x6dd106d002873746072fc5e496dd0fb2541b68c77bcf9184ae19a42fd33657fe',
+    );
+    const tx = parseTransaction(rawTx);
+    console.log('Saving tx info...');
+    await txsRepository.save(tx);
+    console.log('Done saving tx.');
+}

packages/pipeline/src/parsers/web3/index.ts

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+import { BlockWithoutTransactionData, Transaction as EthTransaction } from 'ethereum-types';
+
+import { Block } from '../../entities/Block';
+import { Transaction } from '../../entities/Transaction';
+
+export function parseBlock(rawBlock: BlockWithoutTransactionData): Block {
+    if (rawBlock.hash == null) {
+        throw new Error('Tried to parse raw block but hash was null');
+    }
+    if (rawBlock.number == null) {
+        throw new Error('Tried to parse raw block but number was null');
+    }
+
+    const block = new Block();
+    block.hash = rawBlock.hash;
+    block.number = rawBlock.number;
+    block.unixTimestampSeconds = rawBlock.timestamp;
+    return block;
+}
+
+export function parseTransaction(rawTransaction: EthTransaction): Transaction {
+    if (rawTransaction.blockHash == null) {
+        throw new Error('Tried to parse raw transaction but blockHash was null');
+    }
+    if (rawTransaction.blockNumber == null) {
+        throw new Error('Tried to parse raw transaction but blockNumber was null');
+    }
+
+    const tx = new Transaction();
+    tx.transactionHash = rawTransaction.hash;
+    tx.blockHash = rawTransaction.blockHash;
+    tx.blockNumber = rawTransaction.blockNumber;
+
+    tx.gasUsed = rawTransaction.gas;
+    // TODO(albrow) figure out bignum solution.
+    tx.gasPrice = rawTransaction.gasPrice.toNumber();
+
+    return tx;
+}