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import { web3Factory } from '@0x/dev-utils';
import { Web3ProviderEngine } from '@0x/subproviders';
import { logUtils } from '@0x/utils';
import { Web3Wrapper } from '@0x/web3-wrapper';
import R = require('ramda');
import 'reflect-metadata';
import { Connection, ConnectionOptions, createConnection, Repository } from 'typeorm';
import { ExchangeEventsSource } from '../data_sources/contract-wrappers/exchange_events';
import { ExchangeCancelEvent, ExchangeCancelUpToEvent, ExchangeEvent, ExchangeFillEvent } from '../entities';
import * as ormConfig from '../ormconfig';
import { parseExchangeCancelEvents, parseExchangeCancelUpToEvents, parseExchangeFillEvents } from '../parsers/events';
import { EXCHANGE_START_BLOCK, handleError, INFURA_ROOT_URL } from '../utils';
const START_BLOCK_OFFSET = 100; // Number of blocks before the last known block to consider when updating fill events.
const BATCH_SAVE_SIZE = 1000; // Number of events to save at once.
const BLOCK_FINALITY_THRESHOLD = 10; // When to consider blocks as final. Used to compute default endBlock.
let connection: Connection;
(async () => {
connection = await createConnection(ormConfig as ConnectionOptions);
const provider = web3Factory.getRpcProvider({
rpcUrl: INFURA_ROOT_URL,
});
const endBlock = await calculateEndBlockAsync(provider);
const eventsSource = new ExchangeEventsSource(provider, 1);
await getFillEventsAsync(eventsSource, endBlock);
await getCancelEventsAsync(eventsSource, endBlock);
await getCancelUpToEventsAsync(eventsSource, endBlock);
process.exit(0);
})().catch(handleError);
async function getFillEventsAsync(eventsSource: ExchangeEventsSource, endBlock: number): Promise<void> {
logUtils.log('Checking existing fill events...');
const repository = connection.getRepository(ExchangeFillEvent);
const startBlock = await getStartBlockAsync(repository);
logUtils.log(`Getting fill events starting at ${startBlock}...`);
const eventLogs = await eventsSource.getFillEventsAsync(startBlock, endBlock);
logUtils.log('Parsing fill events...');
const events = parseExchangeFillEvents(eventLogs);
logUtils.log(`Retrieved and parsed ${events.length} total fill events.`);
await saveEventsAsync(startBlock === EXCHANGE_START_BLOCK, repository, events);
}
async function getCancelEventsAsync(eventsSource: ExchangeEventsSource, endBlock: number): Promise<void> {
logUtils.log('Checking existing cancel events...');
const repository = connection.getRepository(ExchangeCancelEvent);
const startBlock = await getStartBlockAsync(repository);
logUtils.log(`Getting cancel events starting at ${startBlock}...`);
const eventLogs = await eventsSource.getCancelEventsAsync(startBlock, endBlock);
logUtils.log('Parsing cancel events...');
const events = parseExchangeCancelEvents(eventLogs);
logUtils.log(`Retrieved and parsed ${events.length} total cancel events.`);
await saveEventsAsync(startBlock === EXCHANGE_START_BLOCK, repository, events);
}
async function getCancelUpToEventsAsync(eventsSource: ExchangeEventsSource, endBlock: number): Promise<void> {
logUtils.log('Checking existing CancelUpTo events...');
const repository = connection.getRepository(ExchangeCancelUpToEvent);
const startBlock = await getStartBlockAsync(repository);
logUtils.log(`Getting CancelUpTo events starting at ${startBlock}...`);
const eventLogs = await eventsSource.getCancelUpToEventsAsync(startBlock, endBlock);
logUtils.log('Parsing CancelUpTo events...');
const events = parseExchangeCancelUpToEvents(eventLogs);
logUtils.log(`Retrieved and parsed ${events.length} total CancelUpTo events.`);
await saveEventsAsync(startBlock === EXCHANGE_START_BLOCK, repository, events);
}
const tableNameRegex = /^[a-zA-Z_]*$/;
async function getStartBlockAsync<T extends ExchangeEvent>(repository: Repository<T>): Promise<number> {
const fillEventCount = await repository.count();
if (fillEventCount === 0) {
logUtils.log(`No existing ${repository.metadata.name}s found.`);
return EXCHANGE_START_BLOCK;
}
const tableName = repository.metadata.tableName;
if (!tableNameRegex.test(tableName)) {
throw new Error(`Unexpected special character in table name: ${tableName}`);
}
const queryResult = await connection.query(
`SELECT block_number FROM raw.${tableName} ORDER BY block_number DESC LIMIT 1`,
);
const lastKnownBlock = queryResult[0].block_number;
return lastKnownBlock - START_BLOCK_OFFSET;
}
async function saveEventsAsync<T extends ExchangeEvent>(
isInitialPull: boolean,
repository: Repository<T>,
events: T[],
): Promise<void> {
logUtils.log(`Saving ${repository.metadata.name}s...`);
if (isInitialPull) {
// Split data into numChunks pieces of maximum size BATCH_SAVE_SIZE
// each.
for (const eventsBatch of R.splitEvery(BATCH_SAVE_SIZE, events)) {
await repository.insert(eventsBatch);
}
} else {
// If we possibly have some overlap where we need to update some
// existing events, we need to use our workaround/fallback.
await saveIndividuallyWithFallbackAsync(repository, events);
}
const totalEvents = await repository.count();
logUtils.log(`Done saving events. There are now ${totalEvents} total ${repository.metadata.name}s.`);
}
async function saveIndividuallyWithFallbackAsync<T extends ExchangeEvent>(
repository: Repository<T>,
events: T[],
): Promise<void> {
// Note(albrow): This is a temporary hack because `save` is not working as
// documented and is causing a foreign key constraint violation. Hopefully
// can remove later because this "poor man's upsert" implementation operates
// on one event at a time and is therefore much slower.
for (const event of events) {
try {
// First try an insert.
await repository.insert(event);
} catch {
// If it fails, assume it was a foreign key constraint error and try
// doing an update instead.
// Note(albrow): Unfortunately the `as any` hack here seems
// required. I can't figure out how to convince the type-checker
// that the criteria and the entity itself are the correct type for
// the given repository. If we can remove the `save` hack then this
// will probably no longer be necessary.
await repository.update(
{
contractAddress: event.contractAddress,
blockNumber: event.blockNumber,
logIndex: event.logIndex,
} as any,
event as any,
);
}
}
}
async function calculateEndBlockAsync(provider: Web3ProviderEngine): Promise<number> {
const web3Wrapper = new Web3Wrapper(provider);
const currentBlock = await web3Wrapper.getBlockNumberAsync();
return currentBlock - BLOCK_FINALITY_THRESHOLD;
}
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