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import { fetchAsync } from '@0x/utils';
import * as R from 'ramda';
import { Connection } from 'typeorm';
export interface TradingPair {
fromSymbol: string;
toSymbol: string;
latestSavedTime: number;
}
const COINLIST_API = 'https://min-api.cryptocompare.com/data/all/coinlist?BuiltOn=7605';
interface CryptoCompareCoinListResp {
Data: Map<string, CryptoCompareCoin>;
}
interface CryptoCompareCoin {
Symbol: string;
BuiltOn: string;
SmartContractAddress: string;
}
const TO_CURRENCIES = ['USD', 'EUR', 'ETH', 'USDT'];
const ETHEREUM_IDENTIFIER = '7605';
const HTTP_OK_STATUS = 200;
/**
* Get trading pairs with latest scraped time for OHLCV records
* @param conn a typeorm Connection to postgres
*/
export async function fetchOHLCVTradingPairsAsync(
conn: Connection,
source: string,
earliestBackfillTime: number,
): Promise<TradingPair[]> {
// fetch existing ohlcv records
const latestTradingPairs: Array<{
from_symbol: string;
to_symbol: string;
latest: string;
}> = await conn.query(`SELECT
MAX(end_time) as latest,
from_symbol,
to_symbol
FROM raw.ohlcv_external
GROUP BY from_symbol, to_symbol;`);
const latestTradingPairsIndex: { [fromSym: string]: { [toSym: string]: number } } = {};
latestTradingPairs.forEach(pair => {
const latestIndex: { [toSym: string]: number } = latestTradingPairsIndex[pair.from_symbol] || {};
latestIndex[pair.to_symbol] = parseInt(pair.latest, 10); // tslint:disable-line:custom-no-magic-numbers
latestTradingPairsIndex[pair.from_symbol] = latestIndex;
});
// get token symbols used by Crypto Compare
const allCoinsResp = await fetchAsync(COINLIST_API);
if (allCoinsResp.status !== HTTP_OK_STATUS) {
return [];
}
const allCoins: CryptoCompareCoinListResp = await allCoinsResp.json();
const erc20CoinsIndex: Map<string, string> = new Map();
Object.entries(allCoins.Data).forEach(pair => {
const [symbol, coinData] = pair;
if (coinData.BuiltOn === ETHEREUM_IDENTIFIER && coinData.SmartContractAddress !== 'N/A') {
erc20CoinsIndex.set(coinData.SmartContractAddress.toLowerCase(), symbol);
}
});
// fetch all tokens that are traded on 0x
const rawTokenAddresses: Array<{ tokenaddress: string }> = await conn.query(
`SELECT DISTINCT(maker_token_address) as tokenaddress FROM raw.exchange_fill_events UNION
SELECT DISTINCT(taker_token_address) as tokenaddress FROM raw.exchange_fill_events`,
);
const tokenAddresses = R.pluck('tokenaddress', rawTokenAddresses);
// join token addresses with CC symbols
const allTokenSymbols: string[] = tokenAddresses
.map(tokenAddress => erc20CoinsIndex.get(tokenAddress.toLowerCase()) || '')
.filter(x => x);
// generate list of all tokens with time of latest existing record OR default earliest time
const allTradingPairCombinations: TradingPair[] = R.chain(sym => {
return TO_CURRENCIES.map(fiat => {
return {
fromSymbol: sym,
toSymbol: fiat,
latestSavedTime: R.path<number>([sym, fiat], latestTradingPairsIndex) || earliestBackfillTime,
};
});
}, allTokenSymbols);
return allTradingPairCombinations;
}
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