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import { fetchAsync } from '@0x/utils';
const IDEX_BASE_URL = 'https://api.idex.market';
const MARKETS_URL = `${IDEX_BASE_URL}/returnTicker`;
const ORDERBOOK_URL = `${IDEX_BASE_URL}/returnOrderBook`;
const MAX_ORDER_COUNT = 100; // Maximum based on https://github.com/AuroraDAO/idex-api-docs#returnorderbook
export const IDEX_SOURCE = 'idex';
export interface IdexMarketsResponse {
[marketName: string]: IdexMarket;
}
export interface IdexMarket {
last: string;
high: string;
low: string;
lowestAsk: string;
highestBid: string;
percentChange: string;
baseVolume: string;
quoteVolume: string;
}
export interface IdexOrderbook {
asks: IdexOrder[];
bids: IdexOrder[];
}
export interface IdexOrder {
price: string;
amount: string;
total: string;
orderHash: string;
params: IdexOrderParam;
}
export interface IdexOrderParam {
tokenBuy: string;
buySymbol: string;
buyPrecision: number;
amountBuy: string;
tokenSell: string;
sellSymbol: string;
sellPrecision: number;
amountSell: string;
expires: number;
nonce: number;
user: string;
}
// tslint:disable:prefer-function-over-method
// ^ Keep consistency with other sources and help logical organization
export class IdexSource {
/**
* Call Idex API to find out which markets they are maintaining orderbooks for.
*/
public async getMarketsAsync(): Promise<string[]> {
const params = { method: 'POST' };
const resp = await fetchAsync(MARKETS_URL, params);
const respJson: IdexMarketsResponse = await resp.json();
const markets: string[] = Object.keys(respJson);
return markets;
}
/**
* Retrieve orderbook from Idex API for a given market.
* @param marketId String identifying the market we want data for. Eg. 'REP_AUG'
*/
public async getMarketOrderbookAsync(marketId: string): Promise<IdexOrderbook> {
const params = {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
market: marketId,
count: MAX_ORDER_COUNT,
}),
};
const resp = await fetchAsync(ORDERBOOK_URL, params);
const respJson: IdexOrderbook = await resp.json();
return respJson;
}
}
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