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exmo.js
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"use strict";
// ---------------------------------------------------------------------------
const Exchange = require ('./base/Exchange')
const { ExchangeError } = require ('./base/errors')
// ---------------------------------------------------------------------------
module.exports = class exmo extends Exchange {
describe () {
return this.deepExtend (super.describe (), {
'id': 'exmo',
'name': 'EXMO',
'countries': [ 'ES', 'RU' ], // Spain, Russia
'rateLimit': 1000, // once every 350 ms ≈ 180 requests per minute ≈ 3 requests per second
'version': 'v1',
'hasCORS': false,
'hasFetchTickers': true,
'hasWithdraw': true,
'urls': {
'logo': 'https://user-images.githubusercontent.com/1294454/27766491-1b0ea956-5eda-11e7-9225-40d67b481b8d.jpg',
'api': 'https://api.exmo.com',
'www': 'https://exmo.me',
'doc': [
'https://exmo.me/en/api_doc',
'https://github.com/exmo-dev/exmo_api_lib/tree/master/nodejs',
],
},
'api': {
'public': {
'get': [
'currency',
'order_book',
'pair_settings',
'ticker',
'trades',
],
},
'private': {
'post': [
'user_info',
'order_create',
'order_cancel',
'user_open_orders',
'user_trades',
'user_cancelled_orders',
'order_trades',
'required_amount',
'deposit_address',
'withdraw_crypt',
'withdraw_get_txid',
'excode_create',
'excode_load',
'wallet_history',
],
},
},
'fees': {
'trading': {
'maker': 0.2 / 100,
'taker': 0.2 / 100,
},
},
});
}
async fetchMarkets () {
let markets = await this.publicGetPairSettings ();
let keys = Object.keys (markets);
let result = [];
for (let p = 0; p < keys.length; p++) {
let id = keys[p];
let market = markets[id];
let symbol = id.replace ('_', '/');
let [ base, quote ] = symbol.split ('/');
result.push ({
'id': id,
'symbol': symbol,
'base': base,
'quote': quote,
'limits': {
'amount': {
'min': market['min_quantity'],
'max': market['max_quantity'],
},
'price': {
'min': market['min_price'],
'max': market['max_price'],
},
'cost': {
'min': market['min_amount'],
'max': market['max_amount'],
},
},
'precision': {
'amount': 8,
'price': 8,
},
'info': market,
});
}
return result;
}
async fetchBalance (params = {}) {
await this.loadMarkets ();
let response = await this.privatePostUserInfo ();
let result = { 'info': response };
for (let c = 0; c < this.currencies.length; c++) {
let currency = this.currencies[c];
let account = this.account ();
if (currency in response['balances'])
account['free'] = parseFloat (response['balances'][currency]);
if (currency in response['reserved'])
account['used'] = parseFloat (response['reserved'][currency]);
account['total'] = this.sum (account['free'], account['used']);
result[currency] = account;
}
return this.parseBalance (result);
}
async fetchOrderBook (symbol, params = {}) {
await this.loadMarkets ();
let market = this.market (symbol);
let response = await this.publicGetOrderBook (this.extend ({
'pair': market['id'],
}, params));
let orderbook = response[market['id']];
return this.parseOrderBook (orderbook, undefined, 'bid', 'ask');
}
parseTicker (ticker, market = undefined) {
let timestamp = ticker['updated'] * 1000;
let symbol = undefined;
if (market)
symbol = market['symbol'];
return {
'symbol': symbol,
'timestamp': timestamp,
'datetime': this.iso8601 (timestamp),
'high': parseFloat (ticker['high']),
'low': parseFloat (ticker['low']),
'bid': parseFloat (ticker['buy_price']),
'ask': parseFloat (ticker['sell_price']),
'vwap': undefined,
'open': undefined,
'close': undefined,
'first': undefined,
'last': parseFloat (ticker['last_trade']),
'change': undefined,
'percentage': undefined,
'average': parseFloat (ticker['avg']),
'baseVolume': parseFloat (ticker['vol']),
'quoteVolume': parseFloat (ticker['vol_curr']),
'info': ticker,
};
}
async fetchTickers (symbols = undefined, params = {}) {
await this.loadMarkets ();
let response = await this.publicGetTicker (params);
let result = {};
let ids = Object.keys (response);
for (let i = 0; i < ids.length; i++) {
let id = ids[i];
let market = this.markets_by_id[id];
let symbol = market['symbol'];
let ticker = response[id];
result[symbol] = this.parseTicker (ticker, market);
}
return result;
}
async fetchTicker (symbol, params = {}) {
await this.loadMarkets ();
let response = await this.publicGetTicker (params);
let market = this.market (symbol);
return this.parseTicker (response[market['id']], market);
}
parseTrade (trade, market) {
let timestamp = trade['date'] * 1000;
return {
'id': trade['trade_id'].toString (),
'info': trade,
'timestamp': timestamp,
'datetime': this.iso8601 (timestamp),
'symbol': market['symbol'],
'order': undefined,
'type': undefined,
'side': trade['type'],
'price': parseFloat (trade['price']),
'amount': parseFloat (trade['quantity']),
};
}
async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
await this.loadMarkets ();
let market = this.market (symbol);
let response = await this.publicGetTrades (this.extend ({
'pair': market['id'],
}, params));
return this.parseTrades (response[market['id']], market);
}
async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
await this.loadMarkets ();
let prefix = '';
if (type == 'market')
prefix = 'market_';
if (typeof price == 'undefined')
price = 0;
let order = {
'pair': this.marketId (symbol),
'quantity': amount,
'price': price,
'type': prefix + side,
};
let response = await this.privatePostOrderCreate (this.extend (order, params));
return {
'info': response,
'id': response['order_id'].toString (),
};
}
async cancelOrder (id, symbol = undefined, params = {}) {
await this.loadMarkets ();
return await this.privatePostOrderCancel ({ 'order_id': id });
}
async withdraw (currency, amount, address, params = {}) {
await this.loadMarkets ();
let result = await this.privatePostWithdrawCrypt (this.extend ({
'amount': amount,
'currency': currency,
'address': address,
}, params));
return {
'info': result,
'id': result['task_id'],
};
}
sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
let url = this.urls['api'] + '/' + this.version + '/' + path;
if (api == 'public') {
if (Object.keys (params).length)
url += '?' + this.urlencode (params);
} else {
let nonce = this.nonce ();
body = this.urlencode (this.extend ({ 'nonce': nonce }, params));
headers = {
'Content-Type': 'application/x-www-form-urlencoded',
'Key': this.apiKey,
'Sign': this.hmac (this.encode (body), this.encode (this.secret), 'sha512'),
};
}
return { 'url': url, 'method': method, 'body': body, 'headers': headers };
}
async request (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
let response = await this.fetch2 (path, api, method, params, headers, body);
if ('result' in response) {
if (response['result'])
return response;
throw new ExchangeError (this.id + ' ' + this.json (response));
}
return response;
}
}