Upercase Exchange Folder
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exports.newExchangeAPI = function newExchangeAPI(bot, logger) {
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/*
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This module allows trading bots to connect to the exchange and do trading operations on it. So far it can only work with Poloniex.
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*/
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const _ = require('lodash')
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const isValidOrder = require('./exchangeUtils').isValidOrder
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const graphqlClient = require('graphql-client')
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const appRoot = require('app-root-path')
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const auth = require(`${appRoot}/utils/auth`)
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let MODULE_NAME = "Exchange API";
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let thisObject = {
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initialize: initialize,
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getTicker: getTicker,
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getOpenPositions: getOpenPositions,
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getExecutedTrades: getExecutedTrades,
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putPosition: putPosition,
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movePosition: movePosition,
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getPublicTradeHistory: getPublicTradeHistory,
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getExchangeProperties: getExchangeProperties,
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getMaxDecimalPositions: getMaxDecimalPositions
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};
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let apiClient;
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return thisObject;
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async function initialize(callBackFunction) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] initialize -> Entering function."); }
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// TODO integrate with financial beings module to get the exchange
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let botExchange = 'Poloniex';
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let exchange = botExchange.toLowerCase() + 'Client.js';
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let api = require('./wrappers/' + exchange);
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const accessToken = await auth.authenticate()
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let keyVaultAPI = createKeyVaultAPIClient(accessToken)
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apiClient = api.newAPIClient(keyVaultAPI, logger);
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callBackFunction(global.DEFAULT_OK_RESPONSE);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] initialize -> err = " + err.stack);
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callBackFunction(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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function createKeyVaultAPIClient(authToken) {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] createKeyVaultAPIClient -> Entering function."); }
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const keyVaultAPI = graphqlClient({
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url: global.GATEWAY_ENDPOINT,
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headers: {
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Authorization: 'Bearer ' + authToken
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}
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});
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keyVaultAPI.signTransaction = function (transaction, next) {
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let variables = {
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botId: bot.codeName,
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transaction: transaction
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}
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keyVaultAPI.query(`
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mutation($botId: String, $transaction: String!){
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keyVault_SignTransaction(botId: $botId, transaction: $transaction){
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key,
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signature,
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date
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}
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}`, variables, function (req, res) {
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if (res.status === 401) {
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next(undefined, 'Error from graphql: Not authorized');
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}
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}).then(res => {
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if (res.errors) {
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next(undefined, 'Error from graphql: ' + res.errors);
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} else {
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let signature = {
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Key: res.data.keyVault_SignTransaction.key,
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Sign: res.data.keyVault_SignTransaction.signature
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}
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next(signature)
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}
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}).catch(error => {
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next(undefined, 'Error signing the message on the key vault: ' + error.message);
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});
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}
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] createKeyVaultAPIClient -> Returning graphql client."); }
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return keyVaultAPI;
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}
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/*
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* Position Object = {
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* id, String
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* type, String
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* rate, Number
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* amountA, Number
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* amountB, Number
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* fee, Number
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* datetime Date
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* };
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*/
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function truncDecimals(pFloatValue) {
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let decimals = getMaxDecimalPositions();
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return parseFloat(parseFloat(pFloatValue).toFixed(decimals));
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}
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/*
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* Return number of decimals for the current market
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*/
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function getMaxDecimalPositions() {
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return getMarketConfig().maxDecimals;
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}
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/*
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* Return number of decimals for the current market
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*/
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function getMarketConfig() {
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return _.find(getExchangeProperties().markets, (p) => {
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return _.first(p.pair) === global.MARKET.assetA.toUpperCase() &&
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_.last(p.pair) === global.MARKET.assetB.toUpperCase();
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});
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}
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/*
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* Return number of decimals for the current market
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*/
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function getExchangeProperties() {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getExchangeProperties -> Entering function."); }
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return apiClient.getExchangeProperties();
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] getExchangeProperties -> err = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Returns the price for a given pair of assets.
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* The object returned is an array of trades:
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* ticker = {
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* bid, Number
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* ask, Number
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* last Number
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* };
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*/
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function getTicker(pMarket, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getTicker -> Entering function."); }
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apiClient.getTicker(pMarket, callBack);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] getTicker -> err = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Returns the open positions ath the exchange for a given market and user account.
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* The object returned is an array of positions
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*
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*/
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function getOpenPositions(pMarket, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getOpenPositions -> Entering function."); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getOpenPositions -> pMarket = " + JSON.stringify(pMarket)); }
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apiClient.getOpenPositions(pMarket, callBack);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] getOpenPositions -> Error = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Returns the trades for a given order number.
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* The object returned is an array of positions
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*/
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function getExecutedTrades(pPositionId, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getExecutedTrades -> Entering function."); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getExecutedTrades -> pPositionId = " + pPositionId); }
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apiClient.getExecutedTrades(pPositionId, callBack);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] getExecutedTrades -> Error = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Creates a new buy or sell order.
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* The orderNumber is returned. String
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*/
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function putPosition(pMarket, pType, pRate, pAmountA, pAmountB, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> Entering function."); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> pMarket = " + JSON.stringify(pMarket)); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> pType = " + pType); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> pRate = " + truncDecimals(pRate)); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> pAmountA = " + truncDecimals(pAmountA)); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] putPosition -> pAmountB = " + truncDecimals(pAmountB)); }
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let check = isValidOrder({
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market: getMarketConfig(),
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api: apiClient,
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amount: truncDecimals(pAmountB),
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price: truncDecimals(pRate)
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});
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if (check.valid) {
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if (pType === "buy") {
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apiClient.buy(pMarket.assetA, pMarket.assetB, truncDecimals(pRate), truncDecimals(pAmountB), callBack);
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return;
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}
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if (pType === "sell") {
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apiClient.sell(pMarket.assetA, pMarket.assetB, truncDecimals(pRate), truncDecimals(pAmountB), callBack);
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return;
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}
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logger.write(MODULE_NAME, "[ERROR] putPosition -> pType must be either 'buy' or 'sell'.");
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callBack(global.DEFAULT_FAIL_RESPONSE);
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} else {
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logger.write(MODULE_NAME, "[ERROR] putPosition -> The order is invalid: " + check.reason);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] putPosition -> err = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Move an existing position to the new rate.
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* The new orderNumber is returned.
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*/
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function movePosition(pPosition, pNewRate, pNewAmountB, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] movePosition -> Entering function."); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] movePosition -> pPosition = " + JSON.stringify(pPosition)); }
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] movePosition -> pNewRate = " + truncDecimals(pNewRate)); }
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apiClient.movePosition(pPosition, truncDecimals(pNewRate), truncDecimals(pNewAmountB), callBack);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] movePosition -> err = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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/*
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* Returns all the trade history from the Exchange since startTime to endTime orderd by tradeId.
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* It's possible that the exchange doesn't support this method.
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* The object returned is an array of trades:
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* trade = {
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* tradeID, String
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* globalTradeID, String
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* type, String
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* rate, Number
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* amountA, Number
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* amountB, Number
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* date Date
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* };
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*/
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function getPublicTradeHistory(assetA, assetB, startTime, endTime, callBack) {
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try {
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if (global.LOG_CONTROL[MODULE_NAME].logInfo === true) { logger.write(MODULE_NAME, "[INFO] getTradeHistory -> Entering function."); }
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apiClient.getPublicTradeHistory(assetA, assetB, startTime, endTime, callBack);
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} catch (err) {
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logger.write(MODULE_NAME, "[ERROR] getTradeHistory -> err = " + err.message);
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callBack(global.DEFAULT_FAIL_RESPONSE);
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}
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}
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};
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