com.nubits.nubot.pricefeeds.feedservices.ExchangeratelabPriceFeed.java Source code

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Here is the source code for com.nubits.nubot.pricefeeds.feedservices.ExchangeratelabPriceFeed.java

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/*
 * Copyright (C) 2015 Nu Development Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package com.nubits.nubot.pricefeeds.feedservices;

import com.nubits.nubot.global.Passwords;
import com.nubits.nubot.models.Amount;
import com.nubits.nubot.models.CurrencyPair;
import com.nubits.nubot.models.LastPrice;
import com.nubits.nubot.pricefeeds.FeedFacade;
import com.nubits.nubot.utils.Utils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

public class ExchangeratelabPriceFeed extends AbstractPriceFeed {

    private static final Logger LOG = LoggerFactory.getLogger(ExchangeratelabPriceFeed.class.getName());

    public static final String name = FeedFacade.ExchangeratelabPriceFeed;

    public ExchangeratelabPriceFeed() {
        refreshMinTime = 8 * 60 * 60 * 1000; //8 hours
    }

    @Override
    public LastPrice getLastPrice(CurrencyPair pair) {
        long now = System.currentTimeMillis();
        long diff = now - lastRequest;
        if (diff >= refreshMinTime) {
            String url = getUrl(pair);
            String htmlString;
            try {
                htmlString = Utils.getHTML(url, true);
            } catch (IOException ex) {
                LOG.error(ex.toString());
                return new LastPrice(true, name, pair.getOrderCurrency(), null);
            }
            JSONParser parser = new JSONParser();
            try {
                JSONObject httpAnswerJson = (JSONObject) (parser.parse(htmlString));
                JSONArray array = (JSONArray) httpAnswerJson.get("rates");

                String lookingfor = pair.getOrderCurrency().getCode().toUpperCase();

                boolean found = false;
                double rate = -1;
                for (int i = 0; i < array.size(); i++) {
                    JSONObject temp = (JSONObject) array.get(i);
                    String tempCurrency = (String) temp.get("to");
                    if (tempCurrency.equalsIgnoreCase(lookingfor)) {
                        found = true;
                        rate = Utils.getDouble((Double) temp.get("rate"));
                        rate = Utils.round(1 / rate, 8);
                    }
                }

                lastRequest = System.currentTimeMillis();

                if (found) {

                    lastPrice = new LastPrice(false, name, pair.getOrderCurrency(),
                            new Amount(rate, pair.getPaymentCurrency()));
                    return lastPrice;
                } else {
                    LOG.warn("Cannot find currency " + lookingfor + " on feed " + name);
                    return new LastPrice(true, name, pair.getOrderCurrency(), null);
                }

            } catch (Exception ex) {
                LOG.error(ex.toString());
                lastRequest = System.currentTimeMillis();
                return new LastPrice(true, name, pair.getOrderCurrency(), null);
            }
        } else {
            LOG.warn("Wait " + (refreshMinTime - (System.currentTimeMillis() - lastRequest)) + " ms "
                    + "before making a new request. Now returning the last saved price\n\n");
            return lastPrice;
        }
    }

    private String getUrl(CurrencyPair pair) {
        return "http://api.exchangeratelab.com/api/current?apikey=" + Passwords.EXCHANGE_RATE_LAB;
    }
}