Compare price on btc38 and okcoin

btc38-okcoin-price-compare.php

#! /usr/bin/php
<?php
/**
 * btc38-okcoin-price-compare.php
 *
 * Copyright 2014 Fwolf <[email protected]>
 * All rights reserved.
 *
 * Distributed under the MIT License.
 * http://opensource.org/licenses/mit-license
 *
 * Compare price on btc38 and okcoin, use CNY currency.
 *
 * @copyright   Copyright 2014 Fwolf
 * @author      Fwolf <[email protected]>
 * @license     http://opensource.org/licenses/mit-license MIT
 * @since       2014-01-06
 * @version     1.0
 */

use Fwlib\Net\Curl;
use Fwlib\Util\UtilContainer;

// Include
require 'fwlib/autoload.php';


// Check parameter amount, at least 2 param needed
if (3 > $argc) {
    printUsage();
    exit(-1);
}



// Main body
$coinName = $argv[1];
$percentThreshold = $argv[2] / 100;

$curl = new Curl;

$utilContainer = UtilContainer::getInstance();
$env = $utilContainer->get('Env');


// Start a endless loop with pause
while (true) {
    try {
        // Query Okcoin first
        $url = 'http://www.okcoin.com/api/depth.do?symbol=' .
            strtolower($coinName) . '_cny';
        $result = json_decode($curl->get($url), true);

        $ar = array_pop($result['asks']);
        $lowestSellOnOkcoin = array(
            'price'  => $ar[0],
            'amount' => $ar[1],
        );

        $ar = array_shift($result['bids']);
        $highestBuyOnOkcoin = array(
            'price'  => $ar[0],
            'amount' => $ar[1],
        );


        // Then query btc38
        $url = 'http://www.btc38.com/trade/getTradeList.php?coinname=' .
            strtolower($coinName);
        $result = $curl->get($url);
        if ('{' != $result{0}) {
            // Remove BOM
            $result = substr($result, 3);
        }
        $result = json_decode($result, true);

        $lowestSellOnBtc38 = array_shift($result['sellOrder']);
        $highestBuyOnBtc38 = array_shift($result['buyOrder']);


        // Compare
        $btc38ToOkcoin = round(
            $highestBuyOnOkcoin['price'] - $lowestSellOnBtc38['price'],
            2
        );
        $btc38ToOkcoinPercent = round(
            $btc38ToOkcoin / $lowestSellOnBtc38['price'] * 100,
            2
        );
        $env->ecl(
            "btc38 {$lowestSellOnBtc38['price']} --> " .
            "okcoin {$highestBuyOnOkcoin['price']} : " .
            "$btc38ToOkcoin / $btc38ToOkcoinPercent% * " .
            min($lowestSellOnBtc38['amount'], $highestBuyOnOkcoin['amount'])
        );

        $okcoinToBtc38 = round(
            $highestBuyOnBtc38['price'] - $lowestSellOnOkcoin['price'],
            2
        );
        $okcoinToBtc38Percent = round(
            $okcoinToBtc38 / $lowestSellOnOkcoin['price'] * 100,
            2
        );
        $env->ecl(
            "okcoin {$lowestSellOnOkcoin['price']} --> " .
            "btc38 {$highestBuyOnBtc38['price']} : " .
            "$okcoinToBtc38 / $okcoinToBtc38Percent% * " .
            min($lowestSellOnOkcoin['amount'], $highestBuyOnBtc38['amount'])
        );

        $env->ecl();

    } catch (\Exception $e) {
        $env->ecl($e->getMessage());
    }

    sleep(12);
}



// Functions define

/**
 * Print usage message
 */
function printUsage()
{
    $s = basename(__FILE__);
    echo <<<EOF
Usage: $s CoinName Percent

Parameters:
  CoinName      BTC or LTC
  Percent       Only print price spread large than Percent%

EOF;
}


/**
 * ChangeLog
 *
 * v1.0
 *  - Basic feature: claw, compare and print
 */