Send reminder when trade price reach setting criteria.

btc38-reminder.php

#! /usr/bin/php
<?php
/**
 * btc38-reminder.php
 *
 * Copyright 2013 Fwolf <fwolf.aide+bin.public@gmail.com>
 * All rights reserved.
 *
 * Distributed under the MIT License.
 * http://opensource.org/licenses/mit-license
 *
 * Send reminder when trade price reach setting criteria.
 *
 * Suggest use xfce4-notifyd, supports expired-time option, which
 * nitification-daemon doesn't. The execute file path in Arch Linux is
 * '/usr/lib/xfce4/notifyd/xfce4-notifyd`.
 *
 * @copyright   Copyright 2013 Fwolf
 * @author      Fwolf <fwolf.aide+gist@gmail.com>
 * @license     http://opensource.org/licenses/mit-license MIT
 * @since       2013-12-29
 * @version     1.0
 */

use Fwlib\Net\Curl;

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


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



// Main body
$url = 'http://www.btc38.com/trade/getTradeList.php?coinname=' .
    strtoupper($argv[1]);
$curl = new Curl;

$priceMin = floatval($argv[2]);
$priceMax = isset($argv[3]) ? floatval($argv[3]) : 0;

if (0 == $priceMax) {
    sendNotify("Monitor for price lower than $priceMin");
} else {
    sendNotify("Monitor for price out of $priceMin and $priceMax");
}

// Start a endless loop with pause
while (true) {
    $result = $curl->get($url);
    if ('{' != $result{0}) {
        // Remove BOM
        $result = substr($result, 3);
    }

    $result = json_decode($result, true);

    if (is_null($result)) {
        sendNotify('Curl Error');

    } else {
        $mostRecentTrade = $result['trade'][0];
        $price = floatval($mostRecentTrade['price']);

        if (0 != $priceMin && $price <= $priceMin) {
            sendNotify(
                'Low price',
                "$price with amount " . $mostRecentTrade['volume']
            );
        } elseif (0 != $priceMax && $price >= $priceMax) {
            sendNotify(
                'High price',
                "$price with amount " . $mostRecentTrade['volume']
            );
        }
    }

    sleep(42);
}



// Functions define

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

Parameters:
  -Min          Send reminder when trade price lower than this, 0 to disable.
  -Max          Send reminder when trade price higher than this, 0 to disable.

EOF;
}


/**
 * Send notify
 *
 * @param   string  $title
 * @param   string  $message
 */
function sendNotify($title, $message = '')
{
    $cmd = "notify-send -t 42000 '$title'";
    if (!empty($message)) {
        $cmd .= " '$message'";
    }

    exec($cmd);
    echo "$title: $message\n";
}


/**
 * ChangeLog
 *
 * v1.0
 *  - Basic feature, claw and notify
 */