Difference between revisions of "Advanced Cloud Hosting/Cloud API"

#!/usr/bin/php -q
<?php
// Script for resizing server memory using the XMission Cloud Infrastructure API

// Configuration

// Memory tolerances
define("LOWER_RAM_LIMIT", 256); # The lowest amount of memory for the server
define("UPPER_RAM_LIMIT", 1024); # The highest amount of memory for the server
define("LOWER_TOLERANCE", 0.25); # Decrease the memory if ratio is below this
define("UPPER_TOLERANCE", 0.8); # Increase the memory if ratio is above this
define("MEMORY_INCREMENT", 256); # Increment the memory by this amount

// The RESTful API
define("API_URL", "https://api.cloud.xmission.com:4464/paci/v1.0/");

// Your username and password for the API (same as your login to https://cp.xmission.com)
define("USER", '<YOUR_USER_NAME>');
define("PASS", '<YOUR_PASSWORD>');

// The name of the server - should match Control Panel's name of the server
define("VPS_HOST_NAME", 'webserver01');
// Check RAM usage
error_log("resize_check: Checking server RAM usage.");

// Get the raw memory output
$raw_output = shell_exec("free -o -m");
$memory_lines = explode("\n", $raw_output);
$current_memory = preg_split("/[\s:]+/",$memory_lines[1]);

// $current_memory[1] is total, $current_memory[2] is used
$current_memory_load = $current_memory[2] / $current_memory[1];
error_log("resize_check: Current memory use is: " . $current_memory_load) ;

// Is the current memory load in tolerance?
if (LOWER_TOLERANCE > $current_memory_load) {
    error_log("resize_check: Current memory usage of $current_memory_load below tolerance. Resizing.");

    $current_memory_setting = get_mem();
    error_log("resize_check: Current memory setting is: " . $current_memory_setting) ;

    if ($current_memory_setting > LOWER_RAM_LIMIT) {
        decrease_memory($current_memory_setting, MEMORY_INCREMENT);
        error_log("resize_check: Decreased memory by " . MEMORY_INCREMENT ) ;
    } else {
        error_log("resize_check: Could not decrease memory more, already at lowest limit.") ;
    }

    exit(0);
} else if ($current_memory_load > UPPER_TOLERANCE) {
    error_log("resize_check: Current memory usage of $current_memory_load above tolerance. Resizing.");

    $current_memory_setting = get_mem();
    error_log("resize_check: Current memory setting is: " . $current_memory_setting) ;

    if ($current_memory_setting < UPPER_RAM_LIMIT) {
        increase_memory($current_memory_setting, MEMORY_INCREMENT);
        error_log("resize_check: Increased memory by " . MEMORY_INCREMENT ) ;
    } else {
        error_log("resize_check: Could not increase memory more, already at highest limit.") ;
    }

    exit(0);
} else {
    error_log("resize_check: Current memory usage of $current_memory_load in tolerance. Exiting.");
    exit(0);
}
// Helper Functions
function get_mem() {
    $r_xml = req_rest('GET', VPS_HOST_NAME);
    return ((string) $r_xml->{'ram-size'}[0]);
}

function increase_memory($current, $increase_by) {
    $size_to_increase_to = $current + $increase_by;
    error_log("resize_check: setting memory to: " . $size_to_increase_to);
    $xml = '<?xml version="1.0" encoding="UTF-8"?>' .
    "<reconfigure-ve><ram-size>$size_to_increase_to</ram-size></reconfigure-ve>";

    $result = req_rest("PUT", VPS_HOST_NAME, $xml);
    return $result;
}

function decrease_memory($current, $decrease_by) {
    $size_to_decrease_to = $current - $decrease_by;
    error_log("resize_check: setting memory to: " . $size_to_decrease_to);
    $xml = '<?xml version="1.0" encoding="UTF-8"?>' .
    "<reconfigure-ve><ram-size>$size_to_decrease_to</ram-size></reconfigure-ve>";

    $result = req_rest("PUT", VPS_HOST_NAME, $xml);
    return $result;
}

function req_rest($method, $get_params = "", $parameters = "", $additional_headers = "") {
    $process = curl_init();
    curl_setopt($process, CURLOPT_HTTPHEADER, array('Content-Type: application/xml', $additional_headers));
    //curl_setopt($process, CURLOPT_VERBOSE, 1);
    curl_setopt($process, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($process, CURLOPT_SSL_VERIFYHOST, 0);
    //curl_setopt($process, CURLOPT_HEADER, 1);
    curl_setopt($process, CURLOPT_USERPWD, USER. ":" . PASS);
    curl_setopt($process, CURLOPT_TIMEOUT, 30);

    switch($method) {
        case 'POST':
            curl_setopt($process, CURLOPT_POST, 1);
            curl_setopt($process, CURLOPT_POSTFIELDS, array($parameters));
            break;
        case 'PUT':
            curl_setopt($process, CURLOPT_CUSTOMREQUEST, "PUT");
            curl_setopt($process, CURLOPT_POSTFIELDS, $parameters);
        case 'GET':
            default:
            break;
    }

    curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($process, CURLOPT_URL, API_URL . "ve/" . $get_params);
    $return = curl_exec($process);
    curl_close($process);

    if (strpos($return, '<') !== false) {
        $xml = new SimpleXmlElement($return);
        return $xml;
    } else {
        return $return;
    }
}