Monitor Scripts

up-down-monitor.php

<?php

$search = 'Patient information'; // String to search for in the raw HTML
$url = 'http://leukaemialymphomaresearch.org.uk';
$repeat_delay = 1; // Time in hours between repeat notifications (you will get notifications more often if the site repeatedly goes up and down)

$peak_start = 6; // Time to start peak monitoring
$peak_end = 11; // Time to start off-peak monitoring

$timeout_peak = 10; //timeout in seconds during peak times
$timeout_offpeak = 60; //timeout in seconds during off-peak times (to allow for slowdown due to backups etc.)

$email_recipients = Array(
  "[email protected]",
  "[email protected]",
  "[email protected]",
  "[email protected]",
  "[email protected]",
  "[email protected]",
  "[email protected]",
);



// --------------------------------------------------------------------- //
//                 Do not change below this line                         //
// --------------------------------------------------------------------- //

$hour = date('G');
$timeout = (($hour >= $peak_start && $hour < $peak_end) || $peak_start >= $peak_end)?$timeout_peak:$timeout_offpeak;

$email_subject = 'Website Monitoring: ' . $url;

$content = Array();
$command = 'curl --max-time ' . $timeout . ' -s ' . $url . ' | grep -o -i "' . $search . '"'; 
exec($command, $content);
$matches = count($content);
$lockfile = '/tmp/' . preg_replace('/\//','-',$url) . '.lock';


if ($matches == 0) {
    if (!file_exists($lockfile) || time() - filectime($lockfile) > $repeat_delay * 3600 ) {
        touch($lockfile);
        status_alert("SITE DOWN\n\n".$url." appears to be down. (No response after ".$timeout."sec)\nPlease check ASAP.\n\n[AUTOMATED EMAIL]");
    }
} else {
    if (file_exists($lockfile)) {
        unlink($lockfile);
        status_alert("SITE UP\n\n".$url." appears to be back up\n\n[AUTOMATED EMAIL]");
    }
}

function status_alert ($message) {
global $email_recipients, $email_subject;
    foreach($email_recipients as $email_recipient) {
        mail($email_recipient, $email_subject, $message);
    }
}

website_monitor.php

<?php

// Monitors a URL for the appearance of a given string.
// Best to run as a cron job:
// */5 * * * * /usr/bin/php -q /path/to/script/website_monitor.php

$search = 'nexus 5';
    // String to search page for (case-insensitive)
$url = 'https://play.google.com/store/devices?hl=en_GB';
    // Page to search -- searches raw source code (via curl piped through grep)
$repeat_delay = 24;
    // Time in hours between repeat notifications


// ---------------------------------------

$content = Array();
$command = 'curl -s ' . $url . ' | grep -o -i "' . $search . '"'; 
exec($command, $content);
$matches = count($content);

if ($matches > 0) {
    $lockfile = '/tmp/' . preg_replace('/\//','-',$url) . '.lock';
    if (!file_exists($lockfile) || time() - filectime($lockfile) > $repeat_delay * 3600 ) {
        touch($lockfile);
        mail('[email protected]', 'Nexus 5 Appears Avaiable', "The string 'Nexus 5' was found on Google Play UK's 'Devices' page $matches times.\n\n[AUTOMATED EMAIL]");
        mail('[email protected]', 'Nexus 5 Appears Avaiable', "The string 'Nexus 5' was found on Google Play UK's 'Devices' page $matches times.\n\n[AUTOMATED EMAIL]");
    }
}