Monitor STEEM RPC Nodes with PHP Crontab Job

I have 5 API nodes for STEEM - and I have written a crontab job (in PHP) that runs every minute - sending request to these nodes to check their availability - in case of failures, I'll get email notification immediately.

See https://steemyy.com/witness-nodes.php

$nodes = array(
    "api.steemyy.com" => "https://api.steemyy.com",
    "api.justyy.com" => "https://api.justyy.com",
    "steem.justyy.workers.dev" => "https://steem.justyy.workers.dev",
    "aws.lambda-ap-northeast-1" => "https://x68bp3mesd.execute-api.ap-northeast-1.amazonaws.com/release",
    "aws.lambda-us-east-1" => "https://e51ewpb9dk.execute-api.us-east-1.amazonaws.com/release"
);

foreach ($nodes as $key=>$node) {
    $logfile = "/var/log/" . $key ."-" . date("Y-m-d-H") . ".txt";
    $report = "STEEM node check for $node..\n";
    echo "STEEM node check for $node..\n";
    $send_email = file_exists($logfile);
    for ($i = 0; $i < 10; ++ $i) {
      $code = statusCode($node);
      if ($code == 200) break;
      usleep(100000);
    }
    $ok = true;
    if ($code != 200) {
        $ok = false;
        $report .= "code = $code\n";
    } else {
        $data = file_get_contents($node);
        $json = json_decode($data, true);
        if ((!$data) || (!$json) || ($json['status'] !== 'OK') || ($json['docker_tag'] != 'latest')) {
            $report .= "Status Not OK: $data\n";
            $ok = false;
            echo "Status NO OK.\n";
        }
    }
    if (!$ok) {
        echo $report;
        if (is_file($logfile)) {       
            $x = trim(file_get_contents($logfile));
            file_put_contents($logfile, $x . "\n" .$report);
        } else {
            file_put_contents($logfile, $report);
            // first time in his hour, then send email to alarm
            sendEmail("STEEM node check for $node..", $report);
            usleep(100000);
        }       
    }  else {
        echo "OK.\n";
    }
}

@steemcurator01
@steemcurator02
@steemcurator03
@steemcurator04
@steemcurator05
@steemcurator06
@steemcurator07
@steemcurator08
@steemcurator09

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Thank you for reading ^^^^^^^^^^^^^^^

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