function main($server_cfg)
{
global $mysql_pdo, $pool_name, $game_name, $deregistered_ips;
$relative_path = realpath(dirname(__FILE__));
$options = get_options();
if (isset($options['a']) && $options['a'] !== '') {
$array_id = $options['a'];
} else {
die("Array ID not provided\n");
}
$query = "select distinct hostgroup,deploy_id,private_ip from instances where array_id={$array_id}";
$stmt = $mysql_pdo->prepare($query);
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
if ($rows) {
$ip_list = array();
$row = $rows[0];
$pool_name = $row['hostgroup'];
$deploy_id = $row['deploy_id'];
foreach ($rows as $key => $row) {
$ip_list[] = $row['private_ip'];
}
} else {
die("Could not map array id to hostgroup\n");
}
//Fetching the game name from the game_deploy_map.json file
$game_deploy_map = get_game_deploy_map($server_cfg);
if (isset($game_deploy_map[$deploy_id])) {
$game_name = $game_deploy_map[$deploy_id];
} else {
die("Unable to map game deployment id to game name\n");
}
$game_cfg = load_game_config($game_name);
// Getting the ip of loadbalancer to be hit
$f5_credentials = $game_cfg["f5_credentials"][$pool_name];
$f5_vip = $f5_credentials["f5_vip"];
//Fetching the target slack
$target_slack = $game_cfg["target_slack"][$pool_name];
if ($target_slack <= 0) {
die("Unable to proceed as the target slack is less than or equal to zero\n");
}
$pool_data = get_instance_count_slack_offset($game_name, $pool_name);
//Delete any previous rollback file existing
unlink_rollback_file($server_cfg, $game_name, $pool_name);
$instance_count = count($ip_list);
$slack_offset = $pool_data['slack'];
$opt_inst_count = $pool_data['optimal_instance_count'];
//Getting the current slack via api from the zmon machine.
$current_slack = get_current_slack($game_name, $pool_name, $instance_count);
if ($current_slack < $slack_offset) {
die("Unable to proceed as the current slack is less than the 1 day lowest slack.\n");
}
//Setting the target slack relative to the slack offset and finding the optimal instance count for acheving it.
$target_slack = $target_slack + ($current_slack - $slack_offset);
if ($target_slack >= $current_slack) {
die("Unable to proceed as the target slack is greater than current slack\n");
}
//Calculating the optimal instance count for the target slack
$opt_inst_count_target = $target_slack * ($instance_count - $opt_inst_count) / $slack_offset + $opt_inst_count;
$opt_inst_count_target = round($opt_inst_count_target);
if ($opt_inst_count_target <= 0) {
die("Unable to proceed as the optimal instance count required for target slack is less then or equal to 0\n");
}
echo "Current slack = {$current_slack}%\nCurrent Instance Count = {$instance_count}\nTarget slack = {$target_slack}%\nOptimal count for target slack = {$opt_inst_count_target}\n\n";
$iteration_count = 0;
/* FETCH THE INITIAL PRT from all the nodes and store it */
echo "Calculating initial page response times...\n";
$initial_page_pdt_array = get_pdt_per_page($f5_vip, count($ip_list));
$prev_pdt = $initial_page_pdt_array;
foreach ($initial_page_pdt_array as $page => $pdt_data) {
echo "Page Delivery time for page {$page} is " . $pdt_data[2] . " ms\n";
}
echo "\n";
//Fetching the tolerable pdt limit percent from the game cfg file
$pdt_diff_tol_percent = $game_cfg["pdt_diff_tol_percent"];
while ($iteration_count < 5) {
$instance_count = count($ip_list);
$count_overflow = $instance_count - $opt_inst_count_target;
$count_deregister = (int) ($count_overflow / 2);
//Deregister the first (count_overflow) / 2 nodes from the ip_list and wait for 5 minutes
if ($count_overflow > 2) {
echo "Deregistering {$count_deregister} nodes from F5...\n";
$deregister_ips = array_slice($ip_list, 0, $count_deregister);
$deregister_ip_list = json_encode($deregister_ips);
$deregister_ip_list = substr($deregister_ip_list, 1, -1);
//Deregister $count_deregister nodes from F5 parallelly
system("php {$relative_path}/deregister_node.php -g {$game_name} -p {$pool_name} -i {$deregister_ip_list}", $exit_code);
if ($exit_code == 0) {
echo "Failed to complete the deregistration process. Exiting.\n";
exit(0);
}
$ip_list = array_slice($ip_list, $count_deregister);
$deregistered_ips = array_merge($deregistered_ips, $deregister_ips);
update_zmon_machines($game_cfg, $deregistered_ips);
} else {
echo "The current instance count ({$instance_count}) is almost optimal for the target slack.\n";
$current_slack = get_current_slack($game_name, $pool_name, $instance_count);
print_final_result($current_slack, count($ip_list), $deregistered_ips);
}
//Wait for 5 minutes for the changes to take place
wait_for_change(5);
//Calculate the current slack
$current_slack_after_dereg = get_current_slack($game_name, $pool_name, count($ip_list));
/* FETCH THE PRT from all the nodes and store it. Also Compare the PRT */
//Flag to check if the pdt diff is huge so as to terminate the workflow in this iteration
$pdt_stop_iteration = false;
while (true) {
$pdt_huge_diff = false;
$current_page_pdt_array = get_pdt_per_page($f5_vip, count($ip_list), $prev_pdt);
$prev_pdt = $current_page_pdt_array;
foreach ($current_page_pdt_array as $page => $pdt_data) {
$pdt_diff = $pdt_data[2] - $initial_page_pdt_array[$page][2];
$diff_tol = $pdt_diff_tol_percent / 100 * $initial_page_pdt_array[$page][2];
echo "Checking PDT for {$page} .... (" . $pdt_data[2] . " ms) .... ";
if ($pdt_diff > $diff_tol) {
echo "\nPDT (" . $pdt_data[2] . " ms) increased more than {$pdt_diff_tol_percent} % for page {$page}.\n\n";
$pdt_stop_iteration = true;
$pdt_huge_diff = true;
} else {
echo "OK\n";
}
}
//If the pdt difference is intolerable then register $count_deregister/2 nodes wait for 5 mins and check again.
if ($pdt_huge_diff) {
$count_register = ceil($count_deregister / 2);
if (count($deregistered_ips) < $count_register) {
$count_register = count($deregistered_ips);
}
if (empty($deregistered_ips)) {
echo "All the nodes have been registerd.Still pdt difference is high...\n";
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips);
}
echo "Registering {$count_register} nodes .... \n";
$register_ips = array_slice($deregistered_ips, 0, $count_register);
$register_ip_list = json_encode($register_ips);
$register_ip_list = substr($register_ip_list, 1, -1);
system("php {$relative_path}/register_node.php -g {$game_name} -p {$pool_name} -i {$register_ip_list}", $exit_code);
if ($exit_code == 0) {
echo "Failed to complete the Registration process. Exiting.\n";
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips, false);
}
$ip_list = array_merge($ip_list, $register_ips);
$deregistered_ips = array_slice($deregistered_ips, $count_register);
update_zmon_machines($game_cfg, $deregistered_ips);
//Wait for 5 minutes for the changes to take place
wait_for_change(5);
} else {
break;
}
}
$current_slack_after_dereg = get_current_slack($game_name, $pool_name, count($ip_list));
if ($current_slack_after_dereg > $target_slack) {
echo "Current slack ({$current_slack_after_dereg} %) is greater than target slack ({$target_slack} %). continuing .....\n";
} else {
if ($current_slack_after_dereg == $target_slack) {
echo "Current slack ({$current_slack_after_dereg} %) is equal to target slack. Slack reduction completed successfully...\n";
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips);
} else {
// Current slack is less than the target slack - add $count_deregister/2 nodes, wait for 5 mins and check slack again.
echo "Current slack ({$current_slack_after_dereg} %) is less than target slack ({$target_slack} %)\n";
$count_register = ceil($count_deregister / 2);
while ($current_slack_after_dereg < $target_slack) {
if (count($deregistered_ips) < $count_register) {
$count_register = count($deregistered_ips);
}
if (empty($deregistered_ips)) {
echo "All the ips have been registered...\n";
break;
}
echo "Registering {$count_register} nodes .... \n";
$register_ips = array_slice($deregistered_ips, 0, $count_register);
$register_ip_list = json_encode($register_ips);
$register_ip_list = substr($register_ip_list, 1, -1);
system("php {$relative_path}/register_node.php -g {$game_name} -p {$pool_name} -i {$register_ip_list}", $exit_code);
if ($exit_code == 0) {
echo "Failed to complete the Registration process. Exiting.\n";
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips, false);
}
$ip_list = array_merge($ip_list, $register_ips);
$deregistered_ips = array_slice($deregistered_ips, $count_register);
update_zmon_machines($game_cfg, $deregistered_ips);
//Wait for 5 minutes for the changes to take place
wait_for_change(5);
$current_slack_after_dereg = get_current_slack($game_name, $pool_name, count($ip_list));
}
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips);
}
}
if ($pdt_stop_iteration) {
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips);
}
$iteration_count++;
}
if ($iteration_count >= $limit) {
echo "{$iteration_count} iterations completed!\n";
print_final_result($current_slack_after_dereg, count($ip_list), $deregistered_ips);
}
}
// $val = $hostgroupConfigObj->get_config_column_names();
foreach($common_config_array as $key=>$yaml_str){
var_dump($key);
echo "<br>";
foreach($yaml_str as $key => $val)
var_dump($yaml_str);
echo "<br><br>";
}
*/
// var_dump($final_yaml_array);
echo "<div id='welcome'> Welcome <b>" . $_SERVER['REMOTE_USER'] . "</b></div>";
$class_list = array("", "web", "mc", "mb", "db", "proxy", "msched", "mqueue", "nagios", "consumer", "gib");
$i = 1;
//var_dump($final_yaml_array);
echo "<div id='hosts'>\r\n <textarea id='host_count' readonly></textarea>\r\n </div>";
$summary_data = get_instance_count_slack_offset($game);
// foreach($hostgroups_array as $hostgroups){
foreach ($final_yaml_array as $regex => $metric) {
$hostgroups = $metric["hostgroup"];
$flag = FALSE;
echo "<div id='hostgroups{$i}' class='hosts'>\r\n\t\t\t\t<label onclick=processclick({$i},'{$hostgroups}') class='heading'>{$hostgroups}</label>\r\n\t\t\t\t<img id='delete_{$id}' src='/zperfmon/admin/images/delete.jpg' alt='Delete Hostgroup' onclick=processDelete('hostgroups{$i}','{$hostgroups}')>";
if (isset($summary_data[$hostgroups])) {
echo "<div id='summary_{$i}' class='summary'>Instance Count : " . $summary_data[$hostgroups]["count"] . "<br>Slack : " . $summary_data[$hostgroups]["slack"] . "</div>";
}
echo "<div id='class_name{$i}' class='hidden'>\r\n\t\t\t\t<label>Class: </label>\r\n\t\t\t\t\r\n\t\t\t<select name='class' id='class_list{$i}' onchange=processChange({$i},'{$hostgroups}')>";
foreach ($class_list as $class) {
if ($class == $metric["class"]) {
echo "<option name={$class} value={$class} selected>{$class}</option>";
$flag = TRUE;
} else {
echo "<option name={$class} value={$class}>{$class}</option>";