Scalr\Modules\Platforms\Ec2\Helpers\EipHelper::setEipForServer PHP Method

    public static function setEipForServer(DBServer $dbServer)
    {
        $db = \Scalr::getDb();
        try {
            $dbFarm = DBFarm::LoadByID($dbServer->farmId);
            $dbFarmRole = $dbServer->GetFarmRoleObject();
            if (!$dbFarmRole->GetSetting(Entity\FarmRoleSetting::AWS_USE_ELASIC_IPS)) {
                return false;
            }
            $aws = $dbFarm->GetEnvironmentObject()->aws($dbFarmRole->CloudLocation);
            $isVPC = $dbFarm->GetSetting(Entity\FarmSetting::EC2_VPC_ID);
        } catch (Exception $e) {
            \Scalr::getContainer()->logger(\LOG_CATEGORY::FARM)->fatal(new \FarmLogMessage($dbServer, sprintf(_("Cannot allocate elastic ip address for instance %s on farm %s (0)"), !empty($dbServer->serverId) ? $dbServer->serverId : null, !empty($dbFarm->Name) ? $dbFarm->Name : null)));
            return false;
        }
        $ip = $db->GetRow("\n            SELECT * FROM elastic_ips WHERE farmid=? AND ((farm_roleid=? AND instance_index=?) OR server_id = ?) LIMIT 1\n        ", array($dbServer->farmId, $dbFarmRole->ID, $dbServer->index, $dbServer->serverId));
        if ($ip['ipaddress']) {
            if (!self::checkElasticIp($ip['ipaddress'], $aws)) {
                \Scalr::getContainer()->logger(\LOG_CATEGORY::FARM)->warn(new \FarmLogMessage($dbServer, sprintf(_("Elastic IP '%s' does not belong to you. Allocating new one."), !empty($ip['ipaddress']) ? $ip['ipaddress'] : null)));
                $db->Execute("DELETE FROM elastic_ips WHERE ipaddress=?", array($ip['ipaddress']));
                $ip = false;
            }
        }
        if ($ip && $ip['ipaddress'] == $dbServer->remoteIp) {
            return $ip['ipaddress'];
        }
        // If free IP not found we must allocate new IP
        if (!$ip) {
            $alocatedIps = $db->GetOne("SELECT COUNT(*) FROM elastic_ips WHERE farm_roleid = ?", array($dbFarmRole->ID));
            // Check elastic IPs limit. We cannot allocate more than 'Max instances' option for role
            if (!$dbFarmRole->GetSetting(Entity\FarmRoleSetting::SCALING_ENABLED) || $alocatedIps < $dbFarmRole->GetSetting(Entity\FarmRoleSetting::SCALING_MAX_INSTANCES)) {
                try {
                    $domain = null;
                    if ($isVPC) {
                        $domain = 'vpc';
                    }
                    $address = $aws->ec2->address->allocate($domain);
                } catch (Exception $e) {
                    \Scalr::getContainer()->logger(\LOG_CATEGORY::FARM)->error(new \FarmLogMessage($dbServer, sprintf(_("Cannot allocate new elastic ip for instance '%s': %s"), !empty($dbServer->serverId) ? $dbServer->serverId : null, $e->getMessage())));
                    return false;
                }
                // Add allocated IP address to database
                $db->Execute("\n                    INSERT INTO elastic_ips\n                    SET env_id=?,\n                        farmid=?,\n                        farm_roleid=?,\n                        ipaddress=?,\n                        clientid=?,\n                        instance_index=?,\n                        allocation_id=?,\n                        state='0', server_id=''\n                ", array($dbServer->envId, $dbServer->farmId, $dbServer->farmRoleId, $address->publicIp, $dbServer->clientId, $dbServer->index, $address->allocationId));
                $ip = array('ipaddress' => $address->publicIp, 'allocation_id' => $address->allocationId);
                \Scalr::getContainer()->logger(\LOG_CATEGORY::FARM)->info(new \FarmLogMessage($dbServer, sprintf(_("Allocated new IP: %s"), $ip['ipaddress'])));
                // Waiting...
                sleep(5);
            } else {
                \Scalr::getContainer()->logger(__CLASS__)->fatal(_("Limit for elastic IPs reached. Check zomby records in database."));
            }
        }
        if ($ip['ipaddress']) {
            $allocationId = null;
            if ($isVPC) {
                $allocationId = $ip['allocation_id'];
            }
            self::associateIpAddress($dbServer, $ip['ipaddress'], $allocationId);
            // Update leastic IPs table
            $db->Execute("UPDATE elastic_ips SET state='1', server_id=? WHERE ipaddress=?", array($dbServer->serverId, $ip['ipaddress']));
            /*
             * DO NOT FIRE THIS EVENT AND LET POLLER TO FIND OUT THAT IP WAS CHANGED AND
             * FIRE EVENT. BY THIS TIME MOST LIKELY IP WILL BE ROUTABLE
            \Scalr::FireEvent($dbServer->farmId, new \IPAddressChangedEvent(
                $dbServer, $ip['ipaddress'], $dbServer->localIp
            ));
            */
        } else {
            \Scalr::getContainer()->logger(\LOG_CATEGORY::FARM)->fatal(new \FarmLogMessage($dbServer, sprintf(_("Cannot allocate elastic ip address for instance %s on farm %s (2)"), !empty($dbServer->serverId) ? $dbServer->serverId : null, !empty($dbFarm->Name) ? $dbFarm->Name : null)));
            return false;
        }
        return $ip['ipaddress'];
    }

 /**
  * Allocate and Assign Elastic IP to instance if role use it.
  *
  * @param HostUpEvent $event
  */
 public function OnHostUp(\HostUpEvent $event)
 {
     \Scalr\Modules\Platforms\Ec2\Helpers\EipHelper::setEipForServer($event->DBServer);
 }