LibreNMS/Cache/Device.php
<?php
/**
* Device.php
*
* -Description-
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* @link https://www.librenms.org
*
* @copyright 2019 Tony Murray
* @author Tony Murray <murraytony@gmail.com>
*/
namespace LibreNMS\Cache;
class Device
{
/** @var \App\Models\Device[] */
private array $devices = [];
private ?int $primary = null;
/**
* Gets the current primary device.
*
* @return \App\Models\Device
*/
public function getPrimary(): \App\Models\Device
{
return $this->get($this->primary);
}
/**
* Set the primary device.
* This will be fetched by getPrimary()
*
* @param int $device_id
*/
public function setPrimary(int $device_id): void
{
$this->primary = $device_id;
}
/**
* Check if a primary device is set
*/
public function hasPrimary(): bool
{
return $this->primary !== null;
}
/**
* Get a device by device_id or hostname
*
* @param int|string|null $device device_id or hostname
* @return \App\Models\Device
*/
public function get(int|string|null $device): \App\Models\Device
{
if ($device === null) {
return new \App\Models\Device;
}
// if string input is not an integer, get by hostname
if (is_string($device) && ! ctype_digit($device)) {
return $this->getByHostname($device);
}
// device is not be loaded, try to load it
return $this->devices[$device] ?? $this->load($device);
}
/**
* Get a device by hostname
*
* @param string|null $hostname
* @return \App\Models\Device
*/
public function getByHostname($hostname): \App\Models\Device
{
$device_id = array_column($this->devices, 'device_id', 'hostname')[$hostname] ?? 0;
return $this->devices[$device_id] ?? $this->load($hostname, 'hostname');
}
/**
* Ignore cache and load the device fresh from the database
*
* @param int $device_id
* @return \App\Models\Device
*/
public function refresh(?int $device_id): \App\Models\Device
{
unset($this->devices[$device_id]);
return $this->get($device_id);
}
/**
* Flush the cache
*/
public function flush(): void
{
$this->devices = [];
}
/**
* Check if the device id is currently loaded into cache
*/
public function has(int $device_id): bool
{
return isset($this->devices[$device_id]);
}
private function load(mixed $value, string $field = 'device_id'): \App\Models\Device
{
$device = \App\Models\Device::query()->where($field, $value)->first();
if (! $device) {
return new \App\Models\Device;
}
$this->devices[$device->device_id] = $device;
return $device;
}
}