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<?php
/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
namespace Icinga\Module\Icingadb\Command\Transport;
use Exception;
use Icinga\Application\Config;
use Icinga\Application\Logger;
use Icinga\Data\ConfigObject;
use Icinga\Exception\ConfigurationError;
use Icinga\Module\Icingadb\Command\IcingaCommand;
/**
* Command transport
*/
class CommandTransport implements CommandTransportInterface
{
/**
* Transport configuration
*
* @var Config
*/
protected static $config;
/**
* Get transport configuration
*
* @return Config
*
* @throws ConfigurationError
*/
public static function getConfig(): Config
{
if (static::$config === null) {
$config = Config::module('icingadb', 'commandtransports');
if ($config->isEmpty()) {
throw new ConfigurationError(
t('No command transports have been configured in "%s".'),
$config->getConfigFile()
);
}
static::$config = $config;
}
return static::$config;
}
/**
* Create a transport from config
*
* @param ConfigObject $config
*
* @return ApiCommandTransport
*
* @throws ConfigurationError
*/
public static function createTransport(ConfigObject $config): ApiCommandTransport
{
$config = clone $config;
switch (strtolower($config->transport)) {
case ApiCommandTransport::TRANSPORT:
$transport = new ApiCommandTransport();
break;
default:
throw new ConfigurationError(
t('Cannot create command transport "%s". Invalid transport defined in "%s". Use one of: %s.'),
$config->transport,
static::getConfig()->getConfigFile(),
join(', ', [ApiCommandTransport::TRANSPORT])
);
}
unset($config->transport);
foreach ($config as $key => $value) {
$method = 'set' . ucfirst($key);
if (! method_exists($transport, $method)) {
// Ignore settings from config that don't have a setter on the transport instead of throwing an
// exception here because the transport should throw an exception if it's not fully set up
// when being about to send a command
continue;
}
$transport->$method($value);
}
return $transport;
}
/**
* Send the given command over an appropriate Icinga command transport
*
* This will try one configured transport after another until the command has been successfully sent.
*
* @param IcingaCommand $command The command to send
* @param int|null $now Timestamp of the command or null for now
*
* @throws CommandTransportException If sending the Icinga command failed
*
* @return mixed
*/
public function send(IcingaCommand $command, int $now = null)
{
$errors = [];
foreach (static::getConfig() as $name => $transportConfig) {
$transport = static::createTransport($transportConfig);
try {
$result = $transport->send($command, $now);
} catch (CommandTransportException $e) {
Logger::error($e);
$errors[] = sprintf('%s: %s.', $name, rtrim($e->getMessage(), '.'));
continue; // Try the next transport
}
return $result; // The command was successfully sent
}
if (! empty($errors)) {
throw new CommandTransportException(implode("\n", $errors));
}
throw new CommandTransportException(t(
'Failed to send external Icinga command. No transport has been configured'
. ' for this instance. Please contact your Icinga Web administrator.'
));
}
}
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