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<?php
/**
* @copyright Copyright (c) 2016 Robin Appelman <robin@icewind.nl>
* This file is licensed under the Licensed under the MIT license:
* http://opensource.org/licenses/MIT
*
*/
namespace Icewind\SMB;
use Icewind\SMB\Exception\Exception;
class NotifyHandler implements INotifyHandler {
/**
* @var Connection
*/
private $connection;
/**
* @var string
*/
private $path;
private $listening = true;
// todo replace with static once <5.6 support is dropped
// see error.h
private static $exceptionMap = [
ErrorCodes::RevisionMismatch => '\Icewind\SMB\Exception\RevisionMismatchException',
];
/**
* @param Connection $connection
* @param string $path
*/
public function __construct(Connection $connection, $path) {
$this->connection = $connection;
$this->path = $path;
}
/**
* Get all changes detected since the start of the notify process or the last call to getChanges
*
* @return Change[]
*/
public function getChanges() {
if (!$this->listening) {
return [];
}
stream_set_blocking($this->connection->getOutputStream(), 0);
$lines = [];
while (($line = $this->connection->readLine())) {
$this->checkForError($line);
$lines[] = $line;
}
stream_set_blocking($this->connection->getOutputStream(), 1);
return array_values(array_filter(array_map([$this, 'parseChangeLine'], $lines)));
}
/**
* Listen actively to all incoming changes
*
* Note that this is a blocking process and will cause the process to block forever if not explicitly terminated
*
* @param callable $callback
*/
public function listen($callback) {
if ($this->listening) {
$this->connection->read(function ($line) use ($callback) {
$this->checkForError($line);
$change = $this->parseChangeLine($line);
if ($change) {
return $callback($change);
}
});
}
}
private function parseChangeLine($line) {
$code = (int)substr($line, 0, 4);
if ($code === 0) {
return null;
}
$subPath = str_replace('\\', '/', substr($line, 5));
if ($this->path === '') {
return new Change($code, $subPath);
} else {
return new Change($code, $this->path . '/' . $subPath);
}
}
private function checkForError($line) {
if (substr($line, 0, 16) === 'notify returned ') {
$error = substr($line, 16);
throw Exception::fromMap(self::$exceptionMap, $error, 'Notify is not supported with the used smb version');
}
}
public function stop() {
$this->listening = false;
$this->connection->close();
}
public function __destruct() {
$this->stop();
}
}