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UDPTransport.php
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UDPTransport.php
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<?php
/**
* @license GPL-2.0-or-later
* @file
*/
use Wikimedia\IPUtils;
/**
* A generic class to send a message over UDP
*
* If a message prefix is provided to the constructor or via
* UDPTransport::newFromString(), the payload of the UDP datagrams emitted
* will be formatted with the prefix and a single space at the start of each
* line. This is the payload format expected by the udp2log service.
*
* @since 1.25
*/
class UDPTransport {
// Limit to 64 KiB
public const MAX_PAYLOAD_SIZE = 65507;
private string $host;
private int $port;
/** @var bool|string */
private $prefix;
private int $domain;
/**
* @param string $host IP address to send to
* @param int $port port number
* @param int $domain AF_INET or AF_INET6 constant
* @param string|bool $prefix Prefix to use, false for no prefix
*/
public function __construct( $host, $port, $domain, $prefix = false ) {
$this->host = $host;
$this->port = $port;
$this->domain = $domain;
$this->prefix = $prefix;
}
/**
* @param string $info In the format of "udp://host:port/prefix"
* @return UDPTransport
*/
public static function newFromString( $info ) {
if ( preg_match( '!^udp:(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $info, $m ) ) {
// IPv6 bracketed host
$host = $m[1];
$port = intval( $m[2] );
$prefix = $m[3] ?? false;
$domain = AF_INET6;
} elseif ( preg_match( '!^udp:(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $info, $m ) ) {
$host = $m[1];
if ( !IPUtils::isIPv4( $host ) ) {
$host = gethostbyname( $host );
}
$port = intval( $m[2] );
$prefix = $m[3] ?? false;
$domain = AF_INET;
} else {
throw new InvalidArgumentException( __METHOD__ . ': Invalid UDP specification' );
}
return new self( $host, $port, $domain, $prefix );
}
/**
* @param string $text
*/
public function emit( $text ): void {
// Clean it up for the multiplexer
if ( $this->prefix !== false ) {
$text = preg_replace( '/^/m', $this->prefix . ' ', $text );
if ( strlen( $text ) > self::MAX_PAYLOAD_SIZE - 1 ) {
$text = substr( $text, 0, self::MAX_PAYLOAD_SIZE - 1 );
}
if ( !str_ends_with( $text, "\n" ) ) {
$text .= "\n";
}
} elseif ( strlen( $text ) > self::MAX_PAYLOAD_SIZE ) {
$text = substr( $text, 0, self::MAX_PAYLOAD_SIZE );
}
$sock = socket_create( $this->domain, SOCK_DGRAM, SOL_UDP );
if ( !$sock ) { // @todo should this throw an exception?
return;
}
socket_sendto( $sock, $text, strlen( $text ), 0, $this->host, $this->port );
socket_close( $sock );
}
}

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text/x-php
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Sat, Oct 3, 19:30 (2 d, 21 h ago)
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bc/4e/c67c531c47024268036da6f65f36
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UDPTransport.php (2 KB)

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