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<?php
namespace PhpAmqpLib\Wire\IO;
use PhpAmqpLib\Exception\AMQPConnectionClosedException;
use PhpAmqpLib\Exception\AMQPIOException;
use PhpAmqpLib\Exception\AMQPSocketException;
use PhpAmqpLib\Exception\AMQPTimeoutException;
use PhpAmqpLib\Helper\MiscHelper;
use PhpAmqpLib\Helper\SocketConstants;
class SocketIO extends AbstractIO
{
/** @var null|resource */
private $sock;
/**
* @param string $host
* @param int $port
* @param int|float $read_timeout
* @param bool $keepalive
* @param int|float|null $write_timeout if null defaults to read timeout
* @param int $heartbeat how often to send heartbeat. 0 means off
*/
public function __construct(
$host,
$port,
$read_timeout = 3,
$keepalive = false,
$write_timeout = null,
$heartbeat = 0
) {
$this->host = $host;
$this->port = $port;
$this->read_timeout = (float)$read_timeout;
$this->write_timeout = (float)($write_timeout ?: $read_timeout);
$this->heartbeat = $heartbeat;
$this->initial_heartbeat = $heartbeat;
$this->keepalive = $keepalive;
$this->canDispatchPcntlSignal = $this->isPcntlSignalEnabled();
/*
TODO FUTURE enable this check
php-amqplib/php-amqplib#648, php-amqplib/php-amqplib#666
if ($this->heartbeat !== 0 && ($this->read_timeout <= ($this->heartbeat * 2))) {
throw new \InvalidArgumentException('read_timeout must be greater than 2x the heartbeat');
}
if ($this->heartbeat !== 0 && ($this->write_timeout <= ($this->heartbeat * 2))) {
throw new \InvalidArgumentException('send_timeout must be greater than 2x the heartbeat');
}
*/
}
/**
* @inheritdoc
*/
public function connect()
{
$this->sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
list($sec, $uSec) = MiscHelper::splitSecondsMicroseconds($this->write_timeout);
socket_set_option($this->sock, SOL_SOCKET, SO_SNDTIMEO, array('sec' => $sec, 'usec' => $uSec));
list($sec, $uSec) = MiscHelper::splitSecondsMicroseconds($this->read_timeout);
socket_set_option($this->sock, SOL_SOCKET, SO_RCVTIMEO, array('sec' => $sec, 'usec' => $uSec));
$this->setErrorHandler();
try {
$connected = socket_connect($this->sock, $this->host, $this->port);
$this->throwOnError();
} catch (\ErrorException $e) {
$connected = false;
} finally {
$this->restoreErrorHandler();
}
if (!$connected) {
$errno = socket_last_error($this->sock);
$errstr = socket_strerror($errno);
throw new AMQPIOException(sprintf(
'Error Connecting to server (%s): %s',
$errno,
$errstr
), $errno);
}
socket_set_block($this->sock);
socket_set_option($this->sock, SOL_TCP, TCP_NODELAY, 1);
if ($this->keepalive) {
$this->enable_keepalive();
}
$this->heartbeat = $this->initial_heartbeat;
}
/**
* @inheritdoc
*/
public function getSocket()
{
return $this->sock;
}
/**
* @inheritdoc
*/
public function read($len)
{
if (is_null($this->sock)) {
throw new AMQPSocketException(sprintf(
'Socket was null! Last SocketError was: %s',
socket_strerror(socket_last_error())
));
}
$this->check_heartbeat();
list($timeout_sec, $timeout_uSec) = MiscHelper::splitSecondsMicroseconds($this->read_timeout);
$read_start = microtime(true);
$read = 0;
$data = '';
while ($read < $len) {
$buffer = null;
$result = socket_recv($this->sock, $buffer, $len - $read, 0);
if ($result === 0) {
// From linux recv() manual:
// When a stream socket peer has performed an orderly shutdown,
// the return value will be 0 (the traditional "end-of-file" return).
// http://php.net/manual/en/function.socket-recv.php#47182
$this->close();
throw new AMQPConnectionClosedException('Broken pipe or closed connection');
}
if (empty($buffer)) {
$read_now = microtime(true);
$t_read = $read_now - $read_start;
if ($t_read > $this->read_timeout) {
throw new AMQPTimeoutException('Too many read attempts detected in SocketIO');
}
$this->select($timeout_sec, $timeout_uSec);
continue;
}
$read += mb_strlen($buffer, 'ASCII');
$data .= $buffer;
}
if (mb_strlen($data, 'ASCII') !== $len) {
throw new AMQPIOException(sprintf(
'Error reading data. Received %s instead of expected %s bytes',
mb_strlen($data, 'ASCII'),
$len
));
}
$this->last_read = microtime(true);
return $data;
}
/**
* @inheritdoc
*/
public function write($data)
{
// Null sockets are invalid, throw exception
if (is_null($this->sock)) {
throw new AMQPSocketException(sprintf(
'Socket was null! Last SocketError was: %s',
socket_strerror(socket_last_error())
));
}
$this->checkBrokerHeartbeat();
$written = 0;
$len = mb_strlen($data, 'ASCII');
$write_start = microtime(true);
while ($written < $len) {
$this->setErrorHandler();
try {
$this->select_write();
$buffer = mb_substr($data, $written, self::BUFFER_SIZE, 'ASCII');
$result = socket_write($this->sock, $buffer, self::BUFFER_SIZE);
$this->throwOnError();
} catch (\ErrorException $e) {
$code = socket_last_error($this->sock);
$constants = SocketConstants::getInstance();
switch ($code) {
case $constants->SOCKET_EPIPE:
case $constants->SOCKET_ENETDOWN:
case $constants->SOCKET_ENETUNREACH:
case $constants->SOCKET_ENETRESET:
case $constants->SOCKET_ECONNABORTED:
case $constants->SOCKET_ECONNRESET:
case $constants->SOCKET_ECONNREFUSED:
case $constants->SOCKET_ETIMEDOUT:
$this->close();
throw new AMQPConnectionClosedException(socket_strerror($code), $code, $e);
default:
throw new AMQPIOException(sprintf(
'Error sending data. Last SocketError: %s',
socket_strerror($code)
), $code, $e);
}
} finally {
$this->restoreErrorHandler();
}
if ($result === false) {
throw new AMQPIOException(sprintf(
'Error sending data. Last SocketError: %s',
socket_strerror(socket_last_error($this->sock))
));
}
$now = microtime(true);
if ($result > 0) {
$this->last_write = $write_start = $now;
$written += $result;
} else {
if (($now - $write_start) > $this->write_timeout) {
throw AMQPTimeoutException::writeTimeout($this->write_timeout);
}
}
}
}
/**
* @inheritdoc
*/
public function close()
{
$this->disableHeartbeat();
if (is_resource($this->sock) || is_a($this->sock, \Socket::class)) {
socket_close($this->sock);
}
$this->sock = null;
$this->last_read = 0;
$this->last_write = 0;
}
/**
* @inheritdoc
*/
protected function do_select(?int $sec, int $usec)
{
if (!is_resource($this->sock) && !is_a($this->sock, \Socket::class)) {
$this->sock = null;
throw new AMQPConnectionClosedException('Broken pipe or closed connection', 0);
}
$read = array($this->sock);
$write = null;
$except = null;
return socket_select($read, $write, $except, $sec, $usec);
}
/**
* @return int|bool
*/
protected function select_write()
{
$read = $except = null;
$write = array($this->sock);
return socket_select($read, $write, $except, 0, 100000);
}
/**
* @throws \PhpAmqpLib\Exception\AMQPIOException
*/
protected function enable_keepalive()
{
if (!defined('SOL_SOCKET') || !defined('SO_KEEPALIVE')) {
throw new AMQPIOException('Can not enable keepalive: SOL_SOCKET or SO_KEEPALIVE is not defined');
}
socket_set_option($this->sock, SOL_SOCKET, SO_KEEPALIVE, 1);
}
/**
* @inheritdoc
*/
public function error_handler($errno, $errstr, $errfile, $errline, $errcontext = null)
{
$constants = SocketConstants::getInstance();
// socket_select warning that it has been interrupted by a signal - EINTR
if (isset($constants->SOCKET_EINTR) && false !== strrpos($errstr, socket_strerror($constants->SOCKET_EINTR))) {
// it's allowed while processing signals
return;
}
parent::error_handler($errno, $errstr, $errfile, $errline, $errcontext);
}
/**
* @inheritdoc
*/
protected function setErrorHandler(): void
{
parent::setErrorHandler();
socket_clear_error($this->sock);
}
}