php tcp udp 通信
/*** udp收发包
* @param $ip
* @param $port
* @param $timeout
* @return int 0-成功，非0-失败（具体参考类头部错误码常量定义）
*/
private function udpSocket($ip, $port, $timeout)
{
$time = microtime(true);
$sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
if (false === $sock) {
return self::UDL_SOCKET_CREATE_FAILED; // socket创建失败
}
if (!socket_set_nonblock($sock)) {
return self::UDL_SOCKET_SET_NONBLOCK_FAILED; // 设置socket非阻塞失败
}
$len = strlen($this->mUdlRequestBuf);
if (socket_sendto($sock, $this->mUdlRequestBuf, $len, 0x100, $ip, $port) != $len) {
return self::UDL_SOCKET_SEND_FAILED; // socket发送失败
}
if (0 == $timeout) {
return self::UDL_SUCCESS; // 无回包的情况，返回成功
}
$read = array($sock);
$second = floor($timeout);
$usecond = ($timeout - $second) * 1000000;
$ret = socket_select($read, $write, $except, $second, $usecond);
if (FALSE === $ret) {
return self::UDL_SOCKET_RECEIVE_FAILED; // 收包失败
} elseif ($ret != 1) {
return self::UDL_SOCKET_SELECT_TIMEOUT; // 收包超时
}
$out = null;
while (true) {
if (microtime(true) - $time > $timeout) {
return self::UDL_SOCKET_TIMEOUT; // 收包超时
}
// 32k：32768 = 1024 * 32
$outLen = @socket_recvfrom($sock, $out, 32768, 0, $host, $port);
if (!($outLen > 0 && $out != '')) {
continue;
}
$list = unpack('Nseq', substr($out, 9, 4));
$seq = $list['seq'];
if ($seq !== $this->mSeq) {
continue;
}
$this->mUdlResponseBuf = $out;
return self::UDL_SUCCESS;
}
}
/**
* udp收发包
* @param $ip
* @param $port
* @param $timeout
* @return int 0-成功，非0-失败（具体参考类头部错误码常量定义）
*/
private function tcpSocket($ip, $port, $timeout)
{
$time = microtime(true);
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (false === $sock) {
return self::UDL_SOCKET_CREATE_FAILED; // socket创建失败
}
if (!socket_connect($sock, $ip, $port)) {
return self::UDL_SOCKET_CONNECT_FAILED;
}
$len = strlen($this->mUdlRequestBuf);
if (socket_write($sock, $this->mUdlRequestBuf, $len) != $len) {
return self::UDL_SOCKET_SEND_FAILED;
}
$read = array($sock);
$ret = socket_select($read, $write = null, $except = null, $timeout);
if (false === $ret) {
return self::UDL_SOCKET_RECEIVE_FAILED;
} elseif ($ret != 1) {
return self::UDL_SOCKET_SELECT_TIMEOUT;
}
$totalLen = 0;
while (true) {
if (microtime(true) - $time > $timeout) {
return self::UDL_SOCKET_TIMEOUT; // 收包超时
}
//读取最多32M的数据
$data = socket_read($sock, self::SOCKET_TCP_MAX_PCK_SIZE, PHP_BINARY_READ);
if (empty($data)) {
// 已经断开连接
return self::UDL_SOCKET_CLOSED;
} else {
//第一个包
if ($this->mUdlResponseBuf === null) {
$this->mUdlResponseBuf = $data;
//在这里从第一个包中获取总包长
$list = unpack('Nlen', substr($data, 1, 4));
$totalLen = $list['len'];
} else {
$this->mUdlResponseBuf .= $data;
}
//check if all package is receved
if (strlen($this->mUdlResponseBuf) >= $totalLen) {
return self::UDL_SUCCESS;
}
}
}
}
/**
* 打包、收发包、解包
* @param $ip
* @param $port
* @param int $timeout
* @return int
*/
private function sendAndReceive($ip, $port, $timeout = 2, $socketMode)
{
try {
$this->serialize();
if ($socketMode === self::SOCKET_MODE_UDP) {
$r = $this->udpSocket($ip, $port, $timeout);
} else {
$r = $this->tcpSocket($ip, $port, $timeout);
}
if ($r !== self::UDL_SUCCESS) {
return $r;
}
$this->unserialize();
} catch (Exception $e) {
return self::UDL_FAILED;
}
return self::UDL_SUCCESS;
}
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