Phalcon7中怎么实现一个Websocket服务，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
直接上源码
<?php
class Websocket
{
static public $debug = false;
protected $port = null;
protected $host = null;
protected $server = null;
protected $callback = null;
protected static $opcodes = array(
'continuation' => 0,
'text' => 1,
'binary' => 2,
'close' => 8,
'ping' => 9,
'pong' => 10,
);
public function __construct($host, $port, $callback = NULL) {
$this->port = $port;
$this->host = $host;
$this->callback = $callback;
}
public function start()
{
try {
$this->server = \Phalcon\Async\Network\TcpServer::listen($this->host, $this->port);
self::info('start server listen:'.$this->host.':'.$this->port);
while (true) {
$socket = $this->server->accept();
if ($socket === false) {
continue;
}
$callback = $this->callback;
\Phalcon\Async\Task::async(function () use ($socket, $callback) {
$isClose = false;
$isHandshake = false;
$socket->is_closing = false;
$socket->fragment_status = 0;
$socket->fragment_length = 0;
$socket->fragment_size = 4096;
$socket->read_length = 0;
$socket->huge_payload = '';
$socket->payload = '';
$socket->headers = NULL;
$socket->request_path = NULL;
try {
$buffer = '';
while (!$socket->is_closing && null !== ($chunk = $socket->read())) {
$buffer .= $chunk;
if ($isHandshake === false) {
if (strpos($buffer, "\r\n\r\n")) {
if ($this->handShake($socket, $buffer)) {
$isHandshake = true;
$buffer = '';
}
}
continue;
}
if ($this->process($socket, $buffer)) {
$buffer = '';
if ($callback && \is_callable($callback)) {
$callback($socket, $socket->headers, $socket->request_path, $socket->payload);
}
$socket->fragment_status = 0;
$socket->fragment_length = 0;
$socket->read_length = 0;
$socket->huge_payload = '';
$socket->payload = '';
}
}
} catch (\Throwable $e) {
self::err($e->getMessage());
} finally {
$socket->close();
}
});
}
} catch (\Throwable $e) {
self::err($e->getMessage());
} finally {
if ($this->server) {
$this->server->close();
}
}
}
/**
* 请求握手
* @return boolean
*/
static public function handShake($socket, $buffer)
{
self::info('recv:'.$buffer);
if (($wsKeyIndex = stripos($buffer, 'Sec-WebSocket-Key:')) === false) {
throw new \Exception('Handshake failed, Sec-WebSocket-Key missing');
}
if (!preg_match('/GET (.*) HTTP\//mUi', $buffer, $matches)) {
throw new \Exception('Handshake failed, No GET in HEAD');
}
$uri = trim($matches[1]);
$uri_parts = parse_url($uri);;
$socket->headers = explode("\r\n", $buffer);
$socket->request_path = $uri_parts['path'];
$wsKey = substr($buffer, $wsKeyIndex + 18);
$key = trim(substr($wsKey, 0, strpos($wsKey, "\r\n")));
// 根据客户端传递过来的 key 生成 accept key
$acceptKey = base64_encode(sha1($key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true));
// 拼接回复字符串
$msg = "HTTP/1.1 101 Switching Protocols\r\n";
$msg .= "Upgrade: websocket\r\n";
$msg .= "Sec-WebSocket-Version: 13\r\n";
$msg .= "Connection: Upgrade\r\n";
$msg .= "Sec-WebSocket-Accept: " . $acceptKey . "\r\n\r\n";
$socket->write($msg);
return true;
}
static public function readFragment0($socket, $buffer) {
if (strlen($buffer) < 2) {
return false;
}
$data = substr($buffer, 0, 2);
$socket->read_length = 2;
// Is this the final fragment? // Bit 0 in byte 0
/// @todo Handle huge payloads with multiple fragments.
$socket->final = (boolean) (ord($data[0]) & 1 << 7);
// Should be unused, and must be false… // Bits 1, 2, & 3
$rsv1 = (boolean) (ord($data[0]) & 1 << 6);
$rsv2 = (boolean) (ord($data[0]) & 1 << 5);
$rsv3 = (boolean) (ord($data[0]) & 1 << 4);
// Parse opcode
$opcode_int = ord($data[0]) & 31; // Bits 4-7
$opcode_ints = array_flip(self::$opcodes);
if (!array_key_exists($opcode_int, $opcode_ints)) {
throw new \Exception('Bad opcode in websocket frame: '.$opcode_int);
}
$opcode = $opcode_ints[$opcode_int];
// record the opcode if we are not receiving a continutation fragment
if ($opcode !== 'continuation') {
$socket->last_opcode = $opcode;
}
// Masking?
$socket->mask = (boolean) (ord($data[1]) >> 7); // Bit 0 in byte 1
$socket->payload = '';
// Payload length
$socket->payload_length = (integer) ord($data[1]) & 127; // Bits 1-7 in byte 1
if ($socket->payload_length > 125) {
$socket->fragment_status = 1;
} else {
$socket->fragment_status = 2;
}
return true;
}
static public function readFragment1($socket, $buffer) {
if ($socket->payload_length === 126) {
if ($socket->fragment_length - $socket->read_length < 2) {
return false;
}
$data = substr($buffer, $socket->read_length, 2); // 126: Payload is a 16-bit unsigned int
$socket->read_length += 2;
} else {
if ($socket->fragment_length - $socket->read_length < 8) {
return false;
}
$data = substr($buffer, $socket->read_length, 8); // 127: Payload is a 64-bit unsigned int
$socket->read_length += 8;
}
$socket->payload_length = bindec(self::sprintB($data));
$socket->fragment_status = 2;
return true;
}
static public function readFragment2($socket, $buffer) {
// Get masking key.
if ($socket->mask) {
if ($socket->fragment_length - $socket->read_length < (4 + $socket->payload_length)) {
return false;
}
$masking_key = substr($buffer, $socket->read_length, 4);
$socket->read_length += 4;
} elseif ($socket->fragment_length - $socket->read_length < $socket->payload_length) {
return false;
}
// Get the actual payload, if any (might not be for e.g. close frames.
if ($socket->payload_length > 0) {
$data = substr($buffer, $socket->read_length, $socket->payload_length);
$socket->read_length += $socket->payload_length;
if ($socket->mask) {
// Unmask payload.
for ($i = 0; $i < $socket->payload_length; $i++) {
$socket->payload .= ($data[$i] ^ $masking_key[$i % 4]);
}
} else {
$socket->payload = $data;
}
}
$socket->fragment_status = 3;
return true;
}
static public function sendFragment($socket, $payload, $opcode = 'text', $masked = true) {
if (!in_array($opcode, array_keys(self::$opcodes))) {
throw new \Exception('Bad opcode '.$opcode.', try text or binary.');
}
// record the length of the payload
$payload_length = strlen($payload);
$fragment_cursor = 0;
// while we have data to send
while ($payload_length > $fragment_cursor) {
// get a fragment of the payload
$sub_payload = substr($payload, $fragment_cursor, $socket->fragment_size);
// advance the cursor
$fragment_cursor += $socket->fragment_size;
// is this the final fragment to send?
$final = $payload_length <= $fragment_cursor;
// send the fragment
self::send_frame($socket, $final, $sub_payload, $opcode, $masked);
// all fragments after the first will be marked a continuation
$opcode = 'continuation';
}
}
static public function send_frame($socket, $final, $payload, $opcode, $masked) {
// Binary string for header.
$frame_head_binstr = '';
// Write FIN, final fragment bit.
$frame_head_binstr .= (bool) $final ? '1' : '0';
// RSV 1, 2, & 3 false and unused.
$frame_head_binstr .= '000';
// Opcode rest of the byte.
$frame_head_binstr .= sprintf('%04b', self::$opcodes[$opcode]);
// Use masking?
$frame_head_binstr .= $masked ? '1' : '0';
// 7 bits of payload length...
$payload_length = strlen($payload);
if ($payload_length > 65535) {
$frame_head_binstr .= decbin(127);
$frame_head_binstr .= sprintf('%064b', $payload_length);
}
elseif ($payload_length > 125) {
$frame_head_binstr .= decbin(126);
$frame_head_binstr .= sprintf('%016b', $payload_length);
}
else {
$frame_head_binstr .= sprintf('%07b', $payload_length);
}
$frame = '';
// Write frame head to frame.
foreach (str_split($frame_head_binstr, 8) as $binstr) $frame .= chr(bindec($binstr));
// Handle masking
if ($masked) {
// generate a random mask:
$mask = '';
for ($i = 0; $i < 4; $i++) $mask .= chr(rand(0, 255));
$frame .= $mask;
}
// Append payload to frame:
for ($i = 0; $i < $payload_length; $i++) {
$frame .= ($masked === true) ? $payload[$i] ^ $mask[$i % 4] : $payload[$i];
}
$socket->write($frame);
}
/**
* Helper to convert a binary to a string of '0' and '1'.
*/
protected static function sprintB($string) {
$ret = '';
for ($i = 0; $i < strlen($string); $i++) {
$ret .= sprintf("%08b", ord($string[$i]));
}
return $ret;
}
/**
* 解析数据包
*
* @return string
*/
static public function process($socket, $buffer)
{
startfragment:
self::info('process fragment_status:'.$socket->fragment_status.' buffer length:'.strlen($buffer));
$socket->fragment_length = strlen($buffer);
switch ($socket->fragment_status) {
case 0:
// Just read the main fragment information first.
if (!self::readFragment0($socket, $buffer)) {
return false;
}
goto startfragment;
break;
case 1:
if (!self::readFragment1($socket, $buffer)) {
return false;
}
goto startfragment;
break;
case 2:
if (!self::readFragment2($socket, $buffer)) {
return false;
}
goto startfragment;
break;
case 3:
{
if ($socket->last_opcode === 'close') {
// Get the close status.
if ($socket->payload_length >= 2) {
$status_bin = $socket->payload[0] . $socket->payload[1];
$status = bindec(sprintf("%08b%08b", ord($socket->payload[0]), ord($socket->payload[1])));
$socket->close_status = $status;
$socket->payload = substr($socket->payload, 2);
self::sendFragment($socket, $status_bin . 'Close acknowledged: ' . $status, 'close', true); // Respond.
}
$socket->is_closing = true; // A close response, all done.
}
// if this is not the last fragment, then we need to save the payload
if (!$socket->final) {
$socket->huge_payload .= $socket->payload;
self::info('final:'.$socket->final.', payload:'.$socket->payload);
return false;
} else {
// sp we need to retreive the whole payload
$socket->huge_payload .= $socket->payload;
$socket->payload = $socket->huge_payload;
$socket->huge_payload = null;
self::info('final:'.$socket->final.', payload:'.$socket->payload);
return true;
}
break;
}
}
return false;
}
static public function info($message)
{
if (self::$debug) {
echo Phalcon\Cli\Color::info($message).PHP_EOL;
}
}
static public function err($message)
{
echo Phalcon\Cli\Color::error($message).PHP_EOL;
}
}
/**
* 客户端测试
* sudo apt install node-ws
* wscat -c ws://localhost:10001
*/
// Websocket::$debug = true;
$ws = new Websocket('0.0.0.0', 10001, function($socket, $headers, $path, $data) {
var_dump($data);
Websocket::sendFragment($socket, 'Re: '.$data);
});
$ws->start();看完上述内容，你们掌握Phalcon7中怎么实现一个Websocket服务的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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