WebSocket: $this->socket->recv(); on client-side ends up with warning and websocket connection auto disconnects.

[fakharksa]

Please answer these questions before submitting your issue.

1. What did you do? If possible, provide a simple script for reproducing the error.

I have found that there comes an issue in your client-side recv() function of socket object ...

$this->socket->recv();

When server-side pushes all the messages, the function recv() returns not only "false" but it also issues a warning as below:

PHP Warning: Swoole\Client::recv(): recv() failed, Error: Resource temporarily unavailable[11] in /var/www/html/swoole-prac/websocketclient/wbsocketclient.php on line 87"

Side Note: And, it also gives a warning that there is no property $errMsg on socket object.

And, finally the connection between the server and client is disconnected (causing function onClose() to

Reference to Client-side Code:
Please, see on line 85 of this gist which i am using now.

My server-side code snippet is below:

        $this->server->on('Message', function($webSocketServer, Frame $frame) {
            if ($frame === '') {
                $webSocketServer->close();
            } else if ($frame === false) {
                echo 'errorCode: ' . swoole_last_error() . "\n";
                $webSocketServer->close();
            } else if ($frame->data == 'close' || get_class($frame) === CloseFrame::class || $frame->opcode == 0x08) {
                echo "Close frame received: Code {$frame->code} Reason {$frame->reason}\n";
            } else {
                $i=0;
                while (!$frame->finish) {
                    if ($i > 4000) {
                        $server->disconnect($frame->fd, SWOOLE_WEBSOCKET_CLOSE_NORMAL, "Frame Finish Time Exceeded.");
                    } else {
                        $i++;
                        echo "Frame is not Finished".PHP_EOL;
                        continue;
                    }
                }

                include_once __DIR__ . '/Controllers/WebSocketController.php';
                $sw_websocket_controller = new WebSocketController($webSocketServer, $frame, $this->dbConnectionPools);

                $response = $sw_websocket_controller->handle();

                $webSocketServer->push($frame->fd,
                    json_encode($response),
                    WEBSOCKET_OPCODE_TEXT,
                    SWOOLE_WEBSOCKET_FLAG_FIN); // OpenSwoole\WebSocket\Server::WEBSOCKET_FLAG_FIN
            }
        });

        $this->server->on('Close', function($server, $fd, $reactorId) {
            echo "client {$fd} closed\n ReactorId:{$reactorId}";
        });

My consumer-code of WebSocket-Client-side is as below:

include 'wbsocketclient.php'; // this is name of the websocket client file, as in provided gist above.
$w = new WebSocketClient('127.0.0.1', 9501);
if ($x = $w->connect()) {
    var_dump($x);
    for ($i=1;$i<4;$i++)
        $w->send('test'.$i, 'text', 1);
    $w->send('end', 'text', 1);
    while($data = $w->recv()) {
        var_export($data);
    }
} else {
    echo "Could not connect to server".PHP_EOL;
}

2. What did you expect to see?

When server-side pushes all the messages, the client connection should not dicsonnect.

3. What did you see instead?

After all pushes are done from server-side, on client-side (function $this->socket->recv() ) issues a Warning with error-code 11, in addition to return value "false" and connection is closed. (Reactor Id, as echoed in function onClose() on server-side, is shown as 2)

Warning is as below:

PHP Warning: Swoole\Client::recv(): recv() failed, Error: Resource temporarily unavailable[11] in /var/www/html/swoole-prac/websocketclient/wbsocketclient.php on line 87"

And, it also gives a warning that there is no property $errMsg on socket object, as gist uses this property on socket object.

4. What version of Swoole are you using (show your php --ri swoole)?

swoole

Swoole => enabled
Author => Swoole Team [email protected]
Version => 5.1.2
Built => May 26 2024 22:51:27
coroutine => enabled with thread context
debug => enabled
trace_log => enabled
epoll => enabled
eventfd => enabled
signalfd => enabled
cpu_affinity => enabled
spinlock => enabled
rwlock => enabled
sockets => enabled
openssl => OpenSSL 3.0.2 15 Mar 2022
dtls => enabled
http2 => enabled
json => enabled
curl-native => enabled
c-ares => 1.18.1
zlib => 1.2.11
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
mysqlnd => enabled
async_redis => enabled
coroutine_pgsql => enabled

Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_fiber_mock => Off => Off
swoole.enable_preemptive_scheduler => On => On
swoole.display_errors => On => On
swoole.use_shortname => On => On
swoole.unixsock_buffer_size => 8388608 => 8388608

5. What is your machine environment used (show your uname -a & php -v & gcc -v) ?

Linux HP-Laptop 5.17.5-76051705-generic #202204271406165150484020.04~63e51bd-Ubuntu SMP PREEMPT Wed Ma x86_64 x86_64 x86_64 GNU/Linux

PHP 8.3.8 (cli) (built: Jun 6 2024 16:58:27) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.8, Copyright (c) Zend Technologies
with Zend OPcache v8.3.8, Copyright (c), by Zend Technologies

COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu122.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu122.04)

[yoyoyeahyoyo]

version 6.0.0-2 is not working with pdo_pgsql giving that same error: "Error: Resource temporarily unavailable".

[matyhtf]

PHP Warning:  Swoole\Client::recv(): recv() failed, Error: Resource temporarily unavailable[11] in /var/www/html/swoole-prac/websocketclient/wbsocketclient.php on line 87

Swoole\Client::recv() returned false with an errCode of EAGAIN indicates a receive timeout, not a closed connection. The server sends four times, and there should be four corresponding receives, not a looped receive.

If you want the client to never time out until the server sends a message, set the third parameter of Swoole\Client::connect() to -1. This way, it won't return false and the EAGAIN error.