My goal is capture messages being generated in real time by a Java server socket and display these messages on the webpage.
I am trying to use php to connect to the socket and receive data from the server. The php client should continuously listen to the server for messages.
Here is my php code
<?php
set_time_limit(0);
$serverAddress=SERVER_ADDRESS;
$serverListeningPort=SERVER_PORT;
//make a connection and get a socket object
if ( ($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === FALSE )
{
echo "socket_create() failed: reason: " .socket_strerror(socket_last_error());
}
else
{
echo("socket create was successful");
echo("<br>");
}
echo ("Attempting to connect to host");
echo("<br>");
if ( ($result = socket_connect($socket, $serverAddress, $serverListeningPort)) === FALSE )
{
echo ("socket_connect() failed. Reason:".socket_strerror(socket_last_error($socket)));
}
echo ("Reading response:");
$message="";
while(true)//listen for ever
{
$message=socket_read($socket, 300);
if($message!=='')
{
print_r($message);
}
}
?>
When I load this php page, most of the time I get a 504 gateway time out error. I have verified that the Java server is picking up the client connection.
Sometimes, I get a few messages only and then the page stops getting messages from the server. Not sure why, as I have a while(true) loop.
Am I using the php socket correctly? How can I accomplish my goal.
Thank you
Try adding the below lines at the start of your code. This will output the result to browser as it is generated.
ob_end_flush();
ob_implicit_flush(1);
Related
i've seen other people with this problem, but maybe i can explain my situation and you can point out where the issue might be.
im getting a 'Warning : socket_bind(): unable to bind address [98]: Address already in use' error.
the situation is this. I am using a web application to trigger another program to perform tasks (from a webpage interface). The results of that program are sent through a socket to my web application that is listening on a socket.
first i create and open the socket, then i trigger the other program, then when that program is finished it should send its results back through the socket.
it works fine the first try. Then the next try (i trigger this process many times) i get the above socket bind error when trying to open the socket, obviously the socket is still bound.
i wait about a minute and i can successfully run the process again. I think the socket connection timesout.
I dont know if the problem is because of the way i have structure my socket code, or if the problem is in the external program that i am triggering. I dont know much about the internals of the external program as its a jar file built by someone else.
heres the code i use for creating and handling the socket. I just used an example on php.net and altered it for my needs.
$port1 = 15000;
// configure the socket
error_reporting(E_ALL);
set_time_limit(0);
ob_implicit_flush();
$address = '127.0.0.1';
$port2 = 54321;
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$error = 'none';
if ($sock) {
if (socket_bind($sock, $address, $port2)) {
if (socket_listen($sock, 5)) {
// trigger external process
if (start_calibration()) {
$buf = array();
// listen to the socket for incoming messages
do {
// if incomming connection is not accepted break out and close socket
if (($msgsock = socket_accept($sock)) === false) {
break;
}
do {
// if cant read socket then break out and close socket
if (false === ($buf = socket_read($msgsock, 2048, PHP_BINARY_READ))) {
break 2;
}
$buf = unpack('C*', $buf);
socket_close($msgsock);
break 2;
} while (true);
socket_close($msgsock);
} while (true);
socket_close($sock);
// code to handle data recieved through the socket
}
else {
// start_calibration failed
$error = 'start_calibration failed';
socket_close($sock);
}
}
else {
// socket_listen failed
$error = 'socket_listen failed';
socket_close($sock);
}
}
else {
// socket_bind failed
$error = 'socket_bind failed';
socket_close($sock);
}
}
else {
// socket_create failed
$error = 'socket_create failed';
}
$data['error'] = $error;
echo json_encode($data);
also, is there is a more efficient way to handle the closing of sockets if there is problems with lines like 'socket_bind', 'socket_listen' etc?
Did you try to set the flag SO_REUSEADDR on your socket?
There's a sample in the socket_set_option's documentation.
I'm coding a php socket server script which is running on ubuntu.
It works well, clients can connect/disconnect to this server.
But the server is shutting down silently when a client connect to this server that didn't have any client connected for a long time.
I setted up timeout to 0 (unlimited) but the server is stoping without any errors or messages... like this.
root#exfl:/home/projectap/sec/server_core# php socket_server.php
[exfl.kr] Starting AbsolutePitch socket server...
[2014.06.21 16:50:58] Server is listening. PID: 6442
[2014.06.21 17:28:48] Client [192.168.0.1:8795] connected to the server.
root#exfl:/home/projectap/sec/server_core#
I coded for this server like this.
<?php
set_time_limit(0);
error_reporting(E_ALL);
ini_set("memory_limit","2048M");
ini_set("max_execution_time", "0");
if(posix_getpid() == true) {
echo "[exfl.kr] Starting AbsolutePitch socket server...\n";
} else {
echo getTimeToStr()."Server is already running.\n";
}
$cSock = array();
$socketsInformation = array();
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$bind = socket_bind($socket, "0.0.0.0", "24180");
$listen = socket_listen($socket, 5);
echo getTimeToStr()."Server is listening. PID: ".posix_getpid()."\n";
while(true) {
$sockArr = array_merge(array($socket), $cSock);
if(socket_select($sockArr, $tWrite = null, $tExcept = null, null) > 0) {
foreach($sockArr as $sock){
if($sock == $socket){
$tSock = socket_accept($socket);
socket_getpeername($tSock, $sockIp, $sockPort);
array_push($cSock, $tSock);
array_push($socketsInformation, array("SOCKETINDEX"=>(count($cSock)-1), "IP"=>$sockIp, "USERID"=>"", "STATUS"=>"", "AUTH"=>false));
echo getTimeToStr()."Client [".$sockIp.":".$sockPort."] connected to the server.\n";
} else {
...
}
}
}
}
echo getTimeToStr()."Server closed.\n";
...
?>
When the server stops suddenly, it isn't outputing a "Server closed" message..
Please help.
Sorry for my bad English.
You may want to try socket_set_options() with SO_KEEPALIVE. To know more about your options use the socket_get_options page:
https://www.php.net/manual/en/function.socket-get-option.php
To know more about the usage of socket_set_options() use:
https://www.php.net/manual/en/function.socket-set-option.php
I am using the following php code to connect and send a request to a remote server through php sockets connection.
<?php
$host = "X.X.X.X";
$port = 1234;
$message = "<request>test</request>";
echo "Message To server :".$message;
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// connect to server
$result = socket_connect($socket, $host, $port) or die("Could not connect to server\n");
// send string to server
socket_write($socket, $message, strlen($message)) or die("Could not send data to server\n");
// get server response
stream_set_timeout($socket, 10);
$result = socket_read ($socket, 1024) or die("Could not read server response\n");
//echo "Reply From Server :".$result;
$info = stream_get_meta_data($socket);
if (isset($info['timed_out']) && $info['timed_out'])
{
echo 'Connection timed out!';
}
else
{
var_dump($result);
}
// close socket
socket_close($socket);
?>
As confirmed, the remote machine is receiving our request and sending appropriate response to us over the same session. But unfortunately, I am getting the following response when the script is executed -
504 Gateway Time-out. The server didn't respond in time.
When tried from Putty (same server from where the code was executed), I am getting the response almost instantly (in less than a second).
There is no firewall running that would block the responses. All VPN traffic passes through the tunnel without any blocks as seen in telnet request and response.
Now I am unable to figure out the exact reason of not getting the response through this php script. I had gone through many tutorials and sample codes but found no luck. :(
Members, please help.
I've worked with php socket that simulates a telnet session without setting a timeout parameter. Try the below and let me know how it well it goes
<?php
// You can use socket_strerror(socket_last_error()) to get the error details
$socket = socket_create(AF_INET,SOCK_STREAM,0) or die ('Could not create socket') ;
$result = socket_connect($socket,$host,$port) or die ('Could not connect to host');
// The server expects the enter key to pressed to execute the command which i simulate by
// appending a \n to the message sent to the server
socket_send($socket,$message,strlen($message),0) or die('Could not execute command');
$result = socket_read($socket,2048) or die('Could not read from socket');
var_dump($result);
This might be outdated, but a note on The PHP manual says:
In case anyone is puzzled, stream_set_timeout DOES NOT work for sockets created with socket_create or socket_accept. Use socket_set_option instead.
Instead of:
<?php
stream_set_timeout($socket,$sec,$usec);
?>
Use:
<?php
socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec'=>$sec, 'usec'=>$usec));
socket_set_option($socket, SOL_SOCKET, SO_SNDTIMEO, array('sec'=>$sec, 'usec'=>$usec));
?>
Try setting the read mode in socket_read to PHP_NORMAL_READ
So I've been able to use AJAX to repeatedly refresh a div on my website, using the following code:
var $container = $("#content");
var refreshId = setInterval(function()
{
$container.load('toad.php').fadeOut("slow").load('response.php').fadeIn("slow"); ;
}, 2000);
This works fine, toad.php gets executed every 2 seconds and the contents update.
toad.php contains the following code currently:
<?php
if ( !($sock = socket_create(AF_INET, SOCK_STREAM, 0)) ) {
$errorcode = socket_last_error();
$errormsg = socket_strerror($errorcode);
die("Couldn't create socket: [$errorcode] $errormsg \n");
}
echo "Socket created \n";
if (!socket_connect($sock, '127.0.0.1', 45000)) {
//$errorcode = socket_last_error();
//$errormsg = socket_strerror($errorcode);
echo "No sensor available to connect to.\n";
//die("Could not connect: [$errorcode] $errormsg \n");
}
echo "Connection established \n";
//Now receive reply from server
if (false !== ($bytes = socket_recv($sock, $buf, 1200, MSG_WAITALL))) {
echo "Read $bytes bytes from socket_recv(). Closing socket...";
}
else {
echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
socket_close($sock);
echo $buf . "\n";
echo "OK.\n";
?>
The issue with this is that the socket is created and connected to every single time the div is refreshed.
If I don't have the socket_create and socket_connect functions in toad.php then the socket_recv function doesn't know about the socket and doesn't work.
My question is how can I get the socket receive code to loop and update the contents of the div without having to re create and connect to the socket every time?
Thanks!
If you can rewrite the server your connecting to to use websocket, you could just connect directly from the browser using socket.io.
http://socket.io/
As others have said, maintaining a persistent PHP connection can be tricky, but if running a NodeJS (or similar) script to handle client connections isn't possible you could serve the websockets from that same PHP script.
Try this approach:
http://devzone.zend.com/209/writing-socket-servers-in-php/
Your toad.php script would run on the command line, listening to your existing socket server, then serving the data to it's own socket server which the browser connects to directly with websocket.
I created a PHP Socket Server with PHP_NORMAL_READ mode. So, a message to the server is read when it ends with \n or \r. I tried it by connecting to the server with multiple telnet instances, and it works great.
However, when I connect to the server with 1 flash application and 1 telnet application (I first start the flash one), the flash one seems to make the server hang - the server is getting stuck somewhere and no longer receiving data from eg. the telnet client.
Because anyone can code a flash client, this has to be fixed server side. The server's code:
<?php
// config
$timelimit = 60; // amount of seconds the server should run for, 0 = run indefintely
$port = 9000; // the port to listen on
$address = $_SERVER['SERVER_ADDR']; // the server's external IP
$backlog = SOMAXCONN; // the maximum of backlog incoming connections that will be queued for processing
// configure custom PHP settings
error_reporting(1); // report all errors
ini_set('display_errors', 1); // display all errors
set_time_limit($timelimit); // timeout after x seconds
ob_implicit_flush(); // results in a flush operation after every output call
//create master IPv4 based TCP socket
if (!($master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) die("Could not create master socket, error: ".socket_strerror(socket_last_error()));
// set socket options (local addresses can be reused)
if (!socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1)) die("Could not set socket options, error: ".socket_strerror(socket_last_error()));
// bind to socket server
if (!socket_bind($master, $address, $port)) die("Could not bind to socket server, error: ".socket_strerror(socket_last_error()));
// start listening
if (!socket_listen($master, $backlog)) die("Could not start listening to socket, error: ".socket_strerror(socket_last_error()));
//display startup information
echo "[".date('Y-m-d H:i:s')."] SERVER CREATED (MAXCONN: ".SOMAXCONN.").\n"; //max connections is a kernel variable and can be adjusted with sysctl
echo "[".date('Y-m-d H:i:s')."] Listening on ".$address.":".$port.".\n";
$time = time(); //set startup timestamp
// init read sockets array
$read_sockets = array($master);
// continuously handle incoming socket messages, or close if time limit has been reached
while ((!$timelimit) or (time() - $time < $timelimit)) {
$changed_sockets = $read_sockets;
socket_select($changed_sockets, $write = null, $except = null, null);
foreach($changed_sockets as $socket) {
if ($socket == $master) {
if (($client = socket_accept($master)) < 0) {
continue;
} else {
array_push($read_sockets, $client);
}
} else {
$data = #socket_read($socket, 1024, PHP_NORMAL_READ); //read a maximum of 1024 bytes until a new line has been sent
if ($data === false) { //the client disconnected
$index = array_search($socket, $read_sockets);
unset($read_sockets[$index]);
socket_close($socket);
} elseif ($data = trim($data)) { //remove whitespace and continue only if the message is not empty
echo "we received: ".$data."\n\n";
//handleData($data, $socket);
}
}
}
}
socket_close($master); //close the socket
echo "[".date('Y-m-d H:i:s')."] SERVER CLOSED.\n";
//function to write to the flash client
function flash_write($socket, $msg) {
socket_write($socket, $msg.chr(0x0));
}
?>
Does anyone know what may cause this? I tried changing the timeout on the socket_select from none to 0 (instant return), but that didn't seem to change anything.
Could you post the source of the flash client? That would show what the problem is?
Are you sure the last thing you send from the flash client is a \n ?
Otherwise the server would block on socket_read() as the flash client socket can be read without blocking (triggered socket_select()), but doesn't send the ending \n.
One thing to help you debug: error_reporting(1) does not enable the display of all errors. Look at the documentation at http://us3.php.net/manual/en/function.error-reporting.php. You need something like error_reporting(E_ALL).