php get refused port

[thehatami]

after fresh installation and test, i try to send msg to channel from php. here is my code

$pub = new GripPubControl(array(
            'control_uri' => 'http://localhost:7779'
        ));

        $pub->publish_http_stream('ws', 'hello there\n');

but i got this error even open port in firewall.

Failed to publish: Failed to connect to localhost port 7779: Connection refused

whats wrong?

[jkarneges]

By default, Pushpin’s control port is 5561, so double check you’re specifying the correct port.

[thehatami]

thx jkarneges. but when i use this port on my client side i get

Can’t establish a connection to the server at ws://localhost:5561/ws.

why?

[jkarneges]

Clients connect to a front port (7999 by default) not the control port.

The reason for multiple ports is because the control port is private, to be used from the server side only.

[thehatami]

sorry. but how connect backend(php) to frontend(js)? my code not work. why?

frontend

var ws = new WebSocket('ws://localhost:7999/ws');
ws.onmessage = function (message) {
            console.log(message.data);
};

backend

$pub = new GripPubControl(array(
            'control_uri' => 'http://localhost:5561'
));

$pub->publish_http_stream('ws', 'hello there\n');

[jkarneges]

Where is /ws routing to? If it's the test handler, you need to publish to channel test. If it's routing to your backend server, then your server needs to send a subscription control message.

[jkarneges]

Also, publish_http_stream publishes data only to clients that are using the HTTP streaming transport.

To publish to clients that are connected with the WebSocket transport, you need to publish a websocket message like this:

$pub->publish('test', new PubControl\Item(
    new GripControl\WebSocketMessageFormat('hello there')
));

[thehatami]

thx. you help is very helpful. i think documents need more clear specially in php+js programming. and the last question is how can create new channel name. any channel except 'ws' with 'test' publish not work. i read route route section but cant find my answer.

[jkarneges]

See https://pushpin.org/docs/usage/#websockets . There's a PHP example.

[thehatami]

thx but im confused. to create new channel i used below code

<?php
// composer require fanout/gripcontrol

$in_events = GripControl::decode_websocket_events(
    file_get_contents("php://input"));
$out_events = array();
if ($in_events[0]->type == 'OPEN')
{
    $out_events[] = new WebSocketEvent('OPEN');
    $out_events[] = new WebSocketEvent('TEXT', 'c:' .
        GripControl::websocket_control_message('subscribe',
        array('channel' => 'mychannel')));
}

header('Content-Type: application/websocket-events');
header('Sec-WebSocket-Extensions: grip');
http_response_code(200);

echo GripControl::encode_websocket_events($out_events);

?>

but i get Notice: Undefined offset: 0

how can i create new channel and how assign handler to it?

[jkarneges]

I'm guessing that error is coming from $in_events[0] ? This script is meant to be invoked by Pushpin, in which case events will be provided and the code should be ok.

Try making a request directly to your php script using curl. You should see something like this:

$ curl -i -d 'OPEN'$'\r'$'\n' http://localhost:8000/yourphpfile.php
HTTP/1.1 200 OK
Date: Sat, 15 Jun 2019 22:23:31 GMT
Server: Apache/2.4.29 (Ubuntu)
Sec-WebSocket-Extensions: grip
Content-Length: 61
Content-Type: application/websocket-events

OPEN
TEXT 2c
c:{"channel":"mychannel","type":"subscribe"}

If you don't see that, then something is wrong with the script. But if you do see that, and you have Pushpin configured to route to your backend server, then making a WebSocket request through Pushpin (e.g. to ws://localhost:7999/yourphpfile.php) should work.