Detecting if React PHP client cannot connect to server

Question

How can it be detected that a React PHP client cannot connect with a server? I was hoping for the fictional else() method that I showed at the bottom. Do I just need to wait a reasonable amount of time, and if no on data event occurs, it isn't connected.

<?php

require 'vendor/autoload.php';

$loop = React\EventLoop\Factory::create();

$dnsResolverFactory = new React\Dns\Resolver\Factory();
$dns = $dnsResolverFactory->createCached('8.8.8.8', $loop);
$connector = new React\SocketClient\Connector($loop, $dns);

$connector->create('127.0.0.1', 1337)->then(function (React\Stream\Stream $stream) {
    $buffer = '';
    $stream->on('data', function ($data, $stream) use (&$buffer) {
    });
})
/*
->else(function () {
    //no connection?
});
*/

$loop->run();

score 1 · Accepted Answer · answered May 14 '17 at 20:58

1

Have a look at ReactPHP's PromiseInterface. Either use a second callback for then or use otherwise, which is exactly your artificial else.

$connector->create('127.0.0.1', 1337)->then(function (React\Stream\Stream $stream) {
    $buffer = '';
    $stream->on('data', function ($data, $stream) use (&$buffer) {
        // ...
    });
}, function (Throwable $error) {
    // handle error here
});

answered May 14 '17 at 20:58

kelunik

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Perfect! Also, thanks for pointing me to the `PromiseInterface`. – user1032531 May 14 '17 at 22:46

score 0 · Answer 2 · answered May 13 '17 at 22:48

<?php

require 'vendor/autoload.php';

$loop = React\EventLoop\Factory::create();

$dnsResolverFactory = new React\Dns\Resolver\Factory();
$dns = $dnsResolverFactory->createCached('8.8.8.8', $loop);
$connector = new React\SocketClient\Connector($loop, $dns);

$gotConnected=false;

$connector->create('127.0.0.1', 1337)->then(function (React\Stream\Stream $stream) use(&$gotConnected) {
    $gotConnected=true;
    $buffer = '';
    $stream->on('data', function ($data, $stream) use (&$buffer) {
    });
});

$loop->run();

echo($gotConnected?'Got connected':'Did not get connected');

While this works for a single socket, there's a better way to handle errors, [see my answer](http://stackoverflow.com/a/43968729/2373138). — kelunik, May 14 '17 at 21:00

Detecting if React PHP client cannot connect to server

2 Answers2