Discussion:
Some questions (maybe stupid) on websockets
(too old to reply)
Alex Povolotsky
2018-09-25 06:29:59 UTC
Permalink
Hello!

I need a bit of help on websockets.

I'm writing an app which should open several websocket connections with
similar handling. With one websocket it worked perfectly, but with two I've
run into problems.

It look like when one connection is being reset by server, my restart
mechanism sometimes fails.

I'm using one UserAgent for both connections (is it right?) and I've
implemented reconnect as

$tx->on( finish => sub {
my $tx = shift;
$log->info('Websocket (klines) closed '. (
$tx->res->message//join(':',@_)));
print 'Websocket (klines) closed '.
join(':',@_),"\n";
Mojo::IOLoop->timer( 3 => sub {
$log->info('Restarting
after 3 seconds');

app->events->emit('klines_connect', $url);
} );
} );

where klines_connect performs websocket connection.

For some reason, I'm getting several finish events in a row (according to
my log at least) and no restart pause. After several attempts, everything
hangs until Ctrl-C.

I cannot reliable reproduce the problem, it just happens after several
hours.

Assuming I have several websocket connection with common error and finish
event handlers and just different json one, can someone please show me good
impelmentation on writing well-reusable code for making handlers?

Alex.
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