NAME

Plack::App::WebSocket::Connection - WebSocket connection for Plack::App::WebSocket

SYNOPSIS

my $app = Plack::App::WebSocket->new(on_establish => sub {
    my $connection = shift;
    $connection->on(message => sub {
        my ($connection, $message) = @_;
        warn "Received: $message\n";
        if($message eq "quit") {
            $connection->close();
        }
    });
    $connection->on(finish => sub {
        warn "Closed\n";
        undef $connection;
    });
    $connection->send("Message to the client");
});

DESCRIPTION

Plack::App::WebSocket::Connection is an object representing a WebSocket connection to a client. It is created by Plack::App::WebSocket internally and given to you in on_establish callback function.

OBJECT METHODS

@unregister = $connection->on($event => $handler, $event2 => $handler2, ...)

Register a callback function to a particular event. You can register multiple callbacks to the same event. You can register multiple callbacks by a single call to on method.

$event is a string and $handler is a subroutine reference.

Possible value for $event is:

"message"

$handler->($connection, $message, $unregister)

$handler is called for each message received via the $connection. Argument $connection is the Plack::App::WebSocket::Connection object, and $message is a non-decoded byte string of the received message.

$unregister is a subroutine reference. When you invoke it, it removes the handler from the $connection, so that it'll be never called again. See below for an example.

"finish" (alias: "close")

$handler->($connection)

$handler is called when the $connection is closed. Argument $connection is the Plack::App::WebSocket::Connection object.

on method returns list of subroutine references that unregister the $handlers just registered.

In scalar context, it returns the first subroutine reference.

Example of unregistering:

my $unregister;
$unregister = $connection->on( message => sub {
    my( $conn, $message ) = @_;
    $conn->send( "This will only be sent once" );
    $unregister->();
});

# could also be written as
$connection->on( message => sub {
    my( $conn, $message, $unregister ) = @_;
    $conn->send( "This will only be sent once" );
    $unregister->();
});

$connection->send($message)

Send a message via $connection.

$message should be a UTF-8 encoded string.

$connection->close()

Close the WebSocket $connection.

AUTHOR

Toshio Ito, <toshioito at cpan.org>