++ed by:
DMOL

1 PAUSE user

Anton Petrusevich
and 1 contributors

NAME

PEF::Front::WebSocket - WebSocket framework for PEF::Front

SYNOPSIS

    # startup.pl
    use PEF::Front::Websocket;
    # usual startup stuff...

    # $PROJECT_DIR/app/WSTest/WebSocket/Echo.pm
    package WSTest::WebSocket::Echo;
    
    sub on_message {
        my ($self, $message) = @_;
        $self->send($message); 
    }

    1;

DESCRIPTION

This module makes WebSockets really easy. Every kind of WebSocket is in its own module. Default routing scheme is /ws$WebSocketClass. WebSocket handlers are located in $PROJECT_DIR/app/$MyAPP/WebSocket.

Prerequisites

This module requires Coro, AnyEvent and PSGI server that must meet the following requirements.

  • psgi.streaming environment is true.

  • psgi.nonblocking environment is true.

  • psgix.io environment holds a valid raw IO socket object. See PSGI::Extensions.

uwsgi version 2.0.14+ meets all of them with psgi-enable-psgix-io = true.

WEBSOCKET INTERFACE METHODS

on_message($message, $type)

A subroutine that is called on new message from client.

on_drain()

A subroutine that is called when there's nothing to send to client after some successful send.

on_open()

A subroutine that is called each time it establishes a new WebSocket connection to a client.

on_error($message)

A subroutine that is called when some error happens while processing a request.

on_close()

A subroutine that is called on WebSocket close event.

no_compression()

When defined and true then no compression will be used even when it supported by browser and server.

INHERITED METHODS

Every WebSocket class is derived from PEF::Front::Websocket::Base which is derived from PEF::Front::Websocket::Interface. Even when you don't derive your class from PEF::Front::Websocket::Base explicitly, this class will be added automatically to hierarchy.

send($buffer[, $type])

Sends $buffer to client. By default $type is 'text'.

close()

Closes WebSocket.

is_defunct()

Returns true when socket is closed or there's some error on it.

CONFIGURATION

cfg_websocket_heartbeat_interval

WebSocket connection has to be ping-ed to stay alive. This paramters specifies a positive number of seconds for ping interval. Default is 30.

cfg_websocket_max_payload_size

Maximum payload size for incoming messages in bytes. Default is 262144.

cfg_websocket_deflate_minimum_size

Minimum message size for deflate compression. If message size is less than this value then it will not be compressed. Default is 96.

cfg_websocket_deflate_window_bits

WindowBits parameter for deflate compression. Default is 12.

cfg_websocket_deflate_memory_level

MemLevel parameter for deflate compression. Default is 5.

EXAMPLE

  #startup.pl
  use WSTest::AppFrontConfig;
  use PEF::Front::Config;
  use PEF::Front::WebSocket;
  use PEF::Front::Route;

  PEF::Front::Route::add_route(
    get '/' => '/appWs',
  );
  PEF::Front::Route->to_app();
  
  
  # $PROJECT_DIR/app/WSTest/WebSocket/Echo.pm
  package WSTest::WebSocket::Echo;
 
  sub on_message {
      my ($self, $message) = @_;
      $self->send($message); 
  }

  1;
  
  # $PROJECT_DIR/templates/ws.html
  <html>
  <head>
  <script language="Javascript">
    var s = new WebSocket("ws://[% hostname %]:[% request.port %]/wsEcho");
    s.onopen = function() {
        alert("connected !!!");
        s.send("ciao");
    };
    s.onmessage = function(e) {
        var bb = document.getElementById('blackboard')
        var html = bb.innerHTML;
        bb.innerHTML = html + '<br/>' + e.data;
    };
    s.onerror = function(e) {
        alert(e);
    }
    s.onclose = function(e) {
        alert("connection closed");
    }
    function invia() {
        var value = document.getElementById('testo').value;
        s.send(value);
    }
  </script>
  </head>
  <body>
    <h1>WebSocket</h1>
    <input type="text" id="testo" />
    <input type="button" value="invia" onClick="invia();" />
    <div id="blackboard"
        style="width: 640px; height: 480px; background-color: black; color: white; border: solid 2px red; overflow: auto">
    </div>
  </body>
  </html>
  
  # wstest.ini
  [uwsgi]
  plugins = coroae
  chdir = /$PROJECT_DIR
  logger = file:log/demo.log
  psgi = bin/startup.pl
  master = true
  processes = 4
  coroae = 1000
  perl-no-plack = true
  psgi-enable-psgix-io = true
  uid = $PROJECT_USER
  gid = www-data
  chmod-socket = 664

AUTHOR

This module was written and is maintained by Anton Petrusevich.

Copyright and License

Copyright (c) 2016 Anton Petrusevich. Some Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.