padrino && websockets

Question

i'm looking for a way to open and use websockets from within a Padrino application. i know Padrino works with a single thread but i'm looking for a way to open websockets and share variables between its "onopen" "onclose" "onmessage" methods and Padrino controllers.

any idea how it's done ?

links i looked into:

Examples of Eventmachine usage with Padrino and Sinatra (only Sinatra worked for me) em-websocket on GitHub

UPDATE 1: this is my main.rb:

    require 'rubygems'      # <-- Added this require
require 'em-websocket'
require 'padrino-core'
require 'thin'

require File.expand_path("../config/boot.rb", __FILE__)

SOCKETS = []
EventMachine.run do     # <-- Changed EM to EventMachine
#  class App < Sinatra::Base
#      get '/' do
#          SOCKETS.each {|s| s.send "fooooo"}
#          return "foo"
#      end
#  end

  EventMachine::WebSocket.start(:host => '0.0.0.0', :port => 8080) do |ws| # <-- Added |ws|
      # Websocket code here
      ws.onopen {
          ws.send "connected!!!!"
          SOCKETS << ws
      }

      ws.onmessage { |msg|
          puts "got message #{msg}"
          ws.send "ECHO: #{msg}"
      }

      ws.onclose   {
          ws.send "WebSocket closed"
          SOCKETS.delete ws
      }

  end

  # You could also use Rainbows! instead of Thin.
  # Any EM based Rack handler should do.
  #App.run!({:port => 3000})    # <-- Changed this line from Thin.start to App.run!
  Thin::Server.start Padrino.application, '0.0.0.0', 3000

end

i'm getting this exception:

/home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/daemonizing.rb:2:in `require': no such file to load -- daemons (LoadError)
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/daemonizing.rb:2:in `<top (required)>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:50:in `<class:Server>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:48:in `<module:Thin>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/thin-1.2.11/lib/thin/server.rb:1:in `<top (required)>'
    from main.rb:39:in `block in <main>'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `call'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
    from /home/cstore/.rvm/gems/ruby-1.9.2-p290@runtime/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
    from main.rb:9:in `<main>'

UPDATE 2: Resolved thanks to Nathan ! I just added 'daemons' to Gemfile and reloaded my application.

Try adding to the Gemfile: `gem 'daemons'` Typically that error means that the gem listed is either not installed to your gemset or not in the Gemfile. — Nathan, Sep 21 '11 at 09:53
For reference the line that is generating this exception is simply trying to load the daemons library: https://github.com/macournoyer/thin/blob/v1.2.1/lib/thin/daemonizing.rb#L2 — Nathan, Sep 21 '11 at 09:56
i added that gem. didn't work.... i just tried again and it worked. God works in mysterious ways :) THANKS ALOT !!! — refaelos, Sep 21 '11 at 10:41

DAddYE · Accepted Answer · 2011-09-22T11:06:59.837

3

Maybe you need to install daemons:

Edit your Gemfile:

# Adding this
gem 'daemons'

Install missing gems:

$ bundle install

edited Sep 22 '11 at 11:06

answered Sep 21 '11 at 09:39

DAddYE

1,719
11
16

1

Yeah or just try adding to the Gemfile: gem 'daemons' and then run `bundle install` – Nathan Sep 21 '11 at 09:54

score 1 · Answer 2 · answered Oct 26 '12 at 15:13

I ran across this post and it helped me a bit, but I wanted to offer an alternative solution to anyone else who might stumble upon it. I chose to just directly modify the config.ru and mount a websocket-rack application.

Here's my config.ru where WSApp is a subclass of Rack::WebSocket::Application and is placed in the lib/ directory (therefore being automatically loaded by Padrino):

#!/usr/bin/env rackup
# encoding: utf-8

# This file can be used to start Padrino,
# just execute it from the command line.

require File.expand_path("../config/boot.rb", __FILE__)

# Setup routes
map '/' do
  run Padrino.application
end
map '/ws' do
  run WSApp.new
end

score 1 · Answer 3 · edited May 23 '17 at 10:34

1

What in particular from this example: https://github.com/igrigorik/em-websocket and Any success with Sinatra working together with EventMachine WebSockets? didn't work with Padrino but did with Sinatra? Can you explain the errors you got and why those examples failed (stacktraces)? Maybe we can help investigate.

edited May 23 '17 at 10:34

Community

1
1

answered Sep 21 '11 at 09:32

Nathan

1,381
20
43
58

score 0 · Answer 4 · answered Apr 28 '14 at 10:48

0

Since this is the top hit in Google right now, I'd like to link it to padrino-websockets, a clean DSL for writing websockets applications in Padrino.

answered Apr 28 '14 at 10:48

Darío Javier Cravero

1,692
13
9

padrino && websockets

4 Answers4