Canson

small rack based framework that can run websocket. 20K connections can be handled

Run the example chat app

cd spec/test_app_root
bundle install
bundler exec iodine -p 3000 -t 16 -w 4

open localhost:3000 in browser

Example app

in spec/test_app_root

require 'canson'
class TestApp < Canson::Base

  def self.print_out
    puts 'hijack'
  end

  get '/' do
    print_out
    {results: 'hi'}
  end

  get '/ask' do |params|
    name = params[:name]
    {results: name}
  end

   on_open do
    puts '================================'
    puts 'We have a websocket connection'
    puts '================================'
  end

  on_close do
    puts "Bye Bye... #{count} connections left..."
  end

  on_shutdown do
    write 'The server is shutting down, goodbye.'
  end

  on_message do |params|
    data = params[:data]
    ws = params[:ws]
    nickname = params[:nickname]
    tmp = "#{nickname}: #{data}"
    ws.write tmp
    ws.each { |h| h.write tmp }
    puts '================================'
    puts "got message: #{data} encoded as #{data.encoding}"
    puts "broadcasting #{tmp.bytesize} bytes with encoding #{tmp.encoding}"
    puts '================================'
  end
end

require './test_app.rb'
run TestApp.new

Usage

Given the following piece of ruby code:

# config.ru

require "canson"

get "/index" do
  { results: [1, 2, 3] }
end

The server is run via bundle exec rackup --port 3000.

When requested with curl http://localhost:3000/bla -i, it should return:

HTTP/1.1 200 OK
Content-Type: application/json

{"results": [1, 2, 3]}

Given the following piece of ruby code:

# config.ru

require "trialday"

get "/bla" do
  { results: [1, 2, 3] }
end

post "/bla" do |params|
  name = params[:name]

  { name: name }
end

When requested with curl http://localhost:3000/index -i, it should return:

HTTP/1.1 200 OK
Content-Type: application/json

{"results": [1, 2, 3]}

When requested with curl -XPOST http://localhost:3000/bla -i -H "Content-Type: application/json" -d '{"name": "Mario"}', it should return:

HTTP/1.1 200 OK
Content-Type: application/json

{"name": "Mario"}