Utopia::Websocket

A simple synchronous websocket server implementation. Designed for short term connections and best on thread-per-request application servers (e.g. puma).

Installation

Add this line to your application's Gemfile:

    gem 'utopia-websocket'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install utopia-websocket

Usage

Here is how to use within Utopia::Controller:

on 'list' do |request|
    fail! unless Utopia::WebSocket?(request.env)

    Utopia::WebSocket.open(request.env) do |connection|
        read, write = IO.pipe

        Process.spawn("ls -lah", :out => write)
        write.close

        read.each_line do |line|
            connection.text(line)
        end

        connection.close
    end

    success!
end

connection is an instance of WebSocket::Driver.

If you want to handle incoming messages, you must listen for these and then handle them:

on 'echo' do |request|
    fail! unless Utopia::WebSocket?(request.env)

    Utopia::WebSocket.open(request.env) do |connection|
        connection.on(:message) do |event|
            connection.text(event.data)
            connection.close
        end
    end

    success!
end

This implementation is currently not designed for many long-term connections as it will 'use' one request for the duration of the websocket life. However, this model is rather simple and easy to reason about. For more complex client/server interactions, a dedicated server using Celluloid might be more appropriate.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

License

Released under the MIT license.

Copyright, 2015, by Samuel G. D. Williams.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.