openvidu-basic-ruby 🔗

Check it on GitHub

This is a minimal OpenVidu server application sample built for Ruby with Sinatra. It internally uses the OpenVidu REST API.

Running this application 🔗

Prerequisites 🔗

To run this application you will need Ruby installed on your system:

• Ruby

Download repository 🔗

git clone https://github.com/OpenVidu/openvidu-tutorials.git -b v2.28.0
cd openvidu-tutorials/openvidu-basic-ruby

Install dependencies 🔗

bundle install

Run application 🔗

ruby app.rb

Understanding the code 🔗

The application is a simple Ruby application using the popular Sinatra (web server) and Faraday (http client) libraries. It has a single controller file app.rb that exports two endpoints:

• /api/sessions : Initialize a session.
• /api/sessions/:sessionId/connections : Create a connection.

You can get more information about these endpoints in the Application Server Endpoints section.

Let's see the code of the controller:

require 'sinatra'
require 'sinatra/cors'
require 'faraday'
require 'json'
require './env.rb'

# Load env variables
SERVER_PORT = ENV['SERVER_PORT']
OPENVIDU_URL = ENV['OPENVIDU_URL']
OPENVIDU_SECRET = ENV['OPENVIDU_SECRET']

set :port, SERVER_PORT

register Sinatra::Cors
set :allow_origin, "*"
set :allow_methods, "POST,OPTIONS"
set :allow_headers, "content-type"

Starting by the top, the app.rb file has the following statements:

• All the require instructions: load the necessary libraries and environment variables.
• SERVER_PORT: port of the application server.
• OPENVIDU_URL: the URL of your OpenVidu deployment.
• OPENVIDU_SECRET: the secret of your OpenVidu deployment.

Then the application configures the port retrieved from the environment variables (file env.rb) and sets the CORS configuration for Sinatra. The CORS policy is configured to allow requests from any origin and any header.

Initialize session endpoint 🔗

The first endpoint allows us to initialize a new OpenVidu Session. The code of this endpoint is the following:

post '/api/sessions' do
  begin
    body = request.body.read
    response = Faraday.post do |req|
      req.url "#{OPENVIDU_URL}openvidu/api/sessions"
      req.headers['Content-Type'] = 'application/json'
      req.headers['Authorization'] = "Basic #{Base64.encode64("OPENVIDUAPP:#{OPENVIDU_SECRET}").strip}"
      req.body = body
    end
    if response.success?
      (JSON.parse response.body)['sessionId']
    else
      if response.status == 409
        # Session already exists in OpenVidu
        (JSON.parse body)['customSessionId']
      else
        status response.status
        body response.body
      end
    end
  rescue Faraday::Error => err
    err.response
  end
end

The endpoint creates a new Session using the OpenVidu REST API and returns the sessionId of the new session. If the request brought a customSessionId parameter and that session already existed in the OpenVidu deployment (that's the 409 CONFLICT error), then the endpoint simply returns the same customSessionId. At this point the Session is ready to create Connections, whether it is a newly created Session or an already existing one.

Create connection endpoint 🔗

The second endpoint allows us to create a new OpenVidu Connection in the session:

post '/api/sessions/:sessionId/connections' do
  begin
    body = request.body.read
    response = Faraday.post do |req|
      req.url "#{OPENVIDU_URL}openvidu/api/sessions/#{params['sessionId']}/connection"
      req.headers['Content-Type'] = 'application/json'
      req.headers['Authorization'] = "Basic #{Base64.encode64("OPENVIDUAPP:#{OPENVIDU_SECRET}").strip}"
      req.body = body
    end
    if response.success?
      (JSON.parse response.body)['token']
    else
      status response.status
      body response.body
    end
  rescue Faraday::Error => err
    err.response
  end
end

The endpoint creates a new Connection using the OpenVidu REST API and returns the token of the new connection. We can use this token in openviu-browser SDK to connect the user to the Session.