Class: RComet::RackAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/rcomet/rack_adapter.rb

Overview

:nodoc:

Instance Method Summary collapse

Constructor Details

#initialize(app = nil, options = nil, &block) ⇒ RackAdapter

Returns a new instance of RackAdapter.



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# File 'lib/rcomet/rack_adapter.rb', line 22

def initialize(app = nil, options = nil, &block)
  @app      = app if app.respond_to?(:call)
  @options  = [app, options].grep(Hash).first
  @channels = RComet::ChannelSet.new
  @users    = Hash.new
  @timeout  = nil
  
  instance_eval(&block) if block
  return @app  
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 33

def call(env)
  request = Rack::Request.new(env)
  
  if request.params.empty?
    [404, {'Content-Type' => 'text/html'}, ""]
  else
    messages = JSON.parse(request.params['message'])
    jsonp    = request.params['jsonp'] || JSONP_CALLBACK
    get      = request.get?

    process( jsonp, messages, get )
  end
end

#channel ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 47

def channel
  @channels
end

#connect(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 110

def connect( message )
  # Initialize response
  response = { 
    'channel' => RComet::Channel::CONNECT,
    'clientId' => message['clientId']
  }
  response << { 'id' => message['id'] } if message.has_key?('id')

  # Get user for clientId
  user = @users[message['clientId']]
  if user
    # Ok, connect user
    user.connected = true
    time = Time.new
    response << {
      'successful'  => true,
      'timestamp'   =>"#{time.hour}:#{time.min}:#{time.sec} #{time.year}"
    }
    
    if user.has_channel?
      response = user.wait( response )
    end
    user.connected = false
  else
    # User does not exist!
    response << {
      'successful'  => false,
      'error'       => "402:#{message['clientId']}:Unknown Client ID"
    }
  end
  
  return response
end

#disconnect(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 144

def disconnect( message )
  # Initialize response message
  response = {
    'channel'     => RComet::Channel::DISCONNECT,
    'clientId'    => message['clientId']
  }
  response << { 'id' => message['id'] } if message.has_key?('id')
  
  # Get user for clientId
  user = @users[message['clientId']]
  if user
    # Ok, disconnect user
    user.connected = false
    @users.delete( message['clientId'] )
    
    # Complete reponse
    response << {
      'successful'  => true
    }
  else
    # User does nit exist!
    response << {
      'successful'  => false,
      'error'       => "402:#{message['clientId']}:Unknown Client ID"
    }
  end
  
  return response
end

#handle(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 256

def handle( message )
  # Initialize response
  response = { 
    'channel' => message['channel']
  }
  response << { 'id' => message['id'] } if message.has_key?('id')

  c = channel[message['channel']]
  if c.nil?
    response << {
      'successful'  => false,
      'error'       => "404:#{message['channel']}:Unknown Channel"
    }
  else
    response << {
      'successful'  => true
    }
  end
        
  Thread.new do
    unless c.nil?
      if c.handler.nil?
        c.data( message['data'] )
      else
        c.handler.call( message )
      end
    end
    return
  end
  
  return response      
end

#handshake(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 91

def handshake( message )
  begin
    user = User.new(self)
  end while @users.has_key?(user.id)
  @users[user.id] = user
  
  response = {
    'channel'                   => RComet::Channel::HANDSHAKE,
    'version'                   => RComet::BAYEUX_VERSION,
    'minimumVersion'            => RComet::BAYEUX_VERSION,
    'supportedConnectionTypes'  => ['long-polling','callback-polling'],
    'clientId'                  => user.id,
    'successful'                => true
  }
  response << { 'id' => message['id'] } if message.has_key?('id')
  
  return response
end

#process(jsonp, messages, get) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 56

def process( jsonp, messages, get )
  replies = []
  messages.each do |message|
    reply = nil
    case message['channel'] 
      when RComet::Channel::HANDSHAKE
        reply = handshake( message )
      when RComet::Channel::CONNECT
        reply = connect( message )
      when RComet::Channel::DISCONNECT
        reply = disconnect( message )
      when RComet::Channel::SUBSCRIBE
        reply = subscribe( message )
      when RComet::Channel::UNSUBSCRIBE
        reply = unsubscribe( message )
      else
        reply = handle( message )
    end
    if reply.class == Array
      replies.concat( reply )
    else
      replies << reply
    end
  end
  
  response = JSON.generate(replies)
  type = {'Content-Type' => 'text/json'}
  if get
    response = "#{jsonp}(#{response});"
    type = {'Content-Type' => 'text/javascript'}
  end
  
  [200, type, [response]]
end

#subscribe(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 174

def subscribe( message )
  response = {
    'channel'     => RComet::Channel::SUBSCRIBE,
    'clientId'    => message['clientId']
  }
  response << { 'id' => message['id'] } if message.has_key?('id')
  
  # Get user for clientId
  user = @users[message['clientId']]
  if user
    # Get channel
    channel = @channels[message['subscription']]
    if channel
      user.subscribe( channel )
      response << {
        'successful'    => true,
        'subscription'  => message['subscription']
      }
      
      unless channel.data.nil?
        response = [response]
        response << { 
          'channel'   => message['subscription'],
          'id'        => (message['id'].to_i+1).to_s,
          'data'      => channel.data
        }
      end
    else
      #Channel doesn't exist
      response << {
        'successful'    => false,
        'subscription'  => message['subscription'],
        'error'         => "404:#{message['subscription']}:Unknown Channel"
      }
    end
  else
    response << {
      'successful'  => false,
      'error'       => "402:#{message['clientId']}:Unknown Client ID"
    }
  end

  return response
end

#timeout(&block) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 51

def timeout( &block )
  @handler = block if block_given?
  @handler
end

#unsubscribe(message) ⇒ Object 



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# File 'lib/rcomet/rack_adapter.rb', line 219

def unsubscribe( message )
  # Initialize response
  response = {
    'channel'     => RComet::Channel::UNSUBSCRIBE,
    'clientId'    => message['clientId']
  }
  response << { 'id' => message['id'] } if message.has_key?('id')

  # Get user for clientId
  user = @users[message['clientId']]
  if user
    # Get channel
    channel = @channels[message['subscription']]
    if channel
      user.unsubscribe( channel )
      response << {
        'successful'    => true,
        'subscription'  => message['subscription']
      }
    else
      #Channel doesn't exist
      response << {
        'successful'    => false,
        'subscription'  => message['subscription'],
        'error'         => "404:#{message['subscription']}:Unknown Channel"
      }
    end
  else
    response << {
      'successful'  => false,
      'error'       => "402:#{message['clientId']}:Unknown Client ID"
    }
  end
  
  return response
end