Class: Faye::Server

Inherits:
Object
  • Object
show all
Includes:
Extensible, Logging
Defined in:
lib/faye/protocol/server.rb,
lib/faye/protocol/socket.rb

Defined Under Namespace

Classes: Socket

Constant Summary collapse

META_METHODS = 
%w[handshake connect disconnect subscribe unsubscribe]

Constants included from Logging

Logging::LOG_LEVELS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Extensible

#add_extension, #pipe_through_extensions, #remove_extension

Constructor Details

#initialize(options = {}) ⇒ Server

Returns a new instance of Server.



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# File 'lib/faye/protocol/server.rb', line 13

def initialize(options = {})
  @options    = options || {}
  engine_opts = @options[:engine] || {}
  engine_opts[:timeout] = @options[:timeout]
  @engine     = Faye::Engine.get(engine_opts)

  info('Created new server: ?', @options)
end

Instance Attribute Details

#engine ⇒ Object (readonly)

Returns the value of attribute engine.



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# File 'lib/faye/protocol/server.rb', line 11

def engine
  @engine
end

Instance Method Details

#advize(response, connection_type) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 122

def advize(response, connection_type)
  return unless [Channel::HANDSHAKE, Channel::CONNECT].include?(response['channel'])

  if connection_type == 'eventsource'
    interval = (@engine.timeout * 1000).floor
    timeout  = 0
  else
    interval = (@engine.interval * 1000).floor
    timeout  = (@engine.timeout * 1000).floor
  end

  advice = response['advice'] ||= {}
  if response['error']
    advice['reconnect'] ||= 'handshake'
  else
    advice['reconnect'] ||= 'retry'
    advice['interval']  ||= interval
    advice['timeout']   ||= timeout
  end
end

#close ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 22

def close
  @engine.close
end

#close_socket(client_id, close = true) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 31

def close_socket(client_id, close = true)
  @engine.flush_connection(client_id, close)
end

#connect(message, local = false, &callback) ⇒ Object

MUST contain * clientId

* connectionType

MAY contain * ext

* id



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# File 'lib/faye/protocol/server.rb', line 178

def connect(message, local = false, &callback)
  response        = make_response(message)
  client_id       = message['clientId']
  connection_type = message['connectionType']

  @engine.client_exists(client_id) do |exists|
    response['error'] = Error.client_unknown(client_id) unless exists
    response['error'] = Error.parameter_missing('clientId') if client_id.nil?

    unless CONNECTION_TYPES.include?(connection_type)
      response['error'] = Error.conntype_mismatch(connection_type)
    end

    response['error'] = Error.parameter_missing('connectionType') if connection_type.nil?

    response['successful'] = response['error'].nil?

    if !response['successful']
      response.delete('clientId')
      next callback.call(response)
    end

    if message['connectionType'] == 'eventsource'
      message['advice'] ||= {}
      message['advice']['timeout'] = 0
    end

    @engine.connect(response['clientId'], message['advice']) do |events|
      callback.call([response] + events)
    end
  end
end

#disconnect(message, local = false, &callback) ⇒ Object

MUST contain * clientId MAY contain * ext

* id



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# File 'lib/faye/protocol/server.rb', line 214

def disconnect(message, local = false, &callback)
  response   = make_response(message)
  client_id  = message['clientId']

  @engine.client_exists(client_id) do |exists|
    response['error'] = Error.client_unknown(client_id) unless exists
    response['error'] = Error.parameter_missing('clientId') if client_id.nil?

    response['successful'] = response['error'].nil?
    response.delete('clientId') unless response['successful']

    @engine.destroy_client(client_id) if response['successful']
    callback.call(response)
  end
end

#handle(message, local = false, &callback) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 84

def handle(message, local = false, &callback)
  return callback.call([]) if !message
  info('Handling message: ? (local: ?)', message, local)

  channel_name = message['channel']
  error        = message['error']

  return handle_meta(message, local, &callback) if Channel.meta?(channel_name)

  if Grammar::CHANNEL_NAME !~ channel_name
    error = Faye::Error.channel_invalid(channel_name)
  end

  @engine.publish(message) unless error

  response = make_response(message)
  response['error'] = error if error
  response['successful'] = !response['error']
  callback.call([response])
end

#handle_meta(message, local, &callback) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 105

def handle_meta(message, local, &callback)
  method = Channel.parse(message['channel'])[1]

  unless META_METHODS.include?(method)
    response = make_response(message)
    response['error'] = Faye::Error.channel_forbidden(message['channel'])
    response['successful'] = false
    return callback.call([response])
  end

  __send__(method, message, local) do |responses|
    responses = [responses].flatten
    responses.each { |r| advize(r, message['connectionType']) }
    callback.call(responses)
  end
end

#handshake(message, local = false, &callback) ⇒ Object

MUST contain * version

* supportedConnectionTypes

MAY contain * minimumVersion

* ext
* id



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# File 'lib/faye/protocol/server.rb', line 148

def handshake(message, local = false, &callback)
  response = make_response(message)
  response['version'] = BAYEUX_VERSION

  response['error'] = Error.parameter_missing('version') if message['version'].nil?

  client_conns = message['supportedConnectionTypes']

  response['supportedConnectionTypes'] = CONNECTION_TYPES

  if client_conns
    common_conns = client_conns.select { |c| CONNECTION_TYPES.include?(c) }
    response['error'] = Error.conntype_mismatch(*client_conns) if common_conns.empty?
  else
    response['error'] = Error.parameter_missing('supportedConnectionTypes')
  end

  response['successful'] = response['error'].nil?
  return callback.call(response) unless response['successful']

  @engine.create_client do |client_id|
    response['clientId'] = client_id
    callback.call(response)
  end
end

#make_response(message) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 72

def make_response(message)
  response = {}

  response['id']       = message['id']       if message['id']
  response['clientId'] = message['clientId'] if message['clientId']
  response['channel']  = message['channel']  if message['channel']
  response['error']    = message['error']    if message['error']

  response['successful'] = !response['error']
  response
end

#open_socket(client_id, socket, env) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 26

def open_socket(client_id, socket, env)
  return unless client_id and socket
  @engine.open_socket(client_id, Socket.new(self, socket, env))
end

#process(messages, env, &callback) ⇒ Object 



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# File 'lib/faye/protocol/server.rb', line 35

def process(messages, env, &callback)
  local    = env.nil?
  messages = [messages].flatten
  info('Processing messages: ? (local: ?)', messages, local)

  return callback.call([]) if messages.size == 0
  processed, responses = 0, []

  gather_replies = lambda do |replies|
    responses.concat(replies)
    processed += 1
    responses.compact!
    info('Returning replies: ?', responses)
    callback.call(responses) if processed == messages.size
  end

  handle_reply = lambda do |replies|
    extended, expected = 0, replies.size
    gather_replies.call(replies) if expected == 0

    replies.each_with_index do |reply, i|
      debug('Processing reply: ?', reply)
      pipe_through_extensions(:outgoing, reply, env) do |message|
        replies[i] = message
        extended  += 1
        gather_replies.call(replies) if extended == expected
      end
    end
  end

  messages.each do |message|
    pipe_through_extensions(:incoming, message, env) do |piped_message|
      handle(piped_message, local, &handle_reply)
    end
  end
end

#subscribe(message, local = false, &callback) ⇒ Object

MUST contain * clientId

* subscription

MAY contain * ext

* id



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# File 'lib/faye/protocol/server.rb', line 234

def subscribe(message, local = false, &callback)
  response     = make_response(message)
  client_id    = message['clientId']
  subscription = [message['subscription']].flatten

  @engine.client_exists(client_id) do |exists|
    response['error'] = Error.client_unknown(client_id) unless exists
    response['error'] = Error.parameter_missing('clientId') if client_id.nil?
    response['error'] = Error.parameter_missing('subscription') if message['subscription'].nil?

    response['subscription'] = message['subscription'] || []

    subscription.each do |channel|
      next if response['error']
      response['error'] = Error.channel_forbidden(channel) unless local or Channel.subscribable?(channel)
      response['error'] = Error.channel_invalid(channel) unless Channel.valid?(channel)

      next if response['error']
      @engine.subscribe(client_id, channel)
    end

    response['successful'] = response['error'].nil?
    callback.call(response)
  end
end

#unsubscribe(message, local = false, &callback) ⇒ Object

MUST contain * clientId

* subscription

MAY contain * ext

* id



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# File 'lib/faye/protocol/server.rb', line 264

def unsubscribe(message, local = false, &callback)
  response     = make_response(message)
  client_id    = message['clientId']
  subscription = [message['subscription']].flatten

  @engine.client_exists(client_id) do |exists|
    response['error'] = Error.client_unknown(client_id) unless exists
    response['error'] = Error.parameter_missing('clientId') if client_id.nil?
    response['error'] = Error.parameter_missing('subscription') if message['subscription'].nil?

    response['subscription'] = message['subscription'] || []

    subscription.each do |channel|
      next if response['error']
      response['error'] = Error.channel_forbidden(channel) unless local or Channel.subscribable?(channel)
      response['error'] = Error.channel_invalid(channel) unless Channel.valid?(channel)

      next if response['error']
      @engine.unsubscribe(client_id, channel)
    end

    response['successful'] = response['error'].nil?
    callback.call(response)
  end
end