Class: WebsocketRails::Synchronization

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/websocket_rails/synchronization.rb

Constant Summary

Constants included from Logging

Logging::ANSI, Logging::LOGGABLE_DATA

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logging

#color_for_level, #colorize, configure, #log, #log_data?, #log_event, #log_event?, #log_event_end, #log_event_start, #log_exception, #log_header, log_level, #wrap

Class Method Details

.all_users ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 8

def self.all_users
  singleton.all_users
end

.destroy_user(connection) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 20

def self.destroy_user(connection)
  singleton.destroy_user connection
end

.find_user(connection) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 12

def self.find_user(connection)
  singleton.find_user connection
end

.publish(event) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 24

def self.publish(event)
  singleton.publish event
end

.redis ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 36

def self.redis
  singleton.redis
end

.register_user(connection) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 16

def self.register_user(connection)
  singleton.register_user connection
end

.shutdown! ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 32

def self.shutdown!
  singleton.shutdown!
end

.singleton ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 40

def self.singleton
  @singleton ||= new
end

.synchronize! ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 28

def self.synchronize!
  singleton.synchronize!
end

Instance Method Details

#all_users ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 175

def all_users
  Fiber.new do
    redis.hgetall('websocket_rails.users')
  end.resume
end

#destroy_user(identifier) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 162

def destroy_user(identifier)
  Fiber.new do
    redis.hdel 'websocket_rails.users', identifier
  end.resume
end

#find_user(identifier) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 168

def find_user(identifier)
  Fiber.new do
    raw_user = redis.hget('websocket_rails.users', identifier)
    raw_user ? JSON.parse(raw_user) : nil
  end.resume
end

#generate_server_token ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 133

def generate_server_token
  begin
    token = SecureRandom.urlsafe_base64
  end while redis.sismember("websocket_rails.active_servers", token)

  token
end

#publish(event) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 63

def publish(event)
  Fiber.new do
    event.server_token = server_token
    redis.publish "websocket_rails.events", event.serialize
  end.resume
end

#redis ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 46

def redis
  @redis ||= begin
    redis_options = WebsocketRails.config.redis_options
    debug "Reactor is not running - engaging ruby redis" unless EM.reactor_running?
    debug "Reactor is running - engaging standard redis new" if EM.reactor_running?
    EM.reactor_running? ? Redis.new(redis_options) : ruby_redis
  end
end

#register_server(token) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 141

def register_server(token)
  Fiber.new do
    redis.sadd "websocket_rails.active_servers", token
    info "Server Registered: #{token}"
  end.resume
end

#register_user(connection) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 154

def register_user(connection)
  Fiber.new do
    id = connection.user_identifier
    user = connection.user
    redis.hset 'websocket_rails.users', id, user.as_json(root: false).to_json
  end.resume
end

#remove_server(token) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 148

def remove_server(token)
  ruby_redis.srem "websocket_rails.active_servers", token
  info "Server Removed: #{token}"
  EM.stop
end

#ruby_redis ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 55

def ruby_redis
  @ruby_redis ||= begin
    WebsocketRails.config.redis_options.merge(:driver => :ruby) unless WebsocketRails.config.redis_options.has_key? :driver
    redis_options = WebsocketRails.config.redis_options
    Redis.new(redis_options)
  end
end

#server_token ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 70

def server_token
  @server_token
end

#shutdown! ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 129

def shutdown!
  remove_server(server_token)
end

#synchronize! ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 74

def synchronize!
  unless @synchronizing
    @server_token = generate_server_token
    register_server(@server_token)

    synchro = Fiber.new do
      EM.defer do
        fiber_redis = Redis.new(WebsocketRails.config.redis_options)
        fiber_redis.subscribe "websocket_rails.events" do |on|
          debug "Subscribed to websocket_rails events"

          on.message do |_, encoded_event|
            event = Event.new_from_json(encoded_event, nil)

            # Do nothing if this is the server that sent this event.
            next if event.server_token == server_token

            # Ensure an event never gets triggered twice. Events added to the
            # redis queue from other processes may not have a server token
            # attached.
            event.server_token = server_token if event.server_token.nil?

            trigger_incoming event
          end
        end
      end
      info "Beginning Synchronization"
    end
    @synchronizing = true

    EM.next_tick { synchro.resume }

    trap('TERM') do
      Thread.new { shutdown! }
    end
    trap('INT') do
      Thread.new { shutdown! }
    end
    trap('QUIT') do
      Thread.new { shutdown! }
    end
  end
end

#trigger_incoming(event) ⇒ Object 



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# File 'lib/websocket_rails/synchronization.rb', line 118

def trigger_incoming(event)
  case
  when event.is_channel?
    WebsocketRails[event.channel].trigger_event(event)
  when event.is_user?
    connection = WebsocketRails.users[event.user_id.to_s]
    return if connection.nil?
    connection.trigger event
  end
end