Class: AutomateEm::Communicator

Inherits:
Object
  • Object
show all
Defined in:
lib/automate-em/core/communicator.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(system) ⇒ Communicator 



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# File 'lib/automate-em/core/communicator.rb', line 11

def initialize(system)
  @system = system
  
  @command_lock = Mutex.new
  @status_lock = Mutex.new
  
  @status_register = {}
  @connected_interfaces = {}
  
  @shutdown = true
end

Class Method Details

.select(user, interface, system) ⇒ Object

Set the system to communicate with Up to interfaces to maintain stability here (They should deal with errors)



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# File 'lib/automate-em/core/communicator.rb', line 70

def self.select(user, interface, system)
  System.logger.debug "-- Interface #{interface.class} attempting to select system #{system}"
  if system == 0
    return nil unless user[:system_admin]
    System.communicator.attach(interface)
  else
    sys = nil
    
    if user.is_a? User
      sys = user.control_systems.select('control_systems.id').where('control_systems.id = ? AND control_systems.active = ?', system.to_i, true).first
      
    elsif user.is_a?(TrustedDevice) && user.control_system_id == system.to_i
      sys = User.find(user.user_id).control_systems.select('control_systems.id, control_systems.active').where('control_systems.id = ?', system.to_i).first
      if sys.nil?
        #

        # Kill comms, this key is not valid

        # Invalidate key

        #

        user.expires = Time.now
        user.save
        interface.shutdown
        return nil
      elsif sys.active == false
        #

        # System offline... Disconnect

        #

        return false
      end
    end
    
    system = sys.nil? ? nil : sys.id
    if System[system].nil?
      interface.shutdown #kill comms

      return nil
    end
    
    System.logger.debug "-- Interface #{interface.class} selected system #{system}"
    return System[system].communicator.attach(interface)
  end
end

.system_list(user) ⇒ Object

Systems avaliable to this user



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# File 'lib/automate-em/core/communicator.rb', line 54

def self.system_list(user)
  response = {:ids => [], :names => []}
  
  if user.class == User
    user.control_systems.select('control_systems.id, control_systems.name').each do |controller|
      response[:ids] << controller.id
      response[:names] << controller.name
    end   # We ignore token requests here as they should know the system they can connect to

  end
  return response
end

Instance Method Details

#attach(interface) ⇒ Object 



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# File 'lib/automate-em/core/communicator.rb', line 304

def attach(interface)
  @status_lock.synchronize {
    return nil if @shutdown || interface.nil?
    @connected_interfaces[interface] = [] unless @connected_interfaces.include?(interface)
  }
  return self
end

#disconnected(interface) ⇒ Object

Keep track of connected systems



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# File 'lib/automate-em/core/communicator.rb', line 117

def disconnected(interface)
  @status_lock.synchronize {
    status_array = @connected_interfaces.delete(interface)
    status_array.each do |status_hash|
      status_hash.delete(interface)
    end
    #

    # TODO::Refactor required

    # This still isn't perfect as we could be observing modules we are not using...

    #

  }
  logger.debug "-- Interface #{interface.class} disconnected" unless logger.nil?
end

#logger ⇒ Object 



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# File 'lib/automate-em/core/communicator.rb', line 24

def logger
  @system.logger
end

#register(interface, mod, status, &block) ⇒ Object

Keep track of status events



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# File 'lib/automate-em/core/communicator.rb', line 135

def register(interface, mod, status, &block)
  mod_sym = mod.class == String ? mod.to_sym : mod # remember the symbol used by the interface to reference this module

  status = status.to_sym if status.class == String
  
  if @system.modules[mod_sym].present?
    mod = @system.modules[mod_sym].instance # most efficient


    theVal = nil
    @status_lock.synchronize {
      @status_register[mod] ||= {}
      @status_register[mod][status] ||= {}
      @status_register[mod][status][interface] = mod_sym
      @connected_interfaces[interface] << @status_register[mod][status] unless @connected_interfaces[interface].nil?
      theVal = mod[status]
    }
    
    mod.add_observer(self)
    logger.debug "-- Interface #{interface.class} registered #{mod_sym}:#{status}"
    
    #

    # Send the status to this requestor!

    # This is the same as in update

    #

    if !theVal.nil?
      begin
        function = "#{mod_sym.to_s.downcase}_#{status}_changed".to_sym
        
        if interface.respond_to?(function)
          interface.__send__(function, theVal)
        else
          interface.notify(mod_sym, status, theVal)
        end
      rescue => e
        AutomateEm.print_error(logger, e, {
          :message => "in communicator.rb, register : bad interface or user module code",
          :level => Logger::ERROR
        })
      end
    end
  else
    logger.warn "in communicator.rb, register : #{interface.class} called register on a bad module name"
    block.call() unless block.nil?  # Block will inform of any errors

  end
rescue => e
  begin
    AutomateEm.print_error(logger, e, {
      :message => "in communicator.rb, register : #{interface.class} failed to register #{mod.inspect}.#{status.inspect}",
      :level => Logger::ERROR
    })
    block.call() unless block.nil?  # Block will inform of any errors

  rescue => x
    AutomateEm.print_error(logger, x, {
      :message => "in communicator.rb, register : #{interface.class} provided a bad block",
      :level => Logger::WARN
    })
  end
ensure
  ActiveRecord::Base.clear_active_connections!
end

#send_command(mod, command, *args, &block) ⇒ Object

Pass commands to the selected system



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# File 'lib/automate-em/core/communicator.rb', line 269

def send_command(mod, command, *args, &block)
  #

  # Accept String, argument array

  #  String

  #

  mod = mod.to_sym if mod.class == String
  logger.debug "-- Command requested #{mod}.#{command}(#{args})"
  
  begin
    @command_lock.synchronize {
      if @system != System
        @system.modules[mod].instance.public_send(command, *args) # Not send string however call function command

      else
        @system.public_send(command, *args)
      end
    }
  rescue => e
    AutomateEm.print_error(logger, e, {
      :message => "module #{mod} in communicator.rb, send_command : command unavaliable or bad module code",
      :level => Logger::WARN
    })
    begin
      block.call() unless block.nil? # Block will inform of any errors

    rescue => x
      AutomateEm.print_error(logger, x, {
        :message => "in communicator.rb, send_command : interface provided bad block",
        :level => Logger::ERROR
      })
    end
  ensure
    ActiveRecord::Base.clear_active_connections!
  end
end

#shutdown ⇒ Object 



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# File 'lib/automate-em/core/communicator.rb', line 29

def shutdown
  @status_lock.synchronize {
    @shutdown = true
    @system.modules.each_value do |mod|
      mod.instance.delete_observer(self)
    end
    @status_register = {}     
    @connected_interfaces.each_key do |soc|
      soc.shutdown
    end
  }
  logger.debug "-- Communicator shutdown"
end

#start(nolog = false) ⇒ Object

Logging isn’t active for the very first of these



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# File 'lib/automate-em/core/communicator.rb', line 43

def start(nolog = false)      # Logging isn't active for the very first of these

  @status_lock.synchronize {
    @shutdown = false
  }
  logger.debug "-- Communicator started" unless nolog
end

#unregister(interface, mod, status, &block) ⇒ Object 



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# File 'lib/automate-em/core/communicator.rb', line 195

def unregister(interface, mod, status, &block)
  mod_sym = mod.to_sym if mod.class == String
  status = status.to_sym if status.class == String
  
  mod = @system.modules[mod_sym].instance
  logger.debug "Interface #{interface.class} unregistered #{mod_sym}:#{status}"

  @status_lock.synchronize {
    @status_register[mod] ||= {}
    @status_register[mod][status] ||= {}
    @status_register[mod][status].delete(interface)
    @connected_interfaces[interface].delete(@status_register[mod][status]) unless @connected_interfaces[interface].nil?

    #

    # TODO:: deleteing the observer will delete all status updates

    # This needs to be more selective.

    # We only delete the observer if all the mod[status]'s are empty

    #

    #if @status_register[mod][status].empty?

    # mod.delete_observer(self)

    #end

  }
rescue => e
  logger.warn "in communicator.rb, unregister : #{interface.class} called unregister when it was not needed"
  #logger.warn e.message

  #logger.warn e.backtrace

  begin
    block.call() if !block.nil? # Block will inform of any errors

  rescue => x
    AutomateEm.print_error(logger, x, {
      :message => "in communicator.rb, unregister : #{interface.class} provided a bad block",
      :level => Logger::WARN
    })
  end
end

#update(mod, status, data) ⇒ Object 



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# File 'lib/automate-em/core/communicator.rb', line 231

def update(mod, status, data)
  @status_lock.synchronize {
    return if @status_register[mod].nil? || @status_register[mod][status].nil?
  
    #

    # Interfaces should implement the notify function

    # Or a function for that particular event

    #

    @status_register[mod][status].each_pair do |interface, mod|
      EM.defer do  # to avoid deadlock

        begin
          function = "#{mod.to_s.downcase}_#{status}_changed".to_sym
          if interface.respond_to?(function)       # Can provide a function to deal with status updates

            interface.__send__(function, data)
          else
            interface.notify(mod, status, data)
          end
        rescue => e
          AutomateEm.print_error(logger, e, {
            :message => "in communicator.rb, update : bad interface or user module code",
            :level => Logger::ERROR
          })
        ensure
          ActiveRecord::Base.clear_active_connections!
        end
      end
    end
  }
rescue => e
  AutomateEm.print_error(logger, e, {
    :message => "in communicator.rb, update : This should never happen",
    :level => Logger::ERROR
  })
end