Class: AutomateEm::System

Inherits:
Object
  • Object
show all
Defined in:
lib/automate-em/core/system.rb,
lib/automate-em/interfaces/html5.rb

Constant Summary collapse

@@controllers =

controller_id => system instance (0 is the system class)

{0 => self}
@@logger = 
nil
@@communicator =
TODO

remove the need for communicator.start

AutomateEm::Communicator.new(self)
@@god_lock = 
Mutex.new
@@socket_server = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#communicator ⇒ Object (readonly)

Returns the value of attribute communicator.



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# File 'lib/automate-em/core/system.rb', line 247

def communicator
  @communicator
end

#controller ⇒ Object (readonly)

Returns the value of attribute controller.



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# File 'lib/automate-em/core/system.rb', line 248

def controller
  @controller
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/automate-em/core/system.rb', line 249

def logger
  @logger
end

#modules ⇒ Object (readonly)

Returns the value of attribute modules.



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# File 'lib/automate-em/core/system.rb', line 246

def modules
  @modules
end

Class Method Details

.[](system) ⇒ Object 



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# File 'lib/automate-em/core/system.rb', line 211

def self.[] (system)
  if system.is_a?(Symbol) || system.is_a?(String)
    id = ControlSystem.where('name = ?', system.to_s).pluck(:id).first
    if id.nil? && system.is_a?(String)
      system = system.to_i
    else
      system = id
    end
  end
  
  @@god_lock.synchronize {
    @@controllers[system]
  }
end

.communicator ⇒ Object 



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# File 'lib/automate-em/core/system.rb', line 207

def self.communicator
  @@communicator
end

.force_load_file(path) ⇒ Object

Allows for system updates on the fly Dangerous (Could be used to add on the fly interfaces)



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# File 'lib/automate-em/core/system.rb', line 186

def self.force_load_file(path)
  load path if File.exists?(path) && File.extname(path) == '.rb'
rescue LoadError => e # load error explicitly handled

  AutomateEm.print_error(System.logger, e, {
    :message => "force load of #{path} failed",
    :level => Logger::ERROR
  })
end

.logger ⇒ Object

System Logger



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# File 'lib/automate-em/core/system.rb', line 199

def self.logger
  @@logger
end

.logger=(log) ⇒ Object 



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# File 'lib/automate-em/core/system.rb', line 203

def self.logger=(log)
  @@logger = log
end

.reload(dep) ⇒ Object

Reloads a dependency live This is the re-load code function (live bug fixing - removing / adding / modifying functions)



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# File 'lib/automate-em/core/system.rb', line 143

def self.reload(dep)
  System.logger.info "reloading dependency: #{dep}"
  
  dep = Dependency.find(dep)
  Modules.load_module(dep)
  
  updated = {}
  dep.devices.select('id').each do |dev|
    begin
      inst = DeviceModule.instance_of(dev.id)
      inst.on_update if (!!!updated[inst]) && inst.respond_to?(:on_update)
    ensure
      updated[inst] = true
    end
  end
  
  updated = {}
  dep.services.select('id').each do |ser|
    begin
      inst = ServiceModule.instance_of(ser.id)
      inst.on_update if (!!!updated[inst]) && inst.respond_to?(:on_update)
    ensure
      updated[inst] = true
    end
  end
  
  updated = {}
  dep.logics.select('id').each do |log|
    begin
      inst = LogicModule.instance_of(log.id)
      inst.on_update if (!!!updated[inst]) && inst.respond_to?(:on_update)
    ensure
      updated[inst] = true
    end
  end
  
  ActiveRecord::Base.clear_active_connections! # Clear any unused connections

end

.start(controller, log_level = Logger::INFO) ⇒ Object

Error thrown means: mark as offline, do not retry and email Return false means: retry and email if a second attempt fails Return true means: all is good! system running



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# File 'lib/automate-em/core/system.rb', line 16

def self.start(controller, log_level = Logger::INFO)
  begin
    
    #

    # Ensure we are dealing with a controller

    #

    if controller.is_a? Fixnum
      controller = ControlSystem.find(controller)
    elsif controller.is_a? String
      controller = ControlSystem.where('name = ?', controller).first
    end
    
    if not controller.is_a? ControlSystem
      raise 'invalid controller identifier'
    end
    
    
    #

    # Check if the system is already loaded or loading

    #

    @@god_lock.synchronize {
      if @@controllers[controller.id].present?
        return true
      end
      
      begin
        controller.reload(:lock => true)
        if controller.active
          return true
        else
          controller.active = true
        end
      ensure
        controller.save
      end
    }
    
    #

    # Create the system

    #

    system = System.new(controller, log_level)
    
    #

    # Load modules here (Producer)

    #

    proceed = Atomic.new(true)
    queue = Queue.new
    producer = Thread.new do  # New thread here to prevent circular waits on the thread pool

      begin
        controller.devices.includes(:dependency).each do |device|
          theClass = Modules.lazy_load(device.dependency)
          raise "Load Error" if theClass == false
          queue.push([device, theClass])
        end
        
        controller.services.includes(:dependency).each do |service|
          theClass = Modules.lazy_load(service.dependency)
          raise "Load Error" if theClass == false
          queue.push([service, theClass])
        end
        
        controller.logics.includes(:dependency).each do |logic|
          theClass = Modules.lazy_load(logic.dependency)
          raise "Load Error" if theClass == false
          queue.push([logic, theClass])
        end
      rescue
        proceed.value = false
      ensure
        ActiveRecord::Base.clear_active_connections!  # Clear any unused connections

        queue.push(:done)
      end
    end
    
    #

    # Consume the newly loaded modules here (Consumer)

    #

    mod = queue.pop
    while mod.is_a?(Array) && proceed.value == true
      begin
        system.load(*mod)
        
        mod = queue.pop
      rescue => e
        AutomateEm.print_error(@@logger, e, {
          :message => "Error stopping system after problems starting..",
          :level => Logger::ERROR
        })
        
        proceed.value = false
      end
    end
    
    
    #

    # Check if system modules loaded properly

    #

    if proceed.value == false
      #

      # Unload any loaded modules

      #

      system.stop
      
      return false
    end
    
    
    #

    # Setup the systems link

    #

    system.start  # Start the systems communicator

    return true
  ensure
    ActiveRecord::Base.clear_active_connections!  # Clear any unused connections

  end
end

.start_websockets ⇒ Object 



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# File 'lib/automate-em/interfaces/html5.rb', line 249

def self.start_websockets
  EM.schedule do
    if @@socket_server.nil?
      @@socket_server = EventMachine::WebSocket.start(:host => "0.0.0.0", :port => 81) do |socket| # , :debug => true

        socket.onopen {
          #

          # This socket represents a connected device

          #

          HTML5Monitor.register(socket)
        }
        
        socket.onmessage { |data|
          #

          # Attach socket here to system

          #  then process commands

          #

          HTML5Monitor.receive(socket, data)
        }
    
        socket.onclose {
          HTML5Monitor.unregister(socket)
        }
        
        socket.onerror { |error|
          if !error.kind_of?(EM::WebSocket::WebSocketError)
            EM.defer do
              AutomateEm.print_error(AutomateEm::System.logger, error, {
                :message => "in html5.rb, onerror : issue with websocket data",
                :level => Logger::ERROR
              })
            end
          else
            EM.defer do
              AutomateEm::System.logger.info "in html5.rb, onerror : invalid handshake received - #{error.inspect}"
            end
          end
        }
      end
    
    end
  end
  EM.defer do
    AutomateEm::System.logger.info 'running HTML5 socket server on port 81'
  end
end

.stop(system) ⇒ Object 



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# File 'lib/automate-em/core/system.rb', line 134

def self.stop(system)
  System[system].stop
end

.stop_websockets ⇒ Object 



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# File 'lib/automate-em/interfaces/html5.rb', line 295

def self.stop_websockets
  EM.schedule do
    EventMachine::stop_server(@@socket_server) unless @@socket_server.nil?
    @@socket_server = nil
  end
end

Instance Method Details

#[](mod) ⇒ Object

Module accessor



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# File 'lib/automate-em/core/system.rb', line 241

def [] (mod)
  mod = mod.to_sym if mod.class == String
  @modules[mod].instance
end

#instance ⇒ Object

For access via communicator



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

def instance
  self
end

#load(dbSetting, theClass) ⇒ Object

Loads a module into a system



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# File 'lib/automate-em/core/system.rb', line 255

def load(dbSetting, theClass)
  if dbSetting.is_a?(ControllerDevice)
    load_hooks(dbSetting, DeviceModule.new(self, dbSetting, theClass))
  elsif dbSetting.is_a?(ControllerHttpService)
    load_hooks(dbSetting, ServiceModule.new(self, dbSetting, theClass))
  else # ControllerLogic

    load_hooks(dbSetting, LogicModule.new(self, dbSetting, theClass))
  end
end

#log_level(level) ⇒ Object

Log level changing on the fly



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# File 'lib/automate-em/core/system.rb', line 314

def log_level(level)
  @sys_lock.synchronize {
    @log_level = AutomateEm::get_log_level(level)
    if @controller.active
      @logger.level = @log_level
    end
  }
end

#start ⇒ Object

The system is ready to go



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# File 'lib/automate-em/core/system.rb', line 268

def start
  @@god_lock.synchronize {
    @@controllers[@controller.id] = self
  }
  @communicator.start
end

#stop ⇒ Object

Stops the current control system Loops through the module instances.



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# File 'lib/automate-em/core/system.rb', line 279

def stop
  System.logger.info "stopping #{@controller.name}"
  @sys_lock.synchronize {
    if @controller.active
      @communicator.shutdown
      modules_unloaded = {}
      @modules.each_value do |mod|
        
        if modules_unloaded[mod] == nil
          modules_unloaded[mod] = :unloaded
          mod.unload
        end
        
      end
      @modules = {}  # Modules no longer referenced. Cleanup time!

      @logger.close if Rails.env.production?
      @logger = nil
    end
    
    @@god_lock.synchronize {
      @@controllers.delete(@controller.id)
      begin
        @controller.reload(:lock => true)
        @controller.active = false
      ensure
        @controller.save
      end
    }
  }
end