Class: Adminix::Watcher

Inherits:
Object
  • Object
show all
Defined in:
lib/adminix/watcher.rb

Constant Summary collapse

SERVICE_CHANNEL = 
'ServiceChannel'.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ Watcher

Returns a new instance of Watcher.



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# File 'lib/adminix/watcher.rb', line 18

def initialize(opts)
  @sync_period = config.watcher_sync_period
  @pid_full = '/tmp/adminix.pid'
  @service = Service.instance
  
  @ws_client = nil
  @ws_uri = "#{config.websocket_path}?secret_key=#{config.secret_key}"
  @ws_channel = { channel: 'ServiceChannel', service_id: @service.id }
  @ws_logs_channel = { channel: 'LogsChannel', service_id: @service.id }

  @watching_files = []

  if EM.epoll?
    EM.epoll
  elsif EM.kqueue?
    EM.kqueue
  else
    Kernel.warn('Neither epoll nor kqueue are supported.')
  end
end

Class Method Details

.run!(options) ⇒ Object 



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# File 'lib/adminix/watcher.rb', line 6

def self.run!(options)
  watcher = Watcher.new(options)

  if options[:stop_daemon]
    watcher.stop
  else
    options[:daemonize] ? watcher.start : watcher.run!
  end
end

Instance Method Details

#get_pid ⇒ Object 



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# File 'lib/adminix/watcher.rb', line 89

def get_pid
  if File.exists?(@pid_full)
    file = File.new(@pid_full, "r")
    pid = file.read
    file.close

    pid
  else
    0
  end
end

#run! ⇒ Object 



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# File 'lib/adminix/watcher.rb', line 39

def run!
  trap_signal

  Adminix::Service.instance.count_logs_lines

  EventMachine.run do
    @ws_client = ActionCableClient.new(@ws_uri, @ws_channel)
    @ws_client.connected do |msg|
      puts 'Service connection established'
    end
    @ws_client.disconnected do
      system.log 'Service disconnected. Reconnecting...'
      sleep(2)
      @ws_client.connect!
    end
    @ws_client.received do |msg|
      message = msg['message'] || {}
      case message['type']
        when 'restart' then @service.restart!
        when 'sync' then @service.sync(@ws_client, message['data'])
      end
    end

    @ws_logs_client = ActionCableClient.new(@ws_uri, @ws_logs_channel)
    @ws_logs_client.connected do |msg|
      puts 'Logs connection established'
    end
    @ws_logs_client.disconnected do
      system.log 'Logs disconnected. Reconnecting...'
      sleep(2)
      @ws_logs_client.connect!
    end
    @ws_logs_client.received { |msg| }

    # Sync watcher
    EventMachine.add_periodic_timer(config.watcher_sync_period) do
      @ws_client.perform(:sync, @service.to_cable) if @ws_client.subscribed?
    end

    # Logs watcher
    config.watch_log_files.each do |file_path|
      EventMachine.watch_file(file_path, Adminix::LogWatchHandler)
    end

    EventMachine.add_periodic_timer(config.logs_sync_period) do
      Adminix::Service.instance.sync_logs(@ws_logs_client)
    end
  end
end

#start ⇒ Object 



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# File 'lib/adminix/watcher.rb', line 101

def start
  pid = get_pid
  if pid != 0
    warn "Daemon is already running"
    exit -1
  end

  pid = fork {
    run!
  }
  begin
    file = File.new(@pid_full, "w")
    file.write(pid)
    file.close
    Process.detach(pid)
  rescue => exc
    Process.kill('TERM', pid)
    warn "Cannot start daemon: #{exc.message}"
  end
end

#stop ⇒ Object 



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# File 'lib/adminix/watcher.rb', line 122

def stop
  pid = get_pid
  begin
    EM.stop
  rescue
  end

  if pid != 0
    Process.kill('HUP', pid.to_i)
    File.delete(@pid_full)
    system.log "Stopped"
  else
    warn "Daemon is not running"
    exit -1
  end
end