Class: Bluepill::Controller

Inherits:
Object
  • Object
show all
Defined in:
lib/bluepill/controller.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Controller

Returns a new instance of Controller.



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# File 'lib/bluepill/controller.rb', line 7

def initialize(options = {})
  self.log_file = options[:log_file]
  self.base_dir = options[:base_dir]
  self.sockets_dir = File.join(base_dir, 'socks')
  self.pids_dir = File.join(base_dir, 'pids')
  
  setup_dir_structure
  cleanup_bluepill_directory
end

Instance Attribute Details

#base_dir ⇒ Object

Returns the value of attribute base_dir.



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# File 'lib/bluepill/controller.rb', line 5

def base_dir
  @base_dir
end

#log_file ⇒ Object

Returns the value of attribute log_file.



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# File 'lib/bluepill/controller.rb', line 5

def log_file
  @log_file
end

#pids_dir ⇒ Object

Returns the value of attribute pids_dir.



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# File 'lib/bluepill/controller.rb', line 5

def pids_dir
  @pids_dir
end

#sockets_dir ⇒ Object

Returns the value of attribute sockets_dir.



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# File 'lib/bluepill/controller.rb', line 5

def sockets_dir
  @sockets_dir
end

Instance Method Details

#grep_pattern(application, query = nil) ⇒ Object 



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# File 'lib/bluepill/controller.rb', line 90

def grep_pattern(application, query = nil)
  pattern = [application, query].compact.join(':')
  ['\[.*', Regexp.escape(pattern), '.*'].compact.join
end

#handle_command(application, command, *args) ⇒ Object 



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# File 'lib/bluepill/controller.rb', line 21

def handle_command(application, command, *args)
  case command.to_sym
  when :status
    puts self.send_to_daemon(application, :status, *args)
  when *Application::PROCESS_COMMANDS
    # these need to be sent to the daemon and the results printed out
    affected = self.send_to_daemon(application, command, *args)
    if affected.empty?
      puts "No processes effected"
    else
      puts "Sent #{command} to:"
      affected.each do |process|
        puts "  #{process}"
      end
    end
  when :quit
    pid = pid_for(application)
    if System.pid_alive?(pid)
      ::Process.kill("TERM", pid)
      puts "Killing bluepilld[#{pid}]"
    else
      puts "bluepilld[#{pid}] not running"
    end
  when :log
    log_file_location = self.send_to_daemon(application, :log_file)
    log_file_location = self.log_file if log_file_location.to_s.strip.empty?
    
    requested_pattern = args.first
    grep_pattern = self.grep_pattern(application, requested_pattern)
    
    tail = "tail -n 100 -f #{log_file_location} | grep -E '#{grep_pattern}'"
    puts "Tailing log for #{requested_pattern}..."
    Kernel.exec(tail)
  else
    $stderr.puts "Unknown command `%s` (or application `%s` has not been loaded yet)" % [command, command]
  end
end

#running_applications ⇒ Object 



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# File 'lib/bluepill/controller.rb', line 17

def running_applications
  Dir[File.join(sockets_dir, "*.sock")].map{|x| File.basename(x, ".sock")}
end

#send_to_daemon(application, command, *args) ⇒ Object 



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# File 'lib/bluepill/controller.rb', line 59

def send_to_daemon(application, command, *args)
  begin
    Timeout::timeout(Socket::TIMEOUT) do
      verify_version!(application)
      buffer = ""
      socket = Socket.client(base_dir, application) # Something that should be interrupted if it takes too much time...
      socket.puts(([command] + args).join(":"))
      while line = socket.gets
        buffer << line
      end
      if buffer.size > 0
        response = Marshal.load(buffer)
        if response.is_a?(Exception)
          $stderr.puts "Received error from server:"
          $stderr.puts response.inspect
          $stderr.puts response.backtrace.join("\n")
          exit(8)
        else
          response
        end
      else
        abort("No response from server")
      end
    end
  rescue Timeout::Error
    abort("Socket Timeout: Server may not be responding")
  rescue Errno::ECONNREFUSED
    abort("Connection Refused: Server is not running")
  end
end