Class: Packet::Reactor

Inherits:
Object
  • Object
show all
Includes:
Core
Defined in:
lib/packet/packet_master.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Core

included

Instance Attribute Details

#fd_writers ⇒ Object

set_thread_pool_size(20)



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# File 'lib/packet/packet_master.rb', line 5

def fd_writers
  @fd_writers
end

#live_workers ⇒ Object

Returns the value of attribute live_workers.



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# File 'lib/packet/packet_master.rb', line 8

def live_workers
  @live_workers
end

#msg_reader ⇒ Object

set_thread_pool_size(20)



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# File 'lib/packet/packet_master.rb', line 5

def msg_reader
  @msg_reader
end

#msg_writers ⇒ Object

set_thread_pool_size(20)



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# File 'lib/packet/packet_master.rb', line 5

def msg_writers
  @msg_writers
end

#result_hash ⇒ Object

Returns the value of attribute result_hash.



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# File 'lib/packet/packet_master.rb', line 6

def result_hash
  @result_hash
end

Class Method Details

.run {|master_reactor_instance| ... } ⇒ Object

Yields:

  • (master_reactor_instance) 


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# File 'lib/packet/packet_master.rb', line 15

def self.run
  master_reactor_instance = new
  master_reactor_instance.result_hash = {}
  master_reactor_instance.live_workers = DoubleKeyedHash.new
  yield(master_reactor_instance)
  master_reactor_instance.load_workers
  master_reactor_instance.start_reactor
end

.server_logger=(log_file_name) ⇒ Object

after_connection :provide_workers



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# File 'lib/packet/packet_master.rb', line 11

def self.server_logger= (log_file_name)
  @@server_logger = log_file_name
end

Instance Method Details

#delete_worker(worker_options = {}) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 51

def delete_worker(worker_options = {})
  worker_name = worker_options[:worker]
  worker_name_key = gen_worker_key(worker_name,worker_options[:worker_key])
  worker_options[:method] = :exit
  @live_workers[worker_name_key].send_request(worker_options)
end

#enable_nonblock(io) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 87

def enable_nonblock io
  f = io.fcntl(Fcntl::F_GETFL,0)
  io.fcntl(Fcntl::F_SETFL,Fcntl::O_NONBLOCK | f)
end

#fork_and_load(worker_klass, worker_options = { }) ⇒ Object

method should use worker_key if provided in options hash.



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# File 'lib/packet/packet_master.rb', line 93

def fork_and_load(worker_klass,worker_options = { })
  t_worker_name = worker_klass.worker_name
  worker_pimp = worker_klass.worker_proxy.to_s

  # socket from which master process is going to read
  master_read_end,worker_write_end = UNIXSocket.pair(Socket::SOCK_STREAM)
  # socket to which master process is going to write
  worker_read_end,master_write_end = UNIXSocket.pair(Socket::SOCK_STREAM)

  option_dump = Marshal.dump(worker_options)
  option_dump_length = option_dump.length
  master_write_end.write(option_dump)
  worker_name_key = gen_worker_key(t_worker_name,worker_options[:worker_key])

  if(!(pid = fork))
    [master_write_end,master_read_end].each { |x| x.close }
    [worker_read_end,worker_write_end].each { |x| enable_nonblock(x) }
    begin
      if(ARGV[0] == 'start' && Object.const_defined?(:SERVER_LOGGER))
        redirect_io(SERVER_LOGGER)
      end
    rescue
      puts $!.backtrace
    end
    exec form_cmd_line(worker_read_end.fileno,worker_write_end.fileno,t_worker_name,option_dump_length)
  end
  Process.detach(pid)
  [master_read_end,master_write_end].each { |x| enable_nonblock(x) }

  if worker_pimp && !worker_pimp.empty?
    require worker_pimp
    pimp_klass = Object.const_get(packet_classify(worker_pimp))
    @live_workers[worker_name_key,master_read_end.fileno] = pimp_klass.new(master_write_end,pid,self)
  else
    t_pimp = Packet::MetaPimp.new(master_write_end,pid,self)
    t_pimp.worker_key = worker_name_key
    t_pimp.worker_name = t_worker_name
    t_pimp.invokable_worker_methods = worker_klass.instance_methods
    @live_workers[worker_name_key,master_read_end.fileno] = t_pimp
  end

  worker_read_end.close
  worker_write_end.close
  read_ios << master_read_end
end

#form_cmd_line(*args) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 160

def form_cmd_line *args
  min_string = "packet_worker_runner #{args[0]}:#{args[1]}:#{args[2]}:#{args[3]}"
  min_string << ":#{WORKER_ROOT}" if defined? WORKER_ROOT
  min_string << ":#{WORKER_LOAD_ENV}" if defined? WORKER_LOAD_ENV
  min_string
end

#handle_internal_messages(t_sock) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 33

def handle_internal_messages(t_sock)
  sock_fd = t_sock.fileno
  worker_instance = @live_workers[sock_fd]
  begin
    raw_data = read_data(t_sock)
    worker_instance.receive_data(raw_data) if worker_instance.respond_to?(:receive_data)
  rescue DisconnectError => sock_error
    worker_instance.receive_data(sock_error.data) if worker_instance.respond_to?(:receive_data)
    remove_worker(t_sock)
  end
end

#load_workers ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 58

def load_workers
  worker_root = defined?(WORKER_ROOT) ? WORKER_ROOT : "#{PACKET_APP}/worker"

  t_workers = Dir["#{worker_root}/**/*.rb"]
  return if t_workers.empty?
  t_workers.each do |b_worker|
    worker_name = File.basename(b_worker,".rb")
    require worker_name
    worker_klass = Object.const_get(packet_classify(worker_name))
    next if worker_klass.no_auto_load
    fork_and_load(worker_klass)
  end
end

#redirect_io(logfile_name) ⇒ Object

Free file descriptors and point them somewhere sensible STDOUT/STDERR should go to a logfile



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# File 'lib/packet/packet_master.rb', line 142

def redirect_io(logfile_name)
  begin; STDIN.reopen "/dev/null"; rescue ::Exception; end

  if logfile_name
    begin
      STDOUT.reopen logfile_name, "a"
      STDOUT.sync = true
    rescue ::Exception
      begin; STDOUT.reopen "/dev/null"; rescue ::Exception; end
    end
  else
    begin; STDOUT.reopen "/dev/null"; rescue ::Exception; end
  end

  begin; STDERR.reopen STDOUT; rescue ::Exception; end
  STDERR.sync = true
end

#remove_worker(t_sock) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 46

def remove_worker(t_sock)
  @live_workers.delete(t_sock.fileno)
  read_ios.delete(t_sock)
end

#set_result_hash(hash) ⇒ Object

end of run method



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# File 'lib/packet/packet_master.rb', line 24

def set_result_hash(hash)
  @result_hash = hash
end

#start_worker(worker_options = { }) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 72

def start_worker(worker_options = { })
  worker_name = worker_options[:worker].to_s
  worker_name_key = gen_worker_key(worker_name,worker_options[:worker_key])
  return if @live_workers[worker_name_key]
  worker_options.delete(:worker)
  begin
    require worker_name
    worker_klass = Object.const_get(packet_classify(worker_name))
    fork_and_load(worker_klass,worker_options)
  rescue LoadError
    puts "no such worker #{worker_name}"
    return
  end
end

#update_result(worker_key, result) ⇒ Object 



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# File 'lib/packet/packet_master.rb', line 28

def update_result(worker_key,result)
  @result_hash ||= {}
  @result_hash[worker_key.to_sym] = result
end