Class: DIY::Controller

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

Instance Method Summary collapse

Constructor Details

#initialize(client, server, offline, strategy) ⇒ Controller

Returns a new instance of Controller.



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# File 'lib/diy/controller.rb', line 6

def initialize( client, server, offline, strategy)
  @client = client
  @server = server
  @offline = offline
  @strategy = strategy
  @before_send = nil
  @timeout = nil
  @error_on_stop = nil
  @fail_count = 0
end

Instance Method Details

#before_send(&block) ⇒ Object 



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# File 'lib/diy/controller.rb', line 152

def before_send(&block)
  @before_send = block
end

#before_send_call(pkts, client_flag) ⇒ Object 



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# File 'lib/diy/controller.rb', line 135

def before_send_call(pkts, client_flag)
  return unless @before_send
  pkts.delete_if do |pkt|
    begin
      ret = @before_send.call( pkt, client_flag )
    rescue Exception => e
      DIY::Logger.warn("UserError Catch: " + error = BeforeSendCallError.new(e) )
      error.backtrace.each do |msg|
        DIY::Logger.info(msg)
      end
      raise error
    end
    ! ret
  end
  pkts
end

#client_send(client, pkts) ⇒ Object 



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# File 'lib/diy/controller.rb', line 126

def client_send(client, pkts)
  begin
    client.inject(pkts)
  rescue FFI::PCap::LibError =>e
    DIY::Logger.info("SendPacketError Catch: " + e )
    raise e
  end
end

#do_trap ⇒ Object 



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# File 'lib/diy/controller.rb', line 72

def do_trap
  Signal.trap("INT") do
    DIY::Logger.info "bye.."
    stop
    exit 0
  end    
end

#error_on_stop ⇒ Object 



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# File 'lib/diy/controller.rb', line 160

def error_on_stop(*)
  @error_on_stop = true
end

#offline_result ⇒ Object 



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# File 'lib/diy/controller.rb', line 169

def offline_result
  sprintf "%4d files, running %8d packets", @offline.files_size, @offline.now_size
end

#one_round(client, server, pkts) ⇒ Object 



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# File 'lib/diy/controller.rb', line 85

def one_round( client, server, pkts )
  @error_flag = nil
  @round_count = 0 unless @round_count
  @round_count += 1
  DIY::Logger.info "round #{@round_count}: (c:#{client.__drburi} / s:#{server.__drburi}) #{pkts[0].pretty_print}:(queue= #{pkts.size})"
  
  # check is client or server at this time
  # give the flag to **before_send** block
  client_or_server = client == @client
  
  before_send_call(pkts, client_or_server)
  
  recv_pkt_proc_set( pkts )
  @ready = false
  server.ready(&@recv_pkt_proc)
  @ready = true
  client_send(client, pkts)
  wait_recv_ok(pkts)
  server.terminal
end

#recv_pkt_proc_set(queue) ⇒ Object

设置回调入口, 由 worker 通过DRb 远程调用



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# File 'lib/diy/controller.rb', line 107

def recv_pkt_proc_set(queue)
  @queue_keeper = queue
  # 不重新赋值, 防止 DRb 回收
  @recv_pkt_proc ||= lambda do |recv_pkt|
    begin
      next unless @ready # strip this recv pkt unless it's ready to.
      next if @error_flag # error accur waiting other thread do with it
      @recv_pkt_keeper = Packet.new(recv_pkt)
      @strategy.call(@queue_keeper.first, @recv_pkt_keeper, @queue_keeper)
    rescue DIY::UserError =>e
      DIY::Logger.warn("UserError Catch: " + e.inspect)
      e.backtrace.each do |msg|
        DIY::Logger.info(msg)
      end
      @error_flag = e
    end        
  end
end

#run ⇒ Object 



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

def run
  do_trap
  client = @client
  server = @server
  
  @fail_count = 0
  start_time = Time.now
  #clear
  client.terminal
  server.terminal
  
  loop do
    begin
      pkts, where = @offline.nexts
      case where
      when :A
        client, server = @client, @server
      when :B
        client, server = @server, @client
      end
      one_round( client, server, pkts )
    rescue HopePacketTimeoutError, UserError, FFI::PCap::LibError => e
      DIY::Logger.warn( "Timeout: Hope packet is #{pkts[0].pretty_print} ") if e.kind_of?(HopePacketTimeoutError)
      @fail_count += 1
      if @error_on_stop and e.kind_of?(HopePacketTimeoutError)
        client.terminal
        server.terminal
        DIY::Logger.info "Error_on_stop flag opened, stopping..."
        DIY::Logger.info "Dump mac learn table(size is #{@offline.mac_learner.size})... "
        DIY::Logger.info @offline.mac_learner.dump
        break
      end
      begin
        @offline.next_pcap
        client.terminal
        server.terminal
      rescue EOFError
        client.terminal
        server.terminal
        break
      end
      #~ client,server = @client, @server
    rescue EOFError
      client.terminal
      server.terminal
      break
    ensure
      #~ client, server = server, client
    end
  end
  DRb.stop_service
  end_time = Time.now
  stats_result( end_time - start_time, @fail_count )
end

#stats_result(cost_time, fail_count) ⇒ Object 



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# File 'lib/diy/controller.rb', line 164

def stats_result( cost_time, fail_count )
  DIY::Logger.info " Finished in #{cost_time} seconds"
  DIY::Logger.info " #{offline_result}, #{fail_count} failures"
end

#stop ⇒ Object 



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# File 'lib/diy/controller.rb', line 80

def stop
  @client.terminal
  @server.terminal
end

#timeout(timeout) ⇒ Object 



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# File 'lib/diy/controller.rb', line 156

def timeout(timeout)
  @timeout = timeout
end

#wait_recv_ok(pkts) ⇒ Object 



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# File 'lib/diy/controller.rb', line 173

def wait_recv_ok(pkts)
  @timeout ||= 10
  tick = 0
  until pkts.empty? do
    now_size = pkts.size
    raise @error_flag if @error_flag
    tick += 0.01
    sleep 0.01
    if pkts.size < now_size
      # clear tick time if at least one packet has passed the judgement of stratgies.
      tick = 0
    end
    raise DIY::HopePacketTimeoutError.new("hope packet wait timeout after #{@timeout} seconds") if !pkts.empty? && tick >= @timeout
  end
end