Class: Flydata::Output::TcpForwarder

Inherits:
Object
  • Object
show all
Defined in:
lib/flydata/command/sync.rb

Direct Known Subclasses

SslForwarder

Constant Summary collapse

FORWARD_HEADER = 
[0x92].pack('C')
BUFFER_SIZE =

32M

1024 * 1024 * 32
DEFUALT_SEND_TIMEOUT =

1 minute

60
RETRY_INTERVAL = 
2
RETRY_LIMIT = 
10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tag, servers, options = {}) ⇒ TcpForwarder

Returns a new instance of TcpForwarder.



342
343
344
345
346
347
348
349
350
351
 
# File 'lib/flydata/command/sync.rb', line 342

def initialize(tag, servers, options = {})
  @tag = tag
  unless servers and servers.kind_of?(Array) and not servers.empty?
    raise "Servers must not be empty."
  end
  @servers = servers
  @server_index = 0
  set_options(options)
  reset
end

Instance Attribute Details

#buffer_record_count ⇒ Object (readonly)

Returns the value of attribute buffer_record_count.



361
362
363
 
# File 'lib/flydata/command/sync.rb', line 361

def buffer_record_count
  @buffer_record_count
end

#buffer_size ⇒ Object (readonly)

Returns the value of attribute buffer_size.



361
362
363
 
# File 'lib/flydata/command/sync.rb', line 361

def buffer_size
  @buffer_size
end

Instance Method Details

#close ⇒ Object 



456
457
458
 
# File 'lib/flydata/command/sync.rb', line 456

def close
  flush
end

#connect(server) ⇒ Object 



433
434
435
436
437
438
439
440
441
442
443
444
 
# File 'lib/flydata/command/sync.rb', line 433

def connect(server)
  host, port = server.split(':')
  sock = TCPSocket.new(host, port.to_i)

  # Set options
  opt = [1, DEFUALT_SEND_TIMEOUT].pack('I!I!')
  sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_LINGER, opt)
  opt = [DEFUALT_SEND_TIMEOUT, 0].pack('L!L!')
  sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_SNDTIMEO, opt)

  sock
end

#emit(records, time = Time.now.to_i) ⇒ Object 



363
364
365
366
367
368
369
370
371
372
373
374
375
376
 
# File 'lib/flydata/command/sync.rb', line 363

def emit(records, time = Time.now.to_i)
  records = [records] unless records.kind_of?(Array)
  records.each do |record|
    event_data = [time,record].to_msgpack
    @buffer_records << event_data
    @buffer_record_count += 1
    @buffer_size += event_data.bytesize
  end
  if @buffer_size > @buffer_size_limit
    send
  else
    false
  end
end

#flush ⇒ Object 



452
453
454
 
# File 'lib/flydata/command/sync.rb', line 452

def flush
  send
end

#pickup_server ⇒ Object

TODO: Check server status



424
425
426
427
428
429
430
431
 
# File 'lib/flydata/command/sync.rb', line 424

def pickup_server
  ret_server = @servers[@server_index]
  @server_index += 1
  if @server_index >= (@servers.count)
    @server_index = 0
  end
  ret_server
end

#reset ⇒ Object 



446
447
448
449
450
 
# File 'lib/flydata/command/sync.rb', line 446

def reset
  @buffer_records = ''
  @buffer_record_count = 0
  @buffer_size = 0
end

#send ⇒ Object

TODO retry logic



379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
 
# File 'lib/flydata/command/sync.rb', line 379

def send
  if @buffer_size > 0
    puts "  -> Sending #{@buffer_record_count}records #{@buffer_size}byte"
  else
    return false
  end
  if ENV['FLYDATA_BENCHMARK']
    reset
    return true
  end
  sock = nil
  retry_count = 0
  begin
    sock = connect(pickup_server)

    # Write header
    sock.write FORWARD_HEADER
    # Write tag
    sock.write @tag.to_msgpack
    # Write records
    sock.write [0xdb, @buffer_records.bytesize].pack('CN')
    StringIO.open(@buffer_records) do |i|
      FileUtils.copy_stream(i, sock)
    end
  rescue => e
    retry_count += 1
    if retry_count > RETRY_LIMIT
      puts "! Error: Failed to send data. Exceeded the retry limit. retry_count:#{retry_count}"
      raise e
    end
    puts "! Warn: Retring to send data. retry_count:#{retry_count} error=#{e.to_s}"
    wait_time = RETRY_INTERVAL ** retry_count
    puts "  Now waiting for next retry. time=#{wait_time}sec"
    sleep wait_time
    retry
  ensure
    if sock
      sock.close rescue nil
    end
  end
  reset
  true
end

#set_options(options) ⇒ Object 



353
354
355
356
357
358
359
 
# File 'lib/flydata/command/sync.rb', line 353

def set_options(options)
  if options[:buffer_size_limit]
    @buffer_size_limit = options[:buffer_size_limit]
  else
    @buffer_size_limit = BUFFER_SIZE
  end
end