Class: Fluent::Logger::FluentLogger

Inherits:
LoggerBase show all
Extended by:
Finalizable
Defined in:
lib/fluent/logger/fluent_logger.rb,
lib/fluent/logger/fluent_logger/cui.rb

Defined Under Namespace

Modules: CUI, Finalizable

Constant Summary collapse

BUFFER_LIMIT = 
8*1024*1024
RECONNECT_WAIT = 
0.5
RECONNECT_WAIT_INCR_RATE = 
1.5
RECONNECT_WAIT_MAX = 
60
RECONNECT_WAIT_MAX_COUNT = 
(1..100).inject(RECONNECT_WAIT_MAX / RECONNECT_WAIT) {|r,i|
  break i + 1 if r < RECONNECT_WAIT_INCR_RATE
  r / RECONNECT_WAIT_INCR_RATE
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Finalizable

finalizer, new

Methods inherited from LoggerBase

open, #post

Constructor Details

#initialize(tag_prefix, *args) ⇒ FluentLogger

Returns a new instance of FluentLogger.



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# File 'lib/fluent/logger/fluent_logger.rb', line 58

def initialize(tag_prefix, *args)
  super()

  options = {
    :host => 'localhost',
    :port => 24224
  }

  case args.first
  when String, Symbol
    # backward compatible
    options[:host] = args[0]
    options[:port] = args[1] if args[1]
  when Hash
    options.update args.first
  end

  @tag_prefix = tag_prefix
  @host = options[:host]
  @port = options[:port]

  @mon = Monitor.new
  @pending = nil
  @connect_error_history = []

  @limit = options[:buffer_limit] || BUFFER_LIMIT
  @log_reconnect_error_threshold = options[:log_reconnect_error_threshold] ||  RECONNECT_WAIT_MAX_COUNT

  if logger = options[:logger]
    @logger = logger
  else
    @logger = ::Logger.new(STDERR)
    if options[:debug]
      @logger.level = ::Logger::DEBUG
    else
      @logger.level = ::Logger::INFO
    end
  end

  @last_error = {}

  begin
    connect!
  rescue => e
    set_last_error(e)
    @logger.error "Failed to connect fluentd: #{$!}"
    @logger.error "Connection will be retried."
  end
end

Instance Attribute Details

#last_error ⇒ Object (readonly)

Returns the value of attribute last_error.



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# File 'lib/fluent/logger/fluent_logger.rb', line 109

def last_error
  @last_error
end

#limit ⇒ Object

Returns the value of attribute limit.



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# File 'lib/fluent/logger/fluent_logger.rb', line 108

def limit
  @limit
end

#log_reconnect_error_threshold ⇒ Object

Returns the value of attribute log_reconnect_error_threshold.



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# File 'lib/fluent/logger/fluent_logger.rb', line 108

def log_reconnect_error_threshold
  @log_reconnect_error_threshold
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/fluent/logger/fluent_logger.rb', line 108

def logger
  @logger
end

Instance Method Details

#batch_post_with_time(messages) ⇒ Object 



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# File 'lib/fluent/logger/fluent_logger.rb', line 120

def batch_post_with_time(messages)
  # convert each message
  # batch send
  # if batch > byte max, send in multiple requests
  #
  # how to handle errors? immediate fail batch, or skip bad messageS?

  # what if pending is not null here? if we check needs to be syncronized

  # Reorder since #post_with_time takes a different order than #write
  # NOTE Should we mangle the time? It should be .to_i here
  payloads = messages.map do |msg| 
    prepare_msg prepare_post_with_time_arguments(*msg)
  end

  # Check for 'false' payloads, those are errors, and last message will be set.

  payload = ""

  payloads.each do |data|
    if (payload.bytesize + data.bytesize) > @limit
      raw_write payload
      payload = ""
    end

    payload << data
  end

  raw_write payload if payload.bytesize > 0
end

#close ⇒ Object 



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# File 'lib/fluent/logger/fluent_logger.rb', line 151

def close
  @mon.synchronize {
    if @pending
      begin
        send_data(@pending)
      rescue => e
        set_last_error(e)
        @logger.error("FluentLogger: Can't send logs to #{@host}:#{@port}: #{$!}")
      end
    end
    @con.close if connect?
    @con = nil
    @pending = nil
  }
  self
end

#connect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/logger/fluent_logger.rb', line 168

def connect?
  !!@con
end

#finalize ⇒ Object 



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# File 'lib/fluent/logger/fluent_logger.rb', line 172

def finalize
  close
end

#post_with_time(tag, map, time) ⇒ Object 



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# File 'lib/fluent/logger/fluent_logger.rb', line 115

def post_with_time(tag, map, time)
  @logger.debug { "event: #{tag} #{map.to_json}" rescue nil }
  write prepare_post_with_time_arguments(tag, map, time)
end