Fluent logger

A structured event logger

Examples

Simple

require 'fluent-logger'

log = Fluent::Logger::FluentLogger.new(nil, :host=>'localhost', :port=>24224)
unless log.post("myapp.access", {"agent"=>"foo"})
  p log.last_error # You can get last error object via last_error method
end

# output: myapp.access {"agent":"foo"}

Singleton

require 'fluent-logger'

Fluent::Logger::FluentLogger.open(nil, :host=>'localhost', :port=>24224)
Fluent::Logger.post("myapp.access", {"agent"=>"foo"})

# output: myapp.access {"agent":"foo"}

Tag prefix

require 'fluent-logger'

log = Fluent::Logger::FluentLogger.new('myapp', :host=>'localhost', :port=>24224)
log.post("access", {"agent"=>"foo"})

# output: myapp.access {"agent":"foo"}

Loggers

Fluent

Fluent::Logger::FluentLogger.open('tag_prefix', :host=>'localhost', :port=>24224)

Console

Fluent::Logger::ConsoleLogger.open(io)

Null

Fluent::Logger::NullLogger.open

Buffer overflow

You can inject your own custom proc to handle buffer overflow in the event of connection failure. This will mitigate the loss of data instead of simply throwing data away.

Your proc must accept a single argument, which will be the internal buffer of messages from the logger. A typical use-case for this would be writing to disk or possibly writing to Redis.

Example

class BufferOverflowHandler
  attr_accessor :buffer

  def flush(messages)
    @buffer ||= []
    MessagePack::Unpacker.new.feed_each(messages) do |msg|
      @buffer << msg
    end
  end
end

handler = Proc.new { |messages| BufferOverflowHandler.new.flush(messages) }

Fluent::Logger::FluentLogger.new(nil,
  :host => 'localhost', :port => 24224,
  :buffer_overflow_handler => handler)

name	description
Web site	http://fluentd.org/
Documents	http://docs.fluentd.org/
Source repository	https://github.com/fluent/fluent-logger-ruby
Author	Sadayuki Furuhashi
Copyright	(c) 2011 FURUHASHI Sadayuki
License	Apache License, Version 2.0