Class: Fluent::DagOutput

Inherits:
TimeSlicedOutput
  • Object
show all
Includes:
Mixin::ConfigPlaceholders, SetTagKeyMixin
Defined in:
lib/fluent/plugin/out_dag.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DagOutput

Returns a new instance of DagOutput.



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# File 'lib/fluent/plugin/out_dag.rb', line 12

def initialize
  super
  require 'aws-sdk-v1'
  require 'zlib'
  require 'time'
  require 'tempfile'
  require 'open3'

  @use_ssl = true
end

Instance Attribute Details

#bucket ⇒ Object (readonly)

Returns the value of attribute bucket.



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# File 'lib/fluent/plugin/out_dag.rb', line 41

def bucket
  @bucket
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_dag.rb', line 49

def configure(conf)
  super

  unless conf['flush_interval'].nil?
    unless valid_flush_interval?(conf['flush_interval'])
      raise "flush_interval is invalid. Please check your configuration"
    end
  end

  unless valid_dag_database?(conf['dag_database'])
    raise "dag_database is invalid. Please check your configuration"
  end

  unless valid_dag_table?(conf['dag_table'])
    raise "dag_table is invalid. Please check your configuration"
  end

  @path = "#{@dag_table}/date=%Y%m%d/hour=%-H/dag_%-M"
  @dag_object_key_format = "%{path}_%{index}.%{file_extension}"

  if use_ssl = conf['use_ssl']
    if use_ssl.empty?
      @use_ssl = true
    else
      @use_ssl = Config.bool_value(use_ssl)
      if @use_ssl.nil?
        raise ConfigError, "'true' or 'false' is required for use_ssl option on dag output"
      end
    end
  end

  @ext, @mime_type = ['gz', 'application/x-gzip']
  @timef = TimeFormatter.new(@time_format, @localtime)

  if @localtime
    @path_slicer = Proc.new {|path|
      Time.now.strftime(path)
    }
  else
    @path_slicer = Proc.new {|path|
      Time.now.utc.strftime(path)
    }
  end

end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_dag.rb', line 114

def format(tag, time, record)
  # copied from each mixin because current TimeSlicedOutput can't support mixins.
  if @include_tag_key
    record[@tag_key] = tag
  end

  dag_record = {}
  dag_record[:time] = time
  dag_record[:v] = record
  Yajl.dump(dag_record) + "\n"
end

#placeholders ⇒ Object 



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# File 'lib/fluent/plugin/out_dag.rb', line 45

def placeholders
  [:percent]
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_dag.rb', line 95

def start
  super
  options = {}
  if @dag_key_id && @dag_sec_key
    options[:access_key_id] = @dag_key_id
    options[:secret_access_key] = @dag_sec_key
  end
  options[:s3_endpoint] = @dag_endpoint
  options[:proxy_uri] = @proxy_uri if @proxy_uri
  options[:use_ssl] = @use_ssl
  options[:s3_force_path_style] = @dag_force_path_style

  @dag = AWS::S3.new(options)
  @bucket = @dag.buckets[@dag_database]

  ensure_bucket
  check_apikeys if @check_apikey_on_start
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_dag.rb', line 126

def write(chunk)
  i = 0

  begin
    path = @path_slicer.call(@path)
    values_for_dag_object_key = {
      "path" => path,
      "time_slice" => chunk.key,
      "file_extension" => @ext,
      "index" => i
    }
    dag_path = @dag_object_key_format.gsub(%r(%{[^}]+})) { |expr|
      values_for_dag_object_key[expr[2...expr.size-1]]
    }
    i += 1
  end while @bucket.objects[dag_path].exists?

  tmp = Tempfile.new("dag-")
  begin
    w = Zlib::GzipWriter.new(tmp)
    chunk.write_to(w)
    w.close
    @bucket.objects[dag_path].write(Pathname.new(tmp.path), {:content_type => @mime_type})
  ensure
    tmp.close(true) rescue nil
    w.close rescue nil
    w.unlink rescue nil
  end
end