Class: Fluent::S3Output

Inherits:
TimeSlicedOutput
  • Object
show all
Includes:
Mixin::ConfigPlaceholders
Defined in:
lib/fluent/plugin/out_s3.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ S3Output

Returns a new instance of S3Output.



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# File 'lib/fluent/plugin/out_s3.rb', line 11

def initialize
  super
  require 'aws-sdk'
  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_s3.rb', line 38

def bucket
  @bucket
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 46

def configure(conf)
  super

  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 s3 output"
      end
    end
  end

  @ext, @mime_type = case @store_as
                     when 'gzip'
                       ['gz', 'application/x-gzip']
                     when 'lzo'
                       check_command('lzop', 'LZO')
                       @command_parameter = '-qf1' if @command_parameter.nil?
                       ['lzo', 'application/x-lzop']
                     when 'lzma2'
                       check_command('xz', 'LZMA2')
                       @command_parameter = '-qf0' if @command_parameter.nil?
                       ['xz', 'application/x-xz']
                     when 'json'
                       ['json', 'application/json']
                     else
                       ['txt', 'text/plain']
                     end

  if format_json = conf['format_json']
    $log.warn "format_json is deprecated. Use 'format json' instead"
    conf['format'] = 'json'
  else
    conf['format'] = @format
  end
  @formatter = TextFormatter.create(conf)

  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_s3.rb', line 115

def format(tag, time, record)
  @formatter.format(tag, time, record)
end

#placeholders ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 42

def placeholders
  [:percent]
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 96

def start
  super
  options = {}
  if @aws_key_id && @aws_sec_key
    options[:access_key_id] = @aws_key_id
    options[:secret_access_key] = @aws_sec_key
  end
  options[:region] = @s3_region if @s3_region
  options[:endpoint] = @s3_endpoint if @s3_endpoint
  options[:proxy_uri] = @proxy_uri if @proxy_uri
  options[:use_ssl] = @use_ssl

  @s3 = AWS::S3.new(options)
  @bucket = @s3.buckets[@s3_bucket]

  check_apikeys if @check_apikey_on_start
  ensure_bucket
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 119

def write(chunk)
  i = 0
  previous_path = nil

  begin
    s3path = Time.now.utc.strftime "#{@s3_object_key_format}.json.gz"

    if (i > 0) && (s3path == previous_path)
      raise "duplicated path is generated. use %{index} in s3_object_key_format: path = #{s3path}"
    end

    i += 1
    previous_path = s3path
  end while @bucket.objects[s3path].exists?

  tmp = Tempfile.new("s3-")
  begin
    if @store_as == "gzip"
      w = Zlib::GzipWriter.new(tmp)
      chunk.write_to(w)
      w.close
    elsif @store_as == "lzo"
      w = Tempfile.new("chunk-tmp")
      chunk.write_to(w)
      w.close
      tmp.close
      # We don't check the return code because we can't recover lzop failure.
      system "lzop #{@command_parameter} -o #{tmp.path} #{w.path}"
    elsif @store_as == "lzma2"
      w = Tempfile.new("chunk-xz-tmp")
      chunk.write_to(w)
      w.close
      tmp.close
      system "xz #{@command_parameter} -c #{w.path} > #{tmp.path}"
    else
      chunk.write_to(tmp)
      tmp.close
    end
    @bucket.objects[s3path].write(Pathname.new(tmp.path), {:content_type => @mime_type,
                                                           :reduced_redundancy => @reduced_redundancy})
  ensure
    tmp.close(true) rescue nil
    w.close rescue nil
    w.unlink rescue nil
  end
end