Class: Fluent::S3Output

Inherits:
TimeSlicedOutput
  • Object
show all
Includes:
Mixin::ConfigPlaceholders, SetTagKeyMixin, SetTimeKeyMixin
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 8

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 format_json = conf['format_json']
    @format_json = true
  else
    @format_json = false
  end

  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' then ['gz', 'application/x-gzip']
    when 'lzo' then
      begin
        Open3.capture3('lzop -V')
      rescue Errno::ENOENT
        raise ConfigError, "'lzop' utility must be in PATH for LZO compression"
      end
      ['lzo', 'application/x-lzop']
    when 'json' then ['json', 'application/json']
    else ['txt', 'text/plain']
  end

  @timef = TimeFormatter.new(@time_format, @localtime)
end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 100

def format(tag, time, record)
  if @include_time_key || !@format_json
    time_str = @timef.format(time)
  end

  # copied from each mixin because current TimeSlicedOutput can't support mixins.
  if @include_tag_key
    record[@tag_key] = tag
  end
  if @include_time_key
    record[@time_key] = time_str
  end

  if @format_json
    Yajl.dump(record) + "\n"
  else
    "#{time_str}\t#{tag}\t#{Yajl.dump(record)}\n"
  end
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 82

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[:s3_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]

  ensure_bucket
  check_apikeys if @check_apikey_on_start
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_s3.rb', line 120

def write(chunk)
  i = 0

  begin
    values_for_s3_object_key = {
      "path" => @path,
      "time_slice" => chunk.key,
      "file_extension" => @ext,
      "index" => i
    }
    s3path = @s3_object_key_format.gsub(%r(%{[^}]+})) { |expr|
      values_for_s3_object_key[expr[2...expr.size-1]]
    }
    i += 1
  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 -qf1 -o #{tmp.path} #{w.path}"
    else
      chunk.write_to(tmp)
      tmp.close
    end
    @bucket.objects[s3path].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