Class: Fluent::S3Output

Inherits:

TimeSlicedOutput

• Object
• TimeSlicedOutput
• Fluent::S3Output

Includes:

Mixin::ConfigPlaceholders

Defined in:

lib/fluent/plugin/out_s3.rb,
lib/fluent/plugin/s3_compressor_lzo.rb,
lib/fluent/plugin/s3_compressor_lzma2.rb,
lib/fluent/plugin/s3_compressor_gzip_command.rb

Defined Under Namespace

Classes: Compressor, GzipCommandCompressor, GzipCompressor, JsonCompressor, LZMA2Compressor, LZOCompressor, TextCompressor

Constant Summary

MAX_HEX_RANDOM_LENGTH =

16

Instance Attribute Summary

• #bucket ⇒ Object readonly

  Returns the value of attribute bucket.

Instance Method Summary

• #configure(conf) ⇒ Object
• #desc(description) ⇒ Object
• #format(tag, time, record) ⇒ Object
• #initialize ⇒ S3Output constructor

  A new instance of S3Output.

• #placeholders ⇒ Object
• #start ⇒ Object
• #write(chunk) ⇒ Object

Constructor Details

#initialize ⇒ S3Output

Returns a new instance of S3Output.

# File 'lib/fluent/plugin/out_s3.rb', line 8

def initialize
  super
  require 'aws-sdk-resources'
  require 'zlib'
  require 'time'
  require 'tempfile'

  @compressor = nil
end

Instance Attribute Details

#bucket ⇒ Object (readonly)

Returns the value of attribute bucket.

# File 'lib/fluent/plugin/out_s3.rb', line 113

def bucket
  @bucket
end

Instance Method Details

#configure(conf) ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 122

def configure(conf)
  super

  if @s3_endpoint && @s3_endpoint.end_with?('amazonaws.com')
    raise ConfigError, "s3_endpoint parameter is not supported for S3, use s3_region instead. This parameter is for S3 compatible services"
  end

  begin
    @compressor = COMPRESSOR_REGISTRY.lookup(@store_as).new(:buffer_type => @buffer_type, :log => log)
  rescue
    $log.warn "#{@store_as} not found. Use 'text' instead"
    @compressor = TextCompressor.new
  end
  @compressor.configure(conf)

  @formatter = Plugin.new_formatter(@format)
  @formatter.configure(conf)

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

  if @hex_random_length > MAX_HEX_RANDOM_LENGTH
    raise ConfigError, "hex_random_length parameter must be less than or equal to #{MAX_HEX_RANDOM_LENGTH}"
  end

  @storage_class = "REDUCED_REDUNDANCY" if @reduced_redundancy
  @values_for_s3_object_chunk = {}
end

#desc(description) ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 21

def desc(description)
end

#format(tag, time, record) ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 179

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

#placeholders ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 118

def placeholders
  [:percent]
end

#start ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 158

def start
  super
  options = setup_credentials
  options[:region] = @s3_region if @s3_region
  options[:endpoint] = @s3_endpoint if @s3_endpoint
  options[:http_proxy] = @proxy_uri if @proxy_uri
  options[:force_path_style] = @force_path_style
  options[:compute_checksums] = @compute_checksums unless @compute_checksums.nil?
  options[:signature_version] = @signature_version unless @signature_version.nil?

  s3_client = Aws::S3::Client.new(options)
  @s3 = Aws::S3::Resource.new(:client => s3_client)
  @bucket = @s3.bucket(@s3_bucket)

  check_apikeys if @check_apikey_on_start
  ensure_bucket

  # Securerandom.hex(2) returns 4 length hex
  @hex_random_n = (@hex_random_length + 1) / 2
end

#write(chunk) ⇒ Object

# File 'lib/fluent/plugin/out_s3.rb', line 183

def write(chunk)
  i = 0
  previous_path = nil

  begin
    path = @path_slicer.call(@path)

    @values_for_s3_object_chunk[chunk.unique_id] ||= {
      "hex_random" => hex_random(chunk),
    }
    values_for_s3_object_key = {
      "path" => path,
      "time_slice" => chunk.key,
      "file_extension" => @compressor.ext,
      "index" => i,
      "uuid_flush" => uuid_random,
    }.merge!(@values_for_s3_object_chunk[chunk.unique_id])

    s3path = @s3_object_key_format.gsub(%r(%{[^}]+})) { |expr|
      values_for_s3_object_key[expr[2...expr.size-1]]
    }
    if (i > 0) && (s3path == previous_path)
      if @overwrite
        log.warn "#{s3path} already exists, but will overwrite"
        break
      else
        raise "duplicated path is generated. use %{index} in s3_object_key_format: path = #{s3path}"
      end
    end

    i += 1
    previous_path = s3path
  end while @bucket.object(s3path).exists?

  tmp = Tempfile.new("s3-")
  tmp.binmode
  begin
    @compressor.compress(chunk, tmp)
    tmp.rewind
    log.debug { "out_s3: write chunk: {key:#{chunk.key},tsuffix:#{tsuffix(chunk)}} to s3://#{@s3_bucket}/#{s3path}" }

    put_options = {
      :body => tmp,
      :content_type => @compressor.content_type,
      :storage_class => @storage_class,
    }
    put_options[:server_side_encryption] = @use_server_side_encryption if @use_server_side_encryption
    put_options[:ssekms_key_id] = @ssekms_key_id if @ssekms_key_id
    put_options[:acl] = @acl if @acl
    @bucket.object(s3path).put(put_options)

    @values_for_s3_object_chunk.delete(chunk.unique_id)

    if @warn_for_delay
      if Time.strptime(chunk.key, @time_slice_format) < Time.now - @warn_for_delay
        log.warn { "out_s3: delayed events were put to s3://#{@s3_bucket}/#{s3path}" }
      end
    end
  ensure
    tmp.close(true) rescue nil
  end
end