Class: Fluent::Plugin::FileSingleBuffer

Inherits:
Buffer
  • Object
show all
Includes:
SystemConfig::Mixin
Defined in:
lib/fluent/plugin/buf_file_single.rb

Constant Summary collapse

DEFAULT_CHUNK_LIMIT_SIZE =

256MB

256 * 1024 * 1024
DEFAULT_TOTAL_LIMIT_SIZE =

64GB

64 * 1024 * 1024 * 1024
PATH_SUFFIX = 
".#{Fluent::Plugin::Buffer::FileSingleChunk::PATH_EXT}"

Constants inherited from Buffer

Buffer::DEFAULT_CHUNK_FULL_THRESHOLD, Buffer::MINIMUM_APPEND_ATTEMPT_RECORDS, Buffer::STATS_KEYS

Constants included from Configurable

Configurable::CONFIG_TYPE_REGISTRY

Instance Attribute Summary

Attributes inherited from Buffer

#available_buffer_space_ratios_metrics, #dequeued, #newest_timekey_metrics, #oldest_timekey_metrics, #queue, #queue_length_metrics, #queue_size_metrics, #queued_num, #stage, #stage_length_metrics, #stage_size_metrics, #total_queued_size_metrics

Attributes inherited from Base

#under_plugin_development

Instance Method Summary collapse

Methods included from SystemConfig::Mixin

#system_config, #system_config_override

Methods inherited from Buffer

#chunk_size_full?, #chunk_size_over?, #clear_queue!, #close, #dequeue_chunk, #enable_update_timekeys, #enqueue_all, #enqueue_chunk, #enqueue_unstaged_chunk, #metadata, #new_metadata, #purge_chunk, #queue_full?, #queue_size, #queue_size=, #queued?, #queued_records, #stage_size, #stage_size=, #statistics, #storable?, #takeback_chunk, #terminate, #timekeys, #update_timekeys, #write, #write_once, #write_step_by_step

Methods included from Fluent::PluginHelper::Mixin

included

Methods included from Fluent::PluginId

#plugin_id, #plugin_id_configured?, #plugin_id_for_test?, #plugin_root_dir

Methods included from UniqueId::Mixin

#dump_unique_id_hex, #generate_unique_id

Methods included from OwnedByMixin

#log, #owner, #owner=

Methods inherited from Base

#acquire_worker_lock, #after_shutdown, #after_shutdown?, #after_start, #after_started?, #before_shutdown, #before_shutdown?, #called_in_test?, #close, #closed?, #configured?, #context_router, #context_router=, #fluentd_worker_id, #get_lock_path, #has_router?, #inspect, #plugin_root_dir, #reloadable_plugin?, #shutdown, #shutdown?, #started?, #stopped?, #string_safe_encoding, #terminate, #terminated?

Methods included from Configurable

#config, #configure_proxy_generate, #configured_section_create, included, lookup_type, register_type

Constructor Details

#initialize ⇒ FileSingleBuffer

Returns a new instance of FileSingleBuffer.



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# File 'lib/fluent/plugin/buf_file_single.rb', line 51

def initialize
  super

  @multi_workers_available = false
  @additional_resume_path = nil
  @variable_store = nil
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 59

def configure(conf)
  super

  @variable_store = Fluent::VariableStore.fetch_or_build(:buf_file_single)

  if @chunk_format == :auto
    @chunk_format = owner.formatted_to_msgpack_binary? ? :msgpack : :text
  end

  @key_in_path = nil
  if owner.chunk_keys.empty?
    log.debug "use event tag for buffer key"
  else
    if owner.chunk_key_tag
      raise Fluent::ConfigError, "chunk keys must be tag or one field"
    elsif owner.chunk_keys.size > 1
      raise Fluent::ConfigError, "2 or more chunk keys is not allowed"
    else
      @key_in_path = owner.chunk_keys.first.to_sym
    end
  end

  multi_workers_configured = owner.system_config.workers > 1
  using_plugin_root_dir = false
  unless @path
    if root_dir = owner.plugin_root_dir
      @path = File.join(root_dir, 'buffer')
      using_plugin_root_dir = true # plugin_root_dir path contains worker id
    else
      raise Fluent::ConfigError, "buffer path is not configured. specify 'path' in <buffer>"
    end
  end

  specified_directory_exists = File.exist?(@path) && File.directory?(@path)
  unexisting_path_for_directory = !File.exist?(@path) && !@path.include?('.*')

  if specified_directory_exists || unexisting_path_for_directory # directory
    if using_plugin_root_dir || !multi_workers_configured
      @path = File.join(@path, "fsb.*#{PATH_SUFFIX}")
    else
      @path = File.join(@path, "worker#{fluentd_worker_id}", "fsb.*#{PATH_SUFFIX}")
      if fluentd_worker_id == 0
        # worker 0 always checks unflushed buffer chunks to be resumed (might be created while non-multi-worker configuration)
        @additional_resume_path = File.join(File.expand_path("../../", @path), "fsb.*#{PATH_SUFFIX}")
      end
    end
    @multi_workers_available = true
  else # specified path is file path
    if File.basename(@path).include?('.*.')
      new_path = File.join(File.dirname(@path), "fsb.*#{PATH_SUFFIX}")
      log.warn "file_single doesn't allow user specified 'prefix.*.suffix' style path. Use '#{new_path}' for file instead: #{@path}"
      @path = new_path
    elsif File.basename(@path).end_with?('.*')
      @path = @path + PATH_SUFFIX
    else
      # existing file will be ignored
      @path = @path + ".*#{PATH_SUFFIX}"
    end
    @multi_workers_available = false
  end

  type_of_owner = Plugin.lookup_type_from_class(@_owner.class)
  if @variable_store.has_key?(@path) && !called_in_test?
    type_using_this_path = @variable_store[@path]
    raise Fluent::ConfigError, "Other '#{type_using_this_path}' plugin already uses same buffer path: type = #{type_of_owner}, buffer path = #{@path}"
  end

  @variable_store[@path] = type_of_owner
  @dir_permission = if @dir_permission
                      @dir_permission.to_i(8)
                    else
                      system_config.dir_permission || Fluent::DEFAULT_DIR_PERMISSION
                    end
end

#generate_chunk(metadata) ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 199

def generate_chunk(metadata)
  # FileChunk generates real path with unique_id
  perm = @file_permission || system_config.file_permission
  chunk = Fluent::Plugin::Buffer::FileSingleChunk.new(metadata, @path, :create, @key_in_path, perm: perm, compress: @compress)

  log.debug "Created new chunk", chunk_id: dump_unique_id_hex(chunk.unique_id), metadata: metadata

  chunk
end

#handle_broken_files(path, mode, e) ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 209

def handle_broken_files(path, mode, e)
  log.error "found broken chunk file during resume. Delete corresponding files:", path: path, mode: mode, err_msg: e.message
  # After support 'backup_dir' feature, these files are moved to backup_dir instead of unlink.
  File.unlink(path) rescue nil
end

#multi_workers_ready? ⇒ Boolean

This method is called only when multi worker is configured

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/buf_file_single.rb', line 135

def multi_workers_ready?
  unless @multi_workers_available
    log.error "file_single buffer with multi workers should be configured to use directory 'path', or system root_dir and plugin id"
  end
  @multi_workers_available
end

#persistent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/buf_file_single.rb', line 156

def persistent?
  true
end

#resume ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 160

def resume
  stage = {}
  queue = []

  patterns = [@path]
  patterns.unshift @additional_resume_path if @additional_resume_path
  Dir.glob(escaped_patterns(patterns)) do |path|
    next unless File.file?(path)

    log.debug { "restoring buffer file: path = #{path}" }

    m = new_metadata() # this metadata will be updated in FileSingleChunk.new
    mode = Fluent::Plugin::Buffer::FileSingleChunk.assume_chunk_state(path)
    if mode == :unknown
      log.debug "unknown state chunk found", path: path
      next
    end

    begin
      chunk = Fluent::Plugin::Buffer::FileSingleChunk.new(m, path, mode, @key_in_path, compress: @compress)
      chunk.restore_size(@chunk_format) if @calc_num_records
    rescue Fluent::Plugin::Buffer::FileSingleChunk::FileChunkError => e
      handle_broken_files(path, mode, e)
      next
    end

    case chunk.state
    when :staged
      stage[chunk.metadata] = chunk
    when :queued
      queue << chunk
    end
  end

  queue.sort_by!(&:modified_at)

  return stage, queue
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 142

def start
  FileUtils.mkdir_p(File.dirname(@path), mode: @dir_permission)

  super
end

#stop ⇒ Object 



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# File 'lib/fluent/plugin/buf_file_single.rb', line 148

def stop
  if @variable_store
    @variable_store.delete(@path)
  end

  super
end