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Fluent::EngineClass

Attributes

matches[R]
sources[R]

Public Class Methods

new() click to toggle source
# File lib/fluent/engine.rb, line 20
def initialize
  @matches = []
  @sources = []
  @match_cache = {}
  @match_cache_keys = []
  @started_sources = []
  @started_matches = []
  @default_loop = nil
  @engine_stopped = false

  @log_emit_thread = nil
  @log_event_loop_stop = false
  @log_event_queue = []

  @suppress_emit_error_log_interval = 0
  @next_emit_error_log_time = nil

  @suppress_config_dump = false
  @without_source = false
end

Public Instance Methods

configure(conf) click to toggle source
# File lib/fluent/engine.rb, line 87
def configure(conf)
  # plugins / configuration dumps
  Gem::Specification.find_all.select{|x| x.name =~ /^fluent(d|-(plugin|mixin)-.*)$/}.each do |spec|
    $log.info "gem '#{spec.name}' version '#{spec.version}'"
  end

  unless @suppress_config_dump
    $log.info "using configuration file: #{conf.to_s.rstrip}"
  end

  if @without_source
    $log.info "'--without-source' is applied. Ignore <source> sections"
  else
    conf.elements.select {|e|
      e.name == 'source'
    }.each {|e|
      type = e['type']
      unless type
        raise ConfigError, "Missing 'type' parameter on <source> directive"
      end
      $log.info "adding source type=#{type.dump}"

      input = Plugin.new_input(type)
      input.configure(e)

      @sources << input
    }
  end

  conf.elements.select {|e|
    e.name == 'match'
  }.each {|e|
    type = e['type']
    pattern = e.arg
    unless type
      raise ConfigError, "Missing 'type' parameter on <match #{e.arg}> directive"
    end
    $log.info "adding match", :pattern=>pattern, :type=>type

    output = Plugin.new_output(type)
    output.configure(e)

    match = Match.new(pattern, output)
    @matches << match
  }
end
emit(tag, time, record) click to toggle source
# File lib/fluent/engine.rb, line 138
def emit(tag, time, record)
  unless record.nil?
    emit_stream tag, OneEventStream.new(time, record)
  end
end
emit_array(tag, array) click to toggle source
# File lib/fluent/engine.rb, line 144
def emit_array(tag, array)
  emit_stream tag, ArrayEventStream.new(array)
end
emit_stream(tag, es) click to toggle source
# File lib/fluent/engine.rb, line 148
def emit_stream(tag, es)
  target = @match_cache[tag]
  unless target
    target = match(tag) || NoMatchMatch.new
    # this is not thread-safe but inconsistency doesn't
    # cause serious problems while locking causes.
    if @match_cache_keys.size >= MATCH_CACHE_SIZE
      @match_cache.delete @match_cache_keys.shift
    end
    @match_cache[tag] = target
    @match_cache_keys << tag
  end
  target.emit(tag, es)
rescue => e
  if @suppress_emit_error_log_interval == 0 || now > @next_emit_error_log_time
    $log.warn "emit transaction failed ", :error_class=>e.class, :error=>e
    $log.warn_backtrace
    # $log.debug "current next_emit_error_log_time: #{Time.at(@next_emit_error_log_time)}"
    @next_emit_error_log_time = Time.now.to_i + @suppress_emit_error_log_interval
    # $log.debug "next emit failure log suppressed"
    # $log.debug "next logged time is #{Time.at(@next_emit_error_log_time)}"
  end
  raise
end
flush!() click to toggle source
# File lib/fluent/engine.rb, line 181
def flush!
  flush_recursive(@matches)
end
init(opts = {}) click to toggle source
# File lib/fluent/engine.rb, line 47
def init(opts = {})
  BasicSocket.do_not_reverse_lookup = true
  Plugin.load_plugins
  if defined?(Encoding)
    Encoding.default_internal = 'ASCII-8BIT' if Encoding.respond_to?(:default_internal)
    Encoding.default_external = 'ASCII-8BIT' if Encoding.respond_to?(:default_external)
  end

  suppress_interval(opts[:suppress_interval]) if opts[:suppress_interval]
  @suppress_config_dump = opts[:suppress_config_dump] if opts[:suppress_config_dump]
  @without_source = opts[:without_source] if opts[:without_source]

  self
end
load_plugin_dir(dir) click to toggle source
# File lib/fluent/engine.rb, line 134
def load_plugin_dir(dir)
  Plugin.load_plugin_dir(dir)
end
log_event_loop() click to toggle source
# File lib/fluent/engine.rb, line 190
def log_event_loop
  $log.disable_events(Thread.current)

  while sleep(LOG_EMIT_INTERVAL)
    break if @log_event_loop_stop
    next if @log_event_queue.empty?

    # NOTE: thead-safe of slice! depends on GVL
    events = @log_event_queue.slice!(0..-1)
    next if events.empty?

    events.each {|tag,time,record|
      begin
        Engine.emit(tag, time, record)
      rescue => e
        $log.error "failed to emit fluentd's log event", :tag => tag, :event => record, :error_class => e.class, :error => e
      end
    }
  end
end
match(tag) click to toggle source
# File lib/fluent/engine.rb, line 173
def match(tag)
  @matches.find {|m| m.match(tag) }
end
match?(tag) click to toggle source
# File lib/fluent/engine.rb, line 177
def match?(tag)
  !!match(tag)
end
now() click to toggle source
# File lib/fluent/engine.rb, line 185
def now
  # TODO thread update
  Time.now.to_i
end
parse_config(io, fname, basepath = Dir.pwd, v1_config = false) click to toggle source
# File lib/fluent/engine.rb, line 67
def parse_config(io, fname, basepath = Dir.pwd, v1_config = false)
  if fname =~ /\.rb$/
    require 'fluent/config/dsl'
    Config::DSL::Parser.parse(io, File.join(basepath, fname))
  else
    Config.parse(io, fname, basepath, v1_config)
  end
end
push_log_event(tag, time, record) click to toggle source
# File lib/fluent/engine.rb, line 255
def push_log_event(tag, time, record)
  return if @log_emit_thread.nil?
  @log_event_queue.push([tag, time, record])
end
run() click to toggle source
# File lib/fluent/engine.rb, line 211
def run
  begin
    start

    if match?($log.tag)
      $log.enable_event
      @log_emit_thread = Thread.new(&method(:log_event_loop))
    end

    unless @engine_stopped
      # for empty loop
      @default_loop = Coolio::Loop.default
      @default_loop.attach Coolio::TimerWatcher.new(1, true)
      # TODO attach async watch for thread pool
      @default_loop.run
    end

    if @engine_stopped and @default_loop
      @default_loop.stop
      @default_loop = nil
    end

  rescue => e
    $log.error "unexpected error", :error_class=>e.class, :error=>e
    $log.error_backtrace
  ensure
    $log.info "shutting down fluentd"
    shutdown
    if @log_emit_thread
      @log_event_loop_stop = true
      @log_emit_thread.join
    end
  end
end
run_configure(conf) click to toggle source
# File lib/fluent/engine.rb, line 76
def run_configure(conf)
  configure(conf)
  conf.check_not_fetched { |key, e|
    unless e.name == 'system'
      unless @without_source && e.name == 'source'
        $log.warn "parameter '#{key}' in #{e.to_s.strip} is not used."
      end
    end
  }
end
stop() click to toggle source
# File lib/fluent/engine.rb, line 246
def stop
  @engine_stopped = true
  if @default_loop
    @default_loop.stop
    @default_loop = nil
  end
  nil
end
suppress_interval(interval_time) click to toggle source
# File lib/fluent/engine.rb, line 62
def suppress_interval(interval_time)
  @suppress_emit_error_log_interval = interval_time
  @next_emit_error_log_time = Time.now.to_i
end

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