Class: Fluent::ElapsedTimeOutput

Inherits:
MultiOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_elapsed_time.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ElapsedTimeOutput

Returns a new instance of ElapsedTimeOutput.



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 23

def initialize
  super
  @outputs = []
  @elapsed = {}
end

Instance Attribute Details

#outputs ⇒ Object (readonly)

for test



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 30

def outputs
  @outputs
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 36

def configure(conf)
  super
  conf.elements.select {|e|
    e.name == 'store'
  }.each {|e|
    type = e['type']
    unless type
      raise ConfigError, "Missing 'type' parameter on <store> directive"
    end
    $log.debug "adding store type=#{type.dump}"

    output = Plugin.new_output(type)
    output.configure(e)
    @outputs << output
  }

  case @aggregate
  when 'all'
    raise ConfigError, "out_elapsed_time: `tag` must be specified with aggregate all" if @tag.nil?
  when 'tag'
    raise ConfigError, "out_elapsed_time: `add_tag_prefix` or `remove_tag_prefix` must be specified with aggregate tag" if @add_tag_prefix.nil? and @remove_tag_prefix.nil?
  else
    raise ConfigError, "out_elapsed_time: aggregate allows `tag` or `all`"
  end

  @tag_slice_proc =
    if @remove_tag_slice
      lindex, rindex = @remove_tag_slice.split('..', 2)
      if lindex.nil? or rindex.nil? or lindex !~ /^-?\d+$/ or rindex !~ /^-?\d+$/
        raise Fluent::ConfigError, "out_elapsed_time: remove_tag_slice must be formatted like [num]..[num]"
      end
      l, r = lindex.to_i, rindex.to_i
      Proc.new {|tag| (tags = tag.split('.')[l..r]).nil? ? "" : tags.join('.') }
    else
      Proc.new {|tag| tag }
    end

  @tag_prefix = "#{@add_tag_prefix}." if @add_tag_prefix
  @tag_prefix_match = "#{@remove_tag_prefix}." if @remove_tag_prefix
  @tag_proc =
    if @tag_prefix and @tag_prefix_match
      Proc.new {|tag| "#{@tag_prefix}#{lstrip(@tag_slice_proc.call(tag), @tag_prefix_match)}" }
    elsif @tag_prefix_match
      Proc.new {|tag| lstrip(@tag_slice_proc.call(tag), @tag_prefix_match) }
    elsif @tag_prefix
      Proc.new {|tag| "#{@tag_prefix}#{@tag_slice_proc.call(tag)}" }
    elsif @tag
      Proc.new {|tag| @tag }
    else
      Proc.new {|tag| @tag_slice_proc.call(tag) }
    end

  @emit_proc =
    if @each == :message
      chain = NullOutputChain.instance
      Proc.new {|tag, es|
        start = Time.now
        es.each do |time, record|
          @outputs.each {|output| output.emit(tag, OneEventStream.new(time, record), chain) }
          finish = Time.now
          emit_tag = @tag_proc.call(tag)
          elapsed(emit_tag) << (finish - start).to_f
          start = finish
        end
      }
    else
      chain = NullOutputChain.instance
      Proc.new {|tag, es|
        t = Time.now
        @outputs.each {|output| output.emit(tag, es, chain) }
        emit_tag = @tag_proc.call(tag)
        elapsed(emit_tag) << (Time.now - t).to_f
      }
    end
end

#elapsed(tag = "elapsed") ⇒ Object

default: @tag



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 32

def elapsed(tag = "elapsed") # default: @tag
  @elapsed[tag] ||= []
end

#emit(tag, es, chain) ⇒ Object 



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

def emit(tag, es, chain)
  @emit_proc.call(tag, es)
  chain.next
end

#flush_emit ⇒ Object 



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

def flush_emit
  flushed_elapsed, @elapsed = @elapsed, initial_elapsed(@elapsed)
  messages = {}
  flushed_elapsed.each do |tag, elapsed|
    num = elapsed.size
    max = num == 0 ? 0 : elapsed.max
    avg = num == 0 ? 0 : elapsed.map(&:to_f).inject(:+) / num.to_f
    messages[tag] = {"max" => max, "avg" => avg, "num" => num}
  end
  messages.each {|tag, message| Engine.emit(tag, Engine.now, message) }
end

#initial_elapsed(prev_elapsed = nil) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 112

def initial_elapsed(prev_elapsed = nil)
  return {} if !@zero_emit or prev_elapsed.nil?
  elapsed = {}
  prev_elapsed.keys.each do |tag|
    next if prev_elapsed[tag].empty? # Prohibit to emit anymore
    elapsed[tag] = []
  end
  elapsed
end

#lstrip(string, substring) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 165

def lstrip(string, substring)
  string.index(substring) == 0 ? string[substring.size..-1] : string
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 137

def run
  @last_checked ||= Engine.now
  while (sleep 0.1)
    now = Engine.now
    if now - @last_checked >= @interval
      flush_emit
      @last_checked = now
    end
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 129

def shutdown
  @outputs.each {|o|
    o.shutdown
  }
  @thread.terminate
  @thread.join
end

#start ⇒ Object 



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

def start
  @outputs.each {|o|
    o.start
  }
  @thread = Thread.new(&method(:run))
end