Class: Fluent::DeriveOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_derive.rb

Constant Summary collapse

KEY_MAX_NUM = 
20

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#key_pattern ⇒ Object (readonly)

for test



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

def key_pattern
  @key_pattern
end

#key_pattern_adjustment ⇒ Object (readonly)

Returns the value of attribute key_pattern_adjustment.



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# File 'lib/fluent/plugin/out_derive.rb', line 22

def key_pattern_adjustment
  @key_pattern_adjustment
end

#keys ⇒ Object (readonly)

Returns the value of attribute keys.



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

def keys
  @keys
end

#prev ⇒ Object (readonly)

Returns the value of attribute prev.



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# File 'lib/fluent/plugin/out_derive.rb', line 24

def prev
  @prev
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_derive.rb', line 26

def configure(conf)
  super

  if @key_pattern
    key_pattern, @key_pattern_adjustment = @key_pattern.split(/ +/, 2)
    @key_pattern_adjustment = parse_adjustment(@key_pattern_adjustment)
    @key_pattern = Regexp.compile(key_pattern)
  else
    @keys = {}
    (1..KEY_MAX_NUM).each do |i|
      next unless conf["key#{i}"] 
      key, adjustment = conf["key#{i}"].split(/ +/, 2)
      adjustment = parse_adjustment(adjustment)
      @keys[key] = adjustment
    end
  end
  raise Fluent::ConfigError, "Either of `key_pattern` or `key1` must be specified" if (@key_pattern.nil? and @keys.empty?)

  raise Fluent::ConfigError, "Either of `tag`, `add_tag_prefix`, or `remove_tag_prefix` must be specified" if (@tag.nil? and @add_tag_prefix.nil? and @remove_tag_prefix.nil?)
  @tag_prefix = "#{@add_tag_prefix}." if @add_tag_prefix
  @tag_prefix_match = "#{@remove_tag_prefix}." if @remove_tag_prefix
  @tag_proc =
    if @tag
      Proc.new {|tag| @tag }
    elsif @tag_prefix and @tag_prefix_match
      Proc.new {|tag| "#{@tag_prefix}#{lstrip(tag, @tag_prefix_match)}" }
    elsif @tag_prefix_match
      Proc.new {|tag| lstrip(tag, @tag_prefix_match) }
    elsif @tag_prefix
      Proc.new {|tag| "#{@tag_prefix}#{tag}" }
    else
      Proc.new {|tag| tag }
    end

  raise Fluent::ConfigError, "`max` must be greater than `min`" if (@min && @max && @min >= @max)

  @prev = {}
  @mutex = Mutex.new
rescue => e
  raise Fluent::ConfigError, "#{e.class} #{e.message} #{e.backtrace.first}"
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_derive.rb', line 76

def emit(tag, es, chain)
  emit_tag = @tag_proc.call(tag)

  if @key_pattern
    es.each do |time, record|
      record.each do |key, value|
        next unless key =~ @key_pattern
        value = value.to_i
        prev_time, prev_value = get_prev_value(tag, key)
        unless prev_time && prev_value
          save_to_prev(time, tag, key, value)
          record[key] = nil
          next
        end
        # adjustment
        rate = calc_rate(tag, key, value, prev_value, time, prev_time, @key_pattern_adjustment)
        rate = truncate_min(rate, @min) if @min
        rate = truncate_max(rate, @max) if @max
        # Set new value
        record[key] = rate
        save_to_prev(time, tag, key, value)
      end
      Fluent::Engine.emit(emit_tag, time, record)
    end
  else #keys
    es.each do |time, record|
      @keys.each do |key, adjustment|
        next unless  value = record[key]
        value = value.to_i
        prev_time, prev_value = get_prev_value(tag, key)
        unless prev_time && prev_value
          save_to_prev(time, tag, key, value)
          record[key] = nil
          next
        end
        # adjustment
        rate = calc_rate(tag, key, value, prev_value, time, prev_time, adjustment)
        rate = truncate_min(rate, @min) if @min
        rate = truncate_max(rate, @max) if @max
        # Set new value
        record[key] = rate
        save_to_prev(time, tag, key, value)
      end
      Fluent::Engine.emit(emit_tag, time, record)
    end
  end

  chain.next
rescue => e
  log.warn e.message
  log.warn e.backtrace.join(', ')
end

#get_prev_value(tag, key) ⇒ Array

Returns time, value.

Returns:

  • (Array) —

    time, value



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# File 'lib/fluent/plugin/out_derive.rb', line 130

def get_prev_value(tag, key)
  @prev["#{tag}:#{key}"] || []
end

#save_to_prev(time, tag, key, value) ⇒ Object 



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# File 'lib/fluent/plugin/out_derive.rb', line 134

def save_to_prev(time, tag, key, value)
  @mutex.synchronize { @prev["#{tag}:#{key}"] = [time, value] }
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_derive.rb', line 72

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_derive.rb', line 68

def start
  super
end