Class: Fluent::GrepOutput

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

Constant Summary collapse

REGEXP_MAX_NUM = 
20

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_grep.rb', line 16

def configure(conf)
  super

  @regexps = {}
  @regexps[@input_key] = Regexp.compile(@regexp) if @input_key and @regexp
  (1..REGEXP_MAX_NUM).each do |i|
    next unless conf["regexp#{i}"]
    key, regexp = conf["regexp#{i}"].split(/ +/, 2)
    raise Fluent::ConfigError, "regexp#{i} does not contain 2 parameters" unless regexp
    @regexps[key] = Regexp.compile(regexp)
  end

  @excludes = {}
  @excludes[@input_key] = Regexp.compile(@exclude) if @input_key and @exclude
  (1..REGEXP_MAX_NUM).each do |i|
    next unless conf["exclude#{i}"]
    key, exclude = conf["exclude#{i}"].split(/ +/, 2)
    raise Fluent::ConfigError, "exclude#{i} does not contain 2 parameters" unless exclude
    @excludes[key] = Regexp.compile(exclude)
  end

  if @tag.nil? and @add_tag_prefix.nil? and @remove_tag_prefix.nil?
    @add_tag_prefix = 'greped' # not ConfigError to support lower version compatibility
  end

  @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
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_grep.rb', line 57

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

  es.each do |time,record|
    catch(:break_loop) do
      @regexps.each do |key, regexp|
        throw :break_loop unless match(regexp, record[key].to_s)
      end
      @excludes.each do |key, exclude|
        throw :break_loop if match(exclude, record[key].to_s)
      end
      Fluent::Engine.emit(emit_tag, time, record)
    end
  end

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