Class: Fluent::RTFDashOutput

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

Constant Summary collapse

MATCH_OPERATOR_EXCLUDE = 
'!'

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 14

def configure(conf)
  super

  @rewriterules = []
  rewriterule_names = []
  @hostname = `#{@hostname_command}`.chomp

  conf.keys.select{|k| k =~ /^rewriterule(\d+)$/}.sort_by{|i| i.sub('rewriterule', '').to_i}.each do |key|
    rewritekey,regexp,rewritetag = parse_rewriterule(conf[key])
    if regexp.nil? || rewritetag.nil?
      raise Fluent::ConfigError, "failed to parse rewriterules at #{key} #{conf[key]}"
    end
    @rewriterules.push([rewritekey, /#{trim_regex_quote(regexp)}/, get_match_operator(regexp), rewritetag])
    rewriterule_names.push(rewritekey + regexp)
    $log.info "adding rewrite_tag_filter rule: #{key} #{@rewriterules.last}"
  end

  unless @rewriterules.length > 0
    raise Fluent::ConfigError, "missing rewriterules"
  end

  unless @rewriterules.length == rewriterule_names.uniq.length
    raise Fluent::ConfigError, "duplicated rewriterules found #{@rewriterules.inspect}"
  end

  unless @remove_tag_prefix.nil?
    @remove_tag_prefix = /^#{Regexp.escape(@remove_tag_prefix)}\.?/
  end

  unless @use_of_first_match_tag_regexp.nil?
    @use_of_first_match_tag_regexp = Regexp.new(@use_of_first_match_tag_regexp)
  end
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 48

def emit(tag, es, chain)
  es.each do |time,record|
    rewrited_tag = rewrite_tag(tag, record)
    next if rewrited_tag.nil? || tag == rewrited_tag
    Fluent::Engine.emit(rewrited_tag, time, record)
  end

  chain.next
end

#get_backreference_table(elements) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 100

def get_backreference_table(elements)
  hash_table = Hash.new
  elements.each.with_index(1) do |value, index|
    hash_table["$#{index}"] = @capitalize_regex_backreference ? value.capitalize : value
  end
  return hash_table
end

#get_match_operator(regexp) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 95

def get_match_operator(regexp)
  return MATCH_OPERATOR_EXCLUDE if regexp.start_with?(MATCH_OPERATOR_EXCLUDE)
  return ''
end

#get_placeholder(tag) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 108

def get_placeholder(tag)
  tag = tag.sub(@remove_tag_prefix, '') if @remove_tag_prefix
  tag = tag.match(@use_of_first_match_tag_regexp)[1] if @use_of_first_match_tag_regexp
  p tag
  return {
    '__HOSTNAME__' => @hostname,
    '${hostname}' => @hostname,
    '__TAG__' => tag,
    '${tag}' => tag,
  }
end

#parse_rewriterule(rule) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 78

def parse_rewriterule(rule)
  if rule.match(/^([^\s]+)\s+(.+?)\s+([^\s]+)$/)
    return $~.captures
  end
end

#rewrite_tag(tag, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 58

def rewrite_tag(tag, record)
  placeholder = get_placeholder(tag)
  @rewriterules.each do |rewritekey, regexp, match_operator, rewritetag|
    rewritevalue = record[rewritekey].to_s
    next if rewritevalue.empty? && match_operator != MATCH_OPERATOR_EXCLUDE
    matched = regexp && regexp.match(rewritevalue)
    case match_operator
    when MATCH_OPERATOR_EXCLUDE
      next if matched
    else
      next if !matched
      backreference_table = get_backreference_table($~.captures)
      rewritetag = rewritetag.gsub(/\$\d+/, backreference_table)
    end
    rewritetag = rewritetag.gsub(/(\${[a-z]+(\[[0-9]+\])?}|__[A-Z]+__)/, placeholder)
    return rewritetag
  end
  return nil
end

#trim_regex_quote(regexp) ⇒ Object 



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# File 'lib/fluent/plugin/out_rtf_dash.rb', line 84

def trim_regex_quote(regexp)
  if regexp.start_with?('"') && regexp.end_with?('"')
    $log.info "rewrite_tag_filter: [DEPRECATED] Use ^....$ pattern for partial word match instead of double-quote-delimiter. #{regexp}"
    regexp = regexp[1..-2]
  end
  if regexp.start_with?(MATCH_OPERATOR_EXCLUDE)
    regexp = regexp[1, regexp.length]
  end
  return regexp
end