Class: Fluent::RewriteOutput

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#rules ⇒ Object (readonly)

Returns the value of attribute rules.



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# File 'lib/fluent/plugin/out_rewrite.rb', line 9

def rules
  @rules
end

Instance Method Details

#apply_rule(rule, tag, record) ⇒ Object 



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

def apply_rule(rule, tag, record)
  tag_prefix = tag && tag.length > 0 ? "." : ""
  key        = rule["key"]
  pattern    = rule["pattern"]
  last       = nil

  return [tag, record] if !key || !record.has_key?(key)
  return [tag, record] unless pattern

  if matched = record[key].match(rule["regex"])
    return if rule["ignore"]

    if rule["replace"]
      replace = rule["replace"]
      record[key] = record[key].gsub(rule["regex"], replace)
    end

    if rule["append_to_tag"]
      if rule["tag"]
        tag += (tag_prefix + rule["tag"])
      else
        matched.captures.each do |m|
          tag += (tag_prefix + "#{m}")
        end
      end
    end

    if rule["last"]
      last = true
    end
  else
    if rule["append_to_tag"] && rule["fallback"]
      tag += (tag_prefix + rule["fallback"])
    end
  end

  [tag, record, last]
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_rewrite.rb', line 11

def configure(conf)
  super

  if @remove_prefix
    @removed_prefix_string = @remove_prefix + '.'
    @removed_length = @removed_prefix_string.length
  end
  if @add_prefix
    @added_prefix_string = @add_prefix + '.'
  end

  @rules = conf.elements.select {|element| element.name == 'rule' }.map do |element|
    rule = {}
    element.keys.each do |key|
      # read and throw away to supress unread configuration warning
      rule[key] = element[key]
    end
    rule["regex"] = Regexp.new(element["pattern"]) if element.has_key?("pattern")
    rule
  end
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_rewrite.rb', line 41

def emit(tag, es, chain)
  _tag = tag.clone

  if @remove_prefix and
    ((tag.start_with?(@removed_prefix_string) && tag.length > @removed_length) || tag == @remove_prefix)
    tag = tag[@removed_length..-1] || ''
  end

  if @add_prefix
    tag = tag && tag.length > 0 ? @added_prefix_string + tag : @add_prefix
  end

  es.each do |time, record|
    filtered_tag, record = rewrite(tag, record)
    if filtered_tag && record && _tag != filtered_tag
      Engine.emit(filtered_tag, time, record)
    else
      if @enable_warnings
        $log.warn "Can not emit message because the tag(#{tag}) has not changed. Dropped record #{record}"
      end
    end
  end

  chain.next
end

#rewrite(tag, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_rewrite.rb', line 67

def rewrite(tag, record)
  rules.each do |rule|
    tag, record, last = apply_rule(rule, tag, record)

    break  if last
    return if !tag && !record
  end

  [tag, record]
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_rewrite.rb', line 37

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_rewrite.rb', line 33

def start
  super
end