Class: Fluent::RewriteRule

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(plugin, conf) ⇒ RewriteRule

Returns a new instance of RewriteRule.



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# File 'lib/fluent/plugin/rewrite_rule.rb', line 5

def initialize(plugin, conf)
  @plugin = plugin
  @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

Instance Attribute Details

#rules ⇒ Object (readonly)

Returns the value of attribute rules.



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# File 'lib/fluent/plugin/rewrite_rule.rb', line 3

def rules
  @rules
end

Instance Method Details

#apply_rule(rule, tag = nil, record) ⇒ Object 



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# File 'lib/fluent/plugin/rewrite_rule.rb', line 34

def apply_rule(rule, tag=nil, 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"] && @plugin.is_a?(Fluent::Plugin::Output)
      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"] && @plugin.is_a?(Fluent::Plugin::Output)
      tag += (tag_prefix + rule["fallback"])
    end
  end

  return [tag, record, last]
end

#rewrite(tag = nil, record) ⇒ Object 



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# File 'lib/fluent/plugin/rewrite_rule.rb', line 18

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

    break  if last
    if @plugin.is_a?(Fluent::Plugin::Output)
      return if !tag && !record
    else
      return if !record
    end
  end

  return [record] if not @plugin.is_a?(Fluent::Plugin::Output)
  return [tag, record] if @plugin.is_a?(Fluent::Plugin::Output)
end