Class: Fluent::Plugin::QueryStringParserFilter

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ QueryStringParserFilter

Returns a new instance of QueryStringParserFilter.



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# File 'lib/fluent/plugin/filter_query_string_parser.rb', line 17

def initialize
  super
  require "addressable/uri"
end

Instance Method Details

#cleaner_prefix(line) ⇒ Object 



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

def cleaner_prefix(line)
  line.gsub(Regexp.new('^.*(\?)'), '').strip
end

#filter(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/filter_query_string_parser.rb', line 36

def filter(tag, time, record)
  raw_value = record[@key_name]

  if raw_value.nil?
    if @emit_invalid_record_to_error
      router.emit_error_event(tag, time, record, ArgumentError.new("#{@key_name} does not exist"))
    end
    return @ignore_key_not_exist ? nil : record
  end

  begin
    if valid_url(raw_value)
      uri = Addressable::URI.parse(raw_value)
      values = {}
      values[@out_key_path] = uri.path if @out_key_path
      values[@out_key_query] = uri.query if @out_key_query
      values[@out_key_fragment] = uri.fragment if @out_key_fragment
      values.reject! {|_, v| v.nil? } if @ignore_nil
      unless values[@out_key_query].nil?
        params = Addressable::URI.form_unencode(cleaner_prefix(values[@out_key_query]))

        unless params.nil?
          if @multi_value_params
            values = Hash.new {|h,k| h[k] = [] }
            params.each{|pair| values[pair[0]].push(pair[1])}
          else
            values = Hash[params]
          end
          if @inject_key_prefix
            values = Hash[values.map{|k,v| [ @inject_key_prefix + k, v ]}]
          end
          r = @hash_value_field ? { @hash_value_field => values } : values
          record = record.merge(r)
        end
      end

    else
      log.warn "url not valid: #{raw_value}"
    end
  rescue => e
      log.warn "parse failed #{e.message}" unless @suppress_parse_error_log
  end
  record
end

#valid_url(line) ⇒ Object 



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

def valid_url(line)
  if line.match(Regexp.new('(https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|www\.[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9]+\.[^\s]{2,}|www\.[a-zA-Z0-9]+\.[^\s]{2,})'))
    true
  elsif line.nil?
    false
  else
    false
  end
end