Class: Fluent::ReassembleOutput

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

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_reassemble.rb', line 19

def configure(conf)
    super
    unless config.has_key?('output_tag')
        raise Fluent::ConfigError, "you must set 'output_tag'"
    end
    unless config.has_key?('assemble')
        raise Fluent::ConfigError, "you must set 'assemble'"
    end
    if config.has_key?('tz')
        ENV["TZ"] = config['tz']
    end
    #assemble definition format
    # {extract_key1}:{replaced_key1}:{operation1},{extract_key2}:{replaced_key2}:{operation2},....{extract_keyN}:{replaced_keyN}:{operationN}
    @reassemble_conf = []
    @assemble.split(",").each{ |conf|
        extract, replace, operation = conf.split(":")
        if extract.nil? || extract.empty?
            next
        else
            extract = extract.strip
        end
        if replace.nil? || replace.empty?
            replace = extract
        else
            replace = replace.strip
        end
        unless operation.nil? || operation.empty?
            operation = operation.strip
        end
        @reassemble_conf.push({:extract => extract, :replace => replace, :operation => operation})
    }
    $log.info "reassemble conf : " + @reassemble_conf.to_s
end

#convert(val, operation) ⇒ Object 



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# File 'lib/fluent/plugin/out_reassemble.rb', line 114

def convert(val, operation)
    if operation.nil?
        return val
    end
    unless operation.start_with?("fixval_")
        if val.nil?
            return val
        end
    end

    o = operation.downcase
    begin
        case o
        when "to_s"
            return val.to_s
        when "to_i"
            return val.to_i
        when "to_f"
            return val.to_f
        when "to_json"
            return val.to_json
        when "bool_to_i"
            if (val.is_a?(TrueClass) || val.is_a?(FalseClass))
                if val
                    return 1
                else
                    return 0
                end
            else
                val.to_i
            end
        when "unixtime_to_datetime"
            return Time.at(val.to_i).strftime(@datetime_format)
        when "unixtime_to_date"
            return Time.at(val.to_i).strftime(@date_format)
        when "unixtime_to_time"
            return Time.at(val.to_i).strftime(@time_format)
        when "url_to_host","url_to_domain"
            return URI(val.to_s).host
        when "url_to_path"
            return URI(val.to_s).path
        when /^add_([\d]+)/
            num = o.gsub(/^add_([\d]+)/, '\1').to_i
            return val + num
        when /^sub_([\d]+)/
            num = o.gsub(/^sub_([\d]+)/, '\1').to_i
            return val - num
        when /^mul_([\d]+)/
            num = o.gsub(/^mul_([\d]+)/, '\1').to_i
            return val * num
        when /^div_([\d]+)/
            num = o.gsub(/^div_([\d]+)/, '\1').to_i
            return val / num
        when /^fixval_(.*)/
            return o.gsub(/^fixval_(.*)/, '\1').to_s
        else
            return val
        end
    rescue
        $log.warn $!
        return val
    end

end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_reassemble.rb', line 53

def emit(tag, es, chain)
    chain.next
    es.each {|time,record|
        if @expand_extract_key.nil?
            json = reassemble(record)
            Fluent::Engine.emit(@output_tag, time, json)
        else
            replaced_key = @expand_replaced_key
            if @expand_replaced_key.nil? || @expand_replaced_key.empty?
                replaced_key = @expand_extract_key
            end
            operation = @expand_operation
            traversed = traverse(record, @expand_extract_key)
            if traversed
                traversed.each { |r|
                    json = reassemble(record)
                    val = convert(r, operation)
                    if !(val.nil?)
                        json[replaced_key] = val
                    elsif @null_to_null
                        json[replaced_key] = nil
                    elsif @null_to_empty
                        json[replaced_key] = ""
                    end
                    Fluent::Engine.emit(@output_tag, time, json)
                }
            end
        end
    }
end

#reassemble(record) ⇒ Object 



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

def reassemble(record)
    json = {}
    @reassemble_conf.each { |conf| 
        extract_key = conf[:extract]
        replaced_key = conf[:replace]
        operation = conf[:operation]
        val = convert(traverse(record, extract_key), operation)
        if !(val.nil?)
            json[replaced_key] = val
        elsif @null_to_null
            json[replaced_key] = nil
        elsif @null_to_empty
            json[replaced_key] = ""
        end
    }
    return json
end

#traverse(data, key) ⇒ Object 



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# File 'lib/fluent/plugin/out_reassemble.rb', line 102

def traverse(data, key)
    val = data
    key.split('.').each{ |k|
        if val.is_a?(Hash) && val.has_key?(k)
            val = val[k]
        else
            return nil
        end
    }
    return val
end