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Contents
# encoding: utf-8
require "logstash/namespace"
require "logstash/event"
require "logstash/plugin"
require "logstash/logging"
# This is the base class for logstash codecs.
module LogStash::Codecs; class Base < LogStash::Plugin
include LogStash::Config::Mixin
config_name "codec"
def initialize(params={})
super
config_init(@params)
register if respond_to?(:register)
setup_multi_encode!
end
public
def decode(data)
raise "#{self.class}#decode must be overidden"
end # def decode
alias_method :<<, :decode
public
# DEPRECATED: Prefer defining encode_sync or multi_encode
def encode(event)
encoded = multi_encode([event])
encoded.each {|event,data| @on_event.call(event,data) }
end # def encode
public
# Relies on the codec being synchronous (which they all are!)
# We need a better long term design here, but this is an improvement
# over the current API for shared plugins
# It is best if the codec implements this directly
def multi_encode(events)
if @has_encode_sync
events.map {|event| [event, self.encode_sync(event)]}
else
batch = Thread.current[:logstash_output_codec_batch] ||= []
batch.clear
events.each {|event| self.encode(event) }
batch
end
end
def setup_multi_encode!
@has_encode_sync = self.methods.include?(:encode_sync)
on_event do |event, data|
Thread.current[:logstash_output_codec_batch] << [event, data]
end
end
public
def close; end;
# @param block [Proc(event, data)] the callback proc passing the original event and the encoded event
public
def on_event(&block)
@on_event = block
end
public
def flush(&block)
# does nothing by default.
# if your codec needs a flush method (like you are spooling things)
# you must implement this.
end
public
def clone
return self.class.new(params)
end
end; end # class LogStash::Codecs::Base
Version data entries
10 entries across 10 versions & 3 rubygems