I'd like to support mixin for my Fluentd Plugins. But It won't work. Would you please tell me the way to work fine? （FluentdプラグインのMixin対応を行おうとしているが、期待した動作にならない訳は何故でしょうか。）

fluentd-mixin-example.txt

### Test Run Command（テスト実行したコマンド）
curl http://localhost:8888/test -F 'json={"message":"foo"}'

### actual logging output（実際のログ出力）
2013-03-06 00:14:53 +0900 debug.mixin: {"message":"foo"}

### expected logging output（期待したログ出力）
2013-03-06 00:14:53 +0900 debug.mixin: {"message":"foo","my_tag":"test","my_time":"2013-03-05T15:14:53Z"}

fluentd.conf

<source>
  type http
  port 8888
</source>

<match test>
  type rewrite_tag_filter
  rewriterule1 message .+ debug.mixin
  include_time_key true
  time_key my_time
  include_tag_key true
  tag_key my_tag
</match>

out_rewrite_tag_filter.diff

diff --git a/lib/fluent/plugin/out_rewrite_tag_filter.rb b/lib/fluent/plugin/out_rewrite_tag_filter.rb
index eec8e4f..890ceba 100644
--- a/lib/fluent/plugin/out_rewrite_tag_filter.rb
+++ b/lib/fluent/plugin/out_rewrite_tag_filter.rb
@@ -1,6 +1,14 @@
 class Fluent::RewriteTagFilterOutput < Fluent::Output
   Fluent::Plugin.register_output('rewrite_tag_filter', self)
 
+  include Fluent::HandleTagNameMixin
+
+  include Fluent::SetTagKeyMixin
+  config_set_default :include_tag_key, true
+
+  include Fluent::SetTimeKeyMixin
+  config_set_default :include_time_key, true
+
   PATTERN_MAX_NUM = 200
 
   config_param :rewriterule1, :string # string: NAME REGEXP

After I added filter_record() before emit call, it works fine. Thank you.

@@ -53,7 +61,9 @@ class Fluent::RewriteTagFilterOutput < Fluent::Output
         tag = rewritetag.gsub(/\$\d+/, backreference_table)
         break
       end
-      Fluent::Engine.emit(tag, time, record) if (rewrite)
+      next unless rewrite
+      filter_record(tag, time, record)
+      Fluent::Engine.emit(tag, time, record)
     end