allow yaml parser and visitor to be garbage collected

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 3.4.3
+  - Allow YamlFile's Psych::Parser and Visitor instances to be garbage collected [#104](https://github.com/logstash-plugins/logstash-filter-translate/pull/104)
+
 ## 3.4.2
   - Fixed JRuby 9.4 compatibility issue[#98](https://github.com/logstash-plugins/logstash-filter-translate/pull/98)
 

lib/logstash/filters/dictionary/yaml_file.rb

@@ -8,19 +8,19 @@ class YamlFile < File
     protected
 
     def initialize_for_file_type(**file_type_args)
-      @visitor = YamlVisitor.create
-
-      @parser = Psych::Parser.new(Psych::TreeBuilder.new)
-      @parser.code_point_limit = file_type_args[:yaml_code_point_limit]
+      @yaml_code_point_limit = file_type_args[:yaml_code_point_limit]
     end
 
     def read_file_into_dictionary
+      visitor = YamlVisitor.create
+      parser = Psych::Parser.new(Psych::TreeBuilder.new)
+      parser.code_point_limit = @yaml_code_point_limit
       # low level YAML read that tries to create as
       # few intermediate objects as possible
       # this overwrites the value at key
       yaml_string = IO.read(@dictionary_path, :mode => 'r:bom|utf-8')
-      @parser.parse(yaml_string, @dictionary_path)
-      @visitor.accept_with_dictionary(@dictionary, @parser.handler.root)
+      parser.parse(yaml_string, @dictionary_path)
+      visitor.accept_with_dictionary(@dictionary, parser.handler.root)
     end
   end
 end end end

logstash-filter-translate.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-filter-translate'
-  s.version         = '3.4.2'
+  s.version         = '3.4.3'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Replaces field contents based on a hash or YAML file"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"