Port parser filter from fluent-plugin-parser. fix #1189

lib/fluent/plugin/filter_parser.rb

@@ -0,0 +1,108 @@
+#
+# Fluentd
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+#
+
+require 'fluent/time'
+require 'fluent/config/error'
+require 'fluent/plugin/filter'
+require 'fluent/plugin_helper/parser'
+require 'fluent/plugin_helper/compat_parameters'
+
+module Fluent::Plugin
+  class ParserFilter < Filter
+    Fluent::Plugin.register_filter('parser', self)
+
+    helpers :parser, :compat_parameters
+
+    config_param :key_name, :string
+    config_param :reserve_data, :bool, default: false
+    config_param :reserve_time, :bool, default: false
+    config_param :inject_key_prefix, :string, default: nil
+    config_param :replace_invalid_sequence, :bool, default: false
+    config_param :hash_value_field, :string, default: nil
+
+    attr_reader :parser
+
+    def configure(conf)
+      compat_parameters_convert(conf, :parser)
+
+      super
+
+      @parser = parser_create
+    end
+
+    FAILED_RESULT = [nil, nil].freeze # reduce allocation cost
+    REPLACE_CHAR = '?'.freeze
+
+    def filter_with_time(tag, time, record)
+      raw_value = record[@key_name]
+      if raw_value.nil?
+        router.emit_error_event(tag, time, record, ArgumentError.new("#{@key_name} does not exist"))
+        if @reserve_data
+          return time, handle_parsed(tag, record, time, {})
+        else
+          return FAILED_RESULT
+        end
+      end
+      begin
+        @parser.parse(raw_value) do |t, values|
+          if values
+            t = if @reserve_time
+                  time
+                else
+                  t.nil? ? time : t
+                end
+            r = handle_parsed(tag, record, t, values)
+            return t, r
+          else
+            router.emit_error_event(tag, time, record, Fluent::Plugin::Parser::ParserError.new("pattern not match with data '#{raw_value}'"))
+            if @reserve_data
+              t = time
+              r = handle_parsed(tag, record, time, {})
+              return t, r
+            else
+              return FAILED_RESULT
+            end
+          end
+        end
+      rescue Fluent::Plugin::Parser::ParserError => e
+        router.emit_error_event(tag, time, record, e)
+        return FAILED_RESULT
+      rescue ArgumentError => e
+        raise unless @replace_invalid_sequence
+        raise unless e.message.index("invalid byte sequence in") == 0
+
+        raw_value = raw_value.scrub(REPLACE_CHAR)
+        retry
+      rescue => e
+        router.emit_error_event(tag, time, record, Fluent::Plugin::Parser::ParserError.new("parse failed #{e.message}"))
+        return FAILED_RESULT
+      end
+    end
+
+    private
+
+    def handle_parsed(tag, record, t, values)
+      if values && @inject_key_prefix
+        values = Hash[values.map { |k, v| [@inject_key_prefix + k, v] }]
+      end
+      r = @hash_value_field ? {@hash_value_field => values} : values
+      if @reserve_data
+        r = r ? record.merge(r) : record
+      end
+      r
+    end
+  end
+end

lib/fluent/plugin_helper/compat_parameters.rb

@@ -52,12 +52,13 @@ module CompatParameters
         "types" => nil,
         "types_delimiter" => nil,
         "types_label_delimiter" => nil,
-        "null_value_pattern" => "null_value_pattern",
-        "null_empty_string" => "null_empty_string",
         "keys" => "keys", # CSVParser, TSVParser (old ValuesParser)
         "time_key"    => "time_key",
         "time_format" => "time_format",
         "delimiter"   => "delimiter",
+        "keep_time_key" => "keep_time_key",
+        "null_empty_string" => "null_empty_string",
+        "null_value_pattern" => "null_value_pattern",
         "json_parser"      => "json_parser", # JSONParser
         "label_delimiter"  => "label_delimiter", # LabeledTSVParser
         "format_firstline" => "format_firstline", # MultilineParser