Class: Plugin::RecordModifierOutput::DynamicExpander

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(param_key, param_value, prepare_value) ⇒ DynamicExpander

Returns a new instance of DynamicExpander.



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# File 'lib/fluent/plugin/out_record_modifier.rb', line 199

def initialize(param_key, param_value, prepare_value)
  if param_value.include?('${')
    __str_eval_code__ = parse_parameter(param_value)

    # Use class_eval with string instead of define_method for performance.
    # It can't share instructions but this is 2x+ faster than define_method in filter case.
    # Refer: http://tenderlovemaking.com/2013/03/03/dynamic_method_definitions.html
    (class << self; self; end).class_eval "      def expand(tag, time, record, tag_parts)\n        \#{__str_eval_code__}\n      end\n    EORUBY\n  else\n    @param_value = param_value\n  end\n\n  begin\n    eval prepare_value if prepare_value\n  rescue SyntaxError\n    raise ConfigError, \"Pass invalid syntax parameter : key = prepare_value, value = \#{prepare_value}\"\n  end\n\n  begin\n    # check eval genarates wrong code or not\n    expand(nil, nil, nil, nil)\n  rescue SyntaxError\n    raise ConfigError, \"Pass invalid syntax parameter : key = \#{param_key}, value = \#{param_value}\"\n  rescue\n    # Ignore other runtime errors\n  end\nend\n",  __FILE__, __LINE__ + 1

Instance Attribute Details

#param_value ⇒ Object (readonly)

Returns the value of attribute param_value.



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# File 'lib/fluent/plugin/out_record_modifier.rb', line 197

def param_value
  @param_value
end

Instance Method Details

#expand(tag, time, record, tag_parts) ⇒ Object

Default implementation for fixed value. This is overwritten when parameter contains ‘$xxx’ placeholder



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# File 'lib/fluent/plugin/out_record_modifier.rb', line 232

def expand(tag, time, record, tag_parts)
  @param_value
end