Class: LogStash::Filters::Javascript

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/filters/javascript.rb

Defined Under Namespace

Classes: Script, ScriptError

Instance Method Summary collapse

Constructor Details

#initialize(*params) ⇒ Javascript

Flag for add exception message to tag_on_exception config :tag_with_exception_message, :type => :boolean, :default => false



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# File 'lib/logstash/filters/javascript.rb', line 46

def initialize(*params)
  super(*params)
  @script = Script.new(nil, init_parameters, logger)
  @script.js_eval @init if @init
  @js_filter = nil
end

Instance Method Details

#filter(event, &block) ⇒ Object 



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# File 'lib/logstash/filters/javascript.rb', line 84

def filter(event, &block)
  java_event = event.to_java
  begin
    js_return = @script.js_call(@js_filter, java_event)
    filter_matched(event)
  rescue => e
    @logger.error("could not process event due:", error_details(e))
    tag_exception(event, e)
    return event
  end
  event.cancel unless filter_results(java_event, js_return, &block)
end

#register ⇒ Object 



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# File 'lib/logstash/filters/javascript.rb', line 53

def register
  @js_filter = nil # TODO: devutils' sample helper causes plugin.register to happen twice

  if @path
    @path.each { |path| @script.js_eval(::File.read(path), path: path) }
    @js_filter = @script.get('filter') # `expecting a `function filter(event) {}`
    if @js_filter.nil?
      raise ScriptError, "script at '#{@path}' does not define a filter(event) function" if @code.nil?
    else
      if @js_filter.is_a?(ScriptObjectMirror)
        unless @js_filter.isFunction
          raise ScriptError, "script at '#{@path}' defines a 'filter' property that isn't a function (got type: #{@js_filter.getClassName})"
        end
      else
        raise ScriptError, "script at '#{@path}' defines a 'filter' property that isn't a function (got value: #{@js_filter.inspect})"
      end
    end
  end

  if @code
    if @js_filter
      msg = "Script(s) provided by 'path' defined a filter function while 'code' => ... is also set, this is ambiguous!"
      @logger.error(msg); raise LogStash::ConfigurationError.new(msg)
    end

    @js_filter = @script.js_eval(@code) { "(function filter(event) {\n#{@code} } )" } # jdk.nashorn.api.scripting.JSObject
  end

  @script.verify
end