Class: LogStash::Filters::Elasticsearch::DslExecutor

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/filters/elasticsearch/dsl_executor.rb

Instance Method Summary collapse

Constructor Details

#initialize(plugin, logger) ⇒ DslExecutor

Returns a new instance of DslExecutor.



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# File 'lib/logstash/filters/elasticsearch/dsl_executor.rb', line 7

def initialize(plugin, logger)
  @index = plugin.params["index"]
  @query = plugin.params["query"]
  @query_dsl = plugin.query_dsl
  @fields = plugin.params["fields"]
  @result_size = plugin.params["result_size"]
  @docinfo_fields = plugin.params["docinfo_fields"]
  @tag_on_failure = plugin.params["tag_on_failure"]
  @enable_sort = plugin.params["enable_sort"]
  @sort = plugin.params["sort"]
  @aggregation_fields = plugin.params["aggregation_fields"]
  @logger = logger
  @event_decorator = plugin.method(:decorate)
  @target_field = plugin.params["target"]
  if @target_field
    def self.apply_target(path); "[#{@target_field}][#{path}]"; end
  else
    def self.apply_target(path); path; end
  end
end

Instance Method Details

#process(client, event) ⇒ Object 



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# File 'lib/logstash/filters/elasticsearch/dsl_executor.rb', line 28

def process(client, event)
  matched = false
  begin
    params = { :index => event.sprintf(@index) }

    if @query_dsl
      query = LogStash::Json.load(event.sprintf(@query_dsl))
      params[:body] = query
    else
      query = event.sprintf(@query)
      params[:q] = query
      params[:size] = @result_size
      params[:sort] = @sort if @enable_sort
    end

    @logger.debug("Querying elasticsearch for lookup", :params => params)

    results = client.search(params)
    raise "Elasticsearch query error: #{results["_shards"]["failures"]}" if results["_shards"].include? "failures"

    event.set("[@metadata][total_hits]", extract_total_from_hits(results['hits']))

    result_hits = results["hits"]["hits"]
    if !result_hits.nil? && !result_hits.empty?
      matched = true
      @fields.each do |old_key, new_key|
        old_key_path = extract_path(old_key)
        extracted_hit_values = result_hits.map do |doc|
          extract_value(doc["_source"], old_key_path)
        end
        value_to_set = extracted_hit_values.count > 1 ? extracted_hit_values : extracted_hit_values.first
        set_to_event_target(event, new_key, value_to_set)
      end
      @docinfo_fields.each do |old_key, new_key|
        old_key_path = extract_path(old_key)
        extracted_docs_info = result_hits.map do |doc|
          extract_value(doc, old_key_path)
        end
        value_to_set = extracted_docs_info.count > 1 ? extracted_docs_info : extracted_docs_info.first
        set_to_event_target(event, new_key, value_to_set)
      end
    end

    result_aggregations = results["aggregations"]
    if !result_aggregations.nil? && !result_aggregations.empty?
      matched = true
      @aggregation_fields.each do |agg_name, ls_field|
        set_to_event_target(event, ls_field, result_aggregations[agg_name])
      end
    end

  rescue => e
    if @logger.trace?
      @logger.warn("Failed to query elasticsearch for previous event", :index => @index, :query => @query, :event => event.to_hash, :error => e.message, :backtrace => e.backtrace)
    elsif @logger.debug?
      @logger.warn("Failed to query elasticsearch for previous event", :index => @index, :error => e.message, :backtrace => e.backtrace)
    else
      @logger.warn("Failed to query elasticsearch for previous event", :index => @index, :error => e.message)
    end
    @tag_on_failure.each { |tag| event.tag(tag) }
  else
    @event_decorator.call(event) if matched
  end
end