Class: LogStash::Search::ElasticSearch

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/search/elasticsearch.rb

Instance Method Summary collapse

Methods inherited from Base

#count, #popular_terms

Constructor Details

#initialize(settings = {}) ⇒ ElasticSearch

Returns a new instance of ElasticSearch.



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# File 'lib/logstash/search/elasticsearch.rb', line 14

def initialize(settings={})
  @host = (settings[:host] || "localhost")
  @port = (settings[:port] || 9200).to_i
  @logger = LogStash::Logger.new(STDOUT)
end

Instance Method Details

#histogram(query, field, interval = nil) ⇒ Object 



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# File 'lib/logstash/search/elasticsearch.rb', line 95

def histogram(query, field, interval=nil)
  if query.is_a?(String)
    query = LogStash::Search::Query.parse(query)
  end

  # TODO(sissel): only search a specific index?
  http = EventMachine::HttpRequest.new("http://#{@host}:#{@port}/_search")

  @logger.info(["Query", query])
  histogram_settings = {
    "field" => field
  }

  if !interval.nil? && interval.is_a?(Numeric)
    histogram_settings["interval"] = interval
  end

  esreq = {
    "query" => {
      "query_string" => { 
         "query" => query.query_string,
         "default_operator" => "AND"
      } # query_string
    }, # query
    "from" => 0,
    "size" => 0,
    "facets" => {
      "amazingpants" => { # just a name for this histogram...
        "histogram" => histogram_settings,
      },
    },
  } # elasticsearch request

  @logger.info("ElasticSearch Facet Query: #{esreq.to_json}")
  start_time = Time.now
  req = http.get :body => esreq.to_json
  result = LogStash::Search::FacetResult.new
  req.callback do
    data = JSON.parse(req.response)
    result.duration = Time.now - start_time

    @logger.info(["Got search results", 
                 { :query => query.query_string, :duration => data["duration"] }])
    if req.response_header.status != 200
      result.error_message = data["error"] || req.inspect
      @error = data["error"] || req.inspect
    end

    entries = data["facets"]["amazingpants"]["entries"] rescue nil

    if entries.nil? or !data["error"].nil?
      # Use the error message if any, otherwise, return the whole
      # data object as json as the error message for debugging later.
      result.error_message = (data["error"] rescue false) || data.to_json
      yield result
      next
    end
    entries.each do |entry|
      # entry is a hash of keys 'total', 'mean', 'count', and 'key'
      hist_entry = LogStash::Search::FacetResult::Histogram.new
      hist_entry.key = entry["key"]
      hist_entry.count = entry["count"]
      result.results << hist_entry
    end # for each histogram result
    yield result
  end # request callback

  req.errback do 
    @logger.warn(["Query failed", query, req, req.response])
    result.duration = Time.now - start_time
    result.error_message = req.response
    yield result
    #yield({ "error" => req.response })
  end
end

#search(query) ⇒ Object 



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# File 'lib/logstash/search/elasticsearch.rb', line 22

def search(query)
  raise "No block given for search call." if !block_given?
  if query.is_a?(String)
    query = LogStash::Search::Query.parse(query)
  end

  # TODO(sissel): only search a specific index?
  http = EventMachine::HttpRequest.new("http://#{@host}:#{@port}/_search")

  @logger.info(["Query", query])
  esreq = {
    "sort" => [
      { "@timestamp" => "desc" }
    ],
    "query" => {
      "query_string" => { 
         "query" => query.query_string,
         "default_operator" => "AND"
      } # query_string
    }, # query
    "from" => query.offset,
    "size" => query.count
  } # elasticsearch request

  @logger.info("ElasticSearch Query: #{esreq.to_json}")
  start_time = Time.now
  req = http.get :body => esreq.to_json
  result = LogStash::Search::Result.new
  req.callback do
    data = JSON.parse(req.response)
    result.duration = Time.now - start_time

    hits = data["hits"]["hits"] rescue nil

    if hits.nil? or !data["error"].nil?
      # Use the error message if any, otherwise, return the whole
      # data object as json as the error message for debugging later.
      result.error_message = (data["error"] rescue false) || data.to_json
      yield result
      next
    end

    @logger.info(["Got search results", 
                 { :query => query.query_string, :duration => data["duration"],
                   :result_count => hits.size }])
    if req.response_header.status != 200
      result.error_message = data["error"] || req.inspect
      @error = data["error"] || req.inspect
    end

    # We want to yield a list of LogStash::Event objects.
    hits.each do |hit|
      result.events << LogStash::Event.new(hit["_source"])
    end

    # Total hits this search could find if not limited
    result.total = data["hits"]["total"]
    result.offset = query.offset

    yield result
  end

  req.errback do 
    @logger.warn(["Query failed", query, req, req.response])
    result.duration = Time.now - start_time
    result.error_message = req.response

    yield result
  end
end