Class: LogStash::Inputs::Vespa

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/inputs/vespa.rb

Overview

This is the logstash vespa input plugin. It is used to read from Vespa via Visit : docs.vespa.ai/en/reference/document-v1-api-reference.html#visit Each document becomes an event.

Instance Method Summary collapse

Instance Method Details

#fetch_documents_from_vespa(uri) ⇒ Object

def run



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# File 'lib/logstash/inputs/vespa.rb', line 131

def fetch_documents_from_vespa(uri)
  http = Net::HTTP.new(uri.host, uri.port)
  if uri.scheme == "https"
    http.use_ssl = true
    http.cert = @cert
    http.key = @key
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  end

  request = Net::HTTP::Get.new(uri.request_uri)
  http.request(request)
rescue => e
    @logger.error("Failed to make HTTP request to Vespa", :error => e.message)
    nil
end

#parse_response(response) ⇒ Object

def fetch_documents_from_vespa



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# File 'lib/logstash/inputs/vespa.rb', line 147

def parse_response(response)
  JSON.parse(response.body)
rescue JSON::ParserError => e
  @logger.error("Failed to parse JSON response", :error => e.message)
  nil
end

#process_documents(documents, queue) ⇒ Object

def parse_response



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# File 'lib/logstash/inputs/vespa.rb', line 154

def process_documents(documents, queue)
  documents.each do |document|
    event = LogStash::Event.new(document)
    decorate(event)
    queue << event
  end
end

#register ⇒ Object 



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# File 'lib/logstash/inputs/vespa.rb', line 51

def register
  if @client_cert != nil
    @cert = OpenSSL::X509::Certificate.new(File.read(@client_cert))
  end
  if @client_key != nil
    @key = OpenSSL::PKey::RSA.new(File.read(@client_key))
  end

  if @client_cert.nil? ^ @client_key.nil?
    raise LogStash::ConfigurationError, "Both client_cert and client_key must be set, you can't have just one"
  end
  
  @uri_params = {
    :cluster => @cluster,
    :wantedDocumentCount => @page_size,
    :concurrency => @backend_concurrency,
    :timeout => @timeout
  }

  if @selection != nil
    @uri_params[:selection] = @selection
  end

  if @from_timestamp != nil
    @uri_params[:fromTimestamp] = @from_timestamp
  end

  if @to_timestamp != nil
    @uri_params[:toTimestamp] = @to_timestamp
  end
end

#run(queue) ⇒ Object

def register



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# File 'lib/logstash/inputs/vespa.rb', line 83

def run(queue)
  uri = URI.parse("#{@vespa_url}/document/v1/")
  uri.query = URI.encode_www_form(@uri_params)
  continuation = nil

  loop do
    response = fetch_documents_from_vespa(uri)
    # response should look like:
    # {
    #   "pathId":"/document/v1/","documents":[
    #     {"id":"id:namespace:doctype::docid","fields":{"field1":"value1","field2":7.0}}
    #   ],
    #   "documentCount":1,"continuation":"continuation_string"
    # }

    if response.is_a?(Net::HTTPSuccess)
      response_parsed = parse_response(response)
      break unless response_parsed

      document_count = response_parsed["documentCount"]
      # record the continuation token for the next request (if it exists)
      continuation = response_parsed["continuation"]
      documents = response_parsed["documents"]

      process_documents(documents, queue)

      # Exit the loop if there are no more documents to process
      if continuation != nil
        uri.query = URI.encode_www_form(@uri_params.merge({:continuation => continuation}))
      else
        @logger.info("No continuation ID => no more documents to fetch from Vespa")
        break
      end

      if @stopping
        @logger.info("Stopping Vespa input")
        break
      end

    else
      @logger.error("Failed to fetch documents from Vespa", :request => uri.to_s,
                    :response_code => response.code, :response_message => response.message)
      break # TODO retry? Only on certain codes?
    end # if response.is_a?(Net::HTTPSuccess)

  end # loop do
end

#stop ⇒ Object

def process_documents



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# File 'lib/logstash/inputs/vespa.rb', line 162

def stop
  @stopping = true
end