Class: Fluent::KafkaRestOutput

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ KafkaRestOutput

Returns a new instance of KafkaRestOutput.



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 4

def initialize
  super
  require 'net/https'
  require 'openssl'
  require 'uri'
  require 'yajl'
  require 'base64'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 43

def configure(conf)
  super

  @use_ssl = conf['use_ssl']
  @include_tag = conf['include_tag']
  @include_timestamp = conf['include_timestamp']

  serializers = [:json_bin]  # Should support :avro in the future
  @serializer = if serializers.include? @serializer.intern
                  @serializer.intern
                else
                  :json_bin
                end

  @content_type = conf['content_type']

  # Kafka REST Proxy accepts only POST method at the moment
  http_methods = [:post]
  @http_method = if http_methods.include? @http_method.intern
                  @http_method.intern
                else
                  :post
                end

  @auth = case @authentication
          when 'basic' then :basic
          else
            :none
          end
end

#create_request(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 117

def create_request(tag, time, record)
  url = format_url(tag, time, record)
  uri = URI.parse(url)
  req = Net::HTTP.const_get(@http_method.to_s.capitalize).new(uri.path)
  set_body(req, tag, time, record)
  set_header(req, tag, time, record)
  return req, uri
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 164

def emit(tag, es, chain)
  es.each do |time, record|
    handle_record(tag, time, record)
  end
  chain.next
end

#format_url(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 82

def format_url(tag, time, record)
  @endpoint_url
end

#handle_record(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 159

def handle_record(tag, time, record)
  req, uri = create_request(tag, time, record)
  send_request(req, uri)
end

#send_request(req, uri) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 126

def send_request(req, uri)    
  is_rate_limited = (@rate_limit_msec != 0 and not @last_request_time.nil?)
  if is_rate_limited and ((Time.now.to_f - @last_request_time) * 1000.0 < @rate_limit_msec)
    $log.info('Dropped request due to rate limiting')
    return
  end
  
  res = nil
  begin
    if @auth and @auth == :basic
      req.basic_auth(@username, @password)
    end
    @last_request_time = Time.now.to_f
    https = Net::HTTP.new(uri.host, uri.port)
    https.use_ssl = @use_ssl
    https.ca_file = OpenSSL::X509::DEFAULT_CERT_FILE 
#      https.verify_mode = OpenSSL::SSL::VERIFY_PEER
    https.verify_mode = OpenSSL::SSL::VERIFY_NONE
    res = https.start {|http| http.request(req) }
  rescue IOError, EOFError, SystemCallError
    # server didn't respond
    $log.warn "Net::HTTP.#{req.method.capitalize} raises exception: #{$!.class}, '#{$!.message}'"
  end
  unless res and res.is_a?(Net::HTTPSuccess)
    res_summary = if res
                    "#{res.code} #{res.message} #{res.body}"
                  else
                    "res=nil"
                  end
    $log.warn "failed to #{req.method} #{uri} (#{res_summary})"
  end
end

#set_avro_body(req, data) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 113

def set_avro_body(req, data)
  # TODO: Implement avro body parser
end

#set_body(req, tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 86

def set_body(req, tag, time, record)
  # TODO: Add avro support
  if @include_tag
    record['tag'] = tag
  end
  if @include_timestamp
    record['timestamp'] = Time.now.to_i
  end 
  if @serializer == :json_bin
    set_json_body(req, record)
  # elsif @serializer == :avro
  #   set_avro_body(req, record)
  end
  req
end

#set_header(req, tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 102

def set_header(req, tag, time, record)
  req
end

#set_json_body(req, data) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 106

def set_json_body(req, data)
  dumped_data = Yajl.dump(data)
  encoded_data = Base64.encode64(dumped_data)
  req.body = Yajl.dump({ "records" => [{ "value" => encoded_data }] })
  req['Content-Type'] = 'application/vnd.kafka.binary.v1+json'
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 78

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_rest.rb', line 74

def start
  super
end