Class: LogStash::Outputs::Status

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/outputs/status.rb

Constant Summary collapse

REJECTED_HEADERS =

useless headers puma adds to the requests mostly due to rack compliance

['puma.socket', 'rack.hijack?', 'rack.hijack', 'rack.url_scheme', 'rack.after_reply', 'rack.version', 'rack.errors', 'rack.multithread', 'rack.multiprocess', 'rack.run_once', 'SCRIPT_NAME', 'QUERY_STRING', 'SERVER_PROTOCOL', 'SERVER_SOFTWARE', 'GATEWAY_INTERFACE']
RESPONSE_HEADERS = 
{ 'Content-Type' => 'application/json' }

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#lastbeat ⇒ Object

Returns the value of attribute lastbeat.



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# File 'lib/logstash/outputs/status.rb', line 14

def lastbeat
  @lastbeat
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/logstash/outputs/status.rb', line 112

def close
  return unless @server
  @server.stop(true)
  @server.binder.close if @server.binder
rescue IOError
  # do nothing
end

#receive(_event) ⇒ Object 



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# File 'lib/logstash/outputs/status.rb', line 103

def receive(_event)
  'Event received'
  @mutex.synchronize do
    @lastbeat = _event
  end
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/status.rb', line 52

def register
  @mutex = Mutex.new
  @lastbeat = {}
  @server = ::Puma::Server.new(nil) # we'll set the rack handler later
  if @user && @password
    token = Base64.strict_encode64("#{@user}:#{@password.value}")
    @auth_token = "Basic #{token}"
  end
  if @ssl
    if @keystore.nil? || @keystore_password.nil?
      fail(LogStash::ConfigurationError, 'Settings :keystore and :keystore_password are required because :ssl is enabled.')
    end
    ctx = Puma::MiniSSL::Context.new
    ctx.keystore = @keystore
    ctx.keystore_pass = @keystore_password.value
    @server.add_ssl_listener(@host, @port, ctx)
  else
    @server.add_tcp_listener(@host, @port)
  end
  @server.min_threads = 0
  @server.max_threads = @threads

  # proc needs to be defined at this context
  # to capture @codecs, @logger and lowercase_keys
  p = proc do |req|
    begin
      remote_host = req['puma.socket'].peeraddr[3]
      REJECTED_HEADERS.each { |k| req.delete(k) }
      body = req.delete('rack.input')
      last = @lastbeat.clone
      last['@delta'] = Time.new - last['@timestamp'].time
      ['200', RESPONSE_HEADERS, [last.to_json]]
    rescue => e
      @logger.error("unable to process event #{req.inspect}. exception => #{e.inspect}")
      ['500', RESPONSE_HEADERS, ['internal error']]
    end
  end

  auth = proc do |username, password|
    username == @user && password == @password.value
  end if @user && @password

  @server.app = Rack::Builder.new do
    use(Rack::Auth::Basic, &auth) if auth
    run(p)
  end
  @server.run
end