Class: LogStash::Outputs::Http

Inherits:
Base
  • Object
show all
Includes:
PluginMixins::HttpClient
Defined in:
lib/logstash/outputs/http.rb

Defined Under Namespace

Classes: RetryTimerTask

Constant Summary collapse

VALID_METHODS = 
["put", "post", "patch", "delete", "get", "head"]
RETRYABLE_MANTICORE_EXCEPTIONS = 
[
  ::Manticore::Timeout,
  ::Manticore::SocketException,
  ::Manticore::ClientProtocolException,
  ::Manticore::ResolutionFailure,
  ::Manticore::SocketTimeout
]
RETRYABLE_UNKNOWN_EXCEPTION_STRINGS = 
[
  /Connection reset by peer/i,
  /Read Timed out/i
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#is_batch ⇒ Object

Returns the value of attribute is_batch.



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

def is_batch
  @is_batch
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 286

def close
  @timer.cancel
  client.close
end

#log_error_response(response, url, event) ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 155

def log_error_response(response, url, event)
  log_failure(
            "Encountered non-2xx HTTP code #{response.code}",
            :response_code => response.code,
            :url => url,
            :event => event
          )
end

#log_retryable_response(response) ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 146

def log_retryable_response(response)
  retry_msg = @retry_failed ? 'will retry' : "won't retry"
  if (response.code == 429)
    @logger.debug? && @logger.debug("Encountered a 429 response, #{retry_msg}. This is not serious, just flow control via HTTP")
  else
    @logger.warn("Encountered a retryable HTTP request in HTTP output, #{retry_msg}", :code => response.code, :body => response.body)
  end
end

#multi_receive(events) ⇒ Object

def register



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# File 'lib/logstash/outputs/http.rb', line 128

def multi_receive(events)
  return if events.empty?
  send_events(events)
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 97

def register
  @http_method = @http_method.to_sym

  # We count outstanding requests with this queue
  # This queue tracks the requests to create backpressure
  # When this queue is empty no new requests may be sent,
  # tokens must be added back by the client on success
  @request_tokens = SizedQueue.new(@pool_max)
  @pool_max.times {|t| @request_tokens << true }

  @requests = Array.new

  if @content_type.nil?
    case @format
      when "form" ; @content_type = "application/x-www-form-urlencoded"
      when "json" ; @content_type = "application/json"
      when "json_batch" ; @content_type = "application/json"
      when "message" ; @content_type = "text/plain"
    end
  end

  @is_batch = @format == "json_batch"

  @headers["Content-Type"] = @content_type

  validate_format!

  # Run named Timer as daemon thread
  @timer = java.util.Timer.new("HTTP Output #{self.params['id']}", true)
end

#send_event(event, attempt) ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 232

def send_event(event, attempt)
  body = event_body(event)

  # Send the request
  url = @is_batch ? @url : event.sprintf(@url)
  headers = @is_batch ? @headers : event_headers(event)

  # Compress the body and add appropriate header
  if @http_compression == true
    headers["Content-Encoding"] = "gzip"
    body = gzip(body)
  end

  # Create an async request
  response = client.send(@http_method, url, :body => body, :headers => headers).call

  if !response_success?(response)
    if retryable_response?(response)
      log_retryable_response(response)
      return :retry, event, attempt
    else
      log_error_response(response, url, event)
      return :failure, event, attempt
    end
  else
    return :success, event, attempt
  end

rescue => exception
  will_retry = retryable_exception?(exception)
  log_params = {
    :url => url,
    :method => @http_method,
    :message => exception.message,
    :class => exception.class.name,
    :will_retry => will_retry
  }
  if @logger.debug?
    # backtraces are big
    log_params[:backtrace] = exception.backtrace
    # headers can have sensitive data
    log_params[:headers] = headers
    # body can be big and may have sensitive data
    log_params[:body] = body
  end
  log_failure("Could not fetch URL", log_params)

  if will_retry
    return :retry, event, attempt
  else
    return :failure, event, attempt
  end
end

#send_events(events) ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 164

def send_events(events)
  successes = java.util.concurrent.atomic.AtomicInteger.new(0)
  failures  = java.util.concurrent.atomic.AtomicInteger.new(0)
  retries = java.util.concurrent.atomic.AtomicInteger.new(0)
  event_count = @is_batch ? 1 : events.size

  pending = Queue.new
  if @is_batch
    pending << [events, 0]
  else
    events.each {|e| pending << [e, 0]}
  end

  while popped = pending.pop
    break if popped == :done

    event, attempt = popped

    action, event, attempt = send_event(event, attempt)
    begin
      action = :failure if action == :retry && !@retry_failed

      case action
      when :success
        successes.incrementAndGet
      when :retry
        retries.incrementAndGet

        next_attempt = attempt+1
        sleep_for = sleep_for_attempt(next_attempt)
        @logger.info("Retrying http request, will sleep for #{sleep_for} seconds")
        timer_task = RetryTimerTask.new(pending, event, next_attempt)
        @timer.schedule(timer_task, sleep_for*1000)
      when :failure
        failures.incrementAndGet
      else
        raise "Unknown action #{action}"
      end

      if action == :success || action == :failure
        if successes.get+failures.get == event_count
          pending << :done
        end
      end
    rescue => e
      # This should never happen unless there's a flat out bug in the code
      @logger.error("Error sending HTTP Request",
        :class => e.class.name,
        :message => e.message,
        :backtrace => e.backtrace)
      failures.incrementAndGet
      raise e
    end
  end
rescue => e
  @logger.error("Error in http output loop",
          :class => e.class.name,
          :message => e.message,
          :backtrace => e.backtrace)
  raise e
end

#sleep_for_attempt(attempt) ⇒ Object 



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# File 'lib/logstash/outputs/http.rb', line 226

def sleep_for_attempt(attempt)
  sleep_for = attempt**2
  sleep_for = sleep_for <= 60 ? sleep_for : 60
  (sleep_for/2) + (rand(0..sleep_for)/2)
end