Class: Fluent::LogentriesOutput

Inherits:
BufferedOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_logentries.rb

Defined Under Namespace

Classes: ConnectionFailure

Constant Summary collapse

SSL_HOST = 
"api.logentries.com"
NO_SSL_HOST = 
"data.logentries.com"

Instance Method Summary collapse

Instance Method Details

#client ⇒ Object 



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# File 'lib/fluent/plugin/out_logentries.rb', line 37

def client
  @_socket ||= if @use_ssl
    context    = OpenSSL::SSL::SSLContext.new
    socket     = TCPSocket.new SSL_HOST, @port
    ssl_client = OpenSSL::SSL::SSLSocket.new socket, context

    ssl_client.connect
  else
    if @protocol == 'tcp'
      TCPSocket.new NO_SSL_HOST, @port
    else
      udp_client = UDPSocket.new
      udp_client.connect NO_SSL_HOST, @port

      udp_client
    end
  end
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_logentries.rb', line 22

def configure(conf)
  super

  @tokens    = nil
  @last_edit = Time.at(0)
end

#format(tag, time, record) ⇒ Object

This method is called when an event reaches Fluentd.



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# File 'lib/fluent/plugin/out_logentries.rb', line 57

def format(tag, time, record)
  return [tag, record].to_msgpack
end

#generate_tokens_list ⇒ Object

Parse an YML file and generate a list of tokens. It will only re-generate the list on changes.



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# File 'lib/fluent/plugin/out_logentries.rb', line 63

def generate_tokens_list
  begin
    edit_time = File.mtime(@config_path)

    if edit_time > @last_edit
      @tokens    = YAML::load_file(@config_path)
      @last_edit = edit_time

      log.info "Token(s) list updated."
    end
  rescue Exception => e
    log.warn "Could not load configuration. #{e.message}"
  end
end

#get_token(tag, record) ⇒ Object

Returns the correct token to use for a given tag / records



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# File 'lib/fluent/plugin/out_logentries.rb', line 79

def get_token(tag, record)
  app_name = record["app_name"] || ''

  # Config Structure
  # -----------------------
  # app-name:
  #   app: TOKEN
  #   access: TOKEN (optional)
  #   error: TOKEN  (optional)
  @tokens.each do |key, value|
    if app_name == key || tag.index(key) != nil
      default = value['app']

      case tag
        when @tag_access_log
          return value['access'] || default
        when @tag_error_log
          return value['error']  || default

        else
          return default
      end
    end
  end

  return nil
end

#send_logentries(token, data) ⇒ Object 



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

def send_logentries(token, data)
  retries = 0
  begin
    client.write("#{token} #{data} \n")
  rescue Errno::ECONNREFUSED, Errno::ETIMEDOUT => e
    if retries < @max_retries
      retries += 1
      @_socket = nil
      log.warn "Could not push logs to Logentries, resetting connection and trying again. #{e.message}"
      sleep 5**retries
      retry
    end
    raise ConnectionFailure, "Could not push logs to Logentries after #{retries} retries. #{e.message}"
  rescue Errno::EMSGSIZE
    str_length = data.length
    send_logentries(token, data[0..str_length/2])
    send_logentries(token, data[(str_length/2)+1..str_length])

    log.warn "Message Too Long, re-sending it in two part..."
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_logentries.rb', line 33

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_logentries.rb', line 29

def start
  super
end

#write(chunk) ⇒ Object

NOTE! This method is called by internal thread, not Fluentd’s main thread. So IO wait doesn’t affect other plugins.



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# File 'lib/fluent/plugin/out_logentries.rb', line 108

def write(chunk)
  generate_tokens_list()
  return unless @tokens.is_a? Hash

  chunk.msgpack_each do |tag, record|
    next unless record.is_a? Hash
    next unless record.has_key? "message"

    token = get_token(tag, record)
    next if token.nil?

    # Clean up the string to avoid blank line in logentries
    message = record["message"].rstrip()
    send_logentries(token, message)

  end
end