Class: Fluent::Plugin::CloudwatchLogsOutput

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

Defined Under Namespace

Classes: TooLargeEventError

Constant Summary collapse

DEFAULT_BUFFER_TYPE = 
"memory"
MAX_EVENTS_SIZE = 
1_048_576
MAX_EVENT_SIZE = 
256 * 1024
EVENT_HEADER_SIZE = 
26

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CloudwatchLogsOutput

Returns a new instance of CloudwatchLogsOutput.



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 69

def initialize
  super

  require 'aws-sdk-cloudwatchlogs'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 75

def configure(conf)
  compat_parameters_convert(conf, :buffer, :inject)
  super

  unless [conf['log_group_name'], conf['use_tag_as_group'], conf['log_group_name_key']].compact.size == 1
    raise Fluent::ConfigError, "Set only one of log_group_name, use_tag_as_group and log_group_name_key"
  end

  unless [conf['log_stream_name'], conf['use_tag_as_stream'], conf['log_stream_name_key']].compact.size == 1
    raise Fluent::ConfigError, "Set only one of log_stream_name, use_tag_as_stream and log_stream_name_key"
  end

  if [conf['log_group_aws_tags'], conf['log_group_aws_tags_key']].compact.size > 1
    raise ConfigError, "Set only one of log_group_aws_tags, log_group_aws_tags_key"
  end

  if [conf['retention_in_days'], conf['retention_in_days_key']].compact.size > 1
    raise ConfigError, "Set only one of retention_in_days, retention_in_days_key"
  end

  formatter_conf = conf.elements('format').first
  @formatter_proc = unless formatter_conf
                      unless @message_keys.empty?
                        Proc.new { |tag, time, record|
                          @message_keys.map{|k| record[k].to_s }.reject{|e| e.empty? }.join(' ')
                        }
                      else
                        Proc.new { |tag, time, record|
                          @json_handler.dump(record)
                        }
                      end
                    else
                      formatter = formatter_create(usage: 'cloudwatch-logs-plugin', conf: formatter_conf)
                      formatter.method(:format)
                    end
end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 165

def format(tag, time, record)
  record = inject_values_to_record(tag, time, record)
  Fluent::MessagePackFactory.msgpack_packer.pack([tag, time, record]).to_s
end

#formatted_to_msgpack_binary? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 170

def formatted_to_msgpack_binary?
  true
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 174

def multi_workers_ready?
  true
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 112

def start
  super

  options = {}
  options[:logger] = log if log
  options[:log_level] = :debug if log
  options[:region] = @region if @region
  options[:endpoint] = @endpoint if @endpoint
  options[:instance_profile_credentials_retries] = @aws_instance_profile_credentials_retries if @aws_instance_profile_credentials_retries

  if @aws_use_sts
    Aws.config[:region] = options[:region]
    credentials_options = {
      role_arn: @aws_sts_role_arn,
      role_session_name: @aws_sts_session_name
    }
    credentials_options[:sts_endpoint_url] = @aws_sts_endpoint_url if @aws_sts_endpoint_url
    if @region and @aws_sts_endpoint_url
      credentials_options[:client] = Aws::STS::Client.new(:region => @region, endpoint: @aws_sts_endpoint_url)
    elsif @region
      credentials_options[:client] = Aws::STS::Client.new(:region => @region)
    end
    options[:credentials] = Aws::AssumeRoleCredentials.new(credentials_options)
  elsif @web_identity_credentials
    c = @web_identity_credentials
    credentials_options = {}
    credentials_options[:role_arn] = c.role_arn
    credentials_options[:role_session_name] = c.role_session_name
    credentials_options[:web_identity_token_file] = c.web_identity_token_file
    credentials_options[:policy] = c.policy if c.policy
    credentials_options[:duration_seconds] = c.duration_seconds if c.duration_seconds
    if @region
      credentials_options[:client] = Aws::STS::Client.new(:region => @region)
    end
    options[:credentials] = Aws::AssumeRoleWebIdentityCredentials.new(credentials_options)
  else
    options[:credentials] = Aws::Credentials.new(@aws_key_id, @aws_sec_key) if @aws_key_id && @aws_sec_key
  end
  options[:http_proxy] = @http_proxy if @http_proxy
  @logs ||= Aws::CloudWatchLogs::Client.new(options)
  @sequence_tokens = {}
  @store_next_sequence_token_mutex = Mutex.new

  log.debug "Aws::CloudWatchLogs::Client initialized: log.level #{log.level} => #{options[:log_level]}"

  @json_handler = case @json_handler
                  when :yajl
                    Yajl
                  when :json
                    JSON
                  end
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 178

def write(chunk)
  log_group_name = extract_placeholders(@log_group_name, chunk) if @log_group_name
  log_stream_name = extract_placeholders(@log_stream_name, chunk) if @log_stream_name
  aws_tags = @log_group_aws_tags.each {|k, v|
    @log_group_aws_tags[extract_placeholders(k, chunk)] = extract_placeholders(v, chunk)
  } if @log_group_aws_tags

  queue = Thread::Queue.new

  chunk.enum_for(:msgpack_each).select {|tag, time, record|
    if record.nil?
      log.warn "record is nil (tag=#{tag})"
      false
    else
      true
    end
  }.group_by {|tag, time, record|
    group = case
            when @use_tag_as_group
              tag
            when @log_group_name_key
              if @remove_log_group_name_key
                record.delete(@log_group_name_key)
              else
                record[@log_group_name_key]
              end
            else
              log_group_name
            end

    stream = case
             when @use_tag_as_stream
               tag
             when @log_stream_name_key
               if @remove_log_stream_name_key
                 record.delete(@log_stream_name_key)
               else
                 record[@log_stream_name_key]
               end
             else
               log_stream_name
             end

    [group, stream]
  }.each {|group_stream, rs|
    group_name, stream_name = group_stream

    if stream_name.nil?
      log.warn "stream_name is nil (group_name=#{group_name})"
      next
    end

    unless log_group_exists?(group_name)
      #rs = [[name, timestamp, record],[name,timestamp,record]]
      #get tags and retention from first record
      #as we create log group only once, values from first record will persist
      record = rs[0][2]

      awstags = aws_tags
      unless @log_group_aws_tags_key.nil?
        if @remove_log_group_aws_tags_key
          awstags = record.delete(@log_group_aws_tags_key)
        else
          awstags = record[@log_group_aws_tags_key]
        end
      end

      retention_in_days = @retention_in_days
      unless @retention_in_days_key.nil?
        if @remove_retention_in_days_key
          retention_in_days = record.delete(@retention_in_days_key)
        else
          retention_in_days = record[@retention_in_days_key]
        end
      end

      if @auto_create_stream
        create_log_group(group_name, awstags, retention_in_days)
      else
        log.warn "Log group '#{group_name}' does not exist"
        next
      end
    end

    unless log_stream_exists?(group_name, stream_name)
      if @auto_create_stream
        create_log_stream(group_name, stream_name)
      else
        log.warn "Log stream '#{stream_name}' does not exist"
        next
      end
    end

    events = []
    rs.each do |t, time, record|
      if @log_group_aws_tags_key && @remove_log_group_aws_tags_key
        record.delete(@log_group_aws_tags_key)
      end

      if @retention_in_days_key && @remove_retention_in_days_key
        record.delete(@retention_in_days_key)
      end

      record = drop_empty_record(record)

      time_ms = (time.to_f * 1000).floor

      scrub_record!(record)
      message = @formatter_proc.call(t, time, record)

      if message.empty?
        log.warn "Within specified message_key(s): (#{@message_keys.join(',')}) do not have non-empty record. Skip."
        next
      end

      if @max_message_length
        message = message.slice(0, @max_message_length)
      end

      events << {timestamp: time_ms, message: message}
    end
    # The log events in the batch must be in chronological ordered by their timestamp.
    # http://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_PutLogEvents.html
    events = events.sort_by {|e| e[:timestamp] }

    queue << [group_name, stream_name, events]
  }

  @concurrency.times do
    queue << nil
  end
  threads = @concurrency.times.map do |i|
    Thread.start do
      while job = queue.shift
        group_name, stream_name, events = job
        put_events_by_chunk(group_name, stream_name, events)
      end
    end
  end
  threads.each(&:join)
end