Class: Fluent::Plugin::CloudwatchLogsOutput

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

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 53

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 59

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
end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 109

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

#formatted_to_msgpack_binary? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 114

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 118

def multi_workers_ready?
  true
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_cloudwatch_logs.rb', line 80

def start
  super

  options = {}
  options[:region] = @region if @region
  options[:endpoint] = @endpoint if @endpoint

  if @aws_use_sts
    Aws.config[:region] = options[:region]
    options[:credentials] = Aws::AssumeRoleCredentials.new(
      role_arn: @aws_sts_role_arn,
      role_session_name: @aws_sts_session_name
    )
  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

  @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 122

def write(chunk)
  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 = @log_group_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|
      time_ms = time * 1000

      scrub_record!(record)
      if @message_keys
        message = @message_keys.split(',').map {|k| record[k].to_s }.join(' ')
      else
        message = @json_handler.dump(record)
      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