Class: OpenC3::LogWriter

Inherits:
Object show all
Defined in:
lib/openc3/logs/log_writer.rb

Overview

Creates a log. Can automatically cycle the log based on an elasped time period or when the log file reaches a predefined size.

Direct Known Subclasses

PacketLogWriter, TextLogWriter

Constant Summary collapse

CYCLE_TIME_INTERVAL =

The cycle time interval. Cycle times are only checked at this level of granularity.

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CLEANUP_DELAY =

Delay in seconds before trimming Redis streams

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@@mutex =

Mutex protecting class variables

Mutex.new
@@instances =

Array of instances used to keep track of cycling logs

[]
@@cycle_thread =

Thread used to cycle logs across all log writers

nil
@@cycle_sleeper =

Sleeper used to delay cycle thread

nil

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(remote_log_directory, logging_enabled = true, cycle_time = nil, cycle_size = 1000000000, cycle_hour = nil, cycle_minute = nil, enforce_time_order = true) ⇒ LogWriter

Returns a new instance of LogWriter.

Parameters:

  • remote_log_directory (String) —

    The path to store the log files

  • logging_enabled (Boolean) (defaults to: true) —

    Whether to start with logging enabled

  • cycle_time (Integer) (defaults to: nil) —

    The amount of time in seconds before creating a new log file. This can be combined with cycle_size but is better used independently.

  • cycle_size (Integer) (defaults to: 1000000000) —

    The size in bytes before creating a new log file. This can be combined with cycle_time but is better used independently.

  • cycle_hour (Integer) (defaults to: nil) —

    The time at which to cycle the log. Combined with cycle_minute to cycle the log daily at the specified time. If nil, the log will be cycled hourly at the specified cycle_minute.

  • cycle_minute (Integer) (defaults to: nil) —

    The time at which to cycle the log. See cycle_hour for more information.



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# File 'lib/openc3/logs/log_writer.rb', line 96

def initialize(
  remote_log_directory,
  logging_enabled = true,
  cycle_time = nil,
  cycle_size = 1000000000,
  cycle_hour = nil,
  cycle_minute = nil,
  enforce_time_order = true
)
  @remote_log_directory = remote_log_directory
  @logging_enabled = ConfigParser.handle_true_false(logging_enabled)
  @cycle_time = ConfigParser.handle_nil(cycle_time)
  if @cycle_time
    @cycle_time = Integer(@cycle_time)
    raise "cycle_time must be >= #{CYCLE_TIME_INTERVAL}" if @cycle_time < CYCLE_TIME_INTERVAL
  end
  @cycle_size = ConfigParser.handle_nil(cycle_size)
  @cycle_size = Integer(@cycle_size) if @cycle_size
  @cycle_hour = ConfigParser.handle_nil(cycle_hour)
  @cycle_hour = Integer(@cycle_hour) if @cycle_hour
  @cycle_minute = ConfigParser.handle_nil(cycle_minute)
  @cycle_minute = Integer(@cycle_minute) if @cycle_minute
  @enforce_time_order = ConfigParser.handle_true_false(enforce_time_order)
  @out_of_order = false
  @mutex = Mutex.new
  @file = nil
  @file_size = 0
  @filename = nil
  @start_time = Time.now.utc
  @first_time = nil
  @last_time = nil
  @cancel_threads = false
  @last_offsets = {}
  @cleanup_offsets = []
  @cleanup_times = []
  @previous_time_nsec_since_epoch = nil

  # This is an optimization to avoid creating a new entry object
  # each time we create an entry which we do a LOT!
  @entry = String.new

  # Always make sure there is a cycle thread - (because it does trimming)
  @@mutex.synchronize do
    @@instances << self

    unless @@cycle_thread
      @@cycle_thread = OpenC3.safe_thread("Log cycle") do
        cycle_thread_body()
      end
    end
  end
end

Instance Attribute Details

#cleanup_offsets ⇒ Object

Redis offsets for each topic to cleanup



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# File 'lib/openc3/logs/log_writer.rb', line 59

def cleanup_offsets
  @cleanup_offsets
end

#cleanup_times ⇒ Object

Time at which to cleanup



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# File 'lib/openc3/logs/log_writer.rb', line 62

def cleanup_times
  @cleanup_times
end

#cycle_hour ⇒ Object (readonly)

Returns the value of attribute cycle_hour.



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# File 'lib/openc3/logs/log_writer.rb', line 46

def cycle_hour
  @cycle_hour
end

#cycle_minute ⇒ Object (readonly)

Returns the value of attribute cycle_minute.



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# File 'lib/openc3/logs/log_writer.rb', line 50

def cycle_minute
  @cycle_minute
end

#cycle_time ⇒ Object (readonly)

Returns the value of attribute cycle_time.



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# File 'lib/openc3/logs/log_writer.rb', line 41

def cycle_time
  @cycle_time
end

#filename ⇒ String (readonly)

Returns The filename of the packet log.

Returns:

  • (String) —

    The filename of the packet log



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# File 'lib/openc3/logs/log_writer.rb', line 33

def filename
  @filename
end

#logging_enabled ⇒ true/false (readonly)

Returns Whether logging is enabled.

Returns:

  • (true/false) —

    Whether logging is enabled



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# File 'lib/openc3/logs/log_writer.rb', line 36

def logging_enabled
  @logging_enabled
end

#mutex ⇒ Mutex (readonly)

Returns Instance mutex protecting file.

Returns:

  • (Mutex) —

    Instance mutex protecting file



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# File 'lib/openc3/logs/log_writer.rb', line 56

def mutex
  @mutex
end

#start_time ⇒ Time (readonly)

Returns Time that the current log file started.

Returns:

  • (Time) —

    Time that the current log file started



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# File 'lib/openc3/logs/log_writer.rb', line 53

def start_time
  @start_time
end

Instance Method Details

#bucket_filename ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 339

def bucket_filename
  "#{first_timestamp}__#{last_timestamp}" + extension
end

#close_file(take_mutex = true) ⇒ Object

Closing a log file isn’t critical so we just log an error. NOTE: This also trims the Redis stream to keep a full file’s worth of data in the stream. This is what prevents continuous stream growth. Returns thread that moves log to bucket



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# File 'lib/openc3/logs/log_writer.rb', line 307

def close_file(take_mutex = true)
  threads = []
  @mutex.lock if take_mutex
  begin
    if @file
      begin
        @file.close unless @file.closed?
        Logger.debug "Log File Closed : #{@filename}"
        date = first_timestamp[0..7] # YYYYMMDD
        bucket_key = File.join(@remote_log_directory, date, bucket_filename())
        threads << BucketUtilities.move_log_file_to_bucket(@filename, bucket_key)
        # Now that the file is in storage, trim the Redis stream after a delay
        @cleanup_offsets << {}
        @last_offsets.each do |redis_topic, last_offset|
          @cleanup_offsets[-1][redis_topic] = last_offset
        end
        @cleanup_times << Time.now + CLEANUP_DELAY
        @last_offsets.clear
      rescue Exception => err
        Logger.instance.error "Error closing #{@filename} : #{err.formatted}"
      end

      @file = nil
      @file_size = 0
      @filename = nil
    end
  ensure
    @mutex.unlock if take_mutex
  end
  return threads
end

#create_unique_filename(ext = extension) ⇒ Object

implementation details



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# File 'lib/openc3/logs/log_writer.rb', line 183

def create_unique_filename(ext = extension)
  # Create a filename that doesn't exist
  attempt = nil
  while true
    filename_parts = [attempt]
    filename_parts.unshift @label if @label
    filename = File.join(Dir.tmpdir, File.build_timestamped_filename([@label, attempt], ext))
    if File.exist?(filename)
      attempt ||= 0
      attempt += 1
    else
      return filename
    end
  end
end

#cycle_thread_body ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 199

def cycle_thread_body
  @@cycle_sleeper = Sleeper.new
  while true
    start_time = Time.now
    @@mutex.synchronize do
      @@instances.each do |instance|
        # The check against start_time needs to be mutex protected to prevent a packet coming in between the check
        # and closing the file
        instance.mutex.synchronize do
          utc_now = Time.now.utc
          # Logger.debug("start:#{@start_time.to_f} now:#{utc_now.to_f} cycle:#{@cycle_time} new:#{(utc_now - @start_time) > @cycle_time}")
          if instance.logging_enabled and instance.filename # Logging and file opened
            # Cycle based on total time logging
            if (instance.cycle_time and (utc_now - instance.start_time) > instance.cycle_time)
              Logger.debug("Log writer start new file due to cycle time")
              instance.close_file(false)
            # Cycle daily at a specific time
            elsif (instance.cycle_hour and instance.cycle_minute and utc_now.hour == instance.cycle_hour and utc_now.min == instance.cycle_minute and instance.start_time.yday != utc_now.yday)
              Logger.debug("Log writer start new file daily")
              instance.close_file(false)
            # Cycle hourly at a specific time
            elsif (instance.cycle_minute and not instance.cycle_hour and utc_now.min == instance.cycle_minute and instance.start_time.hour != utc_now.hour)
              Logger.debug("Log writer start new file hourly")
              instance.close_file(false)
            end
          end

          # Check for cleanup time
          indexes_to_clear = []
          instance.cleanup_times.each_with_index do |cleanup_time, index|
            if cleanup_time <= utc_now
              # Now that the file is in S3, trim the Redis stream up until the previous file.
              # This keeps one minute of data in Redis
              instance.cleanup_offsets[index].each do |redis_topic, cleanup_offset|
                Topic.trim_topic(redis_topic, cleanup_offset)
              end
              indexes_to_clear << index
            end
          end
          if indexes_to_clear.length > 0
            indexes_to_clear.each do |index|
              instance.cleanup_offsets[index] = nil
              instance.cleanup_times[index] = nil
            end
            instance.cleanup_offsets.compact!
            instance.cleanup_times.compact!
          end
        end
      end
    end

    # Only check whether to cycle at a set interval
    run_time = Time.now - start_time
    sleep_time = CYCLE_TIME_INTERVAL - run_time
    sleep_time = 0 if sleep_time < 0
    break if @@cycle_sleeper.sleep(sleep_time)
  end
end

#extension ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 343

def extension
  '.log'.freeze
end

#first_time ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 347

def first_time
  Time.from_nsec_from_epoch(@first_time)
end

#first_timestamp ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 355

def first_timestamp
  first_time().to_timestamp # "YYYYMMDDHHmmSSNNNNNNNNN"
end

#graceful_kill ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 177

def graceful_kill
  @cancel_threads = true
end

#last_time ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 351

def last_time
  Time.from_nsec_from_epoch(@last_time)
end

#last_timestamp ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 359

def last_timestamp
  last_time().to_timestamp # "YYYYMMDDHHmmSSNNNNNNNNN"
end

#prepare_write(time_nsec_since_epoch, data_length, redis_topic, redis_offset) ⇒ Object 



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# File 'lib/openc3/logs/log_writer.rb', line 281

def prepare_write(time_nsec_since_epoch, data_length, redis_topic, redis_offset)
  # This check includes logging_enabled again because it might have changed since we acquired the mutex
  # Ensures new files based on size, and ensures always increasing time order in files
  if @logging_enabled
    if !@file
      Logger.debug("Log writer start new file because no file opened")
      start_new_file()
    elsif @cycle_size and ((@file_size + data_length) > @cycle_size)
      Logger.debug("Log writer start new file due to cycle size #{@cycle_size}")
      start_new_file()
    elsif @enforce_time_order and @previous_time_nsec_since_epoch and (@previous_time_nsec_since_epoch > time_nsec_since_epoch)
      # Warning: Creating new files here can cause lots of files to be created if packets make it through out of order
      # Changed to just a error to prevent file thrashing
      unless @out_of_order
        Logger.error("Log writer out of order time detected (increase buffer depth?): #{Time.from_nsec_from_epoch(@previous_time_nsec_since_epoch)} #{Time.from_nsec_from_epoch(time_nsec_since_epoch)}")
        @out_of_order = true
      end
    end
  end
  @last_offsets[redis_topic] = redis_offset if redis_topic and redis_offset # This is needed for the redis offset marker entry at the end of the log file
  @previous_time_nsec_since_epoch = time_nsec_since_epoch
end

#shutdown ⇒ Object

Stop all logging, close the current log file, and kill the logging threads.



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# File 'lib/openc3/logs/log_writer.rb', line 164

def shutdown
  threads = stop()
  @@mutex.synchronize do
    @@instances.delete(self)
    if @@instances.length <= 0
      @@cycle_sleeper.cancel if @@cycle_sleeper
      OpenC3.kill_thread(self, @@cycle_thread) if @@cycle_thread
      @@cycle_thread = nil
    end
  end
  return threads
end

#start ⇒ Object

Starts a new log file by closing the existing log file. New log files are not created until packets are written by #write so this does not immediately create a log file on the filesystem.



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# File 'lib/openc3/logs/log_writer.rb', line 152

def start
  @mutex.synchronize { close_file(false); @logging_enabled = true }
end

#start_new_file ⇒ Object

Starting a new log file is a critical operation so the entire method is wrapped with a rescue and handled with handle_critical_exception Assumes mutex has already been taken



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# File 'lib/openc3/logs/log_writer.rb', line 261

def start_new_file
  close_file(false)

  # Start log file
  @filename = create_unique_filename()
  @file = File.new(@filename, 'wb')
  @file_size = 0

  @start_time = Time.now.utc
  @out_of_order = false
  @first_time = nil
  @last_time = nil
  @previous_time_nsec_since_epoch = nil
  Logger.debug "Log File Opened : #{@filename}"
rescue => err
  Logger.error "Error starting new log file: #{err.formatted}"
  @logging_enabled = false
  OpenC3.handle_critical_exception(err)
end

#stop ⇒ Object

Stops all logging and closes the current log file.



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# File 'lib/openc3/logs/log_writer.rb', line 157

def stop
  threads = nil
  @mutex.synchronize { @logging_enabled = false; threads = close_file(false) }
  return threads
end