Class: S3reamer::DirectoryStreamer

Inherits:
Object
  • Object
show all
Defined in:
lib/s3reamer/directory_streamer.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  pool_size: 4,
  log_level: Logger::INFO,
  reader_sleep_interval: 1,
  reader_timeout: 10,
  encryption_key: nil,
  log_file: STDOUT,
  filters: []
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ DirectoryStreamer

Returns a new instance of DirectoryStreamer.



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# File 'lib/s3reamer/directory_streamer.rb', line 25

def initialize(options = {})
  @options = DEFAULT_OPTIONS.merge(options)
  @log = Logger.new(options[:log_file])
  @log.level = options[:log_level]
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/s3reamer/directory_streamer.rb', line 23

def options
  @options
end

Instance Method Details

#stream_directory(directory:, bucket:) ⇒ Object 



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# File 'lib/s3reamer/directory_streamer.rb', line 31

def stream_directory(directory:, bucket:)
  file_statuses = ThreadSafe::Hash.new
  dir_watch = INotify::Notifier.new
  pool = Thread.pool(options[:pool_size])

  log.info "Setting up watch on: #{directory}"

  dir_watch.watch(directory, :open, :close, :recursive) do |e|
    filename = e.absolute_name

    log.debug "Events #{e.flags.inspect} received for: #{filename}"

    # Don't process directories
    next unless File.exists?(filename) and !File.directory?(filename)

    # If this is an "open" event, we should only process it if we haven't
    # already started on this file.
    next if e.flags.include?(:open) and file_statuses.include?(filename)
    
    if options[:filters].any? && options[:filters].none? { |x| File.fnmatch(x, filename) }
      log.debug "Skipping event for file not matching filters: #{filename}"
      next
    end

    # If this is a "close" event, we should update the status to inform the
    # worker thread
    if e.flags.include?(:close) and file_statuses.include?(filename)
      file_statuses[filename] = :close
      next
    end

    log.info "File opened: #{filename}"
    file_statuses[filename] = :open

    pool.process {
      log.debug "Starting process for: #{filename}"

      begin
        prefix = Pathname.new(filename)
        prefix = prefix.relative_path_from(Pathname.new(directory))
        prefix = "#{options[:prefix]}#{prefix}"

        obj = bucket.object(prefix)
        io = S3reamer::S3WriteStream.new(obj)
      rescue Exception => e
        log.error "Error initializing S3 streamer: #{e}\n#{e.backtrace.join("\n")}"
        raise e
      end

      log.debug "Initialized S3 streamer"

      open(filename) do |file|
        stopped = false
        size = 0
        last_successful_read = Time.now

        # Start with bytes_read != 0 to force at least one read of the file.
        # This addresses the race condition caused by files being opened and
        # closed quickly.
        bytes_read = -1

        # Go until the file has closed, or until we've not seen any new
        # bytes written to the file past some threshold (specified by
        # options[:reader_timeout]).
        while (file_statuses[filename] == :open || bytes_read != 0) &&
          (last_successful_read + options[:reader_timeout]) > Time.now

          b = file.read
          bytes_read = b.length
          io.write(b)

          # If we read any bytes, reset the time at which we last saw new
          # bytes in the file. This prevents the read timeout condition from
          # triggering.
          if bytes_read > 0
            log.debug "Read #{bytes_read} bytes: #{filename}"
            last_successful_read = Time.now
          end

          sleep options[:reader_sleep_interval] unless file_statuses[filename] != :open
        end

        log.info "File closed. Completing S3 upload: #{filename}"
      end

      begin
        io.close
      rescue Exception => e
        log.error "Error completing S3 upload: #{e}:\n#{e.backtrace.join("\n")}"
      end

      file_statuses.delete(filename)
    }
  end

  dir_watch.run
  pool.shutdown
end