Class: FileWatch::ReadMode::Handlers::ReadFile

Inherits:
Base
  • Object
show all
Defined in:
lib/filewatch/read_mode/handlers/read_file.rb

Instance Attribute Summary

Attributes inherited from Base

#sincedb_collection

Instance Method Summary collapse

Methods inherited from Base

#handle, #initialize, #quit?

Constructor Details

This class inherits a constructor from FileWatch::ReadMode::Handlers::Base

Instance Method Details

#controlled_read(watched_file, loop_control) ⇒ Object 



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# File 'lib/filewatch/read_mode/handlers/read_file.rb', line 45

def controlled_read(watched_file, loop_control)
  logger.trace? && logger.trace("reading...", :filename => watched_file.filename, :iterations => loop_control.count, :amount => loop_control.size)
  loop_control.count.times do
    break if quit?
    begin
      result = watched_file.read_extract_lines(loop_control.size) # expect BufferExtractResult
      logger.info(result.warning, result.additional) unless result.warning.empty?
      result.lines.each do |line|
        watched_file.listener.accept(line)
        # sincedb position is independent from the watched_file bytes_read
        delta = line.bytesize + @settings.delimiter_byte_size
        sincedb_collection.increment(watched_file.sincedb_key, delta)
      end
    rescue EOFError => e
      log_error("controlled_read: eof error reading file", watched_file, e)
      loop_control.flag_read_error
      break
    rescue Errno::EWOULDBLOCK, Errno::EINTR => e
      log_error("controlled_read: block or interrupt error reading file", watched_file, e)
      watched_file.listener.error
      loop_control.flag_read_error
      break
    rescue => e
      log_error("controlled_read: general error reading file", watched_file, e)
      watched_file.listener.error
      loop_control.flag_read_error
      break
    end
  end
end

#handle_specifically(watched_file) ⇒ Object 



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# File 'lib/filewatch/read_mode/handlers/read_file.rb', line 14

def handle_specifically(watched_file)
  if open_file(watched_file)
    add_or_update_sincedb_collection(watched_file) unless sincedb_collection.member?(watched_file.sincedb_key)
    seek_to_furthest_position(watched_file)
    loop do
      break if quit?
      loop_control = watched_file.loop_control_adjusted_for_stat_size
      controlled_read(watched_file, loop_control)
      sincedb_collection.request_disk_flush
      break unless loop_control.keep_looping?
    end
    if watched_file.all_read?
      # flush the buffer now in case there is no final delimiter
      line = watched_file.buffer.flush
      watched_file.listener.accept(line) unless line.empty?
      watched_file.listener.eof
      watched_file.file_close
      key = watched_file.sincedb_key
      if sincedb_collection.get(key)
        sincedb_collection.reading_completed(key)
        sincedb_collection.clear_watched_file(key)
      end
      watched_file.listener.deleted
      # NOTE: on top of un-watching we should also remove from the watched files collection
      # if the file is getting deleted (on completion), that part currently resides in
      # DeleteCompletedFileHandler - triggered above using `watched_file.listener.deleted`
      watched_file.unwatch
    end
  end
end

#log_error(msg, watched_file, error) ⇒ Object 



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# File 'lib/filewatch/read_mode/handlers/read_file.rb', line 76

def log_error(msg, watched_file, error)
  details = { :path => watched_file.path,
              :exception => error.class,
              :message => error.message,
              :backtrace => error.backtrace }
  if logger.debug?
    details[:file] = watched_file
  else
    details[:backtrace] = details[:backtrace].take(8) if details[:backtrace]
  end
  logger.error(msg, details)
end