Class: ContentServer::FileReceiver

Inherits:
Object
  • Object
show all
Defined in:
lib/content_server/file_streamer.rb

Overview

Start implementing as dummy, no self thread for now. Later when we need it to response and send aborts, timeouts, ect, it will need self thread.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_done_clb = nil, file_abort_clb = nil, reset_copy = nil) ⇒ FileReceiver

Returns a new instance of FileReceiver.



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# File 'lib/content_server/file_streamer.rb', line 149

def initialize(file_done_clb=nil, file_abort_clb=nil, reset_copy=nil)
  @file_done_clb = file_done_clb
  @file_abort_clb = file_abort_clb
  @reset_copy = reset_copy
  @streams = {}
end

Class Method Details

.destination_filename(folder, sha1) ⇒ Object

Creates destination filename for backup server, input is base folder and sha1. for example: folder:/mnt/hd1/bbbackup, sha1:d0be2dc421be4fcd0172e5afceea3970e2f3d940 dest filename: /mnt/hd1/bbbackup/d0/be/2d/d0be2dc421be4fcd0172e5afceea3970e2f3d940



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# File 'lib/content_server/file_streamer.rb', line 298

def self.destination_filename(folder, sha1)
  File.join(folder, sha1[0,2], sha1[2,2], sha1)
end

.write_string_to_file(str, file) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 287

def self.write_string_to_file(str, file)
  bytes_to_write = str.bytesize
  Log.debug1("writing to file: %s, %s bytes.", file, bytes_to_write)
  while bytes_to_write > 0
    bytes_to_write -= file.write(str)
  end
end

Instance Method Details

#receive_chunk(file_checksum, offset, file_size, content, content_checksum) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 156

def receive_chunk(file_checksum, offset, file_size, content, content_checksum)
  # If standard chunk copy.
  if !content.nil? && !content_checksum.nil?
    received_content_checksum = FileIndexing::IndexAgent.get_content_checksum(content)
    comment = "Calculated received chunk with content checksum #{received_content_checksum}" \
                " vs message content checksum #{content_checksum}, " \
                "file checksum #{file_checksum}"
    Log.debug1(comment) if content_checksum == received_content_checksum
    # TODO should be here a kind of abort?
    if content_checksum != received_content_checksum
      Log.warning(comment)
      new_offset = 0
      if @streams.key?(file_checksum)
        new_offset = @streams[file_checksum].file.pos
      end
      @reset_copy.call(file_checksum, new_offset) unless @reset_copy.nil?
      return false
    end

    if !@streams.key?(file_checksum)
      handle_new_stream(file_checksum, file_size)
    end
    # We still check @streams has the key, because file can fail to open.
    if @streams.key?(file_checksum)
      return handle_new_chunk(file_checksum, offset, content)
    else
      Log.warning('Cannot handle chunk, stream does not exists, sending abort.')
      @file_abort_clb.call(file_checksum) unless @file_abort_clb.nil?
      return false
    end
    # If last chunk copy.
  elsif content.nil? && content_checksum.nil?
    Log.debug1('Handle the case of backup empty file or last chunk')
    # Handle the case of backup empty file or last chunk.
    handle_new_stream(file_checksum, 0) if !@streams.key?(file_checksum)
    # Finalize the file copy.
    handle_last_chunk(file_checksum)
    return true
  else
    Log.warning("Unexpected receive chuck message. file_checksum:#{file_checksum}, " \
                  "content.nil?:#{content.nil?}, content_checksum:#{content_checksum}")
    return false
  end
  Log.error('Code should never reach this point')
end