Class: BBFS::ContentServer::FileStreamer

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(send_chunk_clb, abort_streaming_clb = nil) ⇒ FileStreamer

Returns a new instance of FileStreamer.



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# File 'lib/content_server/file_streamer.rb', line 49

def initialize(send_chunk_clb, abort_streaming_clb=nil)
  @send_chunk_clb = send_chunk_clb
  @abort_streaming_clb = abort_streaming_clb
  @stream_queue = Queue.new

  # Used from internal thread only.
  @streams = {}
  @thread = run
end

Instance Attribute Details

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/content_server/file_streamer.rb', line 42

def thread
  @thread
end

Instance Method Details

#abort_streaming(checksum) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 67

def abort_streaming(checksum)
  @stream_queue << [:ABORT_STREAM, checksum]
end

#copy_another_chuck(checksum) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 59

def copy_another_chuck(checksum)
  @stream_queue << [:COPY_CHUNK, checksum]
end

#handle(message) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 83

def handle(message)
  type, content = message
  if type == :NEW_STREAM
    checksum, path = content
    reset_stream(checksum, path, 0)
    @stream_queue << [:COPY_CHUNK, checksum] if @streams.key?(checksum)
  elsif type == :ABORT_STREAM
    checksum = content
    Stream.close_delete_stream(checksum, @streams)
  elsif type == :RESET_STREAM
    checksum, new_offset = content
    reset_stream(checksum, nil, new_offset)
    @stream_queue << [:COPY_CHUNK, checksum] if @streams.key?(checksum)
  elsif type == :COPY_CHUNK
    checksum = content
    if @streams.key?(checksum)
      offset = @streams[checksum].file.pos
      Log.debug1("Sending chunk for #{checksum}, offset #{offset}.")
      chunk = @streams[checksum].file.read(Params['streaming_chunk_size'])
      if chunk.nil?
        # No more to read, send end of file.
        @send_chunk_clb.call(checksum, offset, @streams[checksum].size, nil, nil)
        Stream.close_delete_stream(checksum, @streams)
      else
        chunk_checksum = FileIndexing::IndexAgent.get_content_checksum(chunk)
        @send_chunk_clb.call(checksum, offset, @streams[checksum].size, chunk, chunk_checksum)
      end
    else
      Log.info("No checksum found to copy chunk. #{checksum}.")
    end
  end

end

#reset_stream(checksum, path, offset) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 117

def reset_stream(checksum, path, offset)
  if !@streams.key? checksum
    begin
      file = File.new(path, 'rb')
      if offset > 0
        file.seek(offset)
      end
      Log.info("File streamer: #{file.to_s}.")
    rescue IOError => e
      Log.warning("Could not stream local file #{path}. #{e.to_s}")
    end
    @streams[checksum] = Stream.new(checksum, path, file, file.size)
  else
    @streams[checksum].file.seek(offset)
  end
end

#reset_streaming(checksum, new_offset) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 71

def reset_streaming(checksum, new_offset)
  @stream_queue << [:RESET_STREAM, [checksum, new_offset]]
end

#run ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 75

def run
  return Thread.new do
    loop {
      checksum = handle(@stream_queue.pop)
    }
  end
end

#start_streaming(checksum, path) ⇒ Object 



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# File 'lib/content_server/file_streamer.rb', line 63

def start_streaming(checksum, path)
  @stream_queue << [:NEW_STREAM, [checksum, path]]
end