[zeromq-dev] EOF on file transfer

Tiago Hillebrandt tiagohillebrandt at ubuntu.com
Tue Dec 9 17:46:43 CET 2014

Hey guys,

I am using the below Python code to transfer big files between a server and
a client.

*Implementation to send file, server*

    CHUNK_SIZE = 250000

    message = pair.recv() # message is the path to the file

    filename = open(message, 'rb')
    filesize = os.path.getsize(message)

    offsets = (int(ceil(filesize / CHUNK_SIZE)), 0)[filesize <= CHUNK_SIZE]

    for offset in range(offsets + 1):

        chunksize = CHUNK_SIZE

        if offset == offsets:
            chunksize = filesize - (CHUNK_SIZE * (offset - 1)) #
calculate the size of the last chunk

        data = filename.read(chunksize)



*Implementation to receive file, client*

while True:
    data = pairs.recv()

    if data is not '':

However, after transfer a big file using this implementation, for some
reason an extra data is being added at end of the file:

*File server side*

$ stat file.zip
  File: `file.zip'
  Size: 1503656416  Blocks: 2936840    IO Block: 4096   regular file

*Client side*

$ stat file.zip
  File: `file.zip'
  Size: 1503906416  Blocks: 2937328    IO Block: 4096   regular file

The size and blocks are different between them.

That said, do you have any suggestions to calculate/send the end of file

*Tiago Hillebrandt*
Ubuntu Member
Ubuntu Brazilian Community Council Member
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