EOF on zeromq file transfer - zeromq

Question

I am using the below Python code to transfer large files between a server and a client using zeromq.
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):
filename.seek(offset)
chunksize = CHUNK_SIZE
if offset == offsets:
chunksize = filesize - (CHUNK_SIZE * (offset - 1)) # calculate the size of the last chunk
data = filename.read(chunksize)
pair.send(data)
pair.send(b'')
Implementation to receive file, client
while True:
data = pairs.recv()
if data is not '':
target.write(data)
else:
break
However, after transfer a large 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 properly?
Thanks

Answer 1

Just found the solution. The seek() was not processing the chunks properly.
-filename.seek(offset)
+filename.seek(0, 1)
Thus, it will always get the offset 0 on current (last) position.
Now everything is working as expected :)