sendfile_server

import socket, struct, sys
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(("127.0.0.1", int(sys.argv[1])))
server.listen(1)
while True:
    client, _ = server.accept()
    name_len = struct.unpack('>I', client.recv(4))[0]
    name = client.recv(name_len).decode()
    file_len = struct.unpack('>I', client.recv(4))[0]
    with open(name, 'wb') as file:
        for chunk in iter(lambda: client.recv(4096), b''):
            file.write(chunk)
        if file_len != file.tell():
            raise Exception("Unexpected file size")