def get_progress():
    """Returns a tuple of floats, (chk, ciphertext, encode_and_push),
        each from 0.0 to 1.0 . 'chk' describes how much progress has been
        made towards hashing the file to determine a CHK encryption key: if
        non-convergent encryption is in use, this will be trivial, otherwise
        the whole file must be hashed. 'ciphertext' describes how much of the
        ciphertext has been pushed to the helper, and is '1.0' for non-helper
        uploads. 'encode_and_push' describes how much of the encode-and-push
        process has finished: for helper uploads this is dependent upon the
        helper providing progress reports. It might be reasonable to add all
        three numbers and report the sum to the user."""
