python openstack SDK show file upload via progress bar

Question

With the python openstack SDK, you can download an image, chunk by chunk, which allowed me to show a progress bar.

You can't seem to do the same when uploading a file.

What I want is to be able to show a progress bar of the file being uploaded (in the same way I have for the file being downloaded).

Is there a way to attach a kind of "file read" call back to the file object? so every time it get's read I can show a progress bar?

I did look at the python file object docs but I couldn't really find anything definitive.

P.s.

For those that are interested, my code:

ESCAPE = {
 'c': { # colours
 'fg': { # foreground
 'b': '30', # black
 'r': '31', # red
 'g': '32', # green
 'y': '33', # yellow
 'u': '34', # blue
 'p': '35', # purple
 'c': '36', # cyan
 'w': '37', # white
 },
 'bg': { # background
 'b': '40', # black
 'r': '41', # red
 'g': '42', # green
 'y': '43', # yellow
 'u': '44', # blue
 'p': '45', # purple
 'c': '46', # cyan
 'w': '47', # white
 }
 },
 's': { # style
 'n': '0', # none
 'b': '1', # bold
 'u': '2', # underline
 'n1': '3', # negative1
 'n2': '5', # negative2
 },
 't': '033円[{s};{fg};{bg}m' # template 
}
def spinner(msg: str):
 template = f"{colour(fg='p', s='b')}{'{}'}{colour()} {msg}"
 while True:
 for spin in '⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏':
 yield template.format(spin)
def progress(end: int, max_col=78):
 template = f"[{colour(bg='g')}{'{}'}{colour(bg='r')}{'{}'}{colour()}|{'{}'}]"
 for p in range(1, end):
 bar = ' ' * int(max_col * p/(end-1))
 togo = ' ' * int(max_col - len(bar))
 perc = "%6.2f %%" % (p/(end-1)*100)
 yield template.format(bar, togo, perc)
def colour(fg='w', bg='b', s='n'):
 return ESCAPE['t'].format(
 s=ESCAPE['s'][s],
 fg=ESCAPE['c']['fg'][fg],
 bg=ESCAPE['c']['bg'][bg]
 )

Answer 1

So, after quite a bit of searching I was able to find a way to do what I was asking (here & here).

code:

#!/usr/bin/env python3
from types import MethodType
def hook(hookfunk, oldfunc):
 def merged(self, *args, **kwargs):
 hookfunk(self, *args, **kwargs)
 return oldfunc(*args, **kwargs)
 return MethodType(merged, oldfunc.__self__)
f = open('cirros.qcow2', 'rb')
def new_read(self, size):
 print(self)
 # Or do other code, like updating a progress bar
f.read = hook(new_read, f.read)
f.read()