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#!/usr/bin/env python
from __future__ import print_function
import logging
import time
import bitmath
import bitmath.integrations
import argparse
import requests
import progressbar
import os
import tempfile
import atexit
import random
from functools import reduce
# Files of various sizes to use in the demo.
#
# Moar here: https://www.kernel.org/pub/linux/kernel/v3.0/?C=S;O=D
REMOTES = [
# patch-3.0.70.gz 20-Mar-2013 20:02 1.0M
'https://www.kernel.org/pub/linux/kernel/v3.0/patch-3.4.92.xz',
# patch-3.16.gz 03-Aug-2014 22:39 8.0M
'https://www.kernel.org/pub/linux/kernel/v3.0/patch-3.16.gz',
# patch-3.2.gz 05-Jan-2012 00:43 22M
'https://www.kernel.org/pub/linux/kernel/v3.0/patch-3.2.gz',
]
######################################################################
p = argparse.ArgumentParser(description='bitmath demo suite')
p.add_argument('-d', '--down', help="Download Rate",
type=bitmath.integrations.BitmathType,
default=bitmath.MiB(4))
p.add_argument('-s', '--slowdown',
help='Randomly pause to slow down the transfer rate',
action='store_true', default=False)
args = p.parse_args()
######################################################################
# Save our example files somewhere. And then clean up every trace that
# anything every happened there. shhhhhhhhhhhhhhhh
DESTDIR = tempfile.mkdtemp('demosuite', 'bitmath')
@atexit.register
def cleanup():
for f in os.listdir(DESTDIR):
os.remove(os.path.join(DESTDIR, f))
os.rmdir(DESTDIR)
######################################################################
for f in REMOTES:
print("""
######################################################################""")
fname = os.path.basename(f)
# An array of widgets to design our progress bar. Note how we use
# BitmathFileTransferSpeed
widgets = ['Bitmath Demo Suite (%s): ' % fname,
progressbar.Percentage(), ' ',
progressbar.Bar(marker=progressbar.RotatingMarker()), ' ',
progressbar.ETA(), ' ',
bitmath.integrations.BitmathFileTransferSpeed()]
# The 'stream' keyword lets us http GET files in
# chunks. http://docs.python-requests.org/en/latest/user/quickstart/#raw-response-content
r = requests.get(f, stream=True)
# We haven't began receiving the payload content yet, we have only
# just received the response headers. Of interest is the
# 'content-length' header which describes our payload in bytes
#
# http://bitmath.readthedocs.org/en/latest/classes.html#bitmath.Byte
size = bitmath.Byte(int(r.headers['Content-Length']))
# Demonstrate 'with' context handler, allowing us to customize all
# bitmath string printing within the indented block. We don't need
# all that precision anyway, just two points should do.
#
# http://bitmath.readthedocs.org/en/latest/module.html#bitmath-format
with bitmath.format("{value:.2f} {unit}"):
print("Downloading %s (%s) in %s chunks" % (f,
size.best_prefix(),
args.down.best_prefix()))
# We have to save these files somewhere
save_path = os.path.join(DESTDIR, fname)
print("Saving to: %s" % save_path)
print("")
# OK. Let's create our actual progress bar now. See the 'maxval'
# keyword? That's the size of our payload in bytes.
pbar = progressbar.ProgressBar(
widgets=widgets,
maxval=int(size)).start()
######################################################################
# Open a new file for binary writing and write 'args.down' size
# chunks into it until we've received the entire payload
with open(save_path, 'wb') as fd:
# The 'iter_content' method accepts integer values of
# bytes. Lucky for us, 'args.down' is a bitmath instance and
# has a 'bytes' attribute we can feed into the method call.
for chunk in r.iter_content(int(args.down.bytes)):
fd.write(chunk)
# The progressbar will end the entire cosmos as we know it
# if we try to .update() it beyond it's MAXVAL
# parameter.
#
# That's something I'd like to avoid taking the
# responsibility for.
if (pbar.currval + args.down.bytes) < pbar.maxval:
pbar.update(pbar.currval + int(args.down.bytes))
# We can add an pause to artificially speed up/slowdown
# the transfer rate. Allows us to see different units.
if args.slowdown:
# randomly slow down 1/5 of the time
if random.randrange(0, 100) % 5 == 0:
time.sleep(random.randrange(0, 500) * 0.01)
# Nothing to see here. Go home.
pbar.finish()
######################################################################
print("""
######################################################################
List downloaded contents
* Filter for .xz files only
""")
for p,bm in bitmath.listdir(DESTDIR,
filter='*.xz'):
print(p, bm)
######################################################################
print("""
######################################################################
List downloaded contents
* Filter for .gz files only
* Print using best human readable prefix
""")
for p,bm in bitmath.listdir(DESTDIR,
filter='*.gz',
bestprefix=True):
print(p, bm)
######################################################################
print("""
######################################################################
List downloaded contents
* No filter set, to display all files
* Limit precision of printed file size to 3 digits
* Print using best human readable prefix
""")
for p,bm in bitmath.listdir(DESTDIR,
bestprefix=True):
with bitmath.format("{value:.3f} {unit}"):
print(p, bm)
######################################################################
print("""
######################################################################
Sum the size of all downloaded files together
* Print with best prefix and 3 digits of precision
""")
discovered_files = [f[1] for f in bitmath.listdir(DESTDIR)]
total_size = reduce(lambda x,y: x+y, discovered_files).best_prefix().format("{value:.3f} {unit}")
print("Total size of %s downloaded items: %s" % (len(discovered_files), total_size))
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