/
full_demo.py
executable file
·172 lines (149 loc) · 6.48 KB
/
full_demo.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#!/usr/bin/env python
from __future__ import print_function
import logging
import time
import bitmath
from bitmath.integrations.bmargparse import BitmathType
from bitmath.integrations.bmprogressbar import BitmathFileTransferSpeed
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=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(), ' ',
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))