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virt-manager/virtinst/progress.py
Cole Robinson c603ea4084 util: Move *_meter to progress.py
2019-06-07 17:32:51 -04:00

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Python
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# This work is licensed under the GNU GPLv2 or later.
# See the COPYING file in the top-level directory.
# This file is part of urlgrabber, a high-level cross-protocol url-grabber
# Copyright 2002-2004 Michael D. Stenner, Ryan Tomayko
# This code is all straight from python-urlgrabber, which we historically
# used the system installed version of. But since the project is in
# maintenance mode upstream, and eventually we want to switch to python3,
# we are just copying this for now.
import sys
import time
import math
import fcntl
import struct
import termios
# Code from https://mail.python.org/pipermail/python-list/2000-May/033365.html
def terminal_width(fd=1):
""" Get the real terminal width """
try:
buf = 'abcdefgh'
buf = fcntl.ioctl(fd, termios.TIOCGWINSZ, buf)
ret = struct.unpack('hhhh', buf)[1]
if ret == 0:
return 80
# Add minimum too?
return ret
except IOError:
return 80
_term_width_val = None
_term_width_last = None
def terminal_width_cached(fd=1, cache_timeout=1.000):
""" Get the real terminal width, but cache it for a bit. """
global _term_width_val
global _term_width_last
now = time.time()
if _term_width_val is None or (now - _term_width_last) > cache_timeout:
_term_width_val = terminal_width(fd)
_term_width_last = now
return _term_width_val
class TerminalLine:
""" Help create dynamic progress bars, uses terminal_width_cached(). """
def __init__(self, min_rest=0, beg_len=None, fd=1, cache_timeout=1.000):
if beg_len is None:
beg_len = min_rest
self._min_len = min_rest
self.llen = terminal_width_cached(fd, cache_timeout)
if self.llen < beg_len:
self.llen = beg_len
self._fin = False
def __len__(self):
""" Usable length for elements. """
return self.llen - self._min_len
def rest_split(self, fixed, elements=2):
""" After a fixed length, split the rest of the line length among
a number of different elements (default=2). """
if self.llen < fixed:
return 0
return (self.llen - fixed) // elements
def add(self, element, full_len=None):
""" If there is room left in the line, above min_len, add element.
Note that as soon as one add fails all the rest will fail too. """
if full_len is None:
full_len = len(element)
if len(self) < full_len:
self._fin = True
if self._fin:
return ''
self.llen -= len(element)
return element
def rest(self):
""" Current rest of line, same as .rest_split(fixed=0, elements=1). """
return self.llen
class BaseMeter:
def __init__(self):
self.update_period = 0.3 # seconds
self.filename = None
self.url = None
self.basename = None
self.text = None
self.size = None
self.start_time = None
self.fsize = None
self.last_amount_read = 0
self.last_update_time = None
self.re = RateEstimator()
def start(self, filename=None, url=None, basename=None,
size=None, now=None, text=None):
self.filename = filename
self.url = url
self.basename = basename
self.text = text
self.size = size
if size is not None:
self.fsize = format_number(size) + 'B'
if now is None:
now = time.time()
self.start_time = now
self.re.start(size, now)
self.last_amount_read = 0
self.last_update_time = now
self._do_start(now)
def _do_start(self, now=None):
pass
def update(self, amount_read, now=None):
# for a real gui, you probably want to override and put a call
# to your mainloop iteration function here
if now is None:
now = time.time()
if (not self.last_update_time or
(now >= self.last_update_time + self.update_period)):
self.re.update(amount_read, now)
self.last_amount_read = amount_read
self.last_update_time = now
self._do_update(amount_read, now)
def _do_update(self, amount_read, now=None):
pass
def end(self, amount_read, now=None):
if now is None:
now = time.time()
self.re.update(amount_read, now)
self.last_amount_read = amount_read
self.last_update_time = now
self._do_end(amount_read, now)
def _do_end(self, amount_read, now=None):
pass
# This is kind of a hack, but progress is gotten from grabber which doesn't
# know about the total size to download. So we do this so we can get the data
# out of band here. This will be "fixed" one way or anther soon.
_text_meter_total_size = 0
_text_meter_sofar_size = 0
def text_meter_total_size(size, downloaded=0):
global _text_meter_total_size
global _text_meter_sofar_size
_text_meter_total_size = size
_text_meter_sofar_size = downloaded
#
# update: No size (minimal: 17 chars)
# -----------------------------------
# <text> <rate> | <current size> <elapsed time>
# 8-48 1 8 3 6 1 9 5
#
# Order: 1. <text>+<current size> (17)
# 2. +<elapsed time> (10, total: 27)
# 3. + ( 5, total: 32)
# 4. +<rate> ( 9, total: 41)
#
# update: Size, Single file
# -------------------------
# <text> <pc> <bar> <rate> | <current size> <eta time> ETA
# 8-25 1 3-4 1 6-16 1 8 3 6 1 9 1 3 1
#
# Order: 1. <text>+<current size> (17)
# 2. +<eta time> (10, total: 27)
# 3. +ETA ( 5, total: 32)
# 4. +<pc> ( 4, total: 36)
# 5. +<rate> ( 9, total: 45)
# 6. +<bar> ( 7, total: 52)
#
# update: Size, All files
# -----------------------
# <text> <total pc> <pc> <bar> <rate> | <current size> <eta time> ETA
# 8-22 1 5-7 1 3-4 1 6-12 1 8 3 6 1 9 1 3 1
#
# Order: 1. <text>+<current size> (17)
# 2. +<eta time> (10, total: 27)
# 3. +ETA ( 5, total: 32)
# 4. +<total pc> ( 5, total: 37)
# 4. +<pc> ( 4, total: 41)
# 5. +<rate> ( 9, total: 50)
# 6. +<bar> ( 7, total: 57)
#
# end
# ---
# <text> | <current size> <elapsed time>
# 8-56 3 6 1 9 5
#
# Order: 1. <text> ( 8)
# 2. +<current size> ( 9, total: 17)
# 3. +<elapsed time> (10, total: 27)
# 4. + ( 5, total: 32)
#
def _term_add_bar(tl, bar_max_length, pc):
bar_len = bar_max_length * pc
ibar_len = int(bar_len)
progressbar = '=' * ibar_len
if (bar_len - ibar_len) >= 0.5:
progressbar += '-'
return tl.add(' [%-*.*s]' % (bar_max_length, bar_max_length,
progressbar))
def _term_add_end(tl, osize, size):
if osize: # osize should be None or >0, but that's been broken.
if size > osize: # Is ??? better? Really need something to say < vs >.
return tl.add(' !!! '), True
elif size != osize:
return tl.add(' ... '), True
return tl.add(' ' * 5), False
class TextMeter(BaseMeter):
def __init__(self, fo=sys.stderr):
BaseMeter.__init__(self)
self.fo = fo
def _do_update(self, amount_read, now=None):
etime = self.re.elapsed_time()
fread = format_number(amount_read)
# self.size = None
if self.text is not None:
text = self.text
else:
text = self.basename
ave_dl = format_number(self.re.average_rate())
sofar_size = None
if _text_meter_total_size:
sofar_size = _text_meter_sofar_size + amount_read
sofar_pc = (sofar_size * 100) // _text_meter_total_size
# Include text + ui_rate in minimal
tl = TerminalLine(8, 8 + 1 + 8)
# For big screens, make it more readable.
use_hours = bool(tl.llen > 80)
ui_size = tl.add(' | %5sB' % fread)
if self.size is None:
ui_time = tl.add(' %s' % format_time(etime, use_hours))
ui_end = tl.add(' ' * 5)
ui_rate = tl.add(' %5sB/s' % ave_dl)
out = '%-*.*s%s%s%s%s\r' % (tl.rest(), tl.rest(), text,
ui_rate, ui_size, ui_time, ui_end)
else:
rtime = self.re.remaining_time()
frtime = format_time(rtime, use_hours)
frac = self.re.fraction_read()
ui_time = tl.add(' %s' % frtime)
ui_end = tl.add(' ETA ')
if sofar_size is None:
ui_sofar_pc = ''
else:
ui_sofar_pc = tl.add(' (%i%%)' % sofar_pc,
full_len=len(" (100%)"))
ui_pc = tl.add(' %2i%%' % (frac * 100))
ui_rate = tl.add(' %5sB/s' % ave_dl)
# Make text grow a bit before we start growing the bar too
blen = 4 + tl.rest_split(8 + 8 + 4)
ui_bar = _term_add_bar(tl, blen, frac)
out = '\r%-*.*s%s%s%s%s%s%s%s\r' % (
tl.rest(), tl.rest(), text,
ui_sofar_pc, ui_pc, ui_bar,
ui_rate, ui_size, ui_time, ui_end
)
self.fo.write(out)
self.fo.flush()
def _do_end(self, amount_read, now=None):
global _text_meter_total_size
global _text_meter_sofar_size
total_size = format_number(amount_read)
if self.text is not None:
text = self.text
else:
text = self.basename
tl = TerminalLine(8)
# For big screens, make it more readable.
use_hours = bool(tl.llen > 80)
ui_size = tl.add(' | %5sB' % total_size)
ui_time = tl.add(' %s' % format_time(self.re.elapsed_time(),
use_hours))
ui_end, not_done = _term_add_end(tl, self.size, amount_read)
out = '\r%-*.*s%s%s%s\n' % (tl.rest(), tl.rest(), text,
ui_size, ui_time, ui_end)
self.fo.write(out)
self.fo.flush()
# Don't add size to the sofar size until we have all of it.
# If we don't have a size, then just pretend/hope we got all of it.
if not_done:
return
if _text_meter_total_size:
_text_meter_sofar_size += amount_read
if _text_meter_total_size <= _text_meter_sofar_size:
_text_meter_total_size = 0
_text_meter_sofar_size = 0
text_progress_meter = TextMeter
######################################################################
# support classes and functions
class RateEstimator:
def __init__(self, timescale=5.0):
self.timescale = timescale
self.total = None
self.start_time = None
self.last_update_time = None
self.last_amount_read = 0
self.ave_rate = None
def start(self, total=None, now=None):
if now is None:
now = time.time()
self.total = total
self.start_time = now
self.last_update_time = now
self.last_amount_read = 0
self.ave_rate = None
def update(self, amount_read, now=None):
if now is None:
now = time.time()
# libcurl calls the progress callback when fetching headers
# too, thus amount_read = 0 .. hdr_size .. 0 .. content_size.
# Occasionally we miss the 2nd zero and report avg speed < 0.
# Handle read_diff < 0 here. BZ 1001767.
if amount_read == 0 or amount_read < self.last_amount_read:
# if we just started this file, all bets are off
self.last_update_time = now
self.last_amount_read = amount_read
self.ave_rate = None
return
time_diff = now - self.last_update_time
read_diff = amount_read - self.last_amount_read
# First update, on reget is the file size
if self.last_amount_read:
self.last_update_time = now
self.ave_rate = self._temporal_rolling_ave(
time_diff, read_diff, self.ave_rate, self.timescale)
self.last_amount_read = amount_read
#####################################################################
# result methods
def average_rate(self):
"get the average transfer rate (in bytes/second)"
return self.ave_rate
def elapsed_time(self):
"the time between the start of the transfer and the most recent update"
return self.last_update_time - self.start_time
def remaining_time(self):
"estimated time remaining"
if not self.ave_rate or not self.total:
return None
return (self.total - self.last_amount_read) / self.ave_rate
def fraction_read(self):
"""the fraction of the data that has been read
(can be None for unknown transfer size)"""
if self.total is None:
return None
elif self.total == 0:
return 1.0
else:
return float(self.last_amount_read) / self.total
#########################################################################
# support methods
def _temporal_rolling_ave(self, time_diff, read_diff, last_ave, timescale):
"""a temporal rolling average performs smooth averaging even when
updates come at irregular intervals. This is performed by scaling
the "epsilon" according to the time since the last update.
Specifically, epsilon = time_diff / timescale
As a general rule, the average will take on a completely new value
after 'timescale' seconds."""
epsilon = time_diff / timescale
if epsilon > 1:
epsilon = 1.0
return self._rolling_ave(time_diff, read_diff, last_ave, epsilon)
def _rolling_ave(self, time_diff, read_diff, last_ave, epsilon):
"""perform a "rolling average" iteration
a rolling average "folds" new data into an existing average with
some weight, epsilon. epsilon must be between 0.0 and 1.0 (inclusive)
a value of 0.0 means only the old value (initial value) counts,
and a value of 1.0 means only the newest value is considered."""
try:
recent_rate = read_diff / time_diff
except ZeroDivisionError:
recent_rate = None
if last_ave is None:
return recent_rate
elif recent_rate is None:
return last_ave
# at this point, both last_ave and recent_rate are numbers
return epsilon * recent_rate + (1 - epsilon) * last_ave
def _round_remaining_time(self, rt, start_time=15.0):
"""round the remaining time, depending on its size
If rt is between n*start_time and (n+1)*start_time round downward
to the nearest multiple of n (for any counting number n).
If rt < start_time, round down to the nearest 1.
For example (for start_time = 15.0):
2.7 -> 2.0
25.2 -> 25.0
26.4 -> 26.0
35.3 -> 34.0
63.6 -> 60.0
"""
if rt < 0:
return 0.0
shift = int(math.log(rt / start_time) / math.log(2))
rt = int(rt)
if shift <= 0:
return rt
return float(int(rt) >> shift << shift)
def format_time(seconds, use_hours=0):
if seconds is None or seconds < 0:
if use_hours:
return '--:--:--'
else:
return '--:--'
elif seconds == float('inf'):
return 'Infinite'
else:
seconds = int(seconds)
minutes = seconds // 60
seconds = seconds % 60
if use_hours:
hours = minutes // 60
minutes = minutes % 60
return '%02i:%02i:%02i' % (hours, minutes, seconds)
else:
return '%02i:%02i' % (minutes, seconds)
def format_number(number, SI=0, space=' '):
"""Turn numbers into human-readable metric-like numbers"""
symbols = ['', # (none)
'k', # kilo
'M', # mega
'G', # giga
'T', # tera
'P', # peta
'E', # exa
'Z', # zetta
'Y'] # yotta
if SI:
step = 1000.0
else:
step = 1024.0
thresh = 999
depth = 0
max_depth = len(symbols) - 1
number = number or 0
# we want numbers between 0 and thresh, but don't exceed the length
# of our list. In that event, the formatting will be screwed up,
# but it'll still show the right number.
while number > thresh and depth < max_depth:
depth = depth + 1
number = number / step
if isinstance(number, int):
# it's an int or a long, which means it didn't get divided,
# which means it's already short enough
fmt = '%i%s%s'
elif number < 9.95:
# must use 9.95 for proper sizing. For example, 9.99 will be
# rounded to 10.0 with the .1f format string (which is too long)
fmt = '%.1f%s%s'
else:
fmt = '%.0f%s%s'
return(fmt % (float(number or 0), space, symbols[depth]))
# virtinst additions
def make_meter(quiet):
if quiet:
return BaseMeter()
return TextMeter(fo=sys.stdout)
def ensure_meter(meter):
if meter:
return meter
return make_meter(quiet=True)
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