/usr/share/pyshared/glance/common/animation.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2012 OpenStack LLC.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sys
import threading
import time
from glance.common import exception
from glance.common import utils
class UploadProgressStatus(threading.Thread):
"""
A class for showing:
1. progress;
2. rate;
3. ETA;
4. and status, e.g. active or stalled.
In order to sample the rate as closely as possible, this
implementation uses two FIFO buffers (times and bytes)
to record fine-grain transfer rate over a period of time.
"""
NUM_OF_ELEMENTS = 20 # number of element in FIFO
TIME_TO_STALL = 5 # if no data transfer longer this
# time(secs), the network will be
# considered as stalled.
REFRESH_STATUS_INTERVAL = 0.1 # time interval to refresh screen
MIN_SAMPLING_INTERVAL = 0.15 # Minimum sampling time for data
CALC_ETA_WITH_AVE_RATE = True # calc eta with average rate
def __init__(self, transfer_info):
self.current_size = 0L
self.size = transfer_info['size']
self.last_start = 0.0
self.last_bytes = 0L
self.elapsed_time = 0.0
self.total_times = 0.0
self.total_bytes = 0L
self.nelements = self.NUM_OF_ELEMENTS
self.times = [0.0, ] * self.nelements
self.bytes = [0L, ] * self.nelements
self.index = 0
self.stalled = False
self.transfer_info = transfer_info
threading.Thread.__init__(self)
def run(self):
self.start = self.last_start = time.time()
while self.current_size != self.size:
time.sleep(self.REFRESH_STATUS_INTERVAL)
bytes = self.transfer_info['so_far']
self.sampling(bytes, time.time())
self.render()
sys.stdout.write("\n")
sys.stdout.flush()
def _reset_buffer(self):
self.times = [0.0, ] * self.nelements
self.bytes = [0L, ] * self.nelements
def _update(self, bytes, time):
self.elapsed_time = time - self.last_start
transferred_bytes = bytes - self.current_size
self.last_bytes += transferred_bytes
self.current_size += transferred_bytes
if self.elapsed_time < self.MIN_SAMPLING_INTERVAL:
return False
if transferred_bytes == 0:
if self.elapsed_time > self.TIME_TO_STALL:
self.stalled = True
self._reset_buffer()
self.last_bytes = 0
return False
if self.stalled:
self.stalled = False
self.elapsed_time = 1.0
return True
def render(self):
fraction = self.current_size / float(self.size)
percentage = fraction * 100.0
str_percent = "[%3d%%]" % percentage
try:
height, width = utils.get_terminal_size()
sys.stdout.write("\b" * width)
eta = self._calc_eta()
rate = self._get_speed()
width -= len(eta)
width -= len(rate)
bar = ('=' * int((width - len(str_percent)) * fraction)
+ str_percent)
padding = ' ' * (width - len(bar))
sys.stdout.write(bar + padding + rate + eta)
sys.stdout.flush()
except (exception.Invalid, NotImplementedError):
sys.stdout.write("\b" * 6) # use the len of [%3d%%]
percent = (str_percent + ' '
if self.current_size == self.size else str_percent)
percent += ' ' + self._get_speed() + 'ETA ' + self._calc_eta()
sys.stdout.write(percent)
sys.stdout.write("\b" * len(percent))
sys.stdout.flush()
def _get_speed(self):
speed, unit = self._calc_speed()
if speed > 0.0:
if speed >= 99.95:
rate = "%4f" % speed
elif speed >= 9.995:
rate = "%4.1f" % speed
else:
rate = "%4.2f" % speed
return " " + rate + unit + ", "
else:
return " ?B/s "
def _calc_eta(self):
if self.stalled or self.current_size < self.size * 0.01:
return "ETA ??h ??m ??s"
if self.CALC_ETA_WITH_AVE_RATE:
eta = ((self.size - self.current_size)
* (time.time() - self.start) / self.current_size)
else:
eta = (((self.size - self.current_size)
* self.total_times) / (self.total_bytes))
eta = int(eta)
hrs = mins = secs = 0
hrs = eta / 3600
secs = eta - hrs * 3600
if secs >= 60:
mins = secs / 60
secs = secs % 60
return "ETA %dh %2dm %2ds" % (hrs, mins, secs)
def _calc_speed(self):
idx = 0
units = ('B/s', 'K/s', 'M/s', 'G/s')
total_times = self.total_times + time.time() - self.last_start
total_bytes = self.total_bytes + self.last_bytes
if self.stalled or total_times == 0:
return None, None
speed = total_bytes / float(total_times)
if speed < 1024:
idx = 0
elif speed < 1048576.: # 1024*1024
idx = 1
speed /= 1024.
elif speed < 1073741824.: # 1024*1024*1024
idx = 2
speed /= 1048576.
else:
idx = 3
speed /= 1073741824.
return speed, units[idx]
def sampling(self, bytes, time):
if not self._update(bytes, time):
return
self.total_times -= self.times[self.index]
self.total_bytes -= self.bytes[self.index]
self.times[self.index] = self.elapsed_time
self.bytes[self.index] = self.last_bytes
self.total_times += self.elapsed_time
self.total_bytes += self.last_bytes
self.last_start = time
self.last_bytes = 0L
self.index += 1
if self.index == self.nelements:
self.index = 0
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