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pmeter.py
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import sys
import time
import threading
tfunc = time.time
if sys.platform == "win32":
tfunc = time.clock
def format_sec(sec):
sec = int(sec)
min_, sec = divmod(sec, 60)
hour, min_ = divmod(min_, 60)
return '%d:%02d:%02d' % (hour, min_, sec)
class ETA(object):
'''
calculate ETA
'''
def __init__(self, wanted_size, max_point=20, max_seconds=30):
self.wanted_size = wanted_size
self.points = list()
self.max_point = max_point
self.max_seconds = max_seconds
self.points.append([tfunc(), 0])
self.eta = 'TBD'
def _cleanup(self):
if len(self.points) < 2:
return 0
else:
last_point_time = self.points[-1][0]
while len(self.points) > 2:
if (last_point_time - self.points[0][0] > self.max_seconds and
len(self.points) > self.max_point):
self.points.pop(0)
else:
break
return 1
def update(self, cursize):
self.points.append([tfunc(), cursize])
if self._cleanup() == 0:
return
delta_time = self.points[-1][0] - self.points[0][0]
delta_work = self.points[-1][1] - self.points[0][1]
speed = float(delta_work) / float(delta_time)
if speed == 0.0:
return
eta = (float(self.wanted_size) - float(cursize)) / float(speed)
self.eta = format_sec(eta + 1)
def getstatus(self):
return self.eta
class ProgressMeter(object):
def __init__(self, steps=63, min_update_delta=0.20, outstream=sys.stdout):
self.wantsteps = steps
self.prev_message = ''
self.last_update_time = -100
self.needrefresh = 1
self.times = list()
self.done_char = '='
self.left_char = ' '
self.eta_calculator = None
# max 25 fps on redraw
self.min_update_delta = max(min_update_delta, 0.04)
self.outstream = outstream
self.work_mutex = threading.Lock()
self.size = None
self.label = None
self.steps = None
self.start_time = tfunc()
def init(self, size, label='', cursize=0):
self.size = size
self.label = label
self.steps = self.wantsteps - len(label)
self.needrefresh = 1
self.prev_message = ''
self.start_time = tfunc()
self.eta_calculator = ETA(size)
self.update(cursize)
self.last_update_time = -100
def set_complete(self):
self.needrefresh = 1
self.update(self.size)
print
def _rawupdate(self, cursize):
self.eta_calculator.update(cursize)
donesteps = (cursize * self.steps) / self.size
stepsleft = self.steps - donesteps
percent = 100.0 * float(cursize) / float(self.size)
percent_str = '%3.0f%%' % percent
if cursize == self.size:
percent = 100.0
eta = format_sec(tfunc() - self.start_time)
else:
eta = self.eta_calculator.getstatus()
message = '%s %s[%s>%s] %s' % (
self.label,
percent_str,
self.done_char * donesteps,
self.left_char * stepsleft,
eta
)
self.outstream.write('\b' * len(self.prev_message) + message)
self.outstream.flush()
self.prev_message = message
self.last_update_time = tfunc()
def update_left(self, left):
'''
Update by remaining instead of used.
'''
self.update(self.size - left)
def update(self, cursize):
self.work_mutex.acquire()
if self.needrefresh:
self._rawupdate(cursize)
self.needrefresh = 0
else:
delta = tfunc() - self.last_update_time
if delta < self.min_update_delta:
pass
else:
self._rawupdate(cursize)
self.work_mutex.release()
def cleanup(self):
self.work_mutex.acquire()
if not self.needrefresh:
self.outstream.write('\r' + ' ' * len(self.prev_message) + '\r')
self.needrefresh = 1
self.work_mutex.release()
if __name__ == '__main__':
progress = ProgressMeter(30, outstream=sys.stderr)
progress.init(500)
for i in range(500 + 1):
time.sleep(0.01)
progress.update(i)
progress.cleanup()