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# Copyright 2010, 2012 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import time
import ttystatus
class ByteSpeed(ttystatus.Widget):
'''Display data size in bytes, KiB, etc.'''
static_width = False
def __init__(self, name, duration=None):
self.name = name
self._duration = None if duration is None else float(duration)
self._data_points = []
def now(self): # pragma: no cover
'''Wrapper around time.time for unit tests to overrride.'''
return time.time()
def render(self, width):
units = (
(1024 ** 4, 2, 'TiB/s'),
(1024 ** 3, 2, 'GiB/s'),
(1024 ** 2, 2, 'MiB/s'),
(1024 ** 1, 1, 'KiB/s'),
)
if len(self._data_points) < 2:
return '0 B/s'
oldest_bytes, started = self._data_points[0]
latest_bytes, dummy = self._data_points[-1]
num_bytes = latest_bytes - oldest_bytes
duration = self.now() - started
speed = num_bytes / duration
for factor, decimals, unit in units:
if speed >= factor:
return '%.*f %s' % (decimals,
float(speed) / float(factor),
unit)
return '%.0f B/s' % speed
def update(self, master):
num_bytes = master[self.name]
now = self.now()
self._data_points.append((num_bytes, now))
if self._duration is None:
if len(self._data_points) > 2:
del self._data_points[1:-1]
else:
cutoff = now - self._duration
while self._data_points[0][1] < cutoff:
del self._data_points[0]
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