bytes/sec

[Mike Fletcher]

Here's another take the on the problem, in this case, we assume the problem
was "How do I get those nicely formatted values that these programs show
which indicate total and current bandwidth?"  (The original post being
rather unclear as to what the problem was).

Here's the results of running the module in test mode:

p:\>p:\downloadprofiler.py
2.0 B/s total
2.0 B/s instant
257.2 B/s total
511.3 B/s instant
854.0 B/s total
2.0 KB/s instant
512.4 KB/s total
2.0 MB/s instant
409.8 MB/s total
2.0 GB/s instant
341.4 GB/s total
2.0 TB/s instant

Enjoy all, (this is largely untested, use at your own risk),
Mike

8<________ downloadprofiler.py _______
import time

KILOBYTES = 1024.0
MEGABYTES = KILOBYTES*1024
GIGABYTES = MEGABYTES*1024
TERABYTES = GIGABYTES*1024

SMALLTIME = 0.000000001

class DowloadProfiler:
	displayTemplates = [
		(TERABYTES, '%0.1f TB/s'), # ah, to have a terabyte/second
network connection :)
		(GIGABYTES, '%0.1f GB/s'),
		(MEGABYTES, '%0.1f MB/s'),
		(KILOBYTES, '%0.1f KB/s'),
		(0, '%0.1f B/s'),
	]
	def __init__( self ):
		self.received = 0L
	def start( self ):
		self.starttime = time.clock()
		self.previoustime = self.starttime
		self.instantaneous = 0
	def more( self, amount ):
		self.received = self.received + amount
		self.instantaneous = amount/ ((time.clock() -
self.previoustime) or SMALLTIME)
		self.previoustime = time.clock()
	def displayTotal( self ):
		return self._display( self.received/
((time.clock()-self.starttime) or SMALLTIME) )
	def displayInstant( self ):
		return self._display( self.instantaneous )
	def _display( self, amount ):
		for threshold, template in self.displayTemplates:
			if amount > threshold:
				if threshold:
					amount = amount/threshold
				return template % amount

def test():
	d = DowloadProfiler()
	d.start()
	for data in (2, 512, 2*KILOBYTES, 2*MEGABYTES, 2*GIGABYTES,
2*TERABYTES ):
		time.sleep( 1)
		d.more( data )
		print d.displayTotal(), 'total'
		print d.displayInstant(), 'instant'
if __name__ == "__main__":
	test()