]>
Commit | Line | Data |
---|---|---|
879aa787 MT |
1 | # Written by Bram Cohen |
2 | # see LICENSE.txt for license information | |
3 | ||
4 | from clock import clock | |
5 | try: | |
6 | True | |
7 | except: | |
8 | True = 1 | |
9 | False = 0 | |
10 | ||
11 | FACTOR = 0.999 | |
12 | ||
13 | class RateMeasure: | |
14 | def __init__(self): | |
15 | self.last = None | |
16 | self.time = 1.0 | |
17 | self.got = 0.0 | |
18 | self.remaining = None | |
19 | self.broke = False | |
20 | self.got_anything = False | |
21 | self.last_checked = None | |
22 | self.rate = 0 | |
23 | self.lastten = False | |
24 | ||
25 | def data_came_in(self, amount): | |
26 | if not self.got_anything: | |
27 | self.got_anything = True | |
28 | self.last = clock() | |
29 | return | |
30 | self.update(amount) | |
31 | ||
32 | def data_rejected(self, amount): | |
33 | pass | |
34 | ||
35 | def get_time_left(self, left): | |
36 | t = clock() | |
37 | if not self.got_anything: | |
38 | return None | |
39 | if t - self.last > 15: | |
40 | self.update(0) | |
41 | try: | |
42 | remaining = left/self.rate | |
43 | if not self.lastten and remaining <= 10: | |
44 | self.lastten = True | |
45 | if self.lastten: | |
46 | return remaining | |
47 | delta = max(remaining/20,2) | |
48 | if self.remaining is None: | |
49 | self.remaining = remaining | |
50 | elif abs(self.remaining-remaining) > delta: | |
51 | self.remaining = remaining | |
52 | else: | |
53 | self.remaining -= t - self.last_checked | |
54 | except ZeroDivisionError: | |
55 | self.remaining = None | |
56 | if self.remaining is not None and self.remaining < 0.1: | |
57 | self.remaining = 0.1 | |
58 | self.last_checked = t | |
59 | return self.remaining | |
60 | ||
61 | def update(self, amount): | |
62 | t = clock() | |
63 | t1 = int(t) | |
64 | l1 = int(self.last) | |
65 | for i in xrange(l1,t1): | |
66 | self.time *= FACTOR | |
67 | self.got *= FACTOR | |
68 | self.got += amount | |
69 | if t - self.last < 20: | |
70 | self.time += t - self.last | |
71 | self.last = t | |
72 | try: | |
73 | self.rate = self.got / self.time | |
74 | except ZeroDivisionError: | |
75 | pass |