4 from p2pool.util import forest, math
5 from p2pool.bitcoin import data as bitcoin_data
7 class DumbTracker(object):
8 def __init__(self, shares=[]):
9 self.shares = {} # hash -> share
10 self.reverse_shares = {} # previous_hash -> set of share_hashes
16 if share.hash in self.shares:
17 raise ValueError('share already present')
18 self.shares[share.hash] = share
19 self.reverse_shares.setdefault(share.previous_hash, set()).add(share.hash)
21 def remove(self, share_hash):
22 share = self.shares[share_hash]
25 self.shares.pop(share.hash)
26 self.reverse_shares[share.previous_hash].remove(share.hash)
27 if not self.reverse_shares[share.previous_hash]:
28 self.reverse_shares.pop(share.previous_hash)
32 return dict((x, self.get_last(x)) for x in self.shares if x not in self.reverse_shares)
36 return dict((x, set(y for y in self.shares if self.get_last(y) == x and y not in self.reverse_shares)) for x in self.reverse_shares if x not in self.shares)
38 def get_height(self, share_hash):
39 height, work, last = self.get_height_work_and_last(share_hash)
42 def get_work(self, share_hash):
43 height, work, last = self.get_height_work_and_last(share_hash)
46 def get_last(self, share_hash):
47 height, work, last = self.get_height_work_and_last(share_hash)
50 def get_height_and_last(self, share_hash):
51 height, work, last = self.get_height_work_and_last(share_hash)
54 def get_nth_parent_hash(self, share_hash, n):
56 share_hash = self.shares[share_hash].previous_hash
59 def get_height_work_and_last(self, share_hash):
62 while share_hash in self.shares:
63 share_hash, work_inc = self.shares[share_hash].previous_hash, bitcoin_data.target_to_average_attempts(self.shares[share_hash].target)
66 return height, work, share_hash
68 def get_chain(self, start_hash, length):
69 # same implementation :/
70 assert length <= self.get_height(start_hash)
71 for i in xrange(length):
72 yield self.shares[start_hash]
73 start_hash = self.shares[start_hash].previous_hash
75 def is_child_of(self, share_hash, possible_child_hash):
76 if self.get_last(share_hash) != self.get_last(possible_child_hash):
79 if possible_child_hash == share_hash:
81 if possible_child_hash not in self.shares:
83 possible_child_hash = self.shares[possible_child_hash].previous_hash
85 class FakeShare(object):
87 def __init__(self, **kwargs):
88 for k, v in kwargs.iteritems():
93 return 'FakeShare(' + ', '.join('%s=%r' % (k, v) for k, v in self._attrs.iteritems()) + ')'
95 def test_tracker(self):
96 t = DumbTracker(self.shares.itervalues())
98 assert self.shares == t.shares, (self.shares, t.shares)
99 assert self.reverse_shares == t.reverse_shares, (self.reverse_shares, t.reverse_shares)
100 assert self.heads == t.heads, (self.heads, t.heads)
101 assert self.tails == t.tails, (self.tails, t.tails)
103 for start in self.shares:
104 a, b = self.get_height_work_and_last(start), t.get_height_work_and_last(start)
105 assert a == b, (a, b)
107 other = random.choice(self.shares.keys())
108 assert self.is_child_of(start, other) == t.is_child_of(start, other)
109 assert self.is_child_of(other, start) == t.is_child_of(other, start)
111 assert list(self.get_chain(start, min(a[0], 10))) == list(t.get_chain(start, min(a[0], 10)))
113 def generate_tracker_simple(n):
114 t = forest.Tracker(math.shuffled(FakeShare(hash=i, previous_hash=i - 1 if i > 0 else None) for i in xrange(n)))
118 def generate_tracker_random(n):
121 x = random.choice(shares + [FakeShare(hash=None), FakeShare(hash=random.randrange(1000000, 2000000))]).hash
122 shares.append(FakeShare(hash=i, previous_hash=x))
123 t = forest.Tracker(math.shuffled(shares))
127 class Test(unittest.TestCase):
128 def test_tracker(self):
129 t = generate_tracker_simple(1000)
131 assert t.heads == {999: None}
132 assert t.tails == {None: set([999])}
134 assert t.get_nth_parent_hash(900, 500) == 900 - 500
135 assert t.get_nth_parent_hash(901, 42) == 901 - 42
137 def test_get_nth_parent_hash(self):
138 t = generate_tracker_simple(200)
140 for i in xrange(1000):
141 a = random.randrange(200)
142 b = random.randrange(a + 1)
143 res = t.get_nth_parent_hash(a, b)
144 assert res == a - b, (a, b, res)
146 def test_tracker2(self):
147 for ii in xrange(50):
148 t = generate_tracker_random(random.randrange(100))
151 x = random.choice(list(t.shares))
154 except NotImplementedError:
155 pass # print "aborted", x