1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
# SchellingCoin implementation
#
# Epoch length: 100 blocks
# Target savings depletion rate: 0.1% per epoch
data epoch
data hashes_submitted
data output
data quicksort_pairs
data accounts[2^160]
data submissions[2^80](hash, deposit, address, value)
extern any: [call]
def init():
self.epoch = block.number / 100
self.quicksort_pairs = create('quicksort_pairs.se')
def any():
if block.number / 100 > epoch:
# Sort all values submitted
N = self.hashes_submitted
o = array(N * 2)
i = 0
j = 0
while i < N:
v = self.submissions[i].value
if v:
o[j] = v
o[j + 1] = i
j += 2
i += 1
values = self.quicksort_pairs.call(data=o, datasz=j, outsz=j)
# Calculate total deposit, refund non-submitters and
# cleanup
deposits = array(j / 2)
addresses = array(j / 2)
i = 0
total_deposit = 0
while i < j / 2:
base_index = HASHES + values[i * 2 + 1] * 3
deposits[i] = self.submissions[i].deposit
addresses[i] = self.submissions[i].address
if self.submissions[values[i * 2 + 1]].value:
total_deposit += deposits[i]
else:
send(addresses[i], deposits[i] * 999 / 1000)
i += 1
inverse_profit_ratio = total_deposit / (contract.balance / 1000) + 1
# Reward everyone
i = 0
running_deposit_sum = 0
halfway_passed = 0
while i < j / 2:
new_deposit_sum = running_deposit_sum + deposits[i]
if new_deposit_sum > total_deposit / 4 and running_deposit_sum < total_deposit * 3 / 4:
send(addresses[i], deposits[i] + deposits[i] / inverse_profit_ratio * 2)
else:
send(addresses[i], deposits[i] - deposits[i] / inverse_profit_ratio)
if not halfway_passed and new_deposit_sum > total_deposit / 2:
self.output = self.submissions[i].value
halfway_passed = 1
self.submissions[i].value = 0
running_deposit_sum = new_deposit_sum
i += 1
self.epoch = block.number / 100
self.hashes_submitted = 0
def submit_hash(h):
if block.number % 100 < 50:
cur = self.hashes_submitted
pos = HASHES + cur * 3
self.submissions[cur].hash = h
self.submissions[cur].deposit = msg.value
self.submissions[cur].address = msg.sender
self.hashes_submitted = cur + 1
return(cur)
def submit_value(index, v):
if sha3([msg.sender, v], 2) == self.submissions[index].hash:
self.submissions[index].value = v
return(1)
def request_balance():
return(contract.balance)
def request_output():
return(self.output)
|
