Contract con_lend_test5


Contract Code


  
1 I = importlib
2
3 import currency as tau
4 import con_lusd_lst001 as lusd
5
6 lending = Hash(default_value="")
7 approve = Hash(default_value="")
8 withdrawals = Hash(default_value="")
9
10 OPERATORS = [
11 "ae7d14d6d9b8443f881ba6244727b69b681010e782d4fe482dbfb0b6aca02d5d",
12 "6351a80d32cbb3c173e490b093a95b15bcf4f6190251863669202d7fe2257af3"
13 ]
14
15 @export
16 def supply(key: str, tau_amount: float, tau_fee_amount: float,
17 time_in_hours: int, lusd_amount_collateral: float, for_address: str = None):
18
19 assert not lending[key], 'Lending KEY already exists'
20 assert tau_amount > 0, "TAU amount must be > 0!"
21 assert tau_fee_amount > 0, "TAU fee amount must be > 0!"
22 assert time_in_hours > 0, "Timeframe must be > 0!"
23 assert lusd_amount_collateral > 0, "Collateral amount must be > 0!"
24
25 tau.transfer_from(amount=tau_amount, to=ctx.this, main_account=ctx.caller)
26
27 lending[key] = {
28 "tau_amount": tau_amount,
29 "tau_fee_amount": tau_fee_amount,
30 "time_in_hours": time_in_hours,
31 "lusd_amount_collateral": lusd_amount_collateral,
32 "for_address": for_address,
33 "start_date": now,
34 "end_date": now + datetime.timedelta(hours=time_in_hours),
35 "lender": ctx.caller,
36 "borrower": None,
37 "state": "OPEN"
38 }
39
40 @export
41 def borrow(key: str):
42 assert lending[key], 'KEY does not exist!'
43
44 data = lending[key]
45
46 if data["for_address"]:
47 assert data["for_address"] == ctx.caller, f"Reserved for {data['for_address']}"
48
49 assert data["state"] == "OPEN", f"Wrong state: {data['state']}"
50 assert data["end_date"] > now, "Lending enddate reached"
51
52 tau.transfer(amount=data["tau_amount"], to=ctx.caller)
53 lusd.transfer_from(amount=data["lusd_amount_collateral"], to=ctx.this, main_account=ctx.caller)
54
55 data["state"] = "BORROWED"
56 data["borrower"] = ctx.caller
57 lending[key] = data
58
59 @export
60 def payback(key: str):
61 assert lending[key], 'KEY does not exist!'
62
63 data = lending[key]
64
65 assert data["borrower"] == ctx.caller, "You are not the borrower"
66 assert data["end_date"] > now, "Enddate exceeded, colletaral lost"
67 assert data["state"] == "BORROWED", f"Wrong state: {data['state']}"
68
69 total_tau_amount = data["tau_amount"] + data["tau_fee_amount"]
70 tau.transfer_from(amount=total_tau_amount, to=data["lender"], main_account=ctx.caller)
71 lusd.transfer(amount=data["lusd_amount_collateral"], to=ctx.caller)
72
73 data["state"] = "RETURNED"
74 lending[key] = data
75
76 @export
77 def cancel(key: str):
78 assert lending[key], 'KEY does not exist!'
79
80 data = lending[key]
81
82 assert data["lender"] == ctx.caller, "You are not the lender"
83 assert data["state"] == "OPEN", f"Wrong state: {data['state']}"
84
85 tau.transfer(amount=data["tau_amount"], to=ctx.caller)
86
87 data["state"] = "CANCELED"
88 lending[key] = data
89
90 @export
91 def liquidate(key: str):
92 assert lending[key], 'KEY does not exist!'
93
94 data = lending[key]
95
96 assert data["lender"] == ctx.caller, "You are not the lender"
97 assert data["end_date"] < now, "Enddate not reached"
98 assert data["state"] == "BORROWED", f"Wrong state: {data['state']}"
99
100 lusd.transfer(amount=data["lusd_amount_collateral"], to=ctx.caller)
101
102 data["state"] = "LIQUIDATED"
103 lending[key] = data
104
105 @export
106 def agree_to_withdraw(contract: str, amount: float):
107 assert_caller_is_operator()
108
109 agreed = True
110 agreement = "agreed"
111 key = f"{contract}_{amount}"
112 withdrawals[key, ctx.caller] = agreement
113
114 for op in OPERATORS:
115 if withdrawals[key, op] != withdrawals[key, ctx.caller]:
116 agreed = False
117 break
118
119 if agreed:
120 withdrawals[key] = agreement
121
122 for op in OPERATORS:
123 withdrawals[key, op] = ""
124
125 return f'{key} = {agreement}'
126
127 @export
128 def withdraw(contract: str, amount: float):
129 assert_caller_is_operator()
130
131 key = f"{contract}_{amount}"
132 if withdrawals[key] == "agreed":
133 I.import_module(contract).transfer(amount=decimal(amount), to=ctx.caller)
134 withdrawals[key] = "done"
135
136 return f"{key} = {withdrawals[key]}"
137
138 def assert_caller_is_operator():
139 assert ctx.caller in OPERATORS, "Executable only by operator"
140

Byte Code

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