Contract con_lending

  

    

      

        

            
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I = importlib
          

            
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import currency as tau
          

            
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import con_lusd_lst001 as lusd
          

            
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lending = Hash(default_value="")
          

            
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approve = Hash(default_value="")
          

            
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withdrawals = Hash(default_value="")
          

            
9
            

          

            
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OPERATORS = [
          

            
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    "ae7d14d6d9b8443f881ba6244727b69b681010e782d4fe482dbfb0b6aca02d5d",
          

            
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    "1df02727c7cc50776e08532f088c17b31be0cb8a302df1c506c8c114a72c0b8c"
          

            
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]
          

            
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@export
          

            
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def supply(key: str, tau_amount: float, tau_fee_amount: float, 
          

            
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    time_in_hours: int, lusd_amount_collateral: float, for_address: str = None):
          

            
18
            
    
          

            
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    assert not lending[key], 'Lending KEY already exists'
          

            
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    assert tau_amount > 0, "TAU amount must be > 0!"
          

            
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    assert tau_fee_amount > 0, "TAU fee amount must be > 0!"
          

            
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    assert time_in_hours > 0, "Timeframe must be > 0!"
          

            
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    assert lusd_amount_collateral > 0, "Collateral amount must be > 0!"
          

            
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    tau.transfer_from(amount=tau_amount, to=ctx.this, main_account=ctx.caller)
          

            
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    lending[key] = {
          

            
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        "tau_amount": tau_amount, 
          

            
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        "tau_fee_amount": tau_fee_amount, 
          

            
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        "time_in_hours": time_in_hours, 
          

            
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        "lusd_amount_collateral": lusd_amount_collateral, 
          

            
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        "for_address": for_address, 
          

            
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        "start_date": now, 
          

            
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        "end_date": now + datetime.timedelta(hours=time_in_hours),
          

            
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        "lender": ctx.caller, 
          

            
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        "borrower": None,
          

            
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        "state": "OPEN"
          

            
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    }
          

            
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@export
          

            
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def borrow(key: str):
          

            
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    assert lending[key], 'KEY does not exist!'
          

            
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    data = lending[key]
          

            
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    if data["for_address"]:
          

            
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        assert data["for_address"] == ctx.caller, f"Reserved for {data['for_address']}"
          

            
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    assert data["state"] == "OPEN", f"Wrong state: {data['state']}"
          

            
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    assert data["end_date"] > now, "Lending enddate reached"
          

            
51
            

          

            
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    tau.transfer(amount=data["tau_amount"], to=ctx.caller)
          

            
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    lusd.transfer_from(amount=data["lusd_amount_collateral"], to=ctx.this, main_account=ctx.caller)
          

            
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    data["state"] = "BORROWED"
          

            
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    data["borrower"] = ctx.caller
          

            
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    lending[key] = data
          

            
58
            

          

            
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@export
          

            
60
            
def payback(key: str):
          

            
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    assert lending[key], 'KEY does not exist!'
          

            
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    data = lending[key]
          

            
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    assert data["borrower"] == ctx.caller, "You are not the borrower"
          

            
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    assert data["end_date"] > now, "Enddate exceeded, colletaral lost"
          

            
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    assert data["state"] == "BORROWED", f"Wrong state: {data['state']}"
          

            
68
            

          

            
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    total_tau_amount = data["tau_amount"] + data["tau_fee_amount"]
          

            
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    tau.transfer_from(amount=total_tau_amount, to=data["lender"], main_account=ctx.caller)
          

            
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    lusd.transfer(amount=data["lusd_amount_collateral"], to=ctx.caller)
          

            
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    data["state"] = "RETURNED"
          

            
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    lending[key] = data
          

            
75
            

          

            
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@export
          

            
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def cancel(key: str):
          

            
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    assert lending[key], 'KEY does not exist!'
          

            
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    data = lending[key]
          

            
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    assert data["lender"] == ctx.caller, "You are not the lender"
          

            
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    assert data["state"] == "OPEN", f"Wrong state: {data['state']}"
          

            
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    tau.transfer(amount=data["tau_amount"], to=ctx.caller)
          

            
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    data["state"] = "CANCELED"
          

            
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    lending[key] = data
          

            
89
            

          

            
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@export
          

            
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def liquidate(key: str):
          

            
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    assert lending[key], 'KEY does not exist!'
          

            
93
            

          

            
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    data = lending[key]
          

            
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    assert data["lender"] == ctx.caller, "You are not the lender"
          

            
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    assert data["end_date"] < now, "Enddate not reached"
          

            
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    assert data["state"] == "BORROWED", f"Wrong state: {data['state']}"
          

            
99
            

          

            
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    lusd.transfer(amount=data["lusd_amount_collateral"], to=ctx.caller)
          

            
101
            

          

            
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    data["state"] = "LIQUIDATED"
          

            
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    lending[key] = data
          

            
104
            

          

            
105
            
@export
          

            
106
            
def agree_to_withdraw(contract: str, amount: str):
          

            
107
            
    assert_caller_is_operator()
          

            
108
            

          

            
109
            
    agreed = True
          

            
110
            
    agreement = "agreed"
          

            
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    key = f"{contract}#{amount}"
          

            
112
            
    withdrawals[key, ctx.caller] = agreement
          

            
113
            

          

            
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    for op in OPERATORS:
          

            
115
            
        if withdrawals[key, op] != withdrawals[key, ctx.caller]:
          

            
116
            
            agreed = False
          

            
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            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: str):
          

            
129
            
    assert_caller_is_operator()
          

            
130
            

          

            
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    key = f"{contract}#{amount}"
          

            
132
            

          

            
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    assert withdrawals[key] == "agreed", "No agreement met"
          

            
134
            

          

            
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    I.import_module(contract).transfer(amount=decimal(amount), to=ctx.caller)
          

            
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    withdrawals[key] = "done"
          

            
137
            

          

            
138
            
    return f"{key} = {withdrawals[key]}"
          

            
139
            

          

            
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def assert_caller_is_operator():
          

            
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    assert ctx.caller in OPERATORS, "Executable only by operator"
          

            
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