Contract con_october_stake

  

    

      

        

            
1
            
tad_contract = importlib.import_module('con_october_tad')
          

            
2
            
vault_contract = importlib.import_module('con_october_vault')
          

            
3
            

          

            
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rate = Hash()
          

            
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balances = Hash(default_value=0)
          

            
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metadata = Hash()
          

            
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total_minted = Variable()
          

            
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operator = Variable()
          

            
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temporary_var = Variable()
          

            
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@construct
          

            
16
            
def seed():
          

            
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    operator.set(ctx.caller)
          

            
18
            

          

            
19
            
    rate['start_time'] = get_timestamp()
          

            
20
            
    rate['rate'] = 1.0000000015469297  # interest per second
          

            
21
            
    rate['start_price'] = 1
          

            
22
            

          

            
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    metadata['token_name'] = 'Staked tad'
          

            
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    metadata['token_symbol'] = 'stad'
          

            
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    metadata['token_logo_url'] = 'image.site'
          

            
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    metadata['operator'] = ctx.caller
          

            
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    total_minted.set(0)
          

            
28
            

          

            
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30
            
@export
          

            
31
            
def get_timestamp():
          

            
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    # https://developers.lamden.io/docs/smart-contracts/datetime-module/
          

            
33
            
    td = now - datetime.datetime(1970, 1, 1, 0, 0, 0)
          

            
34
            
    return fix_decimal(td.seconds)
          

            
35
            

          

            
36
            

          

            
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@export
          

            
38
            
def stake(amount: float):
          

            
39
            
    assert amount > 0, 'Stake amount must be positive!'
          

            
40
            
    tad_contract.transfer_from(
          

            
41
            
        to=ctx.this, amount=amount, main_account=ctx.caller)
          

            
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43
            
    amount_minted = amount / get_price()
          

            
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    total = total_minted.get() + amount_minted
          

            
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    total_minted.set(total)
          

            
46
            

          

            
47
            
    balances[ctx.caller] += amount_minted
          

            
48
            

          

            
49
            
    return amount_minted
          

            
50
            

          

            
51
            

          

            
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@export
          

            
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def withdraw_stake(amount: float):
          

            
54
            
    assert amount > 0, 'Stake amount must be positive!'
          

            
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    assert balances[ctx.caller] >= amount, 'Not enough coins to withdraw!'
          

            
56
            

          

            
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    balances[ctx.caller] -= amount
          

            
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    current_price = get_price()
          

            
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    return_amount = current_price * amount
          

            
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    supply = total_minted.get()
          

            
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    current_average = fix_decimal(supply / tad_contract.balance_of(ctx.this))
          

            
64
            
    transfer_away_amount = amount * current_average
          

            
65
            

          

            
66
            
    total_minted.set(supply - amount)
          

            
67
            
    if return_amount - transfer_away_amount > 0:
          

            
68
            
        vault_contract.mint_rewards(
          

            
69
            
            amount=return_amount - transfer_away_amount)
          

            
70
            

          

            
71
            
    tad_contract.transfer(amount=return_amount, to=ctx.caller)
          

            
72
            

          

            
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    return return_amount
          

            
74
            

          

            
75
            

          

            
76
            
@export
          

            
77
            
def change_rate(new_rate: float):  # takes yearly interest as decimal
          

            
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    assert_owner()
          

            
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    assert new_rate >= 0, 'Cannot have negative staking!'
          

            
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    current_price = get_price()
          

            
82
            

          

            
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    rate['start_time'] = get_timestamp()
          

            
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    rate['rate'] = new_rate  # interest per second
          

            
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    rate['start_price'] = current_price
          

            
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87
            

          

            
88
            
@export
          

            
89
            
def transfer(amount: float, to: str):
          

            
90
            
    assert amount > 0, 'Cannot send negative balances!'
          

            
91
            

          

            
92
            
    sender = ctx.caller
          

            
93
            

          

            
94
            
    assert balances[sender] >= amount, 'Not enough coins to send!'
          

            
95
            

          

            
96
            
    balances[sender] -= amount
          

            
97
            
    balances[to] += amount
          

            
98
            

          

            
99
            

          

            
100
            
@export
          

            
101
            
def balance_of(account: str):
          

            
102
            
    return balances[account]
          

            
103
            

          

            
104
            

          

            
105
            
@export
          

            
106
            
def allowance(owner: str, spender: str):
          

            
107
            
    return balances[owner, spender]
          

            
108
            

          

            
109
            

          

            
110
            
@export
          

            
111
            
def approve(amount: float, to: str):
          

            
112
            
    assert amount > 0, 'Cannot send negative balances!'
          

            
113
            
    sender = ctx.caller
          

            
114
            
    assert balances[sender] >= amount, 'Cannot approve balance that exceeds total balance!'
          

            
115
            
    balances[sender, to] += amount
          

            
116
            
    return balances[sender, to]
          

            
117
            

          

            
118
            

          

            
119
            
@export
          

            
120
            
def transfer_from(amount: float, to: str, main_account: str):
          

            
121
            
    assert amount > 0, 'Cannot send negative balances!'
          

            
122
            

          

            
123
            
    sender = ctx.caller
          

            
124
            

          

            
125
            
    assert balances[main_account] >= amount, 'Not enough coins to send!'
          

            
126
            
    assert balances[main_account, sender] >= amount, 'Not enough coins approved to send! You have {} and are trying to spend {}'\
          

            
127
            
        .format(balances[main_account, sender], amount)
          

            
128
            

          

            
129
            
    balances[main_account, sender] -= amount
          

            
130
            
    balances[main_account] -= amount
          

            
131
            

          

            
132
            
    balances[to] += amount
          

            
133
            

          

            
134
            

          

            
135
            
@export
          

            
136
            
def get_price():
          

            
137
            
    return rate['start_price'] * rate['rate'] ** (
          

            
138
            
        get_timestamp() - rate['start_time'])
          

            
139
            

          

            
140
            

          

            
141
            
@export
          

            
142
            
def change_metadata(key: str, value: Any):
          

            
143
            
    assert ctx.caller == metadata['operator'], 'Only operator can set metadata!'
          

            
144
            
    metadata[key] = value
          

            
145
            

          

            
146
            

          

            
147
            
@export
          

            
148
            
def change_owner(new_owner: str):
          

            
149
            
    assert_owner()
          

            
150
            
    operator.set(new_owner)
          

            
151
            

          

            
152
            

          

            
153
            
def assert_owner():
          

            
154
            
    assert ctx.caller == operator.get(), 'Only operator can call!'
          

            
155
            
    
          

            
156
            
    
          

            
157
            
def fix_decimal(old_decimal: float):
          

            
158
            
    temporary_var.set(old_decimal)
          

            
159
            
    new_decimal = temporary_var.get()
          

            
160
            
    
          

            
161
            
    return new_decimal
          

            
162
            

          
      
    
  
  

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