Contract con_optic_lst001

  

    

      

        

            
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balances = Hash(default_value=0)

          

            
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metadata = Hash()

          

            
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@construct

          

            
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def seed():

          

            
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    balances[ctx.caller] = 500_000_000 

          

            
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    metadata['token_name'] = "OPTIC"

          

            
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    metadata['token_symbol'] = "OPTIC"

          

            
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    metadata['operator'] = ctx.caller

          

            
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@export

          

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

          

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

          

            
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    metadata[key] = value

          

            
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@export

          

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

          

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

          

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

          

            
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    balances[ctx.caller] -= amount

          

            
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    balances[to] += amount

          

            
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@export

          

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

          

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

          

            
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    balances[ctx.caller, to] += amount

          

            
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@export

          

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

          

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

          

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

          

            
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        .format(balances[main_account, ctx.caller], amount)

          

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

          

            
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    balances[main_account, ctx.caller] -= amount

          

            
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    balances[main_account] -= amount

          

            
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    balances[to] += amount
          
      
    
  
  

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