DAO/LP代幣質押流動性挖礦分紅系統開發（方案及專案）丨原始碼功能

　　#notice Convert ETH to Tokens.

　　#dev User specifies exact input(msg.value).

　　#dev User cannot specify minimum output or deadline.

　　#用ETH兌換代幣的預設函式，使用者只需要指定輸入的ETH的數量

　　public 

　　payable

　　def __default__():

　　self.ethToTokenInput(msg.value,1,block.timestamp,msg.sender,msg.sender)

　　　

　　#notice Convert ETH to Tokens.

　　#dev User specifies exact input(msg.value)and minimum output.所以接收的代幣最小值

　　#param min_tokens Minimum Tokens bought.

　　#param deadline Time after which this transaction can no longer be executed.

　　#return Amount of Tokens bought.

關於區塊鏈專案技術開發唯:MrsFu123，代幣發行、dapp智慧合約開發、鏈遊開發、多鏈錢包開發

　　交易所開發、量化合約開發、互助遊戲開發、Nft數字藏品開發、眾籌互助開發、元宇宙開發、swap開發、

　　鏈上合約開發、ido開發、商城開發等，開發過各種各樣的系統模式，更有多種模式、制度、案例、後臺等，成熟技術團隊，歡迎實體參考。

　　#ETH透過msg.value的方式傳送給代幣合約，代幣合約根據所接收到的ETH計算所需支付的代幣

　　public

　　payable

　　def ethToTokenSwapInput(min_tokens:uint256,deadline:timestamp)->uint256:

　　return self.ethToTokenInput(msg.value,min_tokens,deadline,msg.sender,msg.sender)

　　

　　#notice Convert ETH to Tokens and transfers Tokens to recipient.

　　#dev User specifies exact input(msg.value)and minimum output

　　#param min_tokens Minimum Tokens bought.

　　#param deadline Time after which this transaction can no longer be executed.

　　#param recipient The address that receives output Tokens.

　　#return Amount of Tokens bought.

　　public

　　payable

　　def ethToTokenTransferInput(min_tokens:uint256,deadline:timestamp,recipient:address)->uint256:

　　assert recipient!=self and recipient!=ZERO_ADDRESS

　　return self.ethToTokenInput(msg.value,min_tokens,deadline,msg.sender,recipient)

　　

　　#notice Convert ETH to Tokens.

　　#dev User specifies maximum input(msg.value)and exact output.

　　#param tokens_bought Amount of tokens bought.

　　#param deadline Time after which this transaction can no longer be executed.

　　#return Amount of ETH sold.

　　public

　　payable

　　def ethToTokenSwapOutput(tokens_bought:uint256,deadline:timestamp)->uint256(wei):

　　return self.ethToTokenOutput(tokens_bought,msg.value,deadline,msg.sender,msg.sender)

　　

　　#notice Convert ETH to Tokens and transfers Tokens to recipient.

　　#dev User specifies maximum input(msg.value)and exact output.

　　#param tokens_bought Amount of tokens bought.

　　#param deadline Time after which this transaction can no longer be executed.

　　#param recipient The address that receives output Tokens.

　　#return Amount of ETH sold.

　　public

　　payable

　　def ethToTokenTransferOutput(tokens_bought:uint256,deadline:timestamp,recipient:address)->uint256(wei):

　　assert recipient!=self and recipient!=ZERO_ADDRESS

　　return self.ethToTokenOutput(tokens_bought,msg.value,deadline,msg.sender,recipient)

　　

　　private

　　def ethToTokenInput(eth_sold:uint256(wei),min_tokens:uint256,deadline:timestamp,buyer:address,recipient:address)->uint256:

　　assert deadline>=block.timestamp and(eth_sold>0 and min_tokens>0)

　　token_reserve:uint256=self.token.balanceOf(self)#獲取代幣儲備量

　　#用getInputPrice獲得所購買得到的代幣數量

　　#因為交易是先轉賬再執行合約，所以獲得ETH儲備量的時候需要先減去該買者已經傳送的ETH

　　tokens_bought:uint256=self.getInputPrice(as_unitless_number(eth_sold),as_unitless_number(self.balance-eth_sold),token_reserve)

　　assert tokens_bought>=min_tokens

　　assert self.token.transfer(recipient,tokens_bought)#向接收者傳送代幣

　　log.TokenPurchase(buyer,eth_sold,tokens_bought)

　　return tokens_bought

　　

　　private

　　def ethToTokenOutput(tokens_bought:uint256,max_eth:uint256(wei),deadline:timestamp,buyer:address,recipient:address)->uint256(wei):

　　assert deadline>=block.timestamp and(tokens_bought>0 and max_eth>0)

　　token_reserve:uint256=self.token.balanceOf(self)#獲取代幣儲備

　　#用getOutputPrice獲得所需支付的ETH數量

　　#因為交易是先轉賬再執行合約程式碼，所以呼叫該合約時ETH已經轉到兌換合約中，

　　#而入口函式會直接將msg.value作為max_eth傳入，所以ETH儲備量為self.balance-max_eth

　　eth_sold:uint256=self.getOutputPrice(tokens_bought,as_unitless_number(self.balance-max_eth),token_reserve)

　　#Throws if eth_sold>max_eth

　　#計算需要退還給使用者的ETH

　　eth_refund:uint256(wei)=max_eth-as_wei_value(eth_sold,'wei')

　　if eth_refund>0:

　　send(buyer,eth_refund)#如果需要退還的ETH大於0，轉賬。

　　assert self.token.transfer(recipient,tokens_bought)#向使用者傳送代幣

　　log.TokenPurchase(buyer,as_wei_value(eth_sold,'wei'),tokens_bought)

　　return as_wei_value(eth_sold,'wei')