魔豹联盟佛萨奇2.0矩阵公排开发详细丨魔豹联盟佛萨奇2.0矩阵公排系统开发方案及逻辑

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　　tokenToEthInput通过token.balanceOf获得代币兑换合约当前的代币ERC20代币存储量，然后用getInputPrice获得可兑换到的ETH的数量，接着用as_wei_value将单位转换成wei后用send函数将eth发送给接收者，最后再调用transferForm从buyer手中收取应当支付的代币。

　　#dev Pricing function for converting between ETH and Tokens.

　　#param input_amount Amount of ETH or Tokens being sold.

　　#param input_reserve Amount of ETH or Tokens(input type)in exchange reserves.

　　#param output_reserve Amount of ETH or Tokens(output type)in exchange reserves.

　　#return Amount of ETH or Tokens bought.关于区块链项目技术开发唯:MrsFu123，代币发行、dapp智能合约开发、链游开发、多链钱包开发

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　　private

　　constant

　　def getInputPrice(input_amount:uint256,input_reserve:uint256,output_reserve:uint256)->uint256:案例及设计I35详细7O98开发O7I8

　　assert input_reserve>0 and output_reserve>0#需要两币的储备都大于0

　　input_amount_with_fee:uint256=input_amount*997#抽取千分之3手续费

　　numerator:uint256=input_amount_with_fee*output_reserve

　　denominator:uint256=(input_reserve*1000)+input_amount_with_fee

　　return numerator/denominator

　　private

　　def tokenToEthOutput(eth_bought:uint256(wei),max_tokens:uint256,deadline:timestamp,buyer:address,recipient:address)->uint256:

　　assert deadline>=block.timestamp and eth_bought>0

　　token_reserve:uint256=self.token.balanceOf(self)#获取代币储备量

　　#通过getOutputPrice计算所需要花费的代币数量

　　tokens_sold:uint256=self.getOutputPrice(as_unitless_number(eth_bought),token_reserve,as_unitless_number(self.balance))

　　#tokens sold is always>0

　　assert max_tokens>=tokens_sold

　　send(recipient,eth_bought)#向接收者发送所兑换得到的ETH

　　assert self.token.transferFrom(buyer,self,tokens_sold)#从购买者收取代币

　　log.EthPurchase(buyer,tokens_sold,eth_bought)

　　return tokens_sold