As a highly developed token economy with the characteristics of sustainability,openness,autonomy,and immersion,the metauniverse conforms to the development trend of modern economy.The main development paths of the metauniverse include the"big internet route"and the"blockchain based construction route".In the long run,the"blockchain based construction route"metauniverse can truly achieve the goal of a parallel digital world.However,internet giants are important builders of the metauniverse ecosystem,and the tamperability and interoperability provided by blockchains are crucial.

　　A blockchain is a structure that links data,including data and hash pointers to previous data.Usually,things are interrelated.Each transaction is recorded and published in the blockchain.The attributes we saw earlier ensure the security of intra blockchain transactions.

　　#notice Deposit ETH and Tokens(self.token)at current ratio to mint UNI tokens.

　　#dev min_liquidity does nothing when total UNI supply is 0.

　　#param min_liquidity Minimum number of UNI sender will mint if total UNI supply is greater than 0.用戶能接受的最少流動(dòng)性代幣

　　#param max_tokens Maximum number of tokens deposited.Deposits max amount if total UNI supply is 0.用戶想要提供的代幣數(shù)量最大值。

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

　　#return The amount of UNI minted.所鑄造的流動(dòng)性代幣數(shù)量

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　　#根據(jù)流動(dòng)性池中ETH和代幣的比例等比例添加兩種幣，并獲得等比例份額的流動(dòng)性代幣

　　public

　　payable

　　def addLiquidity(min_liquidity:uint256,max_tokens:uint256,deadline:timestamp)->uint256:

　　開發(fā)功能I59源碼2OO7詳細(xì)3O69

　　assert deadline>block.timestamp and(max_tokens>0 and msg.value>0)

　　total_liquidity:uint256=self.totalSupply#獲得流動(dòng)性代幣總供應(yīng)量

　　if total_liquidity>0:#非該池子第一次添加流動(dòng)性

　　assert min_liquidity>0#添加的流動(dòng)性最小也要大于0

　　eth_reserve:uint256(wei)=self.balance-msg.value#獲得ETH儲(chǔ)備量

　　token_reserve:uint256=self.token.balanceOf(self)#獲得代幣儲(chǔ)備量

　　#根據(jù)投入的ETH數(shù)量計(jì)算需要投入的代幣數(shù)量

　　#最后+1是手動(dòng)向上取整，防止默認(rèn)的向下取整減少流動(dòng)性池應(yīng)收的代幣數(shù)量，進(jìn)而逐漸稀釋份額

　　token_amount:uint256=msg.value*token_reserve/eth_reserve+1

　　#計(jì)算需要鑄造的流動(dòng)性代幣數(shù)量

　　#這里不向上取整是為了保證鑄造的流動(dòng)性代幣價(jià)值<代幣價(jià)值以防止流動(dòng)性代幣價(jià)值的稀釋

　　liquidity_minted:uint256=msg.value*total_liquidity/eth_reserve

　　assert max_tokens>=token_amount and liquidity_minted>=min_liquidity

　　self.balances[msg.sender]+=liquidity_minted#鑄造流動(dòng)性代幣并發(fā)放給提供者

　　self.totalSupply=total_liquidity+liquidity_minted#更新流動(dòng)性代幣總供應(yīng)量

　　assert self.token.transferFrom(msg.sender,self,token_amount)#收取代幣

　　log.AddLiquidity(msg.sender,msg