🖥️ Decentral bank Study project

DApp 접속 시 Web3 환경 체크와 메타마스크를 통한 연동

    // Web3 연결
    async loadWeb3() {
        if(window.ethereum) {
            window.web3 = new Web3(window.ethereum);
            await window.ethereum.enable();
        }
        else if(window.web3) {
                window.web3 = new Web3(window.web3.currentProvider);
        } 
        else {
            window.alert('No ethereum browser detected! Check out MetaMask!');
        }
    }

탈중앙화 은행 Main

• 예금 및 출금 기능을 위한 버튼 / 오른쪽 상단의 현재 연결된 MetaMask 계정주소 / 예금 금액에 따른 Reward Tokens 보상

[기능 1] Token 예금 하기

// staking function
function depositTokens(uint256 _amount) public {
    // require staking amount to be greater than zero
    require(_amount > 0, 'amount cannot be 0');

    // 스테이킹할 tether tokens
    tether.transferFrom(msg.sender, address(this), _amount);

    // Update staking Balance
    stakingBalance[msg.sender] += _amount;

    if(!hasStaked[msg.sender]) {
        stakers.push(msg.sender);
    }

    // Update staking Balance
    isStaking[msg.sender] = true;
    hasStaked[msg.sender] = true;
}

    // Tokens 예금 함수
    stakeTokens = (amount) => {
        this.setState({loading: true});
        this.state.tether.methods.approve(this.state.decentralBank._address, amount).send({from: this.state.account}).on('transactionHash', (hash) => {
        this.state.decentralBank.methods.depositTokens(amount).send({from: this.state.account}).on('transactionHash', (hash) => {
            this.setState({loading: false})
        });
    });
    }

[기능 2] 예금한 Token 인출 하기

// unstake tokens
function unstakeTokens() public {
    uint balance = stakingBalance[msg.sender];
    require(balance > 0, 'staking balance cannot be less than zero');

    // 은행 주소에서 고객 주소로 언스테이킹
    tether.transfer(msg.sender, balance);

    // reset staking balance
    stakingBalance[msg.sender] = 0;

    // Update staking status
    isStaking[msg.sender] = false;
}

 // Tokens 출금 함수
    unstakeTokens = () => {
        this.setState({loading: true});
        this.state.decentralBank.methods.unstakeTokens().send({from: this.state.account}).on('transactionHash', (hash) => {
            this.setState({loading: false})
        });
    }

[기능 3] 예금액에 따른 RewardTokens 발행

// issue rewards
function issueTokens() public {
    // require the owner to issue tokens only
    //require(msg.sender == owner, 'caller must be owner');

    for(uint i=0; i<stakers.length; i++) {
        address recipient = stakers[i];
        uint balance = stakingBalance[recipient] / 10; // devide 10 to create percentage incentive
        
        if(balance > 0){
            rwd.transfer(recipient, balance);
        }
    }
}

// Tokens Rewards 함수
    issueTokens = () => {
        this.setState({loading: true})
        this.state.decentralBank.methods.issueTokens().send({from: this.state.account}).on('transactionHash', (hash) => {
            this.setState({loading: false})
        });
    }