DAPP区块链公排互助系统开发丨技术分析搭建

 UserStruct memory userStruct;
        currUserID++;
 
        userStruct = UserStruct({
            isExist: true,
            id: currUserID,
            referrerID: 0,
            referral: new address[](0)
        });
        users[ownerWallet] = userStruct;
        userList[currUserID] = ownerWallet;
 
        for(uint i = 1; i <= 10; i++) {
            users[ownerWallet].levelExpired[i] = 55555555555;
        }
    }
 
    function () external payable {
        uint level;
 
        if(msg.value == LEVEL_PRICE[1]) level = 1;
        else if(msg.value == LEVEL_PRICE[2]) level = 2;
        else if(msg.value == LEVEL_PRICE[3]) level = 3;
        else if(msg.value == LEVEL_PRICE[4]) level = 4;
        else if(msg.value == LEVEL_PRICE[5]) level = 5;
        else if(msg.value == LEVEL_PRICE[6]) level = 6;
        else if(msg.value == LEVEL_PRICE[7]) level = 7;
        else if(msg.value == LEVEL_PRICE[8]) level = 8;
        else if(msg.value == LEVEL_PRICE[9]) level = 9;
        else if(msg.value == LEVEL_PRICE[10]) level = 10;
        else revert('Incorrect Value send');
 
        if(users[msg.sender].isExist) buyLevel(level);
        else if(level == 1) {
            uint refId = 0;
            address referrer = bytesToAddress(msg.data);
 
            if(users[referrer].isExist) refId = users[referrer].id;
            else revert('Incorrect referrer');
 
            regUser(refId);
        }
        else revert('Please buy first level for 0.03 ETH');
    }
 
    function regUser(uint _referrerID) public payable {
        require(address(oldSC) == address(0), 'Initialize not finished');
        require(!users[msg.sender].isExist, 'User exist');
        require(_referrerID > 0 && _referrerID <= currUserID, 'Incorrect referrer Id');
        require(msg.value == LEVEL_PRICE[1], 'Incorrect Value');
 
        if(users[userList[_referrerID]].referral.length >= REFERRER_1_LEVEL_LIMIT) _referrerID = users[findFreeReferrer(userList[_referrerID])].id;
 
        UserStruct memory userStruct;
        currUserID++;
 
        userStruct = UserStruct({
            isExist: true,
            id: currUserID,
            referrerID: _referrerID,
            referral: new address[](0)
        });
 
        users[msg.sender] = userStruct;
        userList[currUserID] = msg.sender;
 
        users[msg.sender].levelExpired[1] = now + PERIOD_LENGTH;
 
        users[userList[_referrerID]].referral.push(msg.sender);
 
        payForLevel(1, msg.sender);
 
        emit regLevelEvent(msg.sender, userList[_referrerID], now);
    }
 
    function buyLevel(uint _level) public payable {
        require(users[msg.sender].isExist, 'User not exist'); 
        require(_level > 0 && _level <= 10, 'Incorrect level');
 
        if(_level == 1) {
            require(msg.value == LEVEL_PRICE[1], 'Incorrect Value');
            users[msg.sender].levelExpired[1] += PERIOD_LENGTH;
        }
        else {
            require(msg.value == LEVEL_PRICE[_level], 'Incorrect Value');
 
            for(uint l =_level - 1; l > 0; l--) require(users[msg.sender].levelExpired[l] >= now, 'Buy the previous level');
 
            if(users[msg.sender].levelExpired[_level] == 0) users[msg.sender].levelExpired[_level] = now + PERIOD_LENGTH;
            else users[msg.sender].levelExpired[_level] += PERIOD_LENGTH;
        }
 
        payForLevel(_level, msg.sender);
 
        emit buyLevelEvent(msg.sender, _level, now);
    }
    
    function syncWithOldSC(uint limit) public {
        require(address(oldSC) != address(0), 'Initialize closed');
        require(msg.sender == ownerWallet, 'Access denied');
 
        for(uint i = 0; i < limit; i++) {
            address user = oldSC.userList(oldSCUserId);
            (bool isExist,, uint referrerID) = oldSC.users(user);
 
            if(isExist) {
                oldSCUserId++;
                
                address ref = oldSC.userList(referrerID);
 
                if(!users[user].isExist && users[ref].isExist) {
                    users[user].isExist = true;
                    users[user].id = ++currUserID;
                    users[user].referrerID = users[ref].id;