Stromanbieter Beispiel

stromanbieter.sol

pragma solidity ^0.4.15;
contract  City {
    
        address public owner;  // owner of the contract
        
        struct User {  // User structure
           uint id;
           address taker;
           string name;
           uint monatskosten;
           string anbieter;
           string status;
       }
       
        uint totalLoan=0;  // count of total loans
        
        mapping(address => User) users; // mapping address to loan
        
        // constructor executed when deploying the contract into network
        // `msg.sender` is the account creating this contract.
        constructor() public payable {
            owner = msg.sender; 
        }
        
        // transaction to request Loan
        function requestLoan(string username, uint monatskosten, string anbieter) public { 
            users[msg.sender] = User(totalLoan, msg.sender, username, monatskosten, anbieter, "Requested"); // add Loan object to mapping
            totalLoan++;
        }
        
        // get loan details
        function getLoan(address addr) public constant returns(uint, string, uint, string, string) {
            User memory u = users[addr];
            return (u.id, u.name, u.monatskosten, u.anbieter, u.status);
        }
        
        // transaction to approve Loan based on key address 
        function approveLoan(address addr) public {
            require(msg.sender == owner);
            User storage user = users[addr];
            user.status="Accepted";
            //users[addr].status="Accepted";
            addr.transfer(users[addr].monatskosten);
        }
    
        // reject 
        function rejectLoan(address addr) public {
            require(msg.sender == owner);
            User storage user = users[addr];
            user.status="Rejected";
        }
        
        // get Balance
        function getBalance() public constant returns(uint){
            return address(this).balance;
        }
}