registry contract

Co-authored-by: Roman Semenov <semenov.roma@gmail.com>

contracts/RelayerRegistry.sol

@@ -1,48 +1,101 @@
 //SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
-import "hardhat/console.sol";
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
 import "@openzeppelin/contracts/math/SafeMath.sol";
 
+interface IENS {
+  function owner(bytes32 node) external view returns (address);
+}
+
 contract RelayerRegistry is Ownable {
   using SafeMath for uint256;
 
-  IERC20 public immutable TORN;
+  IERC20 public constant TORN = IERC20(0x77777FeDdddFfC19Ff86DB637967013e6C6A116C);
+  IENS public constant ENS = IENS(0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e);
+  address public immutable withdrawalProxy;
+
   mapping(address => Relayer) public relayers;
   uint256 public txFee;
+  uint256 public minStake;
+  uint256 public totalTornBurned;
+
+  event Register(bytes32 ensHash, address relayer);
+  event Stake(address indexed relayer, uint256 stake);
+  event Kick(address indexed relayer, bool confiscation);
+  event NewMinStake(uint256 stake);
+  event NewTxFee(uint256 fee);
+  event Transaction(address indexed _relayer, uint _fee);
+
+
+  modifier onlyWithdrawalProxy {
+    require(msg.sender == withdrawalProxy, "only withdrawal proxy");
+    _;
+  }
 
   struct Relayer {
     uint256 balance;
+    bytes32 ensHash;
+    mapping(address => bool) addresses;
   }
 
-  constructor(IERC20 _torn) {
-    TORN = _torn;
-  }
-
-  function stake(uint256 _amount) public {
-    TORN.transferFrom(msg.sender, address(this), _amount);
-    Relayer memory relayer = relayers[msg.sender];
-    relayer.balance = relayer.balance.add(_amount);
-  }
-
-  function transaction() public {
-    Relayer storage relayer = relayers[msg.sender];
-    relayer.balance = relayer.balance.sub(txFee);
-  }
-
-  function setTxFee(uint256 _txFee) public onlyOwner {
+  constructor (address _withdrawalProxy, uint256 _txFee, uint256 _minStake) {
+    withdrawalProxy = _withdrawalProxy;
     txFee = _txFee;
+    minStake = _minStake;
   }
 
-  function kick(address _relayer, bool confiscateStake) public onlyOwner {
+  function register(uint _stake, bytes32 _ensHash) external {
+    require(msg.sender == ENS.owner(_ensHash), "only owner of the ENS name");
+    Relayer storage relayer = relayers[msg.sender];
+    require(relayer.ensHash == bytes32(0) && _stake >= minStake);
+
+    _updateStake(_stake, relayer);
+
+    relayer.addresses[msg.sender] = true;
+    relayer.ensHash = _ensHash;
+    emit Register(_ensHash, msg.sender);
+  }
+
+  function stake(uint _stake) external {
+    Relayer storage relayer = relayers[msg.sender];
+    require(relayer.ensHash != bytes32(0), "Only registered relayers can top up balance");
+    _updateStake(_stake, relayer);
+  }
+
+
+  function transaction(address _sender, address _feeReceiver) onlyWithdrawalProxy external {
+    Relayer storage relayer = relayers[_feeReceiver];
+    if(relayer.ensHash != bytes32(0)) {
+      require(relayer.addresses[_sender], "only registered relayer can send");
+      uint256 fee = relayer.balance > txFee ? txFee : relayer.balance;
+      relayer.balance -= fee;
+      totalTornBurned += fee;
+      emit Transaction(_feeReceiver, fee);
+    }
+  }
+
+  function setTxFee(uint256 _txFee) external onlyOwner {
+    txFee = _txFee;
+    emit NewTxFee(_txFee);
+  }
+
+  function setMinStake(uint256 _stake) external onlyOwner {
+    minStake = _stake;
+    emit NewMinStake(_stake);
+  }
+
+  function kick(address _relayer, bool confiscateStake) external onlyOwner {
     Relayer storage relayer = relayers[_relayer];
-    if (confiscateStake) {
-      TORN.transfer(msg.sender, relayer.balance);
-    } else {
-      TORN.transfer(_relayer, relayer.balance);
-    }
+    TORN.transfer(confiscateStake ? msg.sender : _relayer, relayer.balance);
     relayer.balance = 0;
+    emit Kick(_relayer, confiscateStake);
+  }
+
+  function _updateStake(uint _stake, Relayer storage relayer) private {
+    TORN.transferFrom(msg.sender, address(this), _stake);
+    relayer.balance = relayer.balance.add(_stake);
+    emit Stake(msg.sender, _stake);
   }
 }