update list of voters

contracts/validator/contract/TomoValidator.sol

@@ -8,6 +8,8 @@ contract TomoValidator is IValidator {
 
     event Vote(address _candidate, uint256 _cap);
     event Unvote(address _candidate, uint256 _cap);
+    event Propose(address _candidate, uint256 _cap);
+    event Retire(address _candidate, uint256 _cap);
 
     struct ValidatorState {
         bool isCandidate;
@@ -16,6 +18,7 @@ contract TomoValidator is IValidator {
     }
 
     mapping(address => ValidatorState) validatorsState;
+    mapping(address => address[]) voters;
     address[] public candidates;
     uint256 candidateCount = 0;
     uint256 public constant minCandidateCap = 10000 ether;
@@ -45,13 +48,16 @@ contract TomoValidator is IValidator {
             isCandidate: true,
             cap: msg.value
         });
+        validatorsState[msg.sender].voters[msg.sender] = msg.value;
         candidateCount = candidateCount + 1;
+        emit Propose(msg.sender, msg.value);
     }
 
     function vote(address _candidate) external payable {
         require(validatorsState[_candidate].isCandidate);
         validatorsState[_candidate].cap = validatorsState[_candidate].cap.add(msg.value);
         validatorsState[_candidate].voters[msg.sender] = validatorsState[_candidate].voters[msg.sender].add(msg.value);
+        voters[_candidate].push(msg.sender);
         emit Vote(_candidate, msg.value);
     }
 
@@ -67,12 +73,15 @@ contract TomoValidator is IValidator {
         return validatorsState[_candidate].voters[_voter];
     }
 
+    function getVoters(address _candidate) public view returns(address[]) {
+        return voters[_candidate];
+    }
+
     function isCandidate(address _candidate) public view returns(bool) {
        return validatorsState[_candidate].isCandidate;
     }
 
     function unvote(address _candidate, uint256 _cap) public {
-        require(validatorsState[_candidate].isCandidate);
         require(validatorsState[_candidate].voters[msg.sender] >= _cap);
         validatorsState[_candidate].cap = validatorsState[_candidate].cap.sub(_cap);
         validatorsState[_candidate].voters[msg.sender] = validatorsState[_candidate].voters[msg.sender].sub(_cap);
@@ -80,4 +89,23 @@ contract TomoValidator is IValidator {
         msg.sender.transfer(_cap);
         emit Unvote(_candidate, _cap);
     }
+
+    function retire() public {
+        require(validatorsState[msg.sender].isCandidate);
+        uint256 cap = validatorsState[msg.sender].voters[msg.sender];
+        validatorsState[msg.sender].cap = validatorsState[msg.sender].cap.sub(cap);
+        validatorsState[msg.sender].voters[msg.sender] = 0;
+        validatorsState[msg.sender].isCandidate = false;
+        candidateCount = candidateCount - 1;
+        for (uint256 i = 0; i < candidates.length; i++) {
+            if (candidates[i] == msg.sender) {
+                delete candidates[i];
+                break;
+            }
+        }
+        // refunding to user after retiring
+        msg.sender.transfer(cap);
+        emit Retire(msg.sender, cap);
+    }
+
 }