87 lines
2.4 KiB
Solidity
87 lines
2.4 KiB
Solidity
// Author: Mohamed Sohail <mohamedsohailazim@gmail.com>
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// SPDX-License-Identifier: GPL-3.0-or-later
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pragma solidity >= 0.6.12;
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contract KitabuValidators {
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address constant SYSTEM_ADDRESS = 0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE;
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address public admissionController = 0x9F57B4A25638F3bdfFcB1F3d2902860601a1Aa65;
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address[] bootstrapValidators = [
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0x7c5a36Cb43fC87fbB1de46eb6Cfd231c2ADe147b
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];
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address[] validators;
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bool public finalized;
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mapping(address => uint256) validatorSetIndex;
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event NewAdmissionController(address indexed old, address indexed newController);
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event InitiateChange(bytes32 indexed parentHash, address[] newSet);
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event ChangeFinalized(address[] currentSet);
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modifier onlySystemChange {
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require(msg.sender == SYSTEM_ADDRESS);
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_;
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}
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modifier alreadyFinalized {
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require(finalized);
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_;
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}
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modifier onlyAdmissionController {
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require(msg.sender == admissionController);
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_;
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}
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constructor() public {
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for (uint i = 0; i < bootstrapValidators.length; i++) {
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validators.push(bootstrapValidators[i]);
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validatorSetIndex[bootstrapValidators[i]] = i;
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}
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finalized = true;
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}
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function setNewAdmissionController(address newController) public onlyAdmissionController {
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emit NewAdmissionController(admissionController, newController);
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admissionController = newController;
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}
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function getValidators() public view returns(address[] memory) {
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return validators;
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}
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function initiateChange() private {
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finalized = false;
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emit InitiateChange(blockhash(block.number - 1), getValidators());
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}
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function finalizeChange() public {
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finalized = true;
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emit ChangeFinalized(validators);
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}
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function addValidator(address newValidator) public onlyAdmissionController alreadyFinalized{
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validators.push(newValidator);
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validatorSetIndex[newValidator] = validators.length - 1;
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initiateChange();
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}
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function removeValidator(address exValidator) public onlyAdmissionController alreadyFinalized{
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orderedRemoval(validatorSetIndex[exValidator]);
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delete validatorSetIndex[exValidator];
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initiateChange();
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}
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function orderedRemoval(uint index) private {
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for(uint i = index; i < validators.length-1; i++){
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validators[i] = validators[i+1];
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}
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validators.pop();
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}
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}
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