/
OwnedSet.sol
138 lines (113 loc) · 3.94 KB
/
OwnedSet.sol
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//! Copyright 2017 Peter Czaban, Parity Technologies Ltd.
//!
//! Licensed under the Apache License, Version 2.0 (the "License");
//! you may not use this file except in compliance with the License.
//! You may obtain a copy of the License at
//!
//! http://www.apache.org/licenses/LICENSE-2.0
//!
//! Unless required by applicable law or agreed to in writing, software
//! distributed under the License is distributed on an "AS IS" BASIS,
//! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//! See the License for the specific language governing permissions and
//! limitations under the License.
pragma solidity ^0.4.23;
import "./interfaces/Owned.sol";
import "./interfaces/ValidatorSet.sol";
// Owner can add or remove validators.
contract OwnedSet is Owned, ValidatorSet {
// EVENTS
event Report(address indexed reporter, address indexed reported, bool indexed malicious);
event ChangeFinalized(address[] current_set);
// System address, used by the block sealer.
address constant SYSTEM_ADDRESS = 0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE;
uint public recentBlocks = 20;
modifier only_system_and_not_finalized() {
require(msg.sender != SYSTEM_ADDRESS || finalized);
_;
}
modifier when_finalized() {
require(!finalized);
_;
}
modifier is_validator(address _someone) {
if (pendingStatus[_someone].isIn) { _; }
}
modifier is_pending(address _someone) {
require(pendingStatus[_someone].isIn);
_;
}
modifier is_not_pending(address _someone) {
require(!pendingStatus[_someone].isIn);
_;
}
modifier is_recent(uint _blockNumber) {
require(block.number <= _blockNumber + recentBlocks);
_;
}
struct AddressStatus {
bool isIn;
uint index;
}
// Current list of addresses entitled to participate in the consensus.
address[] validators;
address[] pending;
mapping(address => AddressStatus) pendingStatus;
// Was the last validator change finalized. Implies validators == pending
bool public finalized;
constructor(address[] _initial) public {
pending = _initial;
for (uint i = 0; i < _initial.length - 1; i++) {
pendingStatus[_initial[i]].isIn = true;
pendingStatus[_initial[i]].index = i;
}
validators = pending;
}
// Called to determine the current set of validators.
function getValidators() constant public returns (address[]) {
return validators;
}
function getPending() constant public returns (address[]) {
return pending;
}
// Log desire to change the current list.
function initiateChange() private when_finalized {
finalized = false;
emit InitiateChange(blockhash(block.number - 1), getPending());
}
function finalizeChange() public only_system_and_not_finalized {
validators = pending;
finalized = true;
emit ChangeFinalized(getValidators());
}
// OWNER FUNCTIONS
// Add a validator.
function addValidator(address _validator) public only_owner is_not_pending(_validator) {
pendingStatus[_validator].isIn = true;
pendingStatus[_validator].index = pending.length;
pending.push(_validator);
initiateChange();
}
// Remove a validator.
function removeValidator(address _validator) public only_owner is_pending(_validator) {
pending[pendingStatus[_validator].index] = pending[pending.length - 1];
delete pending[pending.length - 1];
pending.length--;
// Reset address status.
delete pendingStatus[_validator].index;
pendingStatus[_validator].isIn = false;
initiateChange();
}
function setRecentBlocks(uint _recentBlocks) public only_owner {
recentBlocks = _recentBlocks;
}
// MISBEHAVIOUR HANDLING
// Called when a validator should be removed.
function reportMalicious(address _validator, uint _blockNumber, bytes) public only_owner is_recent(_blockNumber) {
emit Report(msg.sender, _validator, true);
}
// Report that a validator has misbehaved in a benign way.
function reportBenign(address _validator, uint _blockNumber) public only_owner is_validator(_validator) is_recent(_blockNumber) {
emit Report(msg.sender, _validator, false);
}
}