Address Contract Partially Verified
Address
0x6E7BfAEBd173dC08466B21e61FBc09106eAe7795
Balance
0 ETH
Nonce
2
Code Size
15134 bytes
Creator
0x54eAde20...039e at tx 0x5b472cc9...3c5c30
Indexed Transactions
0
Contract Bytecode
15134 bytes
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Verified Source Code Partial Match
Compiler: v0.8.21+commit.d9974bed
EVM: shanghai
Optimization: Yes (200 runs)
LockstakeEngine.sol 426 lines
// SPDX-FileCopyrightText: © 2023 Dai Foundation <www.daifoundation.org>
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
pragma solidity ^0.8.21;
import { LockstakeUrn } from "src/LockstakeUrn.sol";
import { Multicall } from "src/Multicall.sol";
interface VoteDelegateFactoryLike {
function created(address) external returns (uint256);
}
interface VoteDelegateLike {
function lock(uint256) external;
function free(uint256) external;
}
interface VatLike {
function ilks(bytes32) external view returns (uint256, uint256, uint256, uint256, uint256);
function urns(bytes32, address) external view returns (uint256, uint256);
function hope(address) external;
function slip(bytes32, address, int256) external;
function frob(bytes32, address, address, address, int256, int256) external;
function grab(bytes32, address, address, address, int256, int256) external;
}
interface UsdsJoinLike {
function vat() external view returns (VatLike);
function usds() external view returns (GemLike);
function join(address, uint256) external;
function exit(address, uint256) external;
}
interface GemLike {
function approve(address, uint256) external;
function transfer(address, uint256) external;
function transferFrom(address, address, uint256) external;
function mint(address, uint256) external;
function burn(address, uint256) external;
}
interface JugLike {
function drip(bytes32) external returns (uint256);
}
contract LockstakeEngine is Multicall {
// --- storage variables ---
mapping(address usr => uint256 allowed) public wards;
mapping(address farm => FarmStatus) public farms;
mapping(address owner => uint256 count) public ownerUrnsCount;
mapping(address owner => mapping(uint256 index => address urn)) public ownerUrns;
mapping(address urn => address owner) public urnOwners;
mapping(address urn => mapping(address usr => uint256 allowed)) public urnCan;
mapping(address urn => address voteDelegate) public urnVoteDelegates;
mapping(address urn => address farm) public urnFarms;
mapping(address urn => uint256 auctionsCount) public urnAuctions;
JugLike public jug;
// --- constants and enums ---
uint256 constant WAD = 10**18;
uint256 constant RAY = 10**27;
enum FarmStatus { UNSUPPORTED, ACTIVE, DELETED }
// --- immutables ---
VoteDelegateFactoryLike immutable public voteDelegateFactory;
VatLike immutable public vat;
UsdsJoinLike immutable public usdsJoin;
GemLike immutable public usds;
bytes32 immutable public ilk;
GemLike immutable public sky;
GemLike immutable public lssky;
address immutable public urnImplementation;
uint256 immutable public fee;
// --- events ---
event Rely(address indexed usr);
event Deny(address indexed usr);
event File(bytes32 indexed what, address data);
event AddFarm(address farm);
event DelFarm(address farm);
event Open(address indexed owner, uint256 indexed index, address urn);
event Hope(address indexed owner, uint256 indexed index, address indexed usr);
event Nope(address indexed owner, uint256 indexed index, address indexed usr);
event SelectVoteDelegate(address indexed owner, uint256 indexed index, address indexed voteDelegate);
event SelectFarm(address indexed owner, uint256 indexed index, address indexed farm, uint16 ref);
event Lock(address indexed owner, uint256 indexed index, uint256 wad, uint16 ref);
event Free(address indexed owner, uint256 indexed index, address to, uint256 wad, uint256 freed);
event FreeNoFee(address indexed owner, uint256 indexed index, address to, uint256 wad);
event Draw(address indexed owner, uint256 indexed index, address to, uint256 wad);
event Wipe(address indexed owner, uint256 indexed index, uint256 wad);
event GetReward(address indexed owner, uint256 indexed index, address indexed farm, address to, uint256 amt);
event OnKick(address indexed urn, uint256 wad);
event OnTake(address indexed urn, address indexed who, uint256 wad);
event OnRemove(address indexed urn, uint256 sold, uint256 burn, uint256 refund);
// --- modifiers ---
modifier auth {
require(wards[msg.sender] == 1, "LockstakeEngine/not-authorized");
_;
}
// --- constructor ---
constructor(address voteDelegateFactory_, address usdsJoin_, bytes32 ilk_, address sky_, address lssky_, uint256 fee_) {
require(fee_ < WAD, "LockstakeEngine/fee-equal-or-greater-wad");
voteDelegateFactory = VoteDelegateFactoryLike(voteDelegateFactory_);
usdsJoin = UsdsJoinLike(usdsJoin_);
vat = usdsJoin.vat();
usds = usdsJoin.usds();
ilk = ilk_;
sky = GemLike(sky_);
lssky = GemLike(lssky_);
fee = fee_;
urnImplementation = address(new LockstakeUrn(address(vat), lssky_));
vat.hope(usdsJoin_);
usds.approve(usdsJoin_, type(uint256).max);
wards[msg.sender] = 1;
emit Rely(msg.sender);
}
// --- internals ---
function _min(uint256 x, uint256 y) internal pure returns (uint256 z) {
z = x <= y ? x : y;
}
function _divup(uint256 x, uint256 y) internal pure returns (uint256 z) {
// Note: _divup(0,0) will return 0 differing from natural solidity division
unchecked {
z = x != 0 ? ((x - 1) / y) + 1 : 0;
}
}
function _urnAuth(address owner, address urn, address usr) internal view returns (bool ok) {
ok = owner == usr || urnCan[urn][usr] == 1;
}
function _getUrn(address owner, uint256 index) internal view returns (address urn) {
urn = ownerUrns[owner][index];
require(urn != address(0), "LockstakeEngine/invalid-urn");
}
function _getAuthedUrn(address owner, uint256 index) internal view returns (address urn) {
urn = _getUrn(owner, index);
require(_urnAuth(owner, urn, msg.sender), "LockstakeEngine/urn-not-authorized");
}
// See the reference implementation in https://eips.ethereum.org/EIPS/eip-1167
function _initCode() internal view returns (bytes memory code) {
code = new bytes(0x37);
bytes20 impl = bytes20(urnImplementation);
assembly {
mstore(add(code, 0x20), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
mstore(add(code, add(0x20, 0x14)), impl)
mstore(add(code, add(0x20, 0x28)), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
}
}
// --- administration ---
function rely(address usr) external auth {
wards[usr] = 1;
emit Rely(usr);
}
function deny(address usr) external auth {
wards[usr] = 0;
emit Deny(usr);
}
function file(bytes32 what, address data) external auth {
if (what == "jug") {
jug = JugLike(data);
} else revert("LockstakeEngine/file-unrecognized-param");
emit File(what, data);
}
function addFarm(address farm) external auth {
farms[farm] = FarmStatus.ACTIVE;
emit AddFarm(farm);
}
function delFarm(address farm) external auth {
farms[farm] = FarmStatus.DELETED;
emit DelFarm(farm);
}
// --- getters ---
function isUrnAuth(address owner, uint256 index, address usr) external view returns (bool ok) {
ok = _urnAuth(owner, _getUrn(owner, index), usr);
}
// --- urn management functions ---
function open(uint256 index) external returns (address urn) {
require(index == ownerUrnsCount[msg.sender]++, "LockstakeEngine/wrong-urn-index");
bytes memory initCode = _initCode();
assembly { urn := create(0, add(initCode, 0x20), 0x37) }
LockstakeUrn(urn).init(); // would revert if create had failed
ownerUrns[msg.sender][index] = urn;
urnOwners[urn] = msg.sender;
emit Open(msg.sender, index, urn);
}
function hope(address owner, uint256 index, address usr) external {
address urn = _getAuthedUrn(owner, index);
urnCan[urn][usr] = 1;
emit Hope(owner, index, usr);
}
function nope(address owner, uint256 index, address usr) external {
address urn = _getAuthedUrn(owner, index);
urnCan[urn][usr] = 0;
emit Nope(owner, index, usr);
}
// --- delegation/staking functions ---
function selectVoteDelegate(address owner, uint256 index, address voteDelegate) external {
address urn = _getAuthedUrn(owner, index);
require(urnAuctions[urn] == 0, "LockstakeEngine/urn-in-auction");
require(voteDelegate == address(0) || voteDelegateFactory.created(voteDelegate) == 1, "LockstakeEngine/not-valid-vote-delegate");
address prevVoteDelegate = urnVoteDelegates[urn];
require(prevVoteDelegate != voteDelegate, "LockstakeEngine/same-vote-delegate");
(uint256 ink, uint256 art) = vat.urns(ilk, urn);
if (art > 0 && voteDelegate != address(0)) {
(,, uint256 spot,,) = vat.ilks(ilk);
require(ink * spot >= art * jug.drip(ilk), "LockstakeEngine/urn-unsafe");
}
_selectVoteDelegate(urn, ink, prevVoteDelegate, voteDelegate);
emit SelectVoteDelegate(owner, index, voteDelegate);
}
function _selectVoteDelegate(address urn, uint256 wad, address prevVoteDelegate, address voteDelegate) internal {
if (wad > 0) {
if (prevVoteDelegate != address(0)) {
VoteDelegateLike(prevVoteDelegate).free(wad);
}
if (voteDelegate != address(0)) {
sky.approve(voteDelegate, wad);
VoteDelegateLike(voteDelegate).lock(wad);
}
}
urnVoteDelegates[urn] = voteDelegate;
}
function selectFarm(address owner, uint256 index, address farm, uint16 ref) external {
address urn = _getAuthedUrn(owner, index);
require(urnAuctions[urn] == 0, "LockstakeEngine/urn-in-auction");
require(farm == address(0) || farms[farm] == FarmStatus.ACTIVE, "LockstakeEngine/farm-unsupported-or-deleted");
address prevFarm = urnFarms[urn];
require(prevFarm != farm, "LockstakeEngine/same-farm");
(uint256 ink,) = vat.urns(ilk, urn);
_selectFarm(urn, ink, prevFarm, farm, ref);
emit SelectFarm(owner, index, farm, ref);
}
function _selectFarm(address urn, uint256 wad, address prevFarm, address farm, uint16 ref) internal {
if (wad > 0) {
if (prevFarm != address(0)) {
LockstakeUrn(urn).withdraw(prevFarm, wad);
}
if (farm != address(0)) {
LockstakeUrn(urn).stake(farm, wad, ref);
}
}
urnFarms[urn] = farm;
}
function lock(address owner, uint256 index, uint256 wad, uint16 ref) external {
address urn = _getUrn(owner, index);
sky.transferFrom(msg.sender, address(this), wad);
require(wad <= uint256(type(int256).max), "LockstakeEngine/overflow");
address voteDelegate = urnVoteDelegates[urn];
if (voteDelegate != address(0)) {
sky.approve(voteDelegate, wad);
VoteDelegateLike(voteDelegate).lock(wad);
}
vat.slip(ilk, urn, int256(wad));
vat.frob(ilk, urn, urn, address(0), int256(wad), 0);
lssky.mint(urn, wad);
address urnFarm = urnFarms[urn];
if (urnFarm != address(0)) {
require(farms[urnFarm] == FarmStatus.ACTIVE, "LockstakeEngine/farm-deleted");
LockstakeUrn(urn).stake(urnFarm, wad, ref);
}
emit Lock(owner, index, wad, ref);
}
function free(address owner, uint256 index, address to, uint256 wad) external returns (uint256 freed) {
address urn = _getAuthedUrn(owner, index);
freed = _free(urn, wad, fee);
sky.transfer(to, freed);
emit Free(owner, index, to, wad, freed);
}
function freeNoFee(address owner, uint256 index, address to, uint256 wad) external auth {
address urn = _getAuthedUrn(owner, index);
_free(urn, wad, 0);
sky.transfer(to, wad);
emit FreeNoFee(owner, index, to, wad);
}
function _free(address urn, uint256 wad, uint256 fee_) internal returns (uint256 freed) {
require(wad <= uint256(type(int256).max), "LockstakeEngine/overflow");
address urnFarm = urnFarms[urn];
if (urnFarm != address(0)) {
LockstakeUrn(urn).withdraw(urnFarm, wad);
}
lssky.burn(urn, wad);
vat.frob(ilk, urn, urn, address(0), -int256(wad), 0);
vat.slip(ilk, urn, -int256(wad));
address voteDelegate = urnVoteDelegates[urn];
if (voteDelegate != address(0)) {
VoteDelegateLike(voteDelegate).free(wad);
}
uint256 burn = wad * fee_ / WAD;
if (burn > 0) {
sky.burn(address(this), burn);
}
unchecked { freed = wad - burn; } // burn <= wad always
}
// --- loan functions ---
function draw(address owner, uint256 index, address to, uint256 wad) external {
address urn = _getAuthedUrn(owner, index);
uint256 rate = jug.drip(ilk);
uint256 dart = _divup(wad * RAY, rate);
require(dart <= uint256(type(int256).max), "LockstakeEngine/overflow");
vat.frob(ilk, urn, address(0), address(this), 0, int256(dart));
usdsJoin.exit(to, wad);
emit Draw(owner, index, to, wad);
}
function wipe(address owner, uint256 index, uint256 wad) external {
address urn = _getUrn(owner, index);
usds.transferFrom(msg.sender, address(this), wad);
usdsJoin.join(address(this), wad);
(, uint256 rate,,,) = vat.ilks(ilk);
uint256 dart = wad * RAY / rate;
require(dart <= uint256(type(int256).max), "LockstakeEngine/overflow");
vat.frob(ilk, urn, address(0), address(this), 0, -int256(dart));
emit Wipe(owner, index, wad);
}
function wipeAll(address owner, uint256 index) external returns (uint256 wad) {
address urn = _getUrn(owner, index);
(, uint256 art) = vat.urns(ilk, urn);
require(art <= uint256(type(int256).max), "LockstakeEngine/overflow");
(, uint256 rate,,,) = vat.ilks(ilk);
wad = _divup(art * rate, RAY);
usds.transferFrom(msg.sender, address(this), wad);
usdsJoin.join(address(this), wad);
vat.frob(ilk, urn, address(0), address(this), 0, -int256(art));
emit Wipe(owner, index, wad);
}
// --- staking rewards function ---
function getReward(address owner, uint256 index, address farm, address to) external returns (uint256 amt) {
address urn = _getAuthedUrn(owner, index);
require(farms[farm] > FarmStatus.UNSUPPORTED, "LockstakeEngine/farm-unsupported");
amt = LockstakeUrn(urn).getReward(farm, to);
emit GetReward(owner, index, farm, to, amt);
}
// --- liquidation callback functions ---
function onKick(address urn, uint256 wad) external auth {
// Urn confiscation happens in Dog contract where ilk vat.gem is sent to the LockstakeClipper
(uint256 ink,) = vat.urns(ilk, urn);
uint256 inkBeforeKick = ink + wad;
_selectVoteDelegate(urn, inkBeforeKick, urnVoteDelegates[urn], address(0));
_selectFarm(urn, inkBeforeKick, urnFarms[urn], address(0), 0);
lssky.burn(urn, wad);
urnAuctions[urn]++;
emit OnKick(urn, wad);
}
function onTake(address urn, address who, uint256 wad) external auth {
sky.transfer(who, wad); // Free SKY to the auction buyer
emit OnTake(urn, who, wad);
}
function onRemove(address urn, uint256 sold, uint256 left) external auth {
uint256 burn;
uint256 refund;
if (left > 0) {
uint256 fee_ = fee;
burn = _min(sold * fee_ / (WAD - fee_), left);
sky.burn(address(this), burn);
unchecked { refund = left - burn; }
if (refund > 0) {
// The following is ensured by the dog and clip but we still prefer to be explicit
require(refund <= uint256(type(int256).max), "LockstakeEngine/overflow");
vat.slip(ilk, urn, int256(refund));
vat.grab(ilk, urn, urn, address(0), int256(refund), 0);
lssky.mint(urn, refund);
}
}
urnAuctions[urn]--;
emit OnRemove(urn, sold, burn, refund);
}
}
LockstakeUrn.sol 80 lines
// SPDX-FileCopyrightText: © 2023 Dai Foundation <www.daifoundation.org>
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
pragma solidity ^0.8.21;
interface VatLike {
function hope(address) external;
}
interface GemLike {
function balanceOf(address) external view returns (uint256);
function approve(address, uint256) external;
function transfer(address, uint256) external;
}
interface StakingRewardsLike {
function rewardsToken() external view returns (GemLike);
function stake(uint256, uint16) external;
function withdraw(uint256) external;
function getReward() external;
}
contract LockstakeUrn {
// --- immutables ---
address immutable public engine;
GemLike immutable public lssky;
VatLike immutable public vat;
// --- modifiers ---
modifier isEngine {
require(msg.sender == engine, "LockstakeUrn/not-engine");
_;
}
// --- constructor & init ---
constructor(address vat_, address lssky_) {
engine = msg.sender;
vat = VatLike(vat_);
lssky = GemLike(lssky_);
}
function init() external isEngine {
vat.hope(msg.sender);
lssky.approve(msg.sender, type(uint256).max);
}
// --- staking functions ---
function stake(address farm, uint256 wad, uint16 ref) external isEngine {
lssky.approve(farm, wad);
StakingRewardsLike(farm).stake(wad, ref);
}
function withdraw(address farm, uint256 wad) external isEngine {
StakingRewardsLike(farm).withdraw(wad);
}
function getReward(address farm, address to) external isEngine returns (uint256 amt) {
StakingRewardsLike(farm).getReward();
GemLike rewardsToken = StakingRewardsLike(farm).rewardsToken();
amt = rewardsToken.balanceOf(address(this));
rewardsToken.transfer(to, amt);
}
}
Multicall.sol 24 lines
// SPDX-License-Identifier: GPL-2.0-or-later
// Based on https://github.com/Uniswap/v3-periphery/blob/697c2474757ea89fec12a4e6db16a574fe259610/contracts/base/Multicall.sol
pragma solidity ^0.8.21;
// Enables calling multiple methods in a single call to the contract
abstract contract Multicall {
function multicall(bytes[] calldata data) external returns (bytes[] memory results) {
results = new bytes[](data.length);
for (uint256 i = 0; i < data.length; i++) {
(bool success, bytes memory result) = address(this).delegatecall(data[i]);
if (!success) {
if (result.length == 0) revert("multicall failed");
assembly ("memory-safe") {
revert(add(32, result), mload(result))
}
}
results[i] = result;
}
}
}
Read Contract
farms 0x421adfa0 → uint8
fee 0xddca3f43 → uint256
ilk 0xc5ce281e → bytes32
isUrnAuth 0x631c84a5 → bool
jug 0x84718d89 → address
lssky 0x6a6e9edf → address
ownerUrns 0xd9f06192 → address
ownerUrnsCount 0xa1c03731 → uint256
sky 0x69231804 → address
urnAuctions 0xfdc56a18 → uint256
urnCan 0xb2b192e6 → uint256
urnFarms 0x2a95b45d → address
urnImplementation 0xe88e94be → address
urnOwners 0x3d64fc52 → address
urnVoteDelegates 0xd9c415f4 → address
usds 0x4cf282fb → address
usdsJoin 0xfa1e2e86 → address
vat 0x36569e77 → address
voteDelegateFactory 0x1b7a353e → address
wards 0xbf353dbb → uint256
Write Contract 21 functions
These functions modify contract state and require a wallet transaction to execute.
addFarm 0xaff7b07d
address farm
delFarm 0xac57c9bc
address farm
deny 0x9c52a7f1
address usr
draw 0x7abdf250
address owner
uint256 index
address to
uint256 wad
file 0xd4e8be83
bytes32 what
address data
free 0xbf0700fe
address owner
uint256 index
address to
uint256 wad
returns: uint256
freeNoFee 0x1c6eb67b
address owner
uint256 index
address to
uint256 wad
getReward 0x58771079
address owner
uint256 index
address farm
address to
returns: uint256
hope 0x90a01441
address owner
uint256 index
address usr
lock 0x6c3dead4
address owner
uint256 index
uint256 wad
uint16 ref
multicall 0xac9650d8
bytes[] data
returns: bytes[]
nope 0xa496d520
address owner
uint256 index
address usr
onKick 0x5c2e41c1
address urn
uint256 wad
onRemove 0x2d074bbd
address urn
uint256 sold
uint256 left
onTake 0xd0294ea5
address urn
address who
uint256 wad
open 0x690e7c09
uint256 index
returns: address
rely 0x65fae35e
address usr
selectFarm 0xb5331d5e
address owner
uint256 index
address farm
uint16 ref
selectVoteDelegate 0x0adfd1bf
address owner
uint256 index
address voteDelegate
wipe 0xc3b6cb4b
address owner
uint256 index
uint256 wad
wipeAll 0x6ddb4566
address owner
uint256 index
returns: uint256
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