Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Jug
- Optimization enabled
- true
- Compiler version
- v0.6.12+commit.27d51765
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2025-04-18T14:03:15.699463Z
Constructor Arguments
0x00000000000000000000000016ca93f2f65d5495c874109fff38d11d39850b67
Arg [0] (address) : 0x16ca93f2f65d5495c874109fff38d11d39850b67
Contract source code
// SPDX-License-Identifier: AGPL-3.0-or-later
/// jug.sol -- Dai Lending Rate
pragma solidity ^0.6.12;
interface VatLike {
function ilks(bytes32) external returns (
uint256 Art, // [wad]
uint256 rate // [ray]
);
function fold(bytes32,address,int) external;
}
contract Jug {
// --- Auth ---
mapping (address => uint) public wards;
function rely(address usr) external auth { wards[usr] = 1; }
function deny(address usr) external auth { wards[usr] = 0; }
modifier auth {
require(wards[msg.sender] == 1, "Jug/not-authorized");
_;
}
// --- Data ---
struct Ilk {
uint256 duty; // Collateral-specific, per-second stability fee contribution [ray]
uint256 rho; // Time of last drip [unix epoch time]
}
mapping (bytes32 => Ilk) public ilks;
VatLike public vat; // CDP Engine
address public vow; // Debt Engine
uint256 public base; // Global, per-second stability fee contribution [ray]
// --- Events ---
event Init(bytes32 indexed ilk, uint256 duty, uint256 rho);
event FileIlk(bytes32 indexed ilk, bytes32 indexed what, uint256 data);
event File(bytes32 indexed what, uint256 data);
event FileAddress(bytes32 indexed what, address data);
event Drip(bytes32 indexed ilk, uint256 rate);
// --- Init ---
constructor(address vat_) public {
wards[msg.sender] = 1;
vat = VatLike(vat_);
}
// --- Math ---
function _rpow(uint x, uint n, uint b) internal pure returns (uint z) {
assembly {
switch x case 0 {switch n case 0 {z := b} default {z := 0}}
default {
switch mod(n, 2) case 0 { z := b } default { z := x }
let half := div(b, 2) // for rounding.
for { n := div(n, 2) } n { n := div(n,2) } {
let xx := mul(x, x)
if iszero(eq(div(xx, x), x)) { revert(0,0) }
let xxRound := add(xx, half)
if lt(xxRound, xx) { revert(0,0) }
x := div(xxRound, b)
if mod(n,2) {
let zx := mul(z, x)
if and(iszero(iszero(x)), iszero(eq(div(zx, x), z))) { revert(0,0) }
let zxRound := add(zx, half)
if lt(zxRound, zx) { revert(0,0) }
z := div(zxRound, b)
}
}
}
}
}
uint256 constant ONE = 10 ** 27;
function _add(uint x, uint y) internal pure returns (uint z) {
z = x + y;
require(z >= x);
}
function _diff(uint x, uint y) internal pure returns (int z) {
z = int(x) - int(y);
require(int(x) >= 0 && int(y) >= 0);
}
function _rmul(uint x, uint y) internal pure returns (uint z) {
z = x * y;
require(y == 0 || z / y == x);
z = z / ONE;
}
// --- Administration ---
function init(bytes32 ilk) external auth {
Ilk storage i = ilks[ilk];
require(i.duty == 0, "Jug/ilk-already-init");
i.duty = ONE;
i.rho = now;
emit Init(ilk, i.duty, i.rho);
}
function file(bytes32 ilk, bytes32 what, uint data) external auth {
require(ilks[ilk].rho > 0, "Jug/ilk-not-initialized");
if (what == "duty") ilks[ilk].duty = data;
else revert("Jug/file-unrecognized-param");
emit FileIlk(ilk, what, data);
}
function file(bytes32 what, uint data) external auth {
if (what == "base") base = data;
else revert("Jug/file-unrecognized-param");
emit File(what, data);
}
function file(bytes32 what, address data) external auth {
if (what == "vow") vow = data;
else revert("Jug/file-unrecognized-param");
emit FileAddress(what, data);
}
// --- Stability Fee Collection ---
function drip(bytes32 ilk) external returns (uint rate) {
require(now >= ilks[ilk].rho, "Jug/invalid-now");
(, uint prev) = vat.ilks(ilk);
rate = _rmul(_rpow(_add(base, ilks[ilk].duty), now - ilks[ilk].rho, ONE), prev);
vat.fold(ilk, vow, _diff(rate, prev));
ilks[ilk].rho = now;
emit Drip(ilk, rate);
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"vat_","internalType":"address"}]},{"type":"event","name":"Drip","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32","indexed":true},{"type":"uint256","name":"rate","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"File","inputs":[{"type":"bytes32","name":"what","internalType":"bytes32","indexed":true},{"type":"uint256","name":"data","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"FileAddress","inputs":[{"type":"bytes32","name":"what","internalType":"bytes32","indexed":true},{"type":"address","name":"data","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"FileIlk","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32","indexed":true},{"type":"bytes32","name":"what","internalType":"bytes32","indexed":true},{"type":"uint256","name":"data","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Init","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32","indexed":true},{"type":"uint256","name":"duty","internalType":"uint256","indexed":false},{"type":"uint256","name":"rho","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"base","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"deny","inputs":[{"type":"address","name":"usr","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"rate","internalType":"uint256"}],"name":"drip","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"file","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32"},{"type":"bytes32","name":"what","internalType":"bytes32"},{"type":"uint256","name":"data","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"file","inputs":[{"type":"bytes32","name":"what","internalType":"bytes32"},{"type":"uint256","name":"data","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"file","inputs":[{"type":"bytes32","name":"what","internalType":"bytes32"},{"type":"address","name":"data","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"duty","internalType":"uint256"},{"type":"uint256","name":"rho","internalType":"uint256"}],"name":"ilks","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"init","inputs":[{"type":"bytes32","name":"ilk","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"rely","inputs":[{"type":"address","name":"usr","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract VatLike"}],"name":"vat","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"vow","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"wards","inputs":[{"type":"address","name":"","internalType":"address"}]}]
Contract Creation Code
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ByteCode
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