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openzeppelin-contracts-upgradeable
Commit 7a517138 by Hadrien Croubois
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Merge upstream openzeppelin-contracts into upstream-patched

parents 5ebe900d 5cd86f74
Showing with 1099 additions and 251 deletions
.github/workflows/test.yml
......@@ -15,7 +15,7 @@ jobs:
- uses: actions/checkout@v2
- uses: actions/setup-node@v2
with:
node-version: 10.x
node-version: 12.x
- uses: actions/cache@v2
id: cache
with:
......
CHANGELOG.md
......@@ -6,6 +6,10 @@
## 4.1.0 (2021-04-29)
* `ERC20Votes`: add a new extension of the `ERC20` token with support for voting snapshots and delegation. This extension is compatible with Compound's `Comp` token interface. ([#2632](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2632))
## Unreleased
* `IERC20Metadata`: add a new extended interface that includes the optional `name()`, `symbol()` and `decimals()` functions. ([#2561](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2561))
* `ERC777`: make reception acquirement optional in `_mint`. ([#2552](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2552))
* `ERC20Permit`: add a `_useNonce` to enable further usage of ERC712 signatures. ([#2565](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2565))
......
contracts/mocks/ERC20VotesMock.sol 0 → 100644
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../token/ERC20/extensions/draft-ERC20Votes.sol";
contract ERC20VotesMock is ERC20Votes {
constructor (
string memory name,
string memory symbol,
address initialAccount,
uint256 initialBalance
) payable ERC20(name, symbol) ERC20Permit(name) {
_mint(initialAccount, initialBalance);
}
function getChainId() external view returns (uint256) {
return block.chainid;
}
}
contracts/token/ERC20/README.adoc
......@@ -21,6 +21,7 @@ Additionally there are multiple custom extensions, including:
* {ERC20Snapshot}: efficient storage of past token balances to be later queried at any point in time.
* {ERC20Permit}: gasless approval of tokens (standardized as ERC2612).
* {ERC20FlashMint}: token level support for flash loans through the minting and burning of ephemeral tokens (standardized as ERC3156).
* {ERC20Votes}: support for voting and vote delegation (compatible with Compound's token).
Finally, there are some utilities to interact with ERC20 contracts in various ways.
......@@ -31,6 +32,7 @@ The following related EIPs are in draft status.
- {ERC20Permit}
- {ERC20FlashMint}
- {ERC20Votes}
NOTE: This core set of contracts is designed to be unopinionated, allowing developers to access the internal functions in ERC20 (such as <<ERC20-_mint-address-uint256-,`_mint`>>) and expose them as external functions in the way they prefer. On the other hand, xref:ROOT:erc20.adoc#Presets[ERC20 Presets] (such as {ERC20PresetMinterPauser}) are designed using opinionated patterns to provide developers with ready to use, deployable contracts.
......@@ -60,6 +62,8 @@ The following EIPs are still in Draft status. Due to their nature as drafts, the
{{ERC20FlashMint}}
{{ERC20Votes}}
== Presets
These contracts are preconfigured combinations of the above features. They can be used through inheritance or as models to copy and paste their source code.
......
contracts/token/ERC20/extensions/ERC20Snapshot.sol
......@@ -20,6 +20,13 @@ import "../../../utils/Counters.sol";
* id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id
* and the account address.
*
* NOTE: Snapshot policy can be customized by overriding the {_getCurrentSnapshotId} method. For example, having it
* return `block.number` will trigger the creation of snapshot at the begining of each new block. When overridding this
* function, be careful about the monotonicity of its result. Non-monotonic snapshot ids will break the contract.
*
* Implementing snapshots for every block using this method will incur significant gas costs. For a gas-efficient
* alternative consider {ERC20Votes}.
*
* ==== Gas Costs
*
* Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log
......@@ -30,6 +37,7 @@ import "../../../utils/Counters.sol";
* only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent
* transfers will have normal cost until the next snapshot, and so on.
*/
abstract contract ERC20Snapshot is ERC20 {
// Inspired by Jordi Baylina's MiniMeToken to record historical balances:
// https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol
......@@ -79,12 +87,19 @@ abstract contract ERC20Snapshot is ERC20 {
function _snapshot() internal virtual returns (uint256) {
_currentSnapshotId.increment();
uint256 currentId = _currentSnapshotId.current();
uint256 currentId = _getCurrentSnapshotId();
emit Snapshot(currentId);
return currentId;
}
/**
* @dev Get the current snapshotId
*/
function _getCurrentSnapshotId() internal view virtual returns (uint256) {
return _currentSnapshotId.current();
}
/**
* @dev Retrieves the balance of `account` at the time `snapshotId` was created.
*/
function balanceOfAt(address account, uint256 snapshotId) public view virtual returns (uint256) {
......@@ -102,7 +117,6 @@ abstract contract ERC20Snapshot is ERC20 {
return snapshotted ? value : totalSupply();
}
// Update balance and/or total supply snapshots before the values are modified. This is implemented
// in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
......@@ -127,8 +141,7 @@ abstract contract ERC20Snapshot is ERC20 {
private view returns (bool, uint256)
{
require(snapshotId > 0, "ERC20Snapshot: id is 0");
// solhint-disable-next-line max-line-length
require(snapshotId <= _currentSnapshotId.current(), "ERC20Snapshot: nonexistent id");
require(snapshotId <= _getCurrentSnapshotId(), "ERC20Snapshot: nonexistent id");
// When a valid snapshot is queried, there are three possibilities:
// a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never
......@@ -162,7 +175,7 @@ abstract contract ERC20Snapshot is ERC20 {
}
function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private {
uint256 currentId = _currentSnapshotId.current();
uint256 currentId = _getCurrentSnapshotId();
if (_lastSnapshotId(snapshots.ids) < currentId) {
snapshots.ids.push(currentId);
snapshots.values.push(currentValue);
......
contracts/token/ERC20/extensions/draft-ERC20Votes.sol 0 → 100644
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./draft-ERC20Permit.sol";
import "./draft-IERC20Votes.sol";
import "../../../utils/math/Math.sol";
import "../../../utils/math/SafeCast.sol";
import "../../../utils/cryptography/ECDSA.sol";
/**
* @dev Extension of the ERC20 token contract to support Compound's voting and delegation.
*
* This extensions keeps a history (checkpoints) of each account's vote power. Vote power can be delegated either
* by calling the {delegate} function directly, or by providing a signature to be used with {delegateBySig}. Voting
* power can be queried through the public accessors {getCurrentVotes} and {getPriorVotes}.
*
* By default, token balance does not account for voting power. This makes transfers cheaper. The downside is that it
* requires users to delegate to themselves in order to activate checkpoints and have their voting power tracked.
* Enabling self-delegation can easily be done by overriding the {delegates} function. Keep in mind however that this
* will significantly increase the base gas cost of transfers.
*
* _Available since v4.2._
*/
abstract contract ERC20Votes is IERC20Votes, ERC20Permit {
bytes32 private constant _DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
mapping (address => address) private _delegates;
mapping (address => Checkpoint[]) private _checkpoints;
/**
* @dev Get the `pos`-th checkpoint for `account`.
*/
function checkpoints(address account, uint32 pos) external view virtual override returns (Checkpoint memory) {
return _checkpoints[account][pos];
}
/**
* @dev Get number of checkpoints for `account`.
*/
function numCheckpoints(address account) external view virtual override returns (uint32) {
return SafeCast.toUint32(_checkpoints[account].length);
}
/**
* @dev Get the address `account` is currently delegating to.
*/
function delegates(address account) public view virtual override returns (address) {
return _delegates[account];
}
/**
* @dev Gets the current votes balance for `account`
*/
function getCurrentVotes(address account) external view override returns (uint256) {
uint256 pos = _checkpoints[account].length;
return pos == 0 ? 0 : _checkpoints[account][pos - 1].votes;
}
/**
* @dev Determine the number of votes for `account` at the begining of `blockNumber`.
*/
function getPriorVotes(address account, uint256 blockNumber) external view override returns (uint256) {
require(blockNumber < block.number, "ERC20Votes::getPriorVotes: not yet determined");
Checkpoint[] storage ckpts = _checkpoints[account];
// We run a binary search to look for the earliest checkpoint taken after `blockNumber`.
//
// During the loop, the index of the wanted checkpoint remains in the range [low, high).
// With each iteration, either `low` or `high` is moved towards the middle of the range to maintain the invariant.
// - If the middle checkpoint is after `blockNumber`, we look in [low, mid)
// - If the middle checkpoint is before `blockNumber`, we look in [mid+1, high)
// Once we reach a single value (when low == high), we've found the right checkpoint at the index high-1, if not
// out of bounds (in which case we're looking too far in the past and the result is 0).
// Note that if the latest checkpoint available is exactly for `blockNumber`, we end up with an index that is
// past the end of the array, so we technically don't find a checkpoint after `blockNumber`, but it works out
// the same.
uint256 high = ckpts.length;
uint256 low = 0;
while (low < high) {
uint256 mid = Math.average(low, high);
if (ckpts[mid].fromBlock > blockNumber) {
high = mid;
} else {
low = mid + 1;
}
}
return high == 0 ? 0 : ckpts[high - 1].votes;
}
/**
* @dev Delegate votes from the sender to `delegatee`.
*/
function delegate(address delegatee) public virtual override {
return _delegate(_msgSender(), delegatee);
}
/**
* @dev Delegates votes from signer to `delegatee`
*/
function delegateBySig(address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s)
public virtual override
{
require(block.timestamp <= expiry, "ERC20Votes::delegateBySig: signature expired");
address signer = ECDSA.recover(
_hashTypedDataV4(keccak256(abi.encode(
_DELEGATION_TYPEHASH,
delegatee,
nonce,
expiry
))),
v, r, s
);
require(nonce == _useNonce(signer), "ERC20Votes::delegateBySig: invalid nonce");
return _delegate(signer, delegatee);
}
/**
* @dev Change delegation for `delegator` to `delegatee`.
*/
function _delegate(address delegator, address delegatee) internal virtual {
address currentDelegate = delegates(delegator);
uint256 delegatorBalance = balanceOf(delegator);
_delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveVotingPower(currentDelegate, delegatee, delegatorBalance);
}
function _moveVotingPower(address src, address dst, uint256 amount) private {
if (src != dst && amount > 0) {
if (src != address(0)) {
uint256 srcCkptLen = _checkpoints[src].length;
uint256 srcCkptOld = srcCkptLen == 0 ? 0 : _checkpoints[src][srcCkptLen - 1].votes;
uint256 srcCkptNew = srcCkptOld - amount;
_writeCheckpoint(src, srcCkptLen, srcCkptOld, srcCkptNew);
}
if (dst != address(0)) {
uint256 dstCkptLen = _checkpoints[dst].length;
uint256 dstCkptOld = dstCkptLen == 0 ? 0 : _checkpoints[dst][dstCkptLen - 1].votes;
uint256 dstCkptNew = dstCkptOld + amount;
_writeCheckpoint(dst, dstCkptLen, dstCkptOld, dstCkptNew);
}
}
}
function _writeCheckpoint(address delegatee, uint256 pos, uint256 oldWeight, uint256 newWeight) private {
if (pos > 0 && _checkpoints[delegatee][pos - 1].fromBlock == block.number) {
_checkpoints[delegatee][pos - 1].votes = SafeCast.toUint224(newWeight);
} else {
_checkpoints[delegatee].push(Checkpoint({
fromBlock: SafeCast.toUint32(block.number),
votes: SafeCast.toUint224(newWeight)
}));
}
emit DelegateVotesChanged(delegatee, oldWeight, newWeight);
}
function _mint(address account, uint256 amount) internal virtual override {
super._mint(account, amount);
require(totalSupply() <= type(uint224).max, "ERC20Votes: total supply exceeds 2**224");
}
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
_moveVotingPower(delegates(from), delegates(to), amount);
}
}
contracts/token/ERC20/extensions/draft-IERC20Votes.sol 0 → 100644
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC20.sol";
interface IERC20Votes is IERC20 {
struct Checkpoint {
uint32 fromBlock;
uint224 votes;
}
event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);
function delegates(address owner) external view returns (address);
function checkpoints(address account, uint32 pos) external view returns (Checkpoint memory);
function numCheckpoints(address account) external view returns (uint32);
function getCurrentVotes(address account) external view returns (uint256);
function getPriorVotes(address account, uint256 blockNumber) external view returns (uint256);
function delegate(address delegatee) external;
function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) external;
}
contracts/utils/math/SafeCast.sol
......@@ -19,6 +19,21 @@ pragma solidity ^0.8.0;
*/
library SafeCast {
/**
* @dev Returns the downcasted uint224 from uint256, reverting on
* overflow (when the input is greater than largest uint224).
*
* Counterpart to Solidity's `uint224` operator.
*
* Requirements:
*
* - input must fit into 224 bits
*/
function toUint224(uint256 value) internal pure returns (uint224) {
require(value < 2**224, "SafeCast: value doesn\'t fit in 224 bits");
return uint224(value);
}
/**
* @dev Returns the downcasted uint128 from uint256, reverting on
* overflow (when the input is greater than largest uint128).
*
......
package-lock.json
......@@ -1332,12 +1332,6 @@
"node": ">=8"
}
},
"node_modules/@oclif/config/node_modules/tslib": {
"version": "2.2.0",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.2.0.tgz",
"integrity": "sha512-gS9GVHRU+RGn5KQM2rllAlR3dU6m7AcpJKdtH8gFvQiC4Otgk98XnmMU+nZenHt/+VhnBPWwgrJsyrdcw6i23w==",
"dev": true
},
"node_modules/@oclif/errors": {
"version": "1.3.4",
"resolved": "https://registry.npmjs.org/@oclif/errors/-/errors-1.3.4.tgz",
......@@ -1472,6 +1466,12 @@
"node": ">=4"
}
},
"node_modules/@oclif/parser/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@oclif/plugin-help": {
"version": "3.2.2",
"resolved": "https://registry.npmjs.org/@oclif/plugin-help/-/plugin-help-3.2.2.tgz",
......@@ -1715,6 +1715,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/core/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@sentry/hub": {
"version": "5.30.0",
"resolved": "https://registry.npmjs.org/@sentry/hub/-/hub-5.30.0.tgz",
......@@ -1729,6 +1735,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/hub/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@sentry/minimal": {
"version": "5.30.0",
"resolved": "https://registry.npmjs.org/@sentry/minimal/-/minimal-5.30.0.tgz",
......@@ -1743,6 +1755,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/minimal/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@sentry/node": {
"version": "5.30.0",
"resolved": "https://registry.npmjs.org/@sentry/node/-/node-5.30.0.tgz",
......@@ -1763,6 +1781,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/node/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@sentry/tracing": {
"version": "5.30.0",
"resolved": "https://registry.npmjs.org/@sentry/tracing/-/tracing-5.30.0.tgz",
......@@ -1779,6 +1803,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/tracing/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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"dev": true
},
"node_modules/@sentry/types": {
"version": "5.30.0",
"resolved": "https://registry.npmjs.org/@sentry/types/-/types-5.30.0.tgz",
......@@ -1801,6 +1831,12 @@
"node": ">=6"
}
},
"node_modules/@sentry/utils/node_modules/tslib": {
"version": "1.14.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
"dev": true
},
"node_modules/@sindresorhus/is": {
"version": "0.14.0",
"resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
......@@ -1909,16 +1945,16 @@
}
},
"node_modules/@truffle/contract": {
"version": "4.3.15",
"resolved": "https://registry.npmjs.org/@truffle/contract/-/contract-4.3.15.tgz",
"integrity": "sha512-PHM6tCF/GB3r/t5YbeXagtg9XPtjFgbc5YnRcXs8m2Cp2hXFeU91n1dxmIkBVJklia+tWGqLuVxvMqI88tcWbw==",
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"dev": true,
"dependencies": {
"@truffle/blockchain-utils": "^0.0.29",
"@truffle/contract-schema": "^3.4.0",
"@truffle/debug-utils": "^5.0.15",
"@truffle/error": "^0.0.13",
"@truffle/interface-adapter": "^0.4.22",
"@truffle/blockchain-utils": "^0.0.30",
"@truffle/contract-schema": "^3.4.1",
"@truffle/debug-utils": "^5.0.16",
"@truffle/error": "^0.0.14",
"@truffle/interface-adapter": "^0.4.23",
"bignumber.js": "^7.2.1",
"ethereum-ens": "^0.8.0",
"ethers": "^4.0.32",
......@@ -1930,9 +1966,9 @@
}
},
"node_modules/@truffle/contract-schema": {
"version": "3.4.0",
"resolved": "https://registry.npmjs.org/@truffle/contract-schema/-/contract-schema-3.4.0.tgz",
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"dev": true,
"dependencies": {
"ajv": "^6.10.0",
......@@ -1941,15 +1977,15 @@
}
},
"node_modules/@truffle/contract/node_modules/@truffle/blockchain-utils": {
"version": "0.0.29",
"resolved": "https://registry.npmjs.org/@truffle/blockchain-utils/-/blockchain-utils-0.0.29.tgz",
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"dev": true
},
"node_modules/@truffle/contract/node_modules/@truffle/codec": {
"version": "0.10.5",
"resolved": "https://registry.npmjs.org/@truffle/codec/-/codec-0.10.5.tgz",
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"dev": true,
"dependencies": {
"big.js": "^5.2.2",
......@@ -1966,12 +2002,12 @@
}
},
"node_modules/@truffle/contract/node_modules/@truffle/debug-utils": {
"version": "5.0.15",
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"resolved": "https://registry.npmjs.org/@truffle/debug-utils/-/debug-utils-5.0.16.tgz",
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"dev": true,
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test/token/ERC20/extensions/draft-ERC20Votes.test.js 0 → 100644
/* eslint-disable */
const { BN, constants, expectEvent, expectRevert, time } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');
const { MAX_UINT256, ZERO_ADDRESS, ZERO_BYTES32 } = constants;
const { fromRpcSig } = require('ethereumjs-util');
const ethSigUtil = require('eth-sig-util');
const Wallet = require('ethereumjs-wallet').default;
const { promisify } = require('util');
const queue = promisify(setImmediate);
const ERC20VotesMock = artifacts.require('ERC20VotesMock');
const { EIP712Domain, domainSeparator } = require('../../../helpers/eip712');
const Delegation = [
{ name: 'delegatee', type: 'address' },
{ name: 'nonce', type: 'uint256' },
{ name: 'expiry', type: 'uint256' },
];
async function countPendingTransactions() {
return parseInt(
await network.provider.send('eth_getBlockTransactionCountByNumber', ['pending'])
);
}
async function batchInBlock (txs) {
try {
// disable auto-mining
await network.provider.send('evm_setAutomine', [false]);
// send all transactions
const promises = txs.map(fn => fn());
// wait for node to have all pending transactions
while (txs.length > await countPendingTransactions()) {
await queue();
}
// mine one block
await network.provider.send('evm_mine');
// fetch receipts
const receipts = await Promise.all(promises);
// Sanity check, all tx should be in the same block
const minedBlocks = new Set(receipts.map(({ receipt }) => receipt.blockNumber));
expect(minedBlocks.size).to.equal(1);
return receipts;
} finally {
// enable auto-mining
await network.provider.send('evm_setAutomine', [true]);
}
}
contract('ERC20Votes', function (accounts) {
const [ holder, recipient, holderDelegatee, recipientDelegatee, other1, other2 ] = accounts;
const name = 'My Token';
const symbol = 'MTKN';
const version = '1';
const supply = new BN('10000000000000000000000000');
beforeEach(async function () {
this.token = await ERC20VotesMock.new(name, symbol, holder, supply);
// We get the chain id from the contract because Ganache (used for coverage) does not return the same chain id
// from within the EVM as from the JSON RPC interface.
// See https://github.com/trufflesuite/ganache-core/issues/515
this.chainId = await this.token.getChainId();
});
it('initial nonce is 0', async function () {
expect(await this.token.nonces(holder)).to.be.bignumber.equal('0');
});
it('domain separator', async function () {
expect(
await this.token.DOMAIN_SEPARATOR(),
).to.equal(
await domainSeparator(name, version, this.chainId, this.token.address),
);
});
it('minting restriction', async function () {
const amount = new BN('2').pow(new BN('224'));
await expectRevert(
ERC20VotesMock.new(name, symbol, holder, amount),
'ERC20Votes: total supply exceeds 2**224',
);
});
describe('set delegation', function () {
describe('call', function () {
it('delegation with balance', async function () {
expect(await this.token.delegates(holder)).to.be.equal(ZERO_ADDRESS);
const { receipt } = await this.token.delegate(holder, { from: holder });
expectEvent(receipt, 'DelegateChanged', {
delegator: holder,
fromDelegate: ZERO_ADDRESS,
toDelegate: holder,
});
expectEvent(receipt, 'DelegateVotesChanged', {
delegate: holder,
previousBalance: '0',
newBalance: supply,
});
expect(await this.token.delegates(holder)).to.be.equal(holder);
expect(await this.token.getCurrentVotes(holder)).to.be.bignumber.equal(supply);
expect(await this.token.getPriorVotes(holder, receipt.blockNumber - 1)).to.be.bignumber.equal('0');
await time.advanceBlock();
expect(await this.token.getPriorVotes(holder, receipt.blockNumber)).to.be.bignumber.equal(supply);
});
it('delegation without balance', async function () {
expect(await this.token.delegates(recipient)).to.be.equal(ZERO_ADDRESS);
const { receipt } = await this.token.delegate(recipient, { from: recipient });
expectEvent(receipt, 'DelegateChanged', {
delegator: recipient,
fromDelegate: ZERO_ADDRESS,
toDelegate: recipient,
});
expectEvent.notEmitted(receipt, 'DelegateVotesChanged');
expect(await this.token.delegates(recipient)).to.be.equal(recipient);
});
});
describe('with signature', function () {
const delegator = Wallet.generate();
const delegatorAddress = web3.utils.toChecksumAddress(delegator.getAddressString());
const nonce = 0;
const buildData = (chainId, verifyingContract, message) => ({ data: {
primaryType: 'Delegation',
types: { EIP712Domain, Delegation },
domain: { name, version, chainId, verifyingContract },
message,
}});
beforeEach(async function () {
await this.token.transfer(delegatorAddress, supply, { from: holder });
});
it('accept signed delegation', async function () {
const { v, r, s } = fromRpcSig(ethSigUtil.signTypedMessage(
delegator.getPrivateKey(),
buildData(this.chainId, this.token.address, {
delegatee: delegatorAddress,
nonce,
expiry: MAX_UINT256,
}),
));
expect(await this.token.delegates(delegatorAddress)).to.be.equal(ZERO_ADDRESS);
const { receipt } = await this.token.delegateBySig(delegatorAddress, nonce, MAX_UINT256, v, r, s);
expectEvent(receipt, 'DelegateChanged', {
delegator: delegatorAddress,
fromDelegate: ZERO_ADDRESS,
toDelegate: delegatorAddress,
});
expectEvent(receipt, 'DelegateVotesChanged', {
delegate: delegatorAddress,
previousBalance: '0',
newBalance: supply,
});
expect(await this.token.delegates(delegatorAddress)).to.be.equal(delegatorAddress);
expect(await this.token.getCurrentVotes(delegatorAddress)).to.be.bignumber.equal(supply);
expect(await this.token.getPriorVotes(delegatorAddress, receipt.blockNumber - 1)).to.be.bignumber.equal('0');
await time.advanceBlock();
expect(await this.token.getPriorVotes(delegatorAddress, receipt.blockNumber)).to.be.bignumber.equal(supply);
});
it('rejects reused signature', async function () {
const { v, r, s } = fromRpcSig(ethSigUtil.signTypedMessage(
delegator.getPrivateKey(),
buildData(this.chainId, this.token.address, {
delegatee: delegatorAddress,
nonce,
expiry: MAX_UINT256,
}),
));
await this.token.delegateBySig(delegatorAddress, nonce, MAX_UINT256, v, r, s);
await expectRevert(
this.token.delegateBySig(delegatorAddress, nonce, MAX_UINT256, v, r, s),
'ERC20Votes::delegateBySig: invalid nonce',
);
});
it('rejects bad delegatee', async function () {
const { v, r, s } = fromRpcSig(ethSigUtil.signTypedMessage(
delegator.getPrivateKey(),
buildData(this.chainId, this.token.address, {
delegatee: delegatorAddress,
nonce,
expiry: MAX_UINT256,
}),
));
const { logs } = await this.token.delegateBySig(holderDelegatee, nonce, MAX_UINT256, v, r, s);
const { args } = logs.find(({ event }) => event == 'DelegateChanged');
expect(args.delegator).to.not.be.equal(delegatorAddress);
expect(args.fromDelegate).to.be.equal(ZERO_ADDRESS);
expect(args.toDelegate).to.be.equal(holderDelegatee);
});
it('rejects bad nonce', async function () {
const { v, r, s } = fromRpcSig(ethSigUtil.signTypedMessage(
delegator.getPrivateKey(),
buildData(this.chainId, this.token.address, {
delegatee: delegatorAddress,
nonce,
expiry: MAX_UINT256,
}),
));
await expectRevert(
this.token.delegateBySig(delegatorAddress, nonce + 1, MAX_UINT256, v, r, s),
'ERC20Votes::delegateBySig: invalid nonce',
);
});
it('rejects expired permit', async function () {
const expiry = (await time.latest()) - time.duration.weeks(1);
const { v, r, s } = fromRpcSig(ethSigUtil.signTypedMessage(
delegator.getPrivateKey(),
buildData(this.chainId, this.token.address, {
delegatee: delegatorAddress,
nonce,
expiry,
}),
));
await expectRevert(
this.token.delegateBySig(delegatorAddress, nonce, expiry, v, r, s),
'ERC20Votes::delegateBySig: signature expired',
);
});
});
});
describe('change delegation', function () {
beforeEach(async function () {
await this.token.delegate(holder, { from: holder });
});
it('call', async function () {
expect(await this.token.delegates(holder)).to.be.equal(holder);
const { receipt } = await this.token.delegate(holderDelegatee, { from: holder });
expectEvent(receipt, 'DelegateChanged', {
delegator: holder,
fromDelegate: holder,
toDelegate: holderDelegatee,
});
expectEvent(receipt, 'DelegateVotesChanged', {
delegate: holder,
previousBalance: supply,
newBalance: '0',
});
expectEvent(receipt, 'DelegateVotesChanged', {
delegate: holderDelegatee,
previousBalance: '0',
newBalance: supply,
});
expect(await this.token.delegates(holder)).to.be.equal(holderDelegatee);
expect(await this.token.getCurrentVotes(holder)).to.be.bignumber.equal('0');
expect(await this.token.getCurrentVotes(holderDelegatee)).to.be.bignumber.equal(supply);
expect(await this.token.getPriorVotes(holder, receipt.blockNumber - 1)).to.be.bignumber.equal(supply);
expect(await this.token.getPriorVotes(holderDelegatee, receipt.blockNumber - 1)).to.be.bignumber.equal('0');
await time.advanceBlock();
expect(await this.token.getPriorVotes(holder, receipt.blockNumber)).to.be.bignumber.equal('0');
expect(await this.token.getPriorVotes(holderDelegatee, receipt.blockNumber)).to.be.bignumber.equal(supply);
});
});
describe('transfers', function () {
it('no delegation', async function () {
const { receipt } = await this.token.transfer(recipient, 1, { from: holder });
expectEvent(receipt, 'Transfer', { from: holder, to: recipient, value: '1' });
expectEvent.notEmitted(receipt, 'DelegateVotesChanged');
this.holderVotes = '0';
this.recipientVotes = '0';
});
it('sender delegation', async function () {
await this.token.delegate(holder, { from: holder });
const { receipt } = await this.token.transfer(recipient, 1, { from: holder });
expectEvent(receipt, 'Transfer', { from: holder, to: recipient, value: '1' });
expectEvent(receipt, 'DelegateVotesChanged', { delegate: holder, previousBalance: supply, newBalance: supply.subn(1) });
this.holderVotes = supply.subn(1);
this.recipientVotes = '0';
});
it('receiver delegation', async function () {
await this.token.delegate(recipient, { from: recipient });
const { receipt } = await this.token.transfer(recipient, 1, { from: holder });
expectEvent(receipt, 'Transfer', { from: holder, to: recipient, value: '1' });
expectEvent(receipt, 'DelegateVotesChanged', { delegate: recipient, previousBalance: '0', newBalance: '1' });
this.holderVotes = '0';
this.recipientVotes = '1';
});
it('full delegation', async function () {
await this.token.delegate(holder, { from: holder });
await this.token.delegate(recipient, { from: recipient });
const { receipt } = await this.token.transfer(recipient, 1, { from: holder });
expectEvent(receipt, 'Transfer', { from: holder, to: recipient, value: '1' });
expectEvent(receipt, 'DelegateVotesChanged', { delegate: holder, previousBalance: supply, newBalance: supply.subn(1) });
expectEvent(receipt, 'DelegateVotesChanged', { delegate: recipient, previousBalance: '0', newBalance: '1' });
this.holderVotes = supply.subn(1);
this.recipientVotes = '1';
});
afterEach(async function () {
expect(await this.token.getCurrentVotes(holder)).to.be.bignumber.equal(this.holderVotes);
expect(await this.token.getCurrentVotes(recipient)).to.be.bignumber.equal(this.recipientVotes);
// need to advance 2 blocks to see the effect of a transfer on "getPriorVotes"
const blockNumber = await time.latestBlock();
await time.advanceBlock();
expect(await this.token.getPriorVotes(holder, blockNumber)).to.be.bignumber.equal(this.holderVotes);
expect(await this.token.getPriorVotes(recipient, blockNumber)).to.be.bignumber.equal(this.recipientVotes);
});
});
// The following tests are a adaptation of https://github.com/compound-finance/compound-protocol/blob/master/tests/Governance/CompTest.js.
describe('Compound test suite', function () {
describe('balanceOf', function () {
it('grants to initial account', async function () {
expect(await this.token.balanceOf(holder)).to.be.bignumber.equal('10000000000000000000000000');
});
});
describe('numCheckpoints', function () {
it('returns the number of checkpoints for a delegate', async function () {
await this.token.transfer(recipient, '100', { from: holder }); //give an account a few tokens for readability
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('0');
const t1 = await this.token.delegate(other1, { from: recipient });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('1');
const t2 = await this.token.transfer(other2, 10, { from: recipient });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('2');
const t3 = await this.token.transfer(other2, 10, { from: recipient });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('3');
const t4 = await this.token.transfer(recipient, 20, { from: holder });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('4');
expect(await this.token.checkpoints(other1, 0)).to.be.deep.equal([ t1.receipt.blockNumber.toString(), '100' ]);
expect(await this.token.checkpoints(other1, 1)).to.be.deep.equal([ t2.receipt.blockNumber.toString(), '90' ]);
expect(await this.token.checkpoints(other1, 2)).to.be.deep.equal([ t3.receipt.blockNumber.toString(), '80' ]);
expect(await this.token.checkpoints(other1, 3)).to.be.deep.equal([ t4.receipt.blockNumber.toString(), '100' ]);
await time.advanceBlock();
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber)).to.be.bignumber.equal('100');
expect(await this.token.getPriorVotes(other1, t2.receipt.blockNumber)).to.be.bignumber.equal('90');
expect(await this.token.getPriorVotes(other1, t3.receipt.blockNumber)).to.be.bignumber.equal('80');
expect(await this.token.getPriorVotes(other1, t4.receipt.blockNumber)).to.be.bignumber.equal('100');
});
it('does not add more than one checkpoint in a block', async function () {
await this.token.transfer(recipient, '100', { from: holder });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('0');
const [ t1, t2, t3 ] = await batchInBlock([
() => this.token.delegate(other1, { from: recipient, gas: 100000 }),
() => this.token.transfer(other2, 10, { from: recipient, gas: 100000 }),
() => this.token.transfer(other2, 10, { from: recipient, gas: 100000 }),
]);
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('1');
expect(await this.token.checkpoints(other1, 0)).to.be.deep.equal([ t1.receipt.blockNumber.toString(), '80' ]);
// expectReve(await this.token.checkpoints(other1, 1)).to.be.deep.equal([ '0', '0' ]); // Reverts due to array overflow check
// expect(await this.token.checkpoints(other1, 2)).to.be.deep.equal([ '0', '0' ]); // Reverts due to array overflow check
const t4 = await this.token.transfer(recipient, 20, { from: holder });
expect(await this.token.numCheckpoints(other1)).to.be.bignumber.equal('2');
expect(await this.token.checkpoints(other1, 1)).to.be.deep.equal([ t4.receipt.blockNumber.toString(), '100' ]);
});
});
describe('getPriorVotes', function () {
it('reverts if block number >= current block', async function () {
await expectRevert(
this.token.getPriorVotes(other1, 5e10),
'ERC20Votes::getPriorVotes: not yet determined',
);
});
it('returns 0 if there are no checkpoints', async function () {
expect(await this.token.getPriorVotes(other1, 0)).to.be.bignumber.equal('0');
});
it('returns the latest block if >= last checkpoint block', async function () {
const t1 = await this.token.delegate(other1, { from: holder });
await time.advanceBlock();
await time.advanceBlock();
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber)).to.be.bignumber.equal('10000000000000000000000000');
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber + 1)).to.be.bignumber.equal('10000000000000000000000000');
});
it('returns zero if < first checkpoint block', async function () {
await time.advanceBlock();
const t1 = await this.token.delegate(other1, { from: holder });
await time.advanceBlock();
await time.advanceBlock();
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber - 1)).to.be.bignumber.equal('0');
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber + 1)).to.be.bignumber.equal('10000000000000000000000000');
});
it('generally returns the voting balance at the appropriate checkpoint', async function () {
const t1 = await this.token.delegate(other1, { from: holder });
await time.advanceBlock();
await time.advanceBlock();
const t2 = await this.token.transfer(other2, 10, { from: holder });
await time.advanceBlock();
await time.advanceBlock();
const t3 = await this.token.transfer(other2, 10, { from: holder });
await time.advanceBlock();
await time.advanceBlock();
const t4 = await this.token.transfer(holder, 20, { from: other2 });
await time.advanceBlock();
await time.advanceBlock();
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber - 1)).to.be.bignumber.equal('0');
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber)).to.be.bignumber.equal('10000000000000000000000000');
expect(await this.token.getPriorVotes(other1, t1.receipt.blockNumber + 1)).to.be.bignumber.equal('10000000000000000000000000');
expect(await this.token.getPriorVotes(other1, t2.receipt.blockNumber)).to.be.bignumber.equal('9999999999999999999999990');
expect(await this.token.getPriorVotes(other1, t2.receipt.blockNumber + 1)).to.be.bignumber.equal('9999999999999999999999990');
expect(await this.token.getPriorVotes(other1, t3.receipt.blockNumber)).to.be.bignumber.equal('9999999999999999999999980');
expect(await this.token.getPriorVotes(other1, t3.receipt.blockNumber + 1)).to.be.bignumber.equal('9999999999999999999999980');
expect(await this.token.getPriorVotes(other1, t4.receipt.blockNumber)).to.be.bignumber.equal('10000000000000000000000000');
expect(await this.token.getPriorVotes(other1, t4.receipt.blockNumber + 1)).to.be.bignumber.equal('10000000000000000000000000');
});
});
});
});
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