From 40d3e96ec7c09b8ad13e8c123a4fffdbf607af91 Mon Sep 17 00:00:00 2001 From: Matt Swezey Date: Sun, 20 Jan 2019 21:58:00 -0600 Subject: [PATCH 01/12] =?UTF-8?q?=E2=9C=8F=EF=B8=8F=20Refactor=20code=20&?= =?UTF-8?q?=20Refork=20OZ=20Repo?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .DS_Store | Bin 0 -> 8196 bytes contracts/.DS_Store | Bin 0 -> 8196 bytes contracts/mocks/ERC20SnapshotMock.sol | 23 + contracts/token/.DS_Store | Bin 0 -> 6148 bytes contracts/token/ERC20/ERC20Snapshot.sol | 192 ++ contracts/token/ERC20/IERC20Snapshot.sol | 38 + test/.DS_Store | Bin 0 -> 6148 bytes test/token/.DS_Store | Bin 0 -> 6148 bytes test/token/ERC20/ERC20Snapshot.test.js | 634 +++++ yarn.lock | 2938 ++++++++++++++++++++++ 10 files changed, 3825 insertions(+) create mode 100644 .DS_Store create mode 100644 contracts/.DS_Store create mode 100644 contracts/mocks/ERC20SnapshotMock.sol create mode 100644 contracts/token/.DS_Store create mode 100644 contracts/token/ERC20/ERC20Snapshot.sol create mode 100644 contracts/token/ERC20/IERC20Snapshot.sol create mode 100644 test/.DS_Store create mode 100644 test/token/.DS_Store create mode 100644 test/token/ERC20/ERC20Snapshot.test.js create mode 100644 yarn.lock diff --git a/.DS_Store b/.DS_Store new file mode 100644 index 0000000000000000000000000000000000000000..486ab486467436a8078de7422527d2ee2c2e5b2d GIT binary patch literal 8196 zcmeHMTW-@p6ur}?)CsNHB2fG3A0$3X)v6V=LP%+v0Fj_YIDinK)_F8FxOSB|L=b}V z!ybSguoPCnLRbKtJ7Xf-al{YhIaAG?v3<`S`^=qju1iFs(5bHxEfJA{$~b=(O-kYG zTt~`8c;*67fKL>ZUB6a!{pyIVKA{!R3TOqi0$KsBz@MQ2-q~D?G4FkKRkvCJt-yb& z0PhbbDq}vxfkL@;pphv6FoV;wppQI2a?B9(Ar2HuDtxN!L4;HhrWiueaouEdU_Qiw zLPaN`=p@3CMVO%oIXZZzG$)Z)s9UXoR$x>C&fTZTrViD~iRJISkglO#`YMa0&d?6s zqHWrxn^dCPvQ(=OPp$9#0x4vwl}zvBDuuy0o%IF0W9{P`W<3v9=0v?ST7H(>JQq2ty4 zZo%((^|th5sSAdYHM0BjOTFIu#?@tWeQUG7Z1y%cx0cO~^(*~;)>yo_cD;OX{PI=r zb^pzKJQj)w_e`2o$HVpmdMV<(uv(t$drhXI&V`dzp?g%O0;a42*Sko=JvO)Wb}|!x)~_FUre8^%9m` zk?y32JF6#*hW!T#UZgSJH0GuTRUF*u=n}zlj9F)3(*Ps-$q!3kK)H0g ze{}&3g-9%$1qjr_zIup1SB8w*g$`x#$>~o7Dt4imbcjJ+v;wE5z@+lL#QA?|{P+J; z8(%xt3TOp>zXBptw2B4X$M@ff$y?%F+eAG;<-&FYg_43srsF`Fjsu7PFht*kDRc56 a4iw@H$}j&A@UwqF>-WE$N8S8g3VZ{QZKdS^ literal 0 HcmV?d00001 diff --git a/contracts/.DS_Store b/contracts/.DS_Store new file mode 100644 index 0000000000000000000000000000000000000000..94cc4bbded533b8c933cc86972c7ec07ab586f92 GIT binary patch literal 8196 zcmeHM-EI;=6h6}eUC^e)n3T)CG4X@H^^B32)D_lZhG?<@2sHhfK|XMU=^?mSOu&CS3v%JonX6+gb&z0{^7~ z;{M>G3R}~5uB^Oupphv6YzD)!ppQI2a$Id|+Rl}gRQOcc1JhKdQw*l)IPMBKY)#v_ zvWiYj(TVAqna)s{oEZ z(C^X2;C(cBIm{riufa>dlfbIj4+HDq%-;grhi9zF#BX>8ewzY{;8&bU433XACK%%s zEw4(d_bH`b9{vNYNiZg;E9Wm2OEWT9l?U&=WzSNlG%gDqhsO(Z^-L(U2H6?M1O2Y% zTW1gkak97foo#GpvbinCDL94g!mCz~k6VeCjN-aCd?CI)_L5#l_uHI@i@w)+7Wm_n z;>{x-C0-EuLrD(0J|Hij2T_-g>wFY-W9g@*4meKU$)6NU(`n`4UfHc2R%c~*TCEA*(~qu-r9fAJnc{3P2bNxe8%aZF#Q~$9rbg@3t}O)EL$LbbAn40zxi!-0EJDQ*1YnnuVkV&ZF^n)| zX(X?h(A=$J|1Zg8pa0m8wpax&L4i%>vn2BW#`^dFmoT$+X%(;vTonaa=D2lS$7+86 zrZN{Ma%~s&6jc;~n=30RXky}v&P9aF=Ylu-)Jz>FYmzjG zlHu4UM}r}RTwO%Tz|1;knhYkkAKx`7RZ^wvN_9SO9<*w@dDvdm^t|0Ztm%X1yTziU zUhg-KPi{Va`8xl$`2NEVLP%JwR$dYQgP&mJhWObZC$ULBf)_J(h^7`0)yOS$Bz%wy``-28W^awMDcI$w`J^=vn8fgV=ybocH zCiDn1htL8dT`HhUmGs1rE*<=u;yl94p-UH%9v_mvEa`)PP(tks}5pePuZIb5cIVUJ>n#iO_i aY6bin4M2}Da|j*~z6e+vxL^jJl!3p9V`Xaq literal 0 HcmV?d00001 diff --git a/contracts/token/ERC20/ERC20Snapshot.sol b/contracts/token/ERC20/ERC20Snapshot.sol new file mode 100644 index 00000000000..055ea9bf2d6 --- /dev/null +++ b/contracts/token/ERC20/ERC20Snapshot.sol @@ -0,0 +1,192 @@ +/** + * @title ERC20 Snapshot Token + * inspired by Jordi Baylina's MiniMeToken to record historical balances + * @author Validity Labs AG + */ + +pragma solidity ^0.5.2; + +import "../../math/SafeMath.sol"; +import "./ERC20.sol"; +import "./IERC20Snapshot.sol"; + +contract ERC20Snapshot is ERC20, IERC20Snapshot { + using SafeMath for uint256; + + /** + * @dev `Snapshot` is the structure that attaches a block number to a + * given value. The block number attached is the one that last changed the value + */ + struct Snapshot { + uint128 fromBlock; // `fromBlock` block.number + uint128 value; // `value` is the amount of tokens + } + + /** + * @dev `_snapshotBalances` is the map that tracks the balance of each address, in this + * contract when the balance changes the block number that the change + * occurred is also included in the map + */ + mapping (address => Snapshot[]) private _snapshotBalances; + + // Tracks the history of the `totalSupply` of the token + Snapshot[] private _snapshotTotalSupply; + + /*** FUNCTIONS ***/ + /** OVERRIDE + * @dev Send `value` tokens to `to` from `msg.sender` + * @param to The address of the recipient + * @param value The amount of tokens to be transferred + * @return Whether the transfer was successful or not + */ + function transfer(address to, uint256 value) public returns (bool result) { + result = super.transfer(to, value); + createSnapshot(msg.sender, to); + } + + /** OVERRIDE + * @dev Send `value` tokens to `to` from `from` on the condition it is approved by `from` + * @param from The address holding the tokens being transferred + * @param to The address of the recipient + * @param value The amount of tokens to be transferred + * @return True if the transfer was successful + */ + function transferFrom( + address from, + address to, + uint256 value + ) public returns (bool result) + { + result = super.transferFrom(from, to, value); + createSnapshot(from, to); + } + + /** + * @dev Queries the balance of `owner` AFTER a specific `blockNumber` + * @param owner The address from which the balance will be retrieved + * @param blockNumber The block number when the balance is queried + * @return The balance AFTER `blockNumber` + */ + function balanceOfAt( + address owner, + uint blockNumber) public view returns (uint256) + { + return getValueAt(_snapshotBalances[owner], blockNumber); + } + + /** + * @dev Total amount of tokens AFTER a specific `blockNumber`. + * @param blockNumber The block number when the totalSupply is queried + * @return The total amount of tokens AFTER `blockNumber` + */ + function totalSupplyAt(uint blockNumber) public view returns(uint256) { + return getValueAt(_snapshotTotalSupply, blockNumber); + } + + /*** Internal functions ***/ + /** + * @dev Updates snapshot mappings for from and to and emit an event + * @param from The address holding the tokens being transferred + * @param to The address of the recipient + * @return True if the transfer was successful + */ + function createSnapshot(address from, address to) internal { + updateValueAtNow(_snapshotBalances[from], balanceOf(from)); + updateValueAtNow(_snapshotBalances[to], balanceOf(to)); + } + + /** + * @dev `getValueAt` retrieves the number of tokens at a given block number + * @param checkpoints The history of values being queried + * @param blockNumber The block number to retrieve the value at + * @return The number of tokens being queried + */ + function getValueAt( + Snapshot[] storage checkpoints, + uint blockNumber) internal view returns (uint) + { + if (checkpoints.length == 0) return 0; + + // Shortcut for the actual value + if (blockNumber >= checkpoints[checkpoints.length.sub(1)].fromBlock) { + return checkpoints[checkpoints.length.sub(1)].value; + } + + if (blockNumber < checkpoints[0].fromBlock) { + return 0; + } + + // Binary search of the value in the array + uint min; + uint max = checkpoints.length.sub(1); + + while (max > min) { + uint mid = (max.add(min).add(1)).div(2); + if (checkpoints[mid].fromBlock <= blockNumber) { + min = mid; + } else { + max = mid.sub(1); + } + } + return checkpoints[min].value; + } + + /** + * @dev `updateValueAtNow` used to update the `_snapshotBalances` + * map and the `_snapshotTotalSupply` + * @param checkpoints The history of data being updated + * @param value The new number of tokens + */ + function updateValueAtNow( + Snapshot[] storage checkpoints, + uint value) + internal + { + if ( + (checkpoints.length == 0) || + (checkpoints[checkpoints.length.sub(1)].fromBlock < block.number) + ) { + checkpoints.push(Snapshot(uint128(block.number), uint128(value))); + } else { + checkpoints[checkpoints.length.sub(1)].value = uint128(value); + } + } + + /** OVERRIDE + * @dev Internal function that mints an amount of the token and assigns it to + * an account. This encapsulates the modification of balances such that the + * proper events are emitted. + * @param account The account that will receive the created tokens. + * @param amount The amount that will be created. + */ + function _mint(address account, uint256 amount) internal { + super._mint(account, amount); + updateValueAtNow(_snapshotTotalSupply, totalSupply()); + updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + } + + /** OVERRIDE + * @dev Internal function that burns an amount of the token of a given + * account. + * @param account The account whose tokens will be burnt. + * @param amount The amount that will be burnt. + */ + function _burn(address account, uint256 amount) internal { + super._burn(account, amount); + updateValueAtNow(_snapshotTotalSupply, totalSupply()); + updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + } + + /** OVERRIDE + * @dev Internal function that burns an amount of the token of a given + * account, deducting from the sender's allowance for said account. Uses the + * internal burn function. + * @param account The account whose tokens will be burnt. + * @param amount The amount that will be burnt. + */ + function _burnFrom(address account, uint256 amount) internal { + super._burnFrom(account, amount); + updateValueAtNow(_snapshotTotalSupply, totalSupply()); + updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + } +} diff --git a/contracts/token/ERC20/IERC20Snapshot.sol b/contracts/token/ERC20/IERC20Snapshot.sol new file mode 100644 index 00000000000..d33608131cd --- /dev/null +++ b/contracts/token/ERC20/IERC20Snapshot.sol @@ -0,0 +1,38 @@ +/** + * @title Interface ERC20 SnapshotToken (abstract contract) + * @author Validity Labs AG + */ + +pragma solidity ^0.5.2; + +contract IERC20Snapshot { + /** + * @dev Queries the balance of `owner` AFTER a specific `blockNumber` has been appended + * @param owner The address from which the balance will be retrieved + * @param blockNumber The block number when the balance is queried + * @return The balance AFTER `blockNumber` + */ + function balanceOfAt( + address owner, + uint blockNumber + ) + public + view + returns (uint256) + { + // solhint-disable-previous-line no-empty-blocks + } + + /** + * @notice Total amount of tokens AFTER a specific `blockNumber`. + * @param blockNumber The block number when the totalSupply is queried + * @return The total amount of tokens AFTER `blockNumber` + */ + function totalSupplyAt(uint blockNumber) + public + view + returns(uint256) + { + // solhint-disable-previous-line no-empty-blocks + } +} diff --git a/test/.DS_Store b/test/.DS_Store new file mode 100644 index 0000000000000000000000000000000000000000..55a580d3f4321776bbe78d1846f739041e9ddeac GIT binary patch literal 6148 zcmeHK-EPw`82#M!CoN1A32D2`4H6d>+SCa;A*8BoLcKvqo!|n{mb77wNRz5bS4t`B z4etQF0gu8H@E|+@oX_@9l5Wzj5CVUbeH`Z;+uvDYH$)^l)4?uLoro+H#$pZC1;O{Z ztVKch+yn|aMoe)xi2802xod3GVH_|H{A~{KyIUrQ`uOuG`~LE#@Brn`PZ@IQRdT@_ zLUBeuMKsC0@vQi|rs#te(ToNd-=ToK)E)ta*vcucV=WV!)0h(IPSJMI9@0Fg`{po0LAsSzRxyW<3_N%+N4eOow4#U{9E?89jx5-nG_NZE2ccR&vhiu0Q?N&AMFlH& zu!<2h$R^8{4yD;OI-*1Bq3+TXdQ5kr8)P;7Gzlx^Qwi&i=napbW8x{gjOoteu|8qG zx#Pf(lbxOKqOegcl`EE2vuc~QSG{30>m^PyjXTcd1z$aNlA){HM^O~~ZaeNX-_zY_i0>`9`8ye5y3mPdi&U%wDh{99!vZ6#&`S=9+ z$CO{4j7{g`T?zGKtZP?d8Yix~e zjVpz?gAhszR8pZoF@%z%-`2dg#+5=PC!s$+gq~UGFBBnX$N09SlV~e6wQ;~Wkab`~ zUDo;hKfL_=KPxg<#sTBNKjnZZ9`p`6NJ*cqYsv9hYonZ?a4>JBP)bng<5)KMDBebq bfqOPLfNhN{h3G+;9|F<_QyB;Tr~|(MBQ6+= literal 0 HcmV?d00001 diff --git a/test/token/.DS_Store b/test/token/.DS_Store new file mode 100644 index 0000000000000000000000000000000000000000..692c78dd610b750c67c9c9c213b8c3eee7287acb GIT binary patch literal 6148 zcmeHK&1xGl5SAP#m0d!82-HVi0zLR(*P(U@fyFy}v&P9aF=Ylu-)Jz>FYmzjG zlHu4UM}r}RTwO%Tz|1;knhYkkAKx`7RZ^wvN_9SO9<*w@dDvdm^t|0Ztm%X1yTziU zUhg-KPi{Va`8xl$`2NEVLP%JwR$dYQgP&mJhWObZC$ULBf)_J(h^7`0)yOS$Bz%wy``-28W^awMDcI$w`J^=vn8fgV=ybocH zCiDn1htL8dT`HhUmGs1rE*<=u;yl94p-UH%9v_mvEa`)PP(tks}5pePuZIb5cIVUJ>n#iO_i aY6bin4M2}Da|j*~z6e+vxL^jJl!3p9V`Xaq literal 0 HcmV?d00001 diff --git a/test/token/ERC20/ERC20Snapshot.test.js b/test/token/ERC20/ERC20Snapshot.test.js new file mode 100644 index 00000000000..537226731d3 --- /dev/null +++ b/test/token/ERC20/ERC20Snapshot.test.js @@ -0,0 +1,634 @@ +const { BN, shouldFail, constants, expectEvent } = require('openzeppelin-test-helpers'); +const { ZERO_ADDRESS } = constants; + +const ERC20SnapshotMock = artifacts.require('ERC20SnapshotMock'); + +contract('ERC20Snapshot', function ([_, owner, recipient, anotherAccount]) { + const initialSupply = new BN(100); + + beforeEach(async function () { + this.token = await ERC20SnapshotMock.new(owner, initialSupply); + }); + + describe('total supply', function () { + let blockNum; + + it('returns the total amount of tokens', async function () { + (await this.token.totalSupply()).should.be.bignumber.equal(initialSupply); + }); + + it('returns the total amount of tokens via snapshot', async function () { + blockNum = await web3.eth.getBlockNumber(); + (await this.token.totalSupplyAt(blockNum)).should.be.bignumber.equal(initialSupply); + }); + + it('verifies balances of accounts via snapshot', async function () { + blockNum = await web3.eth.getBlockNumber(); + (await this.token.balanceOfAt(recipient, blockNum)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anotherAccount, blockNum)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply); + }); + }); + + describe('balanceOf', function () { + describe('when the requested account has no tokens', function () { + it('returns zero', async function () { + (await this.token.balanceOf(anotherAccount)).should.be.bignumber.equal('0'); + }); + }); + + describe('when the requested account has some tokens', function () { + it('returns the total amount of tokens', async function () { + (await this.token.balanceOf(owner)).should.be.bignumber.equal(initialSupply); + }); + }); + }); + + describe('transfer', function () { + describe('when the recipient is not the zero address', function () { + const to = recipient; + + describe('when the sender does not have enough balance', function () { + const amount = new BN('101'); + + it('reverts', async function () { + await shouldFail.reverting(this.token.transfer(to, amount, { from: owner })); + }); + }); + + describe('when the sender has enough balance', function () { + const amount = new BN('100'); + + it('transfers the requested amount', async function () { + await this.token.transfer(to, amount, { from: owner }); + + (await this.token.balanceOf(owner)).should.be.bignumber.equal('0'); + + (await this.token.balanceOf(to)).should.be.bignumber.equal(amount); + }); + + it('verifies snapshot history', async function () { + await this.token.transfer(to, amount, { from: owner }); + + const blockNum = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); + + (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal(amount); + (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); + }); + + it('emits a transfer event', async function () { + const { logs } = await this.token.transfer(to, amount, { from: owner }); + + expectEvent.inLogs(logs, 'Transfer', { + from: owner, + to: to, + value: amount, + }); + }); + }); + + describe('multiple transfers', function () { + const amount = new BN('100'); + + it('transfers the requested amounts and verifies history', async function () { + await this.token.transfer(to, (amount.divn(2)), { from: owner }); + const blockNum = await web3.eth.getBlockNumber(); + await this.token.transfer(anotherAccount, (amount.divn(4)), { from: owner }); + const blockNum2 = await web3.eth.getBlockNumber(); + await this.token.transfer(anotherAccount, (amount.divn(4)), { from: to }); + const blockNum3 = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(owner, blockNum3)).should.be.bignumber.equal((amount.divn(4))); + (await this.token.balanceOfAt(owner, blockNum2)).should.be.bignumber.equal((amount.divn(4))); + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal((amount.divn(2))); + (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); + + (await this.token.balanceOfAt(to, blockNum3)).should.be.bignumber.equal((amount.divn(4))); + (await this.token.balanceOfAt(to, blockNum2)).should.be.bignumber.equal((amount.divn(2))); + (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal((amount.divn(2))); + (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); + + (await this.token.balanceOfAt(anotherAccount, blockNum3)).should.be.bignumber.equal((amount.divn(2))); + (await this.token.balanceOfAt(anotherAccount, blockNum2)).should.be.bignumber.equal((amount.divn(4))); + (await this.token.balanceOfAt(anotherAccount, blockNum)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anotherAccount, blockNum - 1)).should.be.bignumber.equal('0'); + + (await this.token.totalSupplyAt(blockNum3)).should.be.bignumber.equal(initialSupply); + (await this.token.totalSupplyAt(blockNum2)).should.be.bignumber.equal(initialSupply); + (await this.token.totalSupplyAt(blockNum)).should.be.bignumber.equal(initialSupply); + (await this.token.totalSupplyAt(blockNum - 1)).should.be.bignumber.equal(initialSupply); + }); + }); + }); + + describe('when the recipient is the zero address', function () { + const to = ZERO_ADDRESS; + + it('reverts', async function () { + await shouldFail.reverting(this.token.transfer(to, 100, { from: owner })); + }); + }); + }); + + describe('approve', function () { + describe('when the spender is not the zero address', function () { + const spender = recipient; + + describe('when the sender has enough balance', function () { + const amount = new BN('100'); + + it('emits an approval event', async function () { + const { logs } = await this.token.approve(spender, amount, { from: owner }); + + expectEvent.inLogs(logs, 'Approval', { + owner: owner, + spender: spender, + value: amount, + }); + }); + + describe('when there was no approved amount before', function () { + it('approves the requested amount', async function () { + await this.token.approve(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + + describe('when the spender had an approved amount', function () { + beforeEach(async function () { + await this.token.approve(spender, 1, { from: owner }); + }); + + it('approves the requested amount and replaces the previous one', async function () { + await this.token.approve(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + }); + + describe('when the sender does not have enough balance', function () { + const amount = new BN('101'); + + it('emits an approval event', async function () { + const { logs } = await this.token.approve(spender, amount, { from: owner }); + + expectEvent.inLogs(logs, 'Approval', { + owner: owner, + spender: spender, + value: amount, + }); + }); + + describe('when there was no approved amount before', function () { + it('approves the requested amount', async function () { + await this.token.approve(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + + describe('when the spender had an approved amount', function () { + beforeEach(async function () { + await this.token.approve(spender, 1, { from: owner }); + }); + + it('approves the requested amount and replaces the previous one', async function () { + await this.token.approve(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + }); + }); + + describe('when the spender is the zero address', function () { + const amount = new BN('100'); + const spender = ZERO_ADDRESS; + + it('reverts', async function () { + await shouldFail.reverting(this.token.approve(spender, amount, { from: owner })); + }); + }); + }); + + describe('transfer from', function () { + const spender = recipient; + + describe('when the recipient is not the zero address', function () { + const to = anotherAccount; + + describe('when the spender has enough approved balance', function () { + beforeEach(async function () { + await this.token.approve(spender, 100, { from: owner }); + }); + + describe('when the owner has enough balance', function () { + const amount = new BN('100'); + + it('transfers the requested amount', async function () { + await this.token.transferFrom(owner, to, amount, { from: spender }); + + (await this.token.balanceOf(owner)).should.be.bignumber.equal('0'); + + (await this.token.balanceOf(to)).should.be.bignumber.equal(amount); + }); + + it('decreases the spender allowance', async function () { + await this.token.transferFrom(owner, to, amount, { from: spender }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal('0'); + }); + + it('verifies snapshot history', async function () { + await this.token.transferFrom(owner, to, amount, { from: spender }); + + const blockNum = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); + + (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal(amount); + (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); + }); + + it('emits a transfer event', async function () { + const { logs } = await this.token.transferFrom(owner, to, amount, { from: spender }); + + expectEvent.inLogs(logs, 'Transfer', { + from: owner, + to: to, + value: amount, + }); + }); + }); + + describe('when the owner does not have enough balance', function () { + const amount = new BN('101'); + + it('reverts', async function () { + await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); + }); + }); + }); + + describe('when the spender does not have enough approved balance', function () { + beforeEach(async function () { + await this.token.approve(spender, 99, { from: owner }); + }); + + describe('when the owner has enough balance', function () { + const amount = new BN('100'); + + it('reverts', async function () { + await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); + }); + }); + + describe('when the owner does not have enough balance', function () { + const amount = new BN('101'); + + it('reverts', async function () { + await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); + }); + }); + }); + }); + + describe('when the recipient is the zero address', function () { + const amount = new BN('100'); + const to = ZERO_ADDRESS; + + beforeEach(async function () { + await this.token.approve(spender, amount, { from: owner }); + }); + + it('reverts', async function () { + await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); + }); + }); + }); + + describe('decrease allowance', function () { + describe('when the spender is not the zero address', function () { + const spender = recipient; + + function shouldDecreaseApproval (amount) { + describe('when there was no approved amount before', function () { + it('reverts', async function () { + await shouldFail.reverting(this.token.decreaseAllowance(spender, amount, { from: owner })); + }); + }); + + describe('when the spender had an approved amount', function () { + const approvedAmount = amount; + + beforeEach(async function () { + ({ logs: this.logs } = await this.token.approve(spender, approvedAmount, { from: owner })); + }); + + it('emits an approval event', async function () { + const { logs } = await this.token.decreaseAllowance(spender, approvedAmount, { from: owner }); + + expectEvent.inLogs(logs, 'Approval', { + owner: owner, + spender: spender, + value: '0', + }); + }); + + it('decreases the spender allowance subtracting the requested amount', async function () { + await this.token.decreaseAllowance(spender, approvedAmount - 1, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal('1'); + }); + + it('sets the allowance to zero when all allowance is removed', async function () { + await this.token.decreaseAllowance(spender, approvedAmount, { from: owner }); + (await this.token.allowance(owner, spender)).should.be.bignumber.equal('0'); + }); + + it('reverts when more than the full allowance is removed', async function () { + await shouldFail.reverting(this.token.decreaseAllowance(spender, approvedAmount + 1, { from: owner })); + }); + }); + } + + describe('when the sender has enough balance', function () { + const amount = new BN('100'); + + shouldDecreaseApproval(amount); + }); + + describe('when the sender does not have enough balance', function () { + const amount = new BN('101'); + + shouldDecreaseApproval(amount); + }); + }); + + describe('when the spender is the zero address', function () { + const amount = new BN('100'); + const spender = ZERO_ADDRESS; + + it('reverts', async function () { + await shouldFail.reverting(this.token.decreaseAllowance(spender, amount, { from: owner })); + }); + }); + }); + + describe('increase allowance', function () { + const amount = new BN('100'); + + describe('when the spender is not the zero address', function () { + const spender = recipient; + + describe('when the sender has enough balance', function () { + it('emits an approval event', async function () { + const { logs } = await this.token.increaseAllowance(spender, amount, { from: owner }); + + expectEvent.inLogs(logs, 'Approval', { + owner: owner, + spender: spender, + value: amount, + }); + }); + + describe('when there was no approved amount before', function () { + it('approves the requested amount', async function () { + await this.token.increaseAllowance(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + + describe('when the spender had an approved amount', function () { + beforeEach(async function () { + await this.token.approve(spender, 1, { from: owner }); + }); + + it('increases the spender allowance adding the requested amount', async function () { + await this.token.increaseAllowance(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount.addn(1)); + }); + }); + }); + + describe('when the sender does not have enough balance', function () { + const amount = new BN('101'); + + it('emits an approval event', async function () { + const { logs } = await this.token.increaseAllowance(spender, amount, { from: owner }); + + expectEvent.inLogs(logs, 'Approval', { + owner: owner, + spender: spender, + value: amount, + }); + }); + + describe('when there was no approved amount before', function () { + it('approves the requested amount', async function () { + await this.token.increaseAllowance(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + }); + }); + + describe('when the spender had an approved amount', function () { + beforeEach(async function () { + await this.token.approve(spender, 1, { from: owner }); + }); + + it('increases the spender allowance adding the requested amount', async function () { + await this.token.increaseAllowance(spender, amount, { from: owner }); + + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount.addn(1)); + }); + }); + }); + }); + + describe('when the spender is the zero address', function () { + const spender = ZERO_ADDRESS; + + it('reverts', async function () { + await shouldFail.reverting(this.token.increaseAllowance(spender, amount, { from: owner })); + }); + }); + }); + + describe('_mint', function () { + const initialSupply = new BN('100'); + const amount = new BN('50'); + + it('rejects a zero account', async function () { + await shouldFail.reverting(this.token.mint(ZERO_ADDRESS, amount)); + }); + + describe('for a non zero account', function () { + beforeEach('minting', async function () { + const { logs } = await this.token.mint(recipient, amount); + this.blockNum = await web3.eth.getBlockNumber(); + this.logs = logs; + }); + + it('increments totalSupply', async function () { + const expectedSupply = initialSupply.add(amount); + (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); + }); + + it('increments totalSupply - verify snapshots', async function () { + const expectedSupply = initialSupply.add(amount); + + (await this.token.totalSupplyAt(this.blockNum)).should.be.bignumber.equal(expectedSupply); + (await this.token.totalSupplyAt(this.blockNum - 1)).should.be.bignumber.equal(initialSupply); + }); + + it('increments recipient balance', async function () { + (await this.token.balanceOf(recipient)).should.be.bignumber.equal(amount); + }); + + it('verifies snapshot history', async function () { + const blockNum = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(recipient, blockNum)).should.be.bignumber.equal(amount); + (await this.token.balanceOfAt(recipient, blockNum - 1)).should.be.bignumber.equal('0'); + }); + + it('emits Transfer event', async function () { + const event = expectEvent.inLogs(this.logs, 'Transfer', { + from: ZERO_ADDRESS, + to: recipient, + }); + + event.args.value.should.be.bignumber.equal(amount); + }); + }); + }); + + describe('_burn', function () { + const initialSupply = new BN('100'); + + it('rejects a zero account', async function () { + await shouldFail.reverting(this.token.burn(ZERO_ADDRESS, 1)); + }); + + describe('for a non zero account', function () { + it('rejects burning more than balance', async function () { + await shouldFail.reverting(this.token.burn(owner, initialSupply.addn(1))); + }); + + const describeBurn = function (description, amount) { + describe(description, function () { + beforeEach('burning', async function () { + const { logs } = await this.token.burn(owner, amount); + this.logs = logs; + }); + + it('decrements totalSupply', async function () { + const expectedSupply = initialSupply.sub(amount); + (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); + }); + + it('decrements owner balance', async function () { + const expectedBalance = initialSupply.sub(amount); + (await this.token.balanceOf(owner)).should.be.bignumber.equal(expectedBalance); + }); + + it('verifies snapshot history', async function () { + const blockNum = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply.sub(amount)); + (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(initialSupply); + }); + + it('emits Transfer event', async function () { + const event = expectEvent.inLogs(this.logs, 'Transfer', { + from: owner, + to: ZERO_ADDRESS, + }); + + event.args.value.should.be.bignumber.equal(amount); + }); + }); + }; + + describeBurn('for entire balance', initialSupply); + describeBurn('for less amount than balance', initialSupply.subn(1)); + }); + }); + + describe('_burnFrom', function () { + const initialSupply = new BN('100'); + const allowance = new BN('70'); + + const spender = anotherAccount; + + beforeEach('approving', async function () { + await this.token.approve(spender, allowance, { from: owner }); + }); + + it('rejects a null account', async function () { + await shouldFail.reverting(this.token.burnFrom(ZERO_ADDRESS, 1)); + }); + + describe('for a non null account', function () { + it('rejects burning more than allowance', async function () { + await shouldFail.reverting(this.token.burnFrom(owner, allowance.addn(1))); + }); + + it('rejects burning more than balance', async function () { + await shouldFail.reverting(this.token.burnFrom(owner, initialSupply.addn(1))); + }); + + const describeBurnFrom = function (description, amount) { + describe(description, function () { + beforeEach('burning', async function () { + const { logs } = await this.token.burnFrom(owner, amount, { from: spender }); + this.logs = logs; + }); + + it('decrements totalSupply', async function () { + const expectedSupply = initialSupply.sub(amount); + (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); + }); + + it('decrements owner balance', async function () { + const expectedBalance = initialSupply.sub(amount); + (await this.token.balanceOf(owner)).should.be.bignumber.equal(expectedBalance); + }); + + it('decrements spender allowance', async function () { + const expectedAllowance = allowance.sub(amount); + (await this.token.allowance(owner, spender)).should.be.bignumber.equal(expectedAllowance); + }); + + it('verifies snapshot history', async function () { + const blockNum = await web3.eth.getBlockNumber(); + + (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply.sub(amount)); + (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(initialSupply); + }); + + it('emits Transfer event', async function () { + const event = expectEvent.inLogs(this.logs, 'Transfer', { + from: owner, + to: ZERO_ADDRESS, + }); + + event.args.value.should.be.bignumber.equal(amount); + }); + }); + }; + + describeBurnFrom('for entire allowance', allowance); + describeBurnFrom('for less amount than allowance', allowance.subn(1)); + }); + }); +}); diff --git a/yarn.lock b/yarn.lock new file mode 100644 index 00000000000..6f0bfd683d9 --- /dev/null +++ b/yarn.lock @@ -0,0 +1,2938 @@ +# THIS IS AN AUTOGENERATED FILE. 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set-blocking "^2.0.0" + string-width "^2.0.0" + which-module "^2.0.0" + y18n "^3.2.1" + yargs-parser "^9.0.2" + +yargs@^4.6.0: + version "4.8.1" + resolved "https://registry.yarnpkg.com/yargs/-/yargs-4.8.1.tgz#c0c42924ca4aaa6b0e6da1739dfb216439f9ddc0" + integrity sha1-wMQpJMpKqmsObaFznfshZDn53cA= + dependencies: + cliui "^3.2.0" + decamelize "^1.1.1" + get-caller-file "^1.0.1" + lodash.assign "^4.0.3" + os-locale "^1.4.0" + read-pkg-up "^1.0.1" + require-directory "^2.1.1" + require-main-filename "^1.0.1" + set-blocking "^2.0.0" + string-width "^1.0.1" + which-module "^1.0.0" + window-size "^0.2.0" + y18n "^3.2.1" + yargs-parser "^2.4.1" From e85ed5caef2c86783195374d4c2992446d3b5a2a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Tue, 22 Jan 2019 17:16:24 -0300 Subject: [PATCH 02/12] Refactor ERC20Snapshot to use on-demand snapshots. --- contracts/mocks/ERC20SnapshotMock.sol | 5 - contracts/token/ERC20/ERC20Snapshot.sol | 253 ++++----- contracts/token/ERC20/IERC20Snapshot.sol | 38 -- test/token/ERC20/ERC20Snapshot.test.js | 675 ++++------------------- 4 files changed, 214 insertions(+), 757 deletions(-) delete mode 100644 contracts/token/ERC20/IERC20Snapshot.sol diff --git a/contracts/mocks/ERC20SnapshotMock.sol b/contracts/mocks/ERC20SnapshotMock.sol index 2d70aa5b8c2..e460e070457 100644 --- a/contracts/mocks/ERC20SnapshotMock.sol +++ b/contracts/mocks/ERC20SnapshotMock.sol @@ -3,7 +3,6 @@ pragma solidity ^0.5.2; import "../token/ERC20/ERC20Snapshot.sol"; -// mock class using ERC20Snapshot contract ERC20SnapshotMock is ERC20Snapshot { constructor(address initialAccount, uint256 initialBalance) public { _mint(initialAccount, initialBalance); @@ -16,8 +15,4 @@ contract ERC20SnapshotMock is ERC20Snapshot { function burn(address account, uint256 amount) public { _burn(account, amount); } - - function burnFrom(address account, uint256 amount) public { - _burnFrom(account, amount); - } } diff --git a/contracts/token/ERC20/ERC20Snapshot.sol b/contracts/token/ERC20/ERC20Snapshot.sol index 055ea9bf2d6..d2b00b32a3e 100644 --- a/contracts/token/ERC20/ERC20Snapshot.sol +++ b/contracts/token/ERC20/ERC20Snapshot.sol @@ -1,192 +1,129 @@ +pragma solidity ^0.5.2; + +import "../../math/SafeMath.sol"; +import "../../utils/Arrays.sol"; +import "./ERC20.sol"; + /** - * @title ERC20 Snapshot Token + * @title ERC20 token with snapshots. * inspired by Jordi Baylina's MiniMeToken to record historical balances * @author Validity Labs AG */ +contract ERC20Snapshot is ERC20 { + using SafeMath for uint256; + using Arrays for uint256[]; -pragma solidity ^0.5.2; + // Snapshots store a value at the time a snapshot is taken (and a new snapshot id created), and the corresponding + // snapshot id. Each account has individual snapshots taken on demand, as does the token's total supply. -import "../../math/SafeMath.sol"; -import "./ERC20.sol"; -import "./IERC20Snapshot.sol"; + // These two fields (value and id) belong together, but are not part of a struct so that functions that work on + // arrays can be called on them. -contract ERC20Snapshot is ERC20, IERC20Snapshot { - using SafeMath for uint256; + mapping (address => uint256[]) private _accountSnapshotIds; + mapping (address => uint256[]) private _accountSnapshotValues; - /** - * @dev `Snapshot` is the structure that attaches a block number to a - * given value. The block number attached is the one that last changed the value - */ - struct Snapshot { - uint128 fromBlock; // `fromBlock` block.number - uint128 value; // `value` is the amount of tokens - } + uint256[] private _totalSupplySnapshotIds; + uint256[] private _totalSupplySnapshotValues; - /** - * @dev `_snapshotBalances` is the map that tracks the balance of each address, in this - * contract when the balance changes the block number that the change - * occurred is also included in the map - */ - mapping (address => Snapshot[]) private _snapshotBalances; - - // Tracks the history of the `totalSupply` of the token - Snapshot[] private _snapshotTotalSupply; - - /*** FUNCTIONS ***/ - /** OVERRIDE - * @dev Send `value` tokens to `to` from `msg.sender` - * @param to The address of the recipient - * @param value The amount of tokens to be transferred - * @return Whether the transfer was successful or not - */ - function transfer(address to, uint256 value) public returns (bool result) { - result = super.transfer(to, value); - createSnapshot(msg.sender, to); - } + // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid. + uint256 private _currentSnapshotId; - /** OVERRIDE - * @dev Send `value` tokens to `to` from `from` on the condition it is approved by `from` - * @param from The address holding the tokens being transferred - * @param to The address of the recipient - * @param value The amount of tokens to be transferred - * @return True if the transfer was successful - */ - function transferFrom( - address from, - address to, - uint256 value - ) public returns (bool result) - { - result = super.transferFrom(from, to, value); - createSnapshot(from, to); + event Snapshot(uint256 id); + + // Creates a new snapshot id. Balances are only stored in snapshots on demand: unless a snapshot was taken, a + // balance change will not be recorded. This means the extra added cost of storing snapshotted balances is only paid + // when required, but is also flexible enough that it allows for e.g. daily snapshots. + function snapshot() public returns (uint256) { + _currentSnapshotId += 1; + emit Snapshot(_currentSnapshotId); + return _currentSnapshotId; } - /** - * @dev Queries the balance of `owner` AFTER a specific `blockNumber` - * @param owner The address from which the balance will be retrieved - * @param blockNumber The block number when the balance is queried - * @return The balance AFTER `blockNumber` - */ - function balanceOfAt( - address owner, - uint blockNumber) public view returns (uint256) - { - return getValueAt(_snapshotBalances[owner], blockNumber); + function balanceOfAt(address account, uint256 snapshotId) public view returns (uint256) { + (bool snapshotted, uint256 value) = + _valueAt(snapshotId, _accountSnapshotValues[account], _accountSnapshotIds[account]); + + return snapshotted ? value : balanceOf(account); } - /** - * @dev Total amount of tokens AFTER a specific `blockNumber`. - * @param blockNumber The block number when the totalSupply is queried - * @return The total amount of tokens AFTER `blockNumber` - */ - function totalSupplyAt(uint blockNumber) public view returns(uint256) { - return getValueAt(_snapshotTotalSupply, blockNumber); + function totalSupplyAt(uint256 snapshotId) public view returns(uint256) { + (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshotValues, _totalSupplySnapshotIds); + + return snapshotted ? value : totalSupply(); } - /*** Internal functions ***/ - /** - * @dev Updates snapshot mappings for from and to and emit an event - * @param from The address holding the tokens being transferred - * @param to The address of the recipient - * @return True if the transfer was successful - */ - function createSnapshot(address from, address to) internal { - updateValueAtNow(_snapshotBalances[from], balanceOf(from)); - updateValueAtNow(_snapshotBalances[to], balanceOf(to)); + // _transfer, _mint and _burn are the only functions where the balances are modified, so it is there that the + // snapshots are updated. Note that the update happens _before_ the balance change, with the pre-modified value. + // The same is true for the total supply and _mint and _burn. + function _transfer(address from, address to, uint256 value) internal { + _updateAccountSnapshot(from); + _updateAccountSnapshot(to); + + super._transfer(from, to, value); } - /** - * @dev `getValueAt` retrieves the number of tokens at a given block number - * @param checkpoints The history of values being queried - * @param blockNumber The block number to retrieve the value at - * @return The number of tokens being queried - */ - function getValueAt( - Snapshot[] storage checkpoints, - uint blockNumber) internal view returns (uint) - { - if (checkpoints.length == 0) return 0; + function _mint(address account, uint256 value) internal { + _updateAccountSnapshot(account); + _updateTotalSupplySnapshot(); - // Shortcut for the actual value - if (blockNumber >= checkpoints[checkpoints.length.sub(1)].fromBlock) { - return checkpoints[checkpoints.length.sub(1)].value; - } + super._mint(account, value); + } - if (blockNumber < checkpoints[0].fromBlock) { - return 0; - } + function _burn(address account, uint256 value) internal { + _updateAccountSnapshot(account); + _updateTotalSupplySnapshot(); - // Binary search of the value in the array - uint min; - uint max = checkpoints.length.sub(1); - - while (max > min) { - uint mid = (max.add(min).add(1)).div(2); - if (checkpoints[mid].fromBlock <= blockNumber) { - min = mid; - } else { - max = mid.sub(1); - } - } - return checkpoints[min].value; + super._burn(account, value); } - /** - * @dev `updateValueAtNow` used to update the `_snapshotBalances` - * map and the `_snapshotTotalSupply` - * @param checkpoints The history of data being updated - * @param value The new number of tokens - */ - function updateValueAtNow( - Snapshot[] storage checkpoints, - uint value) - internal + // 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 + // created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds + // to this id is the current one. + // b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the + // requested id, and its value is the one to return. + // c) More snapshots were created after the requested one, and the queried value was later modified. There will be + // no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is + // larger than the requested one. + // + // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if + // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does + // exactly this. + function _valueAt(uint256 snapshotId, uint256[] storage values, uint256[] storage ids) + private view returns (bool, uint256) { - if ( - (checkpoints.length == 0) || - (checkpoints[checkpoints.length.sub(1)].fromBlock < block.number) - ) { - checkpoints.push(Snapshot(uint128(block.number), uint128(value))); + require(snapshotId > 0); + require(snapshotId <= _currentSnapshotId); + + uint256 index = ids.findUpperBound(snapshotId); + + if (index == ids.length) { + return (false, 0); } else { - checkpoints[checkpoints.length.sub(1)].value = uint128(value); + return (true, values[index]); } } - /** OVERRIDE - * @dev Internal function that mints an amount of the token and assigns it to - * an account. This encapsulates the modification of balances such that the - * proper events are emitted. - * @param account The account that will receive the created tokens. - * @param amount The amount that will be created. - */ - function _mint(address account, uint256 amount) internal { - super._mint(account, amount); - updateValueAtNow(_snapshotTotalSupply, totalSupply()); - updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + function _updateAccountSnapshot(address account) private { + _updateSnapshot(_accountSnapshotValues[account], _accountSnapshotIds[account], balanceOf(account)); + } + + function _updateTotalSupplySnapshot() private { + _updateSnapshot(_totalSupplySnapshotValues, _totalSupplySnapshotIds, totalSupply()); } - /** OVERRIDE - * @dev Internal function that burns an amount of the token of a given - * account. - * @param account The account whose tokens will be burnt. - * @param amount The amount that will be burnt. - */ - function _burn(address account, uint256 amount) internal { - super._burn(account, amount); - updateValueAtNow(_snapshotTotalSupply, totalSupply()); - updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + function _updateSnapshot(uint256[] storage values, uint256[] storage ids, uint256 currentValue) private { + if (_lastSnapshotId(ids) < _currentSnapshotId) { + ids.push(_currentSnapshotId); + values.push(currentValue); + } } - /** OVERRIDE - * @dev Internal function that burns an amount of the token of a given - * account, deducting from the sender's allowance for said account. Uses the - * internal burn function. - * @param account The account whose tokens will be burnt. - * @param amount The amount that will be burnt. - */ - function _burnFrom(address account, uint256 amount) internal { - super._burnFrom(account, amount); - updateValueAtNow(_snapshotTotalSupply, totalSupply()); - updateValueAtNow(_snapshotBalances[account], balanceOf(account)); + function _lastSnapshotId(uint256[] storage ids) private view returns (uint256) { + if (ids.length == 0) { + return 0; + } else { + return ids[ids.length - 1]; + } } } diff --git a/contracts/token/ERC20/IERC20Snapshot.sol b/contracts/token/ERC20/IERC20Snapshot.sol deleted file mode 100644 index d33608131cd..00000000000 --- a/contracts/token/ERC20/IERC20Snapshot.sol +++ /dev/null @@ -1,38 +0,0 @@ -/** - * @title Interface ERC20 SnapshotToken (abstract contract) - * @author Validity Labs AG - */ - -pragma solidity ^0.5.2; - -contract IERC20Snapshot { - /** - * @dev Queries the balance of `owner` AFTER a specific `blockNumber` has been appended - * @param owner The address from which the balance will be retrieved - * @param blockNumber The block number when the balance is queried - * @return The balance AFTER `blockNumber` - */ - function balanceOfAt( - address owner, - uint blockNumber - ) - public - view - returns (uint256) - { - // solhint-disable-previous-line no-empty-blocks - } - - /** - * @notice Total amount of tokens AFTER a specific `blockNumber`. - * @param blockNumber The block number when the totalSupply is queried - * @return The total amount of tokens AFTER `blockNumber` - */ - function totalSupplyAt(uint blockNumber) - public - view - returns(uint256) - { - // solhint-disable-previous-line no-empty-blocks - } -} diff --git a/test/token/ERC20/ERC20Snapshot.test.js b/test/token/ERC20/ERC20Snapshot.test.js index 537226731d3..8162a5bc613 100644 --- a/test/token/ERC20/ERC20Snapshot.test.js +++ b/test/token/ERC20/ERC20Snapshot.test.js @@ -1,634 +1,197 @@ -const { BN, shouldFail, constants, expectEvent } = require('openzeppelin-test-helpers'); -const { ZERO_ADDRESS } = constants; - +const { BN, expectEvent, shouldFail } = require('openzeppelin-test-helpers'); const ERC20SnapshotMock = artifacts.require('ERC20SnapshotMock'); -contract('ERC20Snapshot', function ([_, owner, recipient, anotherAccount]) { +contract('ERC20Snapshot', function ([_, initialHolder, recipient, anyone]) { const initialSupply = new BN(100); beforeEach(async function () { - this.token = await ERC20SnapshotMock.new(owner, initialSupply); + this.token = await ERC20SnapshotMock.new(initialHolder, initialSupply); }); - describe('total supply', function () { - let blockNum; - - it('returns the total amount of tokens', async function () { - (await this.token.totalSupply()).should.be.bignumber.equal(initialSupply); - }); - - it('returns the total amount of tokens via snapshot', async function () { - blockNum = await web3.eth.getBlockNumber(); - (await this.token.totalSupplyAt(blockNum)).should.be.bignumber.equal(initialSupply); + describe('snapshot', function () { + it('emits a snapshot event', async function () { + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot'); }); - it('verifies balances of accounts via snapshot', async function () { - blockNum = await web3.eth.getBlockNumber(); - (await this.token.balanceOfAt(recipient, blockNum)).should.be.bignumber.equal('0'); - (await this.token.balanceOfAt(anotherAccount, blockNum)).should.be.bignumber.equal('0'); - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply); + it('creates increasing snapshots ids, starting from 1', async function () { + for (const id of ['1', '2', '3', '4', '5']) { + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id }); + } }); }); - describe('balanceOf', function () { - describe('when the requested account has no tokens', function () { - it('returns zero', async function () { - (await this.token.balanceOf(anotherAccount)).should.be.bignumber.equal('0'); - }); + describe('totalSupplyAt', function () { + it('reverts with a snapshot id of 0', async function () { + await shouldFail.reverting(this.token.totalSupplyAt(0)); }); - describe('when the requested account has some tokens', function () { - it('returns the total amount of tokens', async function () { - (await this.token.balanceOf(owner)).should.be.bignumber.equal(initialSupply); - }); + it('reverts with a not-yet-created snapshot id', async function () { + await shouldFail.reverting(this.token.totalSupplyAt(1)); }); - }); - - describe('transfer', function () { - describe('when the recipient is not the zero address', function () { - const to = recipient; - - describe('when the sender does not have enough balance', function () { - const amount = new BN('101'); - - it('reverts', async function () { - await shouldFail.reverting(this.token.transfer(to, amount, { from: owner })); - }); - }); - - describe('when the sender has enough balance', function () { - const amount = new BN('100'); - it('transfers the requested amount', async function () { - await this.token.transfer(to, amount, { from: owner }); - - (await this.token.balanceOf(owner)).should.be.bignumber.equal('0'); - - (await this.token.balanceOf(to)).should.be.bignumber.equal(amount); - }); - - it('verifies snapshot history', async function () { - await this.token.transfer(to, amount, { from: owner }); - - const blockNum = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal('0'); - (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); - - (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal(amount); - (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); - }); - - it('emits a transfer event', async function () { - const { logs } = await this.token.transfer(to, amount, { from: owner }); + context('with initial snapshot', function () { + beforeEach(async function () { + this.initialSnapshotId = new BN('1'); - expectEvent.inLogs(logs, 'Transfer', { - from: owner, - to: to, - value: amount, - }); - }); + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id: this.initialSnapshotId }); }); - describe('multiple transfers', function () { - const amount = new BN('100'); - - it('transfers the requested amounts and verifies history', async function () { - await this.token.transfer(to, (amount.divn(2)), { from: owner }); - const blockNum = await web3.eth.getBlockNumber(); - await this.token.transfer(anotherAccount, (amount.divn(4)), { from: owner }); - const blockNum2 = await web3.eth.getBlockNumber(); - await this.token.transfer(anotherAccount, (amount.divn(4)), { from: to }); - const blockNum3 = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(owner, blockNum3)).should.be.bignumber.equal((amount.divn(4))); - (await this.token.balanceOfAt(owner, blockNum2)).should.be.bignumber.equal((amount.divn(4))); - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal((amount.divn(2))); - (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); - - (await this.token.balanceOfAt(to, blockNum3)).should.be.bignumber.equal((amount.divn(4))); - (await this.token.balanceOfAt(to, blockNum2)).should.be.bignumber.equal((amount.divn(2))); - (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal((amount.divn(2))); - (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); - - (await this.token.balanceOfAt(anotherAccount, blockNum3)).should.be.bignumber.equal((amount.divn(2))); - (await this.token.balanceOfAt(anotherAccount, blockNum2)).should.be.bignumber.equal((amount.divn(4))); - (await this.token.balanceOfAt(anotherAccount, blockNum)).should.be.bignumber.equal('0'); - (await this.token.balanceOfAt(anotherAccount, blockNum - 1)).should.be.bignumber.equal('0'); - - (await this.token.totalSupplyAt(blockNum3)).should.be.bignumber.equal(initialSupply); - (await this.token.totalSupplyAt(blockNum2)).should.be.bignumber.equal(initialSupply); - (await this.token.totalSupplyAt(blockNum)).should.be.bignumber.equal(initialSupply); - (await this.token.totalSupplyAt(blockNum - 1)).should.be.bignumber.equal(initialSupply); + context('with no supply changes after the snapshot', function () { + it('returns the current total supply', async function () { + (await this.token.totalSupplyAt(this.initialSnapshotId)).should.be.bignumber.equal(initialSupply); }); }); - }); - describe('when the recipient is the zero address', function () { - const to = ZERO_ADDRESS; - - it('reverts', async function () { - await shouldFail.reverting(this.token.transfer(to, 100, { from: owner })); - }); - }); - }); - - describe('approve', function () { - describe('when the spender is not the zero address', function () { - const spender = recipient; - - describe('when the sender has enough balance', function () { - const amount = new BN('100'); - - it('emits an approval event', async function () { - const { logs } = await this.token.approve(spender, amount, { from: owner }); - - expectEvent.inLogs(logs, 'Approval', { - owner: owner, - spender: spender, - value: amount, - }); + context('with supply changes after the snapshot', function () { + beforeEach(async function () { + await this.token.mint(anyone, new BN('50')); + await this.token.burn(initialHolder, new BN('20')); }); - describe('when there was no approved amount before', function () { - it('approves the requested amount', async function () { - await this.token.approve(spender, amount, { from: owner }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); - }); + it('returns the total supply before the changes', async function () { + (await this.token.totalSupplyAt(this.initialSnapshotId)).should.be.bignumber.equal(initialSupply); }); - describe('when the spender had an approved amount', function () { + context('with a second snapshot after supply changes', function () { beforeEach(async function () { - await this.token.approve(spender, 1, { from: owner }); - }); + this.secondSnapshotId = new BN('2'); - it('approves the requested amount and replaces the previous one', async function () { - await this.token.approve(spender, amount, { from: owner }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id: this.secondSnapshotId }); }); - }); - }); - - describe('when the sender does not have enough balance', function () { - const amount = new BN('101'); - it('emits an approval event', async function () { - const { logs } = await this.token.approve(spender, amount, { from: owner }); + it('snapshots return the supply before and after the changes', async function () { + (await this.token.totalSupplyAt(this.initialSnapshotId)).should.be.bignumber.equal(initialSupply); - expectEvent.inLogs(logs, 'Approval', { - owner: owner, - spender: spender, - value: amount, + (await this.token.totalSupplyAt(this.secondSnapshotId)).should.be.bignumber.equal( + await this.token.totalSupply() + ); }); }); - describe('when there was no approved amount before', function () { - it('approves the requested amount', async function () { - await this.token.approve(spender, amount, { from: owner }); + context('with multiple snapshots after supply changes', function () { + beforeEach(async function () { + this.secondSnapshotIds = [2, 3, 4].map(n => new BN(n)); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + for (const id of this.secondSnapshotIds) { + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id }); + } }); - }); - describe('when the spender had an approved amount', function () { - beforeEach(async function () { - await this.token.approve(spender, 1, { from: owner }); - }); + it('all posterior snapshots return the supply after the changes', async function () { + (await this.token.totalSupplyAt(this.initialSnapshotId)).should.be.bignumber.equal(initialSupply); - it('approves the requested amount and replaces the previous one', async function () { - await this.token.approve(spender, amount, { from: owner }); + const currentSupply = await this.token.totalSupply(); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); + for (const id of this.secondSnapshotIds) { + (await this.token.totalSupplyAt(id)).should.be.bignumber.equal(currentSupply); + } }); }); }); }); - - describe('when the spender is the zero address', function () { - const amount = new BN('100'); - const spender = ZERO_ADDRESS; - - it('reverts', async function () { - await shouldFail.reverting(this.token.approve(spender, amount, { from: owner })); - }); - }); }); - describe('transfer from', function () { - const spender = recipient; - - describe('when the recipient is not the zero address', function () { - const to = anotherAccount; - - describe('when the spender has enough approved balance', function () { - beforeEach(async function () { - await this.token.approve(spender, 100, { from: owner }); - }); - - describe('when the owner has enough balance', function () { - const amount = new BN('100'); - - it('transfers the requested amount', async function () { - await this.token.transferFrom(owner, to, amount, { from: spender }); - - (await this.token.balanceOf(owner)).should.be.bignumber.equal('0'); - - (await this.token.balanceOf(to)).should.be.bignumber.equal(amount); - }); - - it('decreases the spender allowance', async function () { - await this.token.transferFrom(owner, to, amount, { from: spender }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal('0'); - }); - - it('verifies snapshot history', async function () { - await this.token.transferFrom(owner, to, amount, { from: spender }); - - const blockNum = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal('0'); - (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(amount); - - (await this.token.balanceOfAt(to, blockNum)).should.be.bignumber.equal(amount); - (await this.token.balanceOfAt(to, blockNum - 1)).should.be.bignumber.equal('0'); - }); - - it('emits a transfer event', async function () { - const { logs } = await this.token.transferFrom(owner, to, amount, { from: spender }); - - expectEvent.inLogs(logs, 'Transfer', { - from: owner, - to: to, - value: amount, - }); - }); - }); - - describe('when the owner does not have enough balance', function () { - const amount = new BN('101'); - - it('reverts', async function () { - await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); - }); - }); - }); - - describe('when the spender does not have enough approved balance', function () { - beforeEach(async function () { - await this.token.approve(spender, 99, { from: owner }); - }); - - describe('when the owner has enough balance', function () { - const amount = new BN('100'); - - it('reverts', async function () { - await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); - }); - }); - - describe('when the owner does not have enough balance', function () { - const amount = new BN('101'); - - it('reverts', async function () { - await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); - }); - }); - }); + describe('balanceOfAt', function () { + it('reverts with a snapshot id of 0', async function () { + await shouldFail.reverting(this.token.balanceOfAt(anyone, 0)); }); - describe('when the recipient is the zero address', function () { - const amount = new BN('100'); - const to = ZERO_ADDRESS; + it('reverts with a not-yet-created snapshot id', async function () { + await shouldFail.reverting(this.token.balanceOfAt(anyone, 1)); + }); + context('with initial snapshot', function () { beforeEach(async function () { - await this.token.approve(spender, amount, { from: owner }); - }); + this.initialSnapshotId = new BN('1'); - it('reverts', async function () { - await shouldFail.reverting(this.token.transferFrom(owner, to, amount, { from: spender })); + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id: this.initialSnapshotId }); }); - }); - }); - - describe('decrease allowance', function () { - describe('when the spender is not the zero address', function () { - const spender = recipient; - - function shouldDecreaseApproval (amount) { - describe('when there was no approved amount before', function () { - it('reverts', async function () { - await shouldFail.reverting(this.token.decreaseAllowance(spender, amount, { from: owner })); - }); - }); - - describe('when the spender had an approved amount', function () { - const approvedAmount = amount; - - beforeEach(async function () { - ({ logs: this.logs } = await this.token.approve(spender, approvedAmount, { from: owner })); - }); - - it('emits an approval event', async function () { - const { logs } = await this.token.decreaseAllowance(spender, approvedAmount, { from: owner }); - - expectEvent.inLogs(logs, 'Approval', { - owner: owner, - spender: spender, - value: '0', - }); - }); - - it('decreases the spender allowance subtracting the requested amount', async function () { - await this.token.decreaseAllowance(spender, approvedAmount - 1, { from: owner }); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal('1'); - }); - - it('sets the allowance to zero when all allowance is removed', async function () { - await this.token.decreaseAllowance(spender, approvedAmount, { from: owner }); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal('0'); - }); - - it('reverts when more than the full allowance is removed', async function () { - await shouldFail.reverting(this.token.decreaseAllowance(spender, approvedAmount + 1, { from: owner })); - }); + context('with no balance changes after the snapshot', function () { + it('returns the current balance for all accounts', async function () { + (await this.token.balanceOfAt(initialHolder, this.initialSnapshotId)) + .should.be.bignumber.equal(initialSupply); + (await this.token.balanceOfAt(recipient, this.initialSnapshotId)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anyone, this.initialSnapshotId)).should.be.bignumber.equal('0'); }); - } - - describe('when the sender has enough balance', function () { - const amount = new BN('100'); - - shouldDecreaseApproval(amount); }); - describe('when the sender does not have enough balance', function () { - const amount = new BN('101'); - - shouldDecreaseApproval(amount); - }); - }); - - describe('when the spender is the zero address', function () { - const amount = new BN('100'); - const spender = ZERO_ADDRESS; - - it('reverts', async function () { - await shouldFail.reverting(this.token.decreaseAllowance(spender, amount, { from: owner })); - }); - }); - }); - - describe('increase allowance', function () { - const amount = new BN('100'); - - describe('when the spender is not the zero address', function () { - const spender = recipient; - - describe('when the sender has enough balance', function () { - it('emits an approval event', async function () { - const { logs } = await this.token.increaseAllowance(spender, amount, { from: owner }); - - expectEvent.inLogs(logs, 'Approval', { - owner: owner, - spender: spender, - value: amount, - }); + context('with balance changes after the snapshot', function () { + beforeEach(async function () { + await this.token.transfer(recipient, new BN('10'), { from: initialHolder }); + await this.token.mint(recipient, new BN('50')); + await this.token.burn(initialHolder, new BN('20')); }); - describe('when there was no approved amount before', function () { - it('approves the requested amount', async function () { - await this.token.increaseAllowance(spender, amount, { from: owner }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); - }); + it('returns the balances before the changes', async function () { + (await this.token.balanceOfAt(initialHolder, this.initialSnapshotId)) + .should.be.bignumber.equal(initialSupply); + (await this.token.balanceOfAt(recipient, this.initialSnapshotId)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anyone, this.initialSnapshotId)).should.be.bignumber.equal('0'); }); - describe('when the spender had an approved amount', function () { + context('with a second snapshot after supply changes', function () { beforeEach(async function () { - await this.token.approve(spender, 1, { from: owner }); - }); - - it('increases the spender allowance adding the requested amount', async function () { - await this.token.increaseAllowance(spender, amount, { from: owner }); + this.secondSnapshotId = new BN('2'); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount.addn(1)); + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id: this.secondSnapshotId }); }); - }); - }); - - describe('when the sender does not have enough balance', function () { - const amount = new BN('101'); - it('emits an approval event', async function () { - const { logs } = await this.token.increaseAllowance(spender, amount, { from: owner }); + it('snapshots return the balances before and after the changes', async function () { + (await this.token.balanceOfAt(initialHolder, this.initialSnapshotId)) + .should.be.bignumber.equal(initialSupply); + (await this.token.balanceOfAt(recipient, this.initialSnapshotId)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anyone, this.initialSnapshotId)).should.be.bignumber.equal('0'); - expectEvent.inLogs(logs, 'Approval', { - owner: owner, - spender: spender, - value: amount, + (await this.token.balanceOfAt(initialHolder, this.secondSnapshotId)).should.be.bignumber.equal( + await this.token.balanceOf(initialHolder) + ); + (await this.token.balanceOfAt(recipient, this.secondSnapshotId)).should.be.bignumber.equal( + await this.token.balanceOf(recipient) + ); + (await this.token.balanceOfAt(anyone, this.secondSnapshotId)).should.be.bignumber.equal( + await this.token.balanceOf(anyone) + ); }); }); - describe('when there was no approved amount before', function () { - it('approves the requested amount', async function () { - await this.token.increaseAllowance(spender, amount, { from: owner }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount); - }); - }); - - describe('when the spender had an approved amount', function () { + context('with multiple snapshots after supply changes', function () { beforeEach(async function () { - await this.token.approve(spender, 1, { from: owner }); - }); - - it('increases the spender allowance adding the requested amount', async function () { - await this.token.increaseAllowance(spender, amount, { from: owner }); - - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(amount.addn(1)); - }); - }); - }); - }); - - describe('when the spender is the zero address', function () { - const spender = ZERO_ADDRESS; - - it('reverts', async function () { - await shouldFail.reverting(this.token.increaseAllowance(spender, amount, { from: owner })); - }); - }); - }); - - describe('_mint', function () { - const initialSupply = new BN('100'); - const amount = new BN('50'); - - it('rejects a zero account', async function () { - await shouldFail.reverting(this.token.mint(ZERO_ADDRESS, amount)); - }); - - describe('for a non zero account', function () { - beforeEach('minting', async function () { - const { logs } = await this.token.mint(recipient, amount); - this.blockNum = await web3.eth.getBlockNumber(); - this.logs = logs; - }); - - it('increments totalSupply', async function () { - const expectedSupply = initialSupply.add(amount); - (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); - }); - - it('increments totalSupply - verify snapshots', async function () { - const expectedSupply = initialSupply.add(amount); + this.secondSnapshotIds = [2, 3, 4].map(n => new BN(n)); - (await this.token.totalSupplyAt(this.blockNum)).should.be.bignumber.equal(expectedSupply); - (await this.token.totalSupplyAt(this.blockNum - 1)).should.be.bignumber.equal(initialSupply); - }); - - it('increments recipient balance', async function () { - (await this.token.balanceOf(recipient)).should.be.bignumber.equal(amount); - }); - - it('verifies snapshot history', async function () { - const blockNum = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(recipient, blockNum)).should.be.bignumber.equal(amount); - (await this.token.balanceOfAt(recipient, blockNum - 1)).should.be.bignumber.equal('0'); - }); - - it('emits Transfer event', async function () { - const event = expectEvent.inLogs(this.logs, 'Transfer', { - from: ZERO_ADDRESS, - to: recipient, - }); - - event.args.value.should.be.bignumber.equal(amount); - }); - }); - }); - - describe('_burn', function () { - const initialSupply = new BN('100'); - - it('rejects a zero account', async function () { - await shouldFail.reverting(this.token.burn(ZERO_ADDRESS, 1)); - }); - - describe('for a non zero account', function () { - it('rejects burning more than balance', async function () { - await shouldFail.reverting(this.token.burn(owner, initialSupply.addn(1))); - }); - - const describeBurn = function (description, amount) { - describe(description, function () { - beforeEach('burning', async function () { - const { logs } = await this.token.burn(owner, amount); - this.logs = logs; + for (const id of this.secondSnapshotIds) { + const { logs } = await this.token.snapshot(); + expectEvent.inLogs(logs, 'Snapshot', { id }); + } }); - it('decrements totalSupply', async function () { - const expectedSupply = initialSupply.sub(amount); - (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); - }); + it('all posterior snapshots return the supply after the changes', async function () { + (await this.token.balanceOfAt(initialHolder, this.initialSnapshotId)) + .should.be.bignumber.equal(initialSupply); + (await this.token.balanceOfAt(recipient, this.initialSnapshotId)).should.be.bignumber.equal('0'); + (await this.token.balanceOfAt(anyone, this.initialSnapshotId)).should.be.bignumber.equal('0'); - it('decrements owner balance', async function () { - const expectedBalance = initialSupply.sub(amount); - (await this.token.balanceOf(owner)).should.be.bignumber.equal(expectedBalance); - }); - - it('verifies snapshot history', async function () { - const blockNum = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply.sub(amount)); - (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(initialSupply); - }); - - it('emits Transfer event', async function () { - const event = expectEvent.inLogs(this.logs, 'Transfer', { - from: owner, - to: ZERO_ADDRESS, - }); - - event.args.value.should.be.bignumber.equal(amount); + for (const id of this.secondSnapshotIds) { + (await this.token.balanceOfAt(initialHolder, id)).should.be.bignumber.equal( + await this.token.balanceOf(initialHolder) + ); + (await this.token.balanceOfAt(recipient, id)).should.be.bignumber.equal( + await this.token.balanceOf(recipient) + ); + (await this.token.balanceOfAt(anyone, id)).should.be.bignumber.equal( + await this.token.balanceOf(anyone) + ); + } }); }); - }; - - describeBurn('for entire balance', initialSupply); - describeBurn('for less amount than balance', initialSupply.subn(1)); - }); - }); - - describe('_burnFrom', function () { - const initialSupply = new BN('100'); - const allowance = new BN('70'); - - const spender = anotherAccount; - - beforeEach('approving', async function () { - await this.token.approve(spender, allowance, { from: owner }); - }); - - it('rejects a null account', async function () { - await shouldFail.reverting(this.token.burnFrom(ZERO_ADDRESS, 1)); - }); - - describe('for a non null account', function () { - it('rejects burning more than allowance', async function () { - await shouldFail.reverting(this.token.burnFrom(owner, allowance.addn(1))); - }); - - it('rejects burning more than balance', async function () { - await shouldFail.reverting(this.token.burnFrom(owner, initialSupply.addn(1))); }); - - const describeBurnFrom = function (description, amount) { - describe(description, function () { - beforeEach('burning', async function () { - const { logs } = await this.token.burnFrom(owner, amount, { from: spender }); - this.logs = logs; - }); - - it('decrements totalSupply', async function () { - const expectedSupply = initialSupply.sub(amount); - (await this.token.totalSupply()).should.be.bignumber.equal(expectedSupply); - }); - - it('decrements owner balance', async function () { - const expectedBalance = initialSupply.sub(amount); - (await this.token.balanceOf(owner)).should.be.bignumber.equal(expectedBalance); - }); - - it('decrements spender allowance', async function () { - const expectedAllowance = allowance.sub(amount); - (await this.token.allowance(owner, spender)).should.be.bignumber.equal(expectedAllowance); - }); - - it('verifies snapshot history', async function () { - const blockNum = await web3.eth.getBlockNumber(); - - (await this.token.balanceOfAt(owner, blockNum)).should.be.bignumber.equal(initialSupply.sub(amount)); - (await this.token.balanceOfAt(owner, blockNum - 1)).should.be.bignumber.equal(initialSupply); - }); - - it('emits Transfer event', async function () { - const event = expectEvent.inLogs(this.logs, 'Transfer', { - from: owner, - to: ZERO_ADDRESS, - }); - - event.args.value.should.be.bignumber.equal(amount); - }); - }); - }; - - describeBurnFrom('for entire allowance', allowance); - describeBurnFrom('for less amount than allowance', allowance.subn(1)); }); }); }); From 06080f3677e17f381d78b4c500de168ee84f727c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Tue, 22 Jan 2019 17:17:50 -0300 Subject: [PATCH 03/12] Add ERC20Snapshot changelog entry. --- CHANGELOG.md | 1 + 1 file changed, 1 insertion(+) diff --git a/CHANGELOG.md b/CHANGELOG.md index 393bb199bf6..4972d0b17e0 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -4,6 +4,7 @@ ### New features: * `ERC20`: added internal `_approve(address owner, address spender, uint256 value)`, allowing derived contracts to set the allowance of arbitrary accounts. + * `ERC20Snapshot`: create snapshots on demand of the token balances and total supply, to later retrieve and e.g. calculate voting power at a past time. ### Improvements: * Upgraded the minimum compiler version to v0.5.2: this removes many Solidity warnings that were false positives. From 46e54fae382fecd169c319cdb88b3eeab9fa013f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 10:58:02 -0300 Subject: [PATCH 04/12] Move ERC20Snapshot to drafts. --- contracts/{token/ERC20 => drafts}/ERC20Snapshot.sol | 6 +++--- contracts/mocks/ERC20SnapshotMock.sol | 2 +- test/{token/ERC20 => drafts}/ERC20Snapshot.test.js | 0 3 files changed, 4 insertions(+), 4 deletions(-) rename contracts/{token/ERC20 => drafts}/ERC20Snapshot.sol (98%) rename test/{token/ERC20 => drafts}/ERC20Snapshot.test.js (100%) diff --git a/contracts/token/ERC20/ERC20Snapshot.sol b/contracts/drafts/ERC20Snapshot.sol similarity index 98% rename from contracts/token/ERC20/ERC20Snapshot.sol rename to contracts/drafts/ERC20Snapshot.sol index d2b00b32a3e..c8ad05717a9 100644 --- a/contracts/token/ERC20/ERC20Snapshot.sol +++ b/contracts/drafts/ERC20Snapshot.sol @@ -1,8 +1,8 @@ pragma solidity ^0.5.2; -import "../../math/SafeMath.sol"; -import "../../utils/Arrays.sol"; -import "./ERC20.sol"; +import "../math/SafeMath.sol"; +import "../utils/Arrays.sol"; +import "../token/ERC20/ERC20.sol"; /** * @title ERC20 token with snapshots. diff --git a/contracts/mocks/ERC20SnapshotMock.sol b/contracts/mocks/ERC20SnapshotMock.sol index e460e070457..08b4140d178 100644 --- a/contracts/mocks/ERC20SnapshotMock.sol +++ b/contracts/mocks/ERC20SnapshotMock.sol @@ -1,6 +1,6 @@ pragma solidity ^0.5.2; -import "../token/ERC20/ERC20Snapshot.sol"; +import "../drafts/ERC20Snapshot.sol"; contract ERC20SnapshotMock is ERC20Snapshot { diff --git a/test/token/ERC20/ERC20Snapshot.test.js b/test/drafts/ERC20Snapshot.test.js similarity index 100% rename from test/token/ERC20/ERC20Snapshot.test.js rename to test/drafts/ERC20Snapshot.test.js From 8d733e2233cf73b064d7324a42c6235ef250fa25 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 14:04:56 -0300 Subject: [PATCH 05/12] Improve changelog entry. --- CHANGELOG.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index 4972d0b17e0..d9118d0dcce 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -4,7 +4,7 @@ ### New features: * `ERC20`: added internal `_approve(address owner, address spender, uint256 value)`, allowing derived contracts to set the allowance of arbitrary accounts. - * `ERC20Snapshot`: create snapshots on demand of the token balances and total supply, to later retrieve and e.g. calculate voting power at a past time. + * `ERC20Snapshot`: create snapshots on demand of the token balances and total supply, to later retrieve and e.g. calculate dividends at a past time. ### Improvements: * Upgraded the minimum compiler version to v0.5.2: this removes many Solidity warnings that were false positives. From 42b3f1229dae16ded0668d717ef2462b3f466843 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 14:06:36 -0300 Subject: [PATCH 06/12] Make snapshot tests clearer. --- test/drafts/ERC20Snapshot.test.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/test/drafts/ERC20Snapshot.test.js b/test/drafts/ERC20Snapshot.test.js index 8162a5bc613..0d327b39ec0 100644 --- a/test/drafts/ERC20Snapshot.test.js +++ b/test/drafts/ERC20Snapshot.test.js @@ -74,7 +74,7 @@ contract('ERC20Snapshot', function ([_, initialHolder, recipient, anyone]) { context('with multiple snapshots after supply changes', function () { beforeEach(async function () { - this.secondSnapshotIds = [2, 3, 4].map(n => new BN(n)); + this.secondSnapshotIds = ['2', '3', '4']; for (const id of this.secondSnapshotIds) { const { logs } = await this.token.snapshot(); @@ -164,7 +164,7 @@ contract('ERC20Snapshot', function ([_, initialHolder, recipient, anyone]) { context('with multiple snapshots after supply changes', function () { beforeEach(async function () { - this.secondSnapshotIds = [2, 3, 4].map(n => new BN(n)); + this.secondSnapshotIds = ['2', '3', '4']; for (const id of this.secondSnapshotIds) { const { logs } = await this.token.snapshot(); From ec2bea0e4c03d481b10a97ef10b35d34f1f86b69 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 14:12:25 -0300 Subject: [PATCH 07/12] Refactor ERC20Snapshots to use Counters. --- contracts/drafts/ERC20Snapshot.sol | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/contracts/drafts/ERC20Snapshot.sol b/contracts/drafts/ERC20Snapshot.sol index c8ad05717a9..94c114fd9bc 100644 --- a/contracts/drafts/ERC20Snapshot.sol +++ b/contracts/drafts/ERC20Snapshot.sol @@ -2,6 +2,7 @@ pragma solidity ^0.5.2; import "../math/SafeMath.sol"; import "../utils/Arrays.sol"; +import "../drafts/Counters.sol"; import "../token/ERC20/ERC20.sol"; /** @@ -12,6 +13,7 @@ import "../token/ERC20/ERC20.sol"; contract ERC20Snapshot is ERC20 { using SafeMath for uint256; using Arrays for uint256[]; + using Counters for Counters.Counter; // Snapshots store a value at the time a snapshot is taken (and a new snapshot id created), and the corresponding // snapshot id. Each account has individual snapshots taken on demand, as does the token's total supply. @@ -26,7 +28,7 @@ contract ERC20Snapshot is ERC20 { uint256[] private _totalSupplySnapshotValues; // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid. - uint256 private _currentSnapshotId; + Counters.Counter private _currentSnapshotId; event Snapshot(uint256 id); @@ -34,9 +36,11 @@ contract ERC20Snapshot is ERC20 { // balance change will not be recorded. This means the extra added cost of storing snapshotted balances is only paid // when required, but is also flexible enough that it allows for e.g. daily snapshots. function snapshot() public returns (uint256) { - _currentSnapshotId += 1; - emit Snapshot(_currentSnapshotId); - return _currentSnapshotId; + _currentSnapshotId.increment(); + + uint256 currentId = _currentSnapshotId.current(); + emit Snapshot(currentId); + return currentId; } function balanceOfAt(address account, uint256 snapshotId) public view returns (uint256) { @@ -93,7 +97,7 @@ contract ERC20Snapshot is ERC20 { private view returns (bool, uint256) { require(snapshotId > 0); - require(snapshotId <= _currentSnapshotId); + require(snapshotId <= _currentSnapshotId.current()); uint256 index = ids.findUpperBound(snapshotId); @@ -113,8 +117,9 @@ contract ERC20Snapshot is ERC20 { } function _updateSnapshot(uint256[] storage values, uint256[] storage ids, uint256 currentValue) private { - if (_lastSnapshotId(ids) < _currentSnapshotId) { - ids.push(_currentSnapshotId); + uint256 currentId = _currentSnapshotId.current(); + if (_lastSnapshotId(ids) < currentId) { + ids.push(currentId); values.push(currentValue); } } From 5fb6feafc2404be169286fa894064c0f8e5a54d4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 14:20:32 -0300 Subject: [PATCH 08/12] Refactor snapshot arrays into a struct. --- contracts/drafts/ERC20Snapshot.sol | 40 +++++++++++++++--------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/contracts/drafts/ERC20Snapshot.sol b/contracts/drafts/ERC20Snapshot.sol index 94c114fd9bc..a813d6004ab 100644 --- a/contracts/drafts/ERC20Snapshot.sol +++ b/contracts/drafts/ERC20Snapshot.sol @@ -18,14 +18,15 @@ contract ERC20Snapshot is ERC20 { // Snapshots store a value at the time a snapshot is taken (and a new snapshot id created), and the corresponding // snapshot id. Each account has individual snapshots taken on demand, as does the token's total supply. - // These two fields (value and id) belong together, but are not part of a struct so that functions that work on - // arrays can be called on them. - - mapping (address => uint256[]) private _accountSnapshotIds; - mapping (address => uint256[]) private _accountSnapshotValues; + // Snapshoted values have arrays of ids and the value corresponding to that id. These could be an array of a + // Snapshot struct, but that would impede usage of functions that work on an array. + struct Snapshots { + uint256[] ids; + uint256[] values; + } - uint256[] private _totalSupplySnapshotIds; - uint256[] private _totalSupplySnapshotValues; + mapping (address => Snapshots) private _accountBalanceSnapshots; + Snapshots private _totalSupplySnaphots; // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid. Counters.Counter private _currentSnapshotId; @@ -44,14 +45,13 @@ contract ERC20Snapshot is ERC20 { } function balanceOfAt(address account, uint256 snapshotId) public view returns (uint256) { - (bool snapshotted, uint256 value) = - _valueAt(snapshotId, _accountSnapshotValues[account], _accountSnapshotIds[account]); + (bool snapshotted, uint256 value) = _valueAt(snapshotId, _accountBalanceSnapshots[account]); return snapshotted ? value : balanceOf(account); } function totalSupplyAt(uint256 snapshotId) public view returns(uint256) { - (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshotValues, _totalSupplySnapshotIds); + (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnaphots); return snapshotted ? value : totalSupply(); } @@ -93,34 +93,34 @@ contract ERC20Snapshot is ERC20 { // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does // exactly this. - function _valueAt(uint256 snapshotId, uint256[] storage values, uint256[] storage ids) + function _valueAt(uint256 snapshotId, Snapshots storage snapshots) private view returns (bool, uint256) { require(snapshotId > 0); require(snapshotId <= _currentSnapshotId.current()); - uint256 index = ids.findUpperBound(snapshotId); + uint256 index = snapshots.ids.findUpperBound(snapshotId); - if (index == ids.length) { + if (index == snapshots.ids.length) { return (false, 0); } else { - return (true, values[index]); + return (true, snapshots.values[index]); } } function _updateAccountSnapshot(address account) private { - _updateSnapshot(_accountSnapshotValues[account], _accountSnapshotIds[account], balanceOf(account)); + _updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account)); } function _updateTotalSupplySnapshot() private { - _updateSnapshot(_totalSupplySnapshotValues, _totalSupplySnapshotIds, totalSupply()); + _updateSnapshot(_totalSupplySnaphots, totalSupply()); } - function _updateSnapshot(uint256[] storage values, uint256[] storage ids, uint256 currentValue) private { + function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private { uint256 currentId = _currentSnapshotId.current(); - if (_lastSnapshotId(ids) < currentId) { - ids.push(currentId); - values.push(currentValue); + if (_lastSnapshotId(snapshots.ids) < currentId) { + snapshots.ids.push(currentId); + snapshots.values.push(currentValue); } } From 886118b1a658a293981e0b3d0ac08bd78cef8aa6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 14:23:27 -0300 Subject: [PATCH 09/12] Remove .DS_Store files. --- .DS_Store | Bin 8196 -> 0 bytes .gitignore | 2 +- contracts/.DS_Store | Bin 8196 -> 0 bytes contracts/token/.DS_Store | Bin 6148 -> 0 bytes test/.DS_Store | Bin 6148 -> 0 bytes test/token/.DS_Store | Bin 6148 -> 0 bytes 6 files changed, 1 insertion(+), 1 deletion(-) delete mode 100644 .DS_Store delete mode 100644 contracts/.DS_Store delete mode 100644 contracts/token/.DS_Store delete mode 100644 test/.DS_Store delete mode 100644 test/token/.DS_Store diff --git a/.DS_Store b/.DS_Store deleted file mode 100644 index 486ab486467436a8078de7422527d2ee2c2e5b2d..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 8196 zcmeHMTW-@p6ur}?)CsNHB2fG3A0$3X)v6V=LP%+v0Fj_YIDinK)_F8FxOSB|L=b}V z!ybSguoPCnLRbKtJ7Xf-al{YhIaAG?v3<`S`^=qju1iFs(5bHxEfJA{$~b=(O-kYG zTt~`8c;*67fKL>ZUB6a!{pyIVKA{!R3TOqi0$KsBz@MQ2-q~D?G4FkKRkvCJt-yb& z0PhbbDq}vxfkL@;pphv6FoV;wppQI2a?B9(Ar2HuDtxN!L4;HhrWiueaouEdU_Qiw zLPaN`=p@3CMVO%oIXZZzG$)Z)s9UXoR$x>C&fTZTrViD~iRJISkglO#`YMa0&d?6s zqHWrxn^dCPvQ(=OPp$9#0x4vwl}zvBDuuy0o%IF0W9{P`W<3v9=0v?ST7H(>JQq2ty4 zZo%((^|th5sSAdYHM0BjOTFIu#?@tWeQUG7Z1y%cx0cO~^(*~;)>yo_cD;OX{PI=r zb^pzKJQj)w_e`2o$HVpmdMV<(uv(t$drhXI&V`dzp?g%O0;a42*Sko=JvO)Wb}|!x)~_FUre8^%9m` zk?y32JF6#*hW!T#UZgSJH0GuTRUF*u=n}zlj9F)3(*Ps-$q!3kK)H0g ze{}&3g-9%$1qjr_zIup1SB8w*g$`x#$>~o7Dt4imbcjJ+v;wE5z@+lL#QA?|{P+J; 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find-up "^2.1.0" - get-caller-file "^1.0.1" - os-locale "^2.0.0" - require-directory "^2.1.1" - require-main-filename "^1.0.1" - set-blocking "^2.0.0" - string-width "^2.0.0" - which-module "^2.0.0" - y18n "^3.2.1" - yargs-parser "^9.0.2" - -yargs@^4.6.0: - version "4.8.1" - resolved "https://registry.yarnpkg.com/yargs/-/yargs-4.8.1.tgz#c0c42924ca4aaa6b0e6da1739dfb216439f9ddc0" - integrity sha1-wMQpJMpKqmsObaFznfshZDn53cA= - dependencies: - cliui "^3.2.0" - decamelize "^1.1.1" - get-caller-file "^1.0.1" - lodash.assign "^4.0.3" - os-locale "^1.4.0" - read-pkg-up "^1.0.1" - require-directory "^2.1.1" - require-main-filename "^1.0.1" - set-blocking "^2.0.0" - string-width "^1.0.1" - which-module "^1.0.0" - window-size "^0.2.0" - y18n "^3.2.1" - yargs-parser "^2.4.1" From 51f4a7cbeedd6ce70247f29de6854793736fe55d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= Date: Wed, 23 Jan 2019 15:35:33 -0300 Subject: [PATCH 11/12] Fix linter error. --- contracts/drafts/ERC20Snapshot.sol | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/contracts/drafts/ERC20Snapshot.sol b/contracts/drafts/ERC20Snapshot.sol index a813d6004ab..44b39091d32 100644 --- a/contracts/drafts/ERC20Snapshot.sol +++ b/contracts/drafts/ERC20Snapshot.sol @@ -8,6 +8,8 @@ import "../token/ERC20/ERC20.sol"; /** * @title ERC20 token with snapshots. * inspired by Jordi Baylina's MiniMeToken to record historical balances + * Snapshots store a value at the time a snapshot is taken (and a new snapshot id created), and the corresponding + * snapshot id. Each account has individual snapshots taken on demand, as does the token's total supply. * @author Validity Labs AG */ contract ERC20Snapshot is ERC20 { @@ -15,9 +17,6 @@ contract ERC20Snapshot is ERC20 { using Arrays for uint256[]; using Counters for Counters.Counter; - // Snapshots store a value at the time a snapshot is taken (and a new snapshot id created), and the corresponding - // snapshot id. Each account has individual snapshots taken on demand, as does the token's total supply. - // Snapshoted values have arrays of ids and the value corresponding to that id. These could be an array of a // Snapshot struct, but that would impede usage of functions that work on an array. struct Snapshots { From b061bbb968348df52d612dbe965da959bec30e9b Mon Sep 17 00:00:00 2001 From: Francisco Giordano Date: Wed, 6 Feb 2019 16:26:41 -0300 Subject: [PATCH 12/12] simplify gitignore entry --- .gitignore | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/.gitignore b/.gitignore index af9c409be9e..a93fffc04f9 100644 --- a/.gitignore +++ b/.gitignore @@ -32,8 +32,8 @@ npm-debug.log # truffle build directory build/ -# lol macs -**/.DS_Store +# macOS +.DS_Store # truffle .node-xmlhttprequest-*