@gooddollar/goodcontracts

{ "contractName": "cERC20", "abi": [ { "constant": false, "inputs": [ { "internalType": "uint256", "name": "mintAmount", "type": "uint256" } ], "name": "mint", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "uint256", "name": "mintAmount", "type": "uint256" } ], "name": "redeemUnderlying", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [], "name": "exchangeRateCurrent", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "exchangeRateStored", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "address", "name": "addr", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transfer", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.5.16+commit.9c3226ce\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"constant\":true,\"inputs\":[{\"internalType\":\"address\",\"name\":\"addr\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"exchangeRateCurrent\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"exchangeRateStored\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"mintAmount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"mintAmount\",\"type\":\"uint256\"}],\"name\":\"redeemUnderlying\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/stakingModel/contracts/SimpleDAIStaking.sol\":\"cERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/DSMath.sol\":{\"keccak256\":\"0x59fb5b1c4c3f68c1694f6ff5698016ac8ee9401b61e87473113dc103b7a6b0ff\",\"urls\":[\"bzz-raw://7410f43989dea44e64bed870958ce9199606dd8a9783e79fe8deca7b544164af\",\"dweb:/ipfs/QmPrrdvp2ErwL6SJSveB3JANo7ivadSMnk9gpWZD8nR7hy\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/dao/schemes/FeelessScheme.sol\":{\"keccak256\":\"0x7c542d44cbd864ee0ddecbc5016d9d7eb9ce65ab463fdd9f21eb8ce3c6ffc8ea\",\"urls\":[\"bzz-raw://4753dd823c0b0cbe7d7d02e1df64ace07d7a163af3aaff12697aee70a1b45f2f\",\"dweb:/ipfs/QmPkKeH88M3f6UbHphayUbjEBNV4rmoogtDmVundzBKbFK\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/dao/schemes/SchemeGuard.sol\":{\"keccak256\":\"0x32e1b2a172e2c22a6aa757bfcb0722cc67f64c5c2e48df3dec2737903516d565\",\"urls\":[\"bzz-raw://bee57a8eba08348e93a0c18f3ab534e67865c0fa27afe27f5cf234bd5f248915\",\"dweb:/ipfs/Qmd8aveHWcUkYWMyJrJRZPyVXj8MAMBfpBFo6g4Z2VJeo3\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/identity/Identity.sol\":{\"keccak256\":\"0x282184478f1d618d3523b28a84a7f7003dfdc99cad120e5e358d2cce1f5fb491\",\"urls\":[\"bzz-raw://67e17ecb57b24c4fb801abc2c52c3148af3b967e28da4fb7e074d18efb7a57c1\",\"dweb:/ipfs/QmfZ8jXhdTHtxr3gfByRj4HnXnGynX7SLZWWGR8k768aGB\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/identity/IdentityAdminRole.sol\":{\"keccak256\":\"0x8e82c45eefe0da77d017144dfad12602c68124297035937901cdd08ce48c57ff\",\"urls\":[\"bzz-raw://e20e606342b3b35f41a081294cf3f716fe7e27e81d3090daa37c5208f4ef4bc3\",\"dweb:/ipfs/QmVEhHpiwVsksnPyHkfNa5LpTBLxoP9kj5NRZUBv456ewK\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/contracts/identity/IdentityGuard.sol\":{\"keccak256\":\"0xcc395c0e8f812201b5ed1f45e7272120ee5ffe73bfe13e325dfd872aef235b22\",\"urls\":[\"bzz-raw://58f93e4b9f48ec31ac151208e4f9e6b356cc23dfc9585d846bc09bf35d6ff7be\",\"dweb:/ipfs/QmdxJHUCaFx8N66kkDhYdA4k6d2V91yBRG6sombuPxBq7X\"]},\"/Users/hadar/workspace/GoodDollar/GoodBootstrap/packages/contracts/stakingModel/contracts/SimpleDAIStaking.sol\":{\"keccak256\":\"0x245246632bb2a59a67277107f64975487806db57f8ad49d14e9626d8d72cd186\",\"urls\":[\"bzz-raw://e767763526d6b497514991f02db1a3da9c925ce32e522213f943cd2b8305cf12\",\"dweb:/ipfs/QmfUjN8Z59ZZNb3vkChmjoTGrpxwrNKNxzjML2pmrhWD2T\"]},\"@daostack/arc/contracts/controller/Avatar.sol\":{\"keccak256\":\"0x4e4fb9d3bc21f42fbfc6a01e9f8aa483a59e9f447b0d604f55b587a81ec09ef4\",\"urls\":[\"bzz-raw://9d3c1c7575cf6075ea1d89921f09b9b8e322b208dacaf0446cd4f64506c999f0\",\"dweb:/ipfs/QmVGDDHAR2ByuQpbgV7BBKXGEAcbaWvejpEZYzHgaagBFK\"]},\"@daostack/arc/contracts/controller/ControllerInterface.sol\":{\"keccak256\":\"0x933e92612c90f292c7b59908958b003f1a13d90b97bed0572b566353c20974dc\",\"urls\":[\"bzz-raw://ce1fcf85b744fcce2dbd4205e3943e9b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"bytecode": "0x", "deployedBytecode": "0x", "sourceMap": "", "deployedSourceMap": "", "source": "pragma solidity >0.5.4;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\nimport \"openzeppelin-solidity/contracts/lifecycle/Pausable.sol\";\nimport \"openzeppelin-solidity/contracts/token/ERC20/ERC20.sol\";\nimport \"@daostack/arc/contracts/controller/Avatar.sol\";\nimport \"../../contracts/dao/schemes/FeelessScheme.sol\";\nimport \"../../contracts/identity/Identity.sol\";\nimport \"../../contracts/DSMath.sol\";\n\ninterface cERC20 {\n function mint(uint256 mintAmount) external returns (uint256);\n\n function redeemUnderlying(uint256 mintAmount) external returns (uint256);\n\n function exchangeRateCurrent() external returns (uint256);\n\n function exchangeRateStored() external view returns (uint256);\n\n function balanceOf(address addr) external view returns (uint256);\n\n function transfer(address to, uint256 amount) external returns (bool);\n}\n\n/**\n * @title Staking contract that donates earned interest to the DAO\n * allowing stakers to deposit DAI or withdraw their stake in DAI.\n * The contract buys cDAI and can transfer the daily interest to the DAO\n */\ncontract SimpleDAIStaking is DSMath, Pausable, FeelessScheme {\n using SafeMath for uint256;\n\n // Entity that holds a staker info\n struct Staker {\n // The staked DAI amount\n uint256 stakedDAI;\n // The latest block number which the\n // staker has staked tokens\n uint256 lastStake;\n }\n\n // The map which holds the stakers entities\n mapping(address => Staker) public stakers;\n\n // Emits when new DAI tokens have been staked\n event DAIStaked(\n // The staker address\n address indexed staker,\n // How many tokens have been staked\n uint256 daiValue\n );\n\n // Emits when DAI tokens are being withdrawn\n event DAIStakeWithdraw(\n // The staker that initiate the action\n address indexed staker,\n // The initial DAI value that was staked\n uint256 daiValue,\n // The current DAI value that was staked\n uint256 daiActual\n );\n\n // Emits when the interest is collected\n event InterestCollected(\n // Who is receives the interest\n address recipient,\n // How many cDAI tokens have been transferred\n uint256 cdaiValue,\n // The worth of the transferred tokens in DAI\n uint256 daiValue,\n // Lost amount. A result of different precisions\n uint256 daiPrecisionLoss\n );\n\n // DAI token address\n ERC20 public dai;\n\n // cDAI token address\n cERC20 public cDai;\n\n // The block interval defines the number of\n // blocks that shall be passed before the\n // next execution of `collectUBIInterest`\n uint256 public blockInterval;\n\n // The last block number which\n // `collectUBIInterest` has been executed in\n uint256 public lastUBICollection;\n\n // The total staked DAI amount in the contract\n uint256 public totalStaked = 0;\n\n // How much of the generated interest is donated,\n // meaning no GD is expected in compensation, 1 in mil precision.\n // 100% for phase0 POC\n uint32 public avgInterestDonatedRatio = 1e6;\n\n // The address of the fund manager contract\n address public fundManager;\n\n modifier onlyFundManager {\n require(msg.sender == fundManager, \"Only FundManager can call this method\");\n _;\n }\n\n /**\n * @dev Constructor\n * @param _dai The address of DAI\n * @param _cDai The address of cDAI\n * @param _fundManager The address of the fund manager contract\n * @param _blockInterval How many blocks should be passed before the next execution of `collectUBIInterest`\n * @param _avatar The avatar of the DAO\n * @param _identity The identity contract\n */\n constructor(\n address _dai,\n address _cDai,\n address _fundManager,\n uint256 _blockInterval,\n Avatar _avatar,\n Identity _identity\n ) public FeelessScheme(_identity, _avatar) {\n dai = ERC20(_dai);\n cDai = cERC20(_cDai);\n blockInterval = _blockInterval;\n lastUBICollection = block.number.div(blockInterval);\n fundManager = _fundManager;\n\n // Adds the avatar as a pauser of this contract\n addPauser(address(avatar));\n }\n\n /**\n * @dev Allows the DAO to change the fund manager contract address\n * @param _fundManager Address of the new contract\n */\n function setFundManager(address _fundManager) public onlyAvatar {\n fundManager = _fundManager;\n }\n\n /**\n * @dev Allows a staker to deposit DAI tokens. Notice that `approve` is\n * needed to be executed before the execution of this method.\n * Can be executed only when the contract is not paused.\n * @param _amount The amount of DAI to stake\n */\n function stakeDAI(uint256 _amount) public whenNotPaused {\n require(_amount > 0, \"You need to stake a positive token amount\");\n require(\n dai.transferFrom(msg.sender, address(this), _amount) == true,\n \"transferFrom failed, make sure you approved DAI transfer\"\n );\n\n // approve the transfer to cDAI\n dai.approve(address(cDai), _amount);\n\n // mint ctokens\n uint256 res = cDai.mint(_amount);\n\n // cDAI returns >0 if error happened while minting.\n // Makes sure that there are no errors. If an error\n // has occurred, DAI funds shall be returned.\n if (res > 0) {\n require(res == 0, \"Minting cDai failed, funds returned\");\n }\n\n // updated the staker entity\n Staker storage staker = stakers[msg.sender];\n staker.stakedDAI = staker.stakedDAI.add(_amount);\n staker.lastStake = block.number;\n\n // adds the staked amount to the total staked\n totalStaked = totalStaked.add(_amount);\n\n emit DAIStaked(msg.sender, _amount);\n }\n\n /**\n * @dev Withdraws the sender staked DAI.\n */\n function withdrawStake() public {\n Staker storage staker = stakers[msg.sender];\n require(staker.stakedDAI > 0, \"No DAI staked\");\n require(cDai.redeemUnderlying(staker.stakedDAI) == 0, \"Failed to redeem cDai\");\n uint256 daiWithdraw = staker.stakedDAI;\n\n // updates balance before transfer to prevent re-entry\n staker.stakedDAI = 0;\n\n totalStaked = totalStaked.sub(daiWithdraw);\n\n //redeeming in compound may result in a tiny fraction of precission error\n //so if we redeem 100 DAI we might get something like 99.9999999999\n uint256 daiActual = dai.balanceOf(address(this));\n if (daiActual < daiWithdraw) {\n daiWithdraw = daiActual;\n }\n require(dai.transfer(msg.sender, daiWithdraw), \"withdraw transfer failed\");\n emit DAIStakeWithdraw(msg.sender, daiWithdraw, daiActual);\n }\n\n /**\n * @dev Calculates the worth of the staked cDAI tokens in DAI.\n * @return (uint256) The worth in DAI\n */\n function currentDAIWorth() public view returns (uint256) {\n uint256 er = cDai.exchangeRateStored();\n\n //TODO: why 1e10? cDai is e8 so we should convert it to e28 like exchange rate\n uint256 daiBalance = rmul(cDai.balanceOf(address(this)).mul(1e10), er).div(10);\n return daiBalance;\n }\n\n /**\n * @dev Calculates the current interest that was gained.\n * @return (uint256, uint256, uint256) The interest in cDAI, the interest in DAI,\n * the amount which is not covered by precision of DAI\n */\n function currentUBIInterest()\n public\n view\n returns (\n uint256,\n uint256,\n uint256\n )\n {\n uint256 er = cDai.exchangeRateStored();\n uint256 daiWorth = currentDAIWorth();\n if (daiWorth <= totalStaked) {\n return (0, 0, 0);\n }\n uint256 daiGains = daiWorth.sub(totalStaked);\n // mul by 1e10 to equalize precision otherwise since exchangerate\n // is very big, dividing by it would result in 0.\n uint256 cdaiGains = rdiv(daiGains.mul(1e10), er);\n // gets right most bits not covered by precision of cdai which is\n // only 8 decimals while RAY is 27\n uint256 precisionLossCDaiRay = cdaiGains.mod(1e19);\n // lower back to 8 decimals\n cdaiGains = cdaiGains.div(1e19);\n //div by 1e10 to get results in dai precision 1e18\n uint256 precisionLossDai = rmul(precisionLossCDaiRay, er).div(1e10);\n return (cdaiGains, daiGains, precisionLossDai);\n }\n\n /**\n * @dev Collects gained interest by fundmanager. Can be collected only once\n * in an interval which is defined above.\n * @param _recipient The recipient of cDAI gains\n * @return (uint256, uint256, uint256, uint32) The interest in cDAI, the interest in DAI,\n * the amount which is not covered by precision of DAI, how much of the generated interest is donated\n */\n function collectUBIInterest(address _recipient)\n public\n onlyFundManager\n returns (\n uint256,\n uint256,\n uint256,\n uint32\n )\n {\n // otherwise fund manager has to wait for the next interval\n require(_recipient != address(this), \"Recipient cannot be the staking contract\");\n\n require(canCollect(), \"Need to wait for the next interval\");\n\n (\n uint256 cdaiGains,\n uint256 daiGains,\n uint256 precisionLossDai\n ) = currentUBIInterest();\n lastUBICollection = block.number.div(blockInterval);\n if (cdaiGains > 0)\n require(cDai.transfer(_recipient, cdaiGains), \"collect transfer failed\");\n emit InterestCollected(_recipient, cdaiGains, daiGains, precisionLossDai);\n return (cdaiGains, daiGains, precisionLossDai, avgInterestDonatedRatio);\n }\n\n /**\n * @dev Checks if enough blocks have passed so it would be possible to\n * execute `collectUBIInterest` according to the length of `blockInterval`\n * @return (bool) True if enough blocks have passed\n */\n function canCollect() public view returns (bool) {\n return block.number.div(blockInterval) > lastUBICollection;\n }\n\n /**\n * @dev Start function. Adds this contract to identity as a feeless scheme.\n * Can only be called if scheme is registered\n */\n function start() public onlyRegistered {\n addRights();\n }\n\n /**\n * @dev making the contract inactive\n * NOTICE: this could theoretically result in future interest earned in cdai to remain locked\n * but we dont expect any other stakers but us in SimpleDAIStaking\n */\n function end() public onlyAvatar {\n pause();\n removeRights();\n }\n\n /**\n * @dev method to recover any stuck erc20 tokens (ie compound COMP)\n * @param _token the ERC20 token to recover\n */\n function recover(ERC20 _token) public onlyAvatar {\n uint256 toWithdraw = _token.balanceOf(address(this));\n\n // recover left cDai(stakers token) only when all stakes have been withdrawn\n if (address(_token) == address(cDai)) {\n require(\n totalStaked == 0 && paused(),\n \"can recover cDai only when stakes have been withdrawn\"\n );\n }\n require(_token.transfer(address(avatar), toWithdraw), \"recover transfer 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