THORChain_Router
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The following smart contract is the THORChain_Router contract, which is responsible for handling deposits, transfers, and allowances of assets between different vaults and routers in the THORChain network. It includes functions for depositing assets, transferring allowances, transferring assets out, and returning vault assets. The contract also includes a non-reentrant modifier to prevent reentrancy attacks.
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## Public Information - `RUNE`: a public variable of type `address` that represents the address of the RUNE token. - `vaultAllowance`: a public function that takes two parameters `vault` and `token` and returns the allowance of the given `token` for the given `vault`. ## Public or external functions - `depositWithExpiry`: an external function that takes four parameters `vault`, `asset`, `amount`, `memo`, and `expiration`. It allows users to deposit assets into the given `vault` with an expiration time. - `deposit`: a public function that takes three parameters `vault`, `asset`, `amount`, and `memo`. It allows users to deposit assets into the given `vault`. - `transferAllowance`: an external function that takes four parameters `router`, `newVault`, `asset`, `amount`, and `memo`. It allows users to transfer the allowance of the given `asset` from the current `vault` to the new `vault`. - `transferOut`: a public function that takes four parameters `to`, `asset`, `amount`, and `memo`. It allows users to transfer the given `asset` to the given `to` address. - `transferOutAndCall`: a public function that takes four parameters `aggregator`, `finalToken`, `to`, `amountOutMin`, and `memo`. It allows users to transfer the given `aggregator` to the given `to` address and call the `swapOut` function with the given `finalToken` and `amountOutMin`. - `returnVaultAssets`: an external function that takes four parameters `router`, `asgard`, `coins`, and `memo`. It allows users to return the given `coins` to the given `asgard` address. ## Events - `Deposit`: an event that is emitted when a user deposits assets into the given `vault`. - `TransferOut`: an event that is emitted when a user transfers the given `asset` to the given `to` address. - `TransferOutAndCall`: an event that is emitted when a user transfers the given `aggregator` to the given `to` address and calls the `swapOut` function with the given `finalToken` and `amountOutMin`. - `TransferAllowance`: an event that is emitted when a user transfers the allowance of the given `asset` from the current `vault` to the new `vault`. - `VaultTransfer`: an event that is emitted when a user returns the given `coins` to the given `asgard` address. ## Inherits This contract does not inherit from any other contract.
## Public Information
- `RUNE`: a public variable of type `address` that represents the address of the RUNE token.
- `vaultAllowance`: a public function that takes two parameters `vault` and `token` and returns the allowance of the given `token` for the given `vault`.
## Public or external functions
- `depositWithExpiry`: an external function that takes four parameters `vault`, `asset`, `amount`, `memo`, and `expiration`. It allows users to deposit assets into the given `vault` with an expiration time.
- `deposit`: a public function that takes three parameters `vault`, `asset`, `amount`, and `memo`. It allows users to deposit assets into the given `vault`.
- `transferAllowance`: an external function that takes four parameters `router`, `newVault`, `asset`, `amount`, and `memo`. It allows users to transfer the allowance of the given `asset` from the current `vault` to the new `vault`.
- `transferOut`: a public function that takes four parameters `to`, `asset`, `amount`, and `memo`. It allows users to transfer the given `asset` to the given `to` address.
- `transferOutAndCall`: a public function that takes four parameters `aggregator`, `finalToken`, `to`, `amountOutMin`, and `memo`. It allows users to transfer the given `aggregator` to the given `to` address and call the `swapOut` function with the given `finalToken` and `amountOutMin`.
- `returnVaultAssets`: an external function that takes four parameters `router`, `asgard`, `coins`, and `memo`. It allows users to return the given `coins` to the given `asgard` address.
## Events
- `Deposit`: an event that is emitted when a user deposits assets into the given `vault`.
- `TransferOut`: an event that is emitted when a user transfers the given `asset` to the given `to` address.
- `TransferOutAndCall`: an event that is emitted when a user transfers the given `aggregator` to the given `to` address and calls the `swapOut` function with the given `finalToken` and `amountOutMin`.
- `TransferAllowance`: an event that is emitted when a user transfers the allowance of the given `asset` from the current `vault` to the new `vault`.
- `VaultTransfer`: an event that is emitted when a user returns the given `coins` to the given `asgard` address.
## Inherits
This contract does not inherit from any other contract.
- `RUNE`: a public variable of type `address` that represents the address of the RUNE token.
- `vaultAllowance`: a public function that takes two parameters `vault` and `token` and returns the allowance of the given `token` for the given `vault`.
## Public or external functions
- `depositWithExpiry`: an external function that takes four parameters `vault`, `asset`, `amount`, `memo`, and `expiration`. It allows users to deposit assets into the given `vault` with an expiration time.
- `deposit`: a public function that takes three parameters `vault`, `asset`, `amount`, and `memo`. It allows users to deposit assets into the given `vault`.
- `transferAllowance`: an external function that takes four parameters `router`, `newVault`, `asset`, `amount`, and `memo`. It allows users to transfer the allowance of the given `asset` from the current `vault` to the new `vault`.
- `transferOut`: a public function that takes four parameters `to`, `asset`, `amount`, and `memo`. It allows users to transfer the given `asset` to the given `to` address.
- `transferOutAndCall`: a public function that takes four parameters `aggregator`, `finalToken`, `to`, `amountOutMin`, and `memo`. It allows users to transfer the given `aggregator` to the given `to` address and call the `swapOut` function with the given `finalToken` and `amountOutMin`.
- `returnVaultAssets`: an external function that takes four parameters `router`, `asgard`, `coins`, and `memo`. It allows users to return the given `coins` to the given `asgard` address.
## Events
- `Deposit`: an event that is emitted when a user deposits assets into the given `vault`.
- `TransferOut`: an event that is emitted when a user transfers the given `asset` to the given `to` address.
- `TransferOutAndCall`: an event that is emitted when a user transfers the given `aggregator` to the given `to` address and calls the `swapOut` function with the given `finalToken` and `amountOutMin`.
- `TransferAllowance`: an event that is emitted when a user transfers the allowance of the given `asset` from the current `vault` to the new `vault`.
- `VaultTransfer`: an event that is emitted when a user returns the given `coins` to the given `asgard` address.
## Inherits
This contract does not inherit from any other contract.
// SPDX-License-Identifier: MIT
// -------------------
// Router Version: 4.1
// -------------------
pragma solidity 0.8.13;
// ERC20 Interface
interface iERC20 {
function balanceOf(address) external view returns (uint256);
function burn(uint) external;
}
// RUNE Interface
interface iRUNE {
function transferTo(address, uint) external returns (bool);
}
// ROUTER Interface
interface iROUTER {
function depositWithExpiry(address, address, uint, string calldata, uint) external;
}
// THORChain_Router is managed by THORChain Vaults
contract THORChain_Router {
address public RUNE;
struct Coin {
address asset;
uint amount;
}
// Vault allowance for each asset
mapping(address => mapping(address => uint)) private _vaultAllowance;
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
// Emitted for all deposits, the memo distinguishes for swap, add, remove, donate etc
event Deposit(address indexed to, address indexed asset, uint amount, string memo);
// Emitted for all outgoing transfers, the vault dictates who sent it, memo used to track.
event TransferOut(address indexed vault, address indexed to, address asset, uint amount, string memo);
// Emitted for all outgoing transferAndCalls, the vault dictates who sent it, memo used to track.
event TransferOutAndCall(address indexed vault, address target, uint amount, address finalAsset, address to, uint256 amountOutMin, string memo);
// Changes the spend allowance between vaults
event TransferAllowance(address indexed oldVault, address indexed newVault, address asset, uint amount, string memo);
// Specifically used to batch send the entire vault assets
event VaultTransfer(address indexed oldVault, address indexed newVault, Coin[] coins, string memo);
modifier nonReentrant() {
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
_status = _ENTERED;
_;
_status = _NOT_ENTERED;
}
constructor(address rune) {
RUNE = rune;
_status = _NOT_ENTERED;
}
// Deposit with Expiry (preferred)
function depositWithExpiry(address payable vault, address asset, uint amount, string memory memo, uint expiration) external payable {
require(block.timestamp < expiration, "THORChain_Router: expired");
deposit(vault, asset, amount, memo);
}
// Deposit an asset with a memo. ETH is forwarded, ERC-20 stays in ROUTER
function deposit(address payable vault, address asset, uint amount, string memory memo) public payable nonReentrant{
uint safeAmount;
if(asset == address(0)){
safeAmount = msg.value;
bool success = vault.send(safeAmount);
require(success);
} else {
require(msg.value == 0, "THORChain_Router: unexpected eth"); // protect user from accidentally locking up eth
if(asset == RUNE) {
safeAmount = amount;
iRUNE(RUNE).transferTo(address(this), amount);
iERC20(RUNE).burn(amount);
} else {
safeAmount = safeTransferFrom(asset, amount); // Transfer asset
_vaultAllowance[vault][asset] += safeAmount; // Credit to chosen vault
}
}
emit Deposit(vault, asset, safeAmount, memo);
}
//############################## ALLOWANCE TRANSFERS ##############################
// Use for "moving" assets between vaults (asgard<>ygg), as well "churning" to a new Asgard
function transferAllowance(address router, address newVault, address asset, uint amount, string memory memo) external nonReentrant {
if (router == address(this)){
_adjustAllowances(newVault, asset, amount);
emit TransferAllowance(msg.sender, newVault, asset, amount, memo);
} else {
_routerDeposit(router, newVault, asset, amount, memo);
}
}
//############################## ASSET TRANSFERS ##############################
// Any vault calls to transfer any asset to any recipient.
// Note: Contract recipients of ETH are only given 2300 Gas to complete execution.
function transferOut(address payable to, address asset, uint amount, string memory memo) public payable nonReentrant {
uint safeAmount;
if(asset == address(0)){
safeAmount = msg.value;
bool success = to.send(safeAmount); // Send ETH.
if (!success) {
payable(address(msg.sender)).transfer(safeAmount); // For failure, bounce back to vault & continue.
}
} else {
_vaultAllowance[msg.sender][asset] -= amount; // Reduce allowance
(bool success, bytes memory data) = asset.call(abi.encodeWithSignature("transfer(address,uint256)" , to, amount));
require(success && (data.length == 0 || abi.decode(data, (bool))));
safeAmount = amount;
}
emit TransferOut(msg.sender, to, asset, safeAmount, memo);
}
// Any vault calls to transferAndCall on a target contract that conforms with "swapOut(address,address,uint256)"
// Example Memo: "1b3:ETH.0xFinalToken:0xTo:"
// Aggregator is matched to the last three digits of whitelisted aggregators
// FinalToken, To, amountOutMin come from originating memo
// Memo passed in here is the "OUT:HASH" type
function transferOutAndCall(address payable aggregator, address finalToken, address to, uint256 amountOutMin, string memory memo) public payable nonReentrant {
uint256 _safeAmount = msg.value;
(bool erc20Success, ) = aggregator.call{value:_safeAmount}(abi.encodeWithSignature("swapOut(address,address,uint256)", finalToken, to, amountOutMin));
if (!erc20Success) {
bool ethSuccess = payable(to).send(_safeAmount); // If can't swap, just send the recipient the ETH
if (!ethSuccess) {
payable(address(msg.sender)).transfer(_safeAmount); // For failure, bounce back to vault & continue.
}
}
emit TransferOutAndCall(msg.sender, aggregator, _safeAmount, finalToken, to, amountOutMin, memo);
}
//############################## VAULT MANAGEMENT ##############################
// A vault can call to "return" all assets to an asgard, including ETH.
function returnVaultAssets(address router, address payable asgard, Coin[] memory coins, string memory memo) external payable nonReentrant {
if (router == address(this)){
for(uint i = 0; i < coins.length; i++){
_adjustAllowances(asgard, coins[i].asset, coins[i].amount);
}
emit VaultTransfer(msg.sender, asgard, coins, memo); // Does not include ETH.
} else {
for(uint i = 0; i < coins.length; i++){
_routerDeposit(router, asgard, coins[i].asset, coins[i].amount, memo);
}
}
bool success = asgard.send(msg.value);
require(success);
}
//############################## HELPERS ##############################
function vaultAllowance(address vault, address token) public view returns(uint amount){
return _vaultAllowance[vault][token];
}
// Safe transferFrom in case asset charges transfer fees
function safeTransferFrom(address _asset, uint _amount) internal returns(uint amount) {
uint _startBal = iERC20(_asset).balanceOf(address(this));
(bool success, bytes memory data) = _asset.call(abi.encodeWithSignature("transferFrom(address,address,uint256)", msg.sender, address(this), _amount));
require(success && (data.length == 0 || abi.decode(data, (bool))));
return (iERC20(_asset).balanceOf(address(this)) - _startBal);
}
// Decrements and Increments Allowances between two vaults
function _adjustAllowances(address _newVault, address _asset, uint _amount) internal {
_vaultAllowance[msg.sender][_asset] -= _amount;
_vaultAllowance[_newVault][_asset] += _amount;
}
// Adjust allowance and forwards funds to new router, credits allowance to desired vault
function _routerDeposit(address _router, address _vault, address _asset, uint _amount, string memory _memo) internal {
_vaultAllowance[msg.sender][_asset] -= _amount;
(bool success,) = _asset.call(abi.encodeWithSignature("approve(address,uint256)", _router, _amount)); // Approve to transfer
require(success);
iROUTER(_router).depositWithExpiry(_vault, _asset, _amount, _memo, type(uint).max); // Transfer by depositing
}
}
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