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feat(contracts/core): start solve inbox
Start solve inbox prototype. Introduce single Inbox.request() method.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,114 @@ | ||
| // SPDX-License-Identifier: GPL-3.0-only | ||
| pragma solidity =0.8.24; | ||
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| import { ReentrancyGuardUpgradeable } from "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol"; | ||
| import { SafeERC20, IERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; | ||
| import { Solve } from "./Solve.sol"; | ||
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| /** | ||
| * @title Inbox | ||
| * @notice Entrypoint and alt-mempoool for user solve requests. | ||
| */ | ||
| contract Inbox is ReentrancyGuardUpgradeable { | ||
| using SafeERC20 for IERC20; | ||
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| error NoDeposits(); | ||
| error InvalidCall(); | ||
| error InvalidDeposit(); | ||
| error ZeroDeposit(); | ||
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| /** | ||
| * @notice Emitted when a request is created. | ||
| * @param id ID of the request. | ||
| * @param from Address of the user who created the request. | ||
| * @param call Details of the call to be executed on another chain. | ||
| * @param deposits Array of deposits backing the request. | ||
| */ | ||
| event Requested(bytes32 indexed id, address indexed from, Solve.Call call, Solve.Deposit[] deposits); | ||
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| /** | ||
| * @dev uint repr of last assigned request ID. | ||
| */ | ||
| uint256 internal _lastId; | ||
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| /** | ||
| * @notice Map ID to request. | ||
| */ | ||
| mapping(bytes32 id => Solve.Request) internal _requests; | ||
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| function initialize() public initializer { | ||
| __ReentrancyGuard_init(); | ||
| } | ||
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| /** | ||
| * @notice Returns the request with the given ID. | ||
| */ | ||
| function getRequest(bytes32 id) external view returns (Solve.Request memory) { | ||
| return _requests[id]; | ||
| } | ||
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| /** | ||
| * @notice Open a request to execute a call on another chain, backed by deposits. | ||
| * Token deposits are transferred from msg.sender to this inbox. | ||
| * @param call Details of the call to be executed on another chain. | ||
| * @param deposits Array of deposits backing the request. | ||
| */ | ||
| function request(Solve.Call calldata call, Solve.TokenDeposit[] calldata deposits) | ||
| external | ||
| payable | ||
| nonReentrant | ||
| returns (bytes32 id) | ||
| { | ||
| if (call.target == address(0)) revert InvalidCall(); | ||
| if (call.destChainId == 0) revert InvalidCall(); | ||
| if (call.data.length == 0) revert InvalidCall(); | ||
| if (deposits.length == 0 && msg.value == 0) revert NoDeposits(); | ||
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| Solve.Request storage req = _openRequest(msg.sender, call, deposits); | ||
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| emit Requested(req.id, req.from, req.call, req.deposits); | ||
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| return req.id; | ||
| } | ||
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| /** | ||
| * @dev Open a new request in storage at `id`. | ||
| * Transfer token deposits from msg.sender to this inbox. | ||
| * Duplicate token addresses are allowed. | ||
| */ | ||
| function _openRequest(address from, Solve.Call calldata call, Solve.TokenDeposit[] calldata deposits) | ||
| internal | ||
| returns (Solve.Request storage req) | ||
| { | ||
| bytes32 id = _nextId(); | ||
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| req = _requests[id]; | ||
| req.id = id; | ||
| req.updatedAt = uint40(block.timestamp); | ||
| req.from = from; | ||
| req.call = call; | ||
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| if (msg.value > 0) { | ||
| req.deposits.push(Solve.Deposit({ isNative: true, token: address(0), amount: msg.value })); | ||
| } | ||
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| for (uint256 i = 0; i < deposits.length; i++) { | ||
| if (deposits[i].amount == 0) revert InvalidDeposit(); | ||
| if (deposits[i].token == address(0)) revert InvalidDeposit(); | ||
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| req.deposits.push(Solve.Deposit({ isNative: false, token: deposits[i].token, amount: deposits[i].amount })); | ||
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| // NOTE: all external methods must be nonReentrant | ||
| // This allows us to transfer while opening the request - saving some gas. | ||
| IERC20(deposits[i].token).safeTransferFrom(msg.sender, address(this), deposits[i].amount); | ||
| } | ||
| } | ||
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| /** | ||
| * @dev Increment and return _lastId. | ||
| */ | ||
| function _nextId() internal returns (bytes32) { | ||
| _lastId++; | ||
| return bytes32(_lastId); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,70 @@ | ||
| // SPDX-License-Identifier: GPL-3.0-only | ||
| pragma solidity =0.8.24; | ||
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| library Solve { | ||
| enum Status { | ||
| Open, | ||
| Accepted, | ||
| Cancelled, | ||
| Rejected, | ||
| Fulfilled, | ||
| Paid | ||
| } | ||
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| /** | ||
| * @notice A request to execute a call on another chain, backed by a deposit. | ||
| * @param id ID for the request, globally unique per inbox. | ||
| * @param updatedAt Timestamp request status was last updated. | ||
| * @param from Address of the user who created the request. | ||
| * @param fulfilledBy Address of the solver that fulfilled the request. | ||
| * @param status Request status (open, accepted, cancelled, rejected, fulfilled, paid). | ||
| * @param call Details of the call to be executed on another chain. | ||
| * @param deposits Array of deposits backing the request. | ||
| */ | ||
| struct Request { | ||
| bytes32 id; | ||
| uint40 updatedAt; | ||
| Status status; | ||
| address from; | ||
| address fulfilledBy; | ||
| Call call; | ||
| Deposit[] deposits; | ||
| } | ||
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| /** | ||
| * @notice Details of a call to be executed on another chain. | ||
| * @param destChainId ID of the destination chain. | ||
| * @param value Amount of native currency to send with the call. | ||
| * @param target Address of the target contract on the destination chain. | ||
| * @param data Encoded data to be sent with the call. | ||
| */ | ||
| struct Call { | ||
| uint64 destChainId; | ||
| address target; | ||
| uint256 value; | ||
| bytes data; | ||
| } | ||
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| /** | ||
| * @notice Details of a deposit backing a request. | ||
| * @param isNative Whether the deposit is in native currency. | ||
| * @param token Address of the token, address(0) if native. | ||
| * @param amount Deposit amount. | ||
| */ | ||
| struct Deposit { | ||
| bool isNative; | ||
| address token; | ||
| uint256 amount; | ||
| } | ||
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| /** | ||
| * @notice Details of a token deposit backing a request. | ||
| * @dev Not stored, only used in opening a request. | ||
| * @param token Address of the token. | ||
| * @param amount Deposit amount. | ||
| */ | ||
| struct TokenDeposit { | ||
| address token; | ||
| uint256 amount; | ||
| } | ||
| } |
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