106 lines
3.3 KiB
Solidity
106 lines
3.3 KiB
Solidity
// SPDX-License-Identifier: BUSL-1.1
|
|
pragma solidity ^0.8.26;
|
|
|
|
import "@interfaces/IExecutor.sol";
|
|
import "@interfaces/ICallback.sol";
|
|
|
|
error Dispatcher__UnapprovedExecutor();
|
|
error Dispatcher__NonContractExecutor();
|
|
error Dispatcher__InvalidDataLength();
|
|
|
|
/**
|
|
* @title Dispatcher - Dispatch execution to external contracts
|
|
* @author PropellerHeads Devs
|
|
* @dev Provides the ability to delegate execution of swaps to external
|
|
* contracts. This allows dynamically adding new supported protocols
|
|
* without needing to upgrade any contracts. External contracts will
|
|
* be called using delegatecall so they can share state with the main
|
|
* contract if needed.
|
|
*
|
|
* Note: Executor contracts need to implement the IExecutor interface unless
|
|
* an alternate selector is specified.
|
|
*/
|
|
contract Dispatcher {
|
|
mapping(address => bool) public executors;
|
|
|
|
event ExecutorSet(address indexed executor);
|
|
event ExecutorRemoved(address indexed executor);
|
|
|
|
/**
|
|
* @dev Adds or replaces an approved executor contract address if it is a
|
|
* contract.
|
|
* @param target address of the executor contract
|
|
*/
|
|
function _setExecutor(address target) internal {
|
|
if (target.code.length == 0) {
|
|
revert Dispatcher__NonContractExecutor();
|
|
}
|
|
executors[target] = true;
|
|
emit ExecutorSet(target);
|
|
}
|
|
|
|
/**
|
|
* @dev Removes an approved executor contract address
|
|
* @param target address of the executor contract
|
|
*/
|
|
function _removeExecutor(address target) internal {
|
|
delete executors[target];
|
|
emit ExecutorRemoved(target);
|
|
}
|
|
|
|
/**
|
|
* @dev Calls an executor, assumes swap.protocolData contains
|
|
* protocol-specific data required by the executor.
|
|
*/
|
|
// slither-disable-next-line delegatecall-loop
|
|
function _callExecutor(
|
|
address executor,
|
|
uint256 amount,
|
|
bytes calldata data
|
|
) internal returns (uint256 calculatedAmount) {
|
|
if (!executors[executor]) {
|
|
revert Dispatcher__UnapprovedExecutor();
|
|
}
|
|
|
|
// slither-disable-next-line controlled-delegatecall,low-level-calls
|
|
(bool success, bytes memory result) = executor.delegatecall(
|
|
abi.encodeWithSelector(IExecutor.swap.selector, amount, data)
|
|
);
|
|
|
|
if (!success) {
|
|
revert(
|
|
string(
|
|
result.length > 0
|
|
? result
|
|
: abi.encodePacked("Execution failed")
|
|
)
|
|
);
|
|
}
|
|
|
|
calculatedAmount = abi.decode(result, (uint256));
|
|
}
|
|
|
|
function _handleCallback(bytes calldata data) internal {
|
|
address executor = address(uint160(bytes20(data[data.length - 20:])));
|
|
|
|
if (!executors[executor]) {
|
|
revert Dispatcher__UnapprovedExecutor();
|
|
}
|
|
|
|
// slither-disable-next-line controlled-delegatecall,low-level-calls
|
|
(bool success, bytes memory result) = executor.delegatecall(
|
|
abi.encodeWithSelector(ICallback.handleCallback.selector, data)
|
|
);
|
|
|
|
if (!success) {
|
|
revert(
|
|
string(
|
|
result.length > 0
|
|
? result
|
|
: abi.encodePacked("Callback failed")
|
|
)
|
|
);
|
|
}
|
|
}
|
|
}
|