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Reentrancy protection with optional parameter #3

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Reentrancy protection with optional parameter #3

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13 changes: 13 additions & 0 deletions src/TransientContext.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,19 @@ library TransientContext {
/// Equal to bytes32(uint256(keccak256("transient.calldepth")) - 1).
bytes32 internal constant CALL_DEPTH_SLOT = 0x7a74fd168763fd280eaec3bcd2fd62d0e795027adc8183a693c497a7c2b10b5c;

/// @notice Reentrancy modifier that gives inheritance flexibility automatically.
/// bytes32 key is used to create separate locks, which do not interfere with each other to ensure atomic access.
modifier nonreentrant(bytes32 key) {
assembly {
if tload(key) { revert(0, 0) }
tstore(key, 1)
}
_;
assembly {
tstore(key, 0)
}
}

/// @notice Gets the call depth.
/// @return callDepth_ Current call depth.
function callDepth() internal view returns (uint256 callDepth_) {
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