LibGuard

These functions are intended to prevent reentrancy attacks by ensuring that reentrant calls are not executed when the guarded flag is set. The guarded flag is controlled by these functions to enable or disable the reentrancy guard as needed.

enforcePreGuard():

This function is used to enforce a pre-reentrancy guard. It retrieves the AppStorage instance using LibMagpieAggregator.getStorage() and checks if the guarded flag is set. If the flag is already set, indicating an ongoing reentrant call, it reverts the transaction with a ReentrantCall error. Otherwise, it sets the guarded flag to true.

enforcePostGuard():

This function is used to enforce a post-reentrancy guard. It retrieves the AppStorage instance using LibMagpieAggregator.getStorage() and sets the guarded flag to false.

enforceDelegatedCallPreGuard():

Accesses the contract storage to determine if a specific type of delegated call is already in progress. If a call of that type is already in progress, it reverts the transaction to prevent reentrancy. If no such call is in progress, it sets the delegated call state to true for that call type.

Input:

Field	Type	Description
delegatedCallType	DelegatedCallType	enum DelegatedCallType { BridgeIn, BridgeOut, DataTransferIn, DataTransferOut }

enforceDelegatedCall():

Accesses the contract storage to confirm whether a particular type of delegated call is currently in progress. If the expected call is not in progress, it reverts the transaction, indicating an invalid delegated call.

enforceDelegatedCallPostGaurd():

Accesses the contract storage and sets the delegated call state back to false for the specified type of delegated call.

Input:

Field	Type
delegatedCallType	DelegatedCallType	enum DelegatedCallType { BridgeIn, BridgeOut, DataTransferIn, DataTransferOut }

enforceDelegatedCallGuard():

Accesses the contract storage to confirm whether a particular type of delegated call is currently in progress. If the expected call is not in progress, it reverts the transaction, indicating an invalid delegated call.

Input:

Field	Type	Description
delegatedCallType	DelegatedCallType	enum DelegatedCallType { BridgeIn, BridgeOut, DataTransferIn, DataTransferOut }