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DstSwapper
DstSwapper is an access controlled contract which executes transaction data when tokens must be swapped on the destination chain before being deposited into a vault. This typically occurs when the vault being deposited into has little bridge liquidity in the underlying asset. In this case, the more liquid token is sent to the DstSwapper contract rather than going directly to CoreStateRegistry. The contract also accounts for failed swaps, where the requested output of the swapped token on
DstSwapper falls below the user's intended amount they specified via Superform Vault Data.maxSlippage. If the swapped amount will be lower, the payload is marked as failed and the user can rescue their funds and make the swap themselves on the destination chain. There are three stages in which
DstSwapper handles actions on the destination chain. It first tries to swap via processTx, if not successful, the transaction is marked as failed via updateFailedTx, which means the intermediary tokens can be rescued by CoreStateRegistry. The core function in
DstSwapper is processTx. After validating that the provided data will send tokens to CoreStateRegistry, processTx calls the designated bridge address with the provided transaction data via the onlySwapper contract . This secures against txData manipulation by off-chain route generation. processTx will revert if the amount of the vault underlying token to be received was lower than what the user intended.function processTx(
uint256 payloadId_,
uint256 index_,
uint8 bridgeId_,
bytes calldata txData_
) external override onlySwapper nonReentrant
Name | Description |
|---|---|
payloadId_ | uint256 payload id to update |
indices_ | uint256 index of the superformId in the payload |
bridgeId_ | uint8 bridgeId that is being used for the swap |
txData_ | bytes txData being executed |
If
processTx doesn't go through successfully within a pre-determined time-frame (30 minutes being the default) transactions will be marked as failed via updateFailedTx.function updateFailedTx(
uint256 payloadId_,
uint256 index_,
address interimToken_,
uint256 amount_
) external override onlySwapper nonReentrant
Name | Description |
|---|---|
payloadId_ | uint256 payload id to update |
index_ | uint256 index of the superformId in the payload |
interimToken_ | address of the intermediary token that needs to be rescued |
amount_ | uint256 amount of the intermediary token that needs to be rescued |
Once transactions are marked as failed by swapper, they can be rescued by the rescue/dispute process conducted in CoreStateRegistry.
function processFailedTx(
address user_,
address interimToken_,
uint256 amount_
) external override onlyCoreStateRegistry
Name | Description |
|---|---|
user_ | address of the user to refund on the destination chain |
interimToken_ | address of the interim token that wasn't able to be swapped which the user is owed |
amount_ | uint256 amount of the intermediary token the user is owed |
Last modified 19d ago