ZetaDocs

GatewayEVM

Inherits: Initializable, AccessControlUpgradeable, UUPSUpgradeable, IGatewayEVM, ReentrancyGuardUpgradeable, PausableUpgradeable

The GatewayEVM contract is the endpoint to call smart contracts on external chains.

The contract doesn't hold any funds and should never have active allowances.

State Variables

custody

The address of the custody contract.

address public custody;

tssAddress

The address of the TSS (Threshold Signature Scheme) contract.

address public tssAddress;

zetaConnector

The address of the ZetaConnector contract.

address public zetaConnector;

zetaToken

The address of the Zeta token contract.

address public zetaToken;

TSS_ROLE

New role identifier for tss role.

bytes32 public constant TSS_ROLE = keccak256("TSS_ROLE");

ASSET_HANDLER_ROLE

New role identifier for asset handler role.

bytes32 public constant ASSET_HANDLER_ROLE = keccak256("ASSET_HANDLER_ROLE");

PAUSER_ROLE

New role identifier for pauser role.

bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

Functions

constructor

constructor();

initialize

Initialize with tss address. address of zeta token and admin account set as DEFAULT_ADMIN_ROLE.

Using admin to authorize upgrades and pause, and tss for tss role.

function initialize(address tssAddress_, address zetaToken_, address admin_) public initializer;

_authorizeUpgrade

Authorizes the upgrade of the contract, sender must be owner.

function _authorizeUpgrade(address newImplementation) internal override onlyRole(DEFAULT_ADMIN_ROLE);

Parameters

Name	Type	Description
`newImplementation`	`address`	Address of the new implementation.

updateTSSAddress

Update tss address

function updateTSSAddress(address newTSSAddress) external onlyRole(DEFAULT_ADMIN_ROLE);

Parameters

Name	Type	Description
`newTSSAddress`	`address`	new tss address

pause

Pause contract.

function pause() external onlyRole(PAUSER_ROLE);

unpause

Unpause contract.

function unpause() external onlyRole(PAUSER_ROLE);

executeRevert

Transfers msg.value to destination contract and executes it's onRevert function.

This function can only be called by the TSS address and it is payable.

function executeRevert(
    address destination,
    bytes calldata data,
    RevertContext calldata revertContext
)
    public
    payable
    onlyRole(TSS_ROLE)
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`destination`	`address`	Address to call.
`data`	`bytes`	Calldata to pass to the call.
`revertContext`	`RevertContext`

execute

Executes an authenticated call to a destination address without ERC20 tokens.

This function can only be called by the TSS address and it is payable.

function execute(
    MessageContext calldata messageContext,
    address destination,
    bytes calldata data
)
    external
    payable
    onlyRole(TSS_ROLE)
    whenNotPaused
    nonReentrant
    returns (bytes memory);

Parameters

Name	Type	Description
`messageContext`	`MessageContext`	Message context containing sender.
`destination`	`address`	Address to call.
`data`	`bytes`	Calldata to pass to the call.

Returns

Name	Type	Description
`<none>`	`bytes`	The result of the call.

execute

Executes an arbitrary call to a destination address without ERC20 tokens.

This function can only be called by the TSS address and it is payable.

function execute(
    address destination,
    bytes calldata data
)
    external
    payable
    onlyRole(TSS_ROLE)
    whenNotPaused
    returns (bytes memory);

Parameters

Name	Type	Description
`destination`	`address`	Address to call.
`data`	`bytes`	Calldata to pass to the call.

Returns

Name	Type	Description
`<none>`	`bytes`	The result of the call.

executeWithERC20

Executes a call to a destination contract using ERC20 tokens.

This function can only be called by the custody or connector address. It uses the ERC20 allowance system, resetting gateway allowance at the end.

function executeWithERC20(
    address token,
    address to,
    uint256 amount,
    bytes calldata data
)
    public
    onlyRole(ASSET_HANDLER_ROLE)
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`token`	`address`	Address of the ERC20 token.
`to`	`address`	Address of the contract to call.
`amount`	`uint256`	Amount of tokens to transfer.
`data`	`bytes`	Calldata to pass to the call.

revertWithERC20

Directly transfers ERC20 tokens and calls onRevert.

This function can only be called by the custody or connector address.

function revertWithERC20(
    address token,
    address to,
    uint256 amount,
    bytes calldata data,
    RevertContext calldata revertContext
)
    external
    onlyRole(ASSET_HANDLER_ROLE)
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`token`	`address`	Address of the ERC20 token.
`to`	`address`	Address of the contract to call.
`amount`	`uint256`	Amount of tokens to transfer.
`data`	`bytes`	Calldata to pass to the call.
`revertContext`	`RevertContext`	Revert context to pass to onRevert.

deposit

Deposits ETH to the TSS address.

function deposit(address receiver, RevertOptions calldata revertOptions) external payable whenNotPaused nonReentrant;

Parameters

Name	Type	Description
`receiver`	`address`	Address of the receiver.
`revertOptions`	`RevertOptions`	Revert options.

deposit

Deposits ERC20 tokens to the custody or connector contract.

function deposit(
    address receiver,
    uint256 amount,
    address asset,
    RevertOptions calldata revertOptions
)
    external
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`receiver`	`address`	Address of the receiver.
`amount`	`uint256`	Amount of tokens to deposit.
`asset`	`address`	Address of the ERC20 token.
`revertOptions`	`RevertOptions`	Revert options.

depositAndCall

Deposits ETH to the TSS address and calls an omnichain smart contract.

function depositAndCall(
    address receiver,
    bytes calldata payload,
    RevertOptions calldata revertOptions
)
    external
    payable
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`receiver`	`address`	Address of the receiver.
`payload`	`bytes`	Calldata to pass to the call.
`revertOptions`	`RevertOptions`	Revert options.

depositAndCall

Deposits ERC20 tokens to the custody or connector contract and calls an omnichain smart contract.

function depositAndCall(
    address receiver,
    uint256 amount,
    address asset,
    bytes calldata payload,
    RevertOptions calldata revertOptions
)
    external
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`receiver`	`address`	Address of the receiver.
`amount`	`uint256`	Amount of tokens to deposit.
`asset`	`address`	Address of the ERC20 token.
`payload`	`bytes`	Calldata to pass to the call.
`revertOptions`	`RevertOptions`	Revert options.

call

Calls an omnichain smart contract without asset transfer.

function call(
    address receiver,
    bytes calldata payload,
    RevertOptions calldata revertOptions
)
    external
    whenNotPaused
    nonReentrant;

Parameters

Name	Type	Description
`receiver`	`address`	Address of the receiver.
`payload`	`bytes`	Calldata to pass to the call.
`revertOptions`	`RevertOptions`	Revert options.

setCustody

Sets the custody contract address.

function setCustody(address custody_) external onlyRole(DEFAULT_ADMIN_ROLE);

Parameters

Name	Type	Description
`custody_`	`address`	Address of the custody contract.

setConnector

Sets the connector contract address.

function setConnector(address zetaConnector_) external onlyRole(DEFAULT_ADMIN_ROLE);

Parameters

Name	Type	Description
`zetaConnector_`	`address`	Address of the connector contract.

resetApproval

Resets the approval of a token for a specified address. This is used to ensure that the approval is set to zero before setting it to a new value.

function resetApproval(address token, address to) private returns (bool);

Parameters

Name	Type	Description
`token`	`address`	Address of the ERC20 token.
`to`	`address`	Address to reset the approval for.

Returns

Name	Type	Description
`<none>`	`bool`	True if the approval reset was successful, false otherwise.

transferFromToAssetHandler

Transfers tokens from the sender to the asset handler. This function handles the transfer of tokens to either the connector or custody contract based on the asset type.

function transferFromToAssetHandler(address from, address token, uint256 amount) private;

Parameters

Name	Type	Description
`from`	`address`	Address of the sender.
`token`	`address`	Address of the ERC20 token.
`amount`	`uint256`	Amount of tokens to transfer.

transferToAssetHandler

Transfers tokens to the asset handler. This function handles the transfer of tokens to either the connector or custody contract based on the asset type.

function transferToAssetHandler(address token, uint256 amount) private;

Parameters

Name	Type	Description
`token`	`address`	Address of the ERC20 token.
`amount`	`uint256`	Amount of tokens to transfer.

_executeArbitraryCall

Private function to execute an arbitrary call to a destination address.

function _executeArbitraryCall(address destination, bytes calldata data) private returns (bytes memory);

Parameters

Name	Type	Description
`destination`	`address`	Address to call.
`data`	`bytes`	Calldata to pass to the call.

Returns

Name	Type	Description
`<none>`	`bytes`	The result of the call.

_executeAuthenticatedCall

Private function to execute an authenticated call to a destination address.

function _executeAuthenticatedCall(
    MessageContext calldata messageContext,
    address destination,
    bytes calldata data
)
    private
    returns (bytes memory);

Parameters

Name	Type	Description
`messageContext`	`MessageContext`	Message context containing sender and arbitrary call flag.
`destination`	`address`	Address to call.
`data`	`bytes`	Calldata to pass to the call.

Returns

Name	Type	Description
`<none>`	`bytes`	The result of the call.

revertIfOnCallOrOnRevert

function revertIfOnCallOrOnRevert(bytes calldata data) private pure;