SafeToken.sol

View Source: contracts/SafeToken.sol

↗ Extends: ErrorReporter ↘ Derived Contracts: AlkemiEarnPublic, AlkemiEarnVerified, Liquidator

Functions

• checkTransferIn(address asset, address from, uint256 amount)

• doTransferIn(address asset, address from, uint256 amount)

• getCash(address asset)

• getBalanceOf(address asset, address from)

• doTransferOut(address asset, address to, uint256 amount)

• doApprove(address asset, address to, uint256 amount)

checkTransferIn

Checks whether or not there is sufficient allowance for this contract to move amount from from and whether or not from has a balance of at least amount. Does NOT do a transfer.

function checkTransferIn(address asset, address from, uint256 amount) internal view
returns(enum ErrorReporter.Error)

Arguments

Name	Type	Description
asset	address
from	address
amount	uint256

doTransferIn

Similar to EIP20 transfer, except it handles a False result from transferFrom and returns an explanatory error code rather than reverting. If caller has not called checkTransferIn, this may revert due to insufficient balance or insufficient allowance. If caller has called checkTransferIn prior to this call, and it returned Error.NO_ERROR, this should not revert in normal conditions.

• Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.

  See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca

function doTransferIn(address asset, address from, uint256 amount) internal nonpayable
returns(enum ErrorReporter.Error)

Arguments

Name	Type	Description
asset	address
from	address
amount	uint256

getCash

Checks balance of this contract in asset

function getCash(address asset) internal view
returns(uint256)

Arguments

Name	Type	Description
asset	address

getBalanceOf

Checks balance of from in asset

function getBalanceOf(address asset, address from) internal view
returns(uint256)

Arguments

Name	Type	Description
asset	address
from	address

doTransferOut

Similar to EIP20 transfer, except it handles a False result from transfer and returns an explanatory error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified it is >= amount, this should not revert in normal conditions.

• Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.

  See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca

function doTransferOut(address asset, address to, uint256 amount) internal nonpayable
returns(enum ErrorReporter.Error)

Arguments

Name	Type	Description
asset	address
to	address
amount	uint256

doApprove

function doApprove(address asset, address to, uint256 amount) internal nonpayable
returns(enum ErrorReporter.Error)

Arguments

Name	Type	Description
asset	address
to	address
amount	uint256