Vault Interfaces

IStrategy

Source code: yearn-protocol/develop/interfaces/yearn/IStrategy.sol

function want()

Returns the address of the unwrapped token that the Strategy takes as deposit.

Solidity

function want() external view returns (address);

		type	desc
Output	0	address	Address of the token the Strategy takes as deposit

function deposit()

Deposits token (same as want() returns) into a smart contact specified by the Strategy.

Solidity

function deposit() external;

func withdraw(address)

Dust collecting function to create additional rewards out of tokens that were incorrectly sent to the Strategy.

Takes an ERC20 token address and should send the full amount of any such tokens in the Strategy to the Controller.

This function should have access control enforcing the Controller only to be its allowed caller, and checks in place to ensure that the token types to withdraw are not those used by the Strategy.

Solidity

function withdraw(address) external;

		type	desc
Input	0	address	ERC-20 token to be drained

function withdraw(uint256)

Partially withdraws funds (denominated in want() token) from the Strategy, and should always only be sending these to the Vault. In case the Strategy implements harvest(), a withdrawal fee may be applied. This function should have access control enforcing the Controller only to be its allowed caller.

Solidity

function withdraw(uint256) external;

		type	desc
Input	0	uint	Amount to be withdrawn

function skim()

Used to obtain the remaining amount that can be borrowed from the lending platform. Relevant when the Strategy implements a lending platform, such as Aave.

Solidity

function skim() external;

function withdrawAll()

Withdraws the entire amount of want() tokens available, and should always only be sending these to the Vault. This function should have access control enforcing the Controller only to be its allowed caller. Typically used when migrating strategies.

The function typically uses withdraw() and performs a set of sequential function calls depending on the Strategy.

If the Strategy implements liquidity pools or lending platforms, then withdrawal from these platforms should be performed until the Vault’s unwrapped token is delivered back to the vault.

Returns a uint256 of the total amount withdrawn.

Solidity

function withdrawAll() external returns (uint256);

		type	desc
Output	0	uint256	The amount withdrawn

function balanceOf()

Returns the Strategy's current want() token balance.

Solidity

function balanceOf() external view returns (uint256);

		type	desc
Output	0	uint256	Strategy's want() token balance

IVault

Source code: yearn-protocol/develop/interfaces/yearn/IVault.sol

function token()

Returns the unwrapped native token address that the Vault takes as deposit.

Solidity

function token() external view returns (address);

		type	desc
Output	0	address	Vault’s unwrapped native token address

function underlying()

Returns the native underlying token address in Delegated Vaults. For example, in case of aLINK delegated vault, underlying() returns the address of the LINK token.

Solidity

// This is only implemented in Delegated Vaults.
function underlying() external view returns (address);

		type	desc
Output	0	address	Delegated Vault’s underlying native token address

function name()

Returns the vault’s wrapped token name as a string, e.g. “yearn Dai Stablecoin".

Solidity

function name() external view returns (string memory);

		type	desc
Output	0	string	Vault’s wrapped token name

function symbol()

Returns the vault’s wrapped token symbol as a string, e.g. “yDai”.

Solidity

function symbol() external view returns (string memory);

		type	desc
Output	0	string	Vault’s wrapped token symbol

function decimals()

Returns the amount of decimals for this vault’s wrapped token as a uint8.

Solidity

function decimals() external view returns (uint8);

		type	desc
Output	0	uint8	No of decimals of the vault's wrapped token.

func controller()

Returns the address of the Vault's Controller.

Solidity

function controller() external view returns (address);

		type	desc
Output	0	address	Vault’s Controller contract

function governance()

Returns the address of the Vault’s governance contract.

Solidity

function governance() external view returns (address);

		type	desc
Output	0	address	Vault’s Governance contract

function getPricePerFullShare()

Returns the price of the Vault’s wrapped token, denominated in the unwrapped native token.

The calculation is:

$${nativeTokenBalance \over yTokenTotalSupply}$$

Where nativeTokenBalance is the current balance of native token (e.g. DAI) in the Vault, Controller and Strategy contracts. And yTokenTotalSupply is the total supply of the Vault's wrapped Token (e.g. yDAI).

Solidity

function getPricePerFullShare() external view returns (uint256);

		type	desc
Output	0	uint256	Price of the Vault’s wrapped token denominated in the unwrapped native token

function deposit()

Deposits the specified amount of the native unwrapped token (same as token() returns) into the Vault.

Solidity

function deposit(uint256) external;

		type	desc
Input	0	uint256	Amount to deposit into the Vault.

function depositAll()

Deposits the maximum available amount of the native unwrapped token (same as token() returns) into the Vault.

Solidity

function depositAll() external;

function withdraw()

Withdraws the specified amount of the native unwrapped token (same as token() returns) from the Vault.

Solidity

function withdraw(uint256) external;

		type	desc
Input	0	uint256	Amount to withdraw from the Vault.

function withdrawAll()

Withdraws the maximum available amount of the native unwrapped token (same as token() returns) from the Vault.

Solidity

function withdrawAll() external;

IController

Source code: yearn-protocol/develop/interfaces/yearn/IController.sol

function withdraw()

Calls Strategy.withdraw() function for the amount defined in unit256 in the Strategy of the specified address. This function should have access control enforcing the Vault to be its only allowed caller.

Solidity

function withdraw(address, uint256) external;

		type	desc
Input	0	address	Address of the Strategy to withdraw from
Input	1	uint256	Amount to withdraw

function balanceOf()

Returns the Strategy's balance of the specified token.

Solidity

function balanceOf(address) external view returns (uint256);

		type	desc
Input	0	address	Token that is used in the Strategy
Output	0	uint256	Balance of the specified token

function earn()

Transfers the profits earned from the yield generating activities of the Strategy to the Vault. Takes an address of a token to withdraw and an amount.

Solidity

function earn(address, uint256) external;

		type	desc
Input	0	address	Token to be withdrawn to the Vault from the Strategy
Input	1	uint256	Amount to be withdrawn

function want()

Not used by the currently deployed controller. Please refer to Strategy.want() instead.

Solidity

function want(address) external view returns (address);

function rewards()

Returns the address of the Treasury which is where the system reward fees go.

Solidity

function rewards() external view returns (address);

		type	desc
Output	0	address	Treasury contract

function vaults()

Takes a token address and returns the corresponding Vault address.

Solidity

function vaults(address) external view returns (address);

		type	desc
Input	0	address	Token to find a Vault address for
Output	0	address	Vault address that is associated with the specified token

function strategies()

Takes a token address and returns the corresponding Strategy address.

Solidity

function strategies(address) external view returns (address);

		type	desc
Input	0	address	Token to find a Strategy address for
Output	0	address	Strategy address that is associated with the specified token