# TermDiscountRateAdapter.sol#TermDiscountRateAdapter

[Git Source](https://github.com/term-finance/yearn-v3-term-vault/blob/fdab68ac51eb0929f23686f72922fed45a3d7d1d/src/TermDiscountRateAdapter.sol)

**Inherits:** [ITermDiscountRateAdapter](https://github.com/term-finance/term-finance-developer-docs/blob/main/src/interfaces/term/ITermDiscountRateAdapter.sol/interface.ITermDiscountRateAdapter.md), AccessControl

## State Variables

### ORACLE\_ROLE

```solidity
bytes32 public constant ORACLE_ROLE = keccak256("ORACLE_ROLE");
```

### prevTermController

*Previous term controller*

```solidity
ITermController public prevTermController;
```

### currTermController

*Current term controller*

```solidity
ITermController public currTermController;
```

### rateInvalid

```solidity
mapping(address => mapping(bytes32 => bool)) public rateInvalid;
```

### repoRedemptionHaircut

```solidity
mapping(address => uint256) public repoRedemptionHaircut;
```

## Functions

### constructor

```solidity
constructor(address termController_, address oracleWallet_);
```

### getDiscountRate

Retrieves the discount rate for a given repo token

*This function fetches the auction results for the repo token's term repo ID and returns the clearing rate of the most recent auction*

```solidity
function getDiscountRate(address termController, address repoToken) public view virtual returns (uint256);
```

**Parameters**

| Name             | Type      | Description                        |
| ---------------- | --------- | ---------------------------------- |
| `termController` | `address` | The address of the term controller |
| `repoToken`      | `address` | The address of the repo token      |

**Returns**

| Name     | Type      | Description                                    |
| -------- | --------- | ---------------------------------------------- |
| `<none>` | `uint256` | The discount rate for the specified repo token |

### getDiscountRate

Retrieves the discount rate for a given repo token

*This function fetches the auction results for the repo token's term repo ID and returns the clearing rate of the most recent auction*

```solidity
function getDiscountRate(address repoToken) public view virtual returns (uint256);
```

**Parameters**

| Name        | Type      | Description                   |
| ----------- | --------- | ----------------------------- |
| `repoToken` | `address` | The address of the repo token |

**Returns**

| Name     | Type      | Description                                    |
| -------- | --------- | ---------------------------------------------- |
| `<none>` | `uint256` | The discount rate for the specified repo token |

### setAuctionRateValidator

Sets the invalidity of the result of a specific auction for a given repo token

*This function is used to mark auction results as invalid or not, typically in cases of suspected manipulation*

```solidity
function setAuctionRateValidator(address repoToken, bytes32 termAuctionId, bool isInvalid)
    external
    onlyRole(ORACLE_ROLE);
```

**Parameters**

| Name            | Type      | Description                                                 |
| --------------- | --------- | ----------------------------------------------------------- |
| `repoToken`     | `address` | The address of the repo token associated with the auction   |
| `termAuctionId` | `bytes32` | The unique identifier of the term auction to be invalidated |
| `isInvalid`     | `bool`    | The status of the rate invalidation                         |

### setTermController

Sets the term controller

```solidity
function setTermController(address termController) external onlyRole(ORACLE_ROLE);
```

**Parameters**

| Name             | Type      | Description                        |
| ---------------- | --------- | ---------------------------------- |
| `termController` | `address` | The address of the term controller |

### setRepoRedemptionHaircut

Set the repo redemption haircut

```solidity
function setRepoRedemptionHaircut(address repoToken, uint256 haircut) external onlyRole(ORACLE_ROLE);
```

**Parameters**

| Name        | Type      | Description                                |
| ----------- | --------- | ------------------------------------------ |
| `repoToken` | `address` | The address of the repo token              |
| `haircut`   | `uint256` | The repo redemption haircut in 18 decimals |

### \_identifyTermController

```solidity
function _identifyTermController(address termRepoToken) internal view returns (ITermController);
```

### \_getDiscountRate

```solidity
function _getDiscountRate(ITermController termController, address repoToken) internal view returns (uint256);
```

### \_validateAuctionExistence

```solidity
function _validateAuctionExistence(AuctionMetadata[] memory auctionMetadata, bytes32 termAuctionId)
    private
    pure
    returns (bool auctionExists);
```


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