# OracleLibrary

Provides functions to integrate with V2 pool oracle

### Functions[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#functions) <a href="#functions" id="functions"></a>

#### consult[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#consult) <a href="#consult" id="consult"></a>

```solidity
  function consult(
    address pool,
    uint32 period
  ) internal view returns (int24 arithmeticMeanTick, uint128 harmonicMeanLiquidity)
```

Calculates time-weighted means of tick and liquidity for a given DragonswapV2 pool

**Parameters:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#parameters)

| Name     | Type    | Description                                                              |
| -------- | ------- | ------------------------------------------------------------------------ |
| `pool`   | address | Address of DragonswapV2 pool that we want to observe                     |
| `period` | uint32  | Number of seconds in the past to start calculating time-weighted average |

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#return-values)

| Name                    | Type    | Description                                                                        |
| ----------------------- | ------- | ---------------------------------------------------------------------------------- |
| `arithmeticMeanTick`    | int24   | The arithmetic mean tick from (block.timestamp - secondsAgo) to block.timestamp    |
| `harmonicMeanLiquidity` | uint128 | The harmonic mean liquidity from (block.timestamp - secondsAgo) to block.timestamp |

#### getQuoteAtTick[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#getquoteattick) <a href="#getquoteattick" id="getquoteattick"></a>

```solidity
  function getQuoteAtTick(
    int24 tick,
    uint128 baseAmount,
    address baseToken,
    address quoteToken
  ) internal pure returns (uint256 quoteAmount)
```

Given a tick and a token amount, calculates the amount of token received in exchange

**Parameters:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#parameters-1)

| Name         | Type    | Description                                                             |
| ------------ | ------- | ----------------------------------------------------------------------- |
| `tick`       | int24   | Tick value used to calculate the quote                                  |
| `baseAmount` | uint128 | Amount of token to be converted                                         |
| `baseToken`  | address | Address of an ERC20 token contract used as the baseAmount denomination  |
| `quoteToken` | address | Address of an ERC20 token contract used as the quoteAmount denomination |

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/OracleLibrary#return-values-1)

| Name          | Type    | Description                                               |
| ------------- | ------- | --------------------------------------------------------- |
| `quoteAmount` | uint256 | Amount of quoteToken received for baseAmount of baseToken |