# PriceProvider

## Overview

#### License: MIT

```solidity
abstract contract PriceProvider
```

Abstract contract for a price provider that can be used by the PriceOracle contract.

## Functions info

### changeActive (0x258a4532)

```solidity
function changeActive(address token, bool active) public virtual
```

Changes the active status of a token.

Parameters:

| Name   | Type    | Description                                               |
| ------ | ------- | --------------------------------------------------------- |
| token  | address | The address of the token to change the active status for. |
| active | bool    | The new active status of the token.                       |

### updatePrices (0x0aa9adbc)

```solidity
function updatePrices(
    bytes32[] memory priceIds,
    bytes[] calldata updateData
) external payable virtual
```

Performs a price update if the price is no longer valid.

Parameters:

| Name       | Type       | Description                             |
| ---------- | ---------- | --------------------------------------- |
| priceIds   | bytes32\[] | The priceIds need to update.            |
| updateData | bytes\[]   | The updateData provided by PythNetwork. |

### isActive (0x9f8a13d7)

```solidity
function isActive(address token) public view virtual returns (bool)
```

Returns whether a token is active or not.

Parameters:

| Name  | Type    | Description                        |
| ----- | ------- | ---------------------------------- |
| token | address | The address of the token to check. |

Return values:

| Name | Type | Description                                              |
| ---- | ---- | -------------------------------------------------------- |
| \[0] | bool | A boolean indicating whether the token is active or not. |

### isListed (0xf794062e)

```solidity
function isListed(address token) public view virtual returns (bool)
```

Returns a boolean indicating whether the given token address is listed in the price provider.

Parameters:

| Name  | Type    | Description                        |
| ----- | ------- | ---------------------------------- |
| token | address | The address of the token to check. |

Return values:

| Name | Type | Description                                              |
| ---- | ---- | -------------------------------------------------------- |
| \[0] | bool | A boolean indicating whether the token is listed or not. |

### getPrice (0x41976e09)

```solidity
function getPrice(
    address token
) public view virtual returns (uint256 priceMantissa, uint8 priceDecimals)
```

Returns the price of the specified token.

Parameters:

| Name  | Type    | Description                                    |
| ----- | ------- | ---------------------------------------------- |
| token | address | The address of the token to get the price for. |

Return values:

| Name          | Type    | Description                                        |
| ------------- | ------- | -------------------------------------------------- |
| priceMantissa | uint256 | The price of the token, represented as a mantissa. |
| priceDecimals | uint8   | The number of decimal places in the token's price. |

### getPriceDecimals (0x1b30aafc)

```solidity
function getPriceDecimals() public view virtual returns (uint8 priceDecimals)
```

Returns the number of decimal places for the price returned by the price provider.

Return values:

| Name          | Type  | Description                                 |
| ------------- | ----- | ------------------------------------------- |
| priceDecimals | uint8 | The number of decimal places for the price. |

### getExpiredPriceFeeds (0xe1f67b13)

```solidity
function getExpiredPriceFeeds(
    address[] memory token,
    uint256 timeBeforeExpiration
) external view virtual returns (bytes32[] memory priceIds, uint256 updateFee)
```

Returns the expired price feeds for the given tokens and time before expiration.

Parameters:

| Name                 | Type       | Description                                                     |
| -------------------- | ---------- | --------------------------------------------------------------- |
| token                | address\[] | An array of token addresses to get the expired price feeds for. |
| timeBeforeExpiration | uint256    | The time in seconds before the price feed expires.              |

Return values:

| Name      | Type       | Description                                                  |
| --------- | ---------- | ------------------------------------------------------------ |
| priceIds  | bytes32\[] | An array of bytes32 representing the expired price feed IDs. |
| updateFee | uint256    | The fee required to update the expired price feeds.          |


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