# PriceProvidersRepository

> PriceProvidersRepository

A repository of price providers. It manages price providers as well as maps assets to their price provider. It acts as a entry point for Silo for token prices.

## Methods

### acceptOwnership

```solidity
function acceptOwnership() external nonpayable
```

*Transfers ownership of the contract to a pending owner Can only be called by the pending owner.*

### addPriceProvider

```solidity
function addPriceProvider(contract IPriceProvider _provider) external nonpayable
```

Register new price provider

#### Parameters

| Name       | Type                    | Description |
| ---------- | ----------------------- | ----------- |
| \_provider | contract IPriceProvider | undefined   |

### changeManager

```solidity
function changeManager(address _manager) external nonpayable
```

Change manager address

*Callable by manager or external owner role*

#### Parameters

| Name      | Type    | Description         |
| --------- | ------- | ------------------- |
| \_manager | address | new manager address |

### getPrice

```solidity
function getPrice(address _asset) external view returns (uint256)
```

Returns "Time-Weighted Average Price" for an asset

#### Parameters

| Name    | Type    | Description                                 |
| ------- | ------- | ------------------------------------------- |
| \_asset | address | address of an asset for which to read price |

#### Returns

| Name | Type    | Description                            |
| ---- | ------- | -------------------------------------- |
| \_0  | uint256 | TWAP price of a token with 18 decimals |

### isPriceProvider

```solidity
function isPriceProvider(contract IPriceProvider _provider) external view returns (bool)
```

Returns true if address is a registered price provider

#### Parameters

| Name       | Type                    | Description                             |
| ---------- | ----------------------- | --------------------------------------- |
| \_provider | contract IPriceProvider | address of price provider to be removed |

#### Returns

| Name | Type | Description                                                     |
| ---- | ---- | --------------------------------------------------------------- |
| \_0  | bool | true if address is a registered price provider, otherwise false |

### manager

```solidity
function manager() external view returns (address)
```

Gets manager role address

#### Returns

| Name | Type    | Description          |
| ---- | ------- | -------------------- |
| \_0  | address | manager role address |

### owner

```solidity
function owner() external view returns (address)
```

*Returns the address of the current owner.*

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

### pendingOwner

```solidity
function pendingOwner() external view returns (address)
```

*Returns the address of the pending owner.*

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

### priceProviders

```solidity
function priceProviders(address) external view returns (contract IPriceProvider)
```

Maps asset address to its price provider

*Each asset must have a price provider contract assigned, otherwise it's not supported*

#### Parameters

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

#### Returns

| Name | Type                    | Description |
| ---- | ----------------------- | ----------- |
| \_0  | contract IPriceProvider | undefined   |

### priceProvidersRepositoryPing

```solidity
function priceProvidersRepositoryPing() external pure returns (bool)
```

Sanity check funciton

#### Returns

| Name | Type | Description         |
| ---- | ---- | ------------------- |
| \_0  | bool | returns always TRUE |

### providerList

```solidity
function providerList() external view returns (address[])
```

Gets an array of price providers

#### Returns

| Name | Type       | Description              |
| ---- | ---------- | ------------------------ |
| \_0  | address\[] | array of price providers |

### providersCount

```solidity
function providersCount() external view returns (uint256)
```

Gets number of pice providers registerd

#### Returns

| Name | Type    | Description                        |
| ---- | ------- | ---------------------------------- |
| \_0  | uint256 | number of pice providers registerd |

### providersReadyForAsset

```solidity
function providersReadyForAsset(address _asset) external view returns (bool)
```

Check if prices are available for an asset

#### Parameters

| Name    | Type    | Description            |
| ------- | ------- | ---------------------- |
| \_asset | address | asset address to check |

#### Returns

| Name | Type | Description                                          |
| ---- | ---- | ---------------------------------------------------- |
| \_0  | bool | returns TRUE if price feed is ready, otherwise false |

### quoteToken

```solidity
function quoteToken() external view returns (address)
```

Token in which prices are quoted. It's most likely WETH, however it could vary from deployment to deployment. For example 1 SILO costs X amount of quoteToken.

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

### removePriceProvider

```solidity
function removePriceProvider(contract IPriceProvider _provider) external nonpayable
```

Unregister price provider

#### Parameters

| Name       | Type                    | Description |
| ---------- | ----------------------- | ----------- |
| \_provider | contract IPriceProvider | undefined   |

### renounceOwnership

```solidity
function renounceOwnership() external nonpayable
```

*Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner.*

### setPriceProviderForAsset

```solidity
function setPriceProviderForAsset(address _asset, contract IPriceProvider _provider) external nonpayable
```

Sets price provider for asset

*Request for asset price is forwarded to the price provider assigned to that asset*

#### Parameters

| Name       | Type                    | Description                                               |
| ---------- | ----------------------- | --------------------------------------------------------- |
| \_asset    | address                 | address of an asset for which price provider will be used |
| \_provider | contract IPriceProvider | undefined                                                 |

### siloRepository

```solidity
function siloRepository() external view returns (address)
```

SiloRepository contract address

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

### transferOwnership

```solidity
function transferOwnership(address newOwner) external nonpayable
```

*Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner.*

#### Parameters

| Name     | Type    | Description |
| -------- | ------- | ----------- |
| newOwner | address | undefined   |

### transferPendingOwnership

```solidity
function transferPendingOwnership(address newPendingOwner) external nonpayable
```

*Transfers pending ownership of the contract to a new account (`newPendingOwner`). Can only be called by the current owner.*

#### Parameters

| Name            | Type    | Description |
| --------------- | ------- | ----------- |
| newPendingOwner | address | undefined   |

## Events

### ManagerChanged

```solidity
event ManagerChanged(address manager)
```

Emitted when manager is changed

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| manager | address | undefined   |

### NewPriceProvider

```solidity
event NewPriceProvider(contract IPriceProvider newPriceProvider)
```

Emitted when price provider is added

#### Parameters

| Name             | Type                    | Description |
| ---------------- | ----------------------- | ----------- |
| newPriceProvider | contract IPriceProvider | undefined   |

### OwnershipPending

```solidity
event OwnershipPending(address indexed previousOwner, address indexed newOwner)
```

Emitted when ownership transfer is proposed, aka pending owner is set

#### Parameters

| Name                    | Type    | Description |
| ----------------------- | ------- | ----------- |
| previousOwner `indexed` | address | undefined   |
| newOwner `indexed`      | address | undefined   |

### OwnershipTransferred

```solidity
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner)
```

Emitted when ownership is transferred on `transferOwnership` and `acceptOwnership`

#### Parameters

| Name                    | Type    | Description |
| ----------------------- | ------- | ----------- |
| previousOwner `indexed` | address | undefined   |
| newOwner `indexed`      | address | undefined   |

### PriceProviderForAsset

```solidity
event PriceProviderForAsset(address indexed asset, contract IPriceProvider priceProvider)
```

Emitted when asset is assigned to price provider

#### Parameters

| Name            | Type                    | Description |
| --------------- | ----------------------- | ----------- |
| asset `indexed` | address                 | undefined   |
| priceProvider   | contract IPriceProvider | undefined   |

### PriceProviderRemoved

```solidity
event PriceProviderRemoved(contract IPriceProvider priceProvider)
```

Emitted when price provider is removed

#### Parameters

| Name          | Type                    | Description |
| ------------- | ----------------------- | ----------- |
| priceProvider | contract IPriceProvider | undefined   |


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