AaveOracle

Source Code

Contract to get asset prices, manage price sources and update the fallback oracle.

SparkLend utilizes a redundant oracle aggregator (Aggor) that leverages price feeds from Chronicle, Chainlink and Redstone for its lending markets.

The oracle uses Chainlink Aggregators as the first source of price. If the returned price by a Chainlink aggregator is <= 0, the call is forwarded to a fallback oracle. If the asset is the BASE_CURRENCY, it returns BASE_CURRENCY_UNIT directly.

State Variables

Name	Type	Description
`BASE_CURRENCY`	address	The base currency used for price quotes (if USD is used, base currency is 0x0)
`BASE_CURRENCY_UNIT`	uint256	The unit of the base currency

Constructor

constructor(
    IPoolAddressesProvider provider,
    address[] memory assets,
    address[] memory sources,
    address fallbackOracle,
    address baseCurrency,
    uint256 baseCurrencyUnit
)

Initializes the oracle with:

PoolAddressesProvider
Initial list of assets and their price sources
Fallback oracle address
Base currency and its unit

Methods

View

getAssetPrice

function getAssetPrice(address asset)

Returns the price of the supported asset in BASE_CURRENCY of SparkLend Market in wei.

If the asset is BASE_CURRENCY, returns BASE_CURRENCY_UNIT
Otherwise, tries to get price from price oracle (Aggor).

Return Value

Type	Description
uint256	Price in BASE_CURRENCY of the Spark market in wei.

getAssetsPrices

function getAssetsPrices(address[] calldata assets)

Returns the prices of the supported assets in BASE_CURRENCY of the Spark Market. All prices are in wei.

Call Params

Name	Type	Description
assets	address[]	The addresses of the assets for which price is being queried.

Return Value

Type	Description
uint256[]	Prices in BASE_CURRENCY of the Spark market in wei.

getSourceOfAsset

function getSourceOfAsset(address asset)

Returns the address of the price source for asset.

getFallbackOracle

function getFallbackOracle()

Returns the address of the fallback oracle.

Write

setAssetSources

function setAssetSources(address[] calldata assets, address[] calldata sources)

Sets the price source for given list of assets.

Call Params

Name	Type	Description
assets	address[]	The addresses of the assets for which source is being set.
sources	address[]	The address of the source of each asset. Length of assets and sources array should be same.

setFallbackOracle

function setFallbackOracle(address fallbackOracle)

Sets/updates the fallback oracle.

Call Params

Name	Type	Description
fallbackOracle	address	The address of the fallback oracle.