ChainlinkCalculator

A helper contract for interactions with https://docs.chain.link

Functions​

singlePrice​

function singlePrice(
  contract AggregatorV3Interface oracle,
  uint256 inverseAndSpread,
  uint256 amount
) external returns (uint256)

Calculates price of token relative to oracle unit (ETH or USD)

Parameters:​

Name	Type	Description
oracle	contract AggregatorV3Interface	concatenated inverse flag and spread. Lowest 254 bits specify spread amount. Spread is scaled by 1e9, i.e. 101% = 1.01e9, 99% = 0.99e9. Highest bit is set when oracle price should be inverted, e.g. for DAI-ETH oracle, inverse=false means that we request DAI price in ETH and inverse=true means that we request ETH price in DAI
inverseAndSpread	uint256
amount	uint256

Return Values:​

Name	Type	Description
Amount	uint256	spread oracle price

doublePrice​

function doublePrice(
  contract AggregatorV3Interface oracle1,
  contract AggregatorV3Interface oracle2,
  uint256 spread,
  int256 decimalsScale,
  uint256 amount
) external returns (uint256)

Calculates price of token A relative to token B. Note that order is important

Parameters:​

Name	Type	Description
oracle1	contract AggregatorV3Interface
oracle2	contract AggregatorV3Interface
spread	uint256
decimalsScale	int256
amount	uint256

Return Values:​

Name	Type	Description
Result	uint256	Token A relative price times amount