Delphi 🔮🌜

Delphi is a set of contracts that allows anyone to permissionlessly create oracles which perform an arbitrary mathematical operation on data from ChainLink Aggregators.

Utilizes a modified version of Band Protocol's equation evaluation library that allows for multiple variables to be used.

Specification

DelphiFactoryV1
- createOracle(string _name, address[] _aggregators, uint256[] _expressions)
  - Creates an oracle that uses the given aggregators and evaluates the equation defined in _expressions.
  - _expressions is an array of Opcodes and their children. (See src/math/Equation.sol for more info)
- setAllowAggregator(address _aggregator, bool _allow)
  - ADMIN FUNCTION: Allows/disallows an aggregator for usage in creation of future oracles.
- setEndorsed(address _oracle, bool _endorsed)
  - ADMIN FUNCTION: Endorses/Unendorses an oracle that was created by the factory.
- transferOwnership(address _newOwner)
  - ADMIN FUNCTION: Transfers the ownership of the factory to _newOwner
DelphiOracleV1
- init(address _factory, address[] _aggregators, uint256[] _expressions)
  - Called by the DelphiFactoryV1 contract upon creation of the oracle. Can only be called once.
- getLatestValue() view returns (int256)
  - Returns the latest value of the oracle by executing the equation with the most recent data from ChainLink Aggregators.
- latestRoundData() & latestAnswer()
  - Provided for use as an AggregatorV2V3Interface
- getAggregators() view returns (AggregatorV2V3Interface[] memory)
  - Get the addresses of the aggregators that the oracle's equation utilizes.
- getNodes() view returns (Equation.Node[] memory)
  - Get the oracle's equation nodes.