Soloseng/celo-minting-schedule

Description

Created a contract MintGoldSchedule.sol that calculates the amount of CELO to mint and distribute to the community fund and carbon offsetting fund address. This contract can be deployed on L1, but will only be activated on L2 by calling MintGoldSchedule.setDependencies().

This schedule is based on the existing schedule previously defined by EpochRewards contract. In this new schedule, only the percentage of CELO allocated to community rewards and carbon offsetting fund is minted.

As with the L1 minting schedule, the L2 minting schedule in only defined for the first 15 years after L1 genesis block. Future modification to the MintGoldSchedule contract will be required to define a schedule beyond the first 15 years. Additionally, setting the distribution fraction for any fund is prohibited once the first 15 years have elapsed.

GoldToken.sol was updated to only allow minting by the owner or the MintGoldSchedule contract.

Other changes

IGoldToken.sol interface was added to allow MintGoldSchedule to call GoldToken.mint() .
A new MockGovernance contract, using pragma 0.8, was added to allow testing of the MintGoldSchedule. Using deployCodeTo("Governance.sol", abi.encode(false), governanceAddress); does not work, as the Governance contract bytecode has a placeholder for the libraries that it is using and Foundry does not provide a way to link the library during the compilation step of the tests.

Tested

Added unit tests for this new contract.
Updated goldToken test to addd minting tests.

Related issues

Fixes https://github.com/celo-org/celo-blockchain-planning/issues/200

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 3 0 15 42 62
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

celo-org / celo-monorepo