This document provides an in depth look into how the contracts will call each other during each user action.
When a user calls the mint function on the MToken, it will call the mintAllowed function on the Comptroller. If the mint is allowed, then updateMarketSupplyIndexAndDisburseSupplierRewards on the MultiRewardDistributor contract is called, which then updates the supply reward index on the the MultiRewardDistributor. Then, the user individual rewards is updated by calling the MToken balanceOf function, figuring out how much tokens a user had for what duration, and then calculating the amount of rewards they have accrued.
Summarizing the interactions that occur when a user calls mint: MToken -> Comptroller -> MultiRewardDistributor -> MToken
When a user calls the borrow function on the MToken, it will call the borrowAllowed function on the Comptroller. If the borrow is allowed, then updateMarketBorrowIndexAndDisburseBorrowerRewards on the MultiRewardDistributor contract is called, which then updates the supply reward index on the MultiRewardDistributor. Then, the user individual rewards is updated by calling the MToken borrowBalanceStored function, figuring out how much tokens a user had borrowed for what duration, and then calculating the amount of rewards they have accrued for initiating that borrow.
Summarizing the interactions that occur when a user calls borrow: MToken -> Comptroller -> MultiRewardDistributor -> MToken