Onchain Liquidity Mining

[0xripleys]

Instructions

New Instructions

AddLiquidityMiningRewards

arguments

• reserve: Pubkey
• RewardType: Deposit | Borrow
• token address: Pubkey
• token amount: u64
• duration_in_slots: u64

behavior

• transfer rewards to a token account owned by program

ClaimRewards

arguments

• reserve: Pubkey
• reward_id: u64

Modifying existing instructions

Deposit, Repay, Borrow, WIthdraw, Liquidate now all affect rewards calculations, so reward variables have to be "refreshed" at the start of each instruction now.

I think easiest way is to modify _refresh_reserve_interest to also refresh the rewards

State

RewardInfo

struct ReserveRewardInfo {
  id: u8,
  token_account: Pubkey,
  mint: Pubkey,
  accumulated_reward_rate: Decimal,
  last_updated_slot: u64,
  rewards_attributed: Decimal,
  total_rewards: u64
}

struct ObligationRewardInfo {
  id: u8,
  old_accumulator: Decimal,
  claimed_rewards: Decimal,
  unclaimed_rewards: Decimal
}

Other considerations:

• how to handle cases when the lm reward duration is finished? rewards can't accumulate forever. maybe best to have a cancelRewards function so the owner can withdraw
• should we have a way to permissionlessly crank LM rewards? in case reward refreshing causes compute issues. Compute issues are scary because they can break liquidations.