v9.1 Update

Summary

• New features: GNS staking fees are all used to buy GNS, sends an adjustable % to treasury, burn, and GNS staking rewards and uses an adjustable price premium; new compound function in GNS staking

• Other changes: There is a 100 seconds cooldown to wait before one can unstake after staking GNS to prevent flashloans (vests must be 100 seconds long at least too now)

Full Changelog

core/GNSStaking.sol (update)

• New UNSTAKING_COOLDOWN_SECONDS constant (= 100 seconds)

• New stakerInfos mapping to store each user's lastDepositTs

• New notInCooldown modifier, used by unstakeGns, reverts if user deposited less than UNSTAKING_COOLDOWN_SECONDS ago

• _harvestToken, _harvestFromUnlock, _harvestTokenFromUnlock, harvestToken, harvestTokenFromUnlock, harvestTokenAll now all return the pending token rewards (needed for compound function)

• New compoundGnsRewards function: harvests pending regular rewards and vest rewards (accepts vests _ids as input) and stakes them in the same transaction

• stakeGns: now public (called by compoundGnsRewards) and stores current timestamp in stakerInfos mapping for caller

• unstakeGns: now uses notInCooldown modifier

• createUnlockSchedule: now checks vest duration >= UNSTAKING_COOLDOWN_SECONDS instead of accepting any non-zero value

core/abstract/GNSDiamondStorage.sol (update)

• Added otcStorage private state var for new GNSOtc facet

core/facets/GNSOtc.sol (new)

• New facet which handles the collateral -> GNS OTC buying process and transfer to treasury, burn, and GNS staking rewards (adjustable percentages)

• initializeOtc: infinite approval of GNS staking contract for GNS token and config initialization

• updateOtcConfig: update treasury address and percentages

• addOtcCollateralBalance: increases available collateral balance for OTC buying (used by GNSTradingCallbacks when distributing GNS staking fee)

• sellGnsForCollateral: executes OTC transaction; diamond receives GNS and sender receives collateral tokens, available collateral balance for OTC decreases accordingly

• getOtcConfig, getOtcBalance, getOtcRate getters

interfaces/IGNSMultiCollatDiamond.sol (update)

• Now inherits IOtcUtils

interfaces/IGNSStaking.sol (update)

• New StakerInfo struct (lastDepositTs and placeholder)

interfaces/IGeneralErrors.sol (update)

• New InsufficientBalance() error

interfaces/libraries/IOtcUtils.sol (new)

• Interface for new GNSOtc facet: contains all types, functions, events, and custom errors

interfaces/types/IOtc.sol (new)

• Interface for new GNSOtc facet: contains all types

• OtcStorage struct: collateralBalances mapping, otcConfig struct

• OtcConfig struct: treasury address, percentages (treasury, GNS staking, burn), price premium

interfaces/types/IPriceAggregator.sol (update)

• Fixed __gap array length, reduced from 41 to 39

interfaces/types/ITypes.sol (update)

• Now inherits new facet types IOtc

libraries/OtcUtils.sol (new)

• Internal library for new GNSOtc facet

libraries/StorageUtils.sol (update)

• Added GLOBAL_OTC_SLOT constant for new GNSOtc facet

libraries/TradingCommonUtils.sol (update)

• convertCollateralToGns, transferCollateralTo, and _getMultiCollatDiamond are now internal: allows not linking TradingCommonUtils to GNSOtc as internal functions are imported directly into the bytecode, should only make functions external when it becomes an issue for size

• New transferGnsTo and transferGnsFrom helpers to handle simple GNS transfers between users and the diamond

• distributeGnsStakingFeeCollateral now calls _getMultiCollatDiamond().addOtcCollateralBalance instead of gnsStaking.distributeReward