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feat: reduce gas for first vote by validators
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package ante | ||
|
|
||
| import ( | ||
| "cosmossdk.io/math" | ||
| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" | ||
| authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing" | ||
|
|
||
| "github.com/NibiruChain/nibiru/v2/x/oracle/types" | ||
| ) | ||
|
|
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| // VoteFeeDiscountDecorator checks if the Tx signer is a validator and | ||
| // has or hasn't voted in the current voting period. If it's their first time, | ||
| // we apply a discount on fees or gas. Otherwise, normal cost applies. | ||
| // | ||
| // In real code, you'll likely store more config, such as a reference to the | ||
| // staking keeper to fetch validator info, or track the current epoch. | ||
| type VoteFeeDiscountDecorator struct { | ||
| oracleKeeper OracleKeeperI | ||
| stakingKeeper StakingKeeperI | ||
| } | ||
|
|
||
| // NewVoteFeeDiscountDecorator is the constructor. | ||
| func NewVoteFeeDiscountDecorator( | ||
| oracleKeeper OracleKeeperI, | ||
| stakingKeeper StakingKeeperI, | ||
| ) VoteFeeDiscountDecorator { | ||
| return VoteFeeDiscountDecorator{ | ||
| oracleKeeper: oracleKeeper, | ||
| stakingKeeper: stakingKeeper, | ||
| } | ||
| } | ||
|
|
||
| // AnteHandle implements sdk.AnteDecorator. The discount logic is | ||
| // purely demonstrative; adapt to your own logic. | ||
| func (vfd VoteFeeDiscountDecorator) AnteHandle( | ||
| ctx sdk.Context, | ||
| tx sdk.Tx, | ||
| simulate bool, | ||
| next sdk.AnteHandler, | ||
| ) (newCtx sdk.Context, err error) { | ||
| // 1. We check if there's exactly one signer (typical for Oracle votes). | ||
| // If your chain supports multiple signers, adapt accordingly. | ||
| sigTx, ok := tx.(authsigning.SigVerifiableTx) | ||
| if !ok { | ||
| return ctx, sdkerrors.Wrapf(sdkerrors.ErrTxDecode, "invalid tx type %T", tx) | ||
| } | ||
|
|
||
| sigs, err := sigTx.GetSignaturesV2() | ||
| if err != nil { | ||
| return next(ctx, tx, simulate) | ||
| } | ||
| if len(sigs) != 1 { | ||
| // passthrough if not exactly one signer | ||
| return next(ctx, tx, simulate) | ||
| } | ||
|
|
||
| // ensure all messages are prevoting or voting messages | ||
| for _, msg := range tx.GetMsgs() { | ||
| if _, ok := msg.(*types.MsgAggregateExchangeRatePrevote); !ok { | ||
| if _, ok := msg.(*types.MsgAggregateExchangeRateVote); !ok { | ||
| return next(ctx, tx, simulate) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // 2. Check if the signer is a validator | ||
| valAddr := sdk.ValAddress(sigTx.GetSigners()[0]) | ||
| validator, found := vfd.stakingKeeper.GetValidator(ctx, valAddr) | ||
| if !found { | ||
| return next(ctx, tx, simulate) | ||
| } | ||
|
|
||
| if validator.Jailed { | ||
| return next(ctx, tx, simulate) | ||
| } | ||
|
|
||
| // needs to have at least 0.5% of the supply bonded | ||
| totalBonded := vfd.stakingKeeper.TotalBondedTokens(ctx) | ||
| currentlyBonded := validator.Tokens | ||
|
|
||
| if currentlyBonded.LT(totalBonded.Mul(math.NewInt(50)).Quo(math.NewInt(10000))) { | ||
| return next(ctx, tx, simulate) | ||
| } | ||
|
|
||
| // 3. If validator, we check whether they've posted a vote this period | ||
| hasVoted := vfd.oracleKeeper.HasVotedInCurrentPeriod(ctx, valAddr) | ||
| if !hasVoted { | ||
| // 4. If first time, let's say we reduce gas cost. | ||
| minGasPrices := ctx.MinGasPrices() | ||
| var discounted []sdk.DecCoin | ||
| for _, mgp := range minGasPrices { | ||
| discounted = append(discounted, sdk.NewDecCoinFromDec(mgp.Denom, mgp.Amount.QuoInt64(69_420))) | ||
| } | ||
| // We'll create a new context with the updated MinGasPrices | ||
| ctx = ctx.WithMinGasPrices(discounted) | ||
| } | ||
|
|
||
| // 5. Keep going in the AnteHandler chain | ||
| return next(ctx, tx, simulate) | ||
| } | ||
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