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slash.go
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slash.go
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package keeper
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
types "github.com/cosmos/cosmos-sdk/x/staking/types"
)
// Slash a validator for an infraction committed at a known height
// Find the contributing stake at that height and burn the specified slashFactor
// of it, updating unbonding delegations & redelegations appropriately
//
// CONTRACT:
// slashFactor is non-negative
// CONTRACT:
// Infraction was committed equal to or less than an unbonding period in the past,
// so all unbonding delegations and redelegations from that height are stored
// CONTRACT:
// Slash will not slash unbonded validators (for the above reason)
// CONTRACT:
// Infraction was committed at the current height or at a past height,
// not at a height in the future
func (k Keeper) Slash(ctx sdk.Context, consAddr sdk.ConsAddress, infractionHeight int64, power int64, slashFactor sdk.Dec) {
logger := ctx.Logger().With("module", "x/staking")
if slashFactor.LT(sdk.ZeroDec()) {
panic(fmt.Errorf("attempted to slash with a negative slash factor: %v", slashFactor))
}
// Amount of slashing = slash slashFactor * power at time of infraction
amount := sdk.TokensFromTendermintPower(power)
slashAmountDec := amount.ToDec().Mul(slashFactor)
slashAmount := slashAmountDec.TruncateInt()
// ref https://github.com/cosmos/cosmos-sdk/issues/1348
validator, found := k.GetValidatorByConsAddr(ctx, consAddr)
if !found {
// If not found, the validator must have been overslashed and removed - so we don't need to do anything
// NOTE: Correctness dependent on invariant that unbonding delegations / redelegations must also have been completely
// slashed in this case - which we don't explicitly check, but should be true.
// Log the slash attempt for future reference (maybe we should tag it too)
logger.Error(fmt.Sprintf(
"WARNING: Ignored attempt to slash a nonexistent validator with address %s, we recommend you investigate immediately",
consAddr))
return
}
// should not be slashing an unbonded validator
if validator.Status == sdk.Unbonded {
panic(fmt.Sprintf("should not be slashing unbonded validator: %s", validator.GetOperator()))
}
operatorAddress := validator.GetOperator()
// call the before-modification hook
k.BeforeValidatorModified(ctx, operatorAddress)
// Track remaining slash amount for the validator
// This will decrease when we slash unbondings and
// redelegations, as that stake has since unbonded
remainingSlashAmount := slashAmount
switch {
case infractionHeight > ctx.BlockHeight():
// Can't slash infractions in the future
panic(fmt.Sprintf(
"impossible attempt to slash future infraction at height %d but we are at height %d",
infractionHeight, ctx.BlockHeight()))
case infractionHeight == ctx.BlockHeight():
// Special-case slash at current height for efficiency - we don't need to look through unbonding delegations or redelegations
logger.Info(fmt.Sprintf(
"slashing at current height %d, not scanning unbonding delegations & redelegations",
infractionHeight))
case infractionHeight < ctx.BlockHeight():
// Iterate through unbonding delegations from slashed validator
unbondingDelegations := k.GetUnbondingDelegationsFromValidator(ctx, operatorAddress)
for _, unbondingDelegation := range unbondingDelegations {
amountSlashed := k.slashUnbondingDelegation(ctx, unbondingDelegation, infractionHeight, slashFactor)
if amountSlashed.IsZero() {
continue
}
remainingSlashAmount = remainingSlashAmount.Sub(amountSlashed)
}
// Iterate through redelegations from slashed validator
redelegations := k.GetRedelegationsFromValidator(ctx, operatorAddress)
for _, redelegation := range redelegations {
amountSlashed := k.slashRedelegation(ctx, validator, redelegation, infractionHeight, slashFactor)
if amountSlashed.IsZero() {
continue
}
remainingSlashAmount = remainingSlashAmount.Sub(amountSlashed)
}
}
// cannot decrease balance below zero
tokensToBurn := sdk.MinInt(remainingSlashAmount, validator.Tokens)
tokensToBurn = sdk.MaxInt(tokensToBurn, sdk.ZeroInt()) // defensive.
// we need to calculate the *effective* slash fraction for distribution
if validator.Tokens.GT(sdk.ZeroInt()) {
effectiveFraction := tokensToBurn.ToDec().QuoRoundUp(validator.Tokens.ToDec())
// possible if power has changed
if effectiveFraction.GT(sdk.OneDec()) {
effectiveFraction = sdk.OneDec()
}
// call the before-slashed hook
k.BeforeValidatorSlashed(ctx, operatorAddress, effectiveFraction)
}
// Deduct from validator's bonded tokens and update the validator.
// The deducted tokens are returned to pool.NotBondedTokens.
// TODO: Move the token accounting outside of `RemoveValidatorTokens` so it is less confusing
validator = k.RemoveValidatorTokens(ctx, validator, tokensToBurn)
pool := k.GetPool(ctx)
// Burn the slashed tokens, which are now loose.
pool.NotBondedTokens = pool.NotBondedTokens.Sub(tokensToBurn)
k.SetPool(ctx, pool)
// Log that a slash occurred!
logger.Info(fmt.Sprintf(
"validator %s slashed by slash factor of %s; burned %v tokens",
validator.GetOperator(), slashFactor.String(), tokensToBurn))
// TODO Return event(s), blocked on https://github.com/tendermint/tendermint/pull/1803
return
}
// jail a validator
func (k Keeper) Jail(ctx sdk.Context, consAddr sdk.ConsAddress) {
validator := k.mustGetValidatorByConsAddr(ctx, consAddr)
k.jailValidator(ctx, validator)
logger := ctx.Logger().With("module", "x/staking")
logger.Info(fmt.Sprintf("validator %s jailed", consAddr))
// TODO Return event(s), blocked on https://github.com/tendermint/tendermint/pull/1803
return
}
// unjail a validator
func (k Keeper) Unjail(ctx sdk.Context, consAddr sdk.ConsAddress) {
validator := k.mustGetValidatorByConsAddr(ctx, consAddr)
k.unjailValidator(ctx, validator)
logger := ctx.Logger().With("module", "x/staking")
logger.Info(fmt.Sprintf("validator %s unjailed", consAddr))
// TODO Return event(s), blocked on https://github.com/tendermint/tendermint/pull/1803
return
}
// slash an unbonding delegation and update the pool
// return the amount that would have been slashed assuming
// the unbonding delegation had enough stake to slash
// (the amount actually slashed may be less if there's
// insufficient stake remaining)
func (k Keeper) slashUnbondingDelegation(ctx sdk.Context, unbondingDelegation types.UnbondingDelegation,
infractionHeight int64, slashFactor sdk.Dec) (totalSlashAmount sdk.Int) {
now := ctx.BlockHeader().Time
totalSlashAmount = sdk.ZeroInt()
// perform slashing on all entries within the unbonding delegation
for i, entry := range unbondingDelegation.Entries {
// If unbonding started before this height, stake didn't contribute to infraction
if entry.CreationHeight < infractionHeight {
continue
}
if entry.IsMature(now) {
// Unbonding delegation no longer eligible for slashing, skip it
continue
}
// Calculate slash amount proportional to stake contributing to infraction
slashAmountDec := slashFactor.MulInt(entry.InitialBalance)
slashAmount := slashAmountDec.TruncateInt()
totalSlashAmount = totalSlashAmount.Add(slashAmount)
// Don't slash more tokens than held
// Possible since the unbonding delegation may already
// have been slashed, and slash amounts are calculated
// according to stake held at time of infraction
unbondingSlashAmount := sdk.MinInt(slashAmount, entry.Balance)
// Update unbonding delegation if necessary
if unbondingSlashAmount.IsZero() {
continue
}
entry.Balance = entry.Balance.Sub(unbondingSlashAmount)
unbondingDelegation.Entries[i] = entry
k.SetUnbondingDelegation(ctx, unbondingDelegation)
pool := k.GetPool(ctx)
// Burn not-bonded tokens
// Ref https://github.com/cosmos/cosmos-sdk/pull/1278#discussion_r198657760
pool.NotBondedTokens = pool.NotBondedTokens.Sub(unbondingSlashAmount)
k.SetPool(ctx, pool)
}
return totalSlashAmount
}
// slash a redelegation and update the pool
// return the amount that would have been slashed assuming
// the unbonding delegation had enough stake to slash
// (the amount actually slashed may be less if there's
// insufficient stake remaining)
// nolint: unparam
func (k Keeper) slashRedelegation(ctx sdk.Context, validator types.Validator, redelegation types.Redelegation,
infractionHeight int64, slashFactor sdk.Dec) (totalSlashAmount sdk.Int) {
now := ctx.BlockHeader().Time
totalSlashAmount = sdk.ZeroInt()
// perform slashing on all entries within the redelegation
for _, entry := range redelegation.Entries {
// If redelegation started before this height, stake didn't contribute to infraction
if entry.CreationHeight < infractionHeight {
continue
}
if entry.IsMature(now) {
// Redelegation no longer eligible for slashing, skip it
continue
}
// Calculate slash amount proportional to stake contributing to infraction
slashAmountDec := slashFactor.MulInt(entry.InitialBalance)
slashAmount := slashAmountDec.TruncateInt()
totalSlashAmount = totalSlashAmount.Add(slashAmount)
// Unbond from target validator
sharesToUnbond := slashFactor.Mul(entry.SharesDst)
if sharesToUnbond.IsZero() {
continue
}
delegation, found := k.GetDelegation(ctx, redelegation.DelegatorAddress, redelegation.ValidatorDstAddress)
if !found {
// If deleted, delegation has zero shares, and we can't unbond any more
continue
}
if sharesToUnbond.GT(delegation.Shares) {
sharesToUnbond = delegation.Shares
}
tokensToBurn, err := k.unbond(ctx, redelegation.DelegatorAddress, redelegation.ValidatorDstAddress, sharesToUnbond)
if err != nil {
panic(fmt.Errorf("error unbonding delegator: %v", err))
}
// Burn not-bonded tokens
pool := k.GetPool(ctx)
pool.NotBondedTokens = pool.NotBondedTokens.Sub(tokensToBurn)
k.SetPool(ctx, pool)
}
return totalSlashAmount
}