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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/stake/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 delegation & redelegations appropriately
//
// CONTRACT:
// slashFactor is non-negative
// CONTRACT:
// Infraction 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 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/stake")
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
slashAmount := sdk.NewDec(power).Mul(slashFactor)
// ref https://github.com/cosmos/cosmos-sdk/issues/1348
// ref https://github.com/cosmos/cosmos-sdk/issues/1471
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 unbonded
if validator.Status == sdk.Unbonded {
panic(fmt.Sprintf("should not be slashing unbonded validator: %s", validator.GetOperator()))
}
operatorAddress := validator.GetOperator()
k.OnValidatorModified(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.MinDec(remainingSlashAmount, validator.Tokens)
tokensToBurn = sdk.MaxDec(tokensToBurn, sdk.ZeroDec()) // defensive.
// Deduct from validator's bonded tokens and update the validator.
// The deducted tokens are returned to pool.LooseTokens.
validator = k.RemoveValidatorTokens(ctx, validator, tokensToBurn)
pool := k.GetPool(ctx)
// Burn the slashed tokens, which are now loose.
pool.LooseTokens = pool.LooseTokens.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/stake")
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/stake")
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) (slashAmount sdk.Dec) {
now := ctx.BlockHeader().Time
// If unbonding started before this height, stake didn't contribute to infraction
if unbondingDelegation.CreationHeight < infractionHeight {
return sdk.ZeroDec()
}
if unbondingDelegation.MinTime.Before(now) {
// Unbonding delegation no longer eligible for slashing, skip it
// TODO Settle and delete it automatically?
return sdk.ZeroDec()
}
// Calculate slash amount proportional to stake contributing to infraction
slashAmount = slashFactor.MulInt(unbondingDelegation.InitialBalance.Amount)
// 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.RoundInt(), unbondingDelegation.Balance.Amount)
// Update unbonding delegation if necessary
if !unbondingSlashAmount.IsZero() {
unbondingDelegation.Balance.Amount = unbondingDelegation.Balance.Amount.Sub(unbondingSlashAmount)
k.SetUnbondingDelegation(ctx, unbondingDelegation)
pool := k.GetPool(ctx)
// Burn loose tokens
// Ref https://github.com/cosmos/cosmos-sdk/pull/1278#discussion_r198657760
pool.LooseTokens = pool.LooseTokens.Sub(sdk.NewDecFromInt(unbondingSlashAmount))
k.SetPool(ctx, pool)
}
return
}
// 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) (slashAmount sdk.Dec) {
now := ctx.BlockHeader().Time
// If redelegation started before this height, stake didn't contribute to infraction
if redelegation.CreationHeight < infractionHeight {
return sdk.ZeroDec()
}
if redelegation.MinTime.Before(now) {
// Redelegation no longer eligible for slashing, skip it
// TODO Delete it automatically?
return sdk.ZeroDec()
}
// Calculate slash amount proportional to stake contributing to infraction
slashAmount = slashFactor.MulInt(redelegation.InitialBalance.Amount)
// Don't slash more tokens than held
// Possible since the redelegation may already
// have been slashed, and slash amounts are calculated
// according to stake held at time of infraction
redelegationSlashAmount := sdk.MinInt(slashAmount.RoundInt(), redelegation.Balance.Amount)
// Update redelegation if necessary
if !redelegationSlashAmount.IsZero() {
redelegation.Balance.Amount = redelegation.Balance.Amount.Sub(redelegationSlashAmount)
k.SetRedelegation(ctx, redelegation)
}
// Unbond from target validator
sharesToUnbond := slashFactor.Mul(redelegation.SharesDst)
if !sharesToUnbond.IsZero() {
delegation, found := k.GetDelegation(ctx, redelegation.DelegatorAddr, redelegation.ValidatorDstAddr)
if !found {
// If deleted, delegation has zero shares, and we can't unbond any more
return slashAmount
}
if sharesToUnbond.GT(delegation.Shares) {
sharesToUnbond = delegation.Shares
}
tokensToBurn, err := k.unbond(ctx, redelegation.DelegatorAddr, redelegation.ValidatorDstAddr, sharesToUnbond)
if err != nil {
panic(fmt.Errorf("error unbonding delegator: %v", err))
}
// Burn loose tokens
pool := k.GetPool(ctx)
pool.LooseTokens = pool.LooseTokens.Sub(tokensToBurn)
k.SetPool(ctx, pool)
}
return slashAmount
}