-
Notifications
You must be signed in to change notification settings - Fork 0
/
slash.go
318 lines (269 loc) · 10.8 KB
/
slash.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
package keeper
import (
"fmt"
"cosmossdk.io/math"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkstaking "github.com/cosmos/cosmos-sdk/x/staking/types"
types "github.com/incubus-network/fanfury-sdk/v2/x/lsnative/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) math.Int {
logger := k.Logger(ctx)
if slashFactor.IsNegative() {
panic(fmt.Errorf("attempted to slash with a negative slash factor: %v", slashFactor))
}
// Amount of slashing = slash slashFactor * power at time of infraction
amount := k.TokensFromConsensusPower(ctx, power)
slashAmountDec := sdk.NewDecFromInt(amount).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(
"WARNING: ignored attempt to slash a nonexistent validator; we recommend you investigate immediately",
"validator", consAddr.String(),
)
return sdk.NewInt(0)
}
// should not be slashing an unbonded validator
if validator.IsUnbonded() {
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(
"slashing at current height; not scanning unbonding delegations & redelegations",
"height", 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 source validator
redelegations := k.GetRedelegationsFromSrcValidator(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.IsPositive() {
effectiveFraction := sdk.NewDecFromInt(tokensToBurn).QuoRoundUp(sdk.NewDecFromInt(validator.Tokens))
// 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.
// Burn the slashed tokens from the pool account and decrease the total supply.
validator = k.RemoveValidatorTokens(ctx, validator, tokensToBurn)
// Proportionally deduct any liquid tokens from the global total
var validatorLiquidRatio sdk.Dec
if validator.TotalLiquidShares.IsNil() {
validatorLiquidRatio = sdk.ZeroDec()
} else {
validatorLiquidRatio = validator.TotalLiquidShares.Quo(validator.DelegatorShares)
}
slashedLiquidTokens := validatorLiquidRatio.Mul(sdk.NewDecFromInt(slashAmount)).TruncateInt()
k.DecreaseTotalLiquidStakedTokens(ctx, slashedLiquidTokens)
switch validator.GetStatus() {
case sdkstaking.Bonded:
if err := k.burnBondedTokens(ctx, tokensToBurn); err != nil {
panic(err)
}
case sdkstaking.Unbonding, sdkstaking.Unbonded:
if err := k.burnNotBondedTokens(ctx, tokensToBurn); err != nil {
panic(err)
}
default:
panic("invalid validator status")
}
logger.Info(
"validator slashed by slash factor",
"validator", validator.GetOperator().String(),
"slash_factor", slashFactor.String(),
"burned", tokensToBurn,
)
return tokensToBurn
}
// jail a validator
func (k Keeper) Jail(ctx sdk.Context, consAddr sdk.ConsAddress) {
validator := k.mustGetValidatorByConsAddr(ctx, consAddr)
k.jailValidator(ctx, validator)
logger := k.Logger(ctx)
logger.Info("validator jailed", "validator", consAddr)
}
// unjail a validator
func (k Keeper) Unjail(ctx sdk.Context, consAddr sdk.ConsAddress) {
validator := k.mustGetValidatorByConsAddr(ctx, consAddr)
k.unjailValidator(ctx, validator)
logger := k.Logger(ctx)
logger.Info("validator un-jailed", "validator", consAddr)
}
// 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 math.Int) {
now := ctx.BlockHeader().Time
totalSlashAmount = sdk.ZeroInt()
burnedAmount := 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
}
burnedAmount = burnedAmount.Add(unbondingSlashAmount)
entry.Balance = entry.Balance.Sub(unbondingSlashAmount)
unbondingDelegation.Entries[i] = entry
k.SetUnbondingDelegation(ctx, unbondingDelegation)
}
if err := k.burnNotBondedTokens(ctx, burnedAmount); err != nil {
panic(err)
}
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)
// NOTE this is only slashing for prior infractions from the source validator
func (k Keeper) SlashRedelegation(ctx sdk.Context, srcValidator types.Validator, redelegation types.Redelegation,
infractionHeight int64, slashFactor sdk.Dec,
) (totalSlashAmount math.Int) {
now := ctx.BlockHeader().Time
totalSlashAmount = sdk.ZeroInt()
bondedBurnedAmount, notBondedBurnedAmount := sdk.ZeroInt(), 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
}
valDstAddr, err := sdk.ValAddressFromBech32(redelegation.ValidatorDstAddress)
if err != nil {
panic(err)
}
delegatorAddress := sdk.MustAccAddressFromBech32(redelegation.DelegatorAddress)
delegation, found := k.GetLiquidDelegation(ctx, delegatorAddress, valDstAddr)
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, delegatorAddress, valDstAddr, sharesToUnbond)
if err != nil {
panic(fmt.Errorf("error unbonding delegator: %v", err))
}
dstValidator, found := k.GetLiquidValidator(ctx, valDstAddr)
if !found {
panic("destination validator not found")
}
// tokens of a redelegation currently live in the destination validator
// therefor we must burn tokens from the destination-validator's bonding status
switch {
case dstValidator.IsBonded():
bondedBurnedAmount = bondedBurnedAmount.Add(tokensToBurn)
case dstValidator.IsUnbonded() || dstValidator.IsUnbonding():
notBondedBurnedAmount = notBondedBurnedAmount.Add(tokensToBurn)
default:
panic("unknown validator status")
}
}
if err := k.burnBondedTokens(ctx, bondedBurnedAmount); err != nil {
panic(err)
}
if err := k.burnNotBondedTokens(ctx, notBondedBurnedAmount); err != nil {
panic(err)
}
return totalSlashAmount
}