Merge pull request cosmos#3166 from cosmos/cwgoes/gos-patch-1

Merge GoS point release back to develop

CHANGELOG.md

@@ -1,8 +1,19 @@
 # Changelog
 
+## 0.29.0
+
+BREAKING CHANGES
+
+* Gaia
+  * [\#3148](https://github.com/cosmos/cosmos-sdk/issues/3148) Fix `gaiad export` by adding a boolean to `NewGaiaApp` determining whether or not to load the latest version
+
+* SDK
+  * [\#3163](https://github.com/cosmos/cosmos-sdk/issues/3163) Withdraw commission on self bond removal
+
+
 ## 0.28.1
 
-BREAKNG CHANGES
+BREAKING CHANGES
 
 * Gaia REST API (`gaiacli advanced rest-server`)
   * [lcd] [\#3045](https://github.com/cosmos/cosmos-sdk/pull/3045) Fix quoted json return on GET /keys (keys list)
@@ -25,11 +36,11 @@ FEATURES
 IMPROVEMENTS
 
 * Gaia REST API (`gaiacli advanced rest-server`)
-  * \#2879, \#2880 Update deposit and vote endpoints to perform a direct txs query
+  * [\#2879](https://github.com/cosmos/cosmos-sdk/issues/2879), [\#2880](https://github.com/cosmos/cosmos-sdk/issues/2880) Update deposit and vote endpoints to perform a direct txs query
     when a given proposal is inactive and thus having votes and deposits removed
     from state.
 * Gaia CLI  (`gaiacli`)
-  * \#2879, \#2880 Update deposit and vote CLI commands to perform a direct txs query
+  * [\#2879](https://github.com/cosmos/cosmos-sdk/issues/2879), [\#2880](https://github.com/cosmos/cosmos-sdk/issues/2880) Update deposit and vote CLI commands to perform a direct txs query
     when a given proposal is inactive and thus having votes and deposits removed
     from state.
 * Gaia

x/distribution/keeper/hooks.go

@@ -87,6 +87,17 @@ func (k Keeper) onDelegationSharesModified(ctx sdk.Context, delAddr sdk.AccAddre
 // Withdrawal all validator distribution rewards and cleanup the distribution record
 func (k Keeper) onDelegationRemoved(ctx sdk.Context, delAddr sdk.AccAddress,
 	valAddr sdk.ValAddress) {
+	// Withdraw validator commission when validator self-bond is removed.
+	// Because we maintain the invariant that all delegations must be removed
+	// before a validator is deleted, this ensures that commission will be withdrawn
+	// before the validator is deleted (and the corresponding ValidatorDistInfo removed).
+	// If we change other parts of the code such that a self-delegation might remain after
+	// a validator is deleted, this logic will no longer be safe.
+	// TODO: Consider instead implementing this in a "BeforeValidatorRemoved" hook.
+	if valAddr.Equals(sdk.ValAddress(delAddr)) {
+		feePool, commission := k.withdrawValidatorCommission(ctx, valAddr)
+		k.WithdrawToDelegator(ctx, feePool, delAddr, commission)
+	}
 
 	k.RemoveDelegationDistInfo(ctx, delAddr, valAddr)
 }

x/distribution/keeper/validator.go

@@ -42,6 +42,9 @@ func (k Keeper) RemoveValidatorDistInfo(ctx sdk.Context, valAddr sdk.ValAddress)
 	if vdi.DelAccum.Accum.IsPositive() {
 		panic("Should not delete validator with unwithdrawn delegator accum")
 	}
+	if !vdi.ValCommission.IsZero() {
+		panic("Should not delete validator with unwithdrawn validator commission")
+	}
 
 	store := ctx.KVStore(k.storeKey)
 	store.Delete(GetValidatorDistInfoKey(valAddr))
@@ -119,6 +122,15 @@ func (k Keeper) takeValidatorFeePoolRewards(ctx sdk.Context, operatorAddr sdk.Va
 	return nil
 }
 
+func (k Keeper) withdrawValidatorCommission(ctx sdk.Context, operatorAddr sdk.ValAddress) (types.FeePool, types.DecCoins) {
+	valInfo := k.GetValidatorDistInfo(ctx, operatorAddr)
+	wc := k.GetWithdrawContext(ctx, operatorAddr)
+	valInfo, feePool, commission := valInfo.WithdrawCommission(wc)
+	k.SetValidatorDistInfo(ctx, valInfo)
+
+	return feePool, commission
+}
+
 // withdrawal all the validator rewards including the commission
 func (k Keeper) WithdrawValidatorRewardsAll(ctx sdk.Context, operatorAddr sdk.ValAddress) sdk.Error {
 	if !k.HasValidatorDistInfo(ctx, operatorAddr) {
@@ -130,11 +142,8 @@ func (k Keeper) WithdrawValidatorRewardsAll(ctx sdk.Context, operatorAddr sdk.Va
 	withdraw := k.withdrawDelegationRewardsAll(ctx, accAddr)
 
 	// withdrawal validator commission rewards
-	valInfo := k.GetValidatorDistInfo(ctx, operatorAddr)
-	wc := k.GetWithdrawContext(ctx, operatorAddr)
-	valInfo, feePool, commission := valInfo.WithdrawCommission(wc)
+	feePool, commission := k.withdrawValidatorCommission(ctx, operatorAddr)
 	withdraw = withdraw.Plus(commission)
-	k.SetValidatorDistInfo(ctx, valInfo)
 
 	k.WithdrawToDelegator(ctx, feePool, accAddr, withdraw)
 	return nil