fix: Global min Self Delegation

docs/core/proto-docs.md

@@ -6505,6 +6505,7 @@ Params defines the parameters for the staking module.
 | `historical_entries` | [uint32](#uint32) |  | historical_entries is the number of historical entries to persist. |
 | `bond_denom` | [string](#string) |  | bond_denom defines the bondable coin denomination. |
 | `min_commission_rate` | [string](#string) |  | min_commission_rate is the chain-wide minimum commission rate that a validator can charge their delegators |
+| `min_self_delegation` | [string](#string) |  | min_commission_rate is the chain-wide minimum commission rate that a validator can charge their delegators |
 
 
 

go.sum

@@ -615,12 +615,8 @@ github.com/openzipkin/zipkin-go v0.2.1/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnh
 github.com/openzipkin/zipkin-go v0.2.2/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnhQw8ySjnjRyN4=
 github.com/ory/dockertest v3.3.5+incompatible h1:iLLK6SQwIhcbrG783Dghaaa3WPzGc+4Emza6EbVUUGA=
 github.com/ory/dockertest v3.3.5+incompatible/go.mod h1:1vX4m9wsvi00u5bseYwXaSnhNrne+V0E6LAcBILJdPs=
-github.com/osmosis-labs/iavl v0.17.3-osmo-v3 h1:q2Qv3+DK52w5b68I96VApHI05jBu7HeQK/YDttKh/jY=
-github.com/osmosis-labs/iavl v0.17.3-osmo-v3/go.mod h1:lJEOIlsd3sVO0JDyXWIXa9/Ur5FBscP26zJx0KxHjto=
 github.com/osmosis-labs/iavl v0.17.3-osmo-v4 h1:U1HA2WEMAYVPjeJlfClH10ajv6O0C1C1jk/SQxDPwyM=
 github.com/osmosis-labs/iavl v0.17.3-osmo-v4/go.mod h1:lJEOIlsd3sVO0JDyXWIXa9/Ur5FBscP26zJx0KxHjto=
-github.com/osmosis-labs/iavl v0.17.3-osmo-v4.rc2 h1:Sq5909z6y/tfN4lrOrqgSwZWjqQzmyeTtVfIlRK9tz0=
-github.com/osmosis-labs/iavl v0.17.3-osmo-v4.rc2/go.mod h1:lJEOIlsd3sVO0JDyXWIXa9/Ur5FBscP26zJx0KxHjto=
 github.com/osmosis-labs/tm-db v0.6.5-0.20210911033928-ba9154613417 h1:otchJDd2SjFWfs7Tse3ULblGcVWqMJ50BE02XCaqXOo=
 github.com/osmosis-labs/tm-db v0.6.5-0.20210911033928-ba9154613417/go.mod h1:dptYhIpJ2M5kUuenLr+Yyf3zQOv1SgBZcl8/BmWlMBw=
 github.com/otiai10/copy v1.6.0 h1:IinKAryFFuPONZ7cm6T6E2QX/vcJwSnlaA5lfoaXIiQ=

proto/cosmos/staking/v1beta1/staking.proto

@@ -288,6 +288,12 @@ message Params {
     (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
     (gogoproto.nullable)   = false
   ];
+  // min_self_delegation is the chain-wide minimum amount that a validator has to self delegate
+  string min_self_delegation = 7 [
+    (gogoproto.moretags)   = "yaml:\"min_self_delegation\"",
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable)   = false
+  ];
 }
 
 // DelegationResponse is equivalent to Delegation except that it contains a

x/staking/keeper/params.go

@@ -53,6 +53,12 @@ func (k Keeper) MinCommissionRate(ctx sdk.Context) (res sdk.Dec) {
 	return
 }
 
+// MinSelfDelegation - Minimum validator self-delegation
+func (k Keeper) MinSelfDelegation(ctx sdk.Context) (res sdk.Int) {
+	k.paramstore.Get(ctx, types.KeyMinSelfDelegation, &res)
+	return
+}
+
 // Get all parameters as types.Params
 func (k Keeper) GetParams(ctx sdk.Context) types.Params {
 	return types.NewParams(
@@ -62,6 +68,7 @@ func (k Keeper) GetParams(ctx sdk.Context) types.Params {
 		k.HistoricalEntries(ctx),
 		k.BondDenom(ctx),
 		k.MinCommissionRate(ctx),
+		k.MinSelfDelegation(ctx),
 	)
 }
 

x/staking/legacy/v040/migrate.go

@@ -130,6 +130,7 @@ func Migrate(stakingState v038staking.GenesisState) *GenesisState {
 			HistoricalEntries: uint32(stakingState.Params.HistoricalEntries),
 			BondDenom:         stakingState.Params.BondDenom,
 			MinCommissionRate: v040staking.DefaultMinCommissionRate,
+			// MinSelfDelegation: v040staking.DefaultMinSelfDelegation,
 		},
 		LastTotalPower:       stakingState.LastTotalPower,
 		LastValidatorPowers:  newLastValidatorPowers,

x/staking/simulation/genesis.go

@@ -45,6 +45,7 @@ func RandomizedGenState(simState *module.SimulationState) {
 		maxVals     uint32
 		histEntries uint32
 		minComRate  sdk.Dec
+		minSelfDel  sdk.Int
 	)
 
 	simState.AppParams.GetOrGenerate(
@@ -70,7 +71,7 @@ func RandomizedGenState(simState *module.SimulationState) {
 	// NOTE: the slashing module need to be defined after the staking module on the
 	// NewSimulationManager constructor for this to work
 	simState.UnbondTime = unbondTime
-	params := types.NewParams(simState.UnbondTime, maxVals, 7, histEntries, sdk.DefaultBondDenom, minComRate)
+	params := types.NewParams(simState.UnbondTime, maxVals, 7, histEntries, sdk.DefaultBondDenom, minComRate, minSelfDel)
 
 	// validators & delegations
 	var (

x/staking/types/params.go

@@ -37,6 +37,11 @@ var (
 	DefaultMinCommissionRate = sdk.ZeroDec()
 )
 
+var (
+	// DefaultMinSelfDelegation is set to 0
+	DefaultMinSelfDelegation = sdk.ZeroInt()
+)
+
 var (
 	KeyUnbondingTime     = []byte("UnbondingTime")
 	KeyMaxValidators     = []byte("MaxValidators")
@@ -45,6 +50,7 @@ var (
 	KeyHistoricalEntries = []byte("HistoricalEntries")
 	KeyPowerReduction    = []byte("PowerReduction")
 	KeyMinCommissionRate = []byte("MinCommissionRate")
+	KeyMinSelfDelegation = []byte("MinSelfDelegation")
 )
 
 var _ paramtypes.ParamSet = (*Params)(nil)
@@ -55,14 +61,15 @@ func ParamKeyTable() paramtypes.KeyTable {
 }
 
 // NewParams creates a new Params instance
-func NewParams(unbondingTime time.Duration, maxValidators, maxEntries, historicalEntries uint32, bondDenom string, minCommissionRate sdk.Dec) Params {
+func NewParams(unbondingTime time.Duration, maxValidators, maxEntries, historicalEntries uint32, bondDenom string, minCommissionRate sdk.Dec, minSelfDelegation sdk.Int) Params {
 	return Params{
 		UnbondingTime:     unbondingTime,
 		MaxValidators:     maxValidators,
 		MaxEntries:        maxEntries,
 		HistoricalEntries: historicalEntries,
 		BondDenom:         bondDenom,
 		MinCommissionRate: minCommissionRate,
+		MinSelfDelegation: minSelfDelegation,
 	}
 }
 
@@ -75,6 +82,7 @@ func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
 		paramtypes.NewParamSetPair(KeyHistoricalEntries, &p.HistoricalEntries, validateHistoricalEntries),
 		paramtypes.NewParamSetPair(KeyBondDenom, &p.BondDenom, validateBondDenom),
 		paramtypes.NewParamSetPair(KeyMinCommissionRate, &p.MinCommissionRate, validateMinCommissionRate),
+		paramtypes.NewParamSetPair(KeyMinSelfDelegation, &p.MinSelfDelegation, validateMinSelfDelegation),
 	}
 }
 
@@ -87,6 +95,7 @@ func DefaultParams() Params {
 		DefaultHistoricalEntries,
 		sdk.DefaultBondDenom,
 		DefaultMinCommissionRate,
+		DefaultMinSelfDelegation,
 	)
 }
 
@@ -235,3 +244,16 @@ func validateMinCommissionRate(i interface{}) error {
 
 	return nil
 }
+
+func validateMinSelfDelegation(i interface{}) error {
+	v, ok := i.(sdk.Int)
+	if !ok {
+		return fmt.Errorf("invalid parameter type: %T", i)
+	}
+
+	if v.IsNegative() {
+		return fmt.Errorf("minimum self delegation cannot be negative: %s", v)
+	}
+
+	return nil
+}