fix: validate proposed genesis state in InitGenesis (#90)

(cherry picked from commit 5bb6779)

middleware/packet-forward-middleware/router/keeper/params.go

@@ -6,19 +6,19 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-// GetSendEnabled retrieves the send enabled boolean from the paramstore
+// GetFeePercentage retrieves the fee percentage for forwarded packets from the store.
 func (k Keeper) GetFeePercentage(ctx sdk.Context) sdk.Dec {
 	var res sdk.Dec
 	k.paramSpace.Get(ctx, types.KeyFeePercentage, &res)
 	return res
 }
 
-// GetParams returns the total set of ibc-transfer parameters.
+// GetParams returns the total set of pfm parameters.
 func (k Keeper) GetParams(ctx sdk.Context) types.Params {
 	return types.NewParams(k.GetFeePercentage(ctx))
 }
 
-// SetParams sets the total set of ibc-transfer parameters.
+// SetParams sets the total set of pfm parameters.
 func (k Keeper) SetParams(ctx sdk.Context, params types.Params) {
 	k.paramSpace.SetParamSet(ctx, &params)
 }

middleware/packet-forward-middleware/router/module.go

@@ -115,6 +115,11 @@ func (am AppModule) RegisterServices(cfg module.Configurator) {
 // InitGenesis performs genesis initialization for the ibc-router module. It returns
 // no validator updates.
 func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, data json.RawMessage) []abci.ValidatorUpdate {
+	err := am.ValidateGenesis(cdc, nil, data)
+	if err != nil {
+		panic(err)
+	}
+
 	var genesisState types.GenesisState
 	cdc.MustUnmarshalJSON(data, &genesisState)
 	am.keeper.InitGenesis(ctx, genesisState)

middleware/packet-forward-middleware/router/types/genesis.go

@@ -1,23 +1,22 @@
 package types
 
-// NewGenesisState creates a 29-fee GenesisState instance.
+// NewGenesisState creates a pfm GenesisState instance.
 func NewGenesisState(params Params, inFlightPackets map[string]InFlightPacket) *GenesisState {
 	return &GenesisState{
 		Params:          params,
 		InFlightPackets: inFlightPackets,
 	}
 }
 
-// DefaultGenesisState returns a GenesisState with "transfer" as the default PortID.
+// DefaultGenesisState returns a GenesisState with a default fee percentage of 0.
 func DefaultGenesisState() *GenesisState {
 	return &GenesisState{
 		Params:          DefaultParams(),
 		InFlightPackets: make(map[string]InFlightPacket),
 	}
 }
 
-// Validate performs basic genesis state validation returning an error upon any
-// failure.
+// Validate performs basic genesis state validation returning an error upon any failure.
 func (gs GenesisState) Validate() error {
 	return gs.Params.Validate()
 }

middleware/packet-forward-middleware/router/types/params.go

@@ -1,47 +1,50 @@
 package types
 
 import (
-	fmt "fmt"
+	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
 )
 
 var (
+	// DefaultFeePercentage is the default value used to extract a fee from all forwarded packets.
 	DefaultFeePercentage = sdk.NewDec(0)
+
 	// KeyFeePercentage is store's key for FeePercentage Params
 	KeyFeePercentage = []byte("FeePercentage")
 )
 
-// ParamKeyTable type declaration for parameters
+// ParamKeyTable type declaration for parameters.
 func ParamKeyTable() paramtypes.KeyTable {
 	return paramtypes.NewKeyTable().RegisterParamSet(&Params{})
 }
 
-// NewParams creates a new parameter configuration for the ibc transfer module
+// NewParams creates a new parameter configuration for the pfm module.
 func NewParams(feePercentage sdk.Dec) Params {
 	return Params{
 		FeePercentage: feePercentage,
 	}
 }
 
-// DefaultParams is the default parameter configuration for the ibc-transfer module
+// DefaultParams is the default parameter configuration for the pfm module.
 func DefaultParams() Params {
 	return NewParams(DefaultFeePercentage)
 }
 
-// Validate all ibc-transfer module parameters
+// Validate the pfm module parameters.
 func (p Params) Validate() error {
 	return validateFeePercentage(p.FeePercentage)
 }
 
-// ParamSetPairs implements params.ParamSet
+// ParamSetPairs implements params.ParamSet.
 func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
 	return paramtypes.ParamSetPairs{
 		paramtypes.NewParamSetPair(KeyFeePercentage, p.FeePercentage, validateFeePercentage),
 	}
 }
 
+// validateFeePercentage asserts that the fee percentage param is a valid sdk.Dec type.
 func validateFeePercentage(i interface{}) error {
 	v, ok := i.(sdk.Dec)
 	if !ok {