feat: add params for ics27 simulation (backport #2160) (#2214)

* feat: add params for ics27 simulation (#2160)

* add param changes for ics27 simulation

* account for unadded submodules

* fix tests

* Update modules/apps/27-interchain-accounts/module.go

* add app simulation declaration

(cherry picked from commit cd913b8)

# Conflicts:
#	modules/apps/27-interchain-accounts/module.go

* fix conflicts

Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

modules/apps/27-interchain-accounts/module.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"math/rand"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/codec"
@@ -29,8 +30,9 @@ import (
 )
 
 var (
-	_ module.AppModule      = AppModule{}
-	_ module.AppModuleBasic = AppModuleBasic{}
+	_ module.AppModule           = AppModule{}
+	_ module.AppModuleBasic      = AppModuleBasic{}
+	_ module.AppModuleSimulation = AppModule{}
 
 	_ porttypes.IBCModule = host.IBCModule{}
 )
@@ -224,6 +226,11 @@ func (am AppModule) WeightedOperations(_ module.SimulationState) []simtypes.Weig
 	return nil
 }
 
+// RandomizedParams creates randomized ibc-transfer param changes for the simulator.
+func (am AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
+	return simulation.ParamChanges(r, am.controllerKeeper, am.hostKeeper)
+}
+
 // RegisterStoreDecoder registers a decoder for interchain accounts module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore()

modules/apps/27-interchain-accounts/simulation/params.go

@@ -0,0 +1,41 @@
+package simulation
+
+import (
+	"fmt"
+	"math/rand"
+
+	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
+	"github.com/cosmos/cosmos-sdk/x/simulation"
+	gogotypes "github.com/gogo/protobuf/types"
+
+	controllerkeeper "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/keeper"
+	controllertypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
+	hostkeeper "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/host/keeper"
+	hosttypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/host/types"
+	"github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/types"
+)
+
+// ParamChanges defines the parameters that can be modified by param change proposals
+// on the simulation
+func ParamChanges(r *rand.Rand, controllerKeeper *controllerkeeper.Keeper, hostKeeper *hostkeeper.Keeper) []simtypes.ParamChange {
+	var paramChanges []simtypes.ParamChange
+	if controllerKeeper != nil {
+		paramChanges = append(paramChanges, simulation.NewSimParamChange(controllertypes.SubModuleName, string(controllertypes.KeyControllerEnabled),
+			func(r *rand.Rand) string {
+				controllerEnabled := RandomEnabled(r)
+				return fmt.Sprintf("%s", types.ModuleCdc.MustMarshalJSON(&gogotypes.BoolValue{Value: controllerEnabled})) //nolint:gosimple
+			},
+		))
+	}
+
+	if hostKeeper != nil {
+		paramChanges = append(paramChanges, simulation.NewSimParamChange(hosttypes.SubModuleName, string(hosttypes.KeyHostEnabled),
+			func(r *rand.Rand) string {
+				receiveEnabled := RandomEnabled(r)
+				return fmt.Sprintf("%s", types.ModuleCdc.MustMarshalJSON(&gogotypes.BoolValue{Value: receiveEnabled})) //nolint:gosimple
+			},
+		))
+	}
+
+	return paramChanges
+}

modules/apps/27-interchain-accounts/simulation/params_test.go

@@ -0,0 +1,64 @@
+package simulation_test
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	controllertypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
+	hosttypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/host/types"
+	"github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/simulation"
+	"github.com/cosmos/ibc-go/v5/testing/simapp"
+)
+
+func TestParamChanges(t *testing.T) {
+	app := simapp.Setup(false)
+
+	s := rand.NewSource(1)
+	r := rand.New(s)
+
+	expected := []struct {
+		composedKey string
+		key         string
+		simValue    string
+		subspace    string
+	}{
+		{fmt.Sprintf("%s/%s", controllertypes.SubModuleName, controllertypes.KeyControllerEnabled), string(controllertypes.KeyControllerEnabled), "false", controllertypes.SubModuleName},
+		{fmt.Sprintf("%s/%s", hosttypes.SubModuleName, hosttypes.KeyHostEnabled), string(hosttypes.KeyHostEnabled), "true", hosttypes.SubModuleName},
+	}
+
+	paramChanges := simulation.ParamChanges(r, &app.ICAControllerKeeper, &app.ICAHostKeeper)
+	require.Len(t, paramChanges, 2)
+
+	for i, p := range paramChanges {
+		require.Equal(t, expected[i].composedKey, p.ComposedKey())
+		require.Equal(t, expected[i].key, p.Key())
+		require.Equal(t, expected[i].simValue, p.SimValue()(r), p.Key())
+		require.Equal(t, expected[i].subspace, p.Subspace())
+	}
+
+	paramChanges = simulation.ParamChanges(r, &app.ICAControllerKeeper, nil)
+	require.Len(t, paramChanges, 1)
+
+	// the second call to paramChanges causing the controller enabled to be changed to true
+	expected[0].simValue = "true"
+
+	for _, p := range paramChanges {
+		require.Equal(t, expected[0].composedKey, p.ComposedKey())
+		require.Equal(t, expected[0].key, p.Key())
+		require.Equal(t, expected[0].simValue, p.SimValue()(r), p.Key())
+		require.Equal(t, expected[0].subspace, p.Subspace())
+	}
+
+	paramChanges = simulation.ParamChanges(r, nil, &app.ICAHostKeeper)
+	require.Len(t, paramChanges, 1)
+
+	for _, p := range paramChanges {
+		require.Equal(t, expected[1].composedKey, p.ComposedKey())
+		require.Equal(t, expected[1].key, p.Key())
+		require.Equal(t, expected[1].simValue, p.SimValue()(r), p.Key())
+		require.Equal(t, expected[1].subspace, p.Subspace())
+	}
+}