feat: Add a function to initialize the ICS27 module via an upgrade proposal

CHANGELOG.md

@@ -64,6 +64,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (interchain-accounts) [\#1037](https://github.com/cosmos/ibc-go/pull/1037) Add a function `InitModule` to the interchain accounts `AppModule`. This function should be called within the upgrade handler when adding the interchain accounts module to a chain. It should be called in place of InitGenesis (set the consensus version in the version map).
 * (testing) [\#942](https://github.com/cosmos/ibc-go/pull/942) `NewTestChain` will create 4 validators in validator set by default. A new constructor function `NewTestChainWithValSet` is provided for test writers who want custom control over the validator set of test chains.
 * (testing) [\#904](https://github.com/cosmos/ibc-go/pull/904) Add `ParsePacketFromEvents` function to the testing package. Useful when sending/relaying packets via the testing package.
 * (testing) [\#893](https://github.com/cosmos/ibc-go/pull/893) Support custom private keys for testing.

docs/migrations/v2-to-v3.md

@@ -33,17 +33,24 @@ Please see the [ICS27 documentation](../apps/interchain-accounts/overview.md) fo
 If the chain will adopt ICS27, it must set the appropriate params during the execution of the upgrade handler in `app.go`: 
 ```go
 app.UpgradeKeeper.SetUpgradeHandler("v3",
-    func(ctx sdk.Context, _ upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
-        // set ICS27 Host submodule params
-        app.ICAHostKeeper.SetParams(ctx, icahosttypes.Params{
-            HostEnabled: true, 
-            AllowMessages: []string{"/cosmos.bank.v1beta1.MsgSend", ...], 
-        })
+    func(ctx sdk.Context, _ upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
+        // set the ICS27 consensus version so InitGenesis is not run
+        fromVM[icatypes.ModuleName] = icamodule.ConsensusVersion()
 
-        // set ICS27 Controller submodule params
-        app.ICAControllerKeeper.SetParams(ctx, icacontrollertypes.Params{
+
+        // create ICS27 Controller submodule params
+        controllerParams := icacontrollertypes.Params{
             ControllerEnabled: true, 
-        })
+        }
+
+        // create ICS27 Host submodule params
+        hostParams := icahosttypes.Params{
+            HostEnabled: true, 
+            AllowMessages: []string{"/cosmos.bank.v1beta1.MsgSend", ...], 
+        }
+
+        // initialize ICS27 module
+        icamodule.InitModule(ctx, controllerParams, hostParams)
 
         ...
 

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

@@ -24,6 +24,7 @@ import (
 	hosttypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/host/types"
 	"github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/types"
 	porttypes "github.com/cosmos/ibc-go/v3/modules/core/05-port/types"
+	ibchost "github.com/cosmos/ibc-go/v3/modules/core/24-host"
 )
 
 var (
@@ -101,6 +102,18 @@ func NewAppModule(controllerKeeper *controllerkeeper.Keeper, hostKeeper *hostkee
 	}
 }
 
+// InitModule will initialize the interchain accounts moudule. It should only be
+// called once and as an alternative to InitGenesis.
+func (am AppModule) InitModule(ctx sdk.Context, controllerParams controllertypes.Params, hostParams hosttypes.Params) {
+	am.controllerKeeper.SetParams(ctx, controllerParams)
+	am.hostKeeper.SetParams(ctx, hostParams)
+
+	cap := am.hostKeeper.BindPort(ctx, types.PortID)
+	if err := am.hostKeeper.ClaimCapability(ctx, cap, ibchost.PortPath(types.PortID)); err != nil {
+		panic(fmt.Sprintf("could not claim port capability: %v", err))
+	}
+}
+
 // RegisterInvariants implements the AppModule interface
 func (AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
 }

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

@@ -0,0 +1,74 @@
+package ica_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/tendermint/tendermint/libs/log"
+	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
+	dbm "github.com/tendermint/tm-db"
+
+	ica "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts"
+	controllertypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/controller/types"
+	hosttypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/host/types"
+	"github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/types"
+	ibctesting "github.com/cosmos/ibc-go/v3/testing"
+	"github.com/cosmos/ibc-go/v3/testing/simapp"
+)
+
+type InterchainAccountsTestSuite struct {
+	suite.Suite
+
+	coordinator *ibctesting.Coordinator
+}
+
+func TestICATestSuite(t *testing.T) {
+	suite.Run(t, new(InterchainAccountsTestSuite))
+}
+
+func (suite *InterchainAccountsTestSuite) SetupTest() {
+	suite.coordinator = ibctesting.NewCoordinator(suite.T(), 2)
+}
+
+func (suite *InterchainAccountsTestSuite) TestInitModule() {
+	app := simapp.NewSimApp(log.NewNopLogger(), dbm.NewMemDB(), nil, true, map[int64]bool{}, simapp.DefaultNodeHome, 5, simapp.MakeTestEncodingConfig(), simapp.EmptyAppOptions{})
+	icamodule, ok := app.GetModuleManager().Modules[types.ModuleName].(ica.AppModule)
+	suite.Require().True(ok)
+
+	header := tmproto.Header{
+		ChainID: "testchain",
+		Height:  1,
+		Time:    suite.coordinator.CurrentTime.UTC(),
+	}
+
+	ctx := app.GetBaseApp().NewContext(true, header)
+
+	// ensure params are not set
+	suite.Require().Panics(func() {
+		app.ICAControllerKeeper.GetParams(ctx)
+	})
+	suite.Require().Panics(func() {
+		app.ICAHostKeeper.GetParams(ctx)
+	})
+
+	controllerParams := controllertypes.DefaultParams()
+	controllerParams.ControllerEnabled = true
+
+	hostParams := hosttypes.DefaultParams()
+	expAllowMessages := []string{"sdk.Msg"}
+	hostParams.HostEnabled = true
+	hostParams.AllowMessages = expAllowMessages
+
+	suite.Require().False(app.IBCKeeper.PortKeeper.IsBound(ctx, types.PortID))
+
+	icamodule.InitModule(ctx, controllerParams, hostParams)
+
+	controllerParams = app.ICAControllerKeeper.GetParams(ctx)
+	suite.Require().True(controllerParams.ControllerEnabled)
+
+	hostParams = app.ICAHostKeeper.GetParams(ctx)
+	suite.Require().True(hostParams.HostEnabled)
+	suite.Require().Equal(expAllowMessages, hostParams.AllowMessages)
+
+	suite.Require().True(app.IBCKeeper.PortKeeper.IsBound(ctx, types.PortID))
+}

testing/simapp/app.go

@@ -571,6 +571,12 @@ func (app *SimApp) ModuleAccountAddrs() map[string]bool {
 	return modAccAddrs
 }
 
+// GetModuleManager returns the app module manager
+// NOTE: used for testing purposes
+func (app *SimApp) GetModuleManager() *module.Manager {
+	return app.mm
+}
+
 // LegacyAmino returns SimApp's amino codec.
 //
 // NOTE: This is solely to be used for testing purposes as it may be desirable