imp: adding MetadataFromVersion to 29-fee pkg types (#4100)

* adding MetadataFromVersion func to pkg types

* adding additional error context to MetadataFromVersion

* order imports

modules/apps/29-fee/types/metadata.go

@@ -0,0 +1,15 @@
+package types
+
+import errorsmod "cosmossdk.io/errors"
+
+// MetadataFromVersion attempts to parse the given string into a fee version Metadata,
+// an error is returned if it fails to do so.
+func MetadataFromVersion(version string) (Metadata, error) {
+	var metadata Metadata
+	err := ModuleCdc.UnmarshalJSON([]byte(version), &metadata)
+	if err != nil {
+		return Metadata{}, errorsmod.Wrapf(ErrInvalidVersion, "failed to unmarshal metadata from version: %s", version)
+	}
+
+	return metadata, nil
+}

modules/apps/29-fee/types/metadata_test.go

@@ -0,0 +1,30 @@
+package types_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/cosmos/ibc-go/v7/modules/apps/29-fee/types"
+	ibcmock "github.com/cosmos/ibc-go/v7/testing/mock"
+)
+
+func TestMetadataFromVersion(t *testing.T) {
+	testMetadata := types.Metadata{
+		AppVersion: ibcmock.Version,
+		FeeVersion: types.Version,
+	}
+
+	versionBz, err := types.ModuleCdc.MarshalJSON(&testMetadata)
+	require.NoError(t, err)
+
+	metadata, err := types.MetadataFromVersion(string(versionBz))
+	require.NoError(t, err)
+	require.Equal(t, ibcmock.Version, metadata.AppVersion)
+	require.Equal(t, types.Version, metadata.FeeVersion)
+
+	metadata, err = types.MetadataFromVersion("")
+	require.Error(t, err)
+	require.ErrorIs(t, err, types.ErrInvalidVersion)
+	require.Empty(t, metadata)
+}