From fcc879a4ecd0eecc69435ae950eb1b34d2f49a2c Mon Sep 17 00:00:00 2001
From: Carlos Rodriguez <crodveg@gmail.com>
Date: Sun, 12 Jun 2022 22:30:15 +0200
Subject: [PATCH 1/2] sample upgrade handler to run migration to support denoms
 with slashes

---
 testing/simapp/app.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/testing/simapp/app.go b/testing/simapp/app.go
index 94d5640aa17..2a7b814b3d7 100644
--- a/testing/simapp/app.go
+++ b/testing/simapp/app.go
@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"reflect"
 
 	"github.com/gorilla/mux"
 	"github.com/rakyll/statik/fs"
@@ -602,6 +603,31 @@ func NewSimApp(
 
 	app.SetEndBlocker(app.EndBlocker)
 
+	app.UpgradeKeeper.SetUpgradeHandler("supportSlashedDenomsUpgrade",
+		func(ctx sdk.Context, _ upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
+			// list of traces that must replace the old traces in store
+			var newTraces []ibctransfertypes.DenomTrace
+			app.TransferKeeper.IterateDenomTraces(ctx,
+				func(dt ibctransfertypes.DenomTrace) bool {
+					// check if the new way of splitting FullDenom
+					// into Trace and BaseDenom is the same as the current
+					// DenomTrace.
+					// If it isn't then store the new DenomTrace in the list of new traces.
+					newTrace := ibctransfertypes.ParseDenomTrace(dt.GetFullDenomPath())
+					if !reflect.DeepEqual(newTrace, dt) {
+						newTraces = append(newTraces, newTrace)
+					}
+					return false
+				})
+
+			// replace the outdated traces with the new trace information
+			for _, nt := range newTraces {
+				app.TransferKeeper.SetDenomTrace(ctx, nt)
+			}
+
+			return app.mm.RunMigrations(ctx, app.configurator, fromVM)
+		})
+
 	if loadLatest {
 		if err := app.LoadLatestVersion(); err != nil {
 			tmos.Exit(err.Error())

From 7a164eef80ef341dea0d03a4d22eda510f40497a Mon Sep 17 00:00:00 2001
From: crodriguezvega <carlos@interchain.io>
Date: Mon, 13 Jun 2022 20:56:54 +0200
Subject: [PATCH 2/2] add validation check of denom trace

---
 testing/simapp/app.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/testing/simapp/app.go b/testing/simapp/app.go
index 2a7b814b3d7..1649394f736 100644
--- a/testing/simapp/app.go
+++ b/testing/simapp/app.go
@@ -610,13 +610,14 @@ func NewSimApp(
 			app.TransferKeeper.IterateDenomTraces(ctx,
 				func(dt ibctransfertypes.DenomTrace) bool {
 					// check if the new way of splitting FullDenom
-					// into Trace and BaseDenom is the same as the current
-					// DenomTrace.
+					// into Trace and BaseDenom passes validation and
+					// is the same as the current DenomTrace.
 					// If it isn't then store the new DenomTrace in the list of new traces.
 					newTrace := ibctransfertypes.ParseDenomTrace(dt.GetFullDenomPath())
-					if !reflect.DeepEqual(newTrace, dt) {
+					if err := newTrace.Validate(); err == nil && !reflect.DeepEqual(newTrace, dt) {
 						newTraces = append(newTraces, newTrace)
 					}
+
 					return false
 				})