From af264b8cfc08627881a9fdfb5b0cf69092d603d6 Mon Sep 17 00:00:00 2001
From: jhernandezb <contact@jhernandez.me>
Date: Fri, 26 Aug 2022 22:34:39 -0600
Subject: [PATCH] add denom traces migration

---
 .drone.yml      |  8 ++++----
 app/upgrades.go | 25 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/.drone.yml b/.drone.yml
index 763774cd4..29287b682 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -75,12 +75,12 @@ steps:
       password:
         from_secret: docker_password
       tags:
-        - v7-alpha
+        - v7-rc
     when:
       event:
         - push
       branch:
-        - ica-testing
+        - add-denom-traces-migration
   - name: docker_release
     image: plugins/docker:18
     settings:
@@ -341,7 +341,7 @@ steps:
       - ./scripts/ci/upgrade/proposal.sh
   - name: stargaze-upgraded
     pull: true
-    image: publicawesome/stargaze:v7-alpha
+    image: publicawesome/stargaze:v7-rc
     commands:
       - ./scripts/ci/upgrade/run-upgrade.sh
     environment:
@@ -396,6 +396,6 @@ depends_on:
   - ibc-integration-test
 ---
 kind: signature
-hmac: 0b778bfb2eaa3b852127d6a595c16dcd3aa9697d7e6cc50d172deccf8eb4b9ab
+hmac: 83236df0cf43bf7972a6a9c949af5d1c0b01791cb081b0f03d2d6e2d6ddc40cc
 
 ...
diff --git a/app/upgrades.go b/app/upgrades.go
index 0bda06156..f8a2ca0c8 100644
--- a/app/upgrades.go
+++ b/app/upgrades.go
@@ -15,11 +15,16 @@ import (
 	icacontrollertypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/controller/types"
 	icahosttypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/host/types"
 	icatypes "github.com/cosmos/ibc-go/v3/modules/apps/27-interchain-accounts/types"
+	ibctransfertypes "github.com/cosmos/ibc-go/v3/modules/apps/transfer/types"
 )
 
 // next upgrade name
 const upgradeName = "v7"
 
+func equalTraces(dtA, dtB ibctransfertypes.DenomTrace) bool {
+	return dtA.BaseDenom == dtB.BaseDenom && dtA.Path == dtB.Path
+}
+
 // RegisterUpgradeHandlers returns upgrade handlers
 func (app *App) RegisterUpgradeHandlers(cfg module.Configurator) {
 	app.UpgradeKeeper.SetUpgradeHandler(upgradeName, func(ctx sdk.Context, plan upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
@@ -51,6 +56,26 @@ func (app *App) RegisterUpgradeHandlers(cfg module.Configurator) {
 		}
 		// initialize ICS27 module
 		icamodule.InitModule(ctx, controllerParams, hostParams)
+
+		// fix denom traces
+		// 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 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 err := newTrace.Validate(); err == nil && !equalTraces(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, cfg, fromVM)
 	})