Problem: don't support hardfork style upgrades

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## UNRELEASED
+
+- [#1258](https://github.com/crypto-org-chain/cronos/pull/1258) Support hard-fork style upgrades.
+
 *December 11, 2023*
 
 ## v1.1.0-rc2

app/app.go

@@ -175,6 +175,8 @@ const (
 	FlagBlockedAddresses = "blocked-addresses"
 )
 
+var Forks = []Fork{}
+
 // this line is used by starport scaffolding # stargate/wasm/app/enabledProposals
 
 func getGovProposalHandlers() []govclient.ProposalHandler {
@@ -983,6 +985,7 @@ func (app *App) PreBlocker(ctx sdk.Context, req abci.RequestBeginBlock) (sdk.Res
 
 // BeginBlocker application updates every begin block
 func (app *App) BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) abci.ResponseBeginBlock {
+	BeginBlockForks(ctx, app)
 	return app.mm.BeginBlock(ctx, req)
 }
 

app/forks.go

@@ -0,0 +1,30 @@
+package app
+
+import sdk "github.com/cosmos/cosmos-sdk/types"
+
+// Fork defines a struct containing the requisite fields for a non-software upgrade proposal
+// Hard Fork at a given height to implement.
+// There is one time code that can be added for the start of the Fork, in `BeginForkLogic`.
+// Any other change in the code should be height-gated, if the goal is to have old and new binaries
+// to be compatible prior to the upgrade height.
+//
+// Adapted from osmosis: https://github.com/osmosis-labs/osmosis/blob/057192c2c0949fde5673a5f314bf41816f808fd9/app/upgrades/types.go#L40
+type Fork struct {
+	// Upgrade version name, for the upgrade handler, e.g. `v7`
+	UpgradeName string
+	// height the upgrade occurs at
+	UpgradeHeight int64
+
+	// Function that runs some custom state transition code at the beginning of a fork.
+	BeginForkLogic func(ctx sdk.Context, app *App)
+}
+
+// BeginBlockForks is intended to be ran in a chain upgrade.
+func BeginBlockForks(ctx sdk.Context, app *App) {
+	for _, fork := range Forks {
+		if ctx.BlockHeight() == fork.UpgradeHeight {
+			fork.BeginForkLogic(ctx, app)
+			return
+		}
+	}
+}