feat(core,runtime): transaction service (exec mode) (#19953)

core/CHANGELOG.md

@@ -38,6 +38,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* [#19953](https://github.com/cosmos/cosmos-sdk/pull/19953) Add transaction service.
 * [#18379](https://github.com/cosmos/cosmos-sdk/pull/18379) Add branch service.
 * [#18457](https://github.com/cosmos/cosmos-sdk/pull/18457) Add branch.ExecuteWithGasLimit.
 * [#19041](https://github.com/cosmos/cosmos-sdk/pull/19041) Add `appmodule.Environment` interface to fetch different services

core/appmodule/v2/environment.go

@@ -7,6 +7,7 @@ import (
 	"cosmossdk.io/core/header"
 	"cosmossdk.io/core/router"
 	"cosmossdk.io/core/store"
+	"cosmossdk.io/core/transaction"
 	"cosmossdk.io/log"
 )
 
@@ -14,11 +15,12 @@ import (
 type Environment struct {
 	Logger log.Logger
 
-	BranchService branch.Service
-	EventService  event.Service
-	GasService    gas.Service
-	HeaderService header.Service
-	RouterService router.Service
+	BranchService      branch.Service
+	EventService       event.Service
+	GasService         gas.Service
+	HeaderService      header.Service
+	RouterService      router.Service
+	TransactionService transaction.Service
 
 	KVStoreService  store.KVStoreService
 	MemStoreService store.MemoryStoreService

core/transaction/service.go

@@ -0,0 +1,24 @@
+package transaction
+
+import "context"
+
+// ExecMode defines the execution mode
+type ExecMode uint8
+
+// All possible execution modes.
+// For backwards compatibility and easier casting, the exec mode values must be the same as in cosmos/cosmos-sdk/types package.
+const (
+	ExecModeCheck ExecMode = iota
+	_
+	ExecModeSimulate
+	_
+	_
+	_
+	_
+	ExecModeFinalize
+)
+
+// Service creates a transaction service.
+type Service interface {
+	ExecMode(ctx context.Context) ExecMode
+}