chore: attempt to improve OriginCall funcs

`AssertOriginCall` and `IsOriginCall` relies on the number of frames to
determine if the function was called by a gno transaction (definition
taken from `examples/gno.land/r/demo/banktest/README.md`). Since this
number is different in the context of test and filetest, the 2 functions
are overrided during test setup, but the override works only for
filetest files and not for test files.

This change makes `AssertOriginCall` and `IsOriginCall` to rely on
message's signers instead of frames. If the message has at east one
signer, we consider the function was called by a gno tx. As a result,
the functions no longer needs to be overrided in test setup, and they
work both for filetest files and test files.

Fix gnolang#481

stdlibs/stdlibs.go

@@ -114,15 +114,16 @@ func InjectPackage(store gno.Store, pn *gno.PackageNode) {
 		pn.DefineGoNativeValue("IntSize", strconv.IntSize)
 		pn.DefineGoNativeValue("AppendUint", strconv.AppendUint)
 	case "std":
-		// NOTE: some of these are overridden in tests/imports_test.go
+		// NOTE: some of these are overridden in tests/imports.go
 		// Also see stdlibs/InjectPackage.
 		pn.DefineNative("AssertOriginCall",
 			gno.Flds( // params
 			),
 			gno.Flds( // results
 			),
 			func(m *gno.Machine) {
-				isOrigin := len(m.Frames) == 2
+				ctx := m.Context.(ExecContext)
+				isOrigin := ctx.Msg != nil && len(ctx.Msg.GetSigners()) > 0
 				if !isOrigin {
 					panic("invalid non-origin call")
 				}
@@ -135,7 +136,8 @@ func InjectPackage(store gno.Store, pn *gno.PackageNode) {
 				"isOrigin", "bool",
 			),
 			func(m *gno.Machine) {
-				isOrigin := len(m.Frames) == 2
+				ctx := m.Context.(ExecContext)
+				isOrigin := ctx.Msg != nil && len(ctx.Msg.GetSigners()) > 0
 				res0 := gno.TypedValue{T: gno.BoolType}
 				res0.SetBool(isOrigin)
 				m.PushValue(res0)

tests/file.go

@@ -15,6 +15,7 @@ import (
 	"github.com/gnolang/gno/pkgs/crypto"
 	gno "github.com/gnolang/gno/pkgs/gnolang"
 	osm "github.com/gnolang/gno/pkgs/os"
+	"github.com/gnolang/gno/pkgs/sdk/testutils"
 	"github.com/gnolang/gno/pkgs/std"
 	"github.com/gnolang/gno/stdlibs"
 )
@@ -41,7 +42,7 @@ func testMachineCustom(store gno.Store, pkgPath string, stdout io.Writer, maxAll
 		ChainID:       "dev",
 		Height:        123,
 		Timestamp:     1234567890,
-		Msg:           nil,
+		Msg:           testutils.NewTestMsg(caller),
 		OrigCaller:    caller.Bech32(),
 		OrigPkgAddr:   pkgAddr.Bech32(),
 		OrigSend:      send,

tests/imports.go

@@ -465,36 +465,6 @@ func testPackageInjector(store gno.Store, pn *gno.PackageNode) {
 		pn.DefineGoNativeValue("ParseInt", strconv.ParseInt)
 	case "std":
 		// NOTE: some of these are overrides.
-		// Also see stdlibs/InjectPackage.
-		pn.DefineNativeOverride("AssertOriginCall",
-			/*
-				gno.Flds( // params
-				),
-				gno.Flds( // results
-				),
-			*/
-			func(m *gno.Machine) {
-				isOrigin := len(m.Frames) == 3
-				if !isOrigin {
-					panic("invalid non-origin call")
-				}
-			},
-		)
-		pn.DefineNativeOverride("IsOriginCall",
-			/*
-				gno.Flds( // params
-				),
-				gno.Flds( // results
-					"isOrigin", "bool",
-				),
-			*/
-			func(m *gno.Machine) {
-				isOrigin := len(m.Frames) == 3
-				res0 := gno.TypedValue{T: gno.BoolType}
-				res0.SetBool(isOrigin)
-				m.PushValue(res0)
-			},
-		)
 		pn.DefineNativeOverride("GetCallerAt",
 			/*
 				gno.Flds( // params