package vm_test import ( "fmt" "strings" "testing" "github.com/CityOfZion/neo-go/pkg/compiler" "github.com/CityOfZion/neo-go/pkg/vm" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) type testCase struct { name string src string result interface{} } func runTestCases(t *testing.T, tcases []testCase) { for _, tcase := range tcases { t.Run(tcase.name, func(t *testing.T) { eval(t, tcase.src, tcase.result) }) } } func eval(t *testing.T, src string, result interface{}) { vm := vmAndCompile(t, src) err := vm.Run() require.NoError(t, err) assertResult(t, vm, result) } func evalWithArgs(t *testing.T, src string, op []byte, args []vm.StackItem, result interface{}) { vm := vmAndCompile(t, src) vm.LoadArgs(op, args) err := vm.Run() require.NoError(t, err) assertResult(t, vm, result) } func assertResult(t *testing.T, vm *vm.VM, result interface{}) { assert.Equal(t, result, vm.PopResult()) assert.Equal(t, 0, vm.Astack().Len()) assert.Equal(t, 0, vm.Istack().Len()) } func vmAndCompile(t *testing.T, src string) *vm.VM { vm := vm.New() storePlugin := newStoragePlugin() vm.RegisterInteropFunc("Neo.Storage.Get", storePlugin.Get, 1) vm.RegisterInteropFunc("Neo.Storage.Put", storePlugin.Put, 1) vm.RegisterInteropFunc("Neo.Storage.GetContext", storePlugin.GetContext, 1) b, err := compiler.Compile(strings.NewReader(src)) if err != nil { t.Fatal(err) } vm.Load(b) return vm } type storagePlugin struct { mem map[string][]byte } func newStoragePlugin() *storagePlugin { return &storagePlugin{ mem: make(map[string][]byte), } } func (s *storagePlugin) Delete(vm *vm.VM) error { vm.Estack().Pop() key := vm.Estack().Pop().Bytes() delete(s.mem, string(key)) return nil } func (s *storagePlugin) Put(vm *vm.VM) error { vm.Estack().Pop() key := vm.Estack().Pop().Bytes() value := vm.Estack().Pop().Bytes() s.mem[string(key)] = value return nil } func (s *storagePlugin) Get(vm *vm.VM) error { vm.Estack().Pop() item := vm.Estack().Pop().Bytes() if val, ok := s.mem[string(item)]; ok { vm.Estack().PushVal(val) return nil } return fmt.Errorf("could not find %+v", item) } func (s *storagePlugin) GetContext(vm *vm.VM) error { // Pushing anything on the stack here will work. This is just to satisfy // the compiler, thinking it has pushed the context ^^. vm.Estack().PushVal(10) return nil }