smartcontract: add support for maps in NewParameterFromValue

It's just not possible to use maps in invokers/actors without this. And maps
have too many combinations to try pushing them into a type switch, that's
where reflection kicks in and solves it easily.

Signed-off-by: Roman Khimov <roman@nspcc.ru>

pkg/rpcclient/invoker/invoker_test.go

@@ -83,17 +83,17 @@ func TestInvoker(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, resExp, res)
 
-		_, err = inv.Verify(util.Uint160{}, nil, make(map[int]int))
+		_, err = inv.Verify(util.Uint160{}, nil, make(chan struct{}))
 		require.Error(t, err)
 
-		_, err = inv.Call(util.Uint160{}, "method", make(map[int]int))
+		_, err = inv.Call(util.Uint160{}, "method", make(chan struct{}))
 		require.Error(t, err)
 
 		res, err = inv.CallAndExpandIterator(util.Uint160{}, "method", 10, 42)
 		require.NoError(t, err)
 		require.Equal(t, resExp, res)
 
-		_, err = inv.CallAndExpandIterator(util.Uint160{}, "method", 10, make(map[int]int))
+		_, err = inv.CallAndExpandIterator(util.Uint160{}, "method", 10, make(chan struct{}))
 		require.Error(t, err)
 	}
 	t.Run("standard", func(t *testing.T) {

pkg/smartcontract/parameter.go

@@ -362,6 +362,22 @@ func NewParameterFromValue(value any) (Parameter, error) {
 			}
 			result.Type = ArrayType
 			result.Value = res
+		case reflect.Map:
+			res := make([]ParameterPair, 0, rv.Len())
+			iter := rv.MapRange()
+			for iter.Next() {
+				k, err := NewParameterFromValue(iter.Key().Interface())
+				if err != nil {
+					return result, fmt.Errorf("map key: %w", err)
+				}
+				v, err := NewParameterFromValue(iter.Value().Interface())
+				if err != nil {
+					return result, fmt.Errorf("map value: %w", err)
+				}
+				res = append(res, ParameterPair{Key: k, Value: v})
+			}
+			result.Type = MapType
+			result.Value = res
 		default:
 			return result, fmt.Errorf("%w: %T type", errors.ErrUnsupported, value)
 		}

pkg/smartcontract/parameter_test.go

@@ -888,11 +888,57 @@ func TestParameterFromValue(t *testing.T) {
 		},
 		{
 			value:   make(map[string]int),
-			err:   "unsupported operation: map[string]int type",
+			expType: MapType,
+			expVal:  []ParameterPair{},
 		},
 		{
-			value: []any{1, 2, make(map[string]int)},
-			err:   "unsupported operation: map[string]int type",
+			value:   make(map[string]int),
+			expType: MapType,
+			expVal:  []ParameterPair{},
+		},
+		{
+			value:   map[string]string{"key": "value"},
+			expType: MapType,
+			expVal: []ParameterPair{{
+				Key: Parameter{
+					Type:  StringType,
+					Value: "key",
+				},
+				Value: Parameter{
+					Type:  StringType,
+					Value: "value",
+				},
+			}},
+		},
+		{
+			value:   map[int]int64{42: 100500},
+			expType: MapType,
+			expVal: []ParameterPair{{
+				Key: Parameter{
+					Type:  IntegerType,
+					Value: big.NewInt(42),
+				},
+				Value: Parameter{
+					Type:  IntegerType,
+					Value: big.NewInt(100500),
+				},
+			}},
+		},
+		{
+			value: make(chan int),
+			err:   "unsupported operation: chan int type",
+		},
+		{
+			value: []any{1, 2, make(chan int)},
+			err:   "unsupported operation: chan int type",
+		},
+		{
+			value: map[string]chan int{"aaa": make(chan int)},
+			err:   "unsupported operation: chan int type",
+		},
+		{
+			value: map[error]string{errors.New("some"): "value"},
+			err:   "unsupported operation: *errors.errorString type",
 		},
 	}
 
@@ -924,6 +970,6 @@ func TestParametersFromValues(t *testing.T) {
 		Type:  ByteArrayType,
 		Value: []byte{3, 2, 1},
 	}}, res)
-	_, err = NewParametersFromValues(42, make(map[int]int), []byte{3, 2, 1})
+	_, err = NewParametersFromValues(42, make(chan int), []byte{3, 2, 1})
 	require.Error(t, err)
 }