rpc/client: add support for notification filters

Differing a bit from #895 draft specification, we won't add `sender` or
`cosigner` to `transaction_executed`.

pkg/rpc/request/param_test.go

@@ -13,7 +13,15 @@ import (
 )
 
 func TestParam_UnmarshalJSON(t *testing.T) {
-	msg := `["str1", 123, ["str2", 3], [{"type": "String", "value": "jajaja"}]]`
+	msg := `["str1", 123, ["str2", 3], [{"type": "String", "value": "jajaja"}],
+                 {"primary": 1},
+                 {"sender": "f84d6a337fbc3d3a201d41da99e86b479e7a2554"},
+                 {"cosigner": "f84d6a337fbc3d3a201d41da99e86b479e7a2554"},
+                 {"sender": "f84d6a337fbc3d3a201d41da99e86b479e7a2554", "cosigner": "f84d6a337fbc3d3a201d41da99e86b479e7a2554"},
+                 {"contract": "f84d6a337fbc3d3a201d41da99e86b479e7a2554"},
+                 {"state": "HALT"}]`
+	contr, err := util.Uint160DecodeStringLE("f84d6a337fbc3d3a201d41da99e86b479e7a2554")
+	require.NoError(t, err)
 	expected := Params{
 		{
 			Type:  StringT,
@@ -51,6 +59,30 @@ func TestParam_UnmarshalJSON(t *testing.T) {
 				},
 			},
 		},
+		{
+			Type:  BlockFilterT,
+			Value: BlockFilter{Primary: 1},
+		},
+		{
+			Type:  TxFilterT,
+			Value: TxFilter{Sender: &contr},
+		},
+		{
+			Type:  TxFilterT,
+			Value: TxFilter{Cosigner: &contr},
+		},
+		{
+			Type:  TxFilterT,
+			Value: TxFilter{Sender: &contr, Cosigner: &contr},
+		},
+		{
+			Type:  NotificationFilterT,
+			Value: NotificationFilter{Contract: contr},
+		},
+		{
+			Type:  ExecutionFilterT,
+			Value: ExecutionFilter{State: "HALT"},
+		},
 	}
 
 	var ps Params