feat: catching PARSING_ERR for return/error type mismatch

Author: eigen-value

src/client.h

@@ -68,6 +68,9 @@ class RPCClient {
             lastError.code = tmp_error.code;
             lastError.traceback = tmp_error.traceback;
             return true;
+        } else if (tmp_error.code == PARSING_ERR) {     // catches the parsing error
+            lastError.code = tmp_error.code;
+            lastError.traceback = tmp_error.traceback;
         }
         return false;
     }

src/decoder.h

@@ -76,9 +76,17 @@ class RpcDecoder {
 
         MsgPack::object::nil_t nil;
         if (unpacker.unpackable(nil)){  // No error
-            if (!unpacker.deserialize(nil, result)) return false;
+            if (!unpacker.deserialize(nil, result)) {
+                error.code = PARSING_ERR;
+                error.traceback = "Result not parsable (check type)";
+                return false;
+            }
         } else {                        // RPC returned an error
-            if (!unpacker.deserialize(error, nil)) return false;
+            if (!unpacker.deserialize(error, nil)) {
+                error.code = PARSING_ERR;
+                error.traceback = "RPC Error not parsable (check type)";
+                return false;
+            }
         }
 
         reset_packet();

src/error.h

@@ -17,6 +17,7 @@
 #include "MsgPack.h"
 
 #define NO_ERR                   0x00
+#define PARSING_ERR              0xFC
 #define MALFORMED_CALL_ERR       0xFD
 #define FUNCTION_NOT_FOUND_ERR   0xFE
 #define GENERIC_ERR              0xFF