wrap objects and tuples in lists by default

rlp.nim

@@ -279,9 +279,17 @@ proc read*[E](rlp: var Rlp, T: typedesc[seq[E]]): T =
   for elem in rlp:
     result.add rlp.read(E)
 
-proc read*(rlp: var Rlp, T: typedesc[object|tuple]): T =
+proc read*(rlp: var Rlp, T: typedesc[object|tuple],
+           wrappedInList = wrapObjectsInList): T =
   mixin enumerateRlpFields, read
 
+  if wrappedInList:
+    var
+      payloadOffset = rlp.payloadOffset()
+      payloadEnd = rlp.position + payloadOffset + rlp.payloadBytesCount()
+
+    rlp.position += payloadOffset
+
   template op(field) =
     field = rlp.read(type(field))
 
@@ -306,7 +314,7 @@ proc decode*(bytes: openarray[byte]): RlpNode =
     bytesCopy = @bytes
     rlp = rlpFromBytes initBytesRange(bytesCopy)
   return rlp.toNodes
-  
+
 
 template decode*(bytes: BytesRange, T: typedesc): untyped =
   var rlp = rlpFromBytes bytes

rlp/writer.nim

@@ -25,6 +25,9 @@ type
 
   Integer* = SomeOrdinal or IntLike or uint or uint64
 
+const
+  wrapObjectsInList* = true
+
 proc bytesNeeded(num: Integer): int =
   var n = num
   while n != 0:
@@ -172,8 +175,15 @@ proc append*[T](self; list: seq[T]) =
   for i in 0 ..< list.len:
     self.append list[i]
 
-proc append*(self; data: object|tuple) =
+proc append*(self; data: object|tuple, wrapInList = wrapObjectsInList) =
   mixin enumerateRlpFields, append
+
+  if wrapInList:
+    var fieldsCount = 0
+    template countFields(x) = inc fieldsCount
+    enumerateRlpFields(data, countFields)
+    self.startList(fieldsCount)
+
   template op(x) = append(self, x)
   enumerateRlpFields(data, op)
 

tests/test_object_serialization.nim

@@ -30,7 +30,6 @@ test "encoding and decoding an object":
                         f: Foo(x: 5'u64, y: "hocus pocus", z: @[100, 200, 300]))
 
   var bytes = encode(originalBar)
-
   var r = rlpFromBytes(bytes)
   var restoredBar = r.read(Bar)