remove deprecated support for Option

eth/common/base_rlp.nim

@@ -7,30 +7,17 @@
 
 {.push raises: [].}
 
-import std/typetraits, ./base, ../rlp
+import
+  std/typetraits, ./base, ../rlp, 
+  ../rlp/options as rlp_options
 
-export base, rlp
+export base, rlp, rlp_options
 
-# TODO why is rlp serialization of `Opt` here and not in rlp?
-proc append*[T](w: var RlpWriter, val: Opt[T]) =
-  mixin append
-
-  if val.isSome:
-    w.append(val.get())
-  else:
-    w.append("")
 
 template read*[T](rlp: var Rlp, val: var T) =
   mixin read
   val = rlp.read(type val)
 
-proc read*[T](rlp: var Rlp, val: var Opt[T]) {.raises: [RlpError].} =
-  mixin read
-  if rlp.blobLen != 0:
-    val = Opt.some(rlp.read(T))
-  else:
-    rlp.skipElem
-
 proc read*(rlp: var Rlp, T: type StUint): T {.raises: [RlpError].} =
   if rlp.isBlob:
     let bytes = rlp.toBytes

eth/rlp.nim

@@ -448,9 +448,6 @@ func readImpl(
     else:
       rlp.bytes.len()
 
-  template getUnderlyingType[T](_: Option[T]): untyped =
-    T
-
   template getUnderlyingType[T](_: Opt[T]): untyped =
     T
 
@@ -458,16 +455,6 @@ func readImpl(
     type FieldType {.used.} = type field
     when hasCustomPragmaFixed(RecordType, fieldName, rlpCustomSerialization):
       field = rlp.read(result, FieldType)
-    elif field is Option:
-      # this works for optional fields at the end of an object/tuple
-      # if the optional field is followed by a mandatory field,
-      # custom serialization for a field or for the parent object
-      # will be better
-      type UT = getUnderlyingType(field)
-      if rlp.position < payloadEnd:
-        field = some(rlp.read(UT))
-      else:
-        field = none(UT)
     elif field is Opt:
       # this works for optional fields at the end of an object/tuple
       # if the optional field is followed by a mandatory field,

eth/rlp/options.nim

@@ -1,17 +1,20 @@
-import
-  std/options,
-  ../rlp
+import ../rlp
+import results
 
-proc read*[T](rlp: var Rlp, O: type Option[T]): O {.inline.} =
-  mixin read
-  if not rlp.isEmpty:
-    result = some read(rlp, T)
+proc append*[T](w: var RlpWriter, val: Opt[T]) =
+  mixin append
 
-proc append*(writer: var RlpWriter, value: Option) =
-  if value.isSome:
-    writer.append value.get
+  if val.isSome:
+    w.append(val.get())
   else:
-    writer.append ""
+    w.append("")
+
+proc read*[T](rlp: var Rlp, val: var Opt[T]) {.raises: [RlpError].} =
+  mixin read
+  if rlp.blobLen != 0:
+    val = Opt.some(rlp.read(T))
+  else:
+    rlp.skipElem
 
 export 
-  options, rlp
+  rlp, results