Fix log topics (#14)

adds serde log topics

moves `logScope` into routine scope due to a bug in chronicles

serde/json/deserializer.nim

@@ -27,9 +27,6 @@ export types
 
 {.push raises: [].}
 
-logScope:
-  topics = "json deserialization"
-
 template expectJsonKind(
     expectedType: type, expectedKinds: set[JsonNodeKind], json: JsonNode
 ) =
@@ -188,6 +185,10 @@ proc fromJson*[T: ref object or object](_: type T, json: JsonNode): ?!T =
     let isOptionalValue = typeof(value) is Option
     var skip = false # workaround for 'continue' not supported in a 'fields' loop
 
+    # logScope moved into proc due to chronicles issue: https://github.com/status-im/nim-chronicles/issues/148
+    logScope:
+      topics = "serde json deserialization"
+
     case mode
     of Strict:
       if opts.key notin json:

serde/json/serializer.nim

@@ -20,9 +20,6 @@ export types
 
 {.push raises: [].}
 
-logScope:
-  topics = "json serialization"
-
 proc `%`*(s: string): JsonNode =
   newJString(s)
 
@@ -99,6 +96,10 @@ proc `%`*[T: object or ref object](obj: T): JsonNode =
     let hasSerialize = value.hasCustomPragma(serialize)
     var skip = false # workaround for 'continue' not supported in a 'fields' loop
 
+    # logScope moved into proc due to chronicles issue: https://github.com/status-im/nim-chronicles/issues/148
+    logScope:
+      topics = "serde json serialization"
+
     case mode
     of OptIn:
       if not hasSerialize: