Add marshal error type and marshal helper function that wraps json-it…

…erator marshal call

errortypes/code.go

@@ -15,6 +15,7 @@ const (
 	MalformedAcctErrorCode
 	ModuleRejectionErrorCode
 	TmaxTimeoutErrorCode
+	FailedToMarshalErrorCode
 	FailedToUnmarshalErrorCode
 )
 

errortypes/errortypes.go

@@ -237,3 +237,20 @@ func (err *FailedToUnmarshal) Code() int {
 func (err *FailedToUnmarshal) Severity() Severity {
 	return SeverityFatal
 }
+
+// FailedToMarshal should be used to represent errors that occur when marshaling to a byte slice.
+type FailedToMarshal struct {
+	Message string
+}
+
+func (err *FailedToMarshal) Error() string {
+	return err.Message
+}
+
+func (err *FailedToMarshal) Code() int {
+	return FailedToMarshalErrorCode
+}
+
+func (err *FailedToMarshal) Severity() Severity {
+	return SeverityFatal
+}

util/jsonutil/jsonutil.go

@@ -140,3 +140,15 @@ func UnmarshalValid(data []byte, v interface{}) error {
 	}
 	return nil
 }
+
+// Marshal marshals a data structure into a byte slice without performing any validation
+// on the data. A marshal error is returned if a non-validation error occurs.
+func Marshal(v interface{}) ([]byte, error) {
+	data, err := jsoniter.ConfigCompatibleWithStandardLibrary.Marshal(v)
+	if err != nil {
+		return nil, &errortypes.FailedToMarshal{
+			Message: err.Error(),
+		}
+	}
+	return data, nil
+}