Adding iodine error conversion

pkg/iodine/iodine.go

@@ -19,6 +19,7 @@ package iodine
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path"
@@ -93,6 +94,27 @@ func GetGlobalStateKey(k string) string {
 	return result
 }
 
+func ToError(err error) error {
+	switch err := err.(type) {
+	case nil:
+		{
+			return nil
+		}
+	case Error:
+		{
+			if err.EmbeddedError != nil {
+				return err.EmbeddedError
+			} else {
+				return errors.New(err.ErrorMessage)
+			}
+		}
+	default:
+		{
+			return err
+		}
+	}
+}
+
 // New - instantiate an error, turning it into an iodine error.
 // Adds an initial stack trace.
 func New(err error, data map[string]string) error {

pkg/iodine/iodine_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 
 	"encoding/json"
+	"os"
 )
 
 func TestIodine(t *testing.T) {
@@ -101,3 +102,15 @@ func TestState(t *testing.T) {
 		}
 	}
 }
+
+func TestToError(t *testing.T) {
+	_, err := os.Stat("hello")
+	ierr := New(err, nil)
+	if ToError(ierr) != err {
+		t.Error("Error is not the same")
+	}
+	ierr = New(ierr, nil)
+	if ToError(ierr) != err {
+		t.Error("Stacked Error is not the same")
+	}
+}