From 2e1b699a875e8477393e2d32f2f7b23209dcce07 Mon Sep 17 00:00:00 2001
From: Tobie Morgan Hitchcock <tobie@abcum.com>
Date: Wed, 20 Nov 2019 13:10:34 +0000
Subject: [PATCH] Improve memory allocations when data.Doc cloning

---
 util/data/data.go |  3 ++-
 util/dupe/dupe.go | 62 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 1 deletion(-)
 create mode 100644 util/dupe/dupe.go

diff --git a/util/data/data.go b/util/data/data.go
index 5ad45a0e..1a9f8120 100644
--- a/util/data/data.go
+++ b/util/data/data.go
@@ -22,6 +22,7 @@ import (
 
 	"encoding/json"
 
+	"github.com/abcum/surreal/util/dupe"
 	"github.com/abcum/surreal/util/pack"
 )
 
@@ -66,7 +67,7 @@ func (d *Doc) Data() interface{} {
 
 // Copy returns a duplicated copy of the internal data object.
 func (d *Doc) Copy() *Doc {
-	return new(Doc).Decode(d.Encode())
+	return Consume(dupe.Duplicate(d.data))
 }
 
 // Encode encodes the data object to a byte slice.
diff --git a/util/dupe/dupe.go b/util/dupe/dupe.go
new file mode 100644
index 00000000..ab5f39c4
--- /dev/null
+++ b/util/dupe/dupe.go
@@ -0,0 +1,62 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dupe
+
+type Copyable interface {
+	Copy() interface{}
+}
+
+type Cloneable interface {
+	Clone() interface{}
+}
+
+func Duplicate(v interface{}) interface{} {
+
+	switch x := v.(type) {
+	case map[string]interface{}:
+		out := make(map[string]interface{}, len(x))
+		for k, v := range x {
+			switch y := v.(type) {
+			case map[string]interface{}:
+				out[k] = Duplicate(y)
+			case []interface{}:
+				out[k] = Duplicate(y)
+			default:
+				out[k] = y
+			}
+		}
+		return out
+	case []interface{}:
+		out := make([]interface{}, len(x))
+		for k, v := range x {
+			switch y := v.(type) {
+			case map[string]interface{}:
+				out[k] = Duplicate(y)
+			case []interface{}:
+				out[k] = Duplicate(y)
+			default:
+				out[k] = y
+			}
+		}
+		return out
+	case Cloneable:
+		return x.Clone()
+	case Copyable:
+		return x.Copy()
+	default:
+		return x
+	}
+
+}