mirror of https://github.com/k3s-io/k3s
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
/*
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Copyright 2015 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package conversion
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import (
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"bytes"
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"encoding/gob"
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"reflect"
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"sync"
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)
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// pool is a pool of copiers
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var pool = sync.Pool{
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New: func() interface{} { return newGobCopier() },
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}
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// DeepCopy makes a deep copy of source or returns an error.
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func DeepCopy(source interface{}) (interface{}, error) {
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v := reflect.New(reflect.TypeOf(source))
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c := pool.Get().(gobCopier)
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defer pool.Put(c)
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if err := c.CopyInto(v.Interface(), source); err != nil {
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return nil, err
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}
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return v.Elem().Interface(), nil
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}
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// gobCopier provides a copy mechanism for objects using Gob.
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// This object is not safe for multiple threads because buffer
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// is shared.
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type gobCopier struct {
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enc *gob.Encoder
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dec *gob.Decoder
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}
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func newGobCopier() gobCopier {
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buf := &bytes.Buffer{}
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return gobCopier{
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enc: gob.NewEncoder(buf),
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dec: gob.NewDecoder(buf),
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}
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}
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func (c *gobCopier) CopyInto(dst, src interface{}) error {
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if err := c.enc.Encode(src); err != nil {
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return err
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}
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if err := c.dec.Decode(dst); err != nil {
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return err
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}
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return nil
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}
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