mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-02 06:08:23 +08:00
Andrew LeFevre
35b837de87
"github.com/gogo/protobuf/proto.Clone" has multiple bugs that cause panics, so create a wrapper function that uses a thoroughly tested cloning function from "google.golang.org/protobuf".
38 lines
1.4 KiB
Go
38 lines
1.4 KiB
Go
/*
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Copyright 2023 Gravitational, Inc.
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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 utils
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import (
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"google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/protoadapt"
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)
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// CloneProtoMsg returns a deep copy of msg. Modifying the returned
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// protobuf message will not affect msg. If msg contains any empty
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// slices, the returned copy will have nil slices instead.
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func CloneProtoMsg[T protoadapt.MessageV1](msg T) T {
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// github.com/golang/protobuf/proto.Clone panics when trying to
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// copy a map[K]V where the type of V is a slice of anything
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// other than byte. See https://github.com/gogo/protobuf/issues/14
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msgV2 := protoadapt.MessageV2Of(msg)
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msgV2 = proto.Clone(msgV2)
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// this is safe as protoadapt.MessageV2Of will simply wrap the message
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// with a type that implements the protobuf v2 API, and
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// protoadapt.MessageV1Of will return the unwrapped message
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return protoadapt.MessageV1Of(msgV2).(T)
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}
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