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copy.go
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copy.go
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// Copyright 2022 Google LLC
//
// 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 proto implements utilities for managing GCP resource protos
// (e.g., copy, equal, merge).
//
// Most of the implementations in this package are based on the implementations
// in the "official" proto package, i.e., "google.golang.org/protobuf/proto",
// with small modifications to serve Service Weaver GCP updating needs.
package proto
import (
"errors"
"fmt"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
// Copy copies all populated message fields from src into dst, overwriting any
// existing values in dst. Fields in skipFields aren't copied, even if they are
// populated.
// Returns the list of all fields in dst that were modified during the copy,
// or nil otherwise.
func Copy(dst, src proto.Message, skipFields []string) ([]string, error) {
if src == nil {
return nil, nil
}
if dst == nil {
return nil, errors.New("nil dst")
}
d := dst.ProtoReflect()
s := src.ProtoReflect()
if !s.IsValid() {
return nil, errors.New("invalid src message for copy")
}
if !d.IsValid() {
return nil, errors.New("invalid dst message for copy")
}
if s.Descriptor() != d.Descriptor() {
return nil, fmt.Errorf("incompatible descriptors %q and %q for copy",
s.Descriptor().FullName(), d.Descriptor().FullName())
}
skip := toSet(skipFields)
var modified []string
s.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
if _, ok := skip[fd.TextName()]; ok {
return true
}
if equalField(d.Get(fd), v, fd) {
return true
}
d.Set(fd, v)
modified = append(modified, fd.TextName())
return true
})
return modified, nil
}
func toSet(vals []string) map[string]bool {
set := make(map[string]bool, len(vals))
for _, val := range vals {
set[val] = true
}
return set
}