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fields.go
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fields.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 gogoproto
import (
"fmt"
"reflect"
"regexp"
"strings"
pbtypes "github.com/gogo/protobuf/types"
)
var nameTagRegex *regexp.Regexp
func init() {
nameTagRegex = regexp.MustCompile("name\\=[a-zA-Z_0-9]+")
}
// GoFieldsPaths converts protobuf FieldMask paths to Go fields paths.
//
// This implementation does not support separation by ",", but only paths separated by ".".
func GoFieldsPaths(pb *pbtypes.FieldMask, v interface{}) []string {
var newFields []string
if pb == nil || len(pb.Paths) == 0 {
return newFields
}
goFields := goFieldsFromProtoMasks(reflect.ValueOf(v))
for _, field := range pb.Paths {
goName, ok := goFields[field]
if ok {
newFields = append(newFields, goName)
} else {
newFields = append(newFields, field)
}
}
return newFields
}
func goFieldsFromProtoMasks(v reflect.Value) map[string]string {
if !v.IsValid() {
return nil
}
fields := make(map[string]string)
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return fields
}
for i := 0; i < v.NumField(); i++ {
tag := v.Type().Field(i).Tag.Get("protobuf")
if tag == "" {
continue
}
protoName := strings.TrimPrefix(nameTagRegex.FindString(tag), "name=")
if protoName == "" {
continue
}
goName := v.Type().Field(i).Name
fields[protoName] = goName
subFields := goFieldsFromProtoMasks(v.Field(i))
if len(subFields) == 0 {
continue
}
for k, v := range subFields {
fields[fmt.Sprintf("%s.%s", protoName, k)] = fmt.Sprintf("%s%s%s", goName, ".", v)
}
}
return fields
}