/
utils.go
79 lines (74 loc) · 2.68 KB
/
utils.go
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package flag_types
import (
"reflect"
"github.com/iancoleman/strcase"
"google.golang.org/protobuf/proto"
preflect "google.golang.org/protobuf/reflect/protoreflect"
)
func stripPathToLast(defaults []interface{}, fds []preflect.FieldDescriptor) ([]interface{}, []preflect.FieldDescriptor) {
if len(fds) < 2 {
return nil, nil
}
return defaults[:len(defaults)-1], fds[:len(fds)-1]
}
func getCurrentRawValue(msg proto.Message, fdPath []preflect.FieldDescriptor) (interface{}, bool) {
currentMsg := msg.ProtoReflect()
for i, fd := range fdPath {
fieldValue := currentMsg.Get(fd)
if !fieldValue.IsValid() {
return nil, false
}
if i == len(fdPath)-1 {
if fd.IsList() || fd.IsMap() {
refMsgType := reflect.ValueOf(currentMsg.Interface())
if refMsgType.IsZero() {
return nil, false
}
return reflect.ValueOf(currentMsg.Interface()).Elem().
FieldByName(strcase.ToCamel(string(fd.Name()))).Interface(), true
}
if fd.ContainingOneof() != nil {
ooFieldValue := reflect.ValueOf(currentMsg.Interface()).Elem().FieldByName(strcase.ToCamel(string(fd.ContainingOneof().Name())))
if !ooFieldValue.IsValid() {
return nil, false
}
underlyingValue := reflect.ValueOf(ooFieldValue.Interface())
rfieldValue := underlyingValue.Elem().FieldByName(strcase.ToCamel(string(fd.Name())))
if rfieldValue.IsZero() || !rfieldValue.IsValid() {
// for oneof, it can be field name with "_" as suffix.
rfieldValue = underlyingValue.Elem().FieldByName(strcase.ToCamel(string(fd.Name())) + "_")
if rfieldValue.IsZero() || !rfieldValue.IsValid() {
return nil, false
}
}
return rfieldValue.Interface(), true
}
rMsg := reflect.ValueOf(currentMsg.Interface())
if !rMsg.IsValid() || rMsg.IsZero() || !rMsg.Elem().IsValid() || rMsg.Elem().IsZero() {
return nil, false
}
rfieldValue := rMsg.Elem().FieldByName(strcase.ToCamel(string(fd.Name())))
if rfieldValue.IsZero() || !rfieldValue.IsValid() {
return nil, false
}
return rfieldValue.Interface(), true
}
currentMsg = fieldValue.Message()
}
return nil, false
}
func getFieldHolderAndEnsurePath(msg proto.Message, defaults []interface{}, fds []preflect.FieldDescriptor) preflect.Message {
currentMsg := msg.ProtoReflect()
for i := 0; i < len(fds); i++ {
fieldValue := currentMsg.Get(fds[i])
if !fieldValue.IsValid() || !fieldValue.Message().IsValid() {
msgValue := reflect.New(reflect.TypeOf(defaults[i]).Elem()).Interface().(proto.Message)
protoMsgValue := preflect.ValueOfMessage(msgValue.ProtoReflect())
currentMsg.Set(fds[i], protoMsgValue)
currentMsg = protoMsgValue.Message()
} else {
currentMsg = fieldValue.Message()
}
}
return currentMsg
}