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proto_utils.go
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proto_utils.go
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package utils
import (
"fmt"
"reflect"
"strings"
"github.com/iancoleman/strcase"
"google.golang.org/protobuf/proto"
preflect "google.golang.org/protobuf/reflect/protoreflect"
)
func GetValueFromProtoPath(msg proto.Message, rawPath string) (interface{}, bool) {
descriptor := msg.ProtoReflect().Descriptor()
pathItems := strings.Split(rawPath, ".")
lastMsgItem := msg
for i, item := range pathItems {
fd := descriptor.Fields().ByName(preflect.Name(strcase.ToSnake(item)))
if fd == nil {
panic(fmt.Sprintf("Field path %s not found in message %s", rawPath, descriptor.Name()))
}
fieldValue := lastMsgItem.ProtoReflect().Get(fd)
if !fieldValue.IsValid() {
return nil, false
}
if i == len(pathItems)-1 {
if fd.IsList() || fd.IsMap() {
refMsgType := reflect.ValueOf(lastMsgItem.ProtoReflect().Interface())
if refMsgType.IsZero() {
return nil, false
}
return refMsgType.Elem().FieldByName(strcase.ToCamel(string(fd.Name()))).Interface(), true
}
if fd.ContainingOneof() != nil {
ooFieldValue := reflect.ValueOf(lastMsgItem.ProtoReflect().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
} else {
rMsg := reflect.ValueOf(lastMsgItem.ProtoReflect().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
}
} else {
descriptor = fieldValue.Message().Descriptor()
lastMsgItem = fieldValue.Message().Interface()
}
}
return nil, false
}
func SetFieldPathValueToProtoMsg(target proto.Message, rawPath string, v any) {
descriptor := target.ProtoReflect().Descriptor()
pathItems := strings.Split(rawPath, ".")
lastMsgItem := target
for i, item := range pathItems {
fd := descriptor.Fields().ByName(preflect.Name(strcase.ToSnake(item)))
if fd == nil {
panic(fmt.Sprintf("Field path %s not found in message %s", rawPath, descriptor.Name()))
}
if i == len(pathItems)-1 {
SetFieldValueToProtoMsg(lastMsgItem, fd, v)
} else {
fieldValue := lastMsgItem.ProtoReflect().Get(fd)
if !fieldValue.IsValid() || !fieldValue.Message().IsValid() {
var fieldValueType reflect.Type
if fd.ContainingOneof() == nil {
refStructField, _ := reflect.TypeOf(lastMsgItem).Elem().FieldByName(strcase.ToCamel(item))
fieldValueType = refStructField.Type
} else {
refStructField, _ := GetFieldTypeForOneOf(lastMsgItem, fd)
fieldValueType = refStructField.Type
}
nextNested := reflect.New(fieldValueType.Elem()).Interface().(proto.Message)
lastMsgItem.ProtoReflect().Set(fd, preflect.ValueOfMessage(nextNested.ProtoReflect()))
lastMsgItem = nextNested
} else {
lastMsgItem = fieldValue.Message().Interface()
}
descriptor = lastMsgItem.ProtoReflect().Descriptor()
}
}
}
func SetFieldValueToProtoMsg(target proto.Message, fieldDesc preflect.FieldDescriptor, v any) {
if fieldDesc.IsList() {
rListValue := reflect.ValueOf(v)
listContent := target.ProtoReflect().NewField(fieldDesc).List()
for i := 0; i < rListValue.Len(); i++ {
value := rListValue.Index(i).Interface()
var preflectItemValue preflect.Value
if asProtoMsg, ok := value.(proto.Message); ok {
preflectItemValue = preflect.ValueOfMessage(asProtoMsg.ProtoReflect())
} else if asEnum, ok := value.(preflect.Enum); ok {
preflectItemValue = preflect.ValueOfEnum(asEnum.Number())
} else {
preflectItemValue = preflect.ValueOf(value)
}
listContent.Append(preflectItemValue)
}
target.ProtoReflect().Set(fieldDesc, preflect.ValueOfList(listContent))
} else if fieldDesc.IsMap() {
rMapValue := reflect.ValueOf(v)
objReflect := target.ProtoReflect()
mapContent := objReflect.NewField(fieldDesc).Map()
for _, key := range rMapValue.MapKeys() {
value := rMapValue.MapIndex(key).Interface()
var preflectItemValue preflect.Value
if asProtoMsg, ok := value.(proto.Message); ok {
preflectItemValue = preflect.ValueOfMessage(asProtoMsg.ProtoReflect())
} else if asEnum, ok := value.(preflect.Enum); ok {
preflectItemValue = preflect.ValueOfEnum(asEnum.Number())
} else {
preflectItemValue = preflect.ValueOf(value)
}
mapContent.Set(preflect.ValueOf(key.Interface()).MapKey(), preflectItemValue)
}
objReflect.Set(fieldDesc, preflect.ValueOfMap(mapContent))
} else {
if asProtoMsg, ok := v.(proto.Message); ok {
target.ProtoReflect().Set(fieldDesc, preflect.ValueOfMessage(asProtoMsg.ProtoReflect()))
} else if asEnum, ok := v.(preflect.Enum); ok {
target.ProtoReflect().Set(fieldDesc, preflect.ValueOfEnum(asEnum.Number()))
} else {
target.ProtoReflect().Set(fieldDesc, preflect.ValueOf(v))
}
}
}