mirror of
https://github.com/protocolbuffers/protobuf-go.git
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8cfc14f022
To assist users in migrating from github.com/golang/protobuf to google.golang.org/protobuf, make it such that functiionality like proto.Marshal doesn't panic on nil interfaces. Similar to how the new implementation treats a typed nil message as an empty message, we treat a nil interface as being equivalent to an "untyped" empty message. Change-Id: Ic037f386f855b122f732b34d370e524b7c0d76f1 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/228837 Reviewed-by: Damien Neil <dneil@google.com>
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package proto
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import (
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"google.golang.org/protobuf/internal/errors"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/runtime/protoiface"
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)
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// CheckInitialized returns an error if any required fields in m are not set.
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func CheckInitialized(m Message) error {
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// Treat a nil message interface as an "untyped" empty message,
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// which we assume to have no required fields.
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if m == nil {
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return nil
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}
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return checkInitialized(m.ProtoReflect())
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}
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// CheckInitialized returns an error if any required fields in m are not set.
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func checkInitialized(m protoreflect.Message) error {
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if methods := protoMethods(m); methods != nil && methods.CheckInitialized != nil {
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_, err := methods.CheckInitialized(protoiface.CheckInitializedInput{
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Message: m,
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})
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return err
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}
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return checkInitializedSlow(m)
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}
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func checkInitializedSlow(m protoreflect.Message) error {
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md := m.Descriptor()
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fds := md.Fields()
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for i, nums := 0, md.RequiredNumbers(); i < nums.Len(); i++ {
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fd := fds.ByNumber(nums.Get(i))
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if !m.Has(fd) {
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return errors.RequiredNotSet(string(fd.FullName()))
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}
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}
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var err error
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m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
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switch {
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case fd.IsList():
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if fd.Message() == nil {
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return true
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}
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for i, list := 0, v.List(); i < list.Len() && err == nil; i++ {
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err = checkInitialized(list.Get(i).Message())
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}
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case fd.IsMap():
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if fd.MapValue().Message() == nil {
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return true
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}
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v.Map().Range(func(key protoreflect.MapKey, v protoreflect.Value) bool {
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err = checkInitialized(v.Message())
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return err == nil
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})
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default:
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if fd.Message() == nil {
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return true
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}
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err = checkInitialized(v.Message())
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}
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return err == nil
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})
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return err
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}
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