mirror of
https://github.com/ceph/ceph-csi.git
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157 lines
4.5 KiB
Go
157 lines
4.5 KiB
Go
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// 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 impl
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import (
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"reflect"
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"sync"
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"sync/atomic"
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pref "google.golang.org/protobuf/reflect/protoreflect"
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piface "google.golang.org/protobuf/runtime/protoiface"
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)
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// ExtensionInfo implements ExtensionType.
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//
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// This type contains a number of exported fields for legacy compatibility.
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// The only non-deprecated use of this type is through the methods of the
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// ExtensionType interface.
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type ExtensionInfo struct {
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// An ExtensionInfo may exist in several stages of initialization.
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//
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// extensionInfoUninitialized: Some or all of the legacy exported
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// fields may be set, but none of the unexported fields have been
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// initialized. This is the starting state for an ExtensionInfo
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// in legacy generated code.
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//
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// extensionInfoDescInit: The desc field is set, but other unexported fields
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// may not be initialized. Legacy exported fields may or may not be set.
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// This is the starting state for an ExtensionInfo in newly generated code.
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//
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// extensionInfoFullInit: The ExtensionInfo is fully initialized.
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// This state is only entered after lazy initialization is complete.
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init uint32
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mu sync.Mutex
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goType reflect.Type
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desc extensionTypeDescriptor
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conv Converter
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info *extensionFieldInfo // for fast-path method implementations
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// ExtendedType is a typed nil-pointer to the parent message type that
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// is being extended. It is possible for this to be unpopulated in v2
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// since the message may no longer implement the MessageV1 interface.
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//
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// Deprecated: Use the ExtendedType method instead.
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ExtendedType piface.MessageV1
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// ExtensionType is the zero value of the extension type.
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//
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// For historical reasons, reflect.TypeOf(ExtensionType) and the
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// type returned by InterfaceOf may not be identical.
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//
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// Deprecated: Use InterfaceOf(xt.Zero()) instead.
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ExtensionType interface{}
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// Field is the field number of the extension.
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//
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// Deprecated: Use the Descriptor().Number method instead.
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Field int32
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// Name is the fully qualified name of extension.
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//
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// Deprecated: Use the Descriptor().FullName method instead.
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Name string
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// Tag is the protobuf struct tag used in the v1 API.
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//
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// Deprecated: Do not use.
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Tag string
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// Filename is the proto filename in which the extension is defined.
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//
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// Deprecated: Use Descriptor().ParentFile().Path() instead.
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Filename string
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}
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// Stages of initialization: See the ExtensionInfo.init field.
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const (
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extensionInfoUninitialized = 0
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extensionInfoDescInit = 1
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extensionInfoFullInit = 2
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)
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func InitExtensionInfo(xi *ExtensionInfo, xd pref.ExtensionDescriptor, goType reflect.Type) {
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xi.goType = goType
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xi.desc = extensionTypeDescriptor{xd, xi}
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xi.init = extensionInfoDescInit
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}
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func (xi *ExtensionInfo) New() pref.Value {
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return xi.lazyInit().New()
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}
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func (xi *ExtensionInfo) Zero() pref.Value {
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return xi.lazyInit().Zero()
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}
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func (xi *ExtensionInfo) ValueOf(v interface{}) pref.Value {
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return xi.lazyInit().PBValueOf(reflect.ValueOf(v))
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}
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func (xi *ExtensionInfo) InterfaceOf(v pref.Value) interface{} {
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return xi.lazyInit().GoValueOf(v).Interface()
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}
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func (xi *ExtensionInfo) IsValidValue(v pref.Value) bool {
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return xi.lazyInit().IsValidPB(v)
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}
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func (xi *ExtensionInfo) IsValidInterface(v interface{}) bool {
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return xi.lazyInit().IsValidGo(reflect.ValueOf(v))
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}
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func (xi *ExtensionInfo) TypeDescriptor() pref.ExtensionTypeDescriptor {
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if atomic.LoadUint32(&xi.init) < extensionInfoDescInit {
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xi.lazyInitSlow()
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}
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return &xi.desc
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}
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func (xi *ExtensionInfo) lazyInit() Converter {
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if atomic.LoadUint32(&xi.init) < extensionInfoFullInit {
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xi.lazyInitSlow()
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}
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return xi.conv
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}
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func (xi *ExtensionInfo) lazyInitSlow() {
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xi.mu.Lock()
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defer xi.mu.Unlock()
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if xi.init == extensionInfoFullInit {
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return
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}
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defer atomic.StoreUint32(&xi.init, extensionInfoFullInit)
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if xi.desc.ExtensionDescriptor == nil {
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xi.initFromLegacy()
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}
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if !xi.desc.ExtensionDescriptor.IsPlaceholder() {
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if xi.ExtensionType == nil {
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xi.initToLegacy()
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}
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xi.conv = NewConverter(xi.goType, xi.desc.ExtensionDescriptor)
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xi.info = makeExtensionFieldInfo(xi.desc.ExtensionDescriptor)
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xi.info.validation = newValidationInfo(xi.desc.ExtensionDescriptor, xi.goType)
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}
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}
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type extensionTypeDescriptor struct {
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pref.ExtensionDescriptor
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xi *ExtensionInfo
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}
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func (xtd *extensionTypeDescriptor) Type() pref.ExtensionType {
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return xtd.xi
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}
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func (xtd *extensionTypeDescriptor) Descriptor() pref.ExtensionDescriptor {
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return xtd.ExtensionDescriptor
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}
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