[VOL-4291] OfAgent changes for gRPC migration
Change-Id: I8da1db6df49d478ef24ec8f9bd719e9692f48a7f
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go b/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go
new file mode 100644
index 0000000..08d3517
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go
@@ -0,0 +1,223 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+ "sync"
+ "sync/atomic"
+
+ "google.golang.org/protobuf/encoding/protowire"
+ "google.golang.org/protobuf/internal/errors"
+ pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type extensionFieldInfo struct {
+ wiretag uint64
+ tagsize int
+ unmarshalNeedsValue bool
+ funcs valueCoderFuncs
+ validation validationInfo
+}
+
+var legacyExtensionFieldInfoCache sync.Map // map[protoreflect.ExtensionType]*extensionFieldInfo
+
+func getExtensionFieldInfo(xt pref.ExtensionType) *extensionFieldInfo {
+ if xi, ok := xt.(*ExtensionInfo); ok {
+ xi.lazyInit()
+ return xi.info
+ }
+ return legacyLoadExtensionFieldInfo(xt)
+}
+
+// legacyLoadExtensionFieldInfo dynamically loads a *ExtensionInfo for xt.
+func legacyLoadExtensionFieldInfo(xt pref.ExtensionType) *extensionFieldInfo {
+ if xi, ok := legacyExtensionFieldInfoCache.Load(xt); ok {
+ return xi.(*extensionFieldInfo)
+ }
+ e := makeExtensionFieldInfo(xt.TypeDescriptor())
+ if e, ok := legacyMessageTypeCache.LoadOrStore(xt, e); ok {
+ return e.(*extensionFieldInfo)
+ }
+ return e
+}
+
+func makeExtensionFieldInfo(xd pref.ExtensionDescriptor) *extensionFieldInfo {
+ var wiretag uint64
+ if !xd.IsPacked() {
+ wiretag = protowire.EncodeTag(xd.Number(), wireTypes[xd.Kind()])
+ } else {
+ wiretag = protowire.EncodeTag(xd.Number(), protowire.BytesType)
+ }
+ e := &extensionFieldInfo{
+ wiretag: wiretag,
+ tagsize: protowire.SizeVarint(wiretag),
+ funcs: encoderFuncsForValue(xd),
+ }
+ // Does the unmarshal function need a value passed to it?
+ // This is true for composite types, where we pass in a message, list, or map to fill in,
+ // and for enums, where we pass in a prototype value to specify the concrete enum type.
+ switch xd.Kind() {
+ case pref.MessageKind, pref.GroupKind, pref.EnumKind:
+ e.unmarshalNeedsValue = true
+ default:
+ if xd.Cardinality() == pref.Repeated {
+ e.unmarshalNeedsValue = true
+ }
+ }
+ return e
+}
+
+type lazyExtensionValue struct {
+ atomicOnce uint32 // atomically set if value is valid
+ mu sync.Mutex
+ xi *extensionFieldInfo
+ value pref.Value
+ b []byte
+ fn func() pref.Value
+}
+
+type ExtensionField struct {
+ typ pref.ExtensionType
+
+ // value is either the value of GetValue,
+ // or a *lazyExtensionValue that then returns the value of GetValue.
+ value pref.Value
+ lazy *lazyExtensionValue
+}
+
+func (f *ExtensionField) appendLazyBytes(xt pref.ExtensionType, xi *extensionFieldInfo, num protowire.Number, wtyp protowire.Type, b []byte) {
+ if f.lazy == nil {
+ f.lazy = &lazyExtensionValue{xi: xi}
+ }
+ f.typ = xt
+ f.lazy.xi = xi
+ f.lazy.b = protowire.AppendTag(f.lazy.b, num, wtyp)
+ f.lazy.b = append(f.lazy.b, b...)
+}
+
+func (f *ExtensionField) canLazy(xt pref.ExtensionType) bool {
+ if f.typ == nil {
+ return true
+ }
+ if f.typ == xt && f.lazy != nil && atomic.LoadUint32(&f.lazy.atomicOnce) == 0 {
+ return true
+ }
+ return false
+}
+
+func (f *ExtensionField) lazyInit() {
+ f.lazy.mu.Lock()
+ defer f.lazy.mu.Unlock()
+ if atomic.LoadUint32(&f.lazy.atomicOnce) == 1 {
+ return
+ }
+ if f.lazy.xi != nil {
+ b := f.lazy.b
+ val := f.typ.New()
+ for len(b) > 0 {
+ var tag uint64
+ if b[0] < 0x80 {
+ tag = uint64(b[0])
+ b = b[1:]
+ } else if len(b) >= 2 && b[1] < 128 {
+ tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
+ b = b[2:]
+ } else {
+ var n int
+ tag, n = protowire.ConsumeVarint(b)
+ if n < 0 {
+ panic(errors.New("bad tag in lazy extension decoding"))
+ }
+ b = b[n:]
+ }
+ num := protowire.Number(tag >> 3)
+ wtyp := protowire.Type(tag & 7)
+ var out unmarshalOutput
+ var err error
+ val, out, err = f.lazy.xi.funcs.unmarshal(b, val, num, wtyp, lazyUnmarshalOptions)
+ if err != nil {
+ panic(errors.New("decode failure in lazy extension decoding: %v", err))
+ }
+ b = b[out.n:]
+ }
+ f.lazy.value = val
+ } else {
+ f.lazy.value = f.lazy.fn()
+ }
+ f.lazy.xi = nil
+ f.lazy.fn = nil
+ f.lazy.b = nil
+ atomic.StoreUint32(&f.lazy.atomicOnce, 1)
+}
+
+// Set sets the type and value of the extension field.
+// This must not be called concurrently.
+func (f *ExtensionField) Set(t pref.ExtensionType, v pref.Value) {
+ f.typ = t
+ f.value = v
+ f.lazy = nil
+}
+
+// SetLazy sets the type and a value that is to be lazily evaluated upon first use.
+// This must not be called concurrently.
+func (f *ExtensionField) SetLazy(t pref.ExtensionType, fn func() pref.Value) {
+ f.typ = t
+ f.lazy = &lazyExtensionValue{fn: fn}
+}
+
+// Value returns the value of the extension field.
+// This may be called concurrently.
+func (f *ExtensionField) Value() pref.Value {
+ if f.lazy != nil {
+ if atomic.LoadUint32(&f.lazy.atomicOnce) == 0 {
+ f.lazyInit()
+ }
+ return f.lazy.value
+ }
+ return f.value
+}
+
+// Type returns the type of the extension field.
+// This may be called concurrently.
+func (f ExtensionField) Type() pref.ExtensionType {
+ return f.typ
+}
+
+// IsSet returns whether the extension field is set.
+// This may be called concurrently.
+func (f ExtensionField) IsSet() bool {
+ return f.typ != nil
+}
+
+// IsLazy reports whether a field is lazily encoded.
+// It is exported for testing.
+func IsLazy(m pref.Message, fd pref.FieldDescriptor) bool {
+ var mi *MessageInfo
+ var p pointer
+ switch m := m.(type) {
+ case *messageState:
+ mi = m.messageInfo()
+ p = m.pointer()
+ case *messageReflectWrapper:
+ mi = m.messageInfo()
+ p = m.pointer()
+ default:
+ return false
+ }
+ xd, ok := fd.(pref.ExtensionTypeDescriptor)
+ if !ok {
+ return false
+ }
+ xt := xd.Type()
+ ext := mi.extensionMap(p)
+ if ext == nil {
+ return false
+ }
+ f, ok := (*ext)[int32(fd.Number())]
+ if !ok {
+ return false
+ }
+ return f.typ == xt && f.lazy != nil && atomic.LoadUint32(&f.lazy.atomicOnce) == 0
+}