503 lines
16 KiB
Go
503 lines
16 KiB
Go
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// Copyright 2018 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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"fmt"
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"reflect"
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"strings"
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"sync"
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"google.golang.org/protobuf/internal/descopts"
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ptag "google.golang.org/protobuf/internal/encoding/tag"
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"google.golang.org/protobuf/internal/errors"
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"google.golang.org/protobuf/internal/filedesc"
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"google.golang.org/protobuf/internal/strs"
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"google.golang.org/protobuf/reflect/protoreflect"
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pref "google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/runtime/protoiface"
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piface "google.golang.org/protobuf/runtime/protoiface"
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)
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// legacyWrapMessage wraps v as a protoreflect.Message,
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// where v must be a *struct kind and not implement the v2 API already.
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func legacyWrapMessage(v reflect.Value) pref.Message {
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typ := v.Type()
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if typ.Kind() != reflect.Ptr || typ.Elem().Kind() != reflect.Struct {
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return aberrantMessage{v: v}
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}
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mt := legacyLoadMessageInfo(typ, "")
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return mt.MessageOf(v.Interface())
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}
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var legacyMessageTypeCache sync.Map // map[reflect.Type]*MessageInfo
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// legacyLoadMessageInfo dynamically loads a *MessageInfo for t,
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// where t must be a *struct kind and not implement the v2 API already.
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// The provided name is used if it cannot be determined from the message.
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func legacyLoadMessageInfo(t reflect.Type, name pref.FullName) *MessageInfo {
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// Fast-path: check if a MessageInfo is cached for this concrete type.
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if mt, ok := legacyMessageTypeCache.Load(t); ok {
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return mt.(*MessageInfo)
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}
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// Slow-path: derive message descriptor and initialize MessageInfo.
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mi := &MessageInfo{
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Desc: legacyLoadMessageDesc(t, name),
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GoReflectType: t,
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}
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v := reflect.Zero(t).Interface()
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if _, ok := v.(legacyMarshaler); ok {
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mi.methods.Marshal = legacyMarshal
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// We have no way to tell whether the type's Marshal method
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// supports deterministic serialization or not, but this
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// preserves the v1 implementation's behavior of always
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// calling Marshal methods when present.
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mi.methods.Flags |= piface.SupportMarshalDeterministic
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}
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if _, ok := v.(legacyUnmarshaler); ok {
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mi.methods.Unmarshal = legacyUnmarshal
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}
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if _, ok := v.(legacyMerger); ok {
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mi.methods.Merge = legacyMerge
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}
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if mi, ok := legacyMessageTypeCache.LoadOrStore(t, mi); ok {
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return mi.(*MessageInfo)
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}
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return mi
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}
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var legacyMessageDescCache sync.Map // map[reflect.Type]protoreflect.MessageDescriptor
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// LegacyLoadMessageDesc returns an MessageDescriptor derived from the Go type,
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// which must be a *struct kind and not implement the v2 API already.
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//
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// This is exported for testing purposes.
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func LegacyLoadMessageDesc(t reflect.Type) pref.MessageDescriptor {
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return legacyLoadMessageDesc(t, "")
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}
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func legacyLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
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// Fast-path: check if a MessageDescriptor is cached for this concrete type.
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if mi, ok := legacyMessageDescCache.Load(t); ok {
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return mi.(pref.MessageDescriptor)
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}
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// Slow-path: initialize MessageDescriptor from the raw descriptor.
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mv := reflect.Zero(t).Interface()
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if _, ok := mv.(pref.ProtoMessage); ok {
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panic(fmt.Sprintf("%v already implements proto.Message", t))
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}
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mdV1, ok := mv.(messageV1)
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if !ok {
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return aberrantLoadMessageDesc(t, name)
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}
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// If this is a dynamic message type where there isn't a 1-1 mapping between
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// Go and protobuf types, calling the Descriptor method on the zero value of
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// the message type isn't likely to work. If it panics, swallow the panic and
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// continue as if the Descriptor method wasn't present.
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b, idxs := func() ([]byte, []int) {
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defer func() {
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recover()
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}()
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return mdV1.Descriptor()
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}()
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if b == nil {
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return aberrantLoadMessageDesc(t, name)
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}
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// If the Go type has no fields, then this might be a proto3 empty message
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// from before the size cache was added. If there are any fields, check to
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// see that at least one of them looks like something we generated.
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if nfield := t.Elem().NumField(); nfield > 0 {
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hasProtoField := false
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for i := 0; i < nfield; i++ {
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f := t.Elem().Field(i)
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if f.Tag.Get("protobuf") != "" || f.Tag.Get("protobuf_oneof") != "" || strings.HasPrefix(f.Name, "XXX_") {
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hasProtoField = true
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break
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}
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}
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if !hasProtoField {
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return aberrantLoadMessageDesc(t, name)
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}
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}
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md := legacyLoadFileDesc(b).Messages().Get(idxs[0])
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for _, i := range idxs[1:] {
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md = md.Messages().Get(i)
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}
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if name != "" && md.FullName() != name {
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panic(fmt.Sprintf("mismatching message name: got %v, want %v", md.FullName(), name))
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}
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if md, ok := legacyMessageDescCache.LoadOrStore(t, md); ok {
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return md.(protoreflect.MessageDescriptor)
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}
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return md
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}
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var (
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aberrantMessageDescLock sync.Mutex
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aberrantMessageDescCache map[reflect.Type]protoreflect.MessageDescriptor
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)
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// aberrantLoadMessageDesc returns an MessageDescriptor derived from the Go type,
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// which must not implement protoreflect.ProtoMessage or messageV1.
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//
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// This is a best-effort derivation of the message descriptor using the protobuf
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// tags on the struct fields.
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func aberrantLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
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aberrantMessageDescLock.Lock()
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defer aberrantMessageDescLock.Unlock()
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if aberrantMessageDescCache == nil {
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aberrantMessageDescCache = make(map[reflect.Type]protoreflect.MessageDescriptor)
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}
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return aberrantLoadMessageDescReentrant(t, name)
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}
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func aberrantLoadMessageDescReentrant(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
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// Fast-path: check if an MessageDescriptor is cached for this concrete type.
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if md, ok := aberrantMessageDescCache[t]; ok {
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return md
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}
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// Slow-path: construct a descriptor from the Go struct type (best-effort).
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// Cache the MessageDescriptor early on so that we can resolve internal
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// cyclic references.
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md := &filedesc.Message{L2: new(filedesc.MessageL2)}
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md.L0.FullName = aberrantDeriveMessageName(t, name)
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md.L0.ParentFile = filedesc.SurrogateProto2
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aberrantMessageDescCache[t] = md
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if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Struct {
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return md
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}
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// Try to determine if the message is using proto3 by checking scalars.
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for i := 0; i < t.Elem().NumField(); i++ {
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f := t.Elem().Field(i)
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if tag := f.Tag.Get("protobuf"); tag != "" {
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switch f.Type.Kind() {
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case reflect.Bool, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64, reflect.String:
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md.L0.ParentFile = filedesc.SurrogateProto3
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}
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for _, s := range strings.Split(tag, ",") {
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if s == "proto3" {
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md.L0.ParentFile = filedesc.SurrogateProto3
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}
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}
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}
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}
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// Obtain a list of oneof wrapper types.
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var oneofWrappers []reflect.Type
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for _, method := range []string{"XXX_OneofFuncs", "XXX_OneofWrappers"} {
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if fn, ok := t.MethodByName(method); ok {
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for _, v := range fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))}) {
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if vs, ok := v.Interface().([]interface{}); ok {
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for _, v := range vs {
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oneofWrappers = append(oneofWrappers, reflect.TypeOf(v))
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}
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}
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}
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}
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}
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// Obtain a list of the extension ranges.
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if fn, ok := t.MethodByName("ExtensionRangeArray"); ok {
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vs := fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))})[0]
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for i := 0; i < vs.Len(); i++ {
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v := vs.Index(i)
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md.L2.ExtensionRanges.List = append(md.L2.ExtensionRanges.List, [2]pref.FieldNumber{
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pref.FieldNumber(v.FieldByName("Start").Int()),
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pref.FieldNumber(v.FieldByName("End").Int() + 1),
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})
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md.L2.ExtensionRangeOptions = append(md.L2.ExtensionRangeOptions, nil)
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}
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}
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// Derive the message fields by inspecting the struct fields.
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for i := 0; i < t.Elem().NumField(); i++ {
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f := t.Elem().Field(i)
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if tag := f.Tag.Get("protobuf"); tag != "" {
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tagKey := f.Tag.Get("protobuf_key")
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tagVal := f.Tag.Get("protobuf_val")
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aberrantAppendField(md, f.Type, tag, tagKey, tagVal)
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}
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if tag := f.Tag.Get("protobuf_oneof"); tag != "" {
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n := len(md.L2.Oneofs.List)
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md.L2.Oneofs.List = append(md.L2.Oneofs.List, filedesc.Oneof{})
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od := &md.L2.Oneofs.List[n]
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od.L0.FullName = md.FullName().Append(pref.Name(tag))
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od.L0.ParentFile = md.L0.ParentFile
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od.L0.Parent = md
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od.L0.Index = n
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for _, t := range oneofWrappers {
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if t.Implements(f.Type) {
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f := t.Elem().Field(0)
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if tag := f.Tag.Get("protobuf"); tag != "" {
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aberrantAppendField(md, f.Type, tag, "", "")
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fd := &md.L2.Fields.List[len(md.L2.Fields.List)-1]
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fd.L1.ContainingOneof = od
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od.L1.Fields.List = append(od.L1.Fields.List, fd)
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}
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}
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}
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}
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}
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return md
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}
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func aberrantDeriveMessageName(t reflect.Type, name pref.FullName) pref.FullName {
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if name.IsValid() {
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return name
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}
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func() {
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defer func() { recover() }() // swallow possible nil panics
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if m, ok := reflect.Zero(t).Interface().(interface{ XXX_MessageName() string }); ok {
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name = pref.FullName(m.XXX_MessageName())
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}
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}()
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if name.IsValid() {
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return name
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}
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if t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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return AberrantDeriveFullName(t)
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}
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func aberrantAppendField(md *filedesc.Message, goType reflect.Type, tag, tagKey, tagVal string) {
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t := goType
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isOptional := t.Kind() == reflect.Ptr && t.Elem().Kind() != reflect.Struct
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isRepeated := t.Kind() == reflect.Slice && t.Elem().Kind() != reflect.Uint8
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if isOptional || isRepeated {
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t = t.Elem()
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}
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fd := ptag.Unmarshal(tag, t, placeholderEnumValues{}).(*filedesc.Field)
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// Append field descriptor to the message.
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n := len(md.L2.Fields.List)
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md.L2.Fields.List = append(md.L2.Fields.List, *fd)
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fd = &md.L2.Fields.List[n]
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fd.L0.FullName = md.FullName().Append(fd.Name())
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fd.L0.ParentFile = md.L0.ParentFile
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fd.L0.Parent = md
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fd.L0.Index = n
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if fd.L1.IsWeak || fd.L1.HasPacked {
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fd.L1.Options = func() pref.ProtoMessage {
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opts := descopts.Field.ProtoReflect().New()
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if fd.L1.IsWeak {
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opts.Set(opts.Descriptor().Fields().ByName("weak"), protoreflect.ValueOfBool(true))
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}
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if fd.L1.HasPacked {
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opts.Set(opts.Descriptor().Fields().ByName("packed"), protoreflect.ValueOfBool(fd.L1.IsPacked))
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}
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return opts.Interface()
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}
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}
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|
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|
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// Populate Enum and Message.
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if fd.Enum() == nil && fd.Kind() == pref.EnumKind {
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switch v := reflect.Zero(t).Interface().(type) {
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case pref.Enum:
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fd.L1.Enum = v.Descriptor()
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default:
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fd.L1.Enum = LegacyLoadEnumDesc(t)
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}
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}
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if fd.Message() == nil && (fd.Kind() == pref.MessageKind || fd.Kind() == pref.GroupKind) {
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switch v := reflect.Zero(t).Interface().(type) {
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case pref.ProtoMessage:
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fd.L1.Message = v.ProtoReflect().Descriptor()
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case messageV1:
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fd.L1.Message = LegacyLoadMessageDesc(t)
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default:
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if t.Kind() == reflect.Map {
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n := len(md.L1.Messages.List)
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md.L1.Messages.List = append(md.L1.Messages.List, filedesc.Message{L2: new(filedesc.MessageL2)})
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md2 := &md.L1.Messages.List[n]
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md2.L0.FullName = md.FullName().Append(pref.Name(strs.MapEntryName(string(fd.Name()))))
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md2.L0.ParentFile = md.L0.ParentFile
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md2.L0.Parent = md
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md2.L0.Index = n
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md2.L1.IsMapEntry = true
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md2.L2.Options = func() pref.ProtoMessage {
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opts := descopts.Message.ProtoReflect().New()
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opts.Set(opts.Descriptor().Fields().ByName("map_entry"), protoreflect.ValueOfBool(true))
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return opts.Interface()
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}
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aberrantAppendField(md2, t.Key(), tagKey, "", "")
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aberrantAppendField(md2, t.Elem(), tagVal, "", "")
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fd.L1.Message = md2
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break
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}
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fd.L1.Message = aberrantLoadMessageDescReentrant(t, "")
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}
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}
|
||
|
|
}
|
||
|
|
|
||
|
|
type placeholderEnumValues struct {
|
||
|
|
protoreflect.EnumValueDescriptors
|
||
|
|
}
|
||
|
|
|
||
|
|
func (placeholderEnumValues) ByNumber(n pref.EnumNumber) pref.EnumValueDescriptor {
|
||
|
|
return filedesc.PlaceholderEnumValue(pref.FullName(fmt.Sprintf("UNKNOWN_%d", n)))
|
||
|
|
}
|
||
|
|
|
||
|
|
// legacyMarshaler is the proto.Marshaler interface superseded by protoiface.Methoder.
|
||
|
|
type legacyMarshaler interface {
|
||
|
|
Marshal() ([]byte, error)
|
||
|
|
}
|
||
|
|
|
||
|
|
// legacyUnmarshaler is the proto.Unmarshaler interface superseded by protoiface.Methoder.
|
||
|
|
type legacyUnmarshaler interface {
|
||
|
|
Unmarshal([]byte) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// legacyMerger is the proto.Merger interface superseded by protoiface.Methoder.
|
||
|
|
type legacyMerger interface {
|
||
|
|
Merge(protoiface.MessageV1)
|
||
|
|
}
|
||
|
|
|
||
|
|
var legacyProtoMethods = &piface.Methods{
|
||
|
|
Marshal: legacyMarshal,
|
||
|
|
Unmarshal: legacyUnmarshal,
|
||
|
|
Merge: legacyMerge,
|
||
|
|
|
||
|
|
// We have no way to tell whether the type's Marshal method
|
||
|
|
// supports deterministic serialization or not, but this
|
||
|
|
// preserves the v1 implementation's behavior of always
|
||
|
|
// calling Marshal methods when present.
|
||
|
|
Flags: piface.SupportMarshalDeterministic,
|
||
|
|
}
|
||
|
|
|
||
|
|
func legacyMarshal(in piface.MarshalInput) (piface.MarshalOutput, error) {
|
||
|
|
v := in.Message.(unwrapper).protoUnwrap()
|
||
|
|
marshaler, ok := v.(legacyMarshaler)
|
||
|
|
if !ok {
|
||
|
|
return piface.MarshalOutput{}, errors.New("%T does not implement Marshal", v)
|
||
|
|
}
|
||
|
|
out, err := marshaler.Marshal()
|
||
|
|
if in.Buf != nil {
|
||
|
|
out = append(in.Buf, out...)
|
||
|
|
}
|
||
|
|
return piface.MarshalOutput{
|
||
|
|
Buf: out,
|
||
|
|
}, err
|
||
|
|
}
|
||
|
|
|
||
|
|
func legacyUnmarshal(in piface.UnmarshalInput) (piface.UnmarshalOutput, error) {
|
||
|
|
v := in.Message.(unwrapper).protoUnwrap()
|
||
|
|
unmarshaler, ok := v.(legacyUnmarshaler)
|
||
|
|
if !ok {
|
||
|
|
return piface.UnmarshalOutput{}, errors.New("%T does not implement Marshal", v)
|
||
|
|
}
|
||
|
|
return piface.UnmarshalOutput{}, unmarshaler.Unmarshal(in.Buf)
|
||
|
|
}
|
||
|
|
|
||
|
|
func legacyMerge(in piface.MergeInput) piface.MergeOutput {
|
||
|
|
dstv := in.Destination.(unwrapper).protoUnwrap()
|
||
|
|
merger, ok := dstv.(legacyMerger)
|
||
|
|
if !ok {
|
||
|
|
return piface.MergeOutput{}
|
||
|
|
}
|
||
|
|
merger.Merge(Export{}.ProtoMessageV1Of(in.Source))
|
||
|
|
return piface.MergeOutput{Flags: piface.MergeComplete}
|
||
|
|
}
|
||
|
|
|
||
|
|
// aberrantMessageType implements MessageType for all types other than pointer-to-struct.
|
||
|
|
type aberrantMessageType struct {
|
||
|
|
t reflect.Type
|
||
|
|
}
|
||
|
|
|
||
|
|
func (mt aberrantMessageType) New() pref.Message {
|
||
|
|
return aberrantMessage{reflect.Zero(mt.t)}
|
||
|
|
}
|
||
|
|
func (mt aberrantMessageType) Zero() pref.Message {
|
||
|
|
return aberrantMessage{reflect.Zero(mt.t)}
|
||
|
|
}
|
||
|
|
func (mt aberrantMessageType) GoType() reflect.Type {
|
||
|
|
return mt.t
|
||
|
|
}
|
||
|
|
func (mt aberrantMessageType) Descriptor() pref.MessageDescriptor {
|
||
|
|
return LegacyLoadMessageDesc(mt.t)
|
||
|
|
}
|
||
|
|
|
||
|
|
// aberrantMessage implements Message for all types other than pointer-to-struct.
|
||
|
|
//
|
||
|
|
// When the underlying type implements legacyMarshaler or legacyUnmarshaler,
|
||
|
|
// the aberrant Message can be marshaled or unmarshaled. Otherwise, there is
|
||
|
|
// not much that can be done with values of this type.
|
||
|
|
type aberrantMessage struct {
|
||
|
|
v reflect.Value
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m aberrantMessage) ProtoReflect() pref.Message {
|
||
|
|
return m
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m aberrantMessage) Descriptor() pref.MessageDescriptor {
|
||
|
|
return LegacyLoadMessageDesc(m.v.Type())
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Type() pref.MessageType {
|
||
|
|
return aberrantMessageType{m.v.Type()}
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) New() pref.Message {
|
||
|
|
return aberrantMessage{reflect.Zero(m.v.Type())}
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Interface() pref.ProtoMessage {
|
||
|
|
return m
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Range(f func(pref.FieldDescriptor, pref.Value) bool) {
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Has(pref.FieldDescriptor) bool {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Clear(pref.FieldDescriptor) {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Get(pref.FieldDescriptor) pref.Value {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Set(pref.FieldDescriptor, pref.Value) {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) Mutable(pref.FieldDescriptor) pref.Value {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) NewField(pref.FieldDescriptor) pref.Value {
|
||
|
|
panic("invalid field descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) WhichOneof(pref.OneofDescriptor) pref.FieldDescriptor {
|
||
|
|
panic("invalid oneof descriptor")
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) GetUnknown() pref.RawFields {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) SetUnknown(pref.RawFields) {
|
||
|
|
// SetUnknown discards its input on messages which don't support unknown field storage.
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) IsValid() bool {
|
||
|
|
// An invalid message is a read-only, empty message. Since we don't know anything
|
||
|
|
// about the alleged contents of this message, we can't say with confidence that
|
||
|
|
// it is invalid in this sense. Therefore, report it as valid.
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) ProtoMethods() *piface.Methods {
|
||
|
|
return legacyProtoMethods
|
||
|
|
}
|
||
|
|
func (m aberrantMessage) protoUnwrap() interface{} {
|
||
|
|
return m.v.Interface()
|
||
|
|
}
|