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resolver.go
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resolver.go
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package builder
import (
"fmt"
"reflect"
"strings"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/descriptorpb"
"github.com/jhump/protoreflect/desc"
"github.com/jhump/protoreflect/desc/internal"
"github.com/jhump/protoreflect/dynamic"
)
type dependencies struct {
descs map[*desc.FileDescriptor]struct{}
res protoregistry.Types
}
func newDependencies() *dependencies {
return &dependencies{
descs: map[*desc.FileDescriptor]struct{}{},
}
}
func (d *dependencies) add(fd *desc.FileDescriptor) {
if _, ok := d.descs[fd]; ok {
// already added
return
}
d.descs[fd] = struct{}{}
internal.RegisterExtensionsFromImportedFile(&d.res, fd.UnwrapFile())
}
// dependencyResolver is the work-horse for converting a tree of builders into a
// tree of descriptors. It scans a root (usually a file builder) and recursively
// resolves all dependencies (references to builders in other trees as well as
// references to other already-built descriptors). The result of resolution is a
// file descriptor (or an error).
type dependencyResolver struct {
resolvedRoots map[Builder]*desc.FileDescriptor
seen map[Builder]struct{}
opts BuilderOptions
}
func newResolver(opts BuilderOptions) *dependencyResolver {
return &dependencyResolver{
resolvedRoots: map[Builder]*desc.FileDescriptor{},
seen: map[Builder]struct{}{},
opts: opts,
}
}
func (r *dependencyResolver) resolveElement(b Builder, seen []Builder) (*desc.FileDescriptor, error) {
b = getRoot(b)
if fd, ok := r.resolvedRoots[b]; ok {
return fd, nil
}
for _, s := range seen {
if s == b {
names := make([]string, len(seen)+1)
for i, s := range seen {
names[i] = s.GetName()
}
names[len(seen)] = b.GetName()
return nil, fmt.Errorf("descriptors have cyclic dependency: %s", strings.Join(names, " -> "))
}
}
seen = append(seen, b)
var fd *desc.FileDescriptor
var err error
switch b := b.(type) {
case *FileBuilder:
fd, err = r.resolveFile(b, b, seen)
default:
fd, err = r.resolveSyntheticFile(b, seen)
}
if err != nil {
return nil, err
}
r.resolvedRoots[b] = fd
return fd, nil
}
func (r *dependencyResolver) resolveFile(fb *FileBuilder, root Builder, seen []Builder) (*desc.FileDescriptor, error) {
deps := newDependencies()
// add explicit imports first
for fd := range fb.explicitImports {
deps.add(fd)
}
for dep := range fb.explicitDeps {
if dep == fb {
// ignore erroneous self references
continue
}
fd, err := r.resolveElement(dep, seen)
if err != nil {
return nil, err
}
deps.add(fd)
}
// now accumulate implicit dependencies based on other types referenced
for _, mb := range fb.messages {
if err := r.resolveTypesInMessage(root, seen, deps, mb); err != nil {
return nil, err
}
}
for _, exb := range fb.extensions {
if err := r.resolveTypesInExtension(root, seen, deps, exb); err != nil {
return nil, err
}
}
for _, sb := range fb.services {
if err := r.resolveTypesInService(root, seen, deps, sb); err != nil {
return nil, err
}
}
// finally, resolve custom options (which may refer to deps already
// computed above)
if err := r.resolveTypesInFileOptions(root, deps, fb); err != nil {
return nil, err
}
depSlice := make([]*desc.FileDescriptor, 0, len(deps.descs))
depMap := make(map[string]*desc.FileDescriptor, len(deps.descs))
for dep := range deps.descs {
isDuplicate, err := isDuplicateDependency(dep, depMap)
if err != nil {
return nil, err
}
if !isDuplicate {
depSlice = append(depSlice, dep)
}
}
fp, err := fb.buildProto(depSlice)
if err != nil {
return nil, err
}
// make sure this file name doesn't collide with any of its dependencies
fileNames := map[string]struct{}{}
for _, d := range depSlice {
addFileNames(d, fileNames)
}
unique := makeUnique(fp.GetName(), fileNames)
if unique != fp.GetName() {
fp.Name = proto.String(unique)
}
return desc.CreateFileDescriptor(fp, depSlice...)
}
// isDuplicateDependency checks for duplicate descriptors
func isDuplicateDependency(dep *desc.FileDescriptor, depMap map[string]*desc.FileDescriptor) (bool, error) {
if _, exists := depMap[dep.GetName()]; !exists {
depMap[dep.GetName()] = dep
return false, nil
}
prevFDP := depMap[dep.GetName()].AsFileDescriptorProto()
depFDP := dep.AsFileDescriptorProto()
// temporarily reset Source Code Fields as builders does not have SourceCodeInfo
defer setSourceCodeInfo(prevFDP, nil)()
defer setSourceCodeInfo(depFDP, nil)()
if !proto.Equal(prevFDP, depFDP) {
return true, fmt.Errorf("multiple versions of descriptors found with same file name: %s", dep.GetName())
}
return true, nil
}
func setSourceCodeInfo(fdp *descriptorpb.FileDescriptorProto, info *descriptorpb.SourceCodeInfo) (reset func()) {
prevSourceCodeInfo := fdp.SourceCodeInfo
fdp.SourceCodeInfo = info
return func() { fdp.SourceCodeInfo = prevSourceCodeInfo }
}
func addFileNames(fd *desc.FileDescriptor, files map[string]struct{}) {
if _, ok := files[fd.GetName()]; ok {
// already added
return
}
files[fd.GetName()] = struct{}{}
for _, d := range fd.GetDependencies() {
addFileNames(d, files)
}
}
func (r *dependencyResolver) resolveSyntheticFile(b Builder, seen []Builder) (*desc.FileDescriptor, error) {
// find ancestor to temporarily attach to new file
curr := b
for curr.GetParent() != nil {
curr = curr.GetParent()
}
f := NewFile("")
switch curr := curr.(type) {
case *MessageBuilder:
f.messages = append(f.messages, curr)
case *EnumBuilder:
f.enums = append(f.enums, curr)
case *ServiceBuilder:
f.services = append(f.services, curr)
case *FieldBuilder:
if curr.IsExtension() {
f.extensions = append(f.extensions, curr)
} else {
panic("field must be added to message before calling Build()")
}
case *OneOfBuilder:
if _, ok := b.(*OneOfBuilder); ok {
panic("one-of must be added to message before calling Build()")
} else {
// b was a child of one-of which means it must have been a field
panic("field must be added to message before calling Build()")
}
case *MethodBuilder:
panic("method must be added to service before calling Build()")
case *EnumValueBuilder:
panic("enum value must be added to enum before calling Build()")
default:
panic(fmt.Sprintf("Unrecognized kind of builder: %T", b))
}
curr.setParent(f)
// don't forget to reset when done
defer func() {
curr.setParent(nil)
}()
return r.resolveFile(f, b, seen)
}
func (r *dependencyResolver) resolveTypesInMessage(root Builder, seen []Builder, deps *dependencies, mb *MessageBuilder) error {
for _, b := range mb.fieldsAndOneOfs {
if flb, ok := b.(*FieldBuilder); ok {
if err := r.resolveTypesInField(root, seen, deps, flb); err != nil {
return err
}
} else {
oob := b.(*OneOfBuilder)
for _, flb := range oob.choices {
if err := r.resolveTypesInField(root, seen, deps, flb); err != nil {
return err
}
}
}
}
for _, nmb := range mb.nestedMessages {
if err := r.resolveTypesInMessage(root, seen, deps, nmb); err != nil {
return err
}
}
for _, exb := range mb.nestedExtensions {
if err := r.resolveTypesInExtension(root, seen, deps, exb); err != nil {
return err
}
}
return nil
}
func (r *dependencyResolver) resolveTypesInExtension(root Builder, seen []Builder, deps *dependencies, exb *FieldBuilder) error {
if err := r.resolveTypesInField(root, seen, deps, exb); err != nil {
return err
}
if exb.foreignExtendee != nil {
deps.add(exb.foreignExtendee.GetFile())
} else if err := r.resolveType(root, seen, exb.localExtendee, deps); err != nil {
return err
}
return nil
}
func (r *dependencyResolver) resolveTypesInService(root Builder, seen []Builder, deps *dependencies, sb *ServiceBuilder) error {
for _, mtb := range sb.methods {
if err := r.resolveRpcType(root, seen, mtb.ReqType, deps); err != nil {
return err
}
if err := r.resolveRpcType(root, seen, mtb.RespType, deps); err != nil {
return err
}
}
return nil
}
func (r *dependencyResolver) resolveRpcType(root Builder, seen []Builder, t *RpcType, deps *dependencies) error {
if t.foreignType != nil {
deps.add(t.foreignType.GetFile())
} else {
return r.resolveType(root, seen, t.localType, deps)
}
return nil
}
func (r *dependencyResolver) resolveTypesInField(root Builder, seen []Builder, deps *dependencies, flb *FieldBuilder) error {
if flb.fieldType.foreignMsgType != nil {
deps.add(flb.fieldType.foreignMsgType.GetFile())
} else if flb.fieldType.foreignEnumType != nil {
deps.add(flb.fieldType.foreignEnumType.GetFile())
} else if flb.fieldType.localMsgType != nil {
if flb.fieldType.localMsgType == flb.msgType {
return r.resolveTypesInMessage(root, seen, deps, flb.msgType)
} else {
return r.resolveType(root, seen, flb.fieldType.localMsgType, deps)
}
} else if flb.fieldType.localEnumType != nil {
return r.resolveType(root, seen, flb.fieldType.localEnumType, deps)
}
return nil
}
func (r *dependencyResolver) resolveType(root Builder, seen []Builder, typeBuilder Builder, deps *dependencies) error {
otherRoot := getRoot(typeBuilder)
if root == otherRoot {
// local reference, so it will get resolved when we finish resolving this root
return nil
}
fd, err := r.resolveElement(otherRoot, seen)
if err != nil {
return err
}
deps.add(fd)
return nil
}
func (r *dependencyResolver) resolveTypesInFileOptions(root Builder, deps *dependencies, fb *FileBuilder) error {
for _, mb := range fb.messages {
if err := r.resolveTypesInMessageOptions(root, fb.origExts, deps, mb); err != nil {
return err
}
}
for _, eb := range fb.enums {
if err := r.resolveTypesInEnumOptions(root, fb.origExts, deps, eb); err != nil {
return err
}
}
for _, exb := range fb.extensions {
if err := r.resolveTypesInOptions(root, fb.origExts, deps, exb.Options); err != nil {
return err
}
}
for _, sb := range fb.services {
for _, mtb := range sb.methods {
if err := r.resolveTypesInOptions(root, fb.origExts, deps, mtb.Options); err != nil {
return err
}
}
if err := r.resolveTypesInOptions(root, fb.origExts, deps, sb.Options); err != nil {
return err
}
}
return r.resolveTypesInOptions(root, fb.origExts, deps, fb.Options)
}
func (r *dependencyResolver) resolveTypesInMessageOptions(root Builder, fileExts *dynamic.ExtensionRegistry, deps *dependencies, mb *MessageBuilder) error {
for _, b := range mb.fieldsAndOneOfs {
if flb, ok := b.(*FieldBuilder); ok {
if err := r.resolveTypesInOptions(root, fileExts, deps, flb.Options); err != nil {
return err
}
} else {
oob := b.(*OneOfBuilder)
for _, flb := range oob.choices {
if err := r.resolveTypesInOptions(root, fileExts, deps, flb.Options); err != nil {
return err
}
}
if err := r.resolveTypesInOptions(root, fileExts, deps, oob.Options); err != nil {
return err
}
}
}
for _, extr := range mb.ExtensionRanges {
if err := r.resolveTypesInOptions(root, fileExts, deps, extr.Options); err != nil {
return err
}
}
for _, eb := range mb.nestedEnums {
if err := r.resolveTypesInEnumOptions(root, fileExts, deps, eb); err != nil {
return err
}
}
for _, nmb := range mb.nestedMessages {
if err := r.resolveTypesInMessageOptions(root, fileExts, deps, nmb); err != nil {
return err
}
}
for _, exb := range mb.nestedExtensions {
if err := r.resolveTypesInOptions(root, fileExts, deps, exb.Options); err != nil {
return err
}
}
if err := r.resolveTypesInOptions(root, fileExts, deps, mb.Options); err != nil {
return err
}
return nil
}
func (r *dependencyResolver) resolveTypesInEnumOptions(root Builder, fileExts *dynamic.ExtensionRegistry, deps *dependencies, eb *EnumBuilder) error {
for _, evb := range eb.values {
if err := r.resolveTypesInOptions(root, fileExts, deps, evb.Options); err != nil {
return err
}
}
if err := r.resolveTypesInOptions(root, fileExts, deps, eb.Options); err != nil {
return err
}
return nil
}
func (r *dependencyResolver) resolveTypesInOptions(root Builder, fileExts *dynamic.ExtensionRegistry, deps *dependencies, opts proto.Message) error {
// nothing to see if opts is nil
if opts == nil {
return nil
}
if rv := reflect.ValueOf(opts); rv.Kind() == reflect.Ptr && rv.IsNil() {
return nil
}
ref := opts.ProtoReflect()
tags := map[int32]protoreflect.ExtensionType{}
proto.RangeExtensions(opts, func(xt protoreflect.ExtensionType, _ interface{}) bool {
num := int32(xt.TypeDescriptor().Number())
tags[num] = xt
return true
})
unk := ref.GetUnknown()
for len(unk) > 0 {
v, n := protowire.ConsumeVarint(unk)
if n < 0 {
break
}
unk = unk[n:]
num, t := protowire.DecodeTag(v)
if _, ok := tags[int32(num)]; !ok {
tags[int32(num)] = nil
}
switch t {
case protowire.VarintType:
_, n = protowire.ConsumeVarint(unk)
case protowire.Fixed64Type:
_, n = protowire.ConsumeFixed64(unk)
case protowire.BytesType:
_, n = protowire.ConsumeBytes(unk)
case protowire.StartGroupType:
_, n = protowire.ConsumeGroup(num, unk)
case protowire.EndGroupType:
// invalid encoding
break
case protowire.Fixed32Type:
_, n = protowire.ConsumeFixed32(unk)
}
if n < 0 {
break
}
unk = unk[n:]
}
msgName := string(proto.MessageName(opts))
for tag, xt := range tags {
// see if known dependencies have this option
if _, err := deps.res.FindExtensionByNumber(protoreflect.FullName(msgName), protoreflect.FieldNumber(tag)); err == nil {
// yep! nothing else to do
continue
}
// see if this extension is defined in *this* builder
if findExtension(root, msgName, tag) {
// yep!
continue
}
// see if configured extension registry knows about it
if extd := r.opts.Extensions.FindExtension(msgName, tag); extd != nil {
// extension registry recognized it!
deps.add(extd.GetFile())
continue
}
// see if given file extensions knows about it
if fileExts != nil {
extd := fileExts.FindExtension(msgName, tag)
if extd != nil {
// file extensions recognized it!
deps.add(extd.GetFile())
continue
}
}
if xt != nil {
// known extension? add its file to builder's deps
fd, err := desc.WrapFile(xt.TypeDescriptor().ParentFile())
if err != nil {
return err
}
deps.add(fd)
continue
}
if r.opts.RequireInterpretedOptions {
// we require options to be interpreted but are not able to!
return fmt.Errorf("could not interpret custom option for %s, tag %d", msgName, tag)
}
}
return nil
}
func findExtension(b Builder, messageName string, extTag int32) bool {
if fb, ok := b.(*FileBuilder); ok && findExtensionInFile(fb, messageName, extTag) {
return true
}
if mb, ok := b.(*MessageBuilder); ok && findExtensionInMessage(mb, messageName, extTag) {
return true
}
return false
}
func findExtensionInFile(fb *FileBuilder, messageName string, extTag int32) bool {
for _, extb := range fb.extensions {
if extb.GetExtendeeTypeName() == messageName && extb.number == extTag {
return true
}
}
for _, mb := range fb.messages {
if findExtensionInMessage(mb, messageName, extTag) {
return true
}
}
return false
}
func findExtensionInMessage(mb *MessageBuilder, messageName string, extTag int32) bool {
for _, extb := range mb.nestedExtensions {
if extb.GetExtendeeTypeName() == messageName && extb.number == extTag {
return true
}
}
for _, mb := range mb.nestedMessages {
if findExtensionInMessage(mb, messageName, extTag) {
return true
}
}
return false
}