mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-23 07:01:41 +00:00
277 lines
10 KiB
Go
277 lines
10 KiB
Go
// Copyright 2018 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 protodesc provides functionality for converting
|
|
// FileDescriptorProto messages to/from protoreflect.FileDescriptor values.
|
|
//
|
|
// The google.protobuf.FileDescriptorProto is a protobuf message that describes
|
|
// the type information for a .proto file in a form that is easily serializable.
|
|
// The protoreflect.FileDescriptor is a more structured representation of
|
|
// the FileDescriptorProto message where references and remote dependencies
|
|
// can be directly followed.
|
|
package protodesc
|
|
|
|
import (
|
|
"google.golang.org/protobuf/internal/errors"
|
|
"google.golang.org/protobuf/internal/filedesc"
|
|
"google.golang.org/protobuf/internal/pragma"
|
|
"google.golang.org/protobuf/internal/strs"
|
|
"google.golang.org/protobuf/proto"
|
|
"google.golang.org/protobuf/reflect/protoreflect"
|
|
"google.golang.org/protobuf/reflect/protoregistry"
|
|
|
|
"google.golang.org/protobuf/types/descriptorpb"
|
|
)
|
|
|
|
// Resolver is the resolver used by NewFile to resolve dependencies.
|
|
// The enums and messages provided must belong to some parent file,
|
|
// which is also registered.
|
|
//
|
|
// It is implemented by protoregistry.Files.
|
|
type Resolver interface {
|
|
FindFileByPath(string) (protoreflect.FileDescriptor, error)
|
|
FindDescriptorByName(protoreflect.FullName) (protoreflect.Descriptor, error)
|
|
}
|
|
|
|
// FileOptions configures the construction of file descriptors.
|
|
type FileOptions struct {
|
|
pragma.NoUnkeyedLiterals
|
|
|
|
// AllowUnresolvable configures New to permissively allow unresolvable
|
|
// file, enum, or message dependencies. Unresolved dependencies are replaced
|
|
// by placeholder equivalents.
|
|
//
|
|
// The following dependencies may be left unresolved:
|
|
// • Resolving an imported file.
|
|
// • Resolving the type for a message field or extension field.
|
|
// If the kind of the field is unknown, then a placeholder is used for both
|
|
// the Enum and Message accessors on the protoreflect.FieldDescriptor.
|
|
// • Resolving an enum value set as the default for an optional enum field.
|
|
// If unresolvable, the protoreflect.FieldDescriptor.Default is set to the
|
|
// first value in the associated enum (or zero if the also enum dependency
|
|
// is also unresolvable). The protoreflect.FieldDescriptor.DefaultEnumValue
|
|
// is populated with a placeholder.
|
|
// • Resolving the extended message type for an extension field.
|
|
// • Resolving the input or output message type for a service method.
|
|
//
|
|
// If the unresolved dependency uses a relative name,
|
|
// then the placeholder will contain an invalid FullName with a "*." prefix,
|
|
// indicating that the starting prefix of the full name is unknown.
|
|
AllowUnresolvable bool
|
|
}
|
|
|
|
// NewFile creates a new protoreflect.FileDescriptor from the provided
|
|
// file descriptor message. See FileOptions.New for more information.
|
|
func NewFile(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
|
|
return FileOptions{}.New(fd, r)
|
|
}
|
|
|
|
// NewFiles creates a new protoregistry.Files from the provided
|
|
// FileDescriptorSet message. See FileOptions.NewFiles for more information.
|
|
func NewFiles(fd *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
|
|
return FileOptions{}.NewFiles(fd)
|
|
}
|
|
|
|
// New creates a new protoreflect.FileDescriptor from the provided
|
|
// file descriptor message. The file must represent a valid proto file according
|
|
// to protobuf semantics. The returned descriptor is a deep copy of the input.
|
|
//
|
|
// Any imported files, enum types, or message types referenced in the file are
|
|
// resolved using the provided registry. When looking up an import file path,
|
|
// the path must be unique. The newly created file descriptor is not registered
|
|
// back into the provided file registry.
|
|
func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
|
|
if r == nil {
|
|
r = (*protoregistry.Files)(nil) // empty resolver
|
|
}
|
|
|
|
// Handle the file descriptor content.
|
|
f := &filedesc.File{L2: &filedesc.FileL2{}}
|
|
switch fd.GetSyntax() {
|
|
case "proto2", "":
|
|
f.L1.Syntax = protoreflect.Proto2
|
|
case "proto3":
|
|
f.L1.Syntax = protoreflect.Proto3
|
|
default:
|
|
return nil, errors.New("invalid syntax: %q", fd.GetSyntax())
|
|
}
|
|
f.L1.Path = fd.GetName()
|
|
if f.L1.Path == "" {
|
|
return nil, errors.New("file path must be populated")
|
|
}
|
|
f.L1.Package = protoreflect.FullName(fd.GetPackage())
|
|
if !f.L1.Package.IsValid() && f.L1.Package != "" {
|
|
return nil, errors.New("invalid package: %q", f.L1.Package)
|
|
}
|
|
if opts := fd.GetOptions(); opts != nil {
|
|
opts = proto.Clone(opts).(*descriptorpb.FileOptions)
|
|
f.L2.Options = func() protoreflect.ProtoMessage { return opts }
|
|
}
|
|
|
|
f.L2.Imports = make(filedesc.FileImports, len(fd.GetDependency()))
|
|
for _, i := range fd.GetPublicDependency() {
|
|
if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsPublic {
|
|
return nil, errors.New("invalid or duplicate public import index: %d", i)
|
|
}
|
|
f.L2.Imports[i].IsPublic = true
|
|
}
|
|
for _, i := range fd.GetWeakDependency() {
|
|
if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsWeak {
|
|
return nil, errors.New("invalid or duplicate weak import index: %d", i)
|
|
}
|
|
f.L2.Imports[i].IsWeak = true
|
|
}
|
|
imps := importSet{f.Path(): true}
|
|
for i, path := range fd.GetDependency() {
|
|
imp := &f.L2.Imports[i]
|
|
f, err := r.FindFileByPath(path)
|
|
if err == protoregistry.NotFound && (o.AllowUnresolvable || imp.IsWeak) {
|
|
f = filedesc.PlaceholderFile(path)
|
|
} else if err != nil {
|
|
return nil, errors.New("could not resolve import %q: %v", path, err)
|
|
}
|
|
imp.FileDescriptor = f
|
|
|
|
if imps[imp.Path()] {
|
|
return nil, errors.New("already imported %q", path)
|
|
}
|
|
imps[imp.Path()] = true
|
|
}
|
|
for i := range fd.GetDependency() {
|
|
imp := &f.L2.Imports[i]
|
|
imps.importPublic(imp.Imports())
|
|
}
|
|
|
|
// Handle source locations.
|
|
f.L2.Locations.File = f
|
|
for _, loc := range fd.GetSourceCodeInfo().GetLocation() {
|
|
var l protoreflect.SourceLocation
|
|
// TODO: Validate that the path points to an actual declaration?
|
|
l.Path = protoreflect.SourcePath(loc.GetPath())
|
|
s := loc.GetSpan()
|
|
switch len(s) {
|
|
case 3:
|
|
l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[0]), int(s[2])
|
|
case 4:
|
|
l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[2]), int(s[3])
|
|
default:
|
|
return nil, errors.New("invalid span: %v", s)
|
|
}
|
|
// TODO: Validate that the span information is sensible?
|
|
// See https://github.com/protocolbuffers/protobuf/issues/6378.
|
|
if false && (l.EndLine < l.StartLine || l.StartLine < 0 || l.StartColumn < 0 || l.EndColumn < 0 ||
|
|
(l.StartLine == l.EndLine && l.EndColumn <= l.StartColumn)) {
|
|
return nil, errors.New("invalid span: %v", s)
|
|
}
|
|
l.LeadingDetachedComments = loc.GetLeadingDetachedComments()
|
|
l.LeadingComments = loc.GetLeadingComments()
|
|
l.TrailingComments = loc.GetTrailingComments()
|
|
f.L2.Locations.List = append(f.L2.Locations.List, l)
|
|
}
|
|
|
|
// Step 1: Allocate and derive the names for all declarations.
|
|
// This copies all fields from the descriptor proto except:
|
|
// google.protobuf.FieldDescriptorProto.type_name
|
|
// google.protobuf.FieldDescriptorProto.default_value
|
|
// google.protobuf.FieldDescriptorProto.oneof_index
|
|
// google.protobuf.FieldDescriptorProto.extendee
|
|
// google.protobuf.MethodDescriptorProto.input
|
|
// google.protobuf.MethodDescriptorProto.output
|
|
var err error
|
|
sb := new(strs.Builder)
|
|
r1 := make(descsByName)
|
|
if f.L1.Enums.List, err = r1.initEnumDeclarations(fd.GetEnumType(), f, sb); err != nil {
|
|
return nil, err
|
|
}
|
|
if f.L1.Messages.List, err = r1.initMessagesDeclarations(fd.GetMessageType(), f, sb); err != nil {
|
|
return nil, err
|
|
}
|
|
if f.L1.Extensions.List, err = r1.initExtensionDeclarations(fd.GetExtension(), f, sb); err != nil {
|
|
return nil, err
|
|
}
|
|
if f.L1.Services.List, err = r1.initServiceDeclarations(fd.GetService(), f, sb); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Step 2: Resolve every dependency reference not handled by step 1.
|
|
r2 := &resolver{local: r1, remote: r, imports: imps, allowUnresolvable: o.AllowUnresolvable}
|
|
if err := r2.resolveMessageDependencies(f.L1.Messages.List, fd.GetMessageType()); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := r2.resolveExtensionDependencies(f.L1.Extensions.List, fd.GetExtension()); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := r2.resolveServiceDependencies(f.L1.Services.List, fd.GetService()); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Step 3: Validate every enum, message, and extension declaration.
|
|
if err := validateEnumDeclarations(f.L1.Enums.List, fd.GetEnumType()); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := validateMessageDeclarations(f.L1.Messages.List, fd.GetMessageType()); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := validateExtensionDeclarations(f.L1.Extensions.List, fd.GetExtension()); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return f, nil
|
|
}
|
|
|
|
type importSet map[string]bool
|
|
|
|
func (is importSet) importPublic(imps protoreflect.FileImports) {
|
|
for i := 0; i < imps.Len(); i++ {
|
|
if imp := imps.Get(i); imp.IsPublic {
|
|
is[imp.Path()] = true
|
|
is.importPublic(imp.Imports())
|
|
}
|
|
}
|
|
}
|
|
|
|
// NewFiles creates a new protoregistry.Files from the provided
|
|
// FileDescriptorSet message. The descriptor set must include only
|
|
// valid files according to protobuf semantics. The returned descriptors
|
|
// are a deep copy of the input.
|
|
func (o FileOptions) NewFiles(fds *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
|
|
files := make(map[string]*descriptorpb.FileDescriptorProto)
|
|
for _, fd := range fds.File {
|
|
if _, ok := files[fd.GetName()]; ok {
|
|
return nil, errors.New("file appears multiple times: %q", fd.GetName())
|
|
}
|
|
files[fd.GetName()] = fd
|
|
}
|
|
r := &protoregistry.Files{}
|
|
for _, fd := range files {
|
|
if err := o.addFileDeps(r, fd, files); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return r, nil
|
|
}
|
|
func (o FileOptions) addFileDeps(r *protoregistry.Files, fd *descriptorpb.FileDescriptorProto, files map[string]*descriptorpb.FileDescriptorProto) error {
|
|
// Set the entry to nil while descending into a file's dependencies to detect cycles.
|
|
files[fd.GetName()] = nil
|
|
for _, dep := range fd.Dependency {
|
|
depfd, ok := files[dep]
|
|
if depfd == nil {
|
|
if ok {
|
|
return errors.New("import cycle in file: %q", dep)
|
|
}
|
|
continue
|
|
}
|
|
if err := o.addFileDeps(r, depfd, files); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
// Delete the entry once dependencies are processed.
|
|
delete(files, fd.GetName())
|
|
f, err := o.New(fd, r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return r.RegisterFile(f)
|
|
}
|