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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 filetype provides functionality for wrapping descriptors
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// with Go type information.
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package filetype
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import (
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"reflect"
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"google.golang.org/protobuf/internal/descopts"
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"google.golang.org/protobuf/internal/filedesc"
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pimpl "google.golang.org/protobuf/internal/impl"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/reflect/protoregistry"
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)
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// Builder constructs type descriptors from a raw file descriptor
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// and associated Go types for each enum and message declaration.
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//
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// # Flattened Ordering
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//
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// The protobuf type system represents declarations as a tree. Certain nodes in
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// the tree require us to either associate it with a concrete Go type or to
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// resolve a dependency, which is information that must be provided separately
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// since it cannot be derived from the file descriptor alone.
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//
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// However, representing a tree as Go literals is difficult to simply do in a
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// space and time efficient way. Thus, we store them as a flattened list of
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// objects where the serialization order from the tree-based form is important.
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//
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// The "flattened ordering" is defined as a tree traversal of all enum, message,
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// extension, and service declarations using the following algorithm:
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//
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// def VisitFileDecls(fd):
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// for e in fd.Enums: yield e
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// for m in fd.Messages: yield m
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// for x in fd.Extensions: yield x
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// for s in fd.Services: yield s
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// for m in fd.Messages: yield from VisitMessageDecls(m)
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//
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// def VisitMessageDecls(md):
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// for e in md.Enums: yield e
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// for m in md.Messages: yield m
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// for x in md.Extensions: yield x
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// for m in md.Messages: yield from VisitMessageDecls(m)
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//
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// The traversal starts at the root file descriptor and yields each direct
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// declaration within each node before traversing into sub-declarations
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// that children themselves may have.
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type Builder struct {
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// File is the underlying file descriptor builder.
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File filedesc.Builder
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// GoTypes is a unique set of the Go types for all declarations and
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// dependencies. Each type is represented as a zero value of the Go type.
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//
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// Declarations are Go types generated for enums and messages directly
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// declared (not publicly imported) in the proto source file.
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// Messages for map entries are accounted for, but represented by nil.
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// Enum declarations in "flattened ordering" come first, followed by
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// message declarations in "flattened ordering".
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//
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// Dependencies are Go types for enums or messages referenced by
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// message fields (excluding weak fields), for parent extended messages of
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// extension fields, for enums or messages referenced by extension fields,
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// and for input and output messages referenced by service methods.
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// Dependencies must come after declarations, but the ordering of
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// dependencies themselves is unspecified.
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GoTypes []interface{}
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// DependencyIndexes is an ordered list of indexes into GoTypes for the
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// dependencies of messages, extensions, or services.
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//
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// There are 5 sub-lists in "flattened ordering" concatenated back-to-back:
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// 0. Message field dependencies: list of the enum or message type
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// referred to by every message field.
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// 1. Extension field targets: list of the extended parent message of
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// every extension.
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// 2. Extension field dependencies: list of the enum or message type
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// referred to by every extension field.
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// 3. Service method inputs: list of the input message type
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// referred to by every service method.
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// 4. Service method outputs: list of the output message type
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// referred to by every service method.
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//
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// The offset into DependencyIndexes for the start of each sub-list
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// is appended to the end in reverse order.
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DependencyIndexes []int32
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// EnumInfos is a list of enum infos in "flattened ordering".
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EnumInfos []pimpl.EnumInfo
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// MessageInfos is a list of message infos in "flattened ordering".
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// If provided, the GoType and PBType for each element is populated.
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//
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// Requirement: len(MessageInfos) == len(Build.Messages)
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MessageInfos []pimpl.MessageInfo
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// ExtensionInfos is a list of extension infos in "flattened ordering".
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// Each element is initialized and registered with the protoregistry package.
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//
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// Requirement: len(LegacyExtensions) == len(Build.Extensions)
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ExtensionInfos []pimpl.ExtensionInfo
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// TypeRegistry is the registry to register each type descriptor.
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// If nil, it uses protoregistry.GlobalTypes.
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TypeRegistry interface {
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RegisterMessage(protoreflect.MessageType) error
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RegisterEnum(protoreflect.EnumType) error
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RegisterExtension(protoreflect.ExtensionType) error
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}
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}
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// Out is the output of the builder.
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type Out struct {
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File protoreflect.FileDescriptor
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}
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func (tb Builder) Build() (out Out) {
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// Replace the resolver with one that resolves dependencies by index,
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// which is faster and more reliable than relying on the global registry.
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if tb.File.FileRegistry == nil {
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tb.File.FileRegistry = protoregistry.GlobalFiles
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}
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tb.File.FileRegistry = &resolverByIndex{
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goTypes: tb.GoTypes,
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depIdxs: tb.DependencyIndexes,
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fileRegistry: tb.File.FileRegistry,
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}
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// Initialize registry if unpopulated.
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if tb.TypeRegistry == nil {
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tb.TypeRegistry = protoregistry.GlobalTypes
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}
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fbOut := tb.File.Build()
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out.File = fbOut.File
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// Process enums.
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enumGoTypes := tb.GoTypes[:len(fbOut.Enums)]
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if len(tb.EnumInfos) != len(fbOut.Enums) {
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panic("mismatching enum lengths")
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}
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if len(fbOut.Enums) > 0 {
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for i := range fbOut.Enums {
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tb.EnumInfos[i] = pimpl.EnumInfo{
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GoReflectType: reflect.TypeOf(enumGoTypes[i]),
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Desc: &fbOut.Enums[i],
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}
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// Register enum types.
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if err := tb.TypeRegistry.RegisterEnum(&tb.EnumInfos[i]); err != nil {
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panic(err)
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}
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}
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}
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// Process messages.
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messageGoTypes := tb.GoTypes[len(fbOut.Enums):][:len(fbOut.Messages)]
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if len(tb.MessageInfos) != len(fbOut.Messages) {
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panic("mismatching message lengths")
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}
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if len(fbOut.Messages) > 0 {
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for i := range fbOut.Messages {
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if messageGoTypes[i] == nil {
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continue // skip map entry
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}
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tb.MessageInfos[i].GoReflectType = reflect.TypeOf(messageGoTypes[i])
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tb.MessageInfos[i].Desc = &fbOut.Messages[i]
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// Register message types.
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if err := tb.TypeRegistry.RegisterMessage(&tb.MessageInfos[i]); err != nil {
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panic(err)
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}
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}
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// As a special-case for descriptor.proto,
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// locally register concrete message type for the options.
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if out.File.Path() == "google/protobuf/descriptor.proto" && out.File.Package() == "google.protobuf" {
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for i := range fbOut.Messages {
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switch fbOut.Messages[i].Name() {
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case "FileOptions":
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descopts.File = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "EnumOptions":
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descopts.Enum = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "EnumValueOptions":
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descopts.EnumValue = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "MessageOptions":
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descopts.Message = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "FieldOptions":
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descopts.Field = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "OneofOptions":
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descopts.Oneof = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "ExtensionRangeOptions":
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descopts.ExtensionRange = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "ServiceOptions":
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descopts.Service = messageGoTypes[i].(protoreflect.ProtoMessage)
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case "MethodOptions":
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descopts.Method = messageGoTypes[i].(protoreflect.ProtoMessage)
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}
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}
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}
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}
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// Process extensions.
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if len(tb.ExtensionInfos) != len(fbOut.Extensions) {
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panic("mismatching extension lengths")
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}
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var depIdx int32
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for i := range fbOut.Extensions {
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// For enum and message kinds, determine the referent Go type so
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// that we can construct their constructors.
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const listExtDeps = 2
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var goType reflect.Type
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switch fbOut.Extensions[i].L1.Kind {
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case protoreflect.EnumKind:
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j := depIdxs.Get(tb.DependencyIndexes, listExtDeps, depIdx)
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goType = reflect.TypeOf(tb.GoTypes[j])
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depIdx++
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case protoreflect.MessageKind, protoreflect.GroupKind:
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j := depIdxs.Get(tb.DependencyIndexes, listExtDeps, depIdx)
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goType = reflect.TypeOf(tb.GoTypes[j])
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depIdx++
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default:
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goType = goTypeForPBKind[fbOut.Extensions[i].L1.Kind]
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}
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if fbOut.Extensions[i].IsList() {
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goType = reflect.SliceOf(goType)
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}
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pimpl.InitExtensionInfo(&tb.ExtensionInfos[i], &fbOut.Extensions[i], goType)
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// Register extension types.
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if err := tb.TypeRegistry.RegisterExtension(&tb.ExtensionInfos[i]); err != nil {
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panic(err)
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}
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}
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return out
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}
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var goTypeForPBKind = map[protoreflect.Kind]reflect.Type{
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protoreflect.BoolKind: reflect.TypeOf(bool(false)),
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protoreflect.Int32Kind: reflect.TypeOf(int32(0)),
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protoreflect.Sint32Kind: reflect.TypeOf(int32(0)),
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protoreflect.Sfixed32Kind: reflect.TypeOf(int32(0)),
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protoreflect.Int64Kind: reflect.TypeOf(int64(0)),
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protoreflect.Sint64Kind: reflect.TypeOf(int64(0)),
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protoreflect.Sfixed64Kind: reflect.TypeOf(int64(0)),
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protoreflect.Uint32Kind: reflect.TypeOf(uint32(0)),
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protoreflect.Fixed32Kind: reflect.TypeOf(uint32(0)),
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protoreflect.Uint64Kind: reflect.TypeOf(uint64(0)),
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protoreflect.Fixed64Kind: reflect.TypeOf(uint64(0)),
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protoreflect.FloatKind: reflect.TypeOf(float32(0)),
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protoreflect.DoubleKind: reflect.TypeOf(float64(0)),
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protoreflect.StringKind: reflect.TypeOf(string("")),
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protoreflect.BytesKind: reflect.TypeOf([]byte(nil)),
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}
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type depIdxs []int32
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// Get retrieves the jth element of the ith sub-list.
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func (x depIdxs) Get(i, j int32) int32 {
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return x[x[int32(len(x))-i-1]+j]
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}
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type (
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resolverByIndex struct {
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goTypes []interface{}
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depIdxs depIdxs
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fileRegistry
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}
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fileRegistry interface {
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FindFileByPath(string) (protoreflect.FileDescriptor, error)
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FindDescriptorByName(protoreflect.FullName) (protoreflect.Descriptor, error)
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RegisterFile(protoreflect.FileDescriptor) error
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}
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)
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func (r *resolverByIndex) FindEnumByIndex(i, j int32, es []filedesc.Enum, ms []filedesc.Message) protoreflect.EnumDescriptor {
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if depIdx := int(r.depIdxs.Get(i, j)); int(depIdx) < len(es)+len(ms) {
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return &es[depIdx]
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} else {
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return pimpl.Export{}.EnumDescriptorOf(r.goTypes[depIdx])
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}
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}
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func (r *resolverByIndex) FindMessageByIndex(i, j int32, es []filedesc.Enum, ms []filedesc.Message) protoreflect.MessageDescriptor {
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if depIdx := int(r.depIdxs.Get(i, j)); depIdx < len(es)+len(ms) {
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return &ms[depIdx-len(es)]
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} else {
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return pimpl.Export{}.MessageDescriptorOf(r.goTypes[depIdx])
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}
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}
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