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wrappers.go
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wrappers.go
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// Copyright 2018 Twitch Interactive, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may not
// use this file except in compliance with the License. A copy of the License is
// located at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// or in the "license" file accompanying this file. This file is distributed on
// an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
//
//
// This file contains some code from https://github.com/golang/protobuf:
// Copyright 2010 The Go Authors. All rights reserved.
// https://github.com/golang/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package gen
import (
"fmt"
"log"
"path"
"strconv"
"strings"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
"github.com/twitchtv/twirp/internal/gen/stringutils"
)
// Each type we import as a protocol buffer (other than FileDescriptorProto) needs
// a pointer to the FileDescriptorProto that represents it. These types achieve that
// wrapping by placing each Proto inside a struct with the pointer to its File. The
// structs have the same names as their contents, with "Proto" removed.
// FileDescriptor is used to store the things that it points to.
// WrapTypes walks the incoming data, wrapping DescriptorProtos, EnumDescriptorProtos
// and FileDescriptorProtos into file-referenced objects within the Generator.
// It also creates the list of files to generate and so should be called before GenerateAllFiles.
func WrapTypes(req *plugin.CodeGeneratorRequest) (genFiles, allFiles []*FileDescriptor, allFilesByName map[string]*FileDescriptor) {
allFiles = make([]*FileDescriptor, 0, len(req.ProtoFile))
allFilesByName = make(map[string]*FileDescriptor, len(allFiles))
for _, f := range req.ProtoFile {
// We must wrap the descriptors before we wrap the enums
descs := wrapDescriptors(f)
buildNestedDescriptors(descs)
enums := wrapEnumDescriptors(f, descs)
buildNestedEnums(descs, enums)
exts := wrapExtensions(f)
svcs := wrapServices(f)
fd := &FileDescriptor{
FileDescriptorProto: f,
Services: svcs,
Descriptors: descs,
Enums: enums,
Extensions: exts,
proto3: fileIsProto3(f),
}
extractComments(fd)
allFiles = append(allFiles, fd)
allFilesByName[f.GetName()] = fd
}
for _, fd := range allFiles {
fd.Imported = wrapImported(fd.FileDescriptorProto, allFilesByName)
}
genFiles = make([]*FileDescriptor, 0, len(req.FileToGenerate))
for _, fileName := range req.FileToGenerate {
fd := allFilesByName[fileName]
if fd == nil {
Fail("could not find file named", fileName)
}
fd.Index = len(genFiles)
genFiles = append(genFiles, fd)
}
return genFiles, allFiles, allFilesByName
}
// The file and package name method are common to messages and enums.
type common struct {
file *descriptor.FileDescriptorProto // File this object comes from.
}
func (c *common) File() *descriptor.FileDescriptorProto { return c.file }
func fileIsProto3(file *descriptor.FileDescriptorProto) bool {
return file.GetSyntax() == "proto3"
}
func (c *common) proto3() bool { return fileIsProto3(c.file) }
// Descriptor represents a protocol buffer message.
type Descriptor struct {
common
*descriptor.DescriptorProto
Parent *Descriptor // The containing message, if any.
nested []*Descriptor // Inner messages, if any.
enums []*EnumDescriptor // Inner enums, if any.
ext []*ExtensionDescriptor // Extensions, if any.
typename []string // Cached typename vector.
index int // The index into the container, whether the file or another message.
path string // The SourceCodeInfo path as comma-separated integers.
group bool
}
func newDescriptor(desc *descriptor.DescriptorProto, parent *Descriptor, file *descriptor.FileDescriptorProto, index int) *Descriptor {
d := &Descriptor{
common: common{file},
DescriptorProto: desc,
Parent: parent,
index: index,
}
if parent == nil {
d.path = fmt.Sprintf("%d,%d", messagePath, index)
} else {
d.path = fmt.Sprintf("%s,%d,%d", parent.path, messageMessagePath, index)
}
// The only way to distinguish a group from a message is whether
// the containing message has a TYPE_GROUP field that matches.
if parent != nil {
parts := d.TypeName()
if file.Package != nil {
parts = append([]string{*file.Package}, parts...)
}
exp := "." + strings.Join(parts, ".")
for _, field := range parent.Field {
if field.GetType() == descriptor.FieldDescriptorProto_TYPE_GROUP && field.GetTypeName() == exp {
d.group = true
break
}
}
}
for _, field := range desc.Extension {
d.ext = append(d.ext, &ExtensionDescriptor{common{file}, field, d})
}
return d
}
// Return a slice of all the Descriptors defined within this file
func wrapDescriptors(file *descriptor.FileDescriptorProto) []*Descriptor {
sl := make([]*Descriptor, 0, len(file.MessageType)+10)
for i, desc := range file.MessageType {
sl = wrapThisDescriptor(sl, desc, nil, file, i)
}
return sl
}
// Wrap this Descriptor, recursively
func wrapThisDescriptor(sl []*Descriptor, desc *descriptor.DescriptorProto, parent *Descriptor, file *descriptor.FileDescriptorProto, index int) []*Descriptor {
sl = append(sl, newDescriptor(desc, parent, file, index))
me := sl[len(sl)-1]
for i, nested := range desc.NestedType {
sl = wrapThisDescriptor(sl, nested, me, file, i)
}
return sl
}
func buildNestedDescriptors(descs []*Descriptor) {
for _, desc := range descs {
if len(desc.NestedType) != 0 {
for _, nest := range descs {
if nest.Parent == desc {
desc.nested = append(desc.nested, nest)
}
}
if len(desc.nested) != len(desc.NestedType) {
Fail("internal error: nesting failure for", desc.GetName())
}
}
}
}
// TypeName returns the elements of the dotted type name.
// The package name is not part of this name.
func (d *Descriptor) TypeName() []string {
if d.typename != nil {
return d.typename
}
n := 0
for parent := d; parent != nil; parent = parent.Parent {
n++
}
s := make([]string, n, n)
for parent := d; parent != nil; parent = parent.Parent {
n--
s[n] = parent.GetName()
}
d.typename = s
return s
}
// EnumDescriptor describes an enum. If it's at top level, its parent will be nil.
// Otherwise it will be the descriptor of the message in which it is defined.
type EnumDescriptor struct {
common
*descriptor.EnumDescriptorProto
parent *Descriptor // The containing message, if any.
typename []string // Cached typename vector.
index int // The index into the container, whether the file or a message.
path string // The SourceCodeInfo path as comma-separated integers.
}
// Construct a new EnumDescriptor
func newEnumDescriptor(desc *descriptor.EnumDescriptorProto, parent *Descriptor, file *descriptor.FileDescriptorProto, index int) *EnumDescriptor {
ed := &EnumDescriptor{
common: common{file},
EnumDescriptorProto: desc,
parent: parent,
index: index,
}
if parent == nil {
ed.path = fmt.Sprintf("%d,%d", enumPath, index)
} else {
ed.path = fmt.Sprintf("%s,%d,%d", parent.path, messageEnumPath, index)
}
return ed
}
// Return a slice of all the EnumDescriptors defined within this file
func wrapEnumDescriptors(file *descriptor.FileDescriptorProto, descs []*Descriptor) []*EnumDescriptor {
sl := make([]*EnumDescriptor, 0, len(file.EnumType)+10)
// Top-level enums.
for i, enum := range file.EnumType {
sl = append(sl, newEnumDescriptor(enum, nil, file, i))
}
// Enums within messages. Enums within embedded messages appear in the outer-most message.
for _, nested := range descs {
for i, enum := range nested.EnumType {
sl = append(sl, newEnumDescriptor(enum, nested, file, i))
}
}
return sl
}
func buildNestedEnums(descs []*Descriptor, enums []*EnumDescriptor) {
for _, desc := range descs {
if len(desc.EnumType) != 0 {
for _, enum := range enums {
if enum.parent == desc {
desc.enums = append(desc.enums, enum)
}
}
if len(desc.enums) != len(desc.EnumType) {
Fail("internal error: enum nesting failure for", desc.GetName())
}
}
}
}
// TypeName returns the elements of the dotted type name.
// The package name is not part of this name.
func (e *EnumDescriptor) TypeName() (s []string) {
if e.typename != nil {
return e.typename
}
name := e.GetName()
if e.parent == nil {
s = make([]string, 1)
} else {
pname := e.parent.TypeName()
s = make([]string, len(pname)+1)
copy(s, pname)
}
s[len(s)-1] = name
e.typename = s
return s
}
// Everything but the last element of the full type name, CamelCased.
// The values of type Foo.Bar are call Foo_value1... not Foo_Bar_value1... .
func (e *EnumDescriptor) prefix() string {
if e.parent == nil {
// If the enum is not part of a message, the prefix is just the type name.
return stringutils.CamelCase(*e.Name) + "_"
}
typeName := e.TypeName()
return stringutils.CamelCaseSlice(typeName[0:len(typeName)-1]) + "_"
}
// The integer value of the named constant in this enumerated type.
func (e *EnumDescriptor) integerValueAsString(name string) string {
for _, c := range e.Value {
if c.GetName() == name {
return fmt.Sprint(c.GetNumber())
}
}
log.Fatal("cannot find value for enum constant")
return ""
}
// ExtensionDescriptor describes an extension. If it's at top level, its parent will be nil.
// Otherwise it will be the descriptor of the message in which it is defined.
type ExtensionDescriptor struct {
common
*descriptor.FieldDescriptorProto
parent *Descriptor // The containing message, if any.
}
// Return a slice of all the top-level ExtensionDescriptors defined within this file.
func wrapExtensions(file *descriptor.FileDescriptorProto) []*ExtensionDescriptor {
var sl []*ExtensionDescriptor
for _, field := range file.Extension {
sl = append(sl, &ExtensionDescriptor{common{file}, field, nil})
}
return sl
}
// TypeName returns the elements of the dotted type name.
// The package name is not part of this name.
func (e *ExtensionDescriptor) TypeName() (s []string) {
name := e.GetName()
if e.parent == nil {
// top-level extension
s = make([]string, 1)
} else {
pname := e.parent.TypeName()
s = make([]string, len(pname)+1)
copy(s, pname)
}
s[len(s)-1] = name
return s
}
// DescName returns the variable name used for the generated descriptor.
func (e *ExtensionDescriptor) DescName() string {
// The full type name.
typeName := e.TypeName()
// Each scope of the extension is individually CamelCased, and all are joined with "_" with an "E_" prefix.
for i, s := range typeName {
typeName[i] = stringutils.CamelCase(s)
}
return "E_" + strings.Join(typeName, "_")
}
// ImportedDescriptor describes a type that has been publicly imported from another file.
type ImportedDescriptor struct {
common
Object Object
}
// Return a slice of all the types that are publicly imported into this file.
func wrapImported(file *descriptor.FileDescriptorProto, fileMap map[string]*FileDescriptor) (sl []*ImportedDescriptor) {
for _, index := range file.PublicDependency {
df := fileMap[file.Dependency[index]]
for _, d := range df.Descriptors {
if d.GetOptions().GetMapEntry() {
continue
}
sl = append(sl, &ImportedDescriptor{common{file}, d})
}
for _, e := range df.Enums {
sl = append(sl, &ImportedDescriptor{common{file}, e})
}
for _, ext := range df.Extensions {
sl = append(sl, &ImportedDescriptor{common{file}, ext})
}
}
return
}
func (id *ImportedDescriptor) TypeName() []string { return id.Object.TypeName() }
// ServiceDescriptor represents a protocol buffer service.
type ServiceDescriptor struct {
common
*descriptor.ServiceDescriptorProto
Methods []*MethodDescriptor
Index int // index of the ServiceDescriptorProto in its parent FileDescriptorProto
Path string // The SourceCodeInfo path as comma-separated integers.
}
func (sd *ServiceDescriptor) TypeName() []string {
return []string{sd.GetName()}
}
func wrapServices(file *descriptor.FileDescriptorProto) (sl []*ServiceDescriptor) {
for i, svc := range file.Service {
sd := &ServiceDescriptor{
common: common{file},
ServiceDescriptorProto: svc,
Index: i,
Path: fmt.Sprintf("%d,%d", servicePath, i),
}
for j, method := range svc.Method {
md := &MethodDescriptor{
common: common{file},
MethodDescriptorProto: method,
service: sd,
Path: fmt.Sprintf("%d,%d,%d,%d", servicePath, i, serviceMethodPath, j),
}
sd.Methods = append(sd.Methods, md)
}
sl = append(sl, sd)
}
return sl
}
// MethodDescriptor represents an RPC method on a protocol buffer
// service.
type MethodDescriptor struct {
common
*descriptor.MethodDescriptorProto
service *ServiceDescriptor
Path string // The SourceCodeInfo path as comma-separated integers.
}
func (md *MethodDescriptor) TypeName() []string {
return []string{md.service.GetName(), md.GetName()}
}
// FileDescriptor describes an protocol buffer descriptor file (.proto).
// It includes slices of all the messages and enums defined within it.
// Those slices are constructed by WrapTypes.
type FileDescriptor struct {
*descriptor.FileDescriptorProto
Descriptors []*Descriptor // All the messages defined in this file.
Enums []*EnumDescriptor // All the enums defined in this file.
Extensions []*ExtensionDescriptor // All the top-level extensions defined in this file.
Imported []*ImportedDescriptor // All types defined in files publicly imported by this file.
Services []*ServiceDescriptor // All the services defined in this file.
// Comments, stored as a map of path (comma-separated integers) to the comment.
Comments map[string]*descriptor.SourceCodeInfo_Location
Index int // The index of this file in the list of files to generate code for
proto3 bool // whether to generate proto3 code for this file
}
// VarName is the variable name used in generated code to refer to the
// compressed bytes of this descriptor. It is not exported, so it is only valid
// inside the generated package.
//
// protoc-gen-go writes its own version of this file, but so does
// protoc-gen-gogo - with a different name! Twirp aims to be compatible with
// both; the simplest way forward is to write the file descriptor again as
// another variable that we control.
func (d *FileDescriptor) VarName() string { return fmt.Sprintf("twirpFileDescriptor%d", d.Index) }
func (d *FileDescriptor) PackageComments() string {
if loc, ok := d.Comments[strconv.Itoa(packagePath)]; ok {
text := strings.TrimSuffix(loc.GetLeadingComments(), "\n")
return text
}
return ""
}
func (d *FileDescriptor) BaseFileName() string {
name := *d.Name
if ext := path.Ext(name); ext == ".proto" || ext == ".protodevel" {
name = name[:len(name)-len(ext)]
}
return name
}
func extractComments(file *FileDescriptor) {
file.Comments = make(map[string]*descriptor.SourceCodeInfo_Location)
for _, loc := range file.GetSourceCodeInfo().GetLocation() {
if loc.LeadingComments == nil {
continue
}
var p []string
for _, n := range loc.Path {
p = append(p, strconv.Itoa(int(n)))
}
file.Comments[strings.Join(p, ",")] = loc
}
}
type messageSymbol struct {
sym string
hasExtensions, isMessageSet bool
hasOneof bool
getters []getterSymbol
}
type getterSymbol struct {
name string
typ string
typeName string // canonical name in proto world; empty for proto.Message and similar
genType bool // whether typ contains a generated type (message/group/enum)
}
// Object is an interface abstracting the abilities shared by enums, messages, extensions and imported objects.
type Object interface {
TypeName() []string
File() *descriptor.FileDescriptorProto
}
// The SourceCodeInfo message describes the location of elements of a parsed
// .proto file by way of a "path", which is a sequence of integers that
// describe the route from a FileDescriptorProto to the relevant submessage.
// The path alternates between a field number of a repeated field, and an index
// into that repeated field. The constants below define the field numbers that
// are used.
//
// See descriptor.proto for more information about this.
const (
// tag numbers in FileDescriptorProto
packagePath = 2 // package
messagePath = 4 // message_type
enumPath = 5 // enum_type
servicePath = 6 // service
// tag numbers in DescriptorProto
messageFieldPath = 2 // field
messageMessagePath = 3 // nested_type
messageEnumPath = 4 // enum_type
messageOneofPath = 8 // oneof_decl
// tag numbers in ServiceDescriptorProto
serviceNamePath = 1 // name
serviceMethodPath = 2 // method
serviceOptionsPath = 3 // options
// tag numbers in MethodDescriptorProto
methodNamePath = 1 // name
methodInputPath = 2 // input_type
methodOutputPath = 3 // output_type
)