diff --git a/cmd/protoc-gen-micro/README.md b/cmd/protoc-gen-micro/README.md new file mode 100644 index 0000000000..111421034e --- /dev/null +++ b/cmd/protoc-gen-micro/README.md @@ -0,0 +1,144 @@ +# protoc-gen-micro + +This is protobuf code generation for go-micro. We use protoc-gen-micro to reduce boilerplate code. + +## Install + +``` +go install github.com/micro/go-micro/cmd/protoc-gen-micro +``` + +Also required: + +- [protoc](https://github.com/google/protobuf) +- [protoc-gen-go](https://google.golang.org/protobuf) + +## Usage + +Define your service as `greeter.proto` + +``` +syntax = "proto3"; + +package greeter; +option go_package = "/proto;greeter"; + +service Greeter { + rpc Hello(Request) returns (Response) {} +} + +message Request { + string name = 1; +} + +message Response { + string msg = 1; +} +``` + +Generate the code + +``` +protoc --proto_path=. --micro_out=. --go_out=. greeter.proto +``` + +Your output result should be: + +``` +./ + greeter.proto # original protobuf file + greeter.pb.go # auto-generated by protoc-gen-go + greeter.micro.go # auto-generated by protoc-gen-micro +``` + +The micro generated code includes clients and handlers which reduce boiler plate code + +### Server + +Register the handler with your micro server + +```go +type Greeter struct{} + +func (g *Greeter) Hello(ctx context.Context, req *proto.Request, rsp *proto.Response) error { + rsp.Msg = "Hello " + req.Name + return nil +} + +proto.RegisterGreeterHandler(service.Server(), &Greeter{}) +``` + +### Client + +Create a service client with your micro client + +```go +client := proto.NewGreeterService("greeter", service.Client()) +``` + +### Errors + +If you see an error about `protoc-gen-micro` not being found or executable, it's likely your environment may not be configured correctly. If you've already installed `protoc`, `protoc-gen-go`, and `protoc-gen-micro` ensure you've included `$GOPATH/bin` in your `PATH`. + +Alternative specify the Go plugin paths as arguments to the `protoc` command + +``` +protoc --plugin=protoc-gen-go=$GOPATH/bin/protoc-gen-go --plugin=protoc-gen-micro=$GOPATH/bin/protoc-gen-micro --proto_path=. --micro_out=. --go_out=. greeter.proto +``` + +### Endpoint + +Add a micro API endpoint which routes directly to an RPC method + +Usage: + +1. Clone `github.com/googleapis/googleapis` to use this feature as it requires http annotations. +2. The protoc command must include `-I$GOPATH/src/github.com/googleapis/googleapis` for the annotations import. + +```diff +syntax = "proto3"; + +package greeter; +option go_package = "/proto;greeter"; + +import "google/api/annotations.proto"; + +service Greeter { + rpc Hello(Request) returns (Response) { + option (google.api.http) = { post: "/hello"; body: "*"; }; + } +} + +message Request { + string name = 1; +} + +message Response { + string msg = 1; +} +``` + +The proto generates a `RegisterGreeterHandler` function with a [api.Endpoint](https://godoc.org/go-micro.dev/v3/api#Endpoint). + +```diff +func RegisterGreeterHandler(s server.Server, hdlr GreeterHandler, opts ...server.HandlerOption) error { + type greeter interface { + Hello(ctx context.Context, in *Request, out *Response) error + } + type Greeter struct { + greeter + } + h := &greeterHandler{hdlr} + opts = append(opts, api.WithEndpoint(&api.Endpoint{ + Name: "Greeter.Hello", + Path: []string{"/hello"}, + Method: []string{"POST"}, + Handler: "rpc", + })) + return s.Handle(s.NewHandler(&Greeter{h}, opts...)) +} +``` + +## LICENSE + +protoc-gen-micro is a liberal reuse of protoc-gen-go hence we maintain the original license diff --git a/cmd/protoc-gen-micro/examples/greeter/greeter.pb.go b/cmd/protoc-gen-micro/examples/greeter/greeter.pb.go new file mode 100644 index 0000000000..13a0bdd7b1 --- /dev/null +++ b/cmd/protoc-gen-micro/examples/greeter/greeter.pb.go @@ -0,0 +1,227 @@ +// Code generated by protoc-gen-go. DO NOT EDIT. +// versions: +// protoc-gen-go v1.27.1 +// protoc v3.15.6 +// source: greeter.proto + +package greeter + +import ( + _ "google.golang.org/genproto/googleapis/api/annotations" + protoreflect "google.golang.org/protobuf/reflect/protoreflect" + protoimpl "google.golang.org/protobuf/runtime/protoimpl" + reflect "reflect" + sync "sync" +) + +const ( + // Verify that this generated code is sufficiently up-to-date. + _ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion) + // Verify that runtime/protoimpl is sufficiently up-to-date. + _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20) +) + +type Request struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields + + Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"` + Msg *string `protobuf:"bytes,2,opt,name=msg,proto3,oneof" json:"msg,omitempty"` +} + +func (x *Request) Reset() { + *x = Request{} + if protoimpl.UnsafeEnabled { + mi := &file_greeter_proto_msgTypes[0] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *Request) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*Request) ProtoMessage() {} + +func (x *Request) ProtoReflect() protoreflect.Message { + mi := &file_greeter_proto_msgTypes[0] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use Request.ProtoReflect.Descriptor instead. +func (*Request) Descriptor() ([]byte, []int) { + return file_greeter_proto_rawDescGZIP(), []int{0} +} + +func (x *Request) GetName() string { + if x != nil { + return x.Name + } + return "" +} + +func (x *Request) GetMsg() string { + if x != nil && x.Msg != nil { + return *x.Msg + } + return "" +} + +type Response struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields + + Msg string `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"` +} + +func (x *Response) Reset() { + *x = Response{} + if protoimpl.UnsafeEnabled { + mi := &file_greeter_proto_msgTypes[1] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *Response) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*Response) ProtoMessage() {} + +func (x *Response) ProtoReflect() protoreflect.Message { + mi := &file_greeter_proto_msgTypes[1] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use Response.ProtoReflect.Descriptor instead. +func (*Response) Descriptor() ([]byte, []int) { + return file_greeter_proto_rawDescGZIP(), []int{1} +} + +func (x *Response) GetMsg() string { + if x != nil { + return x.Msg + } + return "" +} + +var File_greeter_proto protoreflect.FileDescriptor + +var file_greeter_proto_rawDesc = []byte{ + 0x0a, 0x0d, 0x67, 0x72, 0x65, 0x65, 0x74, 0x65, 0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, + 0x1c, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x61, 0x6e, 0x6e, 0x6f, + 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x3c, 0x0a, + 0x07, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, + 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x15, 0x0a, 0x03, + 0x6d, 0x73, 0x67, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x03, 0x6d, 0x73, 0x67, + 0x88, 0x01, 0x01, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x6d, 0x73, 0x67, 0x22, 0x1c, 0x0a, 0x08, 0x52, + 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x6d, 0x73, 0x67, 0x18, 0x01, + 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6d, 0x73, 0x67, 0x32, 0x6e, 0x0a, 0x07, 0x47, 0x72, 0x65, + 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file_greeter_proto_rawDescData = protoimpl.X.CompressGZIP(file_greeter_proto_rawDescData) + }) + return file_greeter_proto_rawDescData +} + +var file_greeter_proto_msgTypes = make([]protoimpl.MessageInfo, 2) +var file_greeter_proto_goTypes = []interface{}{ + (*Request)(nil), // 0: Request + (*Response)(nil), // 1: Response +} +var file_greeter_proto_depIdxs = []int32{ + 0, // 0: Greeter.Hello:input_type -> Request + 0, // 1: Greeter.Stream:input_type -> Request + 1, // 2: Greeter.Hello:output_type -> Response + 1, // 3: Greeter.Stream:output_type -> Response + 2, // [2:4] is the sub-list for method output_type + 0, // [0:2] is the sub-list for method input_type + 0, // [0:0] is the sub-list for extension type_name + 0, // [0:0] is the sub-list for extension extendee + 0, // [0:0] is the sub-list for field type_name +} + +func init() { file_greeter_proto_init() } +func file_greeter_proto_init() { + if File_greeter_proto != nil { + return + } + if !protoimpl.UnsafeEnabled { + file_greeter_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*Request); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } + file_greeter_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*Response); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } + } + file_greeter_proto_msgTypes[0].OneofWrappers = []interface{}{} + type x struct{} + out := protoimpl.TypeBuilder{ + File: protoimpl.DescBuilder{ + GoPackagePath: reflect.TypeOf(x{}).PkgPath(), + RawDescriptor: file_greeter_proto_rawDesc, + NumEnums: 0, + NumMessages: 2, + NumExtensions: 0, + NumServices: 1, + }, + GoTypes: file_greeter_proto_goTypes, + DependencyIndexes: file_greeter_proto_depIdxs, + MessageInfos: file_greeter_proto_msgTypes, + }.Build() + File_greeter_proto = out.File + file_greeter_proto_rawDesc = nil + file_greeter_proto_goTypes = nil + file_greeter_proto_depIdxs = nil +} diff --git a/cmd/protoc-gen-micro/examples/greeter/greeter.pb.micro.go b/cmd/protoc-gen-micro/examples/greeter/greeter.pb.micro.go new file mode 100644 index 0000000000..1cf67347d4 --- /dev/null +++ b/cmd/protoc-gen-micro/examples/greeter/greeter.pb.micro.go @@ -0,0 +1,214 @@ +// Code generated by protoc-gen-micro. DO NOT EDIT. +// source: greeter.proto + +package greeter + +import ( + fmt "fmt" + _ "google.golang.org/genproto/googleapis/api/annotations" + proto "google.golang.org/protobuf/proto" + math "math" +) + +import ( + context "context" + api "go-micro.dev/v5/api" + client "go-micro.dev/v5/client" + server "go-micro.dev/v5/server" +) + +// Reference imports to suppress errors if they are not otherwise used. +var _ = proto.Marshal +var _ = fmt.Errorf +var _ = math.Inf + +// Reference imports to suppress errors if they are not otherwise used. +var _ api.Endpoint +var _ context.Context +var _ client.Option +var _ server.Option + +// Api Endpoints for Greeter service + +func NewGreeterEndpoints() []*api.Endpoint { + return []*api.Endpoint{ + { + Name: "Greeter.Hello", + Path: []string{"/hello"}, + Method: []string{"POST"}, + Handler: "rpc", + }, + { + Name: "Greeter.Stream", + Path: []string{"/stream"}, + Method: []string{"GET"}, + Stream: true, + Handler: "rpc", + }, + } +} + +// Client API for Greeter service + +type GreeterService interface { + Hello(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error) + Stream(ctx context.Context, opts ...client.CallOption) (Greeter_StreamService, error) +} + +type greeterService struct { + c client.Client + name string +} + +func NewGreeterService(name string, c client.Client) GreeterService { + return &greeterService{ + c: c, + name: name, + } +} + +func (c *greeterService) Hello(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error) { + req := c.c.NewRequest(c.name, "Greeter.Hello", in) + out := new(Response) + err := c.c.Call(ctx, req, out, opts...) + if err != nil { + return nil, err + } + return out, nil +} + +func (c *greeterService) Stream(ctx context.Context, opts ...client.CallOption) (Greeter_StreamService, error) { + req := c.c.NewRequest(c.name, "Greeter.Stream", &Request{}) + stream, err := c.c.Stream(ctx, req, opts...) + if err != nil { + return nil, err + } + return &greeterServiceStream{stream}, nil +} + +type Greeter_StreamService interface { + Context() context.Context + SendMsg(interface{}) error + RecvMsg(interface{}) error + Close() error + Send(*Request) error + Recv() (*Response, error) +} + +type greeterServiceStream struct { + stream client.Stream +} + +func (x *greeterServiceStream) Close() error { + return x.stream.Close() +} + +func (x *greeterServiceStream) Context() context.Context { + return x.stream.Context() +} + +func (x *greeterServiceStream) SendMsg(m interface{}) error { + return x.stream.Send(m) +} + +func (x *greeterServiceStream) RecvMsg(m interface{}) error { + return x.stream.Recv(m) +} + +func (x *greeterServiceStream) Send(m *Request) error { + return x.stream.Send(m) +} + +func (x *greeterServiceStream) Recv() (*Response, error) { + m := new(Response) + err := x.stream.Recv(m) + if err != nil { + return nil, err + } + return m, nil +} + +// Server API for Greeter service + +type GreeterHandler interface { + Hello(context.Context, *Request, *Response) error + Stream(context.Context, Greeter_StreamStream) error +} + +func RegisterGreeterHandler(s server.Server, hdlr GreeterHandler, opts ...server.HandlerOption) error { + type greeter interface { + Hello(ctx context.Context, in *Request, out *Response) error + Stream(ctx context.Context, stream server.Stream) error + } + type Greeter struct { + greeter + } + h := &greeterHandler{hdlr} + opts = append(opts, api.WithEndpoint(&api.Endpoint{ + Name: "Greeter.Hello", + Path: []string{"/hello"}, + Method: []string{"POST"}, + Handler: "rpc", + })) + opts = append(opts, api.WithEndpoint(&api.Endpoint{ + Name: "Greeter.Stream", + Path: []string{"/stream"}, + Method: []string{"GET"}, + Stream: true, + Handler: "rpc", + })) + return s.Handle(s.NewHandler(&Greeter{h}, opts...)) +} + +type greeterHandler struct { + GreeterHandler +} + +func (h *greeterHandler) Hello(ctx context.Context, in *Request, out *Response) error { + return h.GreeterHandler.Hello(ctx, in, out) +} + +func (h *greeterHandler) Stream(ctx context.Context, stream server.Stream) error { + return h.GreeterHandler.Stream(ctx, &greeterStreamStream{stream}) +} + +type Greeter_StreamStream interface { + Context() context.Context + SendMsg(interface{}) error + RecvMsg(interface{}) error + Close() error + Send(*Response) error + Recv() (*Request, error) +} + +type greeterStreamStream struct { + stream server.Stream +} + +func (x *greeterStreamStream) Close() error { + return x.stream.Close() +} + +func (x *greeterStreamStream) Context() context.Context { + return x.stream.Context() +} + +func (x *greeterStreamStream) SendMsg(m interface{}) error { + return x.stream.Send(m) +} + +func (x *greeterStreamStream) RecvMsg(m interface{}) error { + return x.stream.Recv(m) +} + +func (x *greeterStreamStream) Send(m *Response) error { + return x.stream.Send(m) +} + +func (x *greeterStreamStream) Recv() (*Request, error) { + m := new(Request) + if err := x.stream.Recv(m); err != nil { + return nil, err + } + return m, nil +} diff --git a/cmd/protoc-gen-micro/examples/greeter/greeter.proto b/cmd/protoc-gen-micro/examples/greeter/greeter.proto new file mode 100644 index 0000000000..3f7446104c --- /dev/null +++ b/cmd/protoc-gen-micro/examples/greeter/greeter.proto @@ -0,0 +1,23 @@ +syntax = "proto3"; + +option go_package = "../greeter"; + +import "google/api/annotations.proto"; + +service Greeter { + rpc Hello(Request) returns (Response) { + option (google.api.http) = { post: "/hello"; body: "*"; }; + } + rpc Stream(stream Request) returns (stream Response) { + option (google.api.http) = { get: "/stream"; }; + } +} + +message Request { + string name = 1; + optional string msg = 2; +} + +message Response { + string msg = 1; +} diff --git a/cmd/protoc-gen-micro/generator/Makefile b/cmd/protoc-gen-micro/generator/Makefile new file mode 100644 index 0000000000..a1f1a354e2 --- /dev/null +++ b/cmd/protoc-gen-micro/generator/Makefile @@ -0,0 +1,40 @@ +# Go support for Protocol Buffers - Google's data interchange format +# +# 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. + +include $(GOROOT)/src/Make.inc + +TARG=github.com/golang/protobuf/protoc-gen-go/generator +GOFILES=\ + generator.go\ + +DEPS=../descriptor ../plugin ../../proto + +include $(GOROOT)/src/Make.pkg diff --git a/cmd/protoc-gen-micro/generator/generator.go b/cmd/protoc-gen-micro/generator/generator.go new file mode 100644 index 0000000000..22015dc3ea --- /dev/null +++ b/cmd/protoc-gen-micro/generator/generator.go @@ -0,0 +1,2746 @@ +// Go support for Protocol Buffers - Google's data interchange format +// +// Copyright 2010 The Go Authors. All rights reserved. +// https://google.golang.org/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. + +/* + The code generator for the plugin for the Google protocol buffer compiler. + It generates Go code from the protocol buffer description files read by the + main routine. +*/ +package generator + +import ( + "bufio" + "bytes" + "compress/gzip" + "crypto/sha256" + "encoding/hex" + "fmt" + "go/ast" + "go/build" + "go/parser" + "go/printer" + "go/token" + "log" + "os" + "path" + "sort" + "strconv" + "strings" + "unicode" + "unicode/utf8" + + "google.golang.org/protobuf/proto" + descriptor "google.golang.org/protobuf/types/descriptorpb" + plugin "google.golang.org/protobuf/types/pluginpb" +) + +// SupportedFeatures used to signaling that code generator supports proto3 optional +// https://github.com/protocolbuffers/protobuf/blob/master/docs/implementing_proto3_presence.md#signaling-that-your-code-generator-supports-proto3-optional +var SupportedFeatures = uint64(plugin.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL) + +// A Plugin provides functionality to add to the output during Go code generation, +// such as to produce RPC stubs. +type Plugin interface { + // Name identifies the plugin. + Name() string + // Init is called once after data structures are built but before + // code generation begins. + Init(g *Generator) + // Generate produces the code generated by the plugin for this file, + // except for the imports, by calling the generator's methods P, In, and Out. + Generate(file *FileDescriptor) + // GenerateImports produces the import declarations for this file. + // It is called after Generate. + GenerateImports(file *FileDescriptor, imports map[GoImportPath]GoPackageName) +} + +var plugins []Plugin + +// RegisterPlugin installs a (second-order) plugin to be run when the Go output is generated. +// It is typically called during initialization. +func RegisterPlugin(p Plugin) { + plugins = append(plugins, p) +} + +// A GoImportPath is the import path of a Go package. e.g., "google.golang.org/genproto/protobuf". +type GoImportPath string + +func (p GoImportPath) String() string { return strconv.Quote(string(p)) } + +// A GoPackageName is the name of a Go package. e.g., "protobuf". +type GoPackageName string + +// 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. + +// The file and package name method are common to messages and enums. +type common struct { + file *FileDescriptor // File this object comes from. +} + +// GoImportPath is the import path of the Go package containing the type. +func (c *common) GoImportPath() GoImportPath { + return c.file.importPath +} + +func (c *common) File() *FileDescriptor { return c.file } + +func fileIsProto3(file *descriptor.FileDescriptorProto) bool { + return file.GetSyntax() == "proto3" +} + +func (c *common) proto3() bool { return fileIsProto3(c.file.FileDescriptorProto) } + +// 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 +} + +// 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) + 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. +} + +// 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 CamelCase(*e.Name) + "_" + } + typeName := e.TypeName() + return 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. +} + +// 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] = CamelCase(s) + } + return "E_" + strings.Join(typeName, "_") +} + +// ImportedDescriptor describes a type that has been publicly imported from another file. +type ImportedDescriptor struct { + common + o Object +} + +func (id *ImportedDescriptor) TypeName() []string { return id.o.TypeName() } + +// 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 + desc []*Descriptor // All the messages defined in this file. + enum []*EnumDescriptor // All the enums defined in this file. + ext []*ExtensionDescriptor // All the top-level extensions defined in this file. + imp []*ImportedDescriptor // All types defined in files publicly imported by this file. + + // Comments, stored as a map of path (comma-separated integers) to the comment. + comments map[string]*descriptor.SourceCodeInfo_Location + + // The full list of symbols that are exported, + // as a map from the exported object to its symbols. + // This is used for supporting public imports. + exported map[Object][]symbol + + importPath GoImportPath // Import path of this file's package. + packageName GoPackageName // Name of this file's Go package. + + proto3 bool // whether to generate proto3 code for this file +} + +// VarName is the variable name we'll use in the generated code to refer +// to the compressed bytes of this descriptor. It is not exported, so +// it is only valid inside the generated package. +func (d *FileDescriptor) VarName() string { + h := sha256.Sum256([]byte(d.GetName())) + return fmt.Sprintf("fileDescriptor_%s", hex.EncodeToString(h[:8])) +} + +// goPackageOption interprets the file's go_package option. +// If there is no go_package, it returns ("", "", false). +// If there's a simple name, it returns ("", pkg, true). +// If the option implies an import path, it returns (impPath, pkg, true). +func (d *FileDescriptor) goPackageOption() (impPath GoImportPath, pkg GoPackageName, ok bool) { + opt := d.GetOptions().GetGoPackage() + if opt == "" { + return "", "", false + } + // A semicolon-delimited suffix delimits the import path and package name. + sc := strings.Index(opt, ";") + if sc >= 0 { + return GoImportPath(opt[:sc]), cleanPackageName(opt[sc+1:]), true + } + // The presence of a slash implies there's an import path. + slash := strings.LastIndex(opt, "/") + if slash >= 0 { + return GoImportPath(opt), cleanPackageName(opt[slash+1:]), true + } + return "", cleanPackageName(opt), true +} + +// goFileName returns the output name for the generated Go file. +func (d *FileDescriptor) goFileName(pathType pathType, moduleRoot string) string { + name := *d.Name + if ext := path.Ext(name); ext == ".proto" || ext == ".protodevel" { + name = name[:len(name)-len(ext)] + } + name += ".pb.micro.go" + + if pathType == pathTypeSourceRelative { + return name + } + + // Does the file have a "go_package" option? + // If it does, it may override the filename. + if impPath, _, ok := d.goPackageOption(); ok && impPath != "" { + if pathType == pathModuleRoot && moduleRoot != "" { + root := moduleRoot + if !strings.HasSuffix(root, "/") { + root = root + "/" + } + name = strings.TrimPrefix(name, root) + } else { + // Replace the existing dirname with the declared import path. + _, name = path.Split(name) + name = path.Join(string(impPath), name) + } + + return name + } + + return name +} + +func (d *FileDescriptor) addExport(obj Object, sym symbol) { + d.exported[obj] = append(d.exported[obj], sym) +} + +// symbol is an interface representing an exported Go symbol. +type symbol interface { + // GenerateAlias should generate an appropriate alias + // for the symbol from the named package. + GenerateAlias(g *Generator, filename string, pkg GoPackageName) +} + +type messageSymbol struct { + sym string + hasExtensions, isMessageSet bool + oneofTypes []string +} + +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) +} + +func (ms *messageSymbol) GenerateAlias(g *Generator, filename string, pkg GoPackageName) { + g.P("// ", ms.sym, " from public import ", filename) + g.P("type ", ms.sym, " = ", pkg, ".", ms.sym) + for _, name := range ms.oneofTypes { + g.P("type ", name, " = ", pkg, ".", name) + } +} + +type enumSymbol struct { + name string + proto3 bool // Whether this came from a proto3 file. +} + +func (es enumSymbol) GenerateAlias(g *Generator, filename string, pkg GoPackageName) { + s := es.name + g.P("// ", s, " from public import ", filename) + g.P("type ", s, " = ", pkg, ".", s) + g.P("var ", s, "_name = ", pkg, ".", s, "_name") + g.P("var ", s, "_value = ", pkg, ".", s, "_value") +} + +type constOrVarSymbol struct { + sym string + typ string // either "const" or "var" + cast string // if non-empty, a type cast is required (used for enums) +} + +func (cs constOrVarSymbol) GenerateAlias(g *Generator, filename string, pkg GoPackageName) { + v := string(pkg) + "." + cs.sym + if cs.cast != "" { + v = cs.cast + "(" + v + ")" + } + g.P(cs.typ, " ", cs.sym, " = ", v) +} + +// Object is an interface abstracting the abilities shared by enums, messages, extensions and imported objects. +type Object interface { + GoImportPath() GoImportPath + TypeName() []string + File() *FileDescriptor +} + +// Generator is the type whose methods generate the output, stored in the associated response structure. +type Generator struct { + *bytes.Buffer + + Request *plugin.CodeGeneratorRequest // The input. + Response *plugin.CodeGeneratorResponse // The output. + + Param map[string]string // Command-line parameters. + PackageImportPath string // Go import path of the package we're generating code for + ImportPrefix string // String to prefix to imported package file names. + ImportMap map[string]string // Mapping from .proto file name to import path + ModuleRoot string // Mapping from the module prefix + + Pkg map[string]string // The names under which we import support packages + + outputImportPath GoImportPath // Package we're generating code for. + allFiles []*FileDescriptor // All files in the tree + allFilesByName map[string]*FileDescriptor // All files by filename. + genFiles []*FileDescriptor // Those files we will generate output for. + file *FileDescriptor // The file we are compiling now. + packageNames map[GoImportPath]GoPackageName // Imported package names in the current file. + usedPackages map[GoImportPath]bool // Packages used in current file. + usedPackageNames map[GoPackageName]bool // Package names used in the current file. + addedImports map[GoImportPath]bool // Additional imports to emit. + typeNameToObject map[string]Object // Key is a fully-qualified name in input syntax. + init []string // Lines to emit in the init function. + indent string + pathType pathType // How to generate output filenames. + writeOutput bool +} + +type pathType int + +const ( + pathTypeImport pathType = iota + pathTypeSourceRelative + pathModuleRoot +) + +// New creates a new generator and allocates the request and response protobufs. +func New() *Generator { + g := new(Generator) + g.Buffer = new(bytes.Buffer) + g.Request = new(plugin.CodeGeneratorRequest) + g.Response = new(plugin.CodeGeneratorResponse) + return g +} + +// Error reports a problem, including an error, and exits the program. +func (g *Generator) Error(err error, msgs ...string) { + s := strings.Join(msgs, " ") + ":" + err.Error() + log.Print("protoc-gen-micro: error:", s) + os.Exit(1) +} + +// Fail reports a problem and exits the program. +func (g *Generator) Fail(msgs ...string) { + s := strings.Join(msgs, " ") + log.Print("protoc-gen-micro: error:", s) + os.Exit(1) +} + +// CommandLineParameters breaks the comma-separated list of key=value pairs +// in the parameter (a member of the request protobuf) into a key/value map. +// It then sets file name mappings defined by those entries. +func (g *Generator) CommandLineParameters(parameter string) { + g.Param = make(map[string]string) + for _, p := range strings.Split(parameter, ",") { + if i := strings.Index(p, "="); i < 0 { + g.Param[p] = "" + } else { + g.Param[p[0:i]] = p[i+1:] + } + } + + g.ImportMap = make(map[string]string) + pluginList := "none" // Default list of plugin names to enable (empty means all). + for k, v := range g.Param { + switch k { + case "import_prefix": + g.ImportPrefix = v + case "import_path": + g.PackageImportPath = v + case "module": + if g.pathType == pathTypeSourceRelative { + g.Fail(fmt.Sprintf(`Cannot set module=%q after paths=source_relative`, v)) + } + g.pathType = pathModuleRoot + g.ModuleRoot = v + case "paths": + switch v { + case "import": + g.pathType = pathTypeImport + case "source_relative": + if g.pathType == pathModuleRoot { + g.Fail("Cannot set paths=source_relative after setting module=") + } + g.pathType = pathTypeSourceRelative + default: + g.Fail(fmt.Sprintf(`Unknown path type %q: want "import" or "source_relative".`, v)) + } + case "plugins": + pluginList = v + default: + if len(k) > 0 && k[0] == 'M' { + g.ImportMap[k[1:]] = v + } + } + } + if pluginList != "" { + // Amend the set of plugins. + enabled := map[string]bool{ + "micro": true, + } + for _, name := range strings.Split(pluginList, "+") { + enabled[name] = true + } + var nplugins []Plugin + for _, p := range plugins { + if enabled[p.Name()] { + nplugins = append(nplugins, p) + } + } + plugins = nplugins + } +} + +// DefaultPackageName returns the package name printed for the object. +// If its file is in a different package, it returns the package name we're using for this file, plus ".". +// Otherwise it returns the empty string. +func (g *Generator) DefaultPackageName(obj Object) string { + importPath := obj.GoImportPath() + if importPath == g.outputImportPath { + return "" + } + return string(g.GoPackageName(importPath)) + "." +} + +// GoPackageName returns the name used for a package. +func (g *Generator) GoPackageName(importPath GoImportPath) GoPackageName { + if name, ok := g.packageNames[importPath]; ok { + return name + } + name := cleanPackageName(baseName(string(importPath))) + for i, orig := 1, name; g.usedPackageNames[name] || isGoPredeclaredIdentifier[string(name)]; i++ { + name = orig + GoPackageName(strconv.Itoa(i)) + } + g.packageNames[importPath] = name + g.usedPackageNames[name] = true + return name +} + +// AddImport adds a package to the generated file's import section. +// It returns the name used for the package. +func (g *Generator) AddImport(importPath GoImportPath) GoPackageName { + g.addedImports[importPath] = true + return g.GoPackageName(importPath) +} + +var globalPackageNames = map[GoPackageName]bool{ + "fmt": true, + "math": true, + "proto": true, +} + +// Create and remember a guaranteed unique package name. Pkg is the candidate name. +// The FileDescriptor parameter is unused. +func RegisterUniquePackageName(pkg string, f *FileDescriptor) string { + name := cleanPackageName(pkg) + for i, orig := 1, name; globalPackageNames[name]; i++ { + name = orig + GoPackageName(strconv.Itoa(i)) + } + globalPackageNames[name] = true + return string(name) +} + +var isGoKeyword = map[string]bool{ + "break": true, + "case": true, + "chan": true, + "const": true, + "continue": true, + "default": true, + "else": true, + "defer": true, + "fallthrough": true, + "for": true, + "func": true, + "go": true, + "goto": true, + "if": true, + "import": true, + "interface": true, + "map": true, + "package": true, + "range": true, + "return": true, + "select": true, + "struct": true, + "switch": true, + "type": true, + "var": true, +} + +var isGoPredeclaredIdentifier = map[string]bool{ + "append": true, + "bool": true, + "byte": true, + "cap": true, + "close": true, + "complex": true, + "complex128": true, + "complex64": true, + "copy": true, + "delete": true, + "error": true, + "false": true, + "float32": true, + "float64": true, + "imag": true, + "int": true, + "int16": true, + "int32": true, + "int64": true, + "int8": true, + "iota": true, + "len": true, + "make": true, + "new": true, + "nil": true, + "panic": true, + "print": true, + "println": true, + "real": true, + "recover": true, + "rune": true, + "string": true, + "true": true, + "uint": true, + "uint16": true, + "uint32": true, + "uint64": true, + "uint8": true, + "uintptr": true, +} + +func cleanPackageName(name string) GoPackageName { + name = strings.Map(badToUnderscore, name) + // Identifier must not be keyword or predeclared identifier: insert _. + if isGoKeyword[name] { + name = "_" + name + } + // Identifier must not begin with digit: insert _. + if r, _ := utf8.DecodeRuneInString(name); unicode.IsDigit(r) { + name = "_" + name + } + return GoPackageName(name) +} + +// defaultGoPackage returns the package name to use, +// derived from the import path of the package we're building code for. +func (g *Generator) defaultGoPackage() GoPackageName { + p := g.PackageImportPath + if i := strings.LastIndex(p, "/"); i >= 0 { + p = p[i+1:] + } + return cleanPackageName(p) +} + +// SetPackageNames sets the package name for this run. +// The package name must agree across all files being generated. +// It also defines unique package names for all imported files. +func (g *Generator) SetPackageNames() { + g.outputImportPath = g.genFiles[0].importPath + + defaultPackageNames := make(map[GoImportPath]GoPackageName) + for _, f := range g.genFiles { + if _, p, ok := f.goPackageOption(); ok { + defaultPackageNames[f.importPath] = p + } + } + for _, f := range g.genFiles { + if _, p, ok := f.goPackageOption(); ok { + // Source file: option go_package = "quux/bar"; + f.packageName = p + } else if p, ok := defaultPackageNames[f.importPath]; ok { + // A go_package option in another file in the same package. + // + // This is a poor choice in general, since every source file should + // contain a go_package option. Supported mainly for historical + // compatibility. + f.packageName = p + } else if p := g.defaultGoPackage(); p != "" { + // Command-line: import_path=quux/bar. + // + // The import_path flag sets a package name for files which don't + // contain a go_package option. + f.packageName = p + } else if p := f.GetPackage(); p != "" { + // Source file: package quux.bar; + f.packageName = cleanPackageName(p) + } else { + // Source filename. + f.packageName = cleanPackageName(baseName(f.GetName())) + } + } + + // Check that all files have a consistent package name and import path. + for _, f := range g.genFiles[1:] { + if a, b := g.genFiles[0].importPath, f.importPath; a != b { + g.Fail(fmt.Sprintf("inconsistent package import paths: %v, %v", a, b)) + } + if a, b := g.genFiles[0].packageName, f.packageName; a != b { + g.Fail(fmt.Sprintf("inconsistent package names: %v, %v", a, b)) + } + } + + // Names of support packages. These never vary (if there are conflicts, + // we rename the conflicting package), so this could be removed someday. + g.Pkg = map[string]string{ + "fmt": "fmt", + "math": "math", + "proto": "proto", + } +} + +// 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 (g *Generator) WrapTypes() { + g.allFiles = make([]*FileDescriptor, 0, len(g.Request.ProtoFile)) + g.allFilesByName = make(map[string]*FileDescriptor, len(g.allFiles)) + genFileNames := make(map[string]bool) + for _, n := range g.Request.FileToGenerate { + genFileNames[n] = true + } + for _, f := range g.Request.ProtoFile { + fd := &FileDescriptor{ + FileDescriptorProto: f, + exported: make(map[Object][]symbol), + proto3: fileIsProto3(f), + } + // The import path may be set in a number of ways. + if substitution, ok := g.ImportMap[f.GetName()]; ok { + // Command-line: M=foo.proto=quux/bar. + // + // Explicit mapping of source file to import path. + fd.importPath = GoImportPath(substitution) + } else if genFileNames[f.GetName()] && g.PackageImportPath != "" { + // Command-line: import_path=quux/bar. + // + // The import_path flag sets the import path for every file that + // we generate code for. + fd.importPath = GoImportPath(g.PackageImportPath) + } else if p, _, _ := fd.goPackageOption(); p != "" { + // Source file: option go_package = "quux/bar"; + // + // The go_package option sets the import path. Most users should use this. + fd.importPath = p + } else { + // Source filename. + // + // Last resort when nothing else is available. + fd.importPath = GoImportPath(path.Dir(f.GetName())) + } + // We must wrap the descriptors before we wrap the enums + fd.desc = wrapDescriptors(fd) + g.buildNestedDescriptors(fd.desc) + fd.enum = wrapEnumDescriptors(fd, fd.desc) + g.buildNestedEnums(fd.desc, fd.enum) + fd.ext = wrapExtensions(fd) + extractComments(fd) + g.allFiles = append(g.allFiles, fd) + g.allFilesByName[f.GetName()] = fd + } + for _, fd := range g.allFiles { + fd.imp = wrapImported(fd, g) + } + + g.genFiles = make([]*FileDescriptor, 0, len(g.Request.FileToGenerate)) + for _, fileName := range g.Request.FileToGenerate { + fd := g.allFilesByName[fileName] + if fd == nil { + g.Fail("could not find file named", fileName) + } + g.genFiles = append(g.genFiles, fd) + } +} + +// Scan the descriptors in this file. For each one, build the slice of nested descriptors +func (g *Generator) 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) { + g.Fail("internal error: nesting failure for", desc.GetName()) + } + } + } +} + +func (g *Generator) 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) { + g.Fail("internal error: enum nesting failure for", desc.GetName()) + } + } + } +} + +// Construct the Descriptor +func newDescriptor(desc *descriptor.DescriptorProto, parent *Descriptor, file *FileDescriptor, 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 *FileDescriptor) []*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 *FileDescriptor, 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 +} + +// Construct the EnumDescriptor +func newEnumDescriptor(desc *descriptor.EnumDescriptorProto, parent *Descriptor, file *FileDescriptor, 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 *FileDescriptor, 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 +} + +// Return a slice of all the top-level ExtensionDescriptors defined within this file. +func wrapExtensions(file *FileDescriptor) []*ExtensionDescriptor { + var sl []*ExtensionDescriptor + for _, field := range file.Extension { + sl = append(sl, &ExtensionDescriptor{common{file}, field, nil}) + } + return sl +} + +// Return a slice of all the types that are publicly imported into this file. +func wrapImported(file *FileDescriptor, g *Generator) (sl []*ImportedDescriptor) { + for _, index := range file.PublicDependency { + df := g.fileByName(file.Dependency[index]) + for _, d := range df.desc { + if d.GetOptions().GetMapEntry() { + continue + } + sl = append(sl, &ImportedDescriptor{common{file}, d}) + } + for _, e := range df.enum { + sl = append(sl, &ImportedDescriptor{common{file}, e}) + } + for _, ext := range df.ext { + sl = append(sl, &ImportedDescriptor{common{file}, ext}) + } + } + return +} + +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 + } +} + +// BuildTypeNameMap builds the map from fully qualified type names to objects. +// The key names for the map come from the input data, which puts a period at the beginning. +// It should be called after SetPackageNames and before GenerateAllFiles. +func (g *Generator) BuildTypeNameMap() { + g.typeNameToObject = make(map[string]Object) + for _, f := range g.allFiles { + // The names in this loop are defined by the proto world, not us, so the + // package name may be empty. If so, the dotted package name of X will + // be ".X"; otherwise it will be ".pkg.X". + dottedPkg := "." + f.GetPackage() + if dottedPkg != "." { + dottedPkg += "." + } + for _, enum := range f.enum { + name := dottedPkg + dottedSlice(enum.TypeName()) + g.typeNameToObject[name] = enum + } + for _, desc := range f.desc { + name := dottedPkg + dottedSlice(desc.TypeName()) + g.typeNameToObject[name] = desc + } + } +} + +// ObjectNamed, given a fully-qualified input type name as it appears in the input data, +// returns the descriptor for the message or enum with that name. +func (g *Generator) ObjectNamed(typeName string) Object { + o, ok := g.typeNameToObject[typeName] + if !ok { + g.Fail("can't find object with type", typeName) + } + return o +} + +// AnnotatedAtoms is a list of atoms (as consumed by P) that records the file name and proto AST path from which they originated. +type AnnotatedAtoms struct { + source string + path string + atoms []interface{} +} + +// Annotate records the file name and proto AST path of a list of atoms +// so that a later call to P can emit a link from each atom to its origin. +func Annotate(file *FileDescriptor, path string, atoms ...interface{}) *AnnotatedAtoms { + return &AnnotatedAtoms{source: *file.Name, path: path, atoms: atoms} +} + +// printAtom prints the (atomic, non-annotation) argument to the generated output. +func (g *Generator) printAtom(v interface{}) { + switch v := v.(type) { + case string: + g.WriteString(v) + case *string: + g.WriteString(*v) + case bool: + fmt.Fprint(g, v) + case *bool: + fmt.Fprint(g, *v) + case int: + fmt.Fprint(g, v) + case *int32: + fmt.Fprint(g, *v) + case *int64: + fmt.Fprint(g, *v) + case float64: + fmt.Fprint(g, v) + case *float64: + fmt.Fprint(g, *v) + case GoPackageName: + g.WriteString(string(v)) + case GoImportPath: + g.WriteString(strconv.Quote(string(v))) + default: + g.Fail(fmt.Sprintf("unknown type in printer: %T", v)) + } +} + +// P prints the arguments to the generated output. It handles strings and int32s, plus +// handling indirections because they may be *string, etc. Any inputs of type AnnotatedAtoms may emit +// annotations in a .meta file in addition to outputting the atoms themselves (if g.annotateCode +// is true). +func (g *Generator) P(str ...interface{}) { + if !g.writeOutput { + return + } + g.WriteString(g.indent) + for _, v := range str { + switch v := v.(type) { + case *AnnotatedAtoms: + for _, v := range v.atoms { + g.printAtom(v) + } + default: + g.printAtom(v) + } + } + g.WriteByte('\n') +} + +// addInitf stores the given statement to be printed inside the file's init function. +// The statement is given as a format specifier and arguments. +func (g *Generator) addInitf(stmt string, a ...interface{}) { + g.init = append(g.init, fmt.Sprintf(stmt, a...)) +} + +// In Indents the output one tab stop. +func (g *Generator) In() { g.indent += "\t" } + +// Out unindents the output one tab stop. +func (g *Generator) Out() { + if len(g.indent) > 0 { + g.indent = g.indent[1:] + } +} + +// GenerateAllFiles generates the output for all the files we're outputting. +func (g *Generator) GenerateAllFiles() { + // Initialize the plugins + for _, p := range plugins { + p.Init(g) + } + // Generate the output. The generator runs for every file, even the files + // that we don't generate output for, so that we can collate the full list + // of exported symbols to support public imports. + genFileMap := make(map[*FileDescriptor]bool, len(g.genFiles)) + for _, file := range g.genFiles { + genFileMap[file] = true + } + for _, file := range g.allFiles { + g.Reset() + g.writeOutput = genFileMap[file] + g.generate(file) + if !g.writeOutput { + continue + } + fname := file.goFileName(g.pathType, g.ModuleRoot) + g.Response.File = append(g.Response.File, &plugin.CodeGeneratorResponse_File{ + Name: proto.String(fname), + Content: proto.String(g.String()), + }) + } + g.Response.SupportedFeatures = proto.Uint64(SupportedFeatures) +} + +// Run all the plugins associated with the file. +func (g *Generator) runPlugins(file *FileDescriptor) { + for _, p := range plugins { + p.Generate(file) + } +} + +// Fill the response protocol buffer with the generated output for all the files we're +// supposed to generate. +func (g *Generator) generate(file *FileDescriptor) { + g.file = file + g.usedPackages = make(map[GoImportPath]bool) + g.packageNames = make(map[GoImportPath]GoPackageName) + g.usedPackageNames = make(map[GoPackageName]bool) + g.addedImports = make(map[GoImportPath]bool) + for name := range globalPackageNames { + g.usedPackageNames[name] = true + } + + for _, td := range g.file.imp { + g.generateImported(td) + } + + g.generateInitFunction() + + // Run the plugins before the imports so we know which imports are necessary. + g.runPlugins(file) + + // Generate header and imports last, though they appear first in the output. + rem := g.Buffer + g.Buffer = new(bytes.Buffer) + g.generateHeader() + g.generateImports() + if !g.writeOutput { + return + } + g.Write(rem.Bytes()) + + // Reformat generated code and patch annotation locations. + fset := token.NewFileSet() + original := g.Bytes() + fileAST, err := parser.ParseFile(fset, "", original, parser.ParseComments) + if err != nil { + // Print out the bad code with line numbers. + // This should never happen in practice, but it can while changing generated code, + // so consider this a debugging aid. + var src bytes.Buffer + s := bufio.NewScanner(bytes.NewReader(original)) + for line := 1; s.Scan(); line++ { + fmt.Fprintf(&src, "%5d\t%s\n", line, s.Bytes()) + } + g.Fail("bad Go source code was generated:", err.Error(), "\n"+src.String()) + } + ast.SortImports(fset, fileAST) + g.Reset() + err = (&printer.Config{Mode: printer.TabIndent | printer.UseSpaces, Tabwidth: 8}).Fprint(g, fset, fileAST) + if err != nil { + g.Fail("generated Go source code could not be reformatted:", err.Error()) + } +} + +// Generate the header, including package definition +func (g *Generator) generateHeader() { + g.P("// Code generated by protoc-gen-micro. DO NOT EDIT.") + if g.file.GetOptions().GetDeprecated() { + g.P("// ", g.file.Name, " is a deprecated file.") + } else { + g.P("// source: ", g.file.Name) + } + g.P() + g.PrintComments(strconv.Itoa(packagePath)) + g.P() + g.P("package ", g.file.packageName) + g.P() +} + +// deprecationComment is the standard comment added to deprecated +// messages, fields, enums, and enum values. +var deprecationComment = "// Deprecated: Do not use." + +// PrintComments prints any comments from the source .proto file. +// The path is a comma-separated list of integers. +// It returns an indication of whether any comments were printed. +// See descriptor.proto for its format. +func (g *Generator) PrintComments(path string) bool { + if !g.writeOutput { + return false + } + if c, ok := g.makeComments(path); ok { + g.P(c) + return true + } + return false +} + +// makeComments generates the comment string for the field, no "\n" at the end +func (g *Generator) makeComments(path string) (string, bool) { + loc, ok := g.file.comments[path] + if !ok { + return "", false + } + w := new(bytes.Buffer) + nl := "" + for _, line := range strings.Split(strings.TrimSuffix(loc.GetLeadingComments(), "\n"), "\n") { + fmt.Fprintf(w, "%s//%s", nl, line) + nl = "\n" + } + return w.String(), true +} + +func (g *Generator) fileByName(filename string) *FileDescriptor { + return g.allFilesByName[filename] +} + +// weak returns whether the ith import of the current file is a weak import. +func (g *Generator) weak(i int32) bool { + for _, j := range g.file.WeakDependency { + if j == i { + return true + } + } + return false +} + +// Generate the imports +func (g *Generator) generateImports() { + imports := make(map[GoImportPath]GoPackageName) + for i, s := range g.file.Dependency { + fd := g.fileByName(s) + importPath := fd.importPath + // Do not import our own package. + if importPath == g.file.importPath { + continue + } + // Do not import weak imports. + if g.weak(int32(i)) { + continue + } + // Do not import a package twice. + if _, ok := imports[importPath]; ok { + continue + } + // We need to import all the dependencies, even if we don't reference them, + // because other code and tools depend on having the full transitive closure + // of protocol buffer types in the binary. + packageName := g.GoPackageName(importPath) + if _, ok := g.usedPackages[importPath]; !ok { + packageName = "_" + } + imports[importPath] = packageName + } + for importPath := range g.addedImports { + imports[importPath] = g.GoPackageName(importPath) + } + // We almost always need a proto import. Rather than computing when we + // do, which is tricky when there's a plugin, just import it and + // reference it later. The same argument applies to the fmt and math packages. + g.P("import (") + g.P(g.Pkg["fmt"] + ` "fmt"`) + g.P(g.Pkg["math"] + ` "math"`) + g.P(g.Pkg["proto"]+" ", GoImportPath(g.ImportPrefix)+"google.golang.org/protobuf/proto") + for importPath, packageName := range imports { + g.P(packageName, " ", GoImportPath(g.ImportPrefix)+importPath) + } + g.P(")") + g.P() + // TODO: may need to worry about uniqueness across plugins + for _, p := range plugins { + p.GenerateImports(g.file, imports) + g.P() + } + g.P("// Reference imports to suppress errors if they are not otherwise used.") + g.P("var _ = ", g.Pkg["proto"], ".Marshal") + g.P("var _ = ", g.Pkg["fmt"], ".Errorf") + g.P("var _ = ", g.Pkg["math"], ".Inf") + g.P() +} + +func (g *Generator) generateImported(id *ImportedDescriptor) { + df := id.o.File() + filename := *df.Name + if df.importPath == g.file.importPath { + // Don't generate type aliases for files in the same Go package as this one. + return + } + if !supportTypeAliases { + g.Fail(fmt.Sprintf("%s: public imports require at least go1.9", filename)) + } + g.usedPackages[df.importPath] = true + + for _, sym := range df.exported[id.o] { + sym.GenerateAlias(g, filename, g.GoPackageName(df.importPath)) + } + + g.P() +} + +// Generate the enum definitions for this EnumDescriptor. +func (g *Generator) generateEnum(enum *EnumDescriptor) { + // The full type name + typeName := enum.TypeName() + // The full type name, CamelCased. + ccTypeName := CamelCaseSlice(typeName) + ccPrefix := enum.prefix() + + deprecatedEnum := "" + if enum.GetOptions().GetDeprecated() { + deprecatedEnum = deprecationComment + } + g.PrintComments(enum.path) + g.P("type ", Annotate(enum.file, enum.path, ccTypeName), " int32", deprecatedEnum) + g.file.addExport(enum, enumSymbol{ccTypeName, enum.proto3()}) + g.P("const (") + for i, e := range enum.Value { + etorPath := fmt.Sprintf("%s,%d,%d", enum.path, enumValuePath, i) + g.PrintComments(etorPath) + + deprecatedValue := "" + if e.GetOptions().GetDeprecated() { + deprecatedValue = deprecationComment + } + + name := ccPrefix + *e.Name + g.P(Annotate(enum.file, etorPath, name), " ", ccTypeName, " = ", e.Number, " ", deprecatedValue) + g.file.addExport(enum, constOrVarSymbol{name, "const", ccTypeName}) + } + g.P(")") + g.P() + g.P("var ", ccTypeName, "_name = map[int32]string{") + generated := make(map[int32]bool) // avoid duplicate values + for _, e := range enum.Value { + duplicate := "" + if _, present := generated[*e.Number]; present { + duplicate = "// Duplicate value: " + } + g.P(duplicate, e.Number, ": ", strconv.Quote(*e.Name), ",") + generated[*e.Number] = true + } + g.P("}") + g.P() + g.P("var ", ccTypeName, "_value = map[string]int32{") + for _, e := range enum.Value { + g.P(strconv.Quote(*e.Name), ": ", e.Number, ",") + } + g.P("}") + g.P() + + if !enum.proto3() { + g.P("func (x ", ccTypeName, ") Enum() *", ccTypeName, " {") + g.P("p := new(", ccTypeName, ")") + g.P("*p = x") + g.P("return p") + g.P("}") + g.P() + } + + g.P("func (x ", ccTypeName, ") String() string {") + g.P("return ", g.Pkg["proto"], ".EnumName(", ccTypeName, "_name, int32(x))") + g.P("}") + g.P() + + if !enum.proto3() { + g.P("func (x *", ccTypeName, ") UnmarshalJSON(data []byte) error {") + g.P("value, err := ", g.Pkg["proto"], ".UnmarshalJSONEnum(", ccTypeName, `_value, data, "`, ccTypeName, `")`) + g.P("if err != nil {") + g.P("return err") + g.P("}") + g.P("*x = ", ccTypeName, "(value)") + g.P("return nil") + g.P("}") + g.P() + } + + var indexes []string + for m := enum.parent; m != nil; m = m.parent { + // XXX: skip groups? + indexes = append([]string{strconv.Itoa(m.index)}, indexes...) + } + indexes = append(indexes, strconv.Itoa(enum.index)) + g.P("func (", ccTypeName, ") EnumDescriptor() ([]byte, []int) {") + g.P("return ", g.file.VarName(), ", []int{", strings.Join(indexes, ", "), "}") + g.P("}") + g.P() + if enum.file.GetPackage() == "google.protobuf" && enum.GetName() == "NullValue" { + g.P("func (", ccTypeName, `) XXX_WellKnownType() string { return "`, enum.GetName(), `" }`) + g.P() + } + + g.generateEnumRegistration(enum) +} + +// The tag is a string like "varint,2,opt,name=fieldname,def=7" that +// identifies details of the field for the protocol buffer marshaling and unmarshaling +// code. The fields are: +// wire encoding +// protocol tag number +// opt,req,rep for optional, required, or repeated +// packed whether the encoding is "packed" (optional; repeated primitives only) +// name= the original declared name +// enum= the name of the enum type if it is an enum-typed field. +// proto3 if this field is in a proto3 message +// def= string representation of the default value, if any. +// The default value must be in a representation that can be used at run-time +// to generate the default value. Thus bools become 0 and 1, for instance. +func (g *Generator) goTag(message *Descriptor, field *descriptor.FieldDescriptorProto, wiretype string) string { + optrepreq := "" + switch { + case isOptional(field): + optrepreq = "opt" + case isRequired(field): + optrepreq = "req" + case isRepeated(field): + optrepreq = "rep" + } + var defaultValue string + if dv := field.DefaultValue; dv != nil { // set means an explicit default + defaultValue = *dv + // Some types need tweaking. + switch *field.Type { + case descriptor.FieldDescriptorProto_TYPE_BOOL: + if defaultValue == "true" { + defaultValue = "1" + } else { + defaultValue = "0" + } + case descriptor.FieldDescriptorProto_TYPE_STRING, + descriptor.FieldDescriptorProto_TYPE_BYTES: + // Nothing to do. Quoting is done for the whole tag. + case descriptor.FieldDescriptorProto_TYPE_ENUM: + // For enums we need to provide the integer constant. + obj := g.ObjectNamed(field.GetTypeName()) + if id, ok := obj.(*ImportedDescriptor); ok { + // It is an enum that was publicly imported. + // We need the underlying type. + obj = id.o + } + enum, ok := obj.(*EnumDescriptor) + if !ok { + log.Printf("obj is a %T", obj) + if id, ok := obj.(*ImportedDescriptor); ok { + log.Printf("id.o is a %T", id.o) + } + g.Fail("unknown enum type", CamelCaseSlice(obj.TypeName())) + } + defaultValue = enum.integerValueAsString(defaultValue) + case descriptor.FieldDescriptorProto_TYPE_FLOAT: + if def := defaultValue; def != "inf" && def != "-inf" && def != "nan" { + if f, err := strconv.ParseFloat(defaultValue, 32); err == nil { + defaultValue = fmt.Sprint(float32(f)) + } + } + case descriptor.FieldDescriptorProto_TYPE_DOUBLE: + if def := defaultValue; def != "inf" && def != "-inf" && def != "nan" { + if f, err := strconv.ParseFloat(defaultValue, 64); err == nil { + defaultValue = fmt.Sprint(f) + } + } + } + defaultValue = ",def=" + defaultValue + } + enum := "" + if *field.Type == descriptor.FieldDescriptorProto_TYPE_ENUM { + // We avoid using obj.GoPackageName(), because we want to use the + // original (proto-world) package name. + obj := g.ObjectNamed(field.GetTypeName()) + if id, ok := obj.(*ImportedDescriptor); ok { + obj = id.o + } + enum = ",enum=" + if pkg := obj.File().GetPackage(); pkg != "" { + enum += pkg + "." + } + enum += CamelCaseSlice(obj.TypeName()) + } + packed := "" + if (field.Options != nil && field.Options.GetPacked()) || + // Per https://developers.google.com/protocol-buffers/docs/proto3#simple: + // "In proto3, repeated fields of scalar numeric types use packed encoding by default." + (message.proto3() && (field.Options == nil || field.Options.Packed == nil) && + isRepeated(field) && isScalar(field)) { + packed = ",packed" + } + fieldName := field.GetName() + name := fieldName + if *field.Type == descriptor.FieldDescriptorProto_TYPE_GROUP { + // We must use the type name for groups instead of + // the field name to preserve capitalization. + // type_name in FieldDescriptorProto is fully-qualified, + // but we only want the local part. + name = *field.TypeName + if i := strings.LastIndex(name, "."); i >= 0 { + name = name[i+1:] + } + } + if json := field.GetJsonName(); field.Extendee == nil && json != "" && json != name { + // TODO: escaping might be needed, in which case + // perhaps this should be in its own "json" tag. + name += ",json=" + json + } + name = ",name=" + name + if message.proto3() { + name += ",proto3" + } + oneof := "" + if field.OneofIndex != nil { + oneof = ",oneof" + } + return strconv.Quote(fmt.Sprintf("%s,%d,%s%s%s%s%s%s", + wiretype, + field.GetNumber(), + optrepreq, + packed, + name, + enum, + oneof, + defaultValue)) +} + +func needsStar(typ descriptor.FieldDescriptorProto_Type) bool { + switch typ { + case descriptor.FieldDescriptorProto_TYPE_GROUP: + return false + case descriptor.FieldDescriptorProto_TYPE_MESSAGE: + return false + case descriptor.FieldDescriptorProto_TYPE_BYTES: + return false + } + return true +} + +// TypeName is the printed name appropriate for an item. If the object is in the current file, +// TypeName drops the package name and underscores the rest. +// Otherwise the object is from another package; and the result is the underscored +// package name followed by the item name. +// The result always has an initial capital. +func (g *Generator) TypeName(obj Object) string { + return g.DefaultPackageName(obj) + CamelCaseSlice(obj.TypeName()) +} + +// GoType returns a string representing the type name, and the wire type +func (g *Generator) GoType(message *Descriptor, field *descriptor.FieldDescriptorProto) (typ string, wire string) { + // TODO: Options. + switch *field.Type { + case descriptor.FieldDescriptorProto_TYPE_DOUBLE: + typ, wire = "float64", "fixed64" + case descriptor.FieldDescriptorProto_TYPE_FLOAT: + typ, wire = "float32", "fixed32" + case descriptor.FieldDescriptorProto_TYPE_INT64: + typ, wire = "int64", "varint" + case descriptor.FieldDescriptorProto_TYPE_UINT64: + typ, wire = "uint64", "varint" + case descriptor.FieldDescriptorProto_TYPE_INT32: + typ, wire = "int32", "varint" + case descriptor.FieldDescriptorProto_TYPE_UINT32: + typ, wire = "uint32", "varint" + case descriptor.FieldDescriptorProto_TYPE_FIXED64: + typ, wire = "uint64", "fixed64" + case descriptor.FieldDescriptorProto_TYPE_FIXED32: + typ, wire = "uint32", "fixed32" + case descriptor.FieldDescriptorProto_TYPE_BOOL: + typ, wire = "bool", "varint" + case descriptor.FieldDescriptorProto_TYPE_STRING: + typ, wire = "string", "bytes" + case descriptor.FieldDescriptorProto_TYPE_GROUP: + desc := g.ObjectNamed(field.GetTypeName()) + typ, wire = "*"+g.TypeName(desc), "group" + case descriptor.FieldDescriptorProto_TYPE_MESSAGE: + desc := g.ObjectNamed(field.GetTypeName()) + typ, wire = "*"+g.TypeName(desc), "bytes" + case descriptor.FieldDescriptorProto_TYPE_BYTES: + typ, wire = "[]byte", "bytes" + case descriptor.FieldDescriptorProto_TYPE_ENUM: + desc := g.ObjectNamed(field.GetTypeName()) + typ, wire = g.TypeName(desc), "varint" + case descriptor.FieldDescriptorProto_TYPE_SFIXED32: + typ, wire = "int32", "fixed32" + case descriptor.FieldDescriptorProto_TYPE_SFIXED64: + typ, wire = "int64", "fixed64" + case descriptor.FieldDescriptorProto_TYPE_SINT32: + typ, wire = "int32", "zigzag32" + case descriptor.FieldDescriptorProto_TYPE_SINT64: + typ, wire = "int64", "zigzag64" + default: + g.Fail("unknown type for", field.GetName()) + } + if isRepeated(field) { + typ = "[]" + typ + } else if message != nil && message.proto3() { + return + } else if field.OneofIndex != nil && message != nil { + return + } else if needsStar(*field.Type) { + typ = "*" + typ + } + return +} + +func (g *Generator) RecordTypeUse(t string) { + if _, ok := g.typeNameToObject[t]; !ok { + return + } + importPath := g.ObjectNamed(t).GoImportPath() + if importPath == g.outputImportPath { + // Don't record use of objects in our package. + return + } + g.AddImport(importPath) + g.usedPackages[importPath] = true +} + +// Method names that may be generated. Fields with these names get an +// underscore appended. Any change to this set is a potential incompatible +// API change because it changes generated field names. +var methodNames = [...]string{ + "Reset", + "String", + "ProtoMessage", + "Marshal", + "Unmarshal", + "ExtensionRangeArray", + "ExtensionMap", + "Descriptor", +} + +// Names of messages in the `google.protobuf` package for which +// we will generate XXX_WellKnownType methods. +var wellKnownTypes = map[string]bool{ + "Any": true, + "Duration": true, + "Empty": true, + "Struct": true, + "Timestamp": true, + + "Value": true, + "ListValue": true, + "DoubleValue": true, + "FloatValue": true, + "Int64Value": true, + "UInt64Value": true, + "Int32Value": true, + "UInt32Value": true, + "BoolValue": true, + "StringValue": true, + "BytesValue": true, +} + +// getterDefault finds the default value for the field to return from a getter, +// regardless of if it's a built in default or explicit from the source. Returns e.g. "nil", `""`, "Default_MessageType_FieldName" +func (g *Generator) getterDefault(field *descriptor.FieldDescriptorProto, goMessageType string) string { + if isRepeated(field) { + return "nil" + } + if def := field.GetDefaultValue(); def != "" { + defaultConstant := g.defaultConstantName(goMessageType, field.GetName()) + if *field.Type != descriptor.FieldDescriptorProto_TYPE_BYTES { + return defaultConstant + } + return "append([]byte(nil), " + defaultConstant + "...)" + } + switch *field.Type { + case descriptor.FieldDescriptorProto_TYPE_BOOL: + return "false" + case descriptor.FieldDescriptorProto_TYPE_STRING: + return `""` + case descriptor.FieldDescriptorProto_TYPE_GROUP, descriptor.FieldDescriptorProto_TYPE_MESSAGE, descriptor.FieldDescriptorProto_TYPE_BYTES: + return "nil" + case descriptor.FieldDescriptorProto_TYPE_ENUM: + obj := g.ObjectNamed(field.GetTypeName()) + var enum *EnumDescriptor + if id, ok := obj.(*ImportedDescriptor); ok { + // The enum type has been publicly imported. + enum, _ = id.o.(*EnumDescriptor) + } else { + enum, _ = obj.(*EnumDescriptor) + } + if enum == nil { + log.Printf("don't know how to generate getter for %s", field.GetName()) + return "nil" + } + if len(enum.Value) == 0 { + return "0 // empty enum" + } + first := enum.Value[0].GetName() + return g.DefaultPackageName(obj) + enum.prefix() + first + default: + return "0" + } +} + +// defaultConstantName builds the name of the default constant from the message +// type name and the untouched field name, e.g. "Default_MessageType_FieldName" +func (g *Generator) defaultConstantName(goMessageType, protoFieldName string) string { + return "Default_" + goMessageType + "_" + CamelCase(protoFieldName) +} + +// The different types of fields in a message and how to actually print them +// Most of the logic for generateMessage is in the methods of these types. +// +// Note that the content of the field is irrelevant, a simpleField can contain +// anything from a scalar to a group (which is just a message). +// +// Extension fields (and message sets) are however handled separately. +// +// simpleField - a field that is neiter weak nor oneof, possibly repeated +// oneofField - field containing list of subfields: +// - oneofSubField - a field within the oneof + +// msgCtx contains the context for the generator functions. +type msgCtx struct { + goName string // Go struct name of the message, e.g. MessageName + message *Descriptor // The descriptor for the message +} + +// fieldCommon contains data common to all types of fields. +type fieldCommon struct { + goName string // Go name of field, e.g. "FieldName" or "Descriptor_" + protoName string // Name of field in proto language, e.g. "field_name" or "descriptor" + getterName string // Name of the getter, e.g. "GetFieldName" or "GetDescriptor_" + goType string // The Go type as a string, e.g. "*int32" or "*OtherMessage" + tags string // The tag string/annotation for the type, e.g. `protobuf:"varint,8,opt,name=region_id,json=regionId"` + fullPath string // The full path of the field as used by Annotate etc, e.g. "4,0,2,0" +} + +// getProtoName gets the proto name of a field, e.g. "field_name" or "descriptor". +func (f *fieldCommon) getProtoName() string { + return f.protoName +} + +// getGoType returns the go type of the field as a string, e.g. "*int32". +func (f *fieldCommon) getGoType() string { + return f.goType +} + +// simpleField is not weak, not a oneof, not an extension. Can be required, optional or repeated. +type simpleField struct { + fieldCommon + protoTypeName string // Proto type name, empty if primitive, e.g. ".google.protobuf.Duration" + protoType descriptor.FieldDescriptorProto_Type // Actual type enum value, e.g. descriptor.FieldDescriptorProto_TYPE_FIXED64 + deprecated string // Deprecation comment, if any, e.g. "// Deprecated: Do not use." + getterDef string // Default for getters, e.g. "nil", `""` or "Default_MessageType_FieldName" + protoDef string // Default value as defined in the proto file, e.g "yoshi" or "5" + comment string // The full comment for the field, e.g. "// Useful information" +} + +// decl prints the declaration of the field in the struct (if any). +func (f *simpleField) decl(g *Generator, mc *msgCtx) { + g.P(f.comment, Annotate(mc.message.file, f.fullPath, f.goName), "\t", f.goType, "\t`", f.tags, "`", f.deprecated) +} + +// getter prints the getter for the field. +func (f *simpleField) getter(g *Generator, mc *msgCtx) { + star := "" + tname := f.goType + if needsStar(f.protoType) && tname[0] == '*' { + tname = tname[1:] + star = "*" + } + if f.deprecated != "" { + g.P(f.deprecated) + } + g.P("func (m *", mc.goName, ") ", Annotate(mc.message.file, f.fullPath, f.getterName), "() "+tname+" {") + if f.getterDef == "nil" { // Simpler getter + g.P("if m != nil {") + g.P("return m." + f.goName) + g.P("}") + g.P("return nil") + g.P("}") + g.P() + return + } + if mc.message.proto3() { + g.P("if m != nil {") + } else { + g.P("if m != nil && m." + f.goName + " != nil {") + } + g.P("return " + star + "m." + f.goName) + g.P("}") + g.P("return ", f.getterDef) + g.P("}") + g.P() +} + +// setter prints the setter method of the field. +func (f *simpleField) setter(g *Generator, mc *msgCtx) { + // No setter for regular fields yet +} + +// getProtoDef returns the default value explicitly stated in the proto file, e.g "yoshi" or "5". +func (f *simpleField) getProtoDef() string { + return f.protoDef +} + +// getProtoTypeName returns the protobuf type name for the field as returned by field.GetTypeName(), e.g. ".google.protobuf.Duration". +func (f *simpleField) getProtoTypeName() string { + return f.protoTypeName +} + +// getProtoType returns the *field.Type value, e.g. descriptor.FieldDescriptorProto_TYPE_FIXED64. +func (f *simpleField) getProtoType() descriptor.FieldDescriptorProto_Type { + return f.protoType +} + +// oneofSubFields are kept slize held by each oneofField. They do not appear in the top level slize of fields for the message. +type oneofSubField struct { + fieldCommon + protoTypeName string // Proto type name, empty if primitive, e.g. ".google.protobuf.Duration" + protoType descriptor.FieldDescriptorProto_Type // Actual type enum value, e.g. descriptor.FieldDescriptorProto_TYPE_FIXED64 + oneofTypeName string // Type name of the enclosing struct, e.g. "MessageName_FieldName" + fieldNumber int // Actual field number, as defined in proto, e.g. 12 + getterDef string // Default for getters, e.g. "nil", `""` or "Default_MessageType_FieldName" + protoDef string // Default value as defined in the proto file, e.g "yoshi" or "5" + deprecated string // Deprecation comment, if any. +} + +// typedNil prints a nil casted to the pointer to this field. +// - for XXX_OneofWrappers +func (f *oneofSubField) typedNil(g *Generator) { + g.P("(*", f.oneofTypeName, ")(nil),") +} + +// getProtoDef returns the default value explicitly stated in the proto file, e.g "yoshi" or "5". +func (f *oneofSubField) getProtoDef() string { + return f.protoDef +} + +// getProtoTypeName returns the protobuf type name for the field as returned by field.GetTypeName(), e.g. ".google.protobuf.Duration". +func (f *oneofSubField) getProtoTypeName() string { + return f.protoTypeName +} + +// getProtoType returns the *field.Type value, e.g. descriptor.FieldDescriptorProto_TYPE_FIXED64. +func (f *oneofSubField) getProtoType() descriptor.FieldDescriptorProto_Type { + return f.protoType +} + +// oneofField represents the oneof on top level. +// The alternative fields within the oneof are represented by oneofSubField. +type oneofField struct { + fieldCommon + subFields []*oneofSubField // All the possible oneof fields + comment string // The full comment for the field, e.g. "// Types that are valid to be assigned to MyOneof:\n\\" +} + +// decl prints the declaration of the field in the struct (if any). +func (f *oneofField) decl(g *Generator, mc *msgCtx) { + comment := f.comment + for _, sf := range f.subFields { + comment += "//\t*" + sf.oneofTypeName + "\n" + } + g.P(comment, Annotate(mc.message.file, f.fullPath, f.goName), " ", f.goType, " `", f.tags, "`") +} + +// getter for a oneof field will print additional discriminators and interfaces for the oneof, +// also it prints all the getters for the sub fields. +func (f *oneofField) getter(g *Generator, mc *msgCtx) { + // The discriminator type + g.P("type ", f.goType, " interface {") + g.P(f.goType, "()") + g.P("}") + g.P() + // The subField types, fulfilling the discriminator type contract + for _, sf := range f.subFields { + g.P("type ", Annotate(mc.message.file, sf.fullPath, sf.oneofTypeName), " struct {") + g.P(Annotate(mc.message.file, sf.fullPath, sf.goName), " ", sf.goType, " `", sf.tags, "`") + g.P("}") + g.P() + } + for _, sf := range f.subFields { + g.P("func (*", sf.oneofTypeName, ") ", f.goType, "() {}") + g.P() + } + // Getter for the oneof field + g.P("func (m *", mc.goName, ") ", Annotate(mc.message.file, f.fullPath, f.getterName), "() ", f.goType, " {") + g.P("if m != nil { return m.", f.goName, " }") + g.P("return nil") + g.P("}") + g.P() + // Getters for each oneof + for _, sf := range f.subFields { + if sf.deprecated != "" { + g.P(sf.deprecated) + } + g.P("func (m *", mc.goName, ") ", Annotate(mc.message.file, sf.fullPath, sf.getterName), "() "+sf.goType+" {") + g.P("if x, ok := m.", f.getterName, "().(*", sf.oneofTypeName, "); ok {") + g.P("return x.", sf.goName) + g.P("}") + g.P("return ", sf.getterDef) + g.P("}") + g.P() + } +} + +// setter prints the setter method of the field. +func (f *oneofField) setter(g *Generator, mc *msgCtx) { + // No setters for oneof yet +} + +// topLevelField interface implemented by all types of fields on the top level (not oneofSubField). +type topLevelField interface { + decl(g *Generator, mc *msgCtx) // print declaration within the struct + getter(g *Generator, mc *msgCtx) // print getter + setter(g *Generator, mc *msgCtx) // print setter if applicable +} + +// defField interface implemented by all types of fields that can have defaults (not oneofField, but instead oneofSubField). +type defField interface { + getProtoDef() string // default value explicitly stated in the proto file, e.g "yoshi" or "5" + getProtoName() string // proto name of a field, e.g. "field_name" or "descriptor" + getGoType() string // go type of the field as a string, e.g. "*int32" + getProtoTypeName() string // protobuf type name for the field, e.g. ".google.protobuf.Duration" + getProtoType() descriptor.FieldDescriptorProto_Type // *field.Type value, e.g. descriptor.FieldDescriptorProto_TYPE_FIXED64 +} + +// generateDefaultConstants adds constants for default values if needed, which is only if the default value is. +// explicit in the proto. +func (g *Generator) generateDefaultConstants(mc *msgCtx, topLevelFields []topLevelField) { + // Collect fields that can have defaults + dFields := []defField{} + for _, pf := range topLevelFields { + if f, ok := pf.(*oneofField); ok { + for _, osf := range f.subFields { + dFields = append(dFields, osf) + } + continue + } + dFields = append(dFields, pf.(defField)) + } + for _, df := range dFields { + def := df.getProtoDef() + if def == "" { + continue + } + fieldname := g.defaultConstantName(mc.goName, df.getProtoName()) + typename := df.getGoType() + if typename[0] == '*' { + typename = typename[1:] + } + kind := "const " + switch { + case typename == "bool": + case typename == "string": + def = strconv.Quote(def) + case typename == "[]byte": + def = "[]byte(" + strconv.Quote(unescape(def)) + ")" + kind = "var " + case def == "inf", def == "-inf", def == "nan": + // These names are known to, and defined by, the protocol language. + switch def { + case "inf": + def = "math.Inf(1)" + case "-inf": + def = "math.Inf(-1)" + case "nan": + def = "math.NaN()" + } + if df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_FLOAT { + def = "float32(" + def + ")" + } + kind = "var " + case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_FLOAT: + if f, err := strconv.ParseFloat(def, 32); err == nil { + def = fmt.Sprint(float32(f)) + } + case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_DOUBLE: + if f, err := strconv.ParseFloat(def, 64); err == nil { + def = fmt.Sprint(f) + } + case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_ENUM: + // Must be an enum. Need to construct the prefixed name. + obj := g.ObjectNamed(df.getProtoTypeName()) + var enum *EnumDescriptor + if id, ok := obj.(*ImportedDescriptor); ok { + // The enum type has been publicly imported. + enum, _ = id.o.(*EnumDescriptor) + } else { + enum, _ = obj.(*EnumDescriptor) + } + if enum == nil { + log.Printf("don't know how to generate constant for %s", fieldname) + continue + } + def = g.DefaultPackageName(obj) + enum.prefix() + def + } + g.P(kind, fieldname, " ", typename, " = ", def) + g.file.addExport(mc.message, constOrVarSymbol{fieldname, kind, ""}) + } + g.P() +} + +// generateInternalStructFields just adds the XXX_ fields to the message struct. +func (g *Generator) generateInternalStructFields(mc *msgCtx, topLevelFields []topLevelField) { + g.P("XXX_NoUnkeyedLiteral\tstruct{} `json:\"-\"`") // prevent unkeyed struct literals + if len(mc.message.ExtensionRange) > 0 { + messageset := "" + if opts := mc.message.Options; opts != nil && opts.GetMessageSetWireFormat() { + messageset = "protobuf_messageset:\"1\" " + } + g.P(g.Pkg["proto"], ".XXX_InternalExtensions `", messageset, "json:\"-\"`") + } + g.P("XXX_unrecognized\t[]byte `json:\"-\"`") + g.P("XXX_sizecache\tint32 `json:\"-\"`") + +} + +// generateOneofFuncs adds all the utility functions for oneof, including marshalling, unmarshalling and sizer. +func (g *Generator) generateOneofFuncs(mc *msgCtx, topLevelFields []topLevelField) { + ofields := []*oneofField{} + for _, f := range topLevelFields { + if o, ok := f.(*oneofField); ok { + ofields = append(ofields, o) + } + } + if len(ofields) == 0 { + return + } + + // OneofFuncs + g.P("// XXX_OneofWrappers is for the internal use of the proto package.") + g.P("func (*", mc.goName, ") XXX_OneofWrappers() []interface{} {") + g.P("return []interface{}{") + for _, of := range ofields { + for _, sf := range of.subFields { + sf.typedNil(g) + } + } + g.P("}") + g.P("}") + g.P() +} + +// generateMessageStruct adds the actual struct with it's members (but not methods) to the output. +func (g *Generator) generateMessageStruct(mc *msgCtx, topLevelFields []topLevelField) { + comments := g.PrintComments(mc.message.path) + + // Guarantee deprecation comments appear after user-provided comments. + if mc.message.GetOptions().GetDeprecated() { + if comments { + // Convention: Separate deprecation comments from original + // comments with an empty line. + g.P("//") + } + g.P(deprecationComment) + } + + g.P("type ", Annotate(mc.message.file, mc.message.path, mc.goName), " struct {") + for _, pf := range topLevelFields { + pf.decl(g, mc) + } + g.generateInternalStructFields(mc, topLevelFields) + g.P("}") +} + +// generateGetters adds getters for all fields, including oneofs and weak fields when applicable. +func (g *Generator) generateGetters(mc *msgCtx, topLevelFields []topLevelField) { + for _, pf := range topLevelFields { + pf.getter(g, mc) + } +} + +// generateSetters add setters for all fields, including oneofs and weak fields when applicable. +func (g *Generator) generateSetters(mc *msgCtx, topLevelFields []topLevelField) { + for _, pf := range topLevelFields { + pf.setter(g, mc) + } +} + +// generateCommonMethods adds methods to the message that are not on a per field basis. +func (g *Generator) generateCommonMethods(mc *msgCtx) { + // Reset, String and ProtoMessage methods. + g.P("func (m *", mc.goName, ") Reset() { *m = ", mc.goName, "{} }") + g.P("func (m *", mc.goName, ") String() string { return ", g.Pkg["proto"], ".CompactTextString(m) }") + g.P("func (*", mc.goName, ") ProtoMessage() {}") + var indexes []string + for m := mc.message; m != nil; m = m.parent { + indexes = append([]string{strconv.Itoa(m.index)}, indexes...) + } + g.P("func (*", mc.goName, ") Descriptor() ([]byte, []int) {") + g.P("return ", g.file.VarName(), ", []int{", strings.Join(indexes, ", "), "}") + g.P("}") + g.P() + // TODO: Revisit the decision to use a XXX_WellKnownType method + // if we change proto.MessageName to work with multiple equivalents. + if mc.message.file.GetPackage() == "google.protobuf" && wellKnownTypes[mc.message.GetName()] { + g.P("func (*", mc.goName, `) XXX_WellKnownType() string { return "`, mc.message.GetName(), `" }`) + g.P() + } + + // Extension support methods + if len(mc.message.ExtensionRange) > 0 { + g.P() + g.P("var extRange_", mc.goName, " = []", g.Pkg["proto"], ".ExtensionRange{") + for _, r := range mc.message.ExtensionRange { + end := fmt.Sprint(*r.End - 1) // make range inclusive on both ends + g.P("{Start: ", r.Start, ", End: ", end, "},") + } + g.P("}") + g.P("func (*", mc.goName, ") ExtensionRangeArray() []", g.Pkg["proto"], ".ExtensionRange {") + g.P("return extRange_", mc.goName) + g.P("}") + g.P() + } + + // TODO: It does not scale to keep adding another method for every + // operation on protos that we want to switch over to using the + // table-driven approach. Instead, we should only add a single method + // that allows getting access to the *InternalMessageInfo struct and then + // calling Unmarshal, Marshal, Merge, Size, and Discard directly on that. + + // Wrapper for table-driven marshaling and unmarshaling. + g.P("func (m *", mc.goName, ") XXX_Unmarshal(b []byte) error {") + g.P("return xxx_messageInfo_", mc.goName, ".Unmarshal(m, b)") + g.P("}") + + g.P("func (m *", mc.goName, ") XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {") + g.P("return xxx_messageInfo_", mc.goName, ".Marshal(b, m, deterministic)") + g.P("}") + + g.P("func (m *", mc.goName, ") XXX_Merge(src ", g.Pkg["proto"], ".Message) {") + g.P("xxx_messageInfo_", mc.goName, ".Merge(m, src)") + g.P("}") + + g.P("func (m *", mc.goName, ") XXX_Size() int {") // avoid name clash with "Size" field in some message + g.P("return xxx_messageInfo_", mc.goName, ".Size(m)") + g.P("}") + + g.P("func (m *", mc.goName, ") XXX_DiscardUnknown() {") + g.P("xxx_messageInfo_", mc.goName, ".DiscardUnknown(m)") + g.P("}") + + g.P("var xxx_messageInfo_", mc.goName, " ", g.Pkg["proto"], ".InternalMessageInfo") + g.P() +} + +// Generate the type, methods and default constant definitions for this Descriptor. +func (g *Generator) generateMessage(message *Descriptor) { + topLevelFields := []topLevelField{} + oFields := make(map[int32]*oneofField) + // The full type name + typeName := message.TypeName() + // The full type name, CamelCased. + goTypeName := CamelCaseSlice(typeName) + + usedNames := make(map[string]bool) + for _, n := range methodNames { + usedNames[n] = true + } + + // allocNames finds a conflict-free variation of the given strings, + // consistently mutating their suffixes. + // It returns the same number of strings. + allocNames := func(ns ...string) []string { + Loop: + for { + for _, n := range ns { + if usedNames[n] { + for i := range ns { + ns[i] += "_" + } + continue Loop + } + } + for _, n := range ns { + usedNames[n] = true + } + return ns + } + } + + mapFieldTypes := make(map[*descriptor.FieldDescriptorProto]string) // keep track of the map fields to be added later + + // Build a structure more suitable for generating the text in one pass + for i, field := range message.Field { + // Allocate the getter and the field at the same time so name + // collisions create field/method consistent names. + // TODO: This allocation occurs based on the order of the fields + // in the proto file, meaning that a change in the field + // ordering can change generated Method/Field names. + base := CamelCase(*field.Name) + ns := allocNames(base, "Get"+base) + fieldName, fieldGetterName := ns[0], ns[1] + typename, wiretype := g.GoType(message, field) + jsonName := *field.Name + tag := fmt.Sprintf("protobuf:%s json:%q", g.goTag(message, field, wiretype), jsonName+",omitempty") + + oneof := field.OneofIndex != nil + if oneof && oFields[*field.OneofIndex] == nil { + odp := message.OneofDecl[int(*field.OneofIndex)] + base := CamelCase(odp.GetName()) + fname := allocNames(base)[0] + + // This is the first field of a oneof we haven't seen before. + // Generate the union field. + oneofFullPath := fmt.Sprintf("%s,%d,%d", message.path, messageOneofPath, *field.OneofIndex) + c, ok := g.makeComments(oneofFullPath) + if ok { + c += "\n//\n" + } + c += "// Types that are valid to be assigned to " + fname + ":\n" + // Generate the rest of this comment later, + // when we've computed any disambiguation. + + dname := "is" + goTypeName + "_" + fname + tag := `protobuf_oneof:"` + odp.GetName() + `"` + of := oneofField{ + fieldCommon: fieldCommon{ + goName: fname, + getterName: "Get" + fname, + goType: dname, + tags: tag, + protoName: odp.GetName(), + fullPath: oneofFullPath, + }, + comment: c, + } + topLevelFields = append(topLevelFields, &of) + oFields[*field.OneofIndex] = &of + } + + if *field.Type == descriptor.FieldDescriptorProto_TYPE_MESSAGE { + desc := g.ObjectNamed(field.GetTypeName()) + if d, ok := desc.(*Descriptor); ok && d.GetOptions().GetMapEntry() { + // Figure out the Go types and tags for the key and value types. + keyField, valField := d.Field[0], d.Field[1] + keyType, keyWire := g.GoType(d, keyField) + valType, valWire := g.GoType(d, valField) + keyTag, valTag := g.goTag(d, keyField, keyWire), g.goTag(d, valField, valWire) + + // We don't use stars, except for message-typed values. + // Message and enum types are the only two possibly foreign types used in maps, + // so record their use. They are not permitted as map keys. + keyType = strings.TrimPrefix(keyType, "*") + switch *valField.Type { + case descriptor.FieldDescriptorProto_TYPE_ENUM: + valType = strings.TrimPrefix(valType, "*") + g.RecordTypeUse(valField.GetTypeName()) + case descriptor.FieldDescriptorProto_TYPE_MESSAGE: + g.RecordTypeUse(valField.GetTypeName()) + default: + valType = strings.TrimPrefix(valType, "*") + } + + typename = fmt.Sprintf("map[%s]%s", keyType, valType) + mapFieldTypes[field] = typename // record for the getter generation + + tag += fmt.Sprintf(" protobuf_key:%s protobuf_val:%s", keyTag, valTag) + } + } + + fieldDeprecated := "" + if field.GetOptions().GetDeprecated() { + fieldDeprecated = deprecationComment + } + + dvalue := g.getterDefault(field, goTypeName) + if oneof { + tname := goTypeName + "_" + fieldName + // It is possible for this to collide with a message or enum + // nested in this message. Check for collisions. + for { + ok := true + for _, desc := range message.nested { + if CamelCaseSlice(desc.TypeName()) == tname { + ok = false + break + } + } + for _, enum := range message.enums { + if CamelCaseSlice(enum.TypeName()) == tname { + ok = false + break + } + } + if !ok { + tname += "_" + continue + } + break + } + + oneofField := oFields[*field.OneofIndex] + tag := "protobuf:" + g.goTag(message, field, wiretype) + sf := oneofSubField{ + fieldCommon: fieldCommon{ + goName: fieldName, + getterName: fieldGetterName, + goType: typename, + tags: tag, + protoName: field.GetName(), + fullPath: fmt.Sprintf("%s,%d,%d", message.path, messageFieldPath, i), + }, + protoTypeName: field.GetTypeName(), + fieldNumber: int(*field.Number), + protoType: *field.Type, + getterDef: dvalue, + protoDef: field.GetDefaultValue(), + oneofTypeName: tname, + deprecated: fieldDeprecated, + } + oneofField.subFields = append(oneofField.subFields, &sf) + g.RecordTypeUse(field.GetTypeName()) + continue + } + + fieldFullPath := fmt.Sprintf("%s,%d,%d", message.path, messageFieldPath, i) + c, ok := g.makeComments(fieldFullPath) + if ok { + c += "\n" + } + rf := simpleField{ + fieldCommon: fieldCommon{ + goName: fieldName, + getterName: fieldGetterName, + goType: typename, + tags: tag, + protoName: field.GetName(), + fullPath: fieldFullPath, + }, + protoTypeName: field.GetTypeName(), + protoType: *field.Type, + deprecated: fieldDeprecated, + getterDef: dvalue, + protoDef: field.GetDefaultValue(), + comment: c, + } + var pf topLevelField = &rf + + topLevelFields = append(topLevelFields, pf) + g.RecordTypeUse(field.GetTypeName()) + } + + mc := &msgCtx{ + goName: goTypeName, + message: message, + } + + g.generateMessageStruct(mc, topLevelFields) + g.P() + g.generateCommonMethods(mc) + g.P() + g.generateDefaultConstants(mc, topLevelFields) + g.P() + g.generateGetters(mc, topLevelFields) + g.P() + g.generateSetters(mc, topLevelFields) + g.P() + g.generateOneofFuncs(mc, topLevelFields) + g.P() + + var oneofTypes []string + for _, f := range topLevelFields { + if of, ok := f.(*oneofField); ok { + for _, osf := range of.subFields { + oneofTypes = append(oneofTypes, osf.oneofTypeName) + } + } + } + + opts := message.Options + ms := &messageSymbol{ + sym: goTypeName, + hasExtensions: len(message.ExtensionRange) > 0, + isMessageSet: opts != nil && opts.GetMessageSetWireFormat(), + oneofTypes: oneofTypes, + } + g.file.addExport(message, ms) + + for _, ext := range message.ext { + g.generateExtension(ext) + } + + fullName := strings.Join(message.TypeName(), ".") + if g.file.Package != nil { + fullName = *g.file.Package + "." + fullName + } + + g.addInitf("%s.RegisterType((*%s)(nil), %q)", g.Pkg["proto"], goTypeName, fullName) + // Register types for native map types. + for _, k := range mapFieldKeys(mapFieldTypes) { + fullName := strings.TrimPrefix(*k.TypeName, ".") + g.addInitf("%s.RegisterMapType((%s)(nil), %q)", g.Pkg["proto"], mapFieldTypes[k], fullName) + } + +} + +type byTypeName []*descriptor.FieldDescriptorProto + +func (a byTypeName) Len() int { return len(a) } +func (a byTypeName) Swap(i, j int) { a[i], a[j] = a[j], a[i] } +func (a byTypeName) Less(i, j int) bool { return *a[i].TypeName < *a[j].TypeName } + +// mapFieldKeys returns the keys of m in a consistent order. +func mapFieldKeys(m map[*descriptor.FieldDescriptorProto]string) []*descriptor.FieldDescriptorProto { + keys := make([]*descriptor.FieldDescriptorProto, 0, len(m)) + for k := range m { + keys = append(keys, k) + } + sort.Sort(byTypeName(keys)) + return keys +} + +var escapeChars = [256]byte{ + 'a': '\a', 'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t', 'v': '\v', '\\': '\\', '"': '"', '\'': '\'', '?': '?', +} + +// unescape reverses the "C" escaping that protoc does for default values of bytes fields. +// It is best effort in that it effectively ignores malformed input. Seemingly invalid escape +// sequences are conveyed, unmodified, into the decoded result. +func unescape(s string) string { + // NB: Sadly, we can't use strconv.Unquote because protoc will escape both + // single and double quotes, but strconv.Unquote only allows one or the + // other (based on actual surrounding quotes of its input argument). + + var out []byte + for len(s) > 0 { + // regular character, or too short to be valid escape + if s[0] != '\\' || len(s) < 2 { + out = append(out, s[0]) + s = s[1:] + } else if c := escapeChars[s[1]]; c != 0 { + // escape sequence + out = append(out, c) + s = s[2:] + } else if s[1] == 'x' || s[1] == 'X' { + // hex escape, e.g. "\x80 + if len(s) < 4 { + // too short to be valid + out = append(out, s[:2]...) + s = s[2:] + continue + } + v, err := strconv.ParseUint(s[2:4], 16, 8) + if err != nil { + out = append(out, s[:4]...) + } else { + out = append(out, byte(v)) + } + s = s[4:] + } else if '0' <= s[1] && s[1] <= '7' { + // octal escape, can vary from 1 to 3 octal digits; e.g., "\0" "\40" or "\164" + // so consume up to 2 more bytes or up to end-of-string + n := len(s[1:]) - len(strings.TrimLeft(s[1:], "01234567")) + if n > 3 { + n = 3 + } + v, err := strconv.ParseUint(s[1:1+n], 8, 8) + if err != nil { + out = append(out, s[:1+n]...) + } else { + out = append(out, byte(v)) + } + s = s[1+n:] + } else { + // bad escape, just propagate the slash as-is + out = append(out, s[0]) + s = s[1:] + } + } + + return string(out) +} + +func (g *Generator) generateExtension(ext *ExtensionDescriptor) { + ccTypeName := ext.DescName() + + extObj := g.ObjectNamed(*ext.Extendee) + var extDesc *Descriptor + if id, ok := extObj.(*ImportedDescriptor); ok { + // This is extending a publicly imported message. + // We need the underlying type for goTag. + extDesc = id.o.(*Descriptor) + } else { + extDesc = extObj.(*Descriptor) + } + extendedType := "*" + g.TypeName(extObj) // always use the original + field := ext.FieldDescriptorProto + fieldType, wireType := g.GoType(ext.parent, field) + tag := g.goTag(extDesc, field, wireType) + g.RecordTypeUse(*ext.Extendee) + if n := ext.FieldDescriptorProto.TypeName; n != nil { + // foreign extension type + g.RecordTypeUse(*n) + } + + typeName := ext.TypeName() + + // Special case for proto2 message sets: If this extension is extending + // proto2.bridge.MessageSet, and its final name component is "message_set_extension", + // then drop that last component. + // + // TODO: This should be implemented in the text formatter rather than the generator. + // In addition, the situation for when to apply this special case is implemented + // differently in other languages: + // https://github.com/google/protobuf/blob/aff10976/src/google/protobuf/text_format.cc#L1560 + if extDesc.GetOptions().GetMessageSetWireFormat() && typeName[len(typeName)-1] == "message_set_extension" { + typeName = typeName[:len(typeName)-1] + } + + // For text formatting, the package must be exactly what the .proto file declares, + // ignoring overrides such as the go_package option, and with no dot/underscore mapping. + extName := strings.Join(typeName, ".") + if g.file.Package != nil { + extName = *g.file.Package + "." + extName + } + + g.P("var ", ccTypeName, " = &", g.Pkg["proto"], ".ExtensionDesc{") + g.P("ExtendedType: (", extendedType, ")(nil),") + g.P("ExtensionType: (", fieldType, ")(nil),") + g.P("Field: ", field.Number, ",") + g.P(`Name: "`, extName, `",`) + g.P("Tag: ", tag, ",") + g.P(`Filename: "`, g.file.GetName(), `",`) + + g.P("}") + g.P() + + g.addInitf("%s.RegisterExtension(%s)", g.Pkg["proto"], ext.DescName()) + + g.file.addExport(ext, constOrVarSymbol{ccTypeName, "var", ""}) +} + +func (g *Generator) generateInitFunction() { + if len(g.init) == 0 { + return + } + g.P("func init() {") + for _, l := range g.init { + g.P(l) + } + g.P("}") + g.init = nil +} + +func (g *Generator) generateFileDescriptor(file *FileDescriptor) { + // Make a copy and trim source_code_info data. + // TODO: Trim this more when we know exactly what we need. + pb := proto.Clone(file.FileDescriptorProto).(*descriptor.FileDescriptorProto) + pb.SourceCodeInfo = nil + + b, err := proto.Marshal(pb) + if err != nil { + g.Fail(err.Error()) + } + + var buf bytes.Buffer + w, _ := gzip.NewWriterLevel(&buf, gzip.BestCompression) + w.Write(b) + w.Close() + b = buf.Bytes() + + v := file.VarName() + g.P() + g.P("func init() { ", g.Pkg["proto"], ".RegisterFile(", strconv.Quote(*file.Name), ", ", v, ") }") + g.P("var ", v, " = []byte{") + g.P("// ", len(b), " bytes of a gzipped FileDescriptorProto") + for len(b) > 0 { + n := 16 + if n > len(b) { + n = len(b) + } + + s := "" + for _, c := range b[:n] { + s += fmt.Sprintf("0x%02x,", c) + } + g.P(s) + + b = b[n:] + } + g.P("}") +} + +func (g *Generator) generateEnumRegistration(enum *EnumDescriptor) { + // // We always print the full (proto-world) package name here. + pkg := enum.File().GetPackage() + if pkg != "" { + pkg += "." + } + // The full type name + typeName := enum.TypeName() + // The full type name, CamelCased. + ccTypeName := CamelCaseSlice(typeName) + g.addInitf("%s.RegisterEnum(%q, %[3]s_name, %[3]s_value)", g.Pkg["proto"], pkg+ccTypeName, ccTypeName) +} + +// And now lots of helper functions. + +// Is c an ASCII lower-case letter? +func isASCIILower(c byte) bool { + return 'a' <= c && c <= 'z' +} + +// Is c an ASCII digit? +func isASCIIDigit(c byte) bool { + return '0' <= c && c <= '9' +} + +// CamelCase returns the CamelCased name. +// If there is an interior underscore followed by a lower case letter, +// drop the underscore and convert the letter to upper case. +// There is a remote possibility of this rewrite causing a name collision, +// but it's so remote we're prepared to pretend it's nonexistent - since the +// C++ generator lowercases names, it's extremely unlikely to have two fields +// with different capitalizations. +// In short, _my_field_name_2 becomes XMyFieldName_2. +func CamelCase(s string) string { + if s == "" { + return "" + } + t := make([]byte, 0, 32) + i := 0 + if s[0] == '_' { + // Need a capital letter; drop the '_'. + t = append(t, 'X') + i++ + } + // Invariant: if the next letter is lower case, it must be converted + // to upper case. + // That is, we process a word at a time, where words are marked by _ or + // upper case letter. Digits are treated as words. + for ; i < len(s); i++ { + c := s[i] + if c == '_' && i+1 < len(s) && isASCIILower(s[i+1]) { + continue // Skip the underscore in s. + } + if isASCIIDigit(c) { + t = append(t, c) + continue + } + // Assume we have a letter now - if not, it's a bogus identifier. + // The next word is a sequence of characters that must start upper case. + if isASCIILower(c) { + c ^= ' ' // Make it a capital letter. + } + t = append(t, c) // Guaranteed not lower case. + // Accept lower case sequence that follows. + for i+1 < len(s) && isASCIILower(s[i+1]) { + i++ + t = append(t, s[i]) + } + } + return string(t) +} + +// CamelCaseSlice is like CamelCase, but the argument is a slice of strings to +// be joined with "_". +func CamelCaseSlice(elem []string) string { return CamelCase(strings.Join(elem, "_")) } + +// dottedSlice turns a sliced name into a dotted name. +func dottedSlice(elem []string) string { return strings.Join(elem, ".") } + +// Is this field optional? +func isOptional(field *descriptor.FieldDescriptorProto) bool { + return *field.Proto3Optional +} + +// Is this field required? +func isRequired(field *descriptor.FieldDescriptorProto) bool { + return field.Label != nil && *field.Label == descriptor.FieldDescriptorProto_LABEL_REQUIRED +} + +// Is this field repeated? +func isRepeated(field *descriptor.FieldDescriptorProto) bool { + return field.Label != nil && *field.Label == descriptor.FieldDescriptorProto_LABEL_REPEATED +} + +// Is this field a scalar numeric type? +func isScalar(field *descriptor.FieldDescriptorProto) bool { + if field.Type == nil { + return false + } + switch *field.Type { + case descriptor.FieldDescriptorProto_TYPE_DOUBLE, + descriptor.FieldDescriptorProto_TYPE_FLOAT, + descriptor.FieldDescriptorProto_TYPE_INT64, + descriptor.FieldDescriptorProto_TYPE_UINT64, + descriptor.FieldDescriptorProto_TYPE_INT32, + descriptor.FieldDescriptorProto_TYPE_FIXED64, + descriptor.FieldDescriptorProto_TYPE_FIXED32, + descriptor.FieldDescriptorProto_TYPE_BOOL, + descriptor.FieldDescriptorProto_TYPE_UINT32, + descriptor.FieldDescriptorProto_TYPE_ENUM, + descriptor.FieldDescriptorProto_TYPE_SFIXED32, + descriptor.FieldDescriptorProto_TYPE_SFIXED64, + descriptor.FieldDescriptorProto_TYPE_SINT32, + descriptor.FieldDescriptorProto_TYPE_SINT64: + return true + default: + return false + } +} + +// badToUnderscore is the mapping function used to generate Go names from package names, +// which can be dotted in the input .proto file. It replaces non-identifier characters such as +// dot or dash with underscore. +func badToUnderscore(r rune) rune { + if unicode.IsLetter(r) || unicode.IsDigit(r) || r == '_' { + return r + } + return '_' +} + +// baseName returns the last path element of the name, with the last dotted suffix removed. +func baseName(name string) string { + // First, find the last element + if i := strings.LastIndex(name, "/"); i >= 0 { + name = name[i+1:] + } + // Now drop the suffix + if i := strings.LastIndex(name, "."); i >= 0 { + name = name[0:i] + } + return name +} + +// 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 + // tag numbers in DescriptorProto + messageFieldPath = 2 // field + messageMessagePath = 3 // nested_type + messageEnumPath = 4 // enum_type + messageOneofPath = 8 // oneof_decl + // tag numbers in EnumDescriptorProto + enumValuePath = 2 // value +) + +var supportTypeAliases bool + +func init() { + for _, tag := range build.Default.ReleaseTags { + if tag == "go1.9" { + supportTypeAliases = true + return + } + } +} diff --git a/cmd/protoc-gen-micro/generator/name_test.go b/cmd/protoc-gen-micro/generator/name_test.go new file mode 100644 index 0000000000..f6189a779c --- /dev/null +++ b/cmd/protoc-gen-micro/generator/name_test.go @@ -0,0 +1,135 @@ +// Go support for Protocol Buffers - Google's data interchange format +// +// Copyright 2013 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 generator + +import ( + "testing" + + descriptor "google.golang.org/protobuf/types/descriptorpb" +) + +func TestCamelCase(t *testing.T) { + tests := []struct { + in, want string + }{ + {"one", "One"}, + {"one_two", "OneTwo"}, + {"_my_field_name_2", "XMyFieldName_2"}, + {"Something_Capped", "Something_Capped"}, + {"my_Name", "My_Name"}, + {"OneTwo", "OneTwo"}, + {"_", "X"}, + {"_a_", "XA_"}, + } + for _, tc := range tests { + if got := CamelCase(tc.in); got != tc.want { + t.Errorf("CamelCase(%q) = %q, want %q", tc.in, got, tc.want) + } + } +} + +func TestGoPackageOption(t *testing.T) { + tests := []struct { + in string + impPath GoImportPath + pkg GoPackageName + ok bool + }{ + {"", "", "", false}, + {"foo", "", "foo", true}, + {"github.com/golang/bar", "github.com/golang/bar", "bar", true}, + {"github.com/golang/bar;baz", "github.com/golang/bar", "baz", true}, + {"github.com/golang/string", "github.com/golang/string", "string", true}, + } + for _, tc := range tests { + d := &FileDescriptor{ + FileDescriptorProto: &descriptor.FileDescriptorProto{ + Options: &descriptor.FileOptions{ + GoPackage: &tc.in, + }, + }, + } + impPath, pkg, ok := d.goPackageOption() + if impPath != tc.impPath || pkg != tc.pkg || ok != tc.ok { + t.Errorf("go_package = %q => (%q, %q, %t), want (%q, %q, %t)", tc.in, + impPath, pkg, ok, tc.impPath, tc.pkg, tc.ok) + } + } +} + +func TestPackageNames(t *testing.T) { + g := New() + g.packageNames = make(map[GoImportPath]GoPackageName) + g.usedPackageNames = make(map[GoPackageName]bool) + for _, test := range []struct { + importPath GoImportPath + want GoPackageName + }{ + {"github.com/golang/foo", "foo"}, + {"github.com/golang/second/package/named/foo", "foo1"}, + {"github.com/golang/third/package/named/foo", "foo2"}, + {"github.com/golang/conflicts/with/predeclared/ident/string", "string1"}, + } { + if got := g.GoPackageName(test.importPath); got != test.want { + t.Errorf("GoPackageName(%v) = %v, want %v", test.importPath, got, test.want) + } + } +} + +func TestUnescape(t *testing.T) { + tests := []struct { + in string + out string + }{ + // successful cases, including all kinds of escapes + {"", ""}, + {"foo bar baz frob nitz", "foo bar baz frob nitz"}, + {`\000\001\002\003\004\005\006\007`, string([]byte{0, 1, 2, 3, 4, 5, 6, 7})}, + {`\a\b\f\n\r\t\v\\\?\'\"`, string([]byte{'\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '?', '\'', '"'})}, + {`\x10\x20\x30\x40\x50\x60\x70\x80`, string([]byte{16, 32, 48, 64, 80, 96, 112, 128})}, + // variable length octal escapes + {`\0\018\222\377\3\04\005\6\07`, string([]byte{0, 1, '8', 0222, 255, 3, 4, 5, 6, 7})}, + // malformed escape sequences left as is + {"foo \\g bar", "foo \\g bar"}, + {"foo \\xg0 bar", "foo \\xg0 bar"}, + {"\\", "\\"}, + {"\\x", "\\x"}, + {"\\xf", "\\xf"}, + {"\\777", "\\777"}, // overflows byte + } + for _, tc := range tests { + s := unescape(tc.in) + if s != tc.out { + t.Errorf("doUnescape(%q) = %q; should have been %q", tc.in, s, tc.out) + } + } +} diff --git a/cmd/protoc-gen-micro/go.mod b/cmd/protoc-gen-micro/go.mod new file mode 100644 index 0000000000..f3edb11f33 --- /dev/null +++ b/cmd/protoc-gen-micro/go.mod @@ -0,0 +1,31 @@ +module github.com/micro/go-micro/cmd/protoc-gen-micro + +go 1.17 + +require ( + go-micro.dev/v5 v5.0.1-0.20240702120614-1515db52409d + google.golang.org/genproto v0.0.0-20230306155012-7f2fa6fef1f4 + google.golang.org/protobuf v1.33.0 +) + +require ( + github.com/evanphx/json-patch/v5 v5.5.0 // indirect + github.com/felixge/httpsnoop v1.0.1 // indirect + github.com/go-acme/lego/v4 v4.4.0 // indirect + github.com/gobwas/httphead v0.1.0 // indirect + github.com/gobwas/pool v0.2.1 // indirect + github.com/gobwas/ws v1.0.4 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/go-cmp v0.5.6 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gorilla/handlers v1.5.1 // indirect + github.com/miekg/dns v1.1.43 // indirect + github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c // indirect + github.com/patrickmn/go-cache v2.1.0+incompatible // indirect + github.com/pkg/errors v0.9.1 // indirect + golang.org/x/net v0.23.0 // indirect + golang.org/x/sync v0.1.0 // indirect + golang.org/x/sys v0.18.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect +) diff --git a/cmd/protoc-gen-micro/go.sum b/cmd/protoc-gen-micro/go.sum 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h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/cmd/protoc-gen-micro/main.go b/cmd/protoc-gen-micro/main.go new file mode 100644 index 0000000000..4848188c92 --- /dev/null +++ b/cmd/protoc-gen-micro/main.go @@ -0,0 +1,99 @@ +// Go support for Protocol Buffers - Google's data interchange format +// +// 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. + +// protoc-gen-micro is a plugin for the Google protocol buffer compiler to generate +// Go code. Run it by building this program and putting it in your path with +// the name +// protoc-gen-micro +// That word 'micro' at the end becomes part of the option string set for the +// protocol compiler, so once the protocol compiler (protoc) is installed +// you can run +// protoc --micro_out=output_directory --go_out=output_directory input_directory/file.proto +// to generate go-micro code for the protocol defined by file.proto. +// With that input, the output will be written to +// output_directory/file.micro.go +// +// The generated code is documented in the package comment for +// the library. +// +// See the README and documentation for protocol buffers to learn more: +// https://developers.google.com/protocol-buffers/ +package main + +import ( + "io" + "os" + + "github.com/micro/go-micro/cmd/protoc-gen-micro/generator" + _ "github.com/micro/go-micro/cmd/protoc-gen-micro/plugin/micro" + "google.golang.org/protobuf/proto" +) + +func main() { + // Begin by allocating a generator. The request and response structures are stored there + // so we can do error handling easily - the response structure contains the field to + // report failure. + g := generator.New() + + data, err := io.ReadAll(os.Stdin) + if err != nil { + g.Error(err, "reading input") + } + + if err := proto.Unmarshal(data, g.Request); err != nil { + g.Error(err, "parsing input proto") + } + + if len(g.Request.FileToGenerate) == 0 { + g.Fail("no files to generate") + } + + g.CommandLineParameters(g.Request.GetParameter()) + + // Create a wrapped version of the Descriptors and EnumDescriptors that + // point to the file that defines them. + g.WrapTypes() + + g.SetPackageNames() + g.BuildTypeNameMap() + + g.GenerateAllFiles() + + // Send back the results. + data, err = proto.Marshal(g.Response) + if err != nil { + g.Error(err, "failed to marshal output proto") + } + _, err = os.Stdout.Write(data) + if err != nil { + g.Error(err, "failed to write output proto") + } +} diff --git a/cmd/protoc-gen-micro/plugin/micro/micro.go b/cmd/protoc-gen-micro/plugin/micro/micro.go new file mode 100644 index 0000000000..4dde590937 --- /dev/null +++ b/cmd/protoc-gen-micro/plugin/micro/micro.go @@ -0,0 +1,560 @@ +package micro + +import ( + "fmt" + "path" + "strconv" + "strings" + + "github.com/micro/go-micro/cmd/protoc-gen-micro/generator" + options "google.golang.org/genproto/googleapis/api/annotations" + "google.golang.org/protobuf/proto" + pb "google.golang.org/protobuf/types/descriptorpb" +) + +// Paths for packages used by code generated in this file, +// relative to the import_prefix of the generator.Generator. +const ( + apiPkgPath = "go-micro.dev/v5/api" + contextPkgPath = "context" + clientPkgPath = "go-micro.dev/v5/client" + serverPkgPath = "go-micro.dev/v5/server" +) + +func init() { + generator.RegisterPlugin(new(micro)) +} + +// micro is an implementation of the Go protocol buffer compiler's +// plugin architecture. It generates bindings for go-micro support. +type micro struct { + gen *generator.Generator +} + +// Name returns the name of this plugin, "micro". +func (g *micro) Name() string { + return "micro" +} + +// The names for packages imported in the generated code. +// They may vary from the final path component of the import path +// if the name is used by other packages. +var ( + apiPkg string + contextPkg string + clientPkg string + serverPkg string + pkgImports map[generator.GoPackageName]bool +) + +// Init initializes the plugin. +func (g *micro) Init(gen *generator.Generator) { + g.gen = gen + apiPkg = generator.RegisterUniquePackageName("api", nil) + contextPkg = generator.RegisterUniquePackageName("context", nil) + clientPkg = generator.RegisterUniquePackageName("client", nil) + serverPkg = generator.RegisterUniquePackageName("server", nil) +} + +// Given a type name defined in a .proto, return its object. +// Also record that we're using it, to guarantee the associated import. +func (g *micro) objectNamed(name string) generator.Object { + g.gen.RecordTypeUse(name) + return g.gen.ObjectNamed(name) +} + +// Given a type name defined in a .proto, return its name as we will print it. +func (g *micro) typeName(str string) string { + return g.gen.TypeName(g.objectNamed(str)) +} + +// P forwards to g.gen.P. +func (g *micro) P(args ...interface{}) { g.gen.P(args...) } + +// Generate generates code for the services in the given file. +func (g *micro) Generate(file *generator.FileDescriptor) { + if len(file.FileDescriptorProto.Service) == 0 { + return + } + g.P("// Reference imports to suppress errors if they are not otherwise used.") + g.P("var _ ", apiPkg, ".Endpoint") + g.P("var _ ", contextPkg, ".Context") + g.P("var _ ", clientPkg, ".Option") + g.P("var _ ", serverPkg, ".Option") + g.P() + + for i, service := range file.FileDescriptorProto.Service { + g.generateService(file, service, i) + } +} + +// GenerateImports generates the import declaration for this file. +func (g *micro) GenerateImports(file *generator.FileDescriptor, imports map[generator.GoImportPath]generator.GoPackageName) { + if len(file.FileDescriptorProto.Service) == 0 { + return + } + g.P("import (") + g.P(apiPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, apiPkgPath))) + g.P(contextPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, contextPkgPath))) + g.P(clientPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, clientPkgPath))) + g.P(serverPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, serverPkgPath))) + g.P(")") + g.P() + + // We need to keep track of imported packages to make sure we don't produce + // a name collision when generating types. + pkgImports = make(map[generator.GoPackageName]bool) + for _, name := range imports { + pkgImports[name] = true + } +} + +// reservedClientName records whether a client name is reserved on the client side. +var reservedClientName = map[string]bool{ + // TODO: do we need any in go-micro? +} + +func unexport(s string) string { + if len(s) == 0 { + return "" + } + name := strings.ToLower(s[:1]) + s[1:] + if pkgImports[generator.GoPackageName(name)] { + return name + "_" + } + return name +} + +// generateService generates all the code for the named service. +func (g *micro) generateService(file *generator.FileDescriptor, service *pb.ServiceDescriptorProto, index int) { + path := fmt.Sprintf("6,%d", index) // 6 means service. + + origServName := service.GetName() + serviceName := strings.ToLower(service.GetName()) + pkg := file.GetPackage() + if pkg != "" { + serviceName = pkg + } + servName := generator.CamelCase(origServName) + servAlias := servName + "Service" + + // strip suffix + if strings.HasSuffix(servAlias, "ServiceService") { + servAlias = strings.TrimSuffix(servAlias, "Service") + } + + g.P() + g.P("// Api Endpoints for ", servName, " service") + g.P() + + g.P("func New", servName, "Endpoints () []*", apiPkg, ".Endpoint {") + g.P("return []*", apiPkg, ".Endpoint{") + for _, method := range service.Method { + if method.Options != nil && proto.HasExtension(method.Options, options.E_Http) { + g.P("{") + g.generateEndpoint(servName, method) + g.P("},") + } + } + g.P("}") + g.P("}") + g.P() + + g.P() + g.P("// Client API for ", servName, " service") + g.P() + + // Client interface. + g.P("type ", servAlias, " interface {") + for i, method := range service.Method { + g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service. + g.P(g.generateClientSignature(servName, method)) + } + g.P("}") + g.P() + + // Client structure. + g.P("type ", unexport(servAlias), " struct {") + g.P("c ", clientPkg, ".Client") + g.P("name string") + g.P("}") + g.P() + + // NewClient factory. + g.P("func New", servAlias, " (name string, c ", clientPkg, ".Client) ", servAlias, " {") + /* + g.P("if c == nil {") + g.P("c = ", clientPkg, ".NewClient()") + g.P("}") + g.P("if len(name) == 0 {") + g.P(`name = "`, serviceName, `"`) + g.P("}") + */ + g.P("return &", unexport(servAlias), "{") + g.P("c: c,") + g.P("name: name,") + g.P("}") + g.P("}") + g.P() + var methodIndex, streamIndex int + serviceDescVar := "_" + servName + "_serviceDesc" + // Client method implementations. + for _, method := range service.Method { + var descExpr string + if !method.GetServerStreaming() { + // Unary RPC method + descExpr = fmt.Sprintf("&%s.Methods[%d]", serviceDescVar, methodIndex) + methodIndex++ + } else { + // Streaming RPC method + descExpr = fmt.Sprintf("&%s.Streams[%d]", serviceDescVar, streamIndex) + streamIndex++ + } + g.generateClientMethod(pkg, serviceName, servName, serviceDescVar, method, descExpr) + } + + g.P("// Server API for ", servName, " service") + g.P() + + // Server interface. + serverType := servName + "Handler" + g.P("type ", serverType, " interface {") + for i, method := range service.Method { + g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service. + g.P(g.generateServerSignature(servName, method)) + } + g.P("}") + g.P() + + // Server registration. + g.P("func Register", servName, "Handler(s ", serverPkg, ".Server, hdlr ", serverType, ", opts ...", serverPkg, ".HandlerOption) error {") + g.P("type ", unexport(servName), " interface {") + + // generate interface methods + for _, method := range service.Method { + methName := generator.CamelCase(method.GetName()) + inType := g.typeName(method.GetInputType()) + outType := g.typeName(method.GetOutputType()) + + if !method.GetServerStreaming() && !method.GetClientStreaming() { + g.P(methName, "(ctx ", contextPkg, ".Context, in *", inType, ", out *", outType, ") error") + continue + } + g.P(methName, "(ctx ", contextPkg, ".Context, stream server.Stream) error") + } + g.P("}") + g.P("type ", servName, " struct {") + g.P(unexport(servName)) + g.P("}") + g.P("h := &", unexport(servName), "Handler{hdlr}") + for _, method := range service.Method { + if method.Options != nil && proto.HasExtension(method.Options, options.E_Http) { + g.P("opts = append(opts, ", apiPkg, ".WithEndpoint(&", apiPkg, ".Endpoint{") + g.generateEndpoint(servName, method) + g.P("}))") + } + } + g.P("return s.Handle(s.NewHandler(&", servName, "{h}, opts...))") + g.P("}") + g.P() + + g.P("type ", unexport(servName), "Handler struct {") + g.P(serverType) + g.P("}") + + // Server handler implementations. + var handlerNames []string + for _, method := range service.Method { + hname := g.generateServerMethod(servName, method) + handlerNames = append(handlerNames, hname) + } +} + +// generateEndpoint creates the api endpoint +func (g *micro) generateEndpoint(servName string, method *pb.MethodDescriptorProto) { + if method.Options == nil || !proto.HasExtension(method.Options, options.E_Http) { + return + } + // http rules + r := proto.GetExtension(method.Options, options.E_Http) + rule := r.(*options.HttpRule) + var meth string + var path string + switch { + case len(rule.GetDelete()) > 0: + meth = "DELETE" + path = rule.GetDelete() + case len(rule.GetGet()) > 0: + meth = "GET" + path = rule.GetGet() + case len(rule.GetPatch()) > 0: + meth = "PATCH" + path = rule.GetPatch() + case len(rule.GetPost()) > 0: + meth = "POST" + path = rule.GetPost() + case len(rule.GetPut()) > 0: + meth = "PUT" + path = rule.GetPut() + } + if len(meth) == 0 || len(path) == 0 { + return + } + // TODO: process additional bindings + g.P("Name:", fmt.Sprintf(`"%s.%s",`, servName, method.GetName())) + g.P("Path:", fmt.Sprintf(`[]string{"%s"},`, path)) + g.P("Method:", fmt.Sprintf(`[]string{"%s"},`, meth)) + if method.GetServerStreaming() || method.GetClientStreaming() { + g.P("Stream: true,") + } + g.P(`Handler: "rpc",`) +} + +// generateClientSignature returns the client-side signature for a method. +func (g *micro) generateClientSignature(servName string, method *pb.MethodDescriptorProto) string { + origMethName := method.GetName() + methName := generator.CamelCase(origMethName) + if reservedClientName[methName] { + methName += "_" + } + reqArg := ", in *" + g.typeName(method.GetInputType()) + if method.GetClientStreaming() { + reqArg = "" + } + respName := "*" + g.typeName(method.GetOutputType()) + if method.GetServerStreaming() || method.GetClientStreaming() { + respName = servName + "_" + generator.CamelCase(origMethName) + "Service" + } + + return fmt.Sprintf("%s(ctx %s.Context%s, opts ...%s.CallOption) (%s, error)", methName, contextPkg, reqArg, clientPkg, respName) +} + +func (g *micro) generateClientMethod(pkg, reqServ, servName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) { + reqMethod := fmt.Sprintf("%s.%s", servName, method.GetName()) + useGrpc := g.gen.Param["use_grpc"] + if useGrpc != "" { + reqMethod = fmt.Sprintf("/%s.%s/%s", pkg, servName, method.GetName()) + } + methName := generator.CamelCase(method.GetName()) + inType := g.typeName(method.GetInputType()) + outType := g.typeName(method.GetOutputType()) + + servAlias := servName + "Service" + + // strip suffix + if strings.HasSuffix(servAlias, "ServiceService") { + servAlias = strings.TrimSuffix(servAlias, "Service") + } + + g.P("func (c *", unexport(servAlias), ") ", g.generateClientSignature(servName, method), "{") + if !method.GetServerStreaming() && !method.GetClientStreaming() { + g.P(`req := c.c.NewRequest(c.name, "`, reqMethod, `", in)`) + g.P("out := new(", outType, ")") + // TODO: Pass descExpr to Invoke. + g.P("err := ", `c.c.Call(ctx, req, out, opts...)`) + g.P("if err != nil { return nil, err }") + g.P("return out, nil") + g.P("}") + g.P() + return + } + streamType := unexport(servAlias) + methName + g.P(`req := c.c.NewRequest(c.name, "`, reqMethod, `", &`, inType, `{})`) + g.P("stream, err := c.c.Stream(ctx, req, opts...)") + g.P("if err != nil { return nil, err }") + + if !method.GetClientStreaming() { + g.P("if err := stream.Send(in); err != nil { return nil, err }") + // TODO: currently only grpc support CloseSend + // g.P("if err := stream.CloseSend(); err != nil { return nil, err }") + } + + g.P("return &", streamType, "{stream}, nil") + g.P("}") + g.P() + + genSend := method.GetClientStreaming() + genRecv := method.GetServerStreaming() + + // Stream auxiliary types and methods. + g.P("type ", servName, "_", methName, "Service interface {") + g.P("Context() context.Context") + g.P("SendMsg(interface{}) error") + g.P("RecvMsg(interface{}) error") + g.P("CloseSend() error") + g.P("Close() error") + + if genSend { + g.P("Send(*", inType, ") error") + } + if genRecv { + g.P("Recv() (*", outType, ", error)") + } + g.P("}") + g.P() + + g.P("type ", streamType, " struct {") + g.P("stream ", clientPkg, ".Stream") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") CloseSend() error {") + g.P("return x.stream.CloseSend()") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") Close() error {") + g.P("return x.stream.Close()") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") Context() context.Context {") + g.P("return x.stream.Context()") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") SendMsg(m interface{}) error {") + g.P("return x.stream.Send(m)") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") RecvMsg(m interface{}) error {") + g.P("return x.stream.Recv(m)") + g.P("}") + g.P() + + if genSend { + g.P("func (x *", streamType, ") Send(m *", inType, ") error {") + g.P("return x.stream.Send(m)") + g.P("}") + g.P() + + } + + if genRecv { + g.P("func (x *", streamType, ") Recv() (*", outType, ", error) {") + g.P("m := new(", outType, ")") + g.P("err := x.stream.Recv(m)") + g.P("if err != nil {") + g.P("return nil, err") + g.P("}") + g.P("return m, nil") + g.P("}") + g.P() + } +} + +// generateServerSignature returns the server-side signature for a method. +func (g *micro) generateServerSignature(servName string, method *pb.MethodDescriptorProto) string { + origMethName := method.GetName() + methName := generator.CamelCase(origMethName) + if reservedClientName[methName] { + methName += "_" + } + + var reqArgs []string + ret := "error" + reqArgs = append(reqArgs, contextPkg+".Context") + + if !method.GetClientStreaming() { + reqArgs = append(reqArgs, "*"+g.typeName(method.GetInputType())) + } + if method.GetServerStreaming() || method.GetClientStreaming() { + reqArgs = append(reqArgs, servName+"_"+generator.CamelCase(origMethName)+"Stream") + } + if !method.GetClientStreaming() && !method.GetServerStreaming() { + reqArgs = append(reqArgs, "*"+g.typeName(method.GetOutputType())) + } + return methName + "(" + strings.Join(reqArgs, ", ") + ") " + ret +} + +func (g *micro) generateServerMethod(servName string, method *pb.MethodDescriptorProto) string { + methName := generator.CamelCase(method.GetName()) + hname := fmt.Sprintf("_%s_%s_Handler", servName, methName) + serveType := servName + "Handler" + inType := g.typeName(method.GetInputType()) + outType := g.typeName(method.GetOutputType()) + + if !method.GetServerStreaming() && !method.GetClientStreaming() { + g.P("func (h *", unexport(servName), "Handler) ", methName, "(ctx ", contextPkg, ".Context, in *", inType, ", out *", outType, ") error {") + g.P("return h.", serveType, ".", methName, "(ctx, in, out)") + g.P("}") + g.P() + return hname + } + streamType := unexport(servName) + methName + "Stream" + g.P("func (h *", unexport(servName), "Handler) ", methName, "(ctx ", contextPkg, ".Context, stream server.Stream) error {") + if !method.GetClientStreaming() { + g.P("m := new(", inType, ")") + g.P("if err := stream.Recv(m); err != nil { return err }") + g.P("return h.", serveType, ".", methName, "(ctx, m, &", streamType, "{stream})") + } else { + g.P("return h.", serveType, ".", methName, "(ctx, &", streamType, "{stream})") + } + g.P("}") + g.P() + + genSend := method.GetServerStreaming() + genRecv := method.GetClientStreaming() + + // Stream auxiliary types and methods. + g.P("type ", servName, "_", methName, "Stream interface {") + g.P("Context() context.Context") + g.P("SendMsg(interface{}) error") + g.P("RecvMsg(interface{}) error") + g.P("Close() error") + + if genSend { + g.P("Send(*", outType, ") error") + } + + if genRecv { + g.P("Recv() (*", inType, ", error)") + } + + g.P("}") + g.P() + + g.P("type ", streamType, " struct {") + g.P("stream ", serverPkg, ".Stream") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") Close() error {") + g.P("return x.stream.Close()") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") Context() context.Context {") + g.P("return x.stream.Context()") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") SendMsg(m interface{}) error {") + g.P("return x.stream.Send(m)") + g.P("}") + g.P() + + g.P("func (x *", streamType, ") RecvMsg(m interface{}) error {") + g.P("return x.stream.Recv(m)") + g.P("}") + g.P() + + if genSend { + g.P("func (x *", streamType, ") Send(m *", outType, ") error {") + g.P("return x.stream.Send(m)") + g.P("}") + g.P() + } + + if genRecv { + g.P("func (x *", streamType, ") Recv() (*", inType, ", error) {") + g.P("m := new(", inType, ")") + g.P("if err := x.stream.Recv(m); err != nil { return nil, err }") + g.P("return m, nil") + g.P("}") + g.P() + } + + return hname +}