1、proto2 extension

proto2 extensions 官网指导说明：

https://developers.google.com/protocol-buffers/docs/proto#extensions

定义：

https://github.com/golang/protobuf/blob/4846b58453b3708320bdb524f25cc5a1d9cda4d4/internal/testprotos/proto2_proto/test.proto#L266

使用方法：

https://github.com/golang/protobuf/blob/master/proto/extensions_test.go

本文重点说明proto3，但proto3也是在proto2的基础上展开的，在理解以上链接内容可以继续向下阅读。

2、proto3 option

proto3 不支持extension，只支持option, option传值设置:

https://developers.google.com/protocol-buffers/docs/proto3#options

具体option可以分为：

FileOptions

MessageOptions

FieldOptions

OneofOptions

EnumOptions

EnumValueOptions

ServiceOptions

MethodOptions

UninterpretedOption

其字段定义见：

https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/descriptor.proto

官网也有对应使用测试：

https://github.com/protocolbuffers/protobuf/blob/master/csharp/protos/unittest_custom_options_proto3.proto

3、go代码处理proto3 option值

test.proto:

syntax = "proto3";import "google/protobuf/descriptor.proto";
import "google/protobuf/any.proto";extend google.protobuf.FileOptions {uint64 file_opt1 = 1000;
}
message mymessage{int32 x = 10;
}
extend google.protobuf.MessageOptions {mymessage mymsg = 1000 ;
}
extend google.protobuf.FieldOptions {string field_opt1 = 1000;string field_opt2 = 1001;mymessage field_opt3 = 1002;
}
extend google.protobuf.OneofOptions {int32 oneof_opt1 = 1000;
}
extend google.protobuf.EnumOptions {int32 enum_opt1 = 1000;
}
extend google.protobuf.EnumValueOptions {int32 enum_value_opt1 = 1000;
}
extend google.protobuf.ServiceOptions {sint64 service_opt1 = 1000;
}option (file_opt1) = 1;message usemymessage{option(mymsg) = {x:1} ;string field1 = 1 [(field_opt1)="field1", (field_opt2)="field1"];string field2 = 2 [(field_opt3) = {x: 100;}];oneof AnOneof{option (oneof_opt1) = 100;int32 oneofint = 3;string oneofstring = 4;}enum AnEnum {option (enum_opt1) = 100;ANENUM_UNSPECIFIED = 0;ANENUM_VAL1 = 1;ANENUM_VAL2 = 2 [(enum_value_opt1) = 100];}int32 test = 20;repeated google.protobuf.Any details = 21;
}
message usemymessagenonoption{string field1 = 1;string field2 = 2;oneof AnOneof{int32 oneofint = 3;string oneofstring = 4;}enum AnEnum {ANENUM_UNSPECIFIED = 0;ANENUM_VAL1 = 1;ANENUM_VAL2 = 2;}int32 test = 20;repeated google.protobuf.Any details = 21;
}

为了方便测试，下载了https://github.com/golang/protobuf，到proto文件家下新建test文件

把test.proto放入test文件夹内，编译命令 protoc --go_out=. *.proto 生成test.pb.go文件

编译中发现：

FieldOptions字段不可省略括号

string field1 = 1 [(field_opt1)="field1", (field_opt2)="field1"];  //field_opt1必须加括号

proto3不能显示设置option default 值

extend google.protobuf.FileOptions {
uint64 file_opt1 = 1000 [default = 100];
}

这样编译时会报Explicit default values are not allowed in proto3错，[default = 100]要删除

然后到proto/extensions_test.go 文件中加入以下测试代码：

func TestProtoOption(t *testing.T) {usm := &test.Usemymessage{Field1: "usm",Field2: "usm",}usmnonopt := &test.Usemymessagenonoption{Field1: "usm",Field2: "usm",}usmf, usmd := descriptor.ForMessage(usm)_, usmnonoptd := descriptor.ForMessage(usmnonopt)//FileOptionsif v, err := proto.GetExtension(usmf.Options, test.E_FileOpt1); err == nil {t.Logf("GetExtensions(usmf.Options, test.E_FileOpt1) file_opt1:%d", *(v.(*uint64)))} else {t.Fatalf("GetExtensions(usmf.Options, test.E_FileOpt1) failed: %v", err)}/*output:GetExtensions(usmf.Options, test.E_FileOpt1) file_opt1:1*///MessageOptionsif _, err := proto.GetExtension(usmnonoptd.Options, test.E_Mymsg); err == nil {t.Fatalf("GetExtension(usmd.Options, test.E_Mymsg) succ")} else {if err := proto.SetExtension(usmnonoptd.Options, test.E_Mymsg, &test.Mymessage{X: 100}); err != nil {t.Logf("Usemymessagenonoption can't SetExtension and GetExtension")}}if v, err := proto.GetExtension(usmd.Options, test.E_Mymsg); err == nil {t.Logf("GetExtension(usmd.Options, test.E_Mymsg) mymsg default:%v", *(v.(*test.Mymessage)))setmymsg := &test.Mymessage{X: 100}if err := proto.SetExtension(usmd.Options, test.E_Mymsg, setmymsg); err == nil {if v1, err1 := proto.GetExtension(usmd.Options, test.E_Mymsg); err1 == nil {t.Logf("GetExtension(usmd.Options, test.E_Mymsg) mymsg  after SetExtension:%v", *(v1.(*test.Mymessage)))}}} else {t.Fatalf("GetExtension(usmd.Options, test.E_Mymsg) failed: %v", err)}/*output:Usemymessagenonoption can't SetExtension and GetExtensionGetExtension(usmd.Options, test.E_Mymsg) mymsg default:{1 {} [] 0}GetExtension(usmd.Options, test.E_Mymsg) mymsg  after SetExtension:{100 {} [] 0}*///FieldOptionsfor _, field := range usmd.Field {if *(field.Name) == "field1" {if v, err := proto.GetExtensions(field.Options, []*proto.ExtensionDesc{test.E_FieldOpt1, test.E_FieldOpt2}); err == nil {t.Logf("field1 field_opt1 default:%v, field1 field_opt1 default:%v", *(v[0].(*string)), *(v[1].(*string)))} else {t.Fatalf("GetExtension(usmd.Options, []*proto.ExtensionDesc{test.E_FieldOpt1, test.E_FieldOpt2}) failed: %v", err)}}if *(field.Name) == "field2" {if v, err := proto.GetExtension(field.Options, test.E_FieldOpt3); err == nil {t.Logf("field2 field_opt3 default:%v", *(v.(*test.Mymessage)))} else {t.Fatalf("GetExtensions(field.Options, test.E_FieldOpt3) failed: %v", err)}}}/*output:field1 field_opt1 default:field1, field1 field_opt1 default:field1field2 field_opt3 default:{100 {} [] 0}*/}

protobuf 自定义extend相关推荐

js 自定义extend函数
转自:http://blog.csdn.net/openblogs/article/details/25169165 1.实现: /*** 有一个函数为extend,该函数有两个参数* arg1* a ...
给力开源，.Net开源地址大收集
一.基础类库: 1,项目名:Npoi 资源星级:★★★ (个人评的) 介绍:NPOI - 一个能帮助你直接读写office文件流的库系统教程:http://www.cnblogs.com/tonyq ...
github代码_GitHub启动代码空间
github代码 Codespaces works like a virtual Integrated Development Environment (IDE) on the cloud. 代码空间 ...
Reactor And Gev 详解通俗易懂
reactor 详解在类似网关这种海量连接, 很高的并发的场景, 比如有 10W+ 连接, go 开始变得吃力. 因为频繁的 goroutine 调度和 gc 导致程序性能很差. 这个时候我们可以考 ...
开源相关社区/项目一览
开源项目托管: http://www.apache.org/ http://www.googlecode.com/ http://www.sf.net/ http://www.github.com/ ...
[转]Google Protocol Buffers 之.Net应用
吴剑 2011-2-22 wu-jian.cnblogs.com 前言最近接到一个跨平台的测试项目,服务端Linux,是Java开发的一系列Socket接口,客户端Windows,所以准备用.Net ...
Google Protocol Buffers 之.Net应用
Google Protocol Buffers 之.Net应用吴剑 2011-2-22 原创文章,转载必需注明出处:http://www.cnblogs.com/wu-jian/ 前言最近接到一个 ...
C++微服务RPC框架，一文带你彻底搞懂 RPC
RPC(Remote Procedure Call),是一个大家既熟悉又陌生的词,只要涉及到通信,必然需要某种网络协议.我们很可能用过HTTP,那么RPC又和HTTP有什么区别呢?RPC还有什么特点, ...
PHP简易实现批量生成html静态页面
PHP简易实现批量生成html静态页面大家好,我骇Yangrl. 原来哈起一坨(蠢萌),写了页面以后,复制十份,挨着改里面的文本,imp,url等内容,做成十张页面(类似新闻详情页啊,商品详情页等) ...

protobuf 自定义extend

1、proto2 extension

2、proto3 option

3、go代码处理proto3 option值

protobuf 自定义extend相关推荐

最新文章

热门文章

protobuf 自定义extend

1、proto2 extension

2、proto3 option

3、go代码 处理proto3 option值

protobuf 自定义extend相关推荐

最新文章

热门文章

3、go代码处理proto3 option值