Proto2 vs proto3

Protobuf backward compatibility and proto3 vs proto

Yes, if some of your systems are proto2 based, it is probably best to keep using proto2. In my opinion, proto3 does not introduce many new features and most libraries will continue supporting proto2. In my opinion, proto3 does not introduce many new features and most libraries will continue supporting proto2 Though AMPS supports both Proto2 and Proto3, Proto2 is more feature rich due to restrictions of the message type. Both versions of protobuf have their advantages and disadvantages, and the best choice really does come down to the needs of your application. If you are already successful with Proto2 and do not require a feature added in Proto3, then you should stick with Proto2. If you're just starting out with Protobuf and the restrictions don't affect you, then you should. If you can use proto3, I'd suggest using proto3 version, partly as it will have proper support whereas the proto2 version is basically in maintenance mode. There are significant differences between the two, primarily in terms of mutability - the generated message classes in the proto3 codebase are mutable, which is great for immediate usability, but can pose challenges in other areas

Protobuf: Battle of the Syntaxe

Any differences between proto2 and proto3 generated code are highlighted - note that these differences are in the generated code as described in this document, not the base message.. MTH Proto2 vs. Proto3 in conventional. B brr Member. I'm considering purchasing a MTH proto2 engine. I run conventional and TMCC, and don't much care for sounds. Is there any advantage for my situation to purchase the same engine for more money with proto3? 10/31/148:49 PM. Share on Facebook; Share on Twitter ; Share on Pinterest; Share on LinkedIn; Share on Reddit; Copy Link to Topic; Report. Originally, proto3 messages always discarded unknown fields during parsing, but in version 3.5 we reintroduced the preservation of unknown fields to match the proto2 behavior. In versions 3.5 and.. The current version (at the time of this post) of protocol buffers, is Proto2. The latest version, Proto3, includes several improvements over its predecessor. The biggest addition is the new map..

Proto3 is the latest version of Protocol Buffers and includes the following changes from proto2: Field presence, also known as hasField, is removed by default for primitive fields. An unset.. However, as there are potential compatibility issues between clients and servers generated with proto2 and proto3, we recommend that you use proto3 for defining gRPC services. You can find out more.. Proto2 vs proto3. The version of the protocol buffer format is set in the first line of the file: syntax=proto2; Proto2 and proto3 are two commonly-used versions of protocol buffers. They both use the same wire format but the definition files are not compatible. Key differences between the two versions include the following: The optional and required keywords are no longer allowed in proto3. The proto2 API provides a Has method for every optional field that makes it easy to test whether a value has been explicitly supplied. This has not been carried over to the Proto3 format, though there is a workaround that makes it possible. The example below shows a Proto2 message containing a single field with a default value of ten If you can use proto3, I'd suggest using proto3 version, partly as it will have proper support whereas the proto2 version is basically in maintenance mode

.net - Proto2 vs. Proto3 in C# - Stack Overflo

  1. Proto2 and proto3 are wire compatible. The same construct in proto2 and proto3 will have the same binary representation. If your proto only uses features available in both proto2 and proto3, systems built with proto2 should be able to communicate with systems built with proto3 without any problem (it's also true vice versa). Post by Mike Heffner Hi, I haven't been able to find any.
  2. Protobuf 的 proto3 与 proto2 的区别 (转) 在第一行非空白非注释行,必须写: syntax = proto3; 字段规则移除了 required,并把 optional 改名为 singular 1 ; 在 proto2 中 required 也是不推荐使用的。proto3 直接从语法层面上移除了 required... repeated字段默认采用 packed 编码; 在 proto2 中,需要明确使用 [packed=true] 来为字段指定比较紧凑的 packed 编码方式。 语言增加 Go、Ruby、JavaNano 支持; 移除了.
  3. Just like PS-2 3V replaced the very early and first PS-2 5V boards. Basically PS-3 gives more memory for sound files, more features, LED lights versus Bulbs, No battery, DCS and DCC capability, Ability to detect DCS on any rail when 2R-3R engine, and some other stuff on the tech side. It is the last from MTH and what is supported the easiest
  4. It is like you have to continue to use proto2. If you start using proto3, you can't talk to older systems, or have to rewrite, recompile all those .protos That is compatibility break in the first place. All answers to this question, which has the identifier 40680273. The best answer: Yes, if some of your systems are proto2 based, it is probably best to keep using proto2. In my opinion, proto3.

In general, while you can use proto2 (the current default protocol buffers version), we recommend that you use proto3 with gRPC as it lets you use the full range of gRPC-supported languages, as well as avoiding compatibility issues with proto2 clients talking to proto3 servers and vice versa Proto2とProto3の違いを色々と見てきましたが、2と3で設計思想が大きく変わっているように思います。2はお節介にいろいろやってくれて便利だけど使い道によってはやり過ぎで性能を犠牲にしてしまう可能性がある。3は割り切って基本の「データをシリアライズする」というところにフォーカスして効率化をしているという印象でした。その分、細かいところのチェック. 总的来说,proto3 比 proto2 支持更多语言但 更简洁。去掉了一些复杂的语法和特性,更强调约定而弱化语法。如果是首次使用 Protobuf ,建议使用 proto3 。 在第一行非空白非注释行,必须写: syntax = proto3; 字段规则移除了 required,并把 optional 改名为 singular 1 ; 在 proto2 中 required 也是不推荐使用的。proto3 直接从语法层面上移除了 required 规则。其实可以做的更.

Proto3简化了proto2的开发,提高了开发的效能,但是也带来了版本不兼容的问题。 目前Protobuf的稳定版本是3.9.2,于2019年9月23日发布。 由于很多公司很早的就采用了Protobuf,所以很多项目还在使用proto2协议,目前是proto2和proto3同时在使用的状态 The proto compiler does allow a mix of proto2 and proto3 syntax files -- proto3 files can import proto2 files (though I can't recall if the other direction is allowed -- I think it is though, to support custom options that might reference messages defined in proto3). One path for migration is to start using proto3 for all new files. This gives you optionality as far as how and when to convert. Protocol Buffers (Protobuf) is a free and open source cross-platform library used to serialize structured data. It is useful in developing programs to communicate with each other over a network or for storing data. The method involves an interface description language that describes the structure of some data and a program that generates source code from that description for generating or. Qiita is a technical knowledge sharing and collaboration platform for programmers. You can record and post programming tips, know-how and notes here Proto2 vs proto3. Protobuf: Battle of the Syntaxes, Proto2 vs. Proto3 · Required message fields. This can be useful for things like SOW keys. · Ability to set custom default values for a field. · Ability to In the Proto3 syntax, everything is optional. If you do not provide a syntax, Proto2 will be used and a warning similar to the following will be displayed in the log file. No syntax.

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Protocol Buffers language version 3 (aka proto3) was released at Jul 2016, which is not compatible to previous version. Proto3 simplifies the protocol buffer language, both for ease of use and to make it available in a wider range of programming languages: our current release lets you generate protocol buffer code in Java, C++, Python, Java Lite, Ruby, JavaScript, Objective-C, and C# I took the problem message structure and created a new file with the syntax set to proto2 instead of proto3. Simples! syntax=proto2; package main; message Register { required bytes uuid = 1; The addition of the required keyword is the magic foo. It even works :-) If there is a better solution, feel free to let me know! Previous... Remote VS Code on FreeBSD. I've been using VSCode as my. I believe this is due to the descriptor.proto file having outdated proto2 syntax. Here is how I tested this: Create a test .proto file. syntax = proto3; package project; option go_package = .;project; message Test { string data = 1; } Generate the .pb.go file with protoc. (I. The variable syntax refers to the version of the Protobuf used, which can be proto2 or proto3. Versions 2 and 3 have important differences, but we will only address version 2 in this post. For more information about version 3, see the official documentation

Java Serialization Vs Protocol Buffers Python - lasopaspin

Re: [protobuf] Default Values vs Missing Values, Each field may be omitted but the default value of the type will be used then. In contrast to protobuf2 there is no way in protobuf3 to mark some fields person. proto syntax = proto3; package main; message Person { int32 So in proto3, hasX() can tell if a message field is set or not, and getX() will return the default instance of the proto if. Using proto2 vs. proto3 Protocol buffers have two syntax versions: proto2 and proto3. One key feature in proto2 is that it differentiates between required and optional fields, and supports nullable fields. In proto3, all fields are optional and nullable fields are no longer supported. If a field is unset, it will be set to a default value e.g. empty string for type string. Because of this. Re: [protobuf] Default Values vs Missing Values. Ilia Mirkin. 3/26/16 11:47 AM. Use proto2, which has the has_* checks per field. (Using get_* you. still get the default value, of course.) It's extremely unfortunate. that this functionality was removed in proto3, I see that making. proto3 unattractive for all but the simplest uses of protos However, you must explicitly specify the proto3 standard on the first non-empty line of your .proto file (to quote the specification) otherwise your .proto file will be parsed using the proto2 specification. Specifying that your file uses proto3 looks like this: syntax = proto3; Messages and C# Classes Using the proto3 specification, a message format for customer information might look.

The most significant part of this is proto3, which ties into the 3.0.0 version of Protocol Buffers - released by Google at the end of July 2016. There are a few reasons why I haven't looked at this for protobuf-net before now, including: zero binary format changes; so ultimately, even without any library or tooling changes: everything that can be done in proto2 can be done in proto3. VSCode Commands. By default ctrl-shift-p opens the command prompt. Command. Description. proto3: Compile All Protos. Compiles all workspace protos using configurations defined with protoc.options. proto3: Compile This Proto. Compiles the active proto using configurations defined with protoc.options JSON vs Protocol Buffer Simplified. sakshi chahal . Jun 11, 2019 · 3 min read. Source: Google. Data serialization is the process of converting structured data to a format that allows sharing or storage of the data in a form that allows recovery of its original structure. Data De-serialization is the exact opposite. Various Data Serialization formats include XML, CSV, YAML, JSON, Protobuf etc. Since the DSL tools accept proto2 or proto3 syntax, it makes sense that we should be able to emit both proto2 and proto3 syntax, so there are now overloads of GetSchema / GetProto<T> that allow this. These tools have also been updated to be aware of maps, Timestamp, Duration etc. New custom option DSL support . The new DSL tooling makes use of the extensions feature to add custom syntax. support for proto3 'optional' is coming in protobuf 3.12 Hi there, I wanted to give you a heads-up that protobuf 3.12 is adding experimental support for optional in proto3, with a goal of making it generally available in protobuf 3.13

By default the syntax is proto2 so we have to define our syntax; We create a message definition with three fields containing (name/value pairs), one for each piece of data that you want to include in the message. Each field in the message definition has a unique number (e.g. 1, 2, 3) We look at the type (e.g. a string), then a UTF-8 encoding of the string, then a variable-length encoding. For projects that support PackageReference, copy this XML node into the project file to reference the package. paket add Google.Protobuf --version 3.12.0. The NuGet Team does not provide support for this client. Please contact its maintainers for support. #r nuget: Google.Protobuf, 3.12.0. #r directive can be used in F# Interactive, C#. Minor nit, but not necessarily. For basically all values of SomeMessage, dec should fail to parse due to improperly encoded UTF8 data for field 2 (modulo some proto2 vs. proto3 and language binding implementation differences). Change field 2 to a bytes field instead of a string field and then yes. [- 自proto3开始, proto2和proto3就可以支持map. ##官方文档中有如下声明:## Added support for map fields (implemented in both proto2 and proto3). Map fields can be declared using the following syntax: >message Foo { map<string, string> values = 1; } The data of a map field is stored in memory as an unordered map an Index. Protocol Buffers are a language-neutral, platform-neutral, extensible way of serializing structured data for use in communications protocols, data storage, and more, originally designed at Google ().. protobuf.js is a pure JavaScript implementation with TypeScript support for node.js and the browser. It's easy to use, blazingly fast and works out of the box with .proto files

MTH Proto2 vs. Proto3 in conventional O Gauge ..

Added 'syntax = proto2;' to all proto files (PR #17) Updated Travis CI script to test against both versions 2 and 3 using custom-built .deb packages of version 3 (PR #16) Improved build system with support for custom CXXFLAGS (Craig Radcliffe in PR #15) Changes in RProtoBuf version 0.4.4 (2016-07-10 In the first line of the proto file, we define whether we're using Proto2 or 3. In this case, we're using Proto3. The most uncommon elements of proto files are the numbers assigned to each entity of a message. Those dedicated numbers make each attribute unique and are used to identify the assigned fields in the binary encoded output. One important concept to grasp is that only values 1-15.

In the proto2 version of Protobuf, there were rules like required, optional, and repeated that were to be added before the field type or data type. This was optimized in proto3 and only the repeated rule is kept. A field is said to be repeated if the field represents an array of elements of the same type. If the field isn't repeated, no rules should be added. Field types. The data types a. Table 1: Comparison between proto2 and proto3. It is hard to make a decision on which version of protocol buffers to use. As mentioned above in the comparison table (Table 1), there are some backward incompatible changes from proto2 to proto3. So, it is better not to update if the gRPC services are built already with proto2. If we would like to use features like setting custom default values. I think the rust-protobuf's proto2 output is a lot grosser than its proto3 output.] I haven't tried prost yet. Maybe I should. I see it doesn't support reflection. That's a disadvantage if you need reflection, of course. But it's an advantage if you don't, because I think the reflection support is a large. proto3 is the syntax version of proto file. If we don't specify this then by default it will consider proto2 as syntax version. csharp_namespace is an optional line. When code will be generated by proto3 compiler, then all classes will be created under this namespace. message Person and Address both are different types of data structures. When code will be generated by protobuf compiler, two.

Although the above definition of a protocol format is simple, there's a lot covered. The first line explicitly states that I'm using proto3 instead of the assumed default proto2 that is currently. proto3 makes a number of changes aimed (as I understand it) at making it far more usable in cross-platform scenarios. Explicit tracking of assigned vs not assigned but reporting the default value can be very hard to implement on some of the target platforms, and can also be confusing to use. As such, proto3 adopts a much simpler approach I wrote about boosting performances by choosing the right serialization in .NET projects. The top best performing according to my tests and many of the online comparisons are Apache Avro and Google Protocol Buffer (Protobuf) serialization. If you have anything to do with any of the Google's service you might have to deal with Google Protobuf probably Minor nit, but not necessarily. For basically all values of SomeMessage, dec should fail to parse due to improperly encoded UTF8 data for field 2 (modulo some proto2 vs. proto3 and language binding implementation differences). Change field 2 to a bytes field instead of a string field and then yes

Language Guide (proto3) Protocol Buffers Google Developer

Proto2 vs. Proto3. The Proto2 and Proto3 syntaxes are quite similar, but have some distinct differences. To begin this comparison, I'm going to highlight some of the features of Proto2 that are not present in Proto3. These features include, but are not limited to: Required message fields. This can be useful for things like SOW keys. Ability to set custom default values for a field. Ability. proto3 was designed to be a simplification of proto2 schemas. It removed several features such as extensions and field presence. Each .proto file specifies whether it is a proto2 or proto3 schema. Protobuf 3.0 added several features such as maps, but these features were added to both proto2 and proto3 schemas. Sorry this is kind of confusing Syntax proto2: message SearchRequest { required string query 214 protocol-buffers grpc proto3 6 . Was sind die Hauptunterschiede zwischen Apache Thrift, Google Protocol Buffers, MessagePack, ASN.1 und Apache Avro? All dies bietet binäre Serialisierung, RPC-Frameworks und IDL. Ich interessiere mich für wichtige Unterschiede zwischen ihnen und Merkmalen (Leistung, Benutzerfreundlichkeit. Protobuf协议文件定义选择版本 syntax 声明可以选择protobuf的编译器版本(v2和v3) syntax=proto2;选择2版本,各个字段必须明确标注编号以确定序列化后二进制数据字段的位置 syntax=proto3;选择3版本,没有强制使用字段编号 字段修饰符 required 对于required的字段而言,编号初值是

1) initially generate proto3 syntax 2) then add an option to generate proto3 or proto2 syntax (apart from changing the syntax statement, the only change needed should be to add optional before every field type that isn't marked repeate New Protobuf messages created for .NET apps should follow the Protobuf style guidelines. . NET tooling automatically generates .NET types that use .NET naming standards. For example, a first_name Protobuf field generates a FirstName .NET property. In addition to a name, each field in the message definition has a unique number - proto2.jpg - proto3.jpg - red line.theme Download free. without registration through 27 sec. or download without waiting. Windows 7 themes. Launa; 7 January 2021 20:56; 2 984; 3; 2; Collections Add. 47. Dark themes for Windows 7. 14. Transparent Aero themes for Windows 7. 5. Red themes for Windows 7. More publications . Lion 7 Mac OS. Windows 10. Aero Blue. BMW. Photoshop CC 2014. Soft Glass. The tooling package Grpc.Tools is required to generate the C# assets from *.proto files. The generated assets (files): Are generated on an as-needed basis each time the project is built. Aren't added to the project or checked into source control. Are a build artifact contained in the obj directory

Windows 下在VS2019中安装C++、和Python,版本的protobuf安装教程。(史上最详细) - 灰

Proto3 vs Proto2. 由于Protocol Buffers在开源前,已经在Google内部得到广泛使用,并且已经是Proto2版本,因此一开源就采用的是Proto2版本。 后来优化和改进的Proto3相对于Proto2,更加易用,并且支持更加广泛的语言。 选择Proto3的原则: 采用只有Proto3支持的language; 使用新. >> proto2 VS proto3. 위 예제에서는 첫줄에 syntax = proto3을 지정해줌으로써 proto version 3의 규약을 따르겠다고 선언했다. 이를 명시하지 않으면 default로 version2 문법을 따르게 된다. 아래와 같이 지원 언어도 다르지만, message 작성시 field rule 지정 등 문법에서도 차이가 나타난다. - Proto2 지원 언어: C++, Java. 自定义选项. 生成访问类. 英文: Proto Buffers Language Guide. 本指南描述了怎样使用protocol buffer 语法来构造你的protocol buffer数据,包括.proto文件语法以及怎样生成.proto文件的数据访问类。. (本文只针对proto2的语法) 本文是一个参考指南——如果要查看如何使用本文中. Benchmark gRPC vs. REST mit kleinen Objektgrößen Der Wert proto3 in syntax be-schreibt die aktuelle Version des Protocol Buffer. Auch wenn die Vorgängerversion proto2 teilweise noch unterstützt wird, sollte diese nicht mehr verwen - det werden. Auffällig ist die Angabe der Zahlen: Die Feldbezeichnun-gen wie Id und CategoryName werden nicht mit serialisiert. Daher bedarf es dieser.


Just add the NuGet package to your VS project. The old code only supported proto2; the new code only supports proto3 (so no unknown fields, no required/optional distinction, no extensions) The old code was based on immutable message types and builders for them; The old code did not support maps or oneof; The old code had its own JSON representation, whereas the new code uses the standard. Proto-Sound 3.0 Upgrade Program Overview. M.T.H. will offer generic Proto-Sound 3.0 Upgrade Kits for sale on its website directly to the consumer. The initial introductory suggested retail price for the generic kit will be $179.95. Members of the M.T.H. Railroaders Club will also be permitted to order the kits directly from M.T.H. at $149.95 Additionally, it's not possible to write an exhaustive switch statement over proto3 enum types without referencing special sentinel enumerators that should be considered internal implementation details of the protobuf tools. Exhaustive switch statements on proto2 enum types that you own (or whose owners guarantee will never be moved to proto3 and will never have new enumerators added) are. Es gibt mittlerweile drei Versionen, die nicht miteinander kompatible sind: Google intern (<2008), proto2 und proto3. Die Entwurfsziele für Protobuf sind Einfachheit und Leistung. Protobuf wurde so konzipiert, dass es kleiner und schneller ist als XML und JSON. XML und JSON sind nicht für den Datenaustausch zwischen zwei verschiedenen Plattformen optimiert. Protocol Buffers bietet viele.

Go Protocol Buffers!

Protobuf向后兼容性和proto3与proto2. Protobuf的卖点之一是向后兼容性,即开发人员可以演进格式,并且老客户端仍然可以使用它。. Protobuf向后兼容性和proto3与proto2. 现在有了一个名为proto3的新Protobuf版本,IDL语言本身并不兼容,例如 options, required 其中丢弃了新的enuns. Languages Types vs Protobuf Types gRPC Basics Setup Service Implementation . Server Launch Client Launch Introduction Protocol Buffers is a combination toolset and format that facilitates the storing and transferring of data in a platform neutral way. It's similar to formats like JSON/YAML/XML, except that it's been specifically optimized for transferring data: faster to serialize.

Protocol Buffers v3 Cloud APIs Google Clou

// 最优情况是能判定出pb文件是proto2还是proto3。 // 但是pb文件里似乎并没有这种信息,所以proto2和proto3的库选择上只能二选一了。 switch ( f - > type ) { // 就是这里获取到field之后需要看看是否是数字类型,如果是数字类型,那么默认的repeated字段要改为packed类型 本文分享自微信公众号 - . Golang语言社区(Golangweb),作者:花间隐虎 原文出处及转载信息见文内详细说明,如有侵权,请联系 . yunjia_community@tencent.com 删除。. 原始发表时间:. 2017-05-03 本文参与腾讯云自媒体分享计划,欢迎正在阅读的你也加入,一起分享 Se você quer o valor padrão do Proto2 e o comportamento set / unset, você deve voltar para o Proto2. É improvável que o Proto2 desapareça tão cedo, pois muitos códigos (inclusive dentro do Google) ainda dependem dele, e compartilha a maior parte de sua implementação com o Proto3. Pense em proto2 vs. proto3 como uma opção (a opção exata que você está procurando, na verdade) ao. A new Go API for Protocol Buffers. Joe Tsai, Damien Neil, and Herbie Ong 2 March 2020 Introduction. We are pleased to announce the release of a major revision of the Go API for protocol buffers, Google's language-neutral data interchange format. Motivations for a new AP

Language Guide Protocol Buffers Google Developer

Ich verwende vor kurzem gRPCmit proto3, und ich habe das bemerkt requiredund optionalwurde in neuer Syntax entfernt. Würde jemand freundlich erklären, warum erforderliche / optionale in proto3 entfernt werden? Solche Einschränkungen scheinen nur notwendig zu sein, um die Definition robust zu machen. Syntax proto2: message SearchRequest { required string query 214 protocol-buffers grpc. Proto3整体似乎更倾向于简单,而required的删除更为简单。 但也许更有说服力,删除required与proto3结合其他功能时有意义,例如删除原语的字段存在和删除重写的默认值。 我不是一个protobuf开发者,在这个问题上我没有权威,但我仍然希望这个解释很有用 syntax = proto3; //指定版本,必须要写(proto3、proto2) package proto; enum FOO { X = 0; }; //message是固定的。UserInfo是类名,可以随意指定,符合规范即可 message UserInfo{ string message = 1; //消息 int32 length = 2; //消息大小 int32 cnt = 3; //消息计数 } client_protobuf.go package main import ( bufio fmt net os stProto proto time. proto2まではoptionalを使用してデフォルト値を設定していたようですが、proto3からはデフォルトでoptionalが適用されているそうで、何もしなければデフォルト値が入ってしまうということです

Protocol BufferとMessage Packはよく比較されますが、それぞれの公式サイトに記載されているこいつはなんぞやについての説明文(上記)の一文目を読むと、その根底が違うことが端的に表れているように思う。. Protocol Bufferはあくまで データの構造化 に重きを. 二、Protobuf协议文件(proto3)指南. ProtoBuf 有两个语言版本:v2 与 v3,截止目前在使用 v3 的时候,需要在 *.proto 文件首行中明文标识syntax=proto3; 否则默认为 syntax=proto2; 推荐使用最新的syntax = proto3;语法。 三、如何将.proto文件生成C#类文件 . 1、方法一:protogen - npm cnmp install -g protogen https://www.npmjs.com. 但它不再支持C#的proto2,只支持proto3。 我不知道我應該使用哪個項目。看起來新的支持將得到更好的支持(如果其他團隊進行升級,則可以支持proto3)。但是我必須將我從proto2提供的.proto文件轉換爲proto3,並冒任何與此相關的問題 CSDN问答为您找到proto3 default相关问题答案,如果想了解更多关于proto3 default技术问题等相关问答,请访问CSDN问答

Define annotations, fidelity parameters, and setting

Google. Protobuf 3.12.0-rc2. C# runtime library for Protocol Buffers - Google's data interchange format. This is a prerelease version of Google.Protobuf. There is a newer version of this package available. See the version list below for details. For projects that support PackageReference, copy this XML node into the project file to reference. 项目中有用到 protobuf 作跨平台的通信 , 自己也想写个demo学习实践一下, 于是有了本文。 *这个demo是基于java开发的 1.系统环境 Windows 2.所需软件和lib 1). protoc.exe 2). protobuf-java-2.4.1.jar 3.demo简介 很简单的程序,基于java开发。功能是客户端把 消息(手机信息) 发送给 服务端 Statement syntax = proto3;, artinya adalah versi proto yang digunakan adalah proto3. Ada juga versi proto2, namun kita tidak menggunakannya. Statement package model;, digunakan untuk menge-set nama package dari file yang nantinya di-generate. File user.proto akan di-compile, menghasilkan file user.pb.go. File Go tersebut package-nya adalah sesuai dengan yang sudah didefinisikan di statement. Protobuf 的格式. Protobuf的格式為proto,目前有 proto2、proto3 兩種版本, 兩者有一些差異,主要為proto3閹割掉了一些較不嚴謹的功能。 這邊用法上會以proto3為主

Handling Protocol Buffers backwards compatibility between

Маловероятно, что Proto2 уйдет в ближайшее время, так как от него все еще зависит много кода (в том числе внутри Google), и он разделяет большую часть своей реализации с Proto3. Подумайте о proto2 vs. proto3 как опцию (точную опцию.

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