From ab173f761859a2b737e5ecb568f7ccc60b1855c7 Mon Sep 17 00:00:00 2001 From: sunface Date: Sun, 23 Jan 2022 13:56:24 +0800 Subject: [PATCH 1/4] =?UTF-8?q?update=20book=20toc,=20add=E9=81=BF?= =?UTF-8?q?=E5=85=8D=E5=85=A5=E9=97=A8=E5=88=B0=E6=94=BE=E5=BC=83?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- book/contents/SUMMARY.md | 12 +++-- book/contents/async/tokio/intro.md | 1 - book/contents/sth-you-should-not-do.md | 61 +++++++++++++++++++++++ book/contents/test/intergration.md | 2 + book/contents/{async => }/tokio/basic.md | 0 book/contents/tokio/intro.md | 1 + book/contents/{async => }/tokio/stream.md | 0 book/writing-material/posts/wasm.md | 1 + 8 files changed, 73 insertions(+), 5 deletions(-) delete mode 100644 book/contents/async/tokio/intro.md create mode 100644 book/contents/sth-you-should-not-do.md rename book/contents/{async => }/tokio/basic.md (100%) create mode 100644 book/contents/tokio/intro.md rename book/contents/{async => }/tokio/stream.md (100%) diff --git a/book/contents/SUMMARY.md b/book/contents/SUMMARY.md index 9d65e075..b9f21b68 100644 --- a/book/contents/SUMMARY.md +++ b/book/contents/SUMMARY.md @@ -2,6 +2,7 @@ [进入Rust编程世界](into-rust.md) [关于本书](about-book.md) +[避免从入门到放弃](sth-you-should-not-do.md) ## Getting started @@ -100,9 +101,10 @@ - [同时运行多个Future](async/multi-futures-simultaneous.md) - [一些疑难问题的解决办法](async/pain-points-and-workarounds.md) - [实践应用:Async Web服务器](async/web-server.md) - - [tokio todo](async/tokio/intro.md) - - [基本用法](async/tokio/basic.md) - - [异步消息流](async/tokio/stream.md)) + +- [tokio使用指南](tokio/intro.md) + - [基本用法](tokio/basic.md) + - [异步消息流](tokio/stream.md)) - [Rust最佳实践 doing](practice/intro.md) - [日常开发三方库精选](practice/third-party-libs.md) @@ -139,7 +141,9 @@ - [奇怪的序列x..y](pitfalls/weird-ranges.md) - [无处不在的迭代器](pitfalls/iterator-everywhere.md) - [线程间传递消息导致主线程无法结束](pitfalls/main-with-channel-blocked.md) - + +- [如何实现一个链表]() + - [进阶类型转换](converse/intro.md) - [枚举和整数](converse/enum-int.md) diff --git a/book/contents/async/tokio/intro.md b/book/contents/async/tokio/intro.md deleted file mode 100644 index f07cf621..00000000 --- a/book/contents/async/tokio/intro.md +++ /dev/null @@ -1 +0,0 @@ -# 定海神针-tokio包 diff --git a/book/contents/sth-you-should-not-do.md b/book/contents/sth-you-should-not-do.md new file mode 100644 index 00000000..236b1b69 --- /dev/null +++ b/book/contents/sth-you-should-not-do.md @@ -0,0 +1,61 @@ +# 避免从入门到放弃 +很多人都在学Rust ing,也有很多人在放弃 ing。想要顺利学完 Rust,大家需要谨记本文列出的内容,否则这极有可能是又又又一次从入门到放弃之旅。 + +Rust 是一门全新的语言,它会带给你前所未有的体验,提升你的通用编程水平,甚至于赋予你全新的编程思想。在此时此刻,大家可能还半信半疑,但是当学完它再回头看时,可能你也会认同这些貌似浮夸的赞美。 + +## 避免试一试的心态 +在学习Go、Python等编程语言时,你可能会一边工作,一边轻松愉快的学习它们,但是Rust不行。原因如文章开头所说,在学习Rust的同时你会收获很多语言之外的知识,因此 Rust 在入门阶段比很多编程语言要更难,但是一旦入门,你将收获一个全新的自己,成为一个更加优秀的程序员。 + +在学习过程中,一开始可能会轻松愉快,但是在开始Rust核心概念时(所有权、借用、生命周期、智能指针等),难度可能会陡然提升,此时就需要认真对待起来,否则会为后面埋下很多难以填补的坑,结果最后你可能只有两个选择:重新学一遍 or 放弃。 + +因此,在学习过程中,给大家三点建议: +- 要提前做好会遇到困难的准备,因为如上面所说,学习Rust不仅仅是在学习一门编程语言 +- 不要抱着试一试的心态去试一试,否则是浪费时间和消耗学习的激情,作为连续六年全世界最受喜欢的语言,Rust不仅仅是值得试一试 :) +- 深入学习一本好书或教程 + +总之, Rust 入门难,但是在你一次次克服艰难险阻的同时,也一次次收获了与众不同的编程经验,最后历经九九八十一难,立地成大佬。 给自己一个机会,也给 Rust 一个机会 :) + +## 深入学习一本好书 +Rust跟其它语言不一样,你无法看了一遍语法,然后就能上手写代码,对,我说的就是对比 Go 语言,后者的简单易用是有目共睹的。 + +这些年,我遇到过太多在网上看了一遍菜鸟教程(或其它简易教程)就上手写demo甚至项目的同学,无一例外,都各种碰壁、趟坑,最后要么放弃,要么回炉重造,之前的时间和精力基本等同浪费。 + +因此,大家一定要舍得投入时间,沉下心去读一本好书,这本书会带你深入浅出地学习使用Rust所需的各种知识,还会带你提前趟坑,这些坑往往是需要大量的时间才能领悟的。 + +在以前我可能会推荐看官方那本书的英文原版 + async book + nomicon这几本书的组合,但是现在有了一本更适合中国用户的书籍,那就是 [<>](https://github.com/sunface/rust-course),内容好坏大家一读即知,光就文字而言,那绝对是行云流水般的阅读体验,可以极大提升你的学习效率,也不再因为反复读也读不懂一句话而烦闷不堪。 + +## 千万别从链表或图开始练手 +CS课程中我们会学习大量的常用数据结构和算法,因此大家都养成了一种好习惯:学习一门新语言,先用它写个链表或图试试。 + +我的天,在Rust中千万别这么干,你是在扼杀自己之前的努力!因为不像其它语言,链表在Rust中简直是地狱一般的难度,我见过太多英雄好汉难过链表关,最终黯然退幕。我不希望正在阅读此文的你也成为其中一个 :( + +这些自引用类型的数据结构(包含了字段,该字段又引用了自身),它们是恶魔,它们不仅仅在蹂躏着新手,还在折磨着老手,有意思的是,它们的难恰恰是Rust的优点导致的:无gc也无手动内存管理,内存安全。 + +这两点的实现并不是凭空产生的,而是通过Rust一套非常强大、优美的机制提供了支持,这些机制一旦你学到,就会被它巧妙的构思和设计而征服,进而被 Rust 深深吸引!但是一切选择都有利弊,这种机制的弊端就在于实现链表这种数据结构时,会变得非常非常复杂。 + +你需要糅合各种知识,才能解决这个问题,但是这显然不是一个新手应该独自去面对的。总之,不会链表对于Rust的学习和写项目,真的没有任何影响,直接使用大神已经写好的数据结构包就可以。 + +如果想要练手,我们可以换个方向开始,当然如果你就是喜欢征服困难,那没问题,就从链表开始。但是无论选择哪个,之前提到的那本书都会给你莫大的帮助,包括如何实现一个链表! + +## 仔细阅读编译错误 +在一些编程语言中,你可能习惯了编译器给出的错误只要看前面(或后面)几行就行,大部分是不怎么用到的信息,总之编译器总感觉笨笨的。 + +但是 Rust 不是,它为我们提供了一个强大无比的编译器,而且会提示我们该如何修改代码以解决错误,简直就是一个优秀的老师! + +因此在使用 Rust 过程中,如果错误你不知该如何解决,不妨仔细阅读下编译器或者IDE给出的错误提示,绝大多数时候,你都可以通过这些提示顺利的解决问题。 + +同时也不要忽略编译器给出的警告信息(warnings),因为里面包含了 `cargo clippy` 给出的 `lint` 提示,这些提示不仅仅包含代码风格,甚至包含了一些隐藏很深的错误!至于这些错误为何不是 `error` 形式出现,随着学习的深入,你将逐渐理解 Rust 的各种设计选择,包括这个问题。 + +## 不要强制自己使用其它编程语言的最佳实践来写Rust +大多数其它编程语言适用的最佳实践在Rust中也可以很好的使用,但是 Rust 并不是一门专门的面向对象或者函数式语言,因此在使用自己喜欢的编程风格时,也要考虑遵循 Rust 应有的实践。 + +例如纯面向对象或纯函数式编程,在 Rust 中就并不是一个很好的选择。如果你有过Go语言的编程经验,相信能更加理解我这里想表达的含义。 + +不过大家也不用担心,在书中我们以专题的形式专门讲解 Rust 的最佳实践,看完后自然就明白了。 + + + +## 总结 +对于新手而言,最应该避免的就是从**链表开始练手**,最应该做的就是认真仔细地学习一本优秀的书。 + +总之,认真学 Rust,既然选择了,就相信自己,你的前方会是星辰大海! \ No newline at end of file diff --git a/book/contents/test/intergration.md b/book/contents/test/intergration.md index ec7352e7..f8c693dc 100644 --- a/book/contents/test/intergration.md +++ b/book/contents/test/intergration.md @@ -1 +1,3 @@ # 集成测试 + +https://www.reddit.com/r/rust/comments/s9zs5c/how_do_you_debug_a_rust_library_after_compilation/ \ No newline at end of file diff --git a/book/contents/async/tokio/basic.md b/book/contents/tokio/basic.md similarity index 100% rename from book/contents/async/tokio/basic.md rename to book/contents/tokio/basic.md diff --git a/book/contents/tokio/intro.md b/book/contents/tokio/intro.md new file mode 100644 index 00000000..f2e3444a --- /dev/null +++ b/book/contents/tokio/intro.md @@ -0,0 +1 @@ +# tokio使用指南 diff --git a/book/contents/async/tokio/stream.md b/book/contents/tokio/stream.md similarity index 100% rename from book/contents/async/tokio/stream.md rename to book/contents/tokio/stream.md diff --git a/book/writing-material/posts/wasm.md b/book/writing-material/posts/wasm.md index e69de29b..8001670c 100644 --- a/book/writing-material/posts/wasm.md +++ b/book/writing-material/posts/wasm.md @@ -0,0 +1 @@ +https://www.reddit.com/r/rust/comments/s9yugv/compile_rust_to_wasm_and_import_as_typescript/ \ No newline at end of file From 359bf71dc8a4878a60b98b4c683a9c713de7686e Mon Sep 17 00:00:00 2001 From: liuyanjie Date: Sun, 23 Jan 2022 14:18:38 +0800 Subject: [PATCH 2/4] Update struct.md --- book/contents/basic/compound-type/struct.md | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/book/contents/basic/compound-type/struct.md b/book/contents/basic/compound-type/struct.md index 2fff626e..ad3d5dad 100644 --- a/book/contents/basic/compound-type/struct.md +++ b/book/contents/basic/compound-type/struct.md @@ -27,16 +27,17 @@ struct User { #### 创建结构体实例 为了使用上述结构体,我们需要创建`User`结构体的**实例**: ```rust - let user1 = User { + let user1 = User { email: String::from("someone@example.com"), username: String::from("someusername123"), active: true, sign_in_count: 1, -}; + }; ``` + 有几点值得注意: -1. 初始化实例时,需要为**每个字段**都进行初始化 -2. 初始化时的字段顺序无需按照定义的顺序来 +1. 初始化实例时,**每个字段**都需要进行初始化 +2. 初始化时的字段顺序不需要和结构体定义时的顺序一致 #### 访问结构体字段 通过`.`操作符即可访问结构体实例内部的字段值,也可以修改它们: @@ -50,7 +51,7 @@ struct User { user1.email = String::from("anotheremail@example.com"); ``` -需要注意的是,必须要将整个结构体都声明为可变的,才能修改其中的字段,Rust不允许单独将某个字段标记为可变: `let mut user1 = User {...}`. +需要注意的是,必须要将结构体实例声明为可变的,才能修改其中的字段,Rust不支持将某个结构体某个字段标记为可变. #### 简化结构体创建 下面的函数类似一个构建函数,返回了`User`结构体的实例: From 299db21cd8b3d56403bed175702d95dfc749a22e Mon Sep 17 00:00:00 2001 From: sunface Date: Sun, 23 Jan 2022 16:47:54 +0800 Subject: [PATCH 3/4] =?UTF-8?q?add=20tokio=E7=AE=80=E4=BB=8B?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- book/contents/SUMMARY.md | 11 ++-- book/contents/img/tokio-01.png | Bin 0 -> 54185 bytes book/contents/tokio/intro.md | 7 ++- book/contents/tokio/overview.md | 75 +++++++++++++++++++++++++++ book/writing-material/posts/tokio.md | 3 ++ 5 files changed, 90 insertions(+), 6 deletions(-) create mode 100644 book/contents/img/tokio-01.png create mode 100644 book/contents/tokio/overview.md create mode 100644 book/writing-material/posts/tokio.md diff --git a/book/contents/SUMMARY.md b/book/contents/SUMMARY.md index b9f21b68..2df43393 100644 --- a/book/contents/SUMMARY.md +++ b/book/contents/SUMMARY.md @@ -93,18 +93,19 @@ - [高阶特征约束(HRTB) todo](advance/hrtb.md) ## 专题内容,每个专题都配套一个小型项目进行实践 -- [async/await异步编程 doing](async/intro.md) +- [async/await异步编程](async/intro.md) - [async编程入门](async/getting-started.md) - [底层探秘: Future执行与任务调度](async/future-excuting.md) - [定海神针Pin和Unpin](async/pin-unpin.md) - - [async、await和Stream流处理](async/async-await.md) + - [async/await和Stream流处理](async/async-await.md) - [同时运行多个Future](async/multi-futures-simultaneous.md) - [一些疑难问题的解决办法](async/pain-points-and-workarounds.md) - [实践应用:Async Web服务器](async/web-server.md) -- [tokio使用指南](tokio/intro.md) - - [基本用法](tokio/basic.md) - - [异步消息流](tokio/stream.md)) +- 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zXqE)WnnTQaV2kAy_jHcTd;_6UJ0^z{$`HY{gdi`(Hp_ZJN=v!ysB5*WyLEgE2~Q&tPuUkacc!UW z123j1QjI;QPJ49q6E!!(^Q+tomSI9CH0k0UG~$3`PHW44gqB4Yf1+w!%?+gMBZwiz zRaTo(h*Vpsu1f-Ys9=3JB6I%BmNE6)h7e;CX}N+3%*LQh=5=%06!Jmsou;c52nYFF z(`UyT7)&P{5BTyzMI=#$I{f1+rDEjjh3SKwo}yoz{-2xf%HmUky|m<;ZRBpq%bsxa zMM2)Z!}{@^qI2&EgW@qjnetIL5B_vDVd9Rck?H}dXULlj?+9?C)C~Tl zfd(KG$x`0cj_fdaJ7NMO(;+3vQmA;64S(~iw98KQ+l~(Y9{djfdG{XBYp3Vf GMgI%nvtQZ( literal 0 HcmV?d00001 diff --git a/book/contents/tokio/intro.md b/book/contents/tokio/intro.md index f2e3444a..06f1508e 100644 --- a/book/contents/tokio/intro.md +++ b/book/contents/tokio/intro.md @@ -1 +1,6 @@ -# tokio使用指南 +# Tokio使用指南 +在上一个章节中,我们提到了 Rust 异步编程的限制,其中之一就是你必须引入社区提供的异步运行时,其中最有名的就是 `tokio`。 + +在本章中,我们一起来看看 `tokio` 到底有什么优势,以及该如何使用它。 + +> 本章在内容上大量借鉴和翻译了tokio官方文档[Tokio Tutorial](https://tokio.rs/tokio/tutorial), 但是重新组织了内容形式并融入了很多自己的见解和感悟,给大家提供更好的可读性和知识扩展性 \ No newline at end of file diff --git a/book/contents/tokio/overview.md b/book/contents/tokio/overview.md new file mode 100644 index 00000000..af0a587a --- /dev/null +++ b/book/contents/tokio/overview.md @@ -0,0 +1,75 @@ +# tokio简介 +对于 Async Rust,最最重要的莫过于底层的异步运行时,它提供了执行器、任务调度、异步API等核心服务。简单来说,使用 Rust 提供的 `async/.await` 特性编写的异步代码要运行起来,就必须依赖于异步运行时,否则这些代码将毫无用处。 + +## 异步运行时 +Rust 语言本身只提供了异步编程所需的基本特性,例如 `async/.await` 关键字,标准库中的 `Future` 特征,官方提供的 `futures` 实用库,这些特性单独使用没有任何用处,因此我们需要一个运行时来将这些特性实现的代码运行起来。 + +异步运行时是由 Rust 社区提供的,它们的核心是一个 `reactor` 和一个或多个 `executor`(执行器): + +- `reactor` 用于提供外部事件的订阅机制,例如 `I/O` 、进程间通信、定时器等 +- `executor` 在上一章我们有过深入介绍,它用于调度和执行相应的任务( `Future` ) + +目前最受欢迎的几个运行时有: + +- [`tokio`](https://github.com/tokio-rs/tokio),目前最受欢迎的异步运行时,功能强大,还提供了异步所需的各种工具(例如 tracing )、网络协议框架(例如 HTTP,gRPC )等等 +- [`async-std`](https://github.com/async-rs/async-std),最大的优点就是跟标准库兼容性较强 +- [`smol`](https://github.com/smol-rs/smol), 一个小巧的异步运行时 + +但是,大浪淘沙,留下的才是金子,随着时间的流逝,`tokio`越来越亮眼,无论是性能、功能还是社区、文档,它在各个方面都异常优秀,时至今日,可以说已成为事实上的标准。 + +#### 异步运行时的兼容性 +为何选择异步运行时这么重要?不仅仅是它们在功能、性能上存在区别,更重要的是当你选择了一个,往往就无法切换到另外一个,除非异步代码很少。 + +使用异步运行时,往往伴随着对它相关的生态系统的深入使用,因此耦合性会越来越强,直至最后你很难切换到另一个运行时,例如 `tokio` 和 `async-std` ,就存在这种问题。 + +如果你实在有这种需求,可以考虑使用 [`async-compat`](https://github.com/smol-rs/async-compat),该包提供了一个中间层,用于兼容 `tokio` 和其它运行时。 + +#### 结论 +相信大家看到现在,心中应该有一个结论了。首先,运行时之间的不兼容性,让我们必须提前选择一个运行时,并且在未来坚持用下去,那这个运行时就应该是最优秀、最成熟的那个,`tokio` 几乎成了不二选择,当然 `tokio` 也有自己的问题:更难上手和运行时之间的兼容性。 + +如果你只用 `tokio` ,那兼容性自然不是问题,至于难以上手,Rust 这么难,我们都学到现在了,何况区区一个异步运行时,在本书的帮忙下,这些都不再是个问题:) + +## tokio简介 +Tokio是一个纸醉金迷之地,只要有钱就可以为所欲为,哦,抱歉,走错片场了。`Tokio` 是 Rust 最优秀的异步运行时框架,它提供了写异步网络服务所需的几乎所有功能,不仅仅适用于大型服务器,还适用于小型嵌入式设备,它主要由以下组件构成: + +- 多线程版本的异步运行时,可以运行使用 `async/.await` 编写的代码 +- 标准库中阻塞API的异步版本,例如`thread::sleep`会阻塞当前线程,`tokio`中就提供了相应的异步实现版本 +- 构建异步编程所需的生态,甚至还提供了 [`tracing`](https://github.com/tokio-rs/tracing) 用于日志和分布式追踪, 提供 [`console`](https://github.com/tokio-rs/console) 用于 Debug 异步编程 + +### 优势 +下面一起来看看使用 `tokio` 能给你提供哪些优势。 + +**高性能** + +因为快所以快,前者是 Rust 快,后者是 `tokio` 快。 `tokio` 在编写时充分利用了 Rust 提供的各种零抽象和高性能特性,而且贯彻了 Rust 的牛逼思想:如果你选择手写代码,那么最好的结果就是跟 `tokio` 一样快! + +以下是一张官方提供的性能参考图,大致能体现出 `tokio` 的性能之恐怖: +tokio performance + +**高可靠** + +Rust 语言的安全可靠性顺理成章的影响了 `tokio` 的可靠性,曾经有一个调查给出了令人乍舌的[结论](https://www.zdnet.com/article/microsoft-70-percent-of-all-security-bugs-are-memory-safety-issues/):软件系统70%的高危漏洞都是由内存不安全性导致的。 + +在 Rust 提供的安全性之外,`tokio` 还致力于提供一致性的行为表现:无论你何时运行系统,它的预期表现和性能都是一致的,例如不会出现莫名其妙的请求延迟或响应时间大幅增加。 + +**简单易用** + +通过 Rust 提供的 `async/await` 特性,编写异步程序的复杂性相比当初已经大幅降低,同时 `tokio` 还为我们提供了丰富的生态,进一步大幅降低了其复杂性。 + +同时 `tokio` 遵循了标准库的命名规则,让熟悉标准库的用户可以很快习惯于 `tokio` 的语法,再借助于 Rust 强大的类型系统,用户可以轻松地编写和交付正确的代码。 + +**使用灵活性** +`tokio` 支持你灵活的定制自己想要的运行时,例如你可以选择多线程 + 任务盗取模式的复杂运行时,也可以选择单线程的轻量级运行时。总之,几乎你的每一种需求在 `tokio` 中都能寻找到支持(画外音:强大的灵活性需要一定的复杂性来换取,并不是免费的午餐)。 + +### 劣势 +虽然 `tokio` 对于大多数需要并发的项目都是非常适合的,但是确实有一些场景它并不适合使用: + +- 并行运行CPU密集型的任务,`tokio` 非常适合于IO密集型任务,这些IO任务的绝大多数时间都用于阻塞等待IO的结果,而不是刷刷刷的单烤CPU。如果你的应用是CPU密集型(例如并行计算),建议使用 [`rayon`](https://github.com/rayon-rs/rayon),当然,对于其中的IO任务部分,你依然可以混用 `tokio` +- 读取大量的文件, 读取文件的瓶颈主要在于操作系统,因为OS没有提供异步文件读取接口,大量的并发并不会提升文件读取的并行性能,反而可能会造成不可忽视的性能损耗,因此建议使用线程(或线程池)的方式 +- 发送HTTP请求,`tokio` 的优势是给予你并发处理大量任务的能力,对于这种轻量级 HTTP 请求场景,`tokio` 除了增加你的代码复杂性,并无法带来什么额外的优势。因此,对于这种场景,你可以使用 [`reqwest`](https://github.com/seanmonstar/reqwest) 库,它会更加简单易用。 + + +## 总结 +离开三方开源社区提供的异步运行时, `async/await` 什么都不是,甚至还不如一堆破铜烂铁,除非你选择根据自己的需求手撸一个。 + +而 `tokio` 就是那颗皇冠上的夜明珠,也是值得我们投入时间去深入学习的开源库,它的设计原理和代码实现都异常优秀,在之后的章节中,我们将对其进行深入学习和剖析,敬请期待。 \ No newline at end of file diff --git a/book/writing-material/posts/tokio.md b/book/writing-material/posts/tokio.md new file mode 100644 index 00000000..daaf35b7 --- /dev/null +++ b/book/writing-material/posts/tokio.md @@ -0,0 +1,3 @@ +## 性能 + +https://www.reddit.com/r/rust/comments/lg0a7b/benchmarking_tokio_tasks_and_goroutines/ \ No newline at end of file From 1f071a089a47abcca61780b15507966aaff3135e Mon Sep 17 00:00:00 2001 From: sunface Date: Sun, 23 Jan 2022 16:49:11 +0800 Subject: [PATCH 4/4] update readme --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index ea367c7a..c23dacd3 100644 --- a/README.md +++ b/README.md @@ -8,7 +8,7 @@ - 知乎: [支持章节内目录跳转,很好用!](https://www.zhihu.com/column/c_1452781034895446017) -- 最近修订: 新增章节 [为async疑难杂症把把脉](https://zhuanlan.zhihu.com/p/460749920) +- 最近修订: 新增章节 [Tokio使用指南 - 总览](https://zhuanlan.zhihu.com/p/460984955) - Rust 版本: Rust edition 2021 - QQ 交流群:1009730433