Bazel build Go

1 .Bazel build //:Go yuan@liulishuo.com 

2 .Help everyone become a global citizen! github/lingochamp 

3 .何源 yuan@liulishuo.com 2014 年年底加⼊入流利利说， ⽬目前主要负责 Platform Team 来流利利说之前在 ThePlant 杭州⼯工作 

4 .Agenda • Package Management • Code Management (Multi languages) • Bazel build //:Go • Demo •Q&A 

5 . Let's talk about Package Management 

6 .vendor 

7 .Go 1.5 vendor introduced experimental support for a " " directory, enabled by the GO15VENDOREXPERIMENT environment variable. Go 1.6 enabled this behavior by default , and in Go 1.7 , this switch has been removed and the "vendor" behavior is ALWAYS enabled. 

8 .vendor 很棒! 棒? @2015 - 2016? 

9 .$ cd $GOPATH/src/upspin.io && tree vendor/ 🤔 🤔 🤥 

10 .IT WORKS. 

11 .Russ Cox 有话要讲 

12 .A Proposal for Package Versioning in Go - Russ Cox 

13 .Russ Cox 说: • Rust 的 Cargo 做的不不错，于是我们做了了 Dep • ⼋八年年的 go install 和 go get ⾟辛苦⼤大家了了， go module 了了解⼀一下 • go module 会⼲干掉⼤大部分的 vendor ⽬目录 🤔 

14 .Russ Cox 说: "the new concept of a Go module, which is a collection of packages versioned as a unit; verifiable and verified builds; and version-awareness throughout the go command, enabling work outside $GOPATH and the elimination of (most) vendor directories. 

15 .vgo 

16 .

17 .1. Packages Versioned 2. Verifiable and verified builds 3. Work outside $GOPATH 

18 .

19 .Google 这么多年年怎么 build Go 的？ 

20 .Code Management :) 

21 .Why should I care? 

22 .is scaling up, fast 

23 .

24 .$ kubectl get pods --all-namespaces | awk '{print $2}' | awk -F '-' '{print $1"-"$2}' | uniq | wc -l 213* 

25 .Why should I care? • New product lines, features (D***n, Ba**ta, IELTS, etc.) • Increasingly sophisticated systems(E.g., adaptive learning system) • Ever tighter integration • Algorithm, backend, data, all part of one system • We are in the process of becoming a big data company • Data exchange between heterogeneous components • Multi languages, Go, C++, Python, Java • Evolving independently, at varied pace 

26 .At scale, managing code becomes highly non-trivial! 

27 .Code Management Challenges 

28 .How to propagate changes? 

29 .• Has the server / client got the new proto field? • Trivial if you just have one proto file • How about a.proto imports b.proto who imports c.proto? • How about a.proto imports b.proto and c.proto both of which import d.proto? • I have marked this field deprecated for a month, can I delete? Or someone is still using it… • Even worse, somebody might have re-purposed it...