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ak1ra's Lab

@ak1ra_lab
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ak1ra's Lab

23 Sep 2022, 14:51

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Nginx 的 sub_filter 模块只能做简单的字符串替换, 倒是有个第三方的叫 subs_filter 的模块可以做正则匹配替换, 不过代码差不多 10 年没动过了, 如果是调用 PCRE 库的话, 这个模块本身确实不需要怎么更新 (不过涉及到正则表达式, 我估计这个模块大概率会大大拉慢 Nginx 速度...

* sub_filter: https://nginx.org/en/docs/http/ngx_http_sub_module.html
* subs_filter: https://github.com/yaoweibin/ngx_http_substitutions_filter_module
GitHub - yaoweibin/ngx_http_substitutions_filter_module: a filter module which can do both regular expression and fixed string substitutions for nginx
a filter module which can do both regular expression and fixed string substitutions for nginx - GitHub - yaoweibin/ngx_http_substitutions_filter_module: a filter module which can do both regular ex...
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ak1ra's Lab

23 Sep 2022, 13:32

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集中请求了一会 /en/wiki/Special:Random, CPU Time 直接 >30ms 了, 话说 Workers 对于 Free Plan 的这些性能超限的请求会直接截断还是怎样?
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ak1ra's Lab

23 Sep 2022, 13:19

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只要用到正则, 整页 html 文档用正则表达式来匹配 URL 效率还是很低, 而且还不如 HTMLRewriter 好用.

之前以为是 HTMLRewriter 针对每个 element 都去调用一遍 .element() method 去匹配和转换是性能瓶颈的原因, 这里发现对整页文档去 .replace() 好像并没有提升什么效率, 每页上百个链接, 每个链接都使用好几次正则, 难怪性能那么差 (
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ak1ra's Lab

23 Sep 2022, 03:44

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Kubernetes – Production-Grade Container Orchestration
Blog: Kubernetes 1.25: CustomResourceDefinition Validation Rules Graduate to Beta
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ak1ra's Lab

22 Sep 2022, 22:21

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现学了两天 TypeScript, 写了个 Wikipedia 代理.
https://github.com/ak1ra-lab/wikipedia-proxy

现在基本可用了, 大量使用正则表达式, 性能堪忧(CPU Time ~5.9 ms/request), 可能有很大优化空间. 除此之外还有点别的小问题, 部分图片资源报 403 错误, 貌似与 Permissions-Policy HTTP Header 有关, 还没研究明白...

#cloudflare #workers #wikipedia
GitHub - ak1ra-lab/wikipedia-proxy: Yet another Wikipedia Proxy running on Cloudflare Workers.
Yet another Wikipedia Proxy running on Cloudflare Workers. - GitHub - ak1ra-lab/wikipedia-proxy: Yet another Wikipedia Proxy running on Cloudflare Workers.
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ak1ra's Lab

22 Sep 2022, 22:18

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现在基本可用了, 还有点小问题, 部分图片资源报 403 错误, 还是于前面所说的 Permissions-Policy 有关, 还没研究明白 (
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ak1ra's Lab

22 Sep 2022, 22:17

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搞定了!

不过这个 CPU Time 有点高啊, 性能堪忧... 虽然说 Cloudflare Workers 在 10ms 内都 ok (
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ak1ra's Lab

22 Sep 2022, 21:37

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我居然忘了 referer header!!!

页面内调用 /page/summary 接口, 请求肯定会带上正确的 referer header 的 (
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ak1ra's Lab

22 Sep 2022, 21:12

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现在的问题是要找到 Wikipedia 实现 page summary, 即在调用 /page/summary 接口时, 使用 .hover() 的那段代码? 然后想办法在返回这段脚本时替换里面的接口地址, 为 pathname 加个 region 前缀.

* https://en.wikipedia.org/api/rest_v1/#/Page%20content/get_page_summary__title_
* https://api.jquery.com/hover/

Wikipedia 好像大量用了 jQuery (
.hover() | jQuery API Documentation
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ak1ra's Lab

22 Sep 2022, 19:10

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看了这个, 好像懂了, 但没找到问题原因 (
https://developer.chrome.com/en/docs/privacy-sandbox/permissions-policy/

---
让我复述一遍,

permissions-policy 这个 Header 是用于控制在页面内嵌入(iframe)其它页面时, 是否允许浏览器开启某些功能, 比如当服务器返回:

Permissions-Policy: geolocation=(self "https://trusted-site.example")

时, 且 iframe 中加入了 allow="geolocation" 属性时, 嵌入的 同源(self) 和 https://trusted-site.example 的 ifame 被允许使用 geolocation 功能.
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ak1ra's Lab

22 Sep 2022, 14:22

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还剩一些 HTTP Headers 的问题, 图片资源加载时被 403 了 (

permissions-policy:
interest-cohort=(),
ch-ua-arch=(self "intake-analytics.wikimedia.org"),
ch-ua-bitness=(self "intake-analytics.wikimedia.org"),
ch-ua-full-version-list=(self "intake-analytics.wikimedia.org"),
ch-ua-model=(self "intake-analytics.wikimedia.org"),
ch-ua-platform-version=(self "intake-analytics.wikimedia.org")

待我研究下这些字段是什么含义吧 (
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ak1ra's Lab

22 Sep 2022, 14:19

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结果是引入的 lodash 这个库的问题 (
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ak1ra's Lab

22 Sep 2022, 13:15

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ak1ra's Lab

22 Sep 2022, 13:09

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怎么用 TypeScript 写的代码编译器都通过了运行时还能报 TypeError (?

Illegal invocation 是什么情况?
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ak1ra's Lab

21 Sep 2022, 03:37

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Kubernetes – Production-Grade Container Orchestration
Blog: Kubernetes 1.25: Use Secrets for Node-Driven Expansion of CSI Volumes
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ak1ra's Lab

20 Sep 2022, 12:24

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ak1ra's Lab

19 Sep 2022, 23:51

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Kubernetes – Production-Grade Container Orchestration
Blog: Kubernetes 1.25: Local Storage Capacity Isolation Reaches GA
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ak1ra's Lab

19 Sep 2022, 21:25

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翻译成 JavaScript 是真的把 Type annotation/alias/interface 之类的定义都扔了, 而且像 type, interface 这些关键字在 JavaScript 中不存在, 另外, TypeScript 中用 const/var/let 定义的值翻译过来通通变成了 var (
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ak1ra's Lab

19 Sep 2022, 19:55

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原来我不小心跳过了 TypeScript Tooling in 5 minutes 这一节内容, 我说怎么一开始我不知道怎么运行 TypeScript 代码 (
Documentation - TypeScript Tooling in 5 minutes
A tutorial to understand how to create a small website with TypeScript
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ak1ra's Lab

19 Sep 2022, 19:54

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