You might be familiar with OAuth scopes from for example the Github dialog for creating a new access token. You get to choose what the token is authorized to do: can the user manage repos? Leave reviews? Push commits? There are a ton of options. Similarly Mastodon has scopes such as “see favorites” or “post on your behalf.”
Server-side rendering a ClojureScript app with Deno
タイトルは英語のままなのは、日本語にしようとしても結局全部カタカナになるので放置。さてre-frameは俺的にClojureScriptでウェブのフロントエンド作るにあたって標準装備になっているが、ものによっては完全動的に生成されるReactのアプリよりも、検索エンジンなどでも絶対拾える静的HTMLを返した方がいいという場合もある。今回は流行り言葉をいっぱい使えるように、Denoを活かしてClojureScriptアプリのサーバーサイドレンダリングを実現しようと思います。動くコードはGithubにて。
Frontend/backend shared routing with reitit
Commonly frontend and backend are separate beasts. Backend written in Ruby using Rails for example, its routing written in its own DSL. Frontend written in TypeScript using Vue.js for example, its routing written in its own DSL. Of course the frontend will call some backend endpoints, so it should definitely know about those backend endpoints too, while there may be some frontend “paths” that don’t correspond to any single API endpoint, yet you might want to generate absolute URLs for those pages on the backend. This results in a nasty mess and duplication of routing and adjacent logic.
Dealing with circular dependencies in Clojure
While working on stuff (of course in Clojure), I kept running into problems with namespaces having circular dependencies. For example I’d have an app.router
namespace that defines the, uh, routes. I’d have an app.url
namespace that contains helper functions to generate absolute URLs based on route data (so it depends on app.router
). I’d have an app.views
namespace that uses those URL helpers (thus depending on app.url
), and these views would be referenced in the routes so app.router
would require app.views
.
This completes the dependency circle and is the beginning of my journey. There are a bunch of ways to deal with circular dependencies in Clojure, but I won’t go in-depth about all of them.
Clojure multimethods and derivation
I’ve known about Clojure multimethods of course, but I never really used them much. I didn’t really have data that I’d need polymorphism like multimethods to handle, and when I did need something like that I’d use protocols. However protocols dispatch based on class, so when I faced the problem of handling ActivityPub objects that are all maps, it was time for defmulti
to save the day.
Structured logging in Clojure
The first time I ran into “structured logging” was way, way back when I first started working on kitsune. Back then I went with the approach of using a Logback Formatter (the JacksonJsonFormatter) to log Clojure maps as JSON. This was nice because I didn’t have to do anything to “transform” the logs further, but had the quite significant downside that logs weren’t really human readable anymore. This plus that that log processors like Loki and CloudWatch can easily parse huge amounts of “traditional” text logs made me pretty much forget about structured logging until recently.
That is until in a thread on the clojurians slack about logging someone mentioned mulog, a structured logging library that caught my attention. I guess maybe from a traditional Clojure background it would’ve been natural to end up with taoensso/timbre at this point, but I never did that bit (though I do have it as an indirect dependency).
自分でアドカレを作ってみた
アドカレのブログでアドカレ作った話を書くのはさすがにちょっとメタすぎる気もするが、学ぶことは少なくなかったのでまとめる。思いの外スムーズにいったこともあって、小規模ながらもおもしろかった。
Hot reloading and reitit in the frontend
Ever since I first ran into the Metosin libraries, I’ve been using many of them. One of the most known and used of those is probably reitit, a routing library that can be used both on the server and in the browser. Recently I’ve had more opportunities using ClojureScript in the browser, and I noticed something that was confusing for a few moments.
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Recent Posts
Tags
ale anime art beer blog clojure code coffee deutsch emo english fansub fest filozófia food gaming gastrovale geek hegymász jlc kaja kultúra language literature live magyar movie másnap politika rant sport suli szolgálati közlemény travel társadalom ubuntu university weather work zene 日本 日本語 百名山 艦これ 軽音七大陸最高峰チャレンジ