req_ 0.1.6

req_
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# req_

```rust
use std::{any::TypeId, future::Future};

use aok::Result;
use dashmap::DashMap;
use http::header::HeaderMap;
use tokio::sync::OnceCell;

pub trait Extract {
  fn id(headers: &HeaderMap) -> impl Future<Output = Result<u64>> + Send;
  fn new(id: u64) -> Self;
}

pub struct Req {
  pub headers: HeaderMap,
  pub cache: DashMap<TypeId, OnceCell<u64>>,
}

impl Req {
  pub fn new(headers: HeaderMap) -> Self {
    Self {
      headers,
      cache: DashMap::new(),
    }
  }

  pub async fn get<T: Extract + 'static>(&self) -> Result<T> {
    let type_id = TypeId::of::<T>();
    let cell = self.cache.entry(type_id).or_default();
    Ok(T::new(
      *cell.get_or_try_init(|| T::id(&self.headers)).await?,
    ))
  }
}
```

## About

This project is an open-source component of [i18n.site ⋅ Internationalization Solution](https://i18n.site).

* [i18 : MarkDown Command Line Translation Tool](https://i18n.site/i18)

  The translation perfectly maintains the Markdown format.

  It recognizes file changes and only translates the modified files.

  The translated Markdown content is editable; if you modify the original text and translate it again, manually edited translations will not be overwritten (as long as the original text has not been changed).

* [i18n.site : MarkDown Multi-language Static Site Generator](https://i18n.site/i18n.site)

  Optimized for a better reading experience

## 关于

本项目为 [i18n.site ⋅ 国际化解决方案](https://i18n.site) 的开源组件。

* [i18 :  MarkDown命令行翻译工具](https://i18n.site/i18)

  翻译能够完美保持 Markdown 的格式。能识别文件的修改，仅翻译有变动的文件。

  Markdown 翻译内容可编辑；如果你修改原文并再次机器翻译，手动修改过的翻译不会被覆盖（如果这段原文没有被修改）。

* [i18n.site : MarkDown多语言静态站点生成器](https://i18n.site/i18n.site) 为阅读体验而优化。