【Rust日报】 2020-1-16 用 Rust 来诠释 Epoll, Kqueue 和 IOCP

用 Rust 来诠释 Epoll, Kqueue 和 IOCP

这其实是一本书，旨在说明 Epoll，Kqueue 和 IOCP 的工作原理，我们可以将其用于高效率、高性能的 I/O。其中一些实现将会使用 rust，原文地址：​​https://cfsamsonbooks.gitbook.io/epoll-kqueue-iocp-explained/​​

扩展阅读：Green Threads Explained in 200 Lines of Rust

reddit 上参与讨论：​​https://www.reddit.com/r/rust/comments/ephm4t/epoll_kqueue_and_iocp_explained_with_rust/​​

Deadpool

​​Deadpool​​ 是一个死的简单异步池，用于任何类型的连接和对象。

Example

use async_trait::async_trait;

#[derive(Debug)]
enum Error { Fail }

struct Computer {}
struct Manager {}
type Pool = deadpool::managed::Pool<Computer, Error>;

impl Computer {
    async fn get_answer(&self) -> i32 {
42
    }
}

#[async_trait]
impl deadpool::managed::Manager<Computer, Error> for Manager {
    async fn create(&self) -> Result<Computer, Error> {
Ok(Computer {})
    }
    async fn recycle(&self, conn: &mut Computer) -> deadpool::managed::RecycleResult<Error> {
Ok(())
    }
}

#[tokio::main]
async fn main() {
let mgr = Manager {};
let pool = Pool::new(mgr, 16);
let mut conn = pool.get().await.unwrap();
let answer = conn.get_answer().await;
assert_eq!(answer, 42);
}

这个库还提供：Database connection pools，GitHub 地址：​​https://github.com/bikeshedder/deadpool​​

factori

​​Factori​​ is a testing factory library inspired by Ruby's FactoryBot.

Example

​​Factori​​ provides two macros: factori!, which defines a factory for a type, and ​​create!​​ which instantiates it:

#[macro_use]
extern crate factori;

pub struct Vehicle {
    number_wheels: u8,
    electric: bool,
}

factori!(Vehicle, {
default {
        number_wheels = 4,
        electric = false,
    }

    mixin bike {
        number_wheels = 2,
    }
});

fn main() {
let default = create!(Vehicle);
assert_eq!(default.number_wheels, 4);
assert_eq!(default.electric, false);

// Its type is Vehicle, nothing fancy:
let vehicle: Vehicle = default;

let three_wheels = create!(Vehicle, number_wheels: 3);
assert_eq!(three_wheels.number_wheels, 3);

let electric_bike = create!(Vehicle, :bike, electric: true);
assert_eq!(electric_bike.number_wheels, 2);
assert_eq!(electric_bike.electric, true);
}

​