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rust match如何處理異步編程

小樊
81
2024-11-20 12:00:36
欄目: 編程語言

在Rust中,處理異步編程通常使用async/await語法和異步運(yùn)行時(如Tokio或async-std)。雖然match語句本身不能直接處理異步編程,但你可以結(jié)合async/awaitmatch來處理異步任務(wù)的結(jié)果。

以下是一個使用Tokio運(yùn)行時的示例,展示了如何在Rust中使用async/awaitmatch處理異步編程:

use tokio::net::TcpStream;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut stream = TcpStream::connect("127.0.0.1:8080").await?;
    let request = b"GET / HTTP/1.1\r\nHost: 127.0.0.1:8080\r\n\r\n";

    stream.write_all(request).await?;

    let mut buffer = [0; 1024];
    let n = stream.read(&mut buffer).await?;

    let response = String::from_utf8_lossy(&buffer[..n]);
    let mut lines = response.lines();

    while let Some(line) = lines.next() {
        let response_line = match line {
            Ok(line) => line,
            Err(e) => {
                eprintln!("Error reading line: {}", e);
                continue;
            }
        };

        if response_line.starts_with("HTTP") {
            let mut parts = response_line.split_whitespace();
            let status_code = parts.next().ok_or("Error splitting HTTP line")?;
            let status_message = parts.next().ok_or("Error splitting HTTP line")?;

            let mut parts = status_code.split('/');
            let http_version = parts.next().ok_or("Error splitting HTTP version")?;
            let status = parts.next().ok_or("Error splitting HTTP status")?;

            println!("HTTP Version: {}", http_version);
            println!("Status Code: {}", status);
            println!("Status Message: {}", status_message);
        } else {
            println!("{}", response_line);
        }
    }

    Ok(())
}

在這個示例中,我們使用async/await語法連接到TCP服務(wù)器,發(fā)送HTTP請求,并讀取響應(yīng)。然后,我們使用match語句處理響應(yīng)的每一行,根據(jù)HTTP版本、狀態(tài)碼和狀態(tài)消息進(jìn)行分類。

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