在Rust中,處理異步編程通常使用async
/await
語法和異步運行時(如Tokio或async-std)。雖然match
語句本身不能直接處理異步編程,但你可以結合async
/await
和match
來處理異步任務的結果。
以下是一個使用Tokio運行時的示例,展示了如何在Rust中使用async
/await
和match
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服務器,發送HTTP請求,并讀取響應。然后,我們使用match
語句處理響應的每一行,根據HTTP版本、狀態碼和狀態消息進行分類。