我无法编译一个简单的应用程序来测试 tokio-codec。
tokio::net::tcp::stream::TcpStream 实现了 AsyncRead 和 -Write。
但是当我尝试编译下面的代码时,出现以下错误。
我还是 Rust 和 Tokio 的新手,所以毫无疑问我错过了一些明显的东西(我希望)......
主.rs:
use tokio::net::TcpListener;
use tokio::prelude::*;
use tokio_codec::{ Framed, LinesCodec };
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let mut listener = TcpListener::bind("127.0.0.1:12321").await?;
loop {
let (socket, _addr) = listener.accept().await?;
tokio::spawn(async move {
let (_sink, mut stream) = Framed::new(socket, LinesCodec::new()).split();
while let Some(Ok(line)) = stream.next().await {
println!("{:?}", line);
}
});
}
}
cargo .toml:
[dependencies]
tokio = { version = "0.2.6", features = ["full"] }
tokio-codec = "0.1.1"
输出:
error[E0277]: the trait bound `tokio::net::tcp::stream::TcpStream: tokio_io::async_read::AsyncRead` is not satisfied
--> src\main.rs:14:36
|
14 | let (mut sink, mut stream) = Framed::new(socket, LinesCodec::new()).split();
| ^^^^^^^^^^^ the trait `tokio_io::async_read::AsyncRead` is not implemented for `tokio::net::tcp::stream::TcpStream`
|
= note: required by `tokio_io::_tokio_codec::framed::Framed::<T, U>::new`
error[E0277]: the trait bound `tokio::net::tcp::stream::TcpStream: tokio_io::async_write::AsyncWrite` is not satisfied
--> src\main.rs:14:36
|
14 | let (mut sink, mut stream) = Framed::new(socket, LinesCodec::new()).split();
| ^^^^^^^^^^^ the trait `tokio_io::async_write::AsyncWrite` is not implemented for `tokio::net::tcp::stream::TcpStream`
|
= note: required by `tokio_io::_tokio_codec::framed::Framed::<T, U>::new`
error[E0599]: no method named `split` found for type `tokio_io::_tokio_codec::framed::Framed<tokio::net::tcp::stream::TcpStream, tokio_codec::lines_codec::LinesCodec>` in the current scope
--> src\main.rs:14:75
|
14 | let (mut sink, mut stream) = Framed::new(socket, LinesCodec::new()).split();
| ^^^^^ method not found in `tokio_io::_tokio_codec::framed::Framed<tokio::net::tcp::stream::TcpStream, tokio_codec::lines_codec::LinesCodec>`
|
= note: the method `split` exists but the following trait bounds were not satisfied:
`&mut tokio_io::_tokio_codec::framed::Framed<tokio::net::tcp::stream::TcpStream, tokio_codec::lines_codec::LinesCodec> : tokio::io::util::async_buf_read_ext::AsyncBufReadExt`
`&tokio_io::_tokio_codec::framed::Framed<tokio::net::tcp::stream::TcpStream, tokio_codec::lines_codec::LinesCodec> : tokio::io::util::async_buf_read_ext::AsyncBufReadExt`
`tokio_io::_tokio_codec::framed::Framed<tokio::net::tcp::stream::TcpStream, tokio_codec::lines_codec::LinesCodec> : tokio::io::util::async_buf_read_ext::AsyncBufReadExt`
我该如何解决这个问题?
最佳答案
tokio-codec
是一个过时的 crate,它依赖于 Tokio (0.1.7) 的 pre-async/await 版本
seem to have been moved 到 tokio-util 的编解码器取决于 Tokio 0.2,所以你应该有更多的运气。
一般来说,当编译器告诉你一个类型没有实现一个 trait,但在你看到的文档中它实现了,这意味着你有两个不同版本的 crate 来定义你的项目中的 trait(在这种情况下是 Tokio 0.1 和 0.2) .
关于asynchronous - 特征绑定(bind) `tokio::net::tcp::stream::TcpStream: tokio_io::async_read::AsyncRead` 不满足,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/59532617/