如何解决Tokio和Serde:反序列化JSON
当尝试从tokio Value
反序列化为JSON TcpStream
时,我正在尝试使用以下功能:
use futures::prelude::*;
use serde_json::Value;
use tokio::io::{AsyncReadExt,AsyncWriteExt};
use tokio::net::{TcpListener,TcpStream};
use tokio::stream::StreamExt;
use tokio_serde_json::ReadJson;
use tokio_util::codec::{FramedRead,LengthDelimitedCodec};
pub async fn handle_stream(mut stream: TcpStream) {
let length_delimited = FramedRead::new(stream,LengthDelimitedCodec::new());
let mut deserialized = ReadJson::<_,Value>::new(length_delimited);
}
我的依赖版本为:
tokio = { version = "0.2.22",features=["full"] }
tokio-util = { version = "0.3.0",features=["full"] }
tokio-serde = "0.6"
serde = "1.0.92"
serde_derive = "1.0.92"
serde_json = "1.0.39"
futures-preview = "0.3.0-alpha"
我从examples from carllerche/tokio-serde-json
但是我遇到以下错误:
error[E0277]: the trait bound `tokio_util::codec::framed_read::FramedRead<tokio::net::tcp::stream::TcpStream,tokio_util::codec::length_delimited::LengthDelimitedCodec>: futures::stream::Stream` is not satisfied
--> src/kad2.rs:141:58
|
141 | let mut deserialized = ReadJson::<_,Value>::new(length_delimited);
| ^^^^^^^^^^^^^^^^ the trait `futures::stream::Stream` is not implemented for `tokio_util::codec::framed_read::FramedRead<tokio::net::tcp::stream::TcpStream,tokio_util::codec::length_delimited::LengthDelimitedCodec>`
|
= note: required by `tokio_serde_json::ReadJson::<T,U>::new`
这是API和推荐库的一种情况,它已经进化并转移到另一种做事方式了吗?
我现在如何使用Tokio将JSON反序列化为Value
?
解决方法
这个仓库似乎被另一个仓库抛弃了:
之前:tokio-serde-json
之后:tokio-serde
https://github.com/carllerche/tokio-serde/blob/master/examples/server.rs
我用过这个服务器代码:
use futures::prelude::*;
use serde_json::Value;
use tokio::net::TcpListener;
use tokio_serde::formats::*;
use tokio_util::codec::{FramedRead,LengthDelimitedCodec};
#[tokio::main]
pub async fn main() {
// Bind a server socket
let listener = TcpListener::bind("127.0.0.1:17653").await.unwrap();
println!("listening on {:?}",listener.local_addr());
loop {
let (socket,_) = listener.accept().await.unwrap();
// Delimit frames using a length header
let length_delimited = FramedRead::new(socket,LengthDelimitedCodec::new());
// Deserialize frames
let mut deserialized = tokio_serde::SymmetricallyFramed::new(
length_delimited,SymmetricalJson::<Value>::default(),);
// Spawn a task that prints all received messages to STDOUT
tokio::spawn(async move {
while let Some(msg) = deserialized.try_next().await.unwrap() {
println!("GOT: {:?}",msg);
}
});
}
}
具有以下依赖项:
[dependencies]
futures = "0.3"
impls = "1"
tokio = { version = "1.0",features = ["full"] }
tokio-util = { version = "0.6",features = ["codec"] }
static_assertions = "1.1.0"
serde_json = "1.0"
tokio-serde = { version = "0.8",features = ["json"] }
并且编译运行成功。
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