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f9f65b7aa6
This replaces the usage of `tokio::io::{AsyncRead, AsyncWrite}` in hyper's public API with new traits in the `hyper::rt` module.
Closes #3110
BREAKING CHANGE: Any IO transport type provided must not implement `hyper::rt::{Read, Write}` instead of
`tokio::io` traits. You can grab a helper type from `hyper-util` to wrap Tokio types, or implement the traits yourself,
if it's a custom type.
70 lines
1.8 KiB
Rust
70 lines
1.8 KiB
Rust
#![deny(warnings)]
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#![warn(rust_2018_idioms)]
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use bytes::Bytes;
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use http_body_util::{BodyExt, Empty};
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use hyper::{body::Buf, Request};
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use serde::Deserialize;
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use tokio::net::TcpStream;
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#[path = "../benches/support/mod.rs"]
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mod support;
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use support::TokioIo;
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// A simple type alias so as to DRY.
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type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
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#[tokio::main]
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async fn main() -> Result<()> {
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let url = "http://jsonplaceholder.typicode.com/users".parse().unwrap();
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let users = fetch_json(url).await?;
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// print users
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println!("users: {:#?}", users);
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// print the sum of ids
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let sum = users.iter().fold(0, |acc, user| acc + user.id);
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println!("sum of ids: {}", sum);
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Ok(())
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}
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async fn fetch_json(url: hyper::Uri) -> Result<Vec<User>> {
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let host = url.host().expect("uri has no host");
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let port = url.port_u16().unwrap_or(80);
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let addr = format!("{}:{}", host, port);
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let stream = TcpStream::connect(addr).await?;
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let io = TokioIo::new(stream);
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let (mut sender, conn) = hyper::client::conn::http1::handshake(io).await?;
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tokio::task::spawn(async move {
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if let Err(err) = conn.await {
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println!("Connection failed: {:?}", err);
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}
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});
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let authority = url.authority().unwrap().clone();
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// Fetch the url...
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let req = Request::builder()
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.uri(url)
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.header(hyper::header::HOST, authority.as_str())
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.body(Empty::<Bytes>::new())?;
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let res = sender.send_request(req).await?;
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// asynchronously aggregate the chunks of the body
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let body = res.collect().await?.aggregate();
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// try to parse as json with serde_json
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let users = serde_json::from_reader(body.reader())?;
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Ok(users)
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}
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#[derive(Deserialize, Debug)]
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struct User {
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id: i32,
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#[allow(unused)]
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name: String,
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}
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