50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
#![deny(warnings)]
|
|
extern crate hyper;
|
|
#[macro_use]
|
|
extern crate serde_derive;
|
|
extern crate serde;
|
|
extern crate serde_json;
|
|
|
|
use hyper::Client;
|
|
use hyper::rt::{self, Future, Stream};
|
|
|
|
fn main() {
|
|
let url = "http://jsonplaceholder.typicode.com/users".parse().unwrap();
|
|
|
|
// Run the runtime with the future trying to fetch, parse and print json.
|
|
//
|
|
// Note that in more complicated use cases, the runtime should probably
|
|
// run on its own, and futures should just be spawned into it.
|
|
rt::run(fetch_json(url));
|
|
}
|
|
|
|
fn fetch_json(url: hyper::Uri) -> impl Future<Item=(), Error=()> {
|
|
let client = Client::new();
|
|
|
|
client
|
|
// Fetch the url...
|
|
.get(url)
|
|
// And then, if we get a response back...
|
|
.and_then(|res| {
|
|
// asynchronously concatenate chunks of the body
|
|
res.into_body().concat2()
|
|
})
|
|
// use the body after concatenation
|
|
.map(|body| {
|
|
// try to parse as json with serde_json
|
|
let users: Vec<User> = serde_json::from_slice(&body).expect("parse json");
|
|
|
|
// pretty print result
|
|
println!("{:#?}", users);
|
|
})
|
|
// If there was an error, let the user know...
|
|
.map_err(|err| {
|
|
eprintln!("Error {}", err);
|
|
})
|
|
}
|
|
|
|
#[derive(Deserialize, Debug)]
|
|
struct User {
|
|
id: i32,
|
|
name: String,
|
|
} |