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docs(examples): update send_file example to async/await

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This commit is contained in:
Weihang Lo
2019-07-16 06:26:15 +08:00
committed by Sean McArthur
parent 524a453b6f
commit e8c19fea4c
4 changed files with 83 additions and 80 deletions
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2
Cargo.toml
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@@ -53,7 +53,7 @@ num_cpus = "1.0"
pretty_env_logger = "0.3" pretty_env_logger = "0.3"
spmc = "0.2" spmc = "0.2"
url = "1.0" url = "1.0"
#tokio-fs = "0.1" tokio-fs = { git = "https://github.com/tokio-rs/tokio" }
#tokio-mockstream = "1.1.0" #tokio-mockstream = "1.1.0"
serde = "1.0" serde = "1.0"
serde_derive = "1.0" serde_derive = "1.0"

82
examples/send_file.rs Normal file
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@@ -0,0 +1,82 @@
#![feature(async_await)]
#![deny(warnings)]
use tokio::io::AsyncReadExt;
use tokio_fs::file::File;
use hyper::{Body, Method, Result, Request, Response, Server, StatusCode};
use hyper::service::{make_service_fn, service_fn};
static INDEX: &str = "examples/send_file_index.html";
static INTERNAL_SERVER_ERROR: &[u8] = b"Internal Server Error";
static NOTFOUND: &[u8] = b"Not Found";
#[hyper::rt::main]
async fn main() {
pretty_env_logger::init();
let addr = "127.0.0.1:1337".parse().unwrap();
let make_service = make_service_fn(|_| async {
Ok::<_, hyper::Error>(service_fn(response_examples))
});
let server = Server::bind(&addr)
.serve(make_service);
println!("Listening on http://{}", addr);
if let Err(e) = server.await {
eprintln!("server error: {}", e);
}
}
async fn response_examples(req: Request<Body>) -> Result<Response<Body>> {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") |
(&Method::GET, "/index.html") |
(&Method::GET, "/big_file.html") => {
simple_file_send(INDEX).await
}
(&Method::GET, "/no_file.html") => {
// Test what happens when file cannot be be found
simple_file_send("this_file_should_not_exist.html").await
}
_ => Ok(not_found())
}
}
/// HTTP status code 404
fn not_found() -> Response<Body> {
Response::builder()
.status(StatusCode::NOT_FOUND)
.body(NOTFOUND.into())
.unwrap()
}
/// HTTP status code 500
fn internal_server_error() -> Response<Body> {
Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(INTERNAL_SERVER_ERROR.into())
.unwrap()
}
async fn simple_file_send(f: &str) -> Result<Response<Body>> {
// Serve a file by asynchronously reading it entirely into memory.
// Uses tokio_fs to open file asynchronously, then tokio::io::AsyncReadExt
// to read into memory asynchronously.
let filename = f.to_string(); // we need to copy for lifetime issues
if let Ok(mut file) = File::open(filename).await {
let mut buf = Vec::new();
if let Ok(_) = file.read_to_end(&mut buf).await {
return Ok(Response::new(buf.into()));
}
return Ok(internal_server_error());
}
return Ok(not_found());
}

0
examples_disabled/send_file_index.html → examples/send_file_index.html
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79
examples_disabled/send_file.rs
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@@ -1,79 +0,0 @@
#![deny(warnings)]
extern crate futures;
extern crate hyper;
extern crate pretty_env_logger;
extern crate tokio_fs;
extern crate tokio_io;
use futures::{future, Future};
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use hyper::service::service_fn;
use std::io;
static NOTFOUND: &[u8] = b"Not Found";
static INDEX: &str = "examples/send_file_index.html";
fn main() {
pretty_env_logger::init();
let addr = "127.0.0.1:1337".parse().unwrap();
let server = Server::bind(&addr)
.serve(|| service_fn(response_examples))
.map_err(|e| eprintln!("server error: {}", e));
println!("Listening on http://{}", addr);
hyper::rt::run(server);
}
type ResponseFuture = Box<dyn Future<Item=Response<Body>, Error=io::Error> + Send>;
fn response_examples(req: Request<Body>) -> ResponseFuture {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") | (&Method::GET, "/index.html") | (&Method::GET, "/big_file.html") => {
simple_file_send(INDEX)
},
(&Method::GET, "/no_file.html") => {
// Test what happens when file cannot be be found
simple_file_send("this_file_should_not_exist.html")
},
_ => {
Box::new(future::ok(Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::empty())
.unwrap()))
}
}
}
fn simple_file_send(f: &str) -> ResponseFuture {
// Serve a file by asynchronously reading it entirely into memory.
// Uses tokio_fs to open file asynchronously, then tokio_io to read into
// memory asynchronously.
let filename = f.to_string(); // we need to copy for lifetime issues
Box::new(tokio_fs::file::File::open(filename)
.and_then(|file| {
let buf: Vec<u8> = Vec::new();
tokio_io::io::read_to_end(file, buf)
.and_then(|item| {
Ok(Response::new(item.1.into()))
})
.or_else(|_| {
Ok(Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(Body::empty())
.unwrap())
})
})
.or_else(|_| {
Ok(Response::builder()
.status(StatusCode::NOT_FOUND)
.body(NOTFOUND.into())
.unwrap())
}))
}