5d3c472228
**The `Error` is now an opaque struct**, which allows for more variants to be added freely, and the internal representation to change without being breaking changes. For inspecting an `Error`, there are several `is_*` methods to check for certain classes of errors, such as `Error::is_parse()`. The `cause` can also be inspected, like before. This likely seems like a downgrade, but more inspection can be added as needed! The `Error` now knows about more states, which gives much more context around when a certain error occurs. This is also expressed in the description and `fmt` messages. **Most places where a user would provide an error to hyper can now pass any error type** (`E: Into<Box<std::error::Error>>`). This error is passed back in relevant places, and can be useful for logging. This should make it much clearer about what error a user should provide to hyper: any it feels is relevant! Closes #1128 Closes #1130 Closes #1431 Closes #1338 BREAKING CHANGE: `Error` is no longer an enum to pattern match over, or to construct. Code will need to be updated accordingly. For body streams or `Service`s, inference might be unable to determine what error type you mean to return. Starting in Rust 1.26, you could just label that as `!` if you never return an error.
149 lines
5.6 KiB
Rust
149 lines
5.6 KiB
Rust
#![deny(warnings)]
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extern crate futures;
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extern crate hyper;
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extern crate pretty_env_logger;
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extern crate tokio;
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use futures::{Future/*, Sink*/};
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use futures::future::lazy;
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use futures::sync::oneshot;
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use hyper::{Body, /*Chunk,*/ Method, Request, Response, StatusCode};
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use hyper::server::{Http, Service};
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use std::fs::File;
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use std::io::{self, copy/*, Read*/};
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use std::thread;
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static NOTFOUND: &[u8] = b"Not Found";
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static INDEX: &str = "examples/send_file_index.html";
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fn simple_file_send(f: &str) -> Box<Future<Item = Response<Body>, Error = io::Error> + Send> {
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// Serve a file by reading it entirely into memory. As a result
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// this is limited to serving small files, but it is somewhat
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// simpler with a little less overhead.
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//
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// On channel errors, we panic with the expect method. The thread
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// ends at that point in any case.
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let filename = f.to_string(); // we need to copy for lifetime issues
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let (tx, rx) = oneshot::channel();
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thread::spawn(move || {
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let mut file = match File::open(filename) {
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Ok(f) => f,
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Err(_) => {
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tx.send(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(NOTFOUND.into())
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.unwrap())
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.expect("Send error on open");
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return;
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},
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};
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let mut buf: Vec<u8> = Vec::new();
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match copy(&mut file, &mut buf) {
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Ok(_) => {
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let res = Response::new(buf.into());
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tx.send(res).expect("Send error on successful file read");
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},
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Err(_) => {
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tx.send(Response::builder()
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.status(StatusCode::INTERNAL_SERVER_ERROR)
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.body(Body::empty())
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.unwrap())
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.expect("Send error on error reading file");
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},
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};
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});
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Box::new(rx.map_err(|e| io::Error::new(io::ErrorKind::Other, e)))
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}
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struct ResponseExamples;
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impl Service for ResponseExamples {
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type Request = Request<Body>;
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type Response = Response<Body>;
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type Error = io::Error;
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type Future = Box<Future<Item = Self::Response, Error = Self::Error> + Send>;
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fn call(&self, req: Request<Body>) -> Self::Future {
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match (req.method(), req.uri().path()) {
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(&Method::GET, "/") | (&Method::GET, "/index.html") => {
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simple_file_send(INDEX)
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},
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(&Method::GET, "/big_file.html") => {
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// Stream a large file in chunks. This requires a
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// little more overhead with two channels, (one for
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// the response future, and a second for the response
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// body), but can handle arbitrarily large files.
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//
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// We use an artificially small buffer, since we have
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// a small test file.
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let (tx, rx) = oneshot::channel();
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thread::spawn(move || {
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let _file = match File::open(INDEX) {
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Ok(f) => f,
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Err(_) => {
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tx.send(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(NOTFOUND.into())
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.unwrap())
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.expect("Send error on open");
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return;
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},
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};
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let (_tx_body, rx_body) = Body::channel();
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let res = Response::new(rx_body.into());
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tx.send(res).expect("Send error on successful file read");
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/* TODO: fix once we have futures 0.2 Sink working
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let mut buf = [0u8; 16];
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loop {
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match file.read(&mut buf) {
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Ok(n) => {
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if n == 0 {
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// eof
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tx_body.close().expect("panic closing");
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break;
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} else {
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let chunk: Chunk = buf[0..n].to_vec().into();
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match tx_body.send_data(chunk).wait() {
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Ok(t) => { tx_body = t; },
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Err(_) => { break; }
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};
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}
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},
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Err(_) => { break; }
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}
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}
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*/
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});
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Box::new(rx.map_err(|e| io::Error::new(io::ErrorKind::Other, e)))
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},
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(&Method::GET, "/no_file.html") => {
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// Test what happens when file cannot be be found
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simple_file_send("this_file_should_not_exist.html")
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},
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_ => {
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Box::new(futures::future::ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::empty())
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.unwrap()))
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}
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}
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}
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}
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fn main() {
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pretty_env_logger::init();
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let addr = "127.0.0.1:1337".parse().unwrap();
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tokio::run(lazy(move || {
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let server = Http::new().bind(&addr, || Ok(ResponseExamples)).unwrap();
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println!("Listening on http://{} with 1 thread.", server.local_addr().unwrap());
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server.run().map_err(|err| eprintln!("Server error {}", err))
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}));
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}
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