2021-03-18 11:30:33 +13:00
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use cookie::Cookie;
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use futures_lite::{future::Boxed, Future, FutureExt};
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use hyper::{
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header::HeaderValue,
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service::{make_service_fn, service_fn},
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HeaderMap,
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};
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use hyper::{Body, Method, Request, Response, Server as HyperServer};
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use route_recognizer::{Params, Router};
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use std::{pin::Pin, result::Result};
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use time::Duration;
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type BoxResponse = Pin<Box<dyn Future<Output = Result<Response<Body>, String>> + Send>>;
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pub struct Route<'a> {
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router: &'a mut Router<fn(Request<Body>) -> BoxResponse>,
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path: String,
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}
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pub struct Server {
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pub default_headers: HeaderMap,
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router: Router<fn(Request<Body>) -> BoxResponse>,
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}
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#[macro_export]
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macro_rules! headers(
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{ $($key:expr => $value:expr),+ } => {
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{
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let mut m = hyper::HeaderMap::new();
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$(
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if let Ok(val) = hyper::header::HeaderValue::from_str($value) {
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m.insert($key, val);
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}
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)+
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m
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}
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};
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);
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pub trait RequestExt {
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fn params(&self) -> Params;
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fn param(&self, name: &str) -> Option<String>;
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fn set_params(&mut self, params: Params) -> Option<Params>;
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fn cookies(&self) -> Vec<Cookie>;
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fn cookie(&self, name: &str) -> Option<Cookie>;
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}
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pub trait ResponseExt {
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fn cookies(&self) -> Vec<Cookie>;
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fn insert_cookie(&mut self, cookie: Cookie);
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fn remove_cookie(&mut self, name: String);
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}
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impl RequestExt for Request<Body> {
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fn params(&self) -> Params {
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self.extensions().get::<Params>().unwrap_or(&Params::new()).clone()
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// self.extensions()
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// .get::<RequestMeta>()
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// .and_then(|meta| meta.route_params())
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// .expect("Routerify: No RouteParams added while processing request")
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}
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fn param(&self, name: &str) -> Option<String> {
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self.params().find(name).map(std::borrow::ToOwned::to_owned)
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}
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fn set_params(&mut self, params: Params) -> Option<Params> {
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self.extensions_mut().insert(params)
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}
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fn cookies(&self) -> Vec<Cookie> {
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self.headers().get("Cookie").map_or(Vec::new(), |header| {
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header
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.to_str()
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.unwrap_or_default()
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.split("; ")
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.map(|cookie| Cookie::parse(cookie).unwrap_or_else(|_| Cookie::named("")))
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.collect()
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})
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}
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fn cookie(&self, name: &str) -> Option<Cookie> {
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self.cookies().into_iter().find(|c| c.name() == name)
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}
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}
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impl ResponseExt for Response<Body> {
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fn cookies(&self) -> Vec<Cookie> {
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self.headers().get("Cookie").map_or(Vec::new(), |header| {
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header
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.to_str()
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.unwrap_or_default()
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.split("; ")
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.map(|cookie| Cookie::parse(cookie).unwrap_or_else(|_| Cookie::named("")))
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.collect()
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})
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}
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fn insert_cookie(&mut self, cookie: Cookie) {
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if let Ok(val) = HeaderValue::from_str(&cookie.to_string()) {
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self.headers_mut().append("Set-Cookie", val);
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}
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}
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fn remove_cookie(&mut self, name: String) {
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let mut cookie = Cookie::named(name);
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cookie.set_path("/");
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cookie.set_max_age(Duration::second());
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if let Ok(val) = HeaderValue::from_str(&cookie.to_string()) {
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self.headers_mut().append("Set-Cookie", val);
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}
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}
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}
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impl Route<'_> {
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fn method(&mut self, method: Method, dest: fn(Request<Body>) -> BoxResponse) -> &mut Self {
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self.router.add(&format!("/{}{}", method.as_str(), self.path), dest);
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self
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}
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/// Add an endpoint for `GET` requests
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pub fn get(&mut self, dest: fn(Request<Body>) -> BoxResponse) -> &mut Self {
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self.method(Method::GET, dest)
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}
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/// Add an endpoint for `POST` requests
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pub fn post(&mut self, dest: fn(Request<Body>) -> BoxResponse) -> &mut Self {
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self.method(Method::POST, dest)
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}
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}
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impl Server {
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pub fn new() -> Self {
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Server {
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default_headers: HeaderMap::new(),
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router: Router::new(),
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}
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}
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pub fn at(&mut self, path: &str) -> Route {
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Route {
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path: path.to_owned(),
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router: &mut self.router,
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}
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}
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pub fn listen(self, addr: String) -> Boxed<Result<(), hyper::Error>> {
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let make_svc = make_service_fn(move |_conn| {
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// For correct borrowing, these values need to be borrowed
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let router = self.router.clone();
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let default_headers = self.default_headers.clone();
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// This is the `Service` that will handle the connection.
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// `service_fn` is a helper to convert a function that
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// returns a Response into a `Service`.
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// let shared_router = router.clone();
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async move {
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Ok::<_, String>(service_fn(move |req: Request<Body>| {
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let headers = default_headers.clone();
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// Remove double slashes
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let mut path = req.uri().path().replace("//", "/");
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// Remove trailing slashes
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if path != "/" && path.ends_with('/') {
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path.pop();
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}
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// Match the visited path with an added route
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match router.recognize(&format!("/{}{}", req.method().as_str(), path)) {
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// If a route was configured for this path
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Ok(found) => {
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let mut parammed = req;
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parammed.set_params(found.params().clone());
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// Run the route's function
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let func = (found.handler().to_owned().to_owned())(parammed);
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async move {
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let res: Result<Response<Body>, String> = func.await;
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// Add default headers to response
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res.map(|mut response| {
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response.headers_mut().extend(headers);
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response
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})
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}
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.boxed()
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}
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// If there was a routing error
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Err(e) => async move {
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// Return a 404 error
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let res: Result<Response<Body>, String> = Ok(Response::builder().status(404).body(e.into()).unwrap_or_default());
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// Add default headers to response
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res.map(|mut response| {
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response.headers_mut().extend(headers);
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response
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})
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}
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.boxed(),
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}
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}))
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}
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});
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// Build SocketAddr from provided address
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let address = &addr.parse().unwrap_or_else(|_| panic!("Cannot parse {} as address (example format: 0.0.0.0:8080)", addr));
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// Bind server to address specified above. Gracefully shut down if CTRL+C is pressed
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let server = HyperServer::bind(address).serve(make_svc).with_graceful_shutdown(async {
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// Wait for the CTRL+C signal
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tokio::signal::ctrl_c().await.expect("Failed to install CTRL+C signal handler");
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});
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server.boxed()
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}
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}
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