70 lines
2.0 KiB
Rust
70 lines
2.0 KiB
Rust
use crate::utils::MyResult;
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use std::future::Future;
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use std::pin::Pin;
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use std::vec::Vec;
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use web_sys::*;
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// We have to box everything in order to make them fit in a Vec
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type RouteHandler = Box<dyn Sync + Fn(Request, Url) -> Pin<Box<dyn Future<Output = MyResult<Response>>>>>;
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// Convert a async function to RouteHandler
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// both boxes the function and the returned Future
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macro_rules! async_fn_boxed {
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($f:ident) => {
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Box::new(move |req, url| Box::pin($f(req, url)))
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};
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}
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struct Route {
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path: String,
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handler: RouteHandler
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}
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pub struct Router {
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routes: Vec<Route>,
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default_handler: RouteHandler
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}
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impl Router {
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pub fn new<F, T>(default_handler: &'static F) -> Router
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where F: Sync + Fn(Request, Url) -> T,
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T: 'static + Future<Output = MyResult<Response>> {
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Router {
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routes: vec![],
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default_handler: async_fn_boxed!(default_handler)
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}
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}
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pub fn add_route<F, T>(
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&mut self,
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path: &str,
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handler: &'static F
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) where F: Sync + Fn(Request, Url) -> T,
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T: 'static + Future<Output = MyResult<Response>>
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{
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self.routes.push(Route {
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path: path.into(),
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handler: async_fn_boxed!(handler)
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});
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}
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pub async fn execute(&self, req: Request, url: Url) -> MyResult<Response> {
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for route in self.routes.iter() {
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// Routes added earlier overrides routes added later
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// e.g. if '/path/aaa' was added before '/path/', then
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// calls to '/path/aaa' will not be dispatched to '/path/'
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// Routes ending with '/' are considered prefixes.
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if route.path.ends_with("/") {
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if url.pathname().starts_with(&route.path) {
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return (route.handler)(req, url).await;
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}
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} else {
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if url.pathname() == route.path {
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return (route.handler)(req, url).await;
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}
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}
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}
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return (self.default_handler)(req, url).await;
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}
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} |