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use std::collections::HashMap;
use std::error::Error as StdError;
use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};
use hyper::service::Service;
use hyper::{Body, Method, Request, Response};
use route_recognizer::Router as InnerRouter;
pub type Result<T> = std::result::Result<T, Box<dyn StdError + Send + Sync>>;
#[derive(Debug)]
pub struct Error {
inner: String,
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.inner)
}
}
impl StdError for Error {}
#[derive(Debug)]
pub struct Router {
inner: HashMap<Method, InnerRouter<Box<dyn Handler>>>,
}
impl Default for Router {
fn default() -> Self {
Self::new()
}
}
impl Router {
pub fn new() -> Self {
Self {
inner: HashMap::new(),
}
}
pub fn get(&mut self, path: &str, handler: impl Handler) {
let entry = self
.inner
.entry(Method::GET)
.or_insert_with(InnerRouter::new);
entry.add(path, Box::new(handler));
}
pub fn post(&mut self, path: &str, handler: impl Handler) {
let entry = self
.inner
.entry(Method::POST)
.or_insert_with(InnerRouter::new);
entry.add(path, Box::new(handler));
}
pub fn put(&mut self, path: &str, handler: impl Handler) {
let entry = self
.inner
.entry(Method::PUT)
.or_insert_with(InnerRouter::new);
entry.add(path, Box::new(handler));
}
pub fn delete(&mut self, path: &str, handler: impl Handler) {
let entry = self
.inner
.entry(Method::DELETE)
.or_insert_with(InnerRouter::new);
entry.add(path, Box::new(handler));
}
pub fn patch(&mut self, path: &str, handler: impl Handler) {
let entry = self
.inner
.entry(Method::PATCH)
.or_insert_with(InnerRouter::new);
entry.add(path, Box::new(handler));
}
pub fn serve(
&self,
mut req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>>> + Send + Sync>> {
match self.inner.get(req.method()) {
Some(inner_router) => match inner_router.recognize(req.uri().path()) {
Ok(matcher) => {
let handler = matcher.handler();
let params = matcher.params().clone();
req.extensions_mut().insert(Params(Box::new(params)));
handler.call(req)
}
Err(e) => Box::pin(async {
Err(Box::new(Error { inner: e }) as Box<dyn StdError + Send + Sync>)
}),
},
None => {
Box::pin(async { Ok(Response::builder().status(404).body(Body::empty()).unwrap()) })
}
}
}
pub fn into_service(self) -> MakeRouterService<RouterService> {
MakeRouterService {
inner: RouterService::new(self),
}
}
}
pub trait Handler: Send + Sync + 'static {
fn call(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>>> + Send + Sync>>;
}
impl<F: Send + Sync + 'static, R> Handler for F
where
F: Fn(Request<Body>) -> R + Send + Sync,
R: Future<Output = Result<Response<Body>>> + Send + Sync + 'static,
{
fn call(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>>> + Send + Sync>> {
Box::pin(self(req))
}
}
impl fmt::Debug for dyn Handler {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
writeln!(f, "keiro::Handler")
}
}
#[derive(Clone)]
pub struct RouterService(Arc<Router>);
impl Service<Request<Body>> for RouterService {
type Response = Response<Body>;
type Error = Box<dyn StdError + Send + Sync>;
type Future = Pin<Box<dyn Future<Output = Result<Response<Body>>> + Send + Sync>>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<()>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request<Body>) -> Self::Future {
self.0.serve(req)
}
}
impl RouterService {
pub fn new(router: Router) -> Self {
Self(Arc::new(router))
}
}
pub struct MakeRouterService<Svc> {
pub inner: Svc,
}
impl<T, Svc> Service<T> for MakeRouterService<Svc>
where
Svc: Service<Request<Body>> + Clone,
Svc::Response: 'static,
Svc::Error: Into<Box<dyn StdError + Send + Sync>> + 'static,
Svc::Future: 'static,
{
type Response = Svc;
type Error = Box<dyn StdError + Send + Sync>;
type Future = futures_util::future::Ready<Result<Self::Response>>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<()>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, _req: T) -> Self::Future {
futures_util::future::ok(self.inner.clone())
}
}
pub struct Params(Box<route_recognizer::Params>);
impl Params {
pub fn find(&self, key: &str) -> Option<&str> {
self.0.find(key)
}
}