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use std::net::SocketAddr;
use std::sync::Arc;
use hyper::{
header,
service::{make_service_fn, service_fn},
Body, Request, Response, Server, StatusCode,
};
use crate::context::Context;
use crate::error::ObsidianError;
use crate::middleware::Middleware;
use crate::router::{ContextResult, Handler, RouteValueResult, Router};
#[derive(Clone)]
pub struct DefaultAppState {}
#[derive(Default)]
pub struct App<T = DefaultAppState>
where
T: Clone + Send + Sync + 'static,
{
router: Router,
app_state: Option<T>,
}
impl<T> App<T>
where
T: Clone + Send + Sync + 'static,
{
pub fn new() -> Self {
App {
router: Router::new(),
app_state: None,
}
}
pub fn get(&mut self, path: &str, handler: impl Handler) {
self.router.get(path, handler);
}
pub fn post(&mut self, path: &str, handler: impl Handler) {
self.router.post(path, handler);
}
pub fn put(&mut self, path: &str, handler: impl Handler) {
self.router.put(path, handler);
}
pub fn patch(&mut self, path: &str, handler: impl Handler) {
self.router.patch(path, handler);
}
pub fn delete(&mut self, path: &str, handler: impl Handler) {
self.router.delete(path, handler);
}
pub fn use_service_to(&mut self, path: &str, middleware: impl Middleware) {
self.router.use_service_to(path, middleware);
}
pub fn use_service(&mut self, middleware: impl Middleware) {
self.router.use_service(middleware);
}
pub fn use_router(&mut self, path: &str, router: Router) {
self.router.use_router(path, router);
}
pub fn use_static_to(&mut self, virtual_path: &str, dir_path: &str) {
self.router.use_static_to(virtual_path, dir_path);
}
pub fn use_static(&mut self, dir_path: &str) {
self.router.use_static(dir_path);
}
pub fn set_app_state(&mut self, app_state: T) {
self.app_state = Some(app_state);
}
pub async fn listen(self, addr: &SocketAddr, callback: impl Fn()) {
let app_server: AppServer = AppServer {
router: self.router,
};
let app_state = self.app_state;
let service = make_service_fn(move |_| {
let server_clone = app_server.clone();
let app_state = app_state.clone();
async {
Ok::<_, hyper::Error>(service_fn(move |req| {
let route_value = server_clone.router.search_route(req.uri().path());
AppServer::resolve_endpoint(req, route_value, app_state.clone())
}))
}
});
let server = Server::bind(&addr).serve(service);
callback();
server.await.map_err(|_| println!("Server error")).unwrap();
}
}
#[derive(Clone)]
struct AppServer {
router: Router,
}
impl AppServer {
pub async fn resolve_endpoint<T>(
req: Request<Body>,
route_value: Option<RouteValueResult>,
app_state: Option<T>,
) -> Result<Response<Body>, hyper::Error>
where
T: Send + Sync + 'static,
{
match route_value {
Some(route_value) => {
let route = match route_value.get_route(req.method()) {
Some(r) => r,
None => return Ok::<_, hyper::Error>(page_not_found()),
};
let middlewares = route_value.get_middlewares();
let params = route_value.get_params();
let mut context = Context::new(req, params);
let executor = EndpointExecutor::new(&route.handler, middlewares);
if let Some(state) = app_state {
context.add::<T>(state);
}
let route_result = executor.next(context).await;
let route_response = match route_result {
Ok(ctx) => {
let mut res = Response::builder();
if let Some(response) = ctx.take_response() {
if let Some(headers) = response.headers() {
if let Some(response_headers) = res.headers_mut() {
headers.iter().for_each(move |(key, value)| {
response_headers
.insert(key, header::HeaderValue::from_static(value));
});
}
}
res.status(response.status()).body(response.body())
} else {
res.status(StatusCode::OK).body(Body::from(""))
}
}
Err(err) => {
let body = Body::from(err.to_string());
Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(body)
}
};
Ok::<_, hyper::Error>(route_response.unwrap_or_else(|_| {
internal_server_error(ObsidianError::GeneralError(
"Error while constructing response body".to_string(),
))
}))
}
_ => Ok::<_, hyper::Error>(page_not_found()),
}
}
}
fn page_not_found() -> Response<Body> {
let mut server_response = Response::new(Body::from("404 Not Found"));
*server_response.status_mut() = StatusCode::NOT_FOUND;
server_response
}
fn internal_server_error(err: impl std::error::Error) -> Response<Body> {
let body = Body::from(err.to_string());
Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(body)
.unwrap()
}
pub struct EndpointExecutor<'a> {
pub route_endpoint: &'a Arc<dyn Handler>,
pub middleware: &'a [Arc<dyn Middleware>],
}
impl<'a> EndpointExecutor<'a> {
pub fn new(
route_endpoint: &'a Arc<dyn Handler>,
middleware: &'a [Arc<dyn Middleware>],
) -> Self {
EndpointExecutor {
route_endpoint,
middleware,
}
}
pub async fn next(mut self, context: Context) -> ContextResult {
if let Some((current, all_next)) = self.middleware.split_first() {
self.middleware = all_next;
current.handle(context, self).await
} else {
self.route_endpoint.call(context).await
}
}
}
#[cfg(test)]
mod test {
use super::*;
use async_std::task;
use hyper::{body, body::Buf, StatusCode};
#[test]
fn test_app_server_resolve_endpoint() {
task::block_on(async {
let mut router = Router::new();
router.get("/", |mut ctx: Context| async move {
let body = ctx.take_body();
let request_body = match body::aggregate(body).await {
Ok(buf) => String::from_utf8(buf.bytes().to_vec()),
_ => {
panic!();
}
};
assert_eq!(ctx.uri().path(), "/");
assert_eq!(request_body.unwrap(), "test_app_server");
ctx.build("test_app_server").ok()
});
let app_server = AppServer { router };
let req_builder = Request::builder();
let req = req_builder
.uri("/")
.body(Body::from("test_app_server"))
.unwrap();
let route_value = app_server.router.search_route(req.uri().path());
let actual_response =
AppServer::resolve_endpoint::<DefaultAppState>(req, route_value, None)
.await
.unwrap();
let mut expected_response = Response::new(Body::from("test_app_server"));
*expected_response.status_mut() = StatusCode::OK;
assert_eq!(actual_response.status(), expected_response.status());
let actual_res_body = match body::aggregate(actual_response).await {
Ok(buf) => String::from_utf8(buf.bytes().to_vec()),
_ => panic!(),
};
let expected_res_body = match body::aggregate(expected_response).await {
Ok(buf) => String::from_utf8(buf.bytes().to_vec()),
_ => panic!(),
};
assert_eq!(actual_res_body.unwrap(), expected_res_body.unwrap());
})
}
}