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#![allow(dead_code)]
use std::{borrow::Cow, cell::OnceCell, collections::HashMap, pin::Pin, sync::Arc};
use tokio::{io::{self, AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader}, net::{TcpListener, TcpStream, ToSocketAddrs}, sync::Mutex, time::{timeout, Duration}};
use crate::{Context, Handler::{self, *}, HandlerFunc, Request, RequestType, Responder, Response};
async fn res_request(mut stream: TcpStream,msg: &str, res: &str) {
let _ = stream.write_all(format!("HTTP/1.1 {}\r\nContent-Length: {}\r\n\r\n{}", msg, res.len(), res).as_bytes()).await;
let _ = stream.flush().await;
}
/// The main struct in the crate.
/// Allows you to create HTTP web servers.
pub struct HttpServer<State = ()> {
routes: std::sync::Mutex<HashMap<(RequestType, Cow<'static, str>), Handler<State>>>,
state: Mutex<Arc<Option<State>>>
}
impl<State: Send + Sync + 'static> HttpServer<State> {
/// Returns an instance of HttpServer
pub fn new() -> HttpServer<State> {
HttpServer {
routes: std::sync::Mutex::new(HashMap::new()),
state: Mutex::new(Arc::new(None)),
}
}
/// Sets the server state, State is kept inside a Arc<Option<()>>
///
/// # Examples
///
/// ```
/// async fn index(_res: Responder, ctx: Context<i32>) {
/// assert_eq!(ctx.state.unwrap(), 0);
/// }
///
/// #[tokio::main]
/// async fn main() {
/// let server = HttpServer::new();
///
/// server.manage(0);
/// server.on(Get, "/", index);
///
/// server.listen("127.0.0.1:8000").await.unwrap();
/// }
/// ```
pub fn manage(&self, state: State)
{
(*self.state.try_lock().unwrap()) = Arc::new(Some(state));
}
/// Maps a route handler to the specified route signature (eg. ("GET", "/"))
///
/// # Examples
///
/// ```
/// async fn index(res: Responder, ctx: Context) {
/// res.respond(ctx.response.body).await.unwwrap();
/// }
///
/// #[tokio::main]
/// async fn main() {
/// let server = HttpServer::new();
///
/// server.on(Get, "/", index);
///
/// server.listen("127.0.0.1:8000").await.unwrap();
/// }
/// ```
pub fn on<T, U>(&self, req_type: RequestType, route: U, handler: T)
where
U: Into<Cow<'static, str>>,
T: HandlerFunc<State> + 'static
{
self.routes.lock().unwrap().insert((req_type, route.into()), Handler::Active(Box::new(handler)));
}
/// Serves static information, under the hood, it calls a Responder.
///
/// # Examples
///
/// ```
/// #[tokio::main]
/// async fn main() {
/// let server = HttpServer::new();
/// let res = HttpResponse::new();
///
/// res.body("Hello World");
/// server.on_static(Get, "/", res);
///
/// server.listen("127.0.0.1:8000").await.unwrap();
/// }
/// ```
pub fn on_static<T, U>(&self, req_type: RequestType, route: U, res: T)
where
U: Into<Cow<'static, str>>,
T: Response + 'static
{
self.routes.lock().unwrap().insert((req_type, route.into()), Handler::Static(Box::new(res)));
}
/// Activates the HttpServer
pub async fn listen<A: ToSocketAddrs>(self, addr: A) -> io::Result<()> {
let listener = TcpListener::bind(addr).await?;
let routes = Arc::new(self.routes.into_inner().unwrap());
let state = self.state.into_inner();
loop {
let stream = if let Ok(e) = listener.accept().await {e.0} else {continue;};
let routes = routes.clone();
let state = Arc::clone(&state);
tokio::spawn(async move {
let mut reader = BufReader::new(stream);
let mut first_line = String::new();
if let Err(_) = timeout(Duration::from_millis(100), reader.read_line(&mut first_line)).await {
let stream = reader.into_inner();
res_request(stream, "400 BAD REQUEST", "").await;
return;
};
let first_line: Vec<&str> = first_line.split(" ").collect();
if first_line.len() != 3 {
let stream = reader.into_inner();
res_request(stream, "400 BAD REQUEST", "").await;
return;
}
let request_type = first_line[0];
let (request_route, query_str) = match first_line[1].split_once("?") {
Some(e) => e,
_ => (first_line[1], "")
};
let request_type = match RequestType::try_from(request_type) {
Ok(e) => {e},
_ => {
let stream = reader.into_inner();
res_request(stream, "400 BAD REQUEST", "").await;
return;
}
};
let handler;
if let Some(route_handler) = routes.get(&(request_type, Cow::Borrowed(request_route))) {
handler = route_handler;
} else {
let stream = reader.into_inner();
res_request(stream, "404 NOT FOUND", "<h1>404 NOT FOUND</h1>").await;
return;
}
match handler {
Static(res) => {
let stream = reader.into_inner();
let responder = Responder::new(stream);
let _ = responder.respond(res).await;
},
Active(handler) => {
let mut line = String::new();
let mut headers = Vec::new();
let mut content_length = None;
let mut body = String::new();
let mut query = HashMap::new();
for q in query_str.split("&") {
if let Some((name, value)) = q.split_once("=") {
query.insert(name.to_string(), value.to_string());
}
}
let c_l_str = "Content-Length".to_string();
loop {
reader.read_line(&mut line).await.unwrap();
if &line[..] == "\r\n" {
break;
}
let split = match line.split_once(": ") {
Some(s) => (s.0.to_string(), s.1.to_string()),
_ => {continue;}
};
if split.0 == c_l_str {
content_length = Some(split.1.clone())
}
headers.push(split);
line.clear();
}
if let Some(length) = content_length {
let length = match length.trim().parse::<usize>() {
Ok(l) => l,
_ => {0}
};
let mut data_buf = vec![0u8; length];
if timeout(Duration::from_millis(100), reader.read_exact(&mut data_buf)).await.is_ok() {
body = String::from_utf8_lossy(&data_buf[..]).to_string();
}
}
let stream = reader.into_inner();
let responder = Responder::new(stream);
let ctx = Context {
request: Request {body, headers, query},
state,
};
handler.call(responder, ctx).await;
},
}
});
}
}
}