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//! Simple and performant HTTP server.
//!
//! Listens for requests and maps them to a handler, if any exists for the specified path.
//! If no handler is matched, return `404 - Not Found`.
//!
//! The server is using Tokio and can support millions of concurrent clients.
use super::{Error, Handler, Request, Response, Router};
use crate::colors::MaybeColorize;
use crate::config::get_config;
use std::net::SocketAddr;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, BufReader, BufWriter};
use tokio::net::{TcpListener, TcpStream};
use tokio::select;
use tokio::signal::ctrl_c;
use tokio::task::JoinHandle;
use tracing::{debug, error, info};
/// Type of TCP connection used by the client.
#[derive(Debug)]
pub enum Stream<'a> {
/// Plain text (not encrypted).
Plain(&'a mut BufReader<BufWriter<TcpStream>>),
}
impl<'a> Stream<'a> {
/// Get the underlying TCP stream reader & writer.
pub fn stream(&'a mut self) -> impl AsyncRead + AsyncWrite + 'a {
match self {
Stream::Plain(stream) => stream,
}
}
}
/// HTTP server.
pub struct Server {
handlers: Arc<Router>,
}
impl Server {
/// Create new HTTP server.
///
/// Accepts a list of routes and their handlers.
// Duplicate handlers are overwritten without warning.
pub fn new(handlers: Vec<Handler>) -> Self {
Server {
handlers: Arc::new(Router::new(handlers).unwrap()),
}
}
/// Launch the server. This blocks until the server is shut down (`SIGINT`/Ctrl-C).
pub async fn launch(self) -> Result<(), Error> {
let config = get_config();
let addr = format!("{}:{}", config.general.host, config.general.port);
info!(
"Starting {} {} {}",
"Rwf".green(),
"HTTP".purple(),
"server".red()
);
self.handlers.log_routes();
let listener = TcpListener::bind(addr).await?;
info!("Listening on {}", listener.local_addr().unwrap());
loop {
select! {
_ = ctrl_c() => {
info!("Shutting down...");
return Ok(());
}
result = listener.accept() => {
if let Ok((stream, peer_addr)) = result {
let handlers = self.handlers.clone();
tokio::spawn(async move {
match Self::handle_connection(handlers, stream, peer_addr).await {
Ok(_) => (),
Err(_) => {
error!("panic detected, this is a bug; controllers should return an error instead");
}
}
});
}
}
}
}
}
fn handle_connection(
handlers: Arc<Router>,
stream: TcpStream,
peer_addr: SocketAddr,
) -> JoinHandle<()> {
let mut stream = BufReader::new(BufWriter::new(stream));
tokio::spawn(async move {
debug!("{} new connection from {:?}", "http".purple(), peer_addr);
loop {
let request = match Request::read(peer_addr, &mut stream).await {
Ok(request) => request,
Err(ref err) => {
match err {
Error::ContentTooLarge(head) => {
let response = Response::content_too_large();
let _ = Self::send_response(&mut stream, response).await;
info!(
"{} {} {} 413",
head.method().to_string().purple(),
head.path().base().purple(),
std::any::type_name::<Self>().green(),
);
}
_ => (),
}
debug!(
"{} client {:?} disconnected: {}",
"http".purple(),
peer_addr,
err
);
return;
}
};
let start = Instant::now();
match handlers.find(request.path()) {
Some(handler) => {
// Set the matching regex to extract parameters.
let request = request.with_params(handler.path_with_regex().params());
// Pass the request to the controller to get a response.
let response = match handler.handle_internal(request.clone()).await {
Ok(response) => response,
Err(err) => {
error!("{}", err);
Response::internal_error(err)
}
};
// Set the session on the request before we pass it down
// to the stream handler.
let request = match response.session().clone() {
Some(session) => request.set_session(session),
None => request,
};
let ok = response.status().ok();
// Calculate duration.
// We include the time to find the handler in the duration.
let duration = start.elapsed();
// Log request.
Self::log(&request, handler.controller_name(), &response, duration);
if let Err(err) = Self::send_response(&mut stream, response).await {
debug!("{} error {:?}", peer_addr, err);
break;
}
if ok {
match handler
.handle_stream(&request, Stream::Plain(&mut stream))
.await
{
Ok(true) => continue,
_ => break,
};
}
}
None => {
// Log duration of search.
let duration = Instant::now() - start;
// Generate default not found response.
let response = Response::not_found();
// Log the response.
Self::log(&request, std::any::type_name::<Self>(), &response, duration);
// Send reply to client.
if let Err(err) = Self::send_response(&mut stream, response).await {
debug!("{} error {:?}", peer_addr, err);
break;
}
}
}
}
})
}
fn log(request: &Request, controller_name: &str, response: &Response, duration: Duration) {
let method = request.method().to_string();
let path = request.path().path();
let code = response.status().code() as i32;
let duration = (duration.as_secs_f64() * 1000.0) as f32;
info!(
"{} {} {} {} ({:.3} ms)",
method.purple(),
path.purple(),
controller_name.green(),
code,
duration,
);
}
async fn send_response(
mut stream: impl AsyncWrite + Unpin,
response: Response,
) -> Result<(), Error> {
response.send(&mut stream).await?;
stream.flush().await?;
Ok(())
}
}