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use crate::http_parser::HttpParser;
use crate::request::Request;
use crate::response::Response;
use std::collections::HashMap;
use std::io::Write;
use std::net::TcpStream;
use std::sync::{mpsc, Arc, Mutex};
use std::thread;
use std::time::Duration;
pub struct ThreadPool {
workers: Vec<Worker>,
sender: mpsc::Sender<Message>,
}
enum Message {
NewJob(TcpStream),
Terminate,
}
impl ThreadPool {
pub fn new(
size: usize,
routes: HashMap<String, fn(Request, Response) -> Response>,
middleware: Vec<(String, fn(Request, Response) -> (Request, Response, bool))>,
) -> ThreadPool {
assert!(size > 0);
let (sender, receiver) = mpsc::channel();
let receiver = Arc::new(Mutex::new(receiver));
let mut workers = Vec::with_capacity(size);
for id in 0..size {
let routes_clone = routes.clone();
let middleware_clone = middleware.clone();
workers.push(Worker::new(
id,
Arc::clone(&receiver),
routes_clone,
middleware_clone,
));
}
ThreadPool { workers, sender }
}
pub fn execute(&self, stream: TcpStream) {
match self.sender.send(Message::NewJob(stream)) {
Ok(_) => {}
Err(error) => {
println!("{}", error);
}
};
}
}
impl Drop for ThreadPool {
fn drop(&mut self) {
println!("Sending terminate message to all workers.");
for _ in &self.workers {
match self.sender.send(Message::Terminate) {
Ok(_) => {}
Err(error) => println!("{}", error),
}
}
println!("Shutting down all workers.");
for worker in &mut self.workers {
println!("Shutting down worker {}", worker.id);
if let Some(thread) = worker.thread.take() {
match thread.join() {
Ok(_) => {}
Err(_error) => println!("Failed to join thread"),
}
}
}
}
}
struct Worker {
id: usize,
thread: Option<thread::JoinHandle<()>>,
}
impl Worker {
fn new(
id: usize,
receiver: Arc<Mutex<mpsc::Receiver<Message>>>,
routes: HashMap<String, fn(Request, Response) -> Response>,
middleware: Vec<(String, fn(Request, Response) -> (Request, Response, bool))>,
) -> Worker {
let thread = thread::spawn(move || 'outer: loop {
let lock = match receiver.lock() {
Ok(lock) => lock,
Err(error) => {
println!("{}", error);
continue 'outer;
}
};
let message = match lock.recv() {
Ok(message) => message,
Err(error) => {
println!("{}", error);
continue 'outer;
}
};
match message {
Message::NewJob(stream) => {
let mut response = Response::new(404, Vec::new(), HashMap::new());
let parse_result = HttpParser::parse(&stream);
let mut request = match parse_result {
Ok(request) => request,
Err(error) => {
println!("HTTP Parser Error: {}", error);
response.status(400);
write_response(stream, response);
continue 'outer;
}
};
let request_wo_params = match request.url.split("?").next() {
Some(url) => url,
None => {
response.status(400);
write_response(stream, response);
continue 'outer;
}
};
let mut request_route = String::from(request_wo_params);
let last_char = match request_route.pop() {
Some(character) => character,
None => {
response.status(500);
response.body("failed to parse http");
write_response(stream, response);
continue 'outer;
}
};
if last_char != '/' || request_route.len() == 0 {
request_route.push(last_char)
}
if routes.contains_key(&request_route) {
for mid in &middleware {
if mid.0.len() > request_route.len() {
break;
};
if mid.0 == request_route[..mid.0.len()] {
let answer = mid.1(request, response);
response = answer.1;
if !answer.2 {
write_response(stream, response);
continue 'outer;
}
request = answer.0;
}
}
response = routes[&request_route](request, response);
}
write_response(stream, response);
}
Message::Terminate => {
println!("Worker {} was told to terminate.", id);
break;
}
}
});
return Worker {
id,
thread: Some(thread),
};
fn write_response(mut stream: TcpStream, response: Response) {
let five_seconds = Duration::new(5, 0);
stream
.set_write_timeout(Some(five_seconds))
.expect("set_write_timeout call failed");
match stream.write(&response.to_http()) {
Ok(_) => {}
Err(e) => println!("Failed sending response: {}", e),
}
}
}
}