|
| 1 | +use std::sync::{Arc, mpsc, Mutex}; |
| 2 | +use std::fs; |
| 3 | +use std::io::prelude::*; |
| 4 | +use std::net::{TcpListener, TcpStream}; |
| 5 | +use std::thread; |
| 6 | +use std::time::Duration; |
| 7 | + |
1 | 8 | fn main() { |
2 | | - println!("Hello, world!"); |
| 9 | + |
| 10 | + let listener = TcpListener::bind("127.0.0.1:7878").unwrap(); |
| 11 | + let pool = ThreadPool::new(4); |
| 12 | + for stream in listener.incoming() { |
| 13 | + pool.execute(|| { |
| 14 | + handle_tcpstream(stream.unwrap()); |
| 15 | + }); |
| 16 | + |
| 17 | + } |
| 18 | +} |
| 19 | + |
| 20 | +fn handle_tcpstream(mut stream: TcpStream) { |
| 21 | + let mut buffer = [0u8; 1024 * 8]; |
| 22 | + stream.read(&mut buffer).unwrap(); |
| 23 | + let get = b"GET / HTTP/1.1\r\n"; |
| 24 | + let sleep = b"GET /sleep HTTP/1.1\r\n"; |
| 25 | + let (status_line, filename) = if buffer.starts_with(get) { |
| 26 | + ("HTTP/1.1 200 OK\r\n\r\n", "hello.html") |
| 27 | + } else if buffer.starts_with(sleep) { |
| 28 | + thread::sleep(Duration::from_secs(5)); |
| 29 | + ("HTTP/1.1 200 OK\r\n\r\n", "hello.html") |
| 30 | + } else { |
| 31 | + ("HTTP/1.1 404 NOT FOUND\r\n\r\n", "404.html") |
| 32 | + }; |
| 33 | + let html = fs::read_to_string(filename).unwrap(); |
| 34 | + let resp = format!("{}{}", status_line, html); |
| 35 | + stream.write(resp.as_bytes()).unwrap(); |
| 36 | + stream.flush().unwrap(); |
| 37 | +} |
| 38 | + |
| 39 | +type Job = Box<dyn FnOnce() + Send + 'static>; |
| 40 | + |
| 41 | +enum Message { |
| 42 | + NewJob(Job), |
| 43 | + Terminate, |
| 44 | +} |
| 45 | +struct Worker { |
| 46 | + id: usize, |
| 47 | + thread: Option<thread::JoinHandle<()>> |
| 48 | +} |
| 49 | + |
| 50 | +impl Worker { |
| 51 | + fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker { |
| 52 | + let thread = thread::spawn(move || loop { |
| 53 | + let msg = receiver.lock().unwrap().recv().unwrap(); |
| 54 | + match msg { |
| 55 | + Message::NewJob(j) => { |
| 56 | + println!("Worker {} got a job; executing.", id); |
| 57 | + j() |
| 58 | + }, |
| 59 | + Message::Terminate => { |
| 60 | + println!("Worker {} was told to terminate.", id); |
| 61 | + break; |
| 62 | + }, |
| 63 | + } |
| 64 | + }); |
| 65 | + Worker{ |
| 66 | + id, |
| 67 | + thread: Some(thread), |
| 68 | + } |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +pub struct ThreadPool { |
| 73 | + workers: Vec<Worker>, |
| 74 | + sender: mpsc::Sender<Message>, |
| 75 | + |
| 76 | +} |
| 77 | + |
| 78 | +impl ThreadPool { |
| 79 | + pub fn new(size: usize) -> ThreadPool { |
| 80 | + let mut workers = Vec::with_capacity(size); |
| 81 | + let (sender, rec) = mpsc::channel(); |
| 82 | + let receiver = Arc::new(Mutex::new(rec)); |
| 83 | + for id in 0..size { |
| 84 | + workers.push(Worker::new(id, Arc::clone(&receiver))); |
| 85 | + } |
| 86 | + ThreadPool{ |
| 87 | + workers, |
| 88 | + sender, |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + pub fn execute<T>(&self, t: T) |
| 93 | + where |
| 94 | + T: FnOnce() + Send + 'static, |
| 95 | + { |
| 96 | + let job = Box::new(t); |
| 97 | + self.sender.send(Message::NewJob(job)).unwrap(); |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +impl Drop for ThreadPool { |
| 102 | + fn drop(&mut self) { |
| 103 | + println!("Sending terminate message to all workers."); |
| 104 | + for _ in &self.workers { |
| 105 | + self.sender.send(Message::Terminate).unwrap(); |
| 106 | + } |
| 107 | + println!("Shutting down all workers."); |
| 108 | + |
| 109 | + for worker in &mut self.workers { |
| 110 | + println!("Shutting down worker {}", worker.id); |
| 111 | + if let Some(thread) = worker.thread.take() { |
| 112 | + thread.join().unwrap(); |
| 113 | + } |
| 114 | + } |
| 115 | + } |
3 | 116 | } |
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