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Add hello server example

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This commit is contained in:
Laurens Miers 2021-05-25 23:44:59 +02:00
parent 4a96584615
commit 04171cde74
5 changed files with 185 additions and 0 deletions
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11
hello_server/404.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Hello!</title>
</head>
<body>
<h1>Oops!</h1>
<p>Sorry, I don't know what you're asking for.</p>
</body>
</html>

9
hello_server/Cargo.toml Normal file
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[package]
name = "hello_server"
version = "0.1.0"
authors = ["Laurens Miers <laurens.miers@mind.be>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

11
hello_server/hello.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Hello!</title>
</head>
<body>
<h1>Hello!</h1>
<p>Hi from Rust</p>
</body>
</html>

53
hello_server/src/bin/main.rs Normal file
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use std::fs;
use std::thread;
use std::time::Duration;
use std::io::prelude::*;
use std::net::TcpListener;
use std::net::TcpStream;
use hello_server::ThreadPool;
fn main() {
let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
let pool = ThreadPool::new(4);
for stream in listener.incoming() {
let stream = stream.unwrap();
pool.execute(|| {
handle_connection(stream);
});
}
println!("Shutting down.");
}
fn handle_connection(mut stream: TcpStream) {
let mut buffer = [0; 1024];
stream.read(&mut buffer).unwrap();
let get = b"GET / HTTP/1.1\r\n";
let sleep = b"GET /sleep HTTP/1.1\r\n";
let (status_line, filename) = if buffer.starts_with(get) {
("HTTP/1.1 200 OK", "hello.html")
} else if buffer.starts_with(sleep) {
thread::sleep(Duration::from_secs(5));
("HTTP/1.1 200 OK", "hello.html")
} else {
("HTTP/1.1 404 NOT FOUND", "404.html")
};
let contents = fs::read_to_string(filename).unwrap();
let response = format!(
"{}\r\nContent-Length: {}\r\n\r\n{}",
status_line,
contents.len(),
contents
);
stream.write(response.as_bytes()).unwrap();
stream.flush().unwrap();
}

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hello_server/src/lib.rs Normal file
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use std::thread;
use std::sync::mpsc;
use std::sync::Arc;
use std::sync::Mutex;
pub struct ThreadPool {
workers: Vec<Worker>,
sender: mpsc::Sender<Message>,
}
type Job = Box<dyn FnOnce() + Send + 'static>;
enum Message {
NewJob(Job),
Terminate,
}
impl ThreadPool {
/// Create a new ThreadPool.
///
/// The size is the number of threads in the pool.
///
/// # Panics
///
/// The `new` function will panic if the size is zero.
pub fn new(size: usize) -> 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 {
workers.push(Worker::new(id, Arc::clone(&receiver)));
}
ThreadPool { workers: workers, sender: sender }
}
pub fn execute<F>(&self, f: F)
where
F: FnOnce() + Send + 'static,
{
let job = Box::new(f);
self.sender.send(Message::NewJob(job)).unwrap();
}
}
impl Drop for ThreadPool {
fn drop(&mut self) {
println!("Sending terminate message to all workers");
for _ in &mut self.workers {
self.sender.send(Message::Terminate).unwrap();
}
println!("Shutting down all workers...");
for worker in &mut self.workers {
println!("Shutting down worker {}", worker.id);
if let Some(thread) = worker.thread.take() {
thread.join().unwrap();
}
}
}
}
struct Worker {
id: usize,
thread: Option<thread::JoinHandle<()>>,
}
impl Worker {
fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker {
let phandle = thread::spawn(move || loop {
let message = receiver.lock().unwrap().recv().unwrap();
match message {
Message::NewJob(job) => {
println!("Worker {} got a job; executing...", id);
job();
println!("Worker {} did its job!", id);
}
Message::Terminate => {
println!("Worker {} was told to terminate!", id);
break;
}
}
});
Worker { id: id, thread: Some(phandle) }
}
}