initial commit

2023-07-03 16:44:57 -05:00 · 2023-07-03 16:44:57 -05:00 · 943697af65
commit 943697af65
parent 4f6f5c3373
9 changed files with 231 additions and 1 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1 @@
+/target
--- a/Cargo.lock
+++ b/Cargo.lock
@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust-webserver"
+version = "0.1.0"
--- a/Cargo.toml
+++ b/Cargo.toml
@ -0,0 +1,14 @@
+[package]
+name = "rust-webserver"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[profile.release]
+lto = true
+strip = true
+panic = "abort"
+codegen-units = 1
--- a/README.md
+++ b/README.md
@ -1,3 +1,13 @@
 # rust-webserver

-Very basic multithreaded TCP server in Rust
+Very basic multithreaded TCP server in Rust.
+
+See `src/main.rs`. Server will listen for a certain number of connections on a
+given TCP port, and then gracefully exit.
+
+This project is taken from The Rust Book.
+
+**Run:**
+```
+cargo run --release
+```
--- a/html/404.html
+++ b/html/404.html
@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Error!</title>
+  </head>
+  <body>
+    <h1>Oops!</h1>
+    <p>Sorry, I don't know what you're asking for.</p>
+  </body>
+</html>
--- a/html/index.html
+++ b/html/index.html
@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Welcome!</title>
+  </head>
+  <body>
+    <h1>Hello!</h1>
+    <p>Hi from Rust</p>
+  </body>
+</html>
--- a/html/slow.html
+++ b/html/slow.html
@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>That took a while</title>
+  </head>
+  <body>
+    <h1>Hi</h1>
+    <p>You just waited 5secs to see this page.</p>
+  </body>
+</html>
--- a/src/lib.rs
+++ b/src/lib.rs
@ -0,0 +1,103 @@
+use std::{
+    fmt::Display,
+    thread,
+    error::Error,
+    sync::{
+        mpsc,
+        Arc,
+        Mutex,
+    },
+};
+
+pub struct ThreadPool {
+    workers: Vec<Worker>,
+    sender: Option<mpsc::Sender<Job>>,
+}
+
+type Job = Box<dyn FnOnce() + Send + 'static>;
+
+struct Worker {
+    id: usize,
+    thread: Option<thread::JoinHandle<()>>,
+}
+
+impl Worker {
+    fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>) -> Worker {
+        Worker { id, thread: Some(thread::spawn(move || {
+            loop {
+                match (*receiver).lock().unwrap().recv() {
+                    Ok(job) => {
+                        println!("Worker {} got a job... running.", id);
+                        job();
+                    },
+                    Err(_) => {
+                        println!("Worker {} stopping.", id);
+                        break;
+                    },
+                }
+            }
+        }))}
+    }
+}
+
+#[derive(Debug)]
+pub enum ThreadPoolError {
+    ZeroSize
+}
+
+impl Error for ThreadPoolError {
+    fn description(&self) -> &str {
+        match *self {
+            ThreadPoolError::ZeroSize => "ZeroPoolSize",
+        }
+    }
+}
+
+impl Display for ThreadPoolError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match *self {
+            ThreadPoolError::ZeroSize =>
+                f.write_str("Thread pool size is zero"),
+        }
+    }
+}
+
+impl ThreadPool {
+    pub fn new(size: usize) -> Result<ThreadPool, ThreadPoolError> {
+        if size == 0 {
+            return Err(ThreadPoolError::ZeroSize);
+        }
+
+        let mut workers: Vec<Worker> = Vec::with_capacity(size);
+        let (sender, receiver) = mpsc::channel();
+
+        let receiver = Arc::new(Mutex::new(receiver));
+
+        for i in 0..size {
+            workers.push(Worker::new(i, Arc::clone(&receiver)));
+        }
+
+        Ok(ThreadPool { workers, sender: Some(sender) })
+    }
+
+    pub fn execute<F>(&self, f: F)
+    where
+        F: FnOnce() + Send + 'static
+    {
+        let job = Box::new(f);
+        (*self).sender.as_ref().unwrap().send(job).unwrap();
+    }
+}
+
+impl Drop for ThreadPool {
+    fn drop(&mut self) {
+        drop((*self).sender.take());
+
+        for worker in &mut (*self).workers {
+            println!("Shutting down worker {}.", worker.id);
+            if let Some(thread) = worker.thread.take() {
+                thread.join().unwrap();
+            }
+        }
+    }
+}
--- a/src/main.rs
+++ b/src/main.rs
@ -0,0 +1,62 @@
+use std::{
+    net::{TcpListener, TcpStream},
+    io::{prelude::*, BufReader},
+    fs,
+    thread,
+    time::Duration,
+};
+
+use rust_webserver::ThreadPool;
+
+fn parse_request(stream: &TcpStream) -> Vec<String>{
+    let buf_reader = BufReader::new(stream);
+
+    buf_reader
+        .lines()
+        .map(|result| result.unwrap())
+        .take_while(|line| !line.is_empty())
+        .collect()
+}
+
+fn generate_reposne(request: &Vec<String>) -> String {
+    let request_header = (*(request.first().unwrap())).clone();
+
+    let (status, file) = 
+        match &request_header[..] {
+            "GET / HTTP/1.1" => ("HTTP/1.1 200 OK", "html/index.html"),
+            "GET /sleep HTTP/1.1" => {
+                thread::sleep(Duration::from_secs(5));
+                ("HTTP/1.1 200 OK", "html/slow.html")
+            },
+            _ => ("HTTP/1.1 404 NOT FOUND", "html/404.html")
+        };
+
+    let contents = fs::read_to_string(file).unwrap();
+    let len = contents.len();
+    format!("{status}\r\nContent-Length: {len}\r\n\r\n{contents}")
+}
+
+fn handle_connection(mut stream: TcpStream) {
+    let request = parse_request(&stream);
+    let response = generate_reposne(&request);
+
+    stream.write_all(response.as_bytes()).unwrap();
+}
+
+fn main() {
+    let port = 7878;
+    let connections = 3;
+    let listener = TcpListener::bind(format!("127.0.0.1:{}", port)).unwrap();
+
+    let pool = ThreadPool::new(10).unwrap();
+
+    println!("Listening for {} connnections on port {}", connections, port);
+    for stream in listener.incoming().take(connections) {
+        let stream = stream.unwrap();
+        
+        pool.execute(|| {
+            handle_connection(stream);
+        });
+
+    }
+}