From 7e8ee5ed9cad6484e9f13f81731b102ced58402e Mon Sep 17 00:00:00 2001
From: Adam Carpenter <gitlab@53hor.net>
Date: Tue, 9 Jul 2019 15:14:04 -0400
Subject: Init.

---
 rust-book/hello_server/src/bin/main.rs |  46 +++++++++++++
 rust-book/hello_server/src/lib.rs      | 117 +++++++++++++++++++++++++++++++++
 2 files changed, 163 insertions(+)
 create mode 100755 rust-book/hello_server/src/bin/main.rs
 create mode 100755 rust-book/hello_server/src/lib.rs

(limited to 'rust-book/hello_server/src')

diff --git a/rust-book/hello_server/src/bin/main.rs b/rust-book/hello_server/src/bin/main.rs
new file mode 100755
index 0000000..bcf1e46
--- /dev/null
+++ b/rust-book/hello_server/src/bin/main.rs
@@ -0,0 +1,46 @@
+use hello_server::ThreadPool;
+use std::thread;
+use std::time::Duration;
+use std::io::prelude::*;
+use std::fs;
+use std::net::TcpStream;
+use std::net::TcpListener;
+
+fn main() {
+    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+    let pool = ThreadPool::new(4).unwrap();
+
+    for stream in listener.incoming().take(2) {
+        let stream = stream.unwrap();
+
+        pool.execute(|| {
+            handle_connection(stream);
+        });
+    }
+
+    println!("shutting down...");
+
+}
+
+fn handle_connection(mut stream: TcpStream) {
+    let mut buffer = [0; 512];
+    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\r\n\r\n", "hello.html")
+    }
+    else if buffer.starts_with(sleep) {
+        thread::sleep(Duration::from_secs(5));
+        ("HTTP/1.1 200 OK\r\n\r\n", "hello.html")
+    }
+    else {
+        ("HTTP/1.1 404 NOT FOUND\r\n\r\n", "404.html")
+    };
+
+    let contents = fs::read_to_string(filename).unwrap();
+    let response = format!("{}{}", status_line, contents);
+    stream.write(response.as_bytes()).unwrap();
+    stream.flush().unwrap();
+}
diff --git a/rust-book/hello_server/src/lib.rs b/rust-book/hello_server/src/lib.rs
new file mode 100755
index 0000000..cd1f616
--- /dev/null
+++ b/rust-book/hello_server/src/lib.rs
@@ -0,0 +1,117 @@
+use std::sync::Arc;
+use std::sync::Mutex;
+use std::sync::mpsc;
+use std::thread;
+
+enum Message {
+    NewJob(Job),
+    Terminate,
+}
+
+trait FnBox {
+    fn call_box(self: Box<Self>);
+}
+
+impl <F: FnOnce()> FnBox for F {
+    fn call_box(self: Box<F>) {
+        (*self)()
+    }
+}
+
+type Job = Box<FnBox + Send + 'static>;
+
+pub struct ThreadPool {
+    workers: Vec<Worker>,
+    sender: mpsc::Sender<Message>,
+}
+
+impl ThreadPool {
+    pub fn new(size: usize) -> Result<ThreadPool, &'static str> {
+        if size <= 0 {
+            return Err("failed to create pool");
+        }
+
+        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))?);
+        }
+
+        Ok(ThreadPool {
+            workers,
+            sender,
+        })
+    }
+
+    pub fn spawn<F, T>(f: F) -> thread::JoinHandle<T>
+        where
+            F: FnOnce() -> T + Send + 'static,
+            T: Send + 'static
+    {
+        thread::spawn(f)
+    }
+
+    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) {
+        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 {
+    pub fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>)
+        -> Result<Worker, &'static str>
+    {
+        let thread = thread::spawn(move || { 
+            loop {
+                let message = receiver.lock().unwrap().recv().unwrap();
+
+                match message {
+                    Message::NewJob(job) => {
+                        println!("worker {} got job, executing...", id);
+                        job.call_box();
+                    },
+                    Message::Terminate => {
+                        println!("worker {} was told to terminate...", id);
+                        break;
+                    },
+                }
+            }
+        });
+
+        Ok(Worker {
+            id,
+            thread: Some(thread),
+        })
+    }
+}
-- 
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