Implement Serve feature

Author: Bobo1239

Cargo.toml

@@ -25,18 +25,24 @@ notify = { version = "2.5.4", optional = true }
 time = { version = "0.1.34", optional = true }
 crossbeam = { version = "0.2.8", optional = true }
 
+# Serve feature
+iron = { version = "0.3", optional = true }
+staticfile = { version = "0.2", optional = true }
+websocket = { version = "0.16.1", optional = true}
+
 
 # Tests
 [dev-dependencies]
 tempdir = "0.3.4"
 
 
 [features]
-default = ["output", "watch"]
+default = ["output", "watch", "serve"]
 debug = []
 output = []
 regenerate-css = []
 watch = ["notify", "time", "crossbeam"]
+serve = ["iron", "staticfile", "websocket"]
 
 [[bin]]
 doc = false

src/bin/livereload.rs

@@ -0,0 +1,210 @@
+extern crate websocket;
+extern crate crossbeam;
+
+use std::sync::mpsc::channel;
+use std::sync::mpsc;
+use std::io;
+use std::thread;
+use std::sync::{Arc, Mutex};
+use std::ops::Deref;
+use std::marker::PhantomData;
+
+use self::websocket::header::WebSocketProtocol;
+use self::websocket::ws::sender::Sender;
+use self::websocket::ws::receiver::Receiver;
+use self::websocket::message::Type;
+use self::websocket::{Server, Message};
+
+const WS_PROTOCOL: &'static str = "livereload";
+const RELOAD_COMMAND: &'static str = "reload";
+
+
+#[derive(Debug, Clone, PartialEq)]
+enum MessageType {
+    Reload,
+    Close,
+}
+
+
+#[derive(Clone)]
+struct ComparableSender<T> {
+    sender: mpsc::Sender<T>,
+    id: usize,
+}
+
+impl<T> PartialEq for ComparableSender<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.id == other.id
+    }
+}
+
+impl<T> Deref for ComparableSender<T> {
+    type Target = mpsc::Sender<T>;
+
+    fn deref(&self) -> &mpsc::Sender<T> {
+        &self.sender
+    }
+}
+
+
+struct ComparableSenderFactory<T> {
+    next_id: usize,
+    sender_type: PhantomData<T>,
+}
+
+impl<T> ComparableSenderFactory<T> {
+    fn generate(&mut self, sender: mpsc::Sender<T>) -> ComparableSender<T> {
+        let tx = ComparableSender {
+            sender: sender,
+            id: self.next_id,
+        };
+        self.next_id += 1;
+        tx
+    }
+
+    fn new() -> ComparableSenderFactory<T> {
+        ComparableSenderFactory {
+            next_id: 0,
+            sender_type: PhantomData,
+        }
+    }
+}
+
+
+pub struct LiveReload {
+    senders: Arc<Mutex<Vec<ComparableSender<MessageType>>>>,
+}
+
+impl LiveReload {
+    pub fn new(address: &str) -> io::Result<LiveReload> {
+        let server = try!(Server::bind(address));
+
+        let senders: Arc<Mutex<Vec<ComparableSender<MessageType>>>> = Arc::new(Mutex::new(vec![]));
+        let senders_clone = senders.clone();
+
+        let mut factory = ComparableSenderFactory::new();
+
+        let lr = LiveReload { senders: senders_clone };
+
+        // handle connection attempts on a separate thread
+        thread::spawn(move || {
+            for connection in server {
+                let mut senders = senders.clone();
+                let (tx, rx) = channel();
+
+                let tx = factory.generate(tx);
+
+                senders.lock().unwrap().push(tx.clone());
+
+                // each connection gets a separate thread
+                thread::spawn(move || {
+                    let request = connection.unwrap().read_request().unwrap();
+                    let headers = request.headers.clone();
+
+                    let mut valid = false;
+                    if let Some(&WebSocketProtocol(ref protocols)) = headers.get() {
+                        if protocols.contains(&(WS_PROTOCOL.to_owned())) {
+                            valid = true;
+                        }
+                    }
+
+                    let client;
+                    if valid {
+                        let mut response = request.accept();
+                        response.headers.set(WebSocketProtocol(vec![WS_PROTOCOL.to_owned()]));
+                        client = response.send().unwrap();
+                    } else {
+                        request.fail().send().unwrap();
+                        println!("{:?}", "Rejecting invalid websocket request.");
+                        return;
+                    }
+
+                    let (mut ws_tx, mut ws_rx) = client.split();
+
+                    // handle receiving and sending (websocket) in two separate threads
+                    crossbeam::scope(|scope| {
+                        let tx_clone = tx.clone();
+                        scope.spawn(move || {
+                            let tx = tx_clone;
+                            loop {
+                                match rx.recv() {
+                                    Ok(msg) => {
+                                        match msg {
+                                            MessageType::Reload => {
+                                                let message: Message = Message::text(RELOAD_COMMAND.to_owned());
+                                                let mut senders = senders.clone();
+                                                if ws_tx.send_message(&message).is_err() {
+                                                    // the receiver isn't available anymore
+                                                    // remove the tx from senders and exit
+                                                    LiveReload::remove_sender(&mut senders, &tx);
+                                                    break;
+                                                }
+                                            },
+                                            MessageType::Close => {
+                                                LiveReload::remove_sender(&mut senders, &tx);
+                                                break;
+                                            },
+                                        }
+                                    },
+                                    Err(e) => {
+                                        println!("{:?}", e);
+                                        break;
+                                    },
+                                }
+                            }
+                        });
+
+                        for message in ws_rx.incoming_messages() {
+                            match message {
+                                Ok(message) => {
+                                    let message: Message = message;
+                                    match message.opcode {
+                                        Type::Close => {
+                                            tx.send(MessageType::Close).unwrap();
+                                            break;
+                                        },
+                                        // TODO ?
+                                        // Type::Ping => {
+                                        //     let message = websocket::Message::pong(message.payload);
+                                        //     ws_tx.send_message(&message).unwrap();
+                                        // },
+                                        _ => {
+                                            println!("{:?}", message.opcode);
+                                            unimplemented!()
+                                        },
+                                    }
+                                },
+                                Err(err) => {
+                                    println!("Error: {}", err);
+                                    break;
+                                },
+                            }
+                        }
+                    });
+                });
+            }
+        });
+
+        Ok(lr)
+    }
+
+    fn remove_sender(senders: &mut Arc<Mutex<Vec<ComparableSender<MessageType>>>>, el: &ComparableSender<MessageType>) {
+        let mut senders = senders.lock().unwrap();
+        let mut index = 0;
+        for i in 0..senders.len() {
+            if &senders[i] == el {
+                index = i;
+                break;
+            }
+        }
+        senders.remove(index);
+    }
+
+    pub fn trigger_reload(&self) {
+        let senders = self.senders.lock().unwrap();
+        println!("Reloading {} client(s).", senders.len());
+        for sender in senders.iter() {
+            sender.send(MessageType::Reload).unwrap();
+        }
+    }
+}