Implement a WebSocket server for debugging.

components/debugger/lib.rs

@@ -0,0 +1,50 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate util;
+extern crate websocket;
+
+use util::thread::spawn_named;
+use websocket::{Message, Receiver, Sender, Server};
+use websocket::message::Type;
+
+pub fn start_server(port: u16) {
+    println!("Starting debugger server.");
+    spawn_named("debugger-server".to_owned(), move || {
+        run_server(port)
+    });
+}
+
+fn run_server(port: u16) {
+    let server = Server::bind(("127.0.0.1", port)).unwrap();
+    for connection in server {
+        spawn_named("debugger-connection".to_owned(), move || {
+            let connection = connection.unwrap();
+            let request = connection.read_request().unwrap();
+            let response = request.accept();
+            let client = response.send().unwrap();
+            let (mut sender, mut receiver) = client.split();
+            for message in receiver.incoming_messages() {
+                let message: Message = message.unwrap();
+                match message.opcode {
+                    Type::Close => {
+                        let message = Message::close();
+                        sender.send_message(&message).unwrap();
+                        break;
+                    }
+                    Type::Ping => {
+                        let message = Message::pong(message.payload);
+                        sender.send_message(&message).unwrap();
+                    }
+                    Type::Text => {
+                        sender.send_message(&message).unwrap();
+                    }
+                    _ => {
+                        panic!("Unexpected message type.");
+                    }
+                }
+            }
+        });
+    }
+}