webui: Build the Web UI using Tornado with WebSocket

Tornado: http://www.tornadoweb.org/

1 files changed, 27 insertions, 0 deletions

diff --git a/fg21sim/webui/websocket.py b/fg21sim/webui/websocket.py
new file mode 100644
index 0000000..ab846df
--- /dev/null
+++ b/fg21sim/webui/websocket.py
@@ -0,0 +1,27 @@
+# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
+# MIT license
+
+"""
+Communicate with the "fg21sim" simulation program through the Web UI using
+the WebSocket_ technique, which provides full-duplex communication channels
+over a single TCP connection.
+
+.. _WebSocket: https://en.wikipedia.org/wiki/WebSocket ,
+   http://caniuse.com/#feat=websockets
+"""
+
+import tornado.websocket
+
+
+class EchoWSHandler(tornado.websocket.WebSocketHandler):
+    def open(self):
+        print("WebSocket opened")
+
+    def on_message(self, message):
+        print("Message received: %s" % message)
+        msg_back = message[::-1]
+        print("Message sent back: %s" % msg_back)
+        self.write_message(msg_back)
+
+    def on_close(self):
+        print("WebSocket closed")