From 90b877a2c785bb7691249d31e23138e0385001ae Mon Sep 17 00:00:00 2001
From: Aaron LI <aaronly.me@outlook.com>
Date: Sun, 30 Oct 2016 16:07:10 +0800
Subject: webui: Build the Web UI using Tornado with WebSocket

Tornado: http://www.tornadoweb.org/
---
 fg21sim/webui/__init__.py  |  4 ++++
 fg21sim/webui/app.py       | 37 +++++++++++++++++++++++++++++++++++++
 fg21sim/webui/websocket.py | 27 +++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 fg21sim/webui/__init__.py
 create mode 100644 fg21sim/webui/app.py
 create mode 100644 fg21sim/webui/websocket.py

(limited to 'fg21sim/webui')

diff --git a/fg21sim/webui/__init__.py b/fg21sim/webui/__init__.py
new file mode 100644
index 0000000..637e653
--- /dev/null
+++ b/fg21sim/webui/__init__.py
@@ -0,0 +1,4 @@
+# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
+# MIT license
+
+from .app import make_application
diff --git a/fg21sim/webui/app.py b/fg21sim/webui/app.py
new file mode 100644
index 0000000..63d80be
--- /dev/null
+++ b/fg21sim/webui/app.py
@@ -0,0 +1,37 @@
+# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
+# MIT license
+
+"""
+Web user interface (UI) of "fg21sim" based upon Tornado_.
+
+.. _Tornado: http://www.tornadoweb.org/
+"""
+
+import os
+
+import tornado.web
+
+from .websocket import EchoWSHandler
+
+
+class IndexHandler(tornado.web.RequestHandler):
+    def get(self):
+        self.render("index.html")
+
+
+_settings = {
+    # The static files will be served from the default "/static/" URI
+    "static_path": os.path.join(os.path.dirname(__file__), "static"),
+    "template_path": os.path.join(os.path.dirname(__file__), "templates"),
+}
+
+
+def make_application(**kwargs):
+    settings = _settings
+    settings.update(kwargs)
+    appplication = tornado.web.Application(
+        handlers=[
+            (r"/", IndexHandler),
+            (r"/ws", EchoWSHandler),
+        ], **settings)
+    return appplication
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")
-- 
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