add rudimentary web interface

src/chesspp/web.py

@@ -0,0 +1,79 @@
+import os
+import asyncio
+import aiohttp
+from aiohttp import web
+
+import chess
+from chesspp import engine
+
+_DIR = os.path.abspath(os.path.dirname(__file__))
+_INDEX = os.path.join(_DIR, "res/index.html")
+
+def load_index():
+    with open(_INDEX, 'r') as fp:
+        return fp.read()
+
+
+index_data = load_index()
+
+async def handle_index(request):
+    #raise web.HTTPFound('/index.html')
+    return web.Response(text=load_index(), content_type='text/html')
+
+class Simulate:
+    def __init__(self):
+        self.white = engine.ClassicMctsEngine(chess.WHITE)
+        self.black = engine.ClassicMctsEngine(chess.BLACK)
+
+    def run(self):
+        board = chess.Board()
+
+        is_white_playing = True
+        while not board.is_game_over():
+            play_result = self.white.play(board) if is_white_playing else self.black.play(board)
+            yield play_result.move
+            board.push(play_result.move)
+            is_white_playing = not is_white_playing
+
+
+async def websocket_handler(request):
+    ws = web.WebSocketResponse()
+    await ws.prepare(request)
+
+    async def wait_msg():
+        async for msg in ws:
+            if msg.type == aiohttp.WSMsgType.TEXT:
+                if msg.data == 'close':
+                    await ws.close()
+            elif msg.type == aiohttp.WSMsgType.ERROR:
+                print(f'ws connection closed with exception {ws.exception()}')
+    
+    async def turns():
+        runner = Simulate().run()
+        def sim():
+            return next(runner, None) 
+
+        turn = await asyncio.to_thread(sim)
+        while turn is not None:
+            await ws.send_str(turn.uci())
+            turn = await asyncio.to_thread(sim)
+    
+    async with asyncio.TaskGroup() as tg:
+        tg.create_task(wait_msg())
+        tg.create_task(turns())
+
+    print('websocket connection closed')
+
+    return ws
+
+
+app = web.Application()
+app.add_routes([
+    web.get('/', handle_index),
+    #web.static('/', os.path.join(_DIR, 'res')),
+    web.static('/img/chesspieces/wikipedia/', os.path.join(_DIR, 'res')),
+    web.get('/ws', websocket_handler),
+])
+
+if __name__ == '__main__':
+    web.run_app(app)