Added Python 3.5 “async for” compat to websocket

Instead of

while True:
	msg = await ws.receive()
	...
	elif msg.tp == web.MsgType.close:
		break

do:

async for msg in ws:
	...

aiohttp/web_ws.py

@@ -1,3 +1,4 @@
+import sys
 import asyncio
 import warnings
 
@@ -11,6 +12,7 @@
 
 __all__ = ('WebSocketResponse', 'MsgType')
 
+PY_35 = sys.version_info >= (3, 5)
 
 THRESHOLD_CONNLOST_ACCESS = 5
 
@@ -285,3 +287,15 @@ def receive_bytes(self):
 
     def write(self, data):
         raise RuntimeError("Cannot call .write() for websocket")
+
+    if PY_35:
+        @asyncio.coroutine
+        def __aiter__(self):
+            return self
+
+        @asyncio.coroutine
+        def __anext__(self):
+            msg = yield from self.receive()
+            if msg.tp == MsgType.close:
+                raise StopAsyncIteration  # NOQA
+            return msg

docs/web.rst

@@ -396,19 +396,17 @@ using response's methods:
         ws = web.WebSocketResponse()
         await ws.prepare(request)
 
-        while True:
-            msg = await ws.receive()
-
+        async for msg in ws:
             if msg.tp == aiohttp.MsgType.text:
                 if msg.data == 'close':
                     await ws.close()
                 else:
                     ws.send_str(msg.data + '/answer')
-            elif msg.tp == aiohttp.MsgType.close:
-                print('websocket connection closed')
             elif msg.tp == aiohttp.MsgType.error:
                 print('ws connection closed with exception %s',
                       ws.exception())
+        
+        print('websocket connection closed')
 
         return ws
 

tests/test_py35/test_web_websocket.py

@@ -0,0 +1,49 @@
+import pytest
+
+import asyncio
+
+from aiohttp import web, websocket, websocket_client
+
+
+async def create_server(loop, port, method, path, route_handler):
+    app = web.Application(loop=loop)
+    app.router.add_route(method, path, route_handler)
+    handler = app.make_handler(keep_alive_on=False)
+    return await loop.create_server(handler, '127.0.0.1', port)
+
+
+@pytest.mark.run_loop
+async def test_await(loop, unused_port):
+    closed = asyncio.Future(loop=loop)
+
+    async def handler(request):
+        ws = web.WebSocketResponse()
+        await ws.prepare(request)
+        async for msg in ws:
+            assert msg.tp == websocket_client.MsgType.text
+            s = msg.data
+            ws.send_str(s + '/answer')
+        await ws.close()
+        closed.set_result(1)
+        return ws
+
+    port = unused_port()
+    server = await create_server(loop, port, 'GET', '/', handler)
+    resp = await websocket_client.ws_connect('ws://127.0.0.1:{p}'.format(p=port), loop=loop)
+
+    items = ['q1', 'q2', 'q3']
+    for item in items:
+        resp._writer.send(item)
+        msg = await resp._reader.read()
+        assert msg.tp == websocket.MSG_TEXT
+        assert item + '/answer' == msg.data
+
+    msg = await resp._reader.read()
+    assert msg.tp == websocket.MSG_CLOSE
+    assert msg.data == 1000
+    assert msg.extra == ''
+
+    resp._writer.close()
+
+    await closed
+    resp.close()