Add prop

CHANGES.txt

@@ -1,6 +1,12 @@
 CHANGES
 =======
 
+0.13.1 (Unreleased)
+--------------------
+
+- Add `aiohttp.web.StreamResponse.started` property #213
+
+
 0.13.0 (12-29-2014)
 -------------------
 

aiohttp/web.py

@@ -409,6 +409,10 @@ def _copy_cookies(self):
             value = cookie.output(header='')[1:]
             self.headers.add('Set-Cookie', value)
 
+    @property
+    def started(self):
+        return self._resp_impl is not None
+
     @property
     def status(self):
         return self._status

docs/web.rst

@@ -474,6 +474,11 @@ StreamResponse
                       parameter. Otherwise pass :class:`str` with
                       arbitrary *status* explanation..
 
+   .. attribute:: started
+
+      Read-only :class:`bool` property, ``True`` if :meth:`start` has
+      been called, ``False`` otherwise.
+
    .. attribute:: status
 
       Read-only property for *HTTP response status code*, :class:`int`.

tests/test_web_response.py

@@ -425,3 +425,12 @@ def test_set_text_with_charset(self):
         self.assertEqual("текст", resp.text)
         self.assertEqual("текст".encode('koi8-r'), resp.body)
         self.assertEqual("koi8-r", resp.charset)
+
+    def test_started_when_not_started(self):
+        resp = StreamResponse()
+        self.assertFalse(resp.started)
+
+    def test_started_when_started(self):
+        resp = StreamResponse()
+        resp.start(self.make_request('GET', '/'))
+        self.assertTrue(resp.started)