bpo-34666: Implement stream.awrite() and stream.aclose() (GH-9274)

2 files changed, 31 insertions, 1 deletions

diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
index e7fb22e..0afc66a 100644
--- a/Lib/asyncio/streams.py
+++ b/Lib/asyncio/streams.py
@@ -348,7 +348,7 @@ class StreamWriter:
         # a reader can be garbage collected
         # after connection closing
         self._protocol._untrack_reader()
-        return self._transport.close()
+        self._transport.close()
 
     def is_closing(self):
         return self._transport.is_closing()
@@ -381,6 +381,14 @@ class StreamWriter:
             await sleep(0, loop=self._loop)
         await self._protocol._drain_helper()
 
+    async def aclose(self):
+        self.close()
+        await self.wait_closed()
+
+    async def awrite(self, data):
+        self.write(data)
+        await self.drain()
+
 
 class StreamReader:
 
diff --git a/Lib/test/test_asyncio/test_streams.py b/Lib/test/test_asyncio/test_streams.py
index 67ac9d9..d8e3715 100644
--- a/Lib/test/test_asyncio/test_streams.py
+++ b/Lib/test/test_asyncio/test_streams.py
@@ -964,6 +964,28 @@ os.close(fd)
                          'call "stream.close()" explicitly.',
                          messages[0]['message'])
 
+    def test_async_writer_api(self):
+        messages = []
+        self.loop.set_exception_handler(lambda loop, ctx: messages.append(ctx))
+
+        with test_utils.run_test_server() as httpd:
+            rd, wr = self.loop.run_until_complete(
+                asyncio.open_connection(*httpd.address,
+                                        loop=self.loop))
+
+            f = wr.awrite(b'GET / HTTP/1.0\r\n\r\n')
+            self.loop.run_until_complete(f)
+            f = rd.readline()
+            data = self.loop.run_until_complete(f)
+            self.assertEqual(data, b'HTTP/1.0 200 OK\r\n')
+            f = rd.read()
+            data = self.loop.run_until_complete(f)
+            self.assertTrue(data.endswith(b'\r\n\r\nTest message'))
+            f = wr.aclose()
+            self.loop.run_until_complete(f)
+
+        self.assertEqual(messages, [])
+
 
 if __name__ == '__main__':
     unittest.main()