[3.6] bpo-27340: Use memoryview in SSLSocket.sendall() (GH-3384) (#3434)

* bpo-27340: Use memoryview in SSLSocket.sendall()

SSLSocket.sendall() now uses memoryview to create slices of data. This fix
support for all bytes-like object. It is also more efficient and avoids
costly copies.

Signed-off-by: Christian Heimes <christian@python.org>

* Cast view to bytes, fix typo

Signed-off-by: Christian Heimes <christian@python.org>.
(cherry picked from commit 888bbdc192ec4db888a294ef758cf5510442dc9a)

1 files changed, 11 insertions, 1 deletions

diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 4191d90..157e6ce 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -18,6 +18,10 @@ import asyncore
 import weakref
 import platform
 import functools
+try:
+    import ctypes
+except ImportError:
+    ctypes = None
 
 ssl = support.import_module("ssl")
 
@@ -2882,7 +2886,13 @@ if _have_threads:
                 s.send(data)
                 buffer = bytearray(len(data))
                 self.assertEqual(s.read(-1, buffer), len(data))
-                self.assertEqual(buffer, data)
+                self.assertEqual(buffer, data)  # sendall accepts bytes-like objects
+
+                if ctypes is not None:
+                    ubyte = ctypes.c_ubyte * len(data)
+                    byteslike = ubyte.from_buffer_copy(data)
+                    s.sendall(byteslike)
+                    self.assertEqual(s.read(), data)
 
                 # Make sure sendmsg et al are disallowed to avoid
                 # inadvertent disclosure of data and/or corruption