[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 888bbdc192)

Lib/ssl.py

@@ -959,10 +959,11 @@ class SSLSocket(socket):
                 raise ValueError(
                     "non-zero flags not allowed in calls to sendall() on %s" %
                     self.__class__)
-            amount = len(data)
             count = 0
-            while (count < amount):
+            with memoryview(data) as view, view.cast("B") as byte_view:
-                v = self.send(data[count:])
+                amount = len(byte_view)
+                while count < amount:
+                    v = self.send(byte_view[count:])
                     count += v
         else:
             return socket.sendall(self, data, flags)

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

Misc/NEWS.d/next/Library/2017-09-06-06-50-41.bpo-27340.GgekV5.rst

@@ -0,0 +1,3 @@
+SSLSocket.sendall() now uses memoryview to create slices of data. This fixes
+support for all bytes-like object. It is also more efficient and avoids
+costly copies.