Reland r276815: Add tests for session cache and false start behavior.

third_party/tlslite/tlslite/tlsrecordlayer.py

 # Authors: 
 #   Trevor Perrin
 #   Google (adapted by Sam Rushing) - NPN support
 #   Martin von Loewis - python 3 port
 #
 # See the LICENSE file for legal information regarding use of this file.
 
 """Helper class for TLSConnection."""
 from __future__ import generators
 
@@ skipping 268 matching lines @@
                 block = bytearray(s[startIndex : endIndex])
                 applicationData = ApplicationData().create(block)
                 for result in self._sendMsg(applicationData, \
                                             randomizeFirstBlock):
                     yield result
                 randomizeFirstBlock = False #only on 1st message
                 index += 1
         except GeneratorExit:
             raise
         except Exception:
-            self._shutdown(False)
+            # Don't invalidate the session on write failure if abrupt closes are
+            # okay.
+            self._shutdown(self.ignoreAbruptClose)
             raise
 
     def close(self):
         """Close the TLS connection.
 
         This function will block until it has exchanged close_notify
         alerts with the other party.  After doing so, it will shut down the
         TLS connection.  Further attempts to read through this connection
         will return "".  Further attempts to write through this connection
         will raise ValueError.
@@ skipping 842 matching lines @@
         imac_md5.update(compatHMAC(label + masterSecret + bytearray([0x36]*48)))
         imac_sha.update(compatHMAC(label + masterSecret + bytearray([0x36]*40)))
 
         md5Bytes = MD5(masterSecret + bytearray([0x5c]*48) + \
                          bytearray(imac_md5.digest()))
         shaBytes = SHA1(masterSecret + bytearray([0x5c]*40) + \
                          bytearray(imac_sha.digest()))
 
         return md5Bytes + shaBytes