Fix the Py3/Py2 long() issue.

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/fork@1683 b32b6428-25c9-4566-ad07-03861ab6144f

lib/xaal/lib/messages.py

@@ -31,6 +31,7 @@ import datetime
 import pysodium
 import base64
 import struct
+import sys
 
 import logging
 logger = logging.getLogger(__name__)
@@ -359,8 +360,18 @@ def build_nonce(data):
     nonce = struct.pack('>QL', data[0], data[1])
     return nonce
 
+
 def build_timestamp():
     """Return array [seconds since epoch, microseconds since last seconds] Time = UTC+0000"""
     epoch = datetime.datetime.utcfromtimestamp(0)
     timestamp = datetime.datetime.utcnow() - epoch
-    return [long(timestamp.total_seconds()), int(timestamp.microseconds)]
+    return _packtimestamp(timestamp.total_seconds(), timestamp.microseconds)
+
+
+# for better performance, I choose to use this trick to fix the change in size for Py3.
+# only test once.
+if sys.version_info.major == 2:
+    _packtimestamp = lambda t1,t2: [long(t1),int(t2)]
+else:
+    _packtimestamp = lambda t1,t2: [int(t1),int(t2)]
+