Use buffer() in Python2 and use memoryview in Python3

src/class_singleWorker.py

@@ -30,6 +30,7 @@
 from helper_sql import sqlExecute, sqlQuery
 from network import knownnodes, StoppableThread
 from six.moves import configparser, queue
+import six
 
 
 def sizeof_fmt(num, suffix='h/s'):
@@ -515,9 +516,15 @@
             payload, TTL, log_prefix='(For onionpeer object)')
 
         inventoryHash = highlevelcrypto.calculateInventoryHash(payload)
+        if six.PY2:
+            payload_buffer = buffer(payload)
+            tag_buffer = buffer(tag)
+        else:  # assume six.PY3
+            payload_buffer = memoryview(payload)
+            tag_buffer = memoryview(tag)
         state.Inventory[inventoryHash] = (
-            objectType, streamNumber, buffer(payload),  # noqa: F821
-            embeddedTime, buffer(tag)  # noqa: F821
+            objectType, streamNumber, payload_buffer,  # noqa: F821
+            embeddedTime, tag_buffer  # noqa: F821
         )
         self.logger.info(
             'sending inv (within sendOnionPeerObj function) for object: %s',

src/network/bmproto.py

@@ -9,6 +9,7 @@
 import socket
 import struct
 import time
+import six
 
 # magic imports!
 import addresses
@@ -409,8 +410,12 @@
 
         try:
             self.object.checkObjectByType()
+            if six.PY2:
+                data_buffer = buffer(self.object.data)
+            else:  # assume six.PY3
+                data_buffer = memoryview(self.object.data)
             objectProcessorQueue.put((
-                self.object.objectType, buffer(self.object.data)))  # noqa: F821
+                self.object.objectType, data_buffer))  # noqa: F821
         except BMObjectInvalidError:
             BMProto.stopDownloadingObject(self.object.inventoryHash, True)
         else:
@@ -424,10 +429,16 @@
             state.Dandelion.removeHash(
                 self.object.inventoryHash, "cycle detection")
 
+        if six.PY2:
+            object_buffer = buffer(self.payload[objectOffset:])
+            tag_buffer = buffer(self.object.tag)
+        else:  # assume six.PY3
+            object_buffer = memoryview(self.payload[objectOffset:])
+            tag_buffer = memoryview(self.object.tag)
         state.Inventory[self.object.inventoryHash] = (
             self.object.objectType, self.object.streamNumber,
-            buffer(self.payload[objectOffset:]), self.object.expiresTime,  # noqa: F821
-            buffer(self.object.tag)  # noqa: F821
+            object_buffer, self.object.expiresTime,  # noqa: F821
+            tag_buffer  # noqa: F821
         )
         self.handleReceivedObject(
             self.object.streamNumber, self.object.inventoryHash)