BaseTools: Add the support for python 2

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1875

python3 change the module name of Queue to queue.
python3 add a new log handler of QueueHandler.

This patch is to make Multiple process AutoGen
feature work for python2

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/AutoGen/AutoGenWorker.py

@@ -16,7 +16,10 @@ import os
 from Common.MultipleWorkspace import MultipleWorkspace as mws
 from AutoGen.AutoGen import AutoGen
 from Workspace.WorkspaceDatabase import BuildDB
-from queue import Empty
+try:
+    from queue import Empty
+except:
+    from Queue import Empty
 import traceback
 import sys
 from AutoGen.DataPipe import MemoryDataPipe

BaseTools/Source/Python/Common/EdkLogger.py

@@ -5,12 +5,96 @@
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 
+# Copyright 2001-2016 by Vinay Sajip. All Rights Reserved.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose and without fee is hereby granted,
+# provided that the above copyright notice appear in all copies and that
+# both that copyright notice and this permission notice appear in
+# supporting documentation, and that the name of Vinay Sajip
+# not be used in advertising or publicity pertaining to distribution
+# of the software without specific, written prior permission.
+# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+# This copyright is for QueueHandler.
+
 ## Import modules
 from __future__ import absolute_import
 import Common.LongFilePathOs as os, sys, logging
 import traceback
 from  .BuildToolError import *
-import logging.handlers
+try:
+    from logging.handlers import QueueHandler
+except:
+    class QueueHandler(logging.Handler):
+        """
+        This handler sends events to a queue. Typically, it would be used together
+        with a multiprocessing Queue to centralise logging to file in one process
+        (in a multi-process application), so as to avoid file write contention
+        between processes.
+
+        This code is new in Python 3.2, but this class can be copy pasted into
+        user code for use with earlier Python versions.
+        """
+
+        def __init__(self, queue):
+            """
+            Initialise an instance, using the passed queue.
+            """
+            logging.Handler.__init__(self)
+            self.queue = queue
+
+        def enqueue(self, record):
+            """
+            Enqueue a record.
+
+            The base implementation uses put_nowait. You may want to override
+            this method if you want to use blocking, timeouts or custom queue
+            implementations.
+            """
+            self.queue.put_nowait(record)
+
+        def prepare(self, record):
+            """
+            Prepares a record for queuing. The object returned by this method is
+            enqueued.
+
+            The base implementation formats the record to merge the message
+            and arguments, and removes unpickleable items from the record
+            in-place.
+
+            You might want to override this method if you want to convert
+            the record to a dict or JSON string, or send a modified copy
+            of the record while leaving the original intact.
+            """
+            # The format operation gets traceback text into record.exc_text
+            # (if there's exception data), and also returns the formatted
+            # message. We can then use this to replace the original
+            # msg + args, as these might be unpickleable. We also zap the
+            # exc_info and exc_text attributes, as they are no longer
+            # needed and, if not None, will typically not be pickleable.
+            msg = self.format(record)
+            record.message = msg
+            record.msg = msg
+            record.args = None
+            record.exc_info = None
+            record.exc_text = None
+            return record
+
+        def emit(self, record):
+            """
+            Emit a record.
+
+            Writes the LogRecord to the queue, preparing it for pickling first.
+            """
+            try:
+                self.enqueue(self.prepare(record))
+            except Exception:
+                self.handleError(record)
 
 ## Log level constants
 DEBUG_0 = 1
@@ -208,19 +292,19 @@ def LogClientInitialize(log_q):
     #
     # For DEBUG level (All DEBUG_0~9 are applicable)
     _DebugLogger.setLevel(INFO)
-    _DebugChannel = logging.handlers.QueueHandler(log_q)
+    _DebugChannel = QueueHandler(log_q)
     _DebugChannel.setFormatter(_DebugFormatter)
     _DebugLogger.addHandler(_DebugChannel)
 
     # For VERBOSE, INFO, WARN level
     _InfoLogger.setLevel(INFO)
-    _InfoChannel = logging.handlers.QueueHandler(log_q)
+    _InfoChannel = QueueHandler(log_q)
     _InfoChannel.setFormatter(_InfoFormatter)
     _InfoLogger.addHandler(_InfoChannel)
 
     # For ERROR level
     _ErrorLogger.setLevel(INFO)
-    _ErrorCh = logging.handlers.QueueHandler(log_q)
+    _ErrorCh = QueueHandler(log_q)
     _ErrorCh.setFormatter(_ErrorFormatter)
     _ErrorLogger.addHandler(_ErrorCh)