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Unified Diff: tools/drmemory/scripts/logging_utils.py

Issue 1452293002: Add Dr. Memory tool (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: remove more unused code Created 5 years, 1 month ago
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Index: tools/drmemory/scripts/logging_utils.py
diff --git a/tools/drmemory/scripts/logging_utils.py b/tools/drmemory/scripts/logging_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..ef2d674950fd7d34e8679e3f1a2c02156a18f7a4
--- /dev/null
+++ b/tools/drmemory/scripts/logging_utils.py
@@ -0,0 +1,82 @@
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+''' Utility functions and objects for logging.
+'''
+
+import logging
+import sys
+
+class StdoutStderrHandler(logging.Handler):
+ ''' Subclass of logging.Handler which outputs to either stdout or stderr
+ based on a threshold level.
+ '''
+
+ def __init__(self, threshold=logging.WARNING, err=sys.stderr, out=sys.stdout):
+ ''' Args:
+ threshold: below this logging level messages are sent to stdout,
+ otherwise they are sent to stderr
+ err: a stream object that error messages are sent to, defaults to
+ sys.stderr
+ out: a stream object that non-error messages are sent to, defaults to
+ sys.stdout
+ '''
+ logging.Handler.__init__(self)
+ self._err = logging.StreamHandler(err)
+ self._out = logging.StreamHandler(out)
+ self._threshold = threshold
+ self._last_was_err = False
+
+ def setLevel(self, lvl):
+ logging.Handler.setLevel(self, lvl)
+ self._err.setLevel(lvl)
+ self._out.setLevel(lvl)
+
+ def setFormatter(self, formatter):
+ logging.Handler.setFormatter(self, formatter)
+ self._err.setFormatter(formatter)
+ self._out.setFormatter(formatter)
+
+ def emit(self, record):
+ if record.levelno < self._threshold:
+ self._out.emit(record)
+ self._last_was_err = False
+ else:
+ self._err.emit(record)
+ self._last_was_err = False
+
+ def flush(self):
+ # preserve order on the flushing, the stalest stream gets flushed first
+ if self._last_was_err:
+ self._out.flush()
+ self._err.flush()
+ else:
+ self._err.flush()
+ self._out.flush()
+
+
+FORMAT = "%(asctime)s %(filename)s [%(levelname)s] %(message)s"
+DATEFMT = "%H:%M:%S"
+
+def config_root(level=logging.INFO, threshold=logging.WARNING, format=FORMAT,
+ datefmt=DATEFMT):
+ ''' Configure the root logger to use a StdoutStderrHandler and some default
+ formatting.
+ Args:
+ level: messages below this level are ignored
+ threshold: below this logging level messages are sent to stdout,
+ otherwise they are sent to stderr
+ format: format for log messages, see logger.Format
+ datefmt: format for date in log messages
+
+ '''
+ # to set the handler of the root logging object, we need to do setup
+ # manually rather than using basicConfig
+ root = logging.getLogger()
+ root.setLevel(level)
+ formatter = logging.Formatter(format, datefmt)
+ handler = StdoutStderrHandler(threshold=threshold)
+ handler.setLevel(level)
+ handler.setFormatter(formatter)
+ root.addHandler(handler)
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