author | Sverre Rabbelier <srabbelier@gmail.com> |
Wed, 08 Apr 2009 22:19:05 +0000 | |
changeset 2127 | 1a0167169af3 |
parent 109 | 620f9b141567 |
child 2864 | 2e0b0af889be |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""Logging utilities for use by applications. |
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Classes defined here: |
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AppLogsHandler: StreamHandler subclass |
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""" |
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import logging |
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import sys |
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import types |
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NEWLINE_REPLACEMENT = "\0" |
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class AppLogsHandler(logging.StreamHandler): |
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"""Logging handler that will direct output to a persistent store of |
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application logs. |
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This handler will output log statements to stderr. This handler is |
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automatically initialized and attached to the Python common logging library. |
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""" |
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def __init__(self, stream=None): |
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"""Constructor. |
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Args: |
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# stream is optional. it defaults to sys.stderr. |
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stream: destination for output |
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""" |
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logging.StreamHandler.__init__(self, stream) |
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def close(self): |
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"""Closes the stream. |
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This implementation based on the implementation of FileHandler.close().""" |
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self.flush() |
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self.stream.close() |
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logging.StreamHandler.close(self) |
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def emit(self, record): |
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"""Emit a record. |
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This implementation is based on the implementation of |
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StreamHandler.emit().""" |
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try: |
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message = self._AppLogsMessage(record) |
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self.stream.write(message.encode("UTF-8")) |
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self.flush() |
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except (KeyboardInterrupt, SystemExit): |
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raise |
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except: |
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self.handleError(record) |
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def _AppLogsMessage(self, record): |
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"""Converts the log record into a log line.""" |
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message = self.format(record).replace("\n", NEWLINE_REPLACEMENT) |
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return "LOG %d %d %s\n" % (self._AppLogsLevel(record.levelno), |
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long(record.created * 1000 * 1000), |
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message) |
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|
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def _AppLogsLevel(self, level): |
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"""Converts the logging level used in Python to the API logging level""" |
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if level >= logging.CRITICAL: |
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return 4 |
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elif level >= logging.ERROR: |
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return 3 |
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elif level >= logging.WARNING: |
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return 2 |
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elif level >= logging.INFO: |
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return 1 |
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else: |
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return 0 |