Source code for google.appengine.api.app_logging

#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#


"""Logging utilities for use by applications.

Classes defined here:
  AppLogsHandler: StreamHandler subclass
"""







import logging

from google.appengine import runtime
from google.appengine.api import logservice
from google.appengine.runtime import features




NEWLINE_REPLACEMENT = "\0"


[docs]class AppLogsHandler(logging.Handler): """Logging handler that will direct output to a persistent store of application logs. This handler will output log statements to logservice.write(). This handler is automatically initialized and attached to the Python common logging library. """
[docs] def emit(self, record): """Emit a record. This implementation is based on the implementation of StreamHandler.emit(). Args: record: A Python logging.LogRecord object. """ try: if features.IsEnabled("LogServiceWriteRecord"): logservice.write_record(self._AppLogsLevel(record.levelno), record.created, self.format(record), self._AppLogsLocation(record)) else: message = self._AppLogsMessage(record) if isinstance(message, unicode): message = message.encode("UTF-8") logservice.write(message) except (KeyboardInterrupt, SystemExit, runtime.DeadlineExceededError): raise except: self.handleError(record)
def _AppLogsMessage(self, record): """Converts the log record into a log line.""" message = self.format(record).replace("\r\n", NEWLINE_REPLACEMENT) message = message.replace("\r", NEWLINE_REPLACEMENT) message = message.replace("\n", NEWLINE_REPLACEMENT) return "LOG %d %d %s\n" % (self._AppLogsLevel(record.levelno), long(record.created * 1000 * 1000), message) def _AppLogsLevel(self, level): """Converts the logging level used in Python to the API logging level.""" if level >= logging.CRITICAL: return 4 elif level >= logging.ERROR: return 3 elif level >= logging.WARNING: return 2 elif level >= logging.INFO: return 1 else: return 0 def _AppLogsLocation(self, record): """Find the source location responsible for calling the logging API.""" return (getattr(record, "pathname", None), getattr(record, "lineno", None), getattr(record, "funcName", None))

Monitor your resources on the go

Get the Google Cloud Console app to help you manage your projects.

Send feedback about...

Python on App Engine