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# 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.
import inspect
import logging
import logging.config
import logging.handlers
import os
try:
from systemd import journal
except ImportError:
journal = None
try:
import syslog
except ImportError:
syslog = None
NullHandler = logging.NullHandler
def _get_binary_name():
return os.path.basename(inspect.stack()[-1][1])
_AUDIT = logging.INFO + 1
_TRACE = 5
# This is a copy of the numerical constants from syslog.h. The
# definition of these goes back at least 20 years, and is specifically
# 3 bits in a packed field, so these aren't likely to ever need
# changing.
SYSLOG_MAP = {
"CRITICAL": 2,
"ERROR": 3,
"WARNING": 4,
"WARN": 4,
"INFO": 6,
"DEBUG": 7,
}
class OSSysLogHandler(logging.Handler):
"""Syslog based handler. Only available on UNIX-like platforms."""
def __init__(self, facility=None):
# Default values always get evaluated, for which reason we avoid
# using 'syslog' directly, which may not be available.
facility = facility if facility is not None else syslog.LOG_USER
# Do not use super() unless type(logging.Handler) is 'type'
# (i.e. >= Python 2.7).
if not syslog:
raise RuntimeError("Syslog not available on this platform")
logging.Handler.__init__(self)
binary_name = _get_binary_name()
syslog.openlog(binary_name, 0, facility)
def emit(self, record):
priority = SYSLOG_MAP.get(record.levelname, 7)
message = self.format(record)
syslog.syslog(priority, message)
class OSJournalHandler(logging.Handler):
custom_fields = (
'project_name',
'project_id',
'user_name',
'user_id',
'request_id',
)
def __init__(self, facility=None):
if not journal:
raise RuntimeError("Systemd bindings do not exist")
if not facility:
if not syslog:
raise RuntimeError("syslog is not available on this platform")
facility = syslog.LOG_USER
# Do not use super() unless type(logging.Handler) is 'type'
# (i.e. >= Python 2.7).
logging.Handler.__init__(self)
self.binary_name = _get_binary_name()
self.facility = facility
def emit(self, record):
priority = SYSLOG_MAP.get(record.levelname, 7)
message = self.format(record)
extras = {
'CODE_FILE': record.pathname,
'CODE_LINE': record.lineno,
'CODE_FUNC': record.funcName,
'THREAD_NAME': record.threadName,
'PROCESS_NAME': record.processName,
'LOGGER_NAME': record.name,
'LOGGER_LEVEL': record.levelname,
'SYSLOG_IDENTIFIER': self.binary_name,
'PRIORITY': priority,
'SYSLOG_FACILITY': self.facility,
}
if record.exc_info:
# Cache the traceback text to avoid converting it multiple times
# (it's constant anyway)
if not record.exc_text:
record.exc_text = self.formatter.formatException(
record.exc_info)
if record.exc_text:
extras['EXCEPTION_INFO'] = record.exc_text
# Leave EXCEPTION_TEXT for backward compatibility
extras['EXCEPTION_TEXT'] = record.exc_text
for field in self.custom_fields:
value = record.__dict__.get(field)
if value:
extras[field.upper()] = value
journal.send(message, **extras)
class ColorHandler(logging.StreamHandler):
"""Log handler that sets the 'color' key based on the level
To use, include a '%(color)s' entry in the logging_context_format_string.
There is also a '%(reset_color)s' key that can be used to manually reset
the color within a log line.
"""
LEVEL_COLORS = {
_TRACE: '\033[00;35m', # MAGENTA
logging.DEBUG: '\033[00;32m', # GREEN
logging.INFO: '\033[00;36m', # CYAN
_AUDIT: '\033[01;36m', # BOLD CYAN
logging.WARN: '\033[01;33m', # BOLD YELLOW
logging.ERROR: '\033[01;31m', # BOLD RED
logging.CRITICAL: '\033[01;31m', # BOLD RED
}
def format(self, record):
record.color = self.LEVEL_COLORS[record.levelno]
record.reset_color = '\033[00m'
return logging.StreamHandler.format(self, record) + record.reset_color
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