+# -*- Mode: python; indent-tabs-mode: nil -*- */
+#
+# This file is part of systemd.
+#
+# Copyright 2012 David Strauss
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
import traceback as _traceback
import os as _os
+import logging as _logging
from syslog import (LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR,
LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG)
from ._journal import sendv, stream_fd
def _make_line(field, value):
- if isinstance(value, bytes):
- return field.encode('utf-8') + b'=' + value
- else:
- return field + '=' + value
+ if isinstance(value, bytes):
+ return field.encode('utf-8') + b'=' + value
+ else:
+ return field + '=' + value
def send(MESSAGE, MESSAGE_ID=None,
CODE_FILE=None, CODE_LINE=None, CODE_FUNC=None,
**kwargs):
- r"""Send a message to journald.
+ r"""Send a message to journald.
- >>> journal.send('Hello world')
- >>> journal.send('Hello, again, world', FIELD2='Greetings!')
- >>> journal.send('Binary message', BINARY=b'\xde\xad\xbe\xef')
+ >>> journal.send('Hello world')
+ >>> journal.send('Hello, again, world', FIELD2='Greetings!')
+ >>> journal.send('Binary message', BINARY=b'\xde\xad\xbe\xef')
- Value of the MESSAGE argument will be used for the MESSAGE= field.
+ Value of the MESSAGE argument will be used for the MESSAGE=
+ field.
- MESSAGE_ID can be given to uniquely identify the type of message.
+ MESSAGE_ID can be given to uniquely identify the type of
+ message.
- Other parts of the message can be specified as keyword arguments.
+ Other parts of the message can be specified as keyword
+ arguments.
- Both MESSAGE and MESSAGE_ID, if present, must be strings, and will
- be sent as UTF-8 to journal. Other arguments can be bytes, in
- which case they will be sent as-is to journal.
+ Both MESSAGE and MESSAGE_ID, if present, must be strings, and
+ will be sent as UTF-8 to journal. Other arguments can be
+ bytes, in which case they will be sent as-is to journal.
- CODE_LINE, CODE_FILE, and CODE_FUNC can be specified to identify
- the caller. Unless at least on of the three is given, values are
- extracted from the stack frame of the caller of send(). CODE_FILE
- and CODE_FUNC must be strings, CODE_LINE must be an integer.
+ CODE_LINE, CODE_FILE, and CODE_FUNC can be specified to
+ identify the caller. Unless at least on of the three is given,
+ values are extracted from the stack frame of the caller of
+ send(). CODE_FILE and CODE_FUNC must be strings, CODE_LINE
+ must be an integer.
- Other useful fields include PRIORITY, SYSLOG_FACILITY,
- SYSLOG_IDENTIFIER, SYSLOG_PID.
- """
+ Other useful fields include PRIORITY, SYSLOG_FACILITY,
+ SYSLOG_IDENTIFIER, SYSLOG_PID.
+ """
- args = ['MESSAGE=' + MESSAGE]
+ args = ['MESSAGE=' + MESSAGE]
- if MESSAGE_ID is not None:
- args.append('MESSAGE_ID=' + MESSAGE_ID)
+ if MESSAGE_ID is not None:
+ args.append('MESSAGE_ID=' + MESSAGE_ID)
- if CODE_LINE == CODE_FILE == CODE_FUNC == None:
- CODE_FILE, CODE_LINE, CODE_FUNC = \
- _traceback.extract_stack(limit=2)[0][:3]
- if CODE_FILE is not None:
- args.append('CODE_FILE=' + CODE_FILE)
- if CODE_LINE is not None:
- args.append('CODE_LINE={:d}'.format(CODE_LINE))
- if CODE_FUNC is not None:
- args.append('CODE_FUNC=' + CODE_FUNC)
+ if CODE_LINE == CODE_FILE == CODE_FUNC == None:
+ CODE_FILE, CODE_LINE, CODE_FUNC = \
+ _traceback.extract_stack(limit=2)[0][:3]
+ if CODE_FILE is not None:
+ args.append('CODE_FILE=' + CODE_FILE)
+ if CODE_LINE is not None:
+ args.append('CODE_LINE={:d}'.format(CODE_LINE))
+ if CODE_FUNC is not None:
+ args.append('CODE_FUNC=' + CODE_FUNC)
- args.extend(_make_line(key, val) for key, val in kwargs.items())
- return sendv(*args)
+ args.extend(_make_line(key, val) for key, val in kwargs.items())
+ return sendv(*args)
def stream(identifier, priority=LOG_DEBUG, level_prefix=False):
- r"""Return a file object wrapping a stream to journal.
-
- Log messages written to this file as simple newline sepearted
- text strings are written to the journal.
-
- The file will be line buffered, so messages are actually sent
- after a newline character is written.
-
- >>> stream = journal.stream('myapp')
- >>> stream
- <open file '<fdopen>', mode 'w' at 0x...>
- >>> stream.write('message...\n')
-
- will produce the following message in the journal:
-
- PRIORITY=7
- SYSLOG_IDENTIFIER=myapp
- MESSAGE=message...
-
- Using the interface with print might be more convinient:
-
- >>> from __future__ import print_function
- >>> print('message...', file=stream)
+ r"""Return a file object wrapping a stream to journal.
- priority is the syslog priority, one of LOG_EMERG, LOG_ALERT,
- LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG.
+ Log messages written to this file as simple newline sepearted
+ text strings are written to the journal.
- level_prefix is a boolean. If true, kernel-style log priority
- level prefixes (such as '<1>') are interpreted. See sd-daemon(3)
- for more information.
- """
+ The file will be line buffered, so messages are actually sent
+ after a newline character is written.
- fd = stream_fd(identifier, priority, level_prefix)
- return _os.fdopen(fd, 'w', 1)
+ >>> stream = journal.stream('myapp')
+ >>> stream
+ <open file '<fdopen>', mode 'w' at 0x...>
+ >>> stream.write('message...\n')
+
+ will produce the following message in the journal:
+
+ PRIORITY=7
+ SYSLOG_IDENTIFIER=myapp
+ MESSAGE=message...
+
+ Using the interface with print might be more convinient:
+
+ >>> from __future__ import print_function
+ >>> print('message...', file=stream)
+
+ priority is the syslog priority, one of LOG_EMERG, LOG_ALERT,
+ LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG.
+
+ level_prefix is a boolean. If true, kernel-style log priority
+ level prefixes (such as '<1>') are interpreted. See
+ sd-daemon(3) for more information.
+ """
+
+ fd = stream_fd(identifier, priority, level_prefix)
+ return _os.fdopen(fd, 'w', 1)
+
+class JournalHandler(_logging.Handler):
+ """Journal handler class for the Python logging framework.
+
+ Please see the Python logging module documentation for an
+ overview: http://docs.python.org/library/logging.html
+
+ To create a custom logger whose messages go only to journal:
+
+ >>> log = logging.getLogger('custom_logger_name')
+ >>> log.propagate = False
+ >>> log.addHandler(journal.JournalHandler())
+ >>> log.warn("Some message: %s", detail)
+
+ Note that by default, message levels INFO and DEBUG are ignored
+ by the logging framework. To enable those log levels:
+
+ >>> log.setLevel(logging.DEBUG)
+
+ To attach journal MESSAGE_ID, an extra field is supported:
+
+ >>> log.warn("Message with ID",
+ >>> extra={'MESSAGE_ID': '22bb01335f724c959ac4799627d1cb61'})
+
+ To redirect all logging messages to journal regardless of where
+ they come from, attach it to the root logger:
+
+ >>> logging.root.addHandler(journal.JournalHandler())
+
+ For more complex configurations when using dictConfig or
+ fileConfig, specify 'systemd.journal.JournalHandler' as the
+ handler class. Only standard handler configuration options
+ are supported: level, formatter, filters.
+
+ The following journal fields will be sent:
+
+ MESSAGE, PRIORITY, THREAD_NAME, CODE_FILE, CODE_LINE,
+ CODE_FUNC, LOGGER (name as supplied to getLogger call),
+ MESSAGE_ID (optional, see above).
+ """
+
+ def emit(self, record):
+ """Write record as journal event.
+
+ MESSAGE is taken from the message provided by the
+ user, and PRIORITY, LOGGER, THREAD_NAME,
+ CODE_{FILE,LINE,FUNC} fields are appended
+ automatically. In addition, record.MESSAGE_ID will be
+ used if present.
+ """
+ try:
+ msg = self.format(record)
+ pri = self.mapPriority(record.levelno)
+ mid = getattr(record, 'MESSAGE_ID', None)
+ send(msg,
+ MESSAGE_ID=mid,
+ PRIORITY=format(pri),
+ LOGGER=record.name,
+ THREAD_NAME=record.threadName,
+ CODE_FILE=record.pathname,
+ CODE_LINE=record.lineno,
+ CODE_FUNC=record.funcName)
+ except Exception:
+ self.handleError(record)
+
+ @staticmethod
+ def mapPriority(levelno):
+ """Map logging levels to journald priorities.
+
+ Since Python log level numbers are "sparse", we have
+ to map numbers in between the standard levels too.
+ """
+ if levelno <= _logging.DEBUG:
+ return LOG_DEBUG
+ elif levelno <= _logging.INFO:
+ return LOG_INFO
+ elif levelno <= _logging.WARNING:
+ return LOG_WARNING
+ elif levelno <= _logging.ERROR:
+ return LOG_ERR
+ elif levelno <= _logging.CRITICAL:
+ return LOG_CRIT
+ else:
+ return LOG_ALERT
~ianmdlvl / elogind.git / blobdiff