1 # -*- Mode: python; coding:utf-8; indent-tabs-mode: nil -*- */
3 # This file is part of systemd.
5 # Copyright 2012 David Strauss <david@davidstrauss.net>
6 # Copyright 2012 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
7 # Copyright 2012 Marti Raudsepp <marti@juffo.org>
9 # systemd is free software; you can redistribute it and/or modify it
10 # under the terms of the GNU Lesser General Public License as published by
11 # the Free Software Foundation; either version 2.1 of the License, or
12 # (at your option) any later version.
14 # systemd is distributed in the hope that it will be useful, but
15 # WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 # Lesser General Public License for more details.
19 # You should have received a copy of the GNU Lesser General Public License
20 # along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 import traceback as _traceback
27 import logging as _logging
28 from syslog import (LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR,
29 LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG)
30 from ._journal import sendv, stream_fd
31 from ._reader import (_Journal, NOP, APPEND, INVALIDATE,
32 LOCAL_ONLY, RUNTIME_ONLY, SYSTEM_ONLY)
34 class Journal(_Journal):
35 def __new__(cls, *args, **kwargs):
36 self = _Journal.__new__(cls, *args, **kwargs)
37 if sys.version_info[0] >= 3:
38 self.default_call = functools.partial(str, encoding='utf-8')
40 self.default_call = functools.partial(unicode, encoding='utf-8')
45 'USERSPACE_USEC': int,
51 'SYSLOG_FACILITY': int,
53 '_AUDIT_SESSION': int,
54 '_AUDIT_LOGINUID': int,
55 '_SYSTEMD_SESSION': int,
56 '_SYSTEMD_OWNER_UID': int,
60 '_SOURCE_REALTIME_TIMESTAMP': lambda x: datetime.datetime.fromtimestamp(float(x)/1E6),
61 '__REALTIME_TIMESTAMP': lambda x: datetime.datetime.fromtimestamp(float(x)/1E6),
62 '_SOURCE_MONOTONIC_TIMESTAMP': lambda x: datetime.timedelta(microseconds=float(x)),
63 '__MONOTONIC_TIMESTAMP': lambda x: datetime.timedelta(microseconds=float(x)),
67 'COREDUMP_SESSION': int,
68 'COREDUMP_SIGNAL': int,
69 'COREDUMP_TIMESTAMP': lambda x: datetime.datetime.fromtimestamp(float(x)/1E6),
71 if sys.version_info[0] >= 3:
72 self.call_dict['COREDUMP'] = bytes
74 self.call_dict['COREDUMP'] = str
77 def _make_line(field, value):
78 if isinstance(value, bytes):
79 return field.encode('utf-8') + b'=' + value
81 return field + '=' + value
83 def send(MESSAGE, MESSAGE_ID=None,
84 CODE_FILE=None, CODE_LINE=None, CODE_FUNC=None,
86 r"""Send a message to the journal.
88 >>> journal.send('Hello world')
89 >>> journal.send('Hello, again, world', FIELD2='Greetings!')
90 >>> journal.send('Binary message', BINARY=b'\xde\xad\xbe\xef')
92 Value of the MESSAGE argument will be used for the MESSAGE=
93 field. MESSAGE must be a string and will be sent as UTF-8 to
96 MESSAGE_ID can be given to uniquely identify the type of
97 message. It must be a string or a uuid.UUID object.
99 CODE_LINE, CODE_FILE, and CODE_FUNC can be specified to
100 identify the caller. Unless at least on of the three is given,
101 values are extracted from the stack frame of the caller of
102 send(). CODE_FILE and CODE_FUNC must be strings, CODE_LINE
105 Additional fields for the journal entry can only be specified
106 as keyword arguments. The payload can be either a string or
107 bytes. A string will be sent as UTF-8, and bytes will be sent
108 as-is to the journal.
110 Other useful fields include PRIORITY, SYSLOG_FACILITY,
111 SYSLOG_IDENTIFIER, SYSLOG_PID.
114 args = ['MESSAGE=' + MESSAGE]
116 if MESSAGE_ID is not None:
117 id = getattr(MESSAGE_ID, 'hex', MESSAGE_ID)
118 args.append('MESSAGE_ID=' + id)
120 if CODE_LINE == CODE_FILE == CODE_FUNC == None:
121 CODE_FILE, CODE_LINE, CODE_FUNC = \
122 _traceback.extract_stack(limit=2)[0][:3]
123 if CODE_FILE is not None:
124 args.append('CODE_FILE=' + CODE_FILE)
125 if CODE_LINE is not None:
126 args.append('CODE_LINE={:d}'.format(CODE_LINE))
127 if CODE_FUNC is not None:
128 args.append('CODE_FUNC=' + CODE_FUNC)
130 args.extend(_make_line(key, val) for key, val in kwargs.items())
133 def stream(identifier, priority=LOG_DEBUG, level_prefix=False):
134 r"""Return a file object wrapping a stream to journal.
136 Log messages written to this file as simple newline sepearted
137 text strings are written to the journal.
139 The file will be line buffered, so messages are actually sent
140 after a newline character is written.
142 >>> stream = journal.stream('myapp')
144 <open file '<fdopen>', mode 'w' at 0x...>
145 >>> stream.write('message...\n')
147 will produce the following message in the journal::
150 SYSLOG_IDENTIFIER=myapp
153 Using the interface with print might be more convinient:
155 >>> from __future__ import print_function
156 >>> print('message...', file=stream)
158 priority is the syslog priority, one of `LOG_EMERG`,
159 `LOG_ALERT`, `LOG_CRIT`, `LOG_ERR`, `LOG_WARNING`,
160 `LOG_NOTICE`, `LOG_INFO`, `LOG_DEBUG`.
162 level_prefix is a boolean. If true, kernel-style log priority
163 level prefixes (such as '<1>') are interpreted. See
164 sd-daemon(3) for more information.
167 fd = stream_fd(identifier, priority, level_prefix)
168 return _os.fdopen(fd, 'w', 1)
170 class JournalHandler(_logging.Handler):
171 """Journal handler class for the Python logging framework.
173 Please see the Python logging module documentation for an
174 overview: http://docs.python.org/library/logging.html.
176 To create a custom logger whose messages go only to journal:
178 >>> log = logging.getLogger('custom_logger_name')
179 >>> log.propagate = False
180 >>> log.addHandler(journal.JournalHandler())
181 >>> log.warn("Some message: %s", detail)
183 Note that by default, message levels `INFO` and `DEBUG` are
184 ignored by the logging framework. To enable those log levels:
186 >>> log.setLevel(logging.DEBUG)
188 To attach journal MESSAGE_ID, an extra field is supported:
191 >>> mid = uuid.UUID('0123456789ABCDEF0123456789ABCDEF')
192 >>> log.warn("Message with ID", extra={'MESSAGE_ID': mid})
194 To redirect all logging messages to journal regardless of where
195 they come from, attach it to the root logger:
197 >>> logging.root.addHandler(journal.JournalHandler())
199 For more complex configurations when using `dictConfig` or
200 `fileConfig`, specify `systemd.journal.JournalHandler` as the
201 handler class. Only standard handler configuration options
202 are supported: `level`, `formatter`, `filters`.
204 The following journal fields will be sent:
205 `MESSAGE`, `PRIORITY`, `THREAD_NAME`, `CODE_FILE`, `CODE_LINE`,
206 `CODE_FUNC`, `LOGGER` (name as supplied to getLogger call),
207 `MESSAGE_ID` (optional, see above).
210 def emit(self, record):
211 """Write record as journal event.
213 MESSAGE is taken from the message provided by the
214 user, and PRIORITY, LOGGER, THREAD_NAME,
215 CODE_{FILE,LINE,FUNC} fields are appended
216 automatically. In addition, record.MESSAGE_ID will be
220 msg = self.format(record)
221 pri = self.mapPriority(record.levelno)
222 mid = getattr(record, 'MESSAGE_ID', None)
225 PRIORITY=format(pri),
227 THREAD_NAME=record.threadName,
228 CODE_FILE=record.pathname,
229 CODE_LINE=record.lineno,
230 CODE_FUNC=record.funcName)
232 self.handleError(record)
235 def mapPriority(levelno):
236 """Map logging levels to journald priorities.
238 Since Python log level numbers are "sparse", we have
239 to map numbers in between the standard levels too.
241 if levelno <= _logging.DEBUG:
243 elif levelno <= _logging.INFO:
245 elif levelno <= _logging.WARNING:
247 elif levelno <= _logging.ERROR:
249 elif levelno <= _logging.CRITICAL: