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231 lines
9.2 KiB
Python
231 lines
9.2 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2012 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Logging support for Tornado.
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Tornado uses three logger streams:
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* ``tornado.access``: Per-request logging for Tornado's HTTP servers (and
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potentially other servers in the future)
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* ``tornado.application``: Logging of errors from application code (i.e.
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uncaught exceptions from callbacks)
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* ``tornado.general``: General-purpose logging, including any errors
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or warnings from Tornado itself.
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These streams may be configured independently using the standard library's
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`logging` module. For example, you may wish to send ``tornado.access`` logs
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to a separate file for analysis.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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import logging
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import logging.handlers
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import sys
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from tornado.escape import _unicode
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from tornado.util import unicode_type, basestring_type
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try:
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import curses
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except ImportError:
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curses = None
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# Logger objects for internal tornado use
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access_log = logging.getLogger("tornado.access")
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app_log = logging.getLogger("tornado.application")
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gen_log = logging.getLogger("tornado.general")
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def _stderr_supports_color():
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color = False
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if curses and hasattr(sys.stderr, 'isatty') and sys.stderr.isatty():
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try:
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curses.setupterm()
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if curses.tigetnum("colors") > 0:
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color = True
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except Exception:
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pass
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return color
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def _safe_unicode(s):
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try:
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return _unicode(s)
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except UnicodeDecodeError:
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return repr(s)
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class LogFormatter(logging.Formatter):
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"""Log formatter used in Tornado.
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Key features of this formatter are:
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* Color support when logging to a terminal that supports it.
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* Timestamps on every log line.
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* Robust against str/bytes encoding problems.
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This formatter is enabled automatically by
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`tornado.options.parse_command_line` (unless ``--logging=none`` is
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used).
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"""
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DEFAULT_FORMAT = '%(color)s[%(levelname)1.1s %(asctime)s %(module)s:%(lineno)d]%(end_color)s %(message)s'
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DEFAULT_DATE_FORMAT = '%y%m%d %H:%M:%S'
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DEFAULT_COLORS = {
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logging.DEBUG: 4, # Blue
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logging.INFO: 2, # Green
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logging.WARNING: 3, # Yellow
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logging.ERROR: 1, # Red
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}
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def __init__(self, color=True, fmt=DEFAULT_FORMAT,
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datefmt=DEFAULT_DATE_FORMAT, colors=DEFAULT_COLORS):
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r"""
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:arg bool color: Enables color support.
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:arg string fmt: Log message format.
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It will be applied to the attributes dict of log records. The
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text between ``%(color)s`` and ``%(end_color)s`` will be colored
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depending on the level if color support is on.
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:arg dict colors: color mappings from logging level to terminal color
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code
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:arg string datefmt: Datetime format.
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Used for formatting ``(asctime)`` placeholder in ``prefix_fmt``.
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.. versionchanged:: 3.2
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Added ``fmt`` and ``datefmt`` arguments.
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"""
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logging.Formatter.__init__(self, datefmt=datefmt)
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self._fmt = fmt
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self._colors = {}
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if color and _stderr_supports_color():
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# The curses module has some str/bytes confusion in
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# python3. Until version 3.2.3, most methods return
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# bytes, but only accept strings. In addition, we want to
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# output these strings with the logging module, which
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# works with unicode strings. The explicit calls to
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# unicode() below are harmless in python2 but will do the
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# right conversion in python 3.
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fg_color = (curses.tigetstr("setaf") or
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curses.tigetstr("setf") or "")
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if (3, 0) < sys.version_info < (3, 2, 3):
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fg_color = unicode_type(fg_color, "ascii")
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for levelno, code in colors.items():
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self._colors[levelno] = unicode_type(curses.tparm(fg_color, code), "ascii")
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self._normal = unicode_type(curses.tigetstr("sgr0"), "ascii")
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else:
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self._normal = ''
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def format(self, record):
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try:
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message = record.getMessage()
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assert isinstance(message, basestring_type) # guaranteed by logging
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# Encoding notes: The logging module prefers to work with character
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# strings, but only enforces that log messages are instances of
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# basestring. In python 2, non-ascii bytestrings will make
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# their way through the logging framework until they blow up with
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# an unhelpful decoding error (with this formatter it happens
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# when we attach the prefix, but there are other opportunities for
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# exceptions further along in the framework).
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#
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# If a byte string makes it this far, convert it to unicode to
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# ensure it will make it out to the logs. Use repr() as a fallback
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# to ensure that all byte strings can be converted successfully,
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# but don't do it by default so we don't add extra quotes to ascii
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# bytestrings. This is a bit of a hacky place to do this, but
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# it's worth it since the encoding errors that would otherwise
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# result are so useless (and tornado is fond of using utf8-encoded
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# byte strings whereever possible).
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record.message = _safe_unicode(message)
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except Exception as e:
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record.message = "Bad message (%r): %r" % (e, record.__dict__)
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record.asctime = self.formatTime(record, self.datefmt)
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if record.levelno in self._colors:
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record.color = self._colors[record.levelno]
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record.end_color = self._normal
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else:
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record.color = record.end_color = ''
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formatted = self._fmt % record.__dict__
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if record.exc_info:
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if not record.exc_text:
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record.exc_text = self.formatException(record.exc_info)
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if record.exc_text:
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# exc_text contains multiple lines. We need to _safe_unicode
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# each line separately so that non-utf8 bytes don't cause
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# all the newlines to turn into '\n'.
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lines = [formatted.rstrip()]
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lines.extend(_safe_unicode(ln) for ln in record.exc_text.split('\n'))
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formatted = '\n'.join(lines)
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return formatted.replace("\n", "\n ")
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def enable_pretty_logging(options=None, logger=None):
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"""Turns on formatted logging output as configured.
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This is called automatically by `tornado.options.parse_command_line`
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and `tornado.options.parse_config_file`.
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"""
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if options is None:
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from tornado.options import options
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if options.logging is None or options.logging.lower() == 'none':
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return
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if logger is None:
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logger = logging.getLogger()
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logger.setLevel(getattr(logging, options.logging.upper()))
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if options.log_file_prefix:
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channel = logging.handlers.RotatingFileHandler(
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filename=options.log_file_prefix,
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maxBytes=options.log_file_max_size,
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backupCount=options.log_file_num_backups)
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channel.setFormatter(LogFormatter(color=False))
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logger.addHandler(channel)
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if (options.log_to_stderr or
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(options.log_to_stderr is None and not logger.handlers)):
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# Set up color if we are in a tty and curses is installed
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channel = logging.StreamHandler()
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channel.setFormatter(LogFormatter())
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logger.addHandler(channel)
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def define_logging_options(options=None):
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if options is None:
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# late import to prevent cycle
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from tornado.options import options
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options.define("logging", default="info",
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help=("Set the Python log level. If 'none', tornado won't touch the "
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"logging configuration."),
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metavar="debug|info|warning|error|none")
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options.define("log_to_stderr", type=bool, default=None,
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help=("Send log output to stderr (colorized if possible). "
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"By default use stderr if --log_file_prefix is not set and "
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"no other logging is configured."))
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options.define("log_file_prefix", type=str, default=None, metavar="PATH",
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help=("Path prefix for log files. "
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"Note that if you are running multiple tornado processes, "
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"log_file_prefix must be different for each of them (e.g. "
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"include the port number)"))
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options.define("log_file_max_size", type=int, default=100 * 1000 * 1000,
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help="max size of log files before rollover")
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options.define("log_file_num_backups", type=int, default=10,
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help="number of log files to keep")
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options.add_parse_callback(enable_pretty_logging)
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