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344 lines
12 KiB
Python
344 lines
12 KiB
Python
2 years ago
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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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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 colorama # type: ignore
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except ImportError:
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colorama = None
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try:
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import curses
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except ImportError:
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curses = None # type: ignore
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from typing import Dict, Any, cast, Optional
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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() -> bool:
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try:
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if hasattr(sys.stderr, "isatty") and sys.stderr.isatty():
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if curses:
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curses.setupterm()
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if curses.tigetnum("colors") > 0:
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return True
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elif colorama:
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if sys.stderr is getattr(
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colorama.initialise, "wrapped_stderr", object()
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):
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return True
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except Exception:
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# Very broad exception handling because it's always better to
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# fall back to non-colored logs than to break at startup.
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pass
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return False
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def _safe_unicode(s: Any) -> str:
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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` or `tornado.options.parse_config_file`
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(unless ``--logging=none`` is used).
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Color support on Windows versions that do not support ANSI color codes is
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enabled by use of the colorama__ library. Applications that wish to use
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this must first initialize colorama with a call to ``colorama.init``.
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See the colorama documentation for details.
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__ https://pypi.python.org/pypi/colorama
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.. versionchanged:: 4.5
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Added support for ``colorama``. Changed the constructor
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signature to be compatible with `logging.config.dictConfig`.
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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" # noqa: E501
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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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logging.CRITICAL: 5, # Magenta
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}
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def __init__(
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self,
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fmt: str = DEFAULT_FORMAT,
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datefmt: str = DEFAULT_DATE_FORMAT,
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style: str = "%",
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color: bool = True,
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colors: Dict[int, int] = DEFAULT_COLORS,
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) -> None:
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r"""
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:arg bool color: Enables color support.
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:arg str 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 str 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 = {} # type: Dict[int, str]
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if color and _stderr_supports_color():
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if curses is not None:
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fg_color = curses.tigetstr("setaf") or curses.tigetstr("setf") or b""
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for levelno, code in colors.items():
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# Convert the terminal control characters from
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# bytes to unicode strings for easier use with the
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# logging module.
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self._colors[levelno] = unicode_type(
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curses.tparm(fg_color, code), "ascii"
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)
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normal = curses.tigetstr("sgr0")
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if normal is not None:
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self._normal = unicode_type(normal, "ascii")
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else:
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self._normal = ""
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else:
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# If curses is not present (currently we'll only get here for
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# colorama on windows), assume hard-coded ANSI color codes.
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for levelno, code in colors.items():
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self._colors[levelno] = "\033[2;3%dm" % code
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self._normal = "\033[0m"
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else:
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self._normal = ""
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def format(self, record: Any) -> str:
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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 wherever 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, cast(str, 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(
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options: Any = None, logger: Optional[logging.Logger] = None
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) -> 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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import tornado.options
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options = tornado.options.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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rotate_mode = options.log_rotate_mode
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if rotate_mode == "size":
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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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encoding="utf-8",
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) # type: logging.Handler
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elif rotate_mode == "time":
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channel = logging.handlers.TimedRotatingFileHandler(
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filename=options.log_file_prefix,
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when=options.log_rotate_when,
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interval=options.log_rotate_interval,
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backupCount=options.log_file_num_backups,
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encoding="utf-8",
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)
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else:
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error_message = (
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"The value of log_rotate_mode option should be "
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+ '"size" or "time", not "%s".' % rotate_mode
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)
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raise ValueError(error_message)
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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 (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: Any = None) -> None:
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"""Add logging-related flags to ``options``.
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These options are present automatically on the default options instance;
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this method is only necessary if you have created your own `.OptionParser`.
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.. versionadded:: 4.2
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This function existed in prior versions but was broken and undocumented until 4.2.
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"""
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if options is None:
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# late import to prevent cycle
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import tornado.options
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options = tornado.options.options
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options.define(
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"logging",
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default="info",
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help=(
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"Set the Python log level. If 'none', tornado won't touch the "
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"logging configuration."
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),
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metavar="debug|info|warning|error|none",
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)
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options.define(
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"log_to_stderr",
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type=bool,
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default=None,
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help=(
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"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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),
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)
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options.define(
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"log_file_prefix",
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type=str,
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default=None,
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metavar="PATH",
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help=(
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"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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),
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)
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options.define(
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"log_file_max_size",
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type=int,
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default=100 * 1000 * 1000,
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help="max size of log files before rollover",
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)
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options.define(
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"log_file_num_backups", type=int, default=10, help="number of log files to keep"
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)
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options.define(
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"log_rotate_when",
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type=str,
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default="midnight",
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help=(
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"specify the type of TimedRotatingFileHandler interval "
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"other options:('S', 'M', 'H', 'D', 'W0'-'W6')"
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),
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)
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options.define(
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"log_rotate_interval",
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type=int,
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default=1,
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help="The interval value of timed rotating",
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)
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options.define(
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"log_rotate_mode",
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type=str,
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default="size",
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help="The mode of rotating files(time or size)",
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)
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options.add_parse_callback(lambda: enable_pretty_logging(options))
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