Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/coloredlogs/syslog.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Easy to use system logging for Python's logging module. |
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2 # |
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3 # Author: Peter Odding <peter@peterodding.com> |
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4 # Last Change: December 10, 2020 |
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5 # URL: https://coloredlogs.readthedocs.io |
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6 |
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7 """ |
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8 Easy to use UNIX system logging for Python's :mod:`logging` module. |
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9 |
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10 Admittedly system logging has little to do with colored terminal output, however: |
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11 |
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12 - The `coloredlogs` package is my attempt to do Python logging right and system |
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13 logging is an important part of that equation. |
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14 |
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15 - I've seen a surprising number of quirks and mistakes in system logging done |
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16 in Python, for example including ``%(asctime)s`` in a format string (the |
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17 system logging daemon is responsible for adding timestamps and thus you end |
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18 up with duplicate timestamps that make the logs awful to read :-). |
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19 |
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20 - The ``%(programname)s`` filter originated in my system logging code and I |
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21 wanted it in `coloredlogs` so the step to include this module wasn't that big. |
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22 |
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23 - As a bonus this Python module now has a test suite and proper documentation. |
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24 |
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25 So there :-P. Go take a look at :func:`enable_system_logging()`. |
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26 """ |
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27 |
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28 # Standard library modules. |
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29 import logging |
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30 import logging.handlers |
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31 import os |
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32 import socket |
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33 import sys |
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34 |
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35 # External dependencies. |
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36 from humanfriendly import coerce_boolean |
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37 from humanfriendly.compat import on_macos, on_windows |
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38 |
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39 # Modules included in our package. |
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40 from coloredlogs import ( |
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41 DEFAULT_LOG_LEVEL, |
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42 ProgramNameFilter, |
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43 adjust_level, |
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44 find_program_name, |
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45 level_to_number, |
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46 replace_handler, |
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47 ) |
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48 |
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49 LOG_DEVICE_MACOSX = '/var/run/syslog' |
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50 """The pathname of the log device on Mac OS X (a string).""" |
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51 |
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52 LOG_DEVICE_UNIX = '/dev/log' |
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53 """The pathname of the log device on Linux and most other UNIX systems (a string).""" |
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54 |
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55 DEFAULT_LOG_FORMAT = '%(programname)s[%(process)d]: %(levelname)s %(message)s' |
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56 """ |
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57 The default format for log messages sent to the system log (a string). |
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58 |
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59 The ``%(programname)s`` format requires :class:`~coloredlogs.ProgramNameFilter` |
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60 but :func:`enable_system_logging()` takes care of this for you. |
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61 |
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62 The ``name[pid]:`` construct (specifically the colon) in the format allows |
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63 rsyslogd_ to extract the ``$programname`` from each log message, which in turn |
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64 allows configuration files in ``/etc/rsyslog.d/*.conf`` to filter these log |
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65 messages to a separate log file (if the need arises). |
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66 |
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67 .. _rsyslogd: https://en.wikipedia.org/wiki/Rsyslog |
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68 """ |
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69 |
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70 # Initialize a logger for this module. |
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71 logger = logging.getLogger(__name__) |
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72 |
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73 |
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74 class SystemLogging(object): |
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75 |
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76 """Context manager to enable system logging.""" |
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77 |
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78 def __init__(self, *args, **kw): |
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79 """ |
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80 Initialize a :class:`SystemLogging` object. |
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81 |
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82 :param args: Positional arguments to :func:`enable_system_logging()`. |
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83 :param kw: Keyword arguments to :func:`enable_system_logging()`. |
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84 """ |
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85 self.args = args |
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86 self.kw = kw |
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87 self.handler = None |
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88 |
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89 def __enter__(self): |
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90 """Enable system logging when entering the context.""" |
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91 if self.handler is None: |
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92 self.handler = enable_system_logging(*self.args, **self.kw) |
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93 return self.handler |
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94 |
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95 def __exit__(self, exc_type=None, exc_value=None, traceback=None): |
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96 """ |
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97 Disable system logging when leaving the context. |
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98 |
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99 .. note:: If an exception is being handled when we leave the context a |
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100 warning message including traceback is logged *before* system |
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101 logging is disabled. |
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102 """ |
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103 if self.handler is not None: |
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104 if exc_type is not None: |
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105 logger.warning("Disabling system logging due to unhandled exception!", exc_info=True) |
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106 (self.kw.get('logger') or logging.getLogger()).removeHandler(self.handler) |
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107 self.handler = None |
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108 |
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109 |
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110 def enable_system_logging(programname=None, fmt=None, logger=None, reconfigure=True, **kw): |
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111 """ |
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112 Redirect :mod:`logging` messages to the system log (e.g. ``/var/log/syslog``). |
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113 |
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114 :param programname: The program name to embed in log messages (a string, defaults |
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115 to the result of :func:`~coloredlogs.find_program_name()`). |
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116 :param fmt: The log format for system log messages (a string, defaults to |
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117 :data:`DEFAULT_LOG_FORMAT`). |
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118 :param logger: The logger to which the :class:`~logging.handlers.SysLogHandler` |
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119 should be connected (defaults to the root logger). |
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120 :param level: The logging level for the :class:`~logging.handlers.SysLogHandler` |
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121 (defaults to :data:`.DEFAULT_LOG_LEVEL`). This value is coerced |
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122 using :func:`~coloredlogs.level_to_number()`. |
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123 :param reconfigure: If :data:`True` (the default) multiple calls to |
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124 :func:`enable_system_logging()` will each override |
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125 the previous configuration. |
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126 :param kw: Refer to :func:`connect_to_syslog()`. |
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127 :returns: A :class:`~logging.handlers.SysLogHandler` object or |
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128 :data:`None`. If an existing handler is found and `reconfigure` |
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129 is :data:`False` the existing handler object is returned. If the |
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130 connection to the system logging daemon fails :data:`None` is |
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131 returned. |
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132 |
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133 As of release 15.0 this function uses :func:`is_syslog_supported()` to |
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134 check whether system logging is supported and appropriate before it's |
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135 enabled. |
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136 |
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137 .. note:: When the logger's effective level is too restrictive it is |
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138 relaxed (refer to `notes about log levels`_ for details). |
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139 """ |
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140 # Check whether system logging is supported / appropriate. |
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141 if not is_syslog_supported(): |
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142 return None |
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143 # Provide defaults for omitted arguments. |
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144 programname = programname or find_program_name() |
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145 logger = logger or logging.getLogger() |
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146 fmt = fmt or DEFAULT_LOG_FORMAT |
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147 level = level_to_number(kw.get('level', DEFAULT_LOG_LEVEL)) |
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148 # Check whether system logging is already enabled. |
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149 handler, logger = replace_handler(logger, match_syslog_handler, reconfigure) |
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150 # Make sure reconfiguration is allowed or not relevant. |
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151 if not (handler and not reconfigure): |
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152 # Create a system logging handler. |
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153 handler = connect_to_syslog(**kw) |
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154 # Make sure the handler was successfully created. |
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155 if handler: |
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156 # Enable the use of %(programname)s. |
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157 ProgramNameFilter.install(handler=handler, fmt=fmt, programname=programname) |
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158 # Connect the formatter, handler and logger. |
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159 handler.setFormatter(logging.Formatter(fmt)) |
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160 logger.addHandler(handler) |
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161 # Adjust the level of the selected logger. |
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162 adjust_level(logger, level) |
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163 return handler |
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164 |
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165 |
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166 def connect_to_syslog(address=None, facility=None, level=None): |
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167 """ |
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168 Create a :class:`~logging.handlers.SysLogHandler`. |
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169 |
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170 :param address: The device file or network address of the system logging |
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171 daemon (a string or tuple, defaults to the result of |
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172 :func:`find_syslog_address()`). |
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173 :param facility: Refer to :class:`~logging.handlers.SysLogHandler`. |
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174 Defaults to ``LOG_USER``. |
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175 :param level: The logging level for the :class:`~logging.handlers.SysLogHandler` |
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176 (defaults to :data:`.DEFAULT_LOG_LEVEL`). This value is coerced |
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177 using :func:`~coloredlogs.level_to_number()`. |
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178 :returns: A :class:`~logging.handlers.SysLogHandler` object or :data:`None` (if the |
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179 system logging daemon is unavailable). |
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180 |
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181 The process of connecting to the system logging daemon goes as follows: |
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182 |
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183 - The following two socket types are tried (in decreasing preference): |
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184 |
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185 1. :data:`~socket.SOCK_RAW` avoids truncation of log messages but may |
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186 not be supported. |
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187 2. :data:`~socket.SOCK_STREAM` (TCP) supports longer messages than the |
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188 default (which is UDP). |
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189 """ |
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190 if not address: |
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191 address = find_syslog_address() |
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192 if facility is None: |
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193 facility = logging.handlers.SysLogHandler.LOG_USER |
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194 if level is None: |
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195 level = DEFAULT_LOG_LEVEL |
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196 for socktype in socket.SOCK_RAW, socket.SOCK_STREAM, None: |
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197 kw = dict(facility=facility, address=address) |
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198 if socktype is not None: |
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199 kw['socktype'] = socktype |
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200 try: |
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201 handler = logging.handlers.SysLogHandler(**kw) |
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202 except IOError: |
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203 # IOError is a superclass of socket.error which can be raised if the system |
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204 # logging daemon is unavailable. |
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205 pass |
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206 else: |
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207 handler.setLevel(level_to_number(level)) |
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208 return handler |
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209 |
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210 |
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211 def find_syslog_address(): |
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212 """ |
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213 Find the most suitable destination for system log messages. |
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214 |
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215 :returns: The pathname of a log device (a string) or an address/port tuple as |
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216 supported by :class:`~logging.handlers.SysLogHandler`. |
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217 |
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218 On Mac OS X this prefers :data:`LOG_DEVICE_MACOSX`, after that :data:`LOG_DEVICE_UNIX` |
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219 is checked for existence. If both of these device files don't exist the default used |
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220 by :class:`~logging.handlers.SysLogHandler` is returned. |
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221 """ |
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222 if sys.platform == 'darwin' and os.path.exists(LOG_DEVICE_MACOSX): |
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223 return LOG_DEVICE_MACOSX |
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224 elif os.path.exists(LOG_DEVICE_UNIX): |
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225 return LOG_DEVICE_UNIX |
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226 else: |
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227 return 'localhost', logging.handlers.SYSLOG_UDP_PORT |
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228 |
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229 |
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230 def is_syslog_supported(): |
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231 """ |
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232 Determine whether system logging is supported. |
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233 |
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234 :returns: |
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235 |
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236 :data:`True` if system logging is supported and can be enabled, |
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237 :data:`False` if system logging is not supported or there are good |
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238 reasons for not enabling it. |
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239 |
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240 The decision making process here is as follows: |
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241 |
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242 Override |
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243 If the environment variable ``$COLOREDLOGS_SYSLOG`` is set it is evaluated |
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244 using :func:`~humanfriendly.coerce_boolean()` and the resulting value |
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245 overrides the platform detection discussed below, this allows users to |
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246 override the decision making process if they disagree / know better. |
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247 |
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248 Linux / UNIX |
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249 On systems that are not Windows or MacOS (see below) we assume UNIX which |
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250 means either syslog is available or sending a bunch of UDP packets to |
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251 nowhere won't hurt anyone... |
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252 |
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253 Microsoft Windows |
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254 Over the years I've had multiple reports of :pypi:`coloredlogs` spewing |
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255 extremely verbose errno 10057 warning messages to the console (once for |
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256 each log message I suppose) so I now assume it a default that |
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257 "syslog-style system logging" is not generally available on Windows. |
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258 |
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259 Apple MacOS |
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260 There's cPython issue `#38780`_ which seems to result in a fatal exception |
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261 when the Python interpreter shuts down. This is (way) worse than not |
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262 having system logging enabled. The error message mentioned in `#38780`_ |
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263 has actually been following me around for years now, see for example: |
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264 |
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265 - https://github.com/xolox/python-rotate-backups/issues/9 mentions Docker |
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266 images implying Linux, so not strictly the same as `#38780`_. |
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267 |
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268 - https://github.com/xolox/python-npm-accel/issues/4 is definitely related |
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269 to `#38780`_ and is what eventually prompted me to add the |
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270 :func:`is_syslog_supported()` logic. |
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271 |
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272 .. _#38780: https://bugs.python.org/issue38780 |
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273 """ |
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274 override = os.environ.get("COLOREDLOGS_SYSLOG") |
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275 if override is not None: |
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276 return coerce_boolean(override) |
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277 else: |
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278 return not (on_windows() or on_macos()) |
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279 |
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280 |
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281 def match_syslog_handler(handler): |
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282 """ |
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283 Identify system logging handlers. |
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284 |
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285 :param handler: The :class:`~logging.Handler` class to check. |
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286 :returns: :data:`True` if the handler is a |
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287 :class:`~logging.handlers.SysLogHandler`, |
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288 :data:`False` otherwise. |
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289 |
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290 This function can be used as a callback for :func:`.find_handler()`. |
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291 """ |
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292 return isinstance(handler, logging.handlers.SysLogHandler) |