Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/coloredlogs/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Colored terminal output 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 Colored terminal output for Python's :mod:`logging` module. |
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9 |
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10 .. contents:: |
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11 :local: |
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12 |
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13 Getting started |
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14 =============== |
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15 |
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16 The easiest way to get started is by importing :mod:`coloredlogs` and calling |
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17 :mod:`coloredlogs.install()` (similar to :func:`logging.basicConfig()`): |
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18 |
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19 >>> import coloredlogs, logging |
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20 >>> coloredlogs.install(level='DEBUG') |
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21 >>> logger = logging.getLogger('some.module.name') |
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22 >>> logger.info("this is an informational message") |
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23 2015-10-22 19:13:52 peter-macbook some.module.name[28036] INFO this is an informational message |
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24 |
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25 The :mod:`~coloredlogs.install()` function creates a :class:`ColoredFormatter` |
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26 that injects `ANSI escape sequences`_ into the log output. |
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27 |
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28 .. _ANSI escape sequences: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors |
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29 |
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30 Environment variables |
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31 ===================== |
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32 |
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33 The following environment variables can be used to configure the |
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34 :mod:`coloredlogs` module without writing any code: |
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35 |
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36 ============================= ============================ ================================== |
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37 Environment variable Default value Type of value |
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38 ============================= ============================ ================================== |
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39 ``$COLOREDLOGS_AUTO_INSTALL`` 'false' a boolean that controls whether |
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40 :func:`auto_install()` is called |
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41 ``$COLOREDLOGS_LOG_LEVEL`` 'INFO' a log level name |
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42 ``$COLOREDLOGS_LOG_FORMAT`` :data:`DEFAULT_LOG_FORMAT` a log format string |
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43 ``$COLOREDLOGS_DATE_FORMAT`` :data:`DEFAULT_DATE_FORMAT` a date/time format string |
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44 ``$COLOREDLOGS_LEVEL_STYLES`` :data:`DEFAULT_LEVEL_STYLES` see :func:`parse_encoded_styles()` |
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45 ``$COLOREDLOGS_FIELD_STYLES`` :data:`DEFAULT_FIELD_STYLES` see :func:`parse_encoded_styles()` |
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46 ============================= ============================ ================================== |
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47 |
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48 If the environment variable `$NO_COLOR`_ is set (the value doesn't matter, even |
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49 an empty string will do) then :func:`coloredlogs.install()` will take this as a |
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50 hint that colors should not be used (unless the ``isatty=True`` override was |
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51 passed by the caller). |
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52 |
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53 .. _$NO_COLOR: https://no-color.org/ |
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54 |
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55 Examples of customization |
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56 ========================= |
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57 |
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58 Here we'll take a look at some examples of how you can customize |
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59 :mod:`coloredlogs` using environment variables. |
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60 |
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61 .. contents:: |
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62 :local: |
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63 |
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64 About the defaults |
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65 ------------------ |
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66 |
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67 Here's a screen shot of the default configuration for easy comparison with the |
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68 screen shots of the following customizations (this is the same screen shot that |
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69 is shown in the introduction): |
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70 |
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71 .. image:: images/defaults.png |
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72 :alt: Screen shot of colored logging with defaults. |
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73 |
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74 The screen shot above was taken from ``urxvt`` which doesn't support faint text |
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75 colors, otherwise the color of green used for `debug` messages would have |
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76 differed slightly from the color of green used for `spam` messages. |
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77 |
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78 Apart from the `faint` style of the `spam` level, the default configuration of |
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79 `coloredlogs` sticks to the eight color palette defined by the original ANSI |
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80 standard, in order to provide a somewhat consistent experience across terminals |
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81 and terminal emulators. |
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82 |
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83 Available text styles and colors |
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84 -------------------------------- |
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85 |
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86 Of course you are free to customize the default configuration, in this case you |
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87 can use any text style or color that you know is supported by your terminal. |
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88 You can use the ``humanfriendly --demo`` command to try out the supported text |
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89 styles and colors: |
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90 |
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91 .. image:: http://humanfriendly.readthedocs.io/en/latest/_images/ansi-demo.png |
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92 :alt: Screen shot of the 'humanfriendly --demo' command. |
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93 |
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94 Changing the log format |
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95 ----------------------- |
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96 |
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97 The simplest customization is to change the log format, for example: |
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98 |
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99 .. literalinclude:: examples/custom-log-format.txt |
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100 :language: console |
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101 |
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102 Here's what that looks like in a terminal (I always work in terminals with a |
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103 black background and white text): |
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104 |
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105 .. image:: images/custom-log-format.png |
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106 :alt: Screen shot of colored logging with custom log format. |
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107 |
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108 Changing the date/time format |
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109 ----------------------------- |
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110 |
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111 You can also change the date/time format, for example you can remove the date |
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112 part and leave only the time: |
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113 |
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114 .. literalinclude:: examples/custom-datetime-format.txt |
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115 :language: console |
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116 |
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117 Here's what it looks like in a terminal: |
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118 |
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119 .. image:: images/custom-datetime-format.png |
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120 :alt: Screen shot of colored logging with custom date/time format. |
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121 |
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122 Changing the colors/styles |
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123 -------------------------- |
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124 |
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125 Finally you can customize the colors and text styles that are used: |
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126 |
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127 .. literalinclude:: examples/custom-colors.txt |
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128 :language: console |
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129 |
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130 Here's an explanation of the features used here: |
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131 |
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132 - The numbers used in ``$COLOREDLOGS_LEVEL_STYLES`` demonstrate the use of 256 |
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133 color mode (the numbers refer to the 256 color mode palette which is fixed). |
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134 |
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135 - The `success` level demonstrates the use of a text style (bold). |
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136 |
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137 - The `critical` level demonstrates the use of a background color (red). |
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138 |
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139 Of course none of this can be seen in the shell transcript quoted above, but |
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140 take a look at the following screen shot: |
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141 |
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142 .. image:: images/custom-colors.png |
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143 :alt: Screen shot of colored logging with custom colors. |
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144 |
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145 .. _notes about log levels: |
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146 |
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147 Some notes about log levels |
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148 =========================== |
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149 |
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150 With regards to the handling of log levels, the :mod:`coloredlogs` package |
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151 differs from Python's :mod:`logging` module in two aspects: |
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152 |
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153 1. While the :mod:`logging` module uses the default logging level |
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154 :data:`logging.WARNING`, the :mod:`coloredlogs` package has always used |
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155 :data:`logging.INFO` as its default log level. |
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156 |
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157 2. When logging to the terminal or system log is initialized by |
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158 :func:`install()` or :func:`.enable_system_logging()` the effective |
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159 level [#]_ of the selected logger [#]_ is compared against the requested |
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160 level [#]_ and if the effective level is more restrictive than the requested |
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161 level, the logger's level will be set to the requested level (this happens |
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162 in :func:`adjust_level()`). The reason for this is to work around a |
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163 combination of design choices in Python's :mod:`logging` module that can |
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164 easily confuse people who aren't already intimately familiar with it: |
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165 |
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166 - All loggers are initialized with the level :data:`logging.NOTSET`. |
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167 |
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168 - When a logger's level is set to :data:`logging.NOTSET` the |
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169 :func:`~logging.Logger.getEffectiveLevel()` method will |
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170 fall back to the level of the parent logger. |
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171 |
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172 - The parent of all loggers is the root logger and the root logger has its |
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173 level set to :data:`logging.WARNING` by default (after importing the |
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174 :mod:`logging` module). |
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175 |
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176 Effectively all user defined loggers inherit the default log level |
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177 :data:`logging.WARNING` from the root logger, which isn't very intuitive for |
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178 those who aren't already familiar with the hierarchical nature of the |
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179 :mod:`logging` module. |
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180 |
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181 By avoiding this potentially confusing behavior (see `#14`_, `#18`_, `#21`_, |
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182 `#23`_ and `#24`_), while at the same time allowing the caller to specify a |
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183 logger object, my goal and hope is to provide sane defaults that can easily |
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184 be changed when the need arises. |
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185 |
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186 .. [#] Refer to :func:`logging.Logger.getEffectiveLevel()` for details. |
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187 .. [#] The logger that is passed as an argument by the caller or the root |
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188 logger which is selected as a default when no logger is provided. |
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189 .. [#] The log level that is passed as an argument by the caller or the |
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190 default log level :data:`logging.INFO` when no level is provided. |
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191 |
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192 .. _#14: https://github.com/xolox/python-coloredlogs/issues/14 |
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193 .. _#18: https://github.com/xolox/python-coloredlogs/issues/18 |
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194 .. _#21: https://github.com/xolox/python-coloredlogs/pull/21 |
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195 .. _#23: https://github.com/xolox/python-coloredlogs/pull/23 |
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196 .. _#24: https://github.com/xolox/python-coloredlogs/issues/24 |
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197 |
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198 Classes and functions |
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199 ===================== |
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200 """ |
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201 |
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202 # Standard library modules. |
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203 import collections |
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204 import logging |
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205 import os |
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206 import re |
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207 import socket |
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208 import sys |
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209 |
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210 # External dependencies. |
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211 from humanfriendly import coerce_boolean |
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212 from humanfriendly.compat import coerce_string, is_string, on_windows |
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213 from humanfriendly.terminal import ANSI_COLOR_CODES, ansi_wrap, enable_ansi_support, terminal_supports_colors |
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214 from humanfriendly.text import format, split |
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215 |
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216 # Semi-standard module versioning. |
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217 __version__ = '15.0' |
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218 |
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219 DEFAULT_LOG_LEVEL = logging.INFO |
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220 """The default log level for :mod:`coloredlogs` (:data:`logging.INFO`).""" |
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221 |
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222 DEFAULT_LOG_FORMAT = '%(asctime)s %(hostname)s %(name)s[%(process)d] %(levelname)s %(message)s' |
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223 """The default log format for :class:`ColoredFormatter` objects (a string).""" |
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224 |
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225 DEFAULT_DATE_FORMAT = '%Y-%m-%d %H:%M:%S' |
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226 """The default date/time format for :class:`ColoredFormatter` objects (a string).""" |
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227 |
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228 CHROOT_FILES = ['/etc/debian_chroot'] |
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229 """A list of filenames that indicate a chroot and contain the name of the chroot.""" |
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230 |
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231 DEFAULT_FIELD_STYLES = dict( |
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232 asctime=dict(color='green'), |
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233 hostname=dict(color='magenta'), |
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234 levelname=dict(color='black', bold=True), |
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235 name=dict(color='blue'), |
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236 programname=dict(color='cyan'), |
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237 username=dict(color='yellow'), |
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238 ) |
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239 """Mapping of log format names to default font styles.""" |
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240 |
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241 DEFAULT_LEVEL_STYLES = dict( |
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242 spam=dict(color='green', faint=True), |
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243 debug=dict(color='green'), |
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244 verbose=dict(color='blue'), |
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245 info=dict(), |
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246 notice=dict(color='magenta'), |
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247 warning=dict(color='yellow'), |
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248 success=dict(color='green', bold=True), |
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249 error=dict(color='red'), |
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250 critical=dict(color='red', bold=True), |
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251 ) |
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252 """Mapping of log level names to default font styles.""" |
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253 |
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254 DEFAULT_FORMAT_STYLE = '%' |
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255 """The default logging format style (a single character).""" |
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256 |
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257 FORMAT_STYLE_PATTERNS = { |
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258 '%': r'%\((\w+)\)[#0 +-]*\d*(?:\.\d+)?[hlL]?[diouxXeEfFgGcrs%]', |
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259 '{': r'{(\w+)[^}]*}', |
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260 '$': r'\$(\w+)|\${(\w+)}', |
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261 } |
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262 """ |
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263 A dictionary that maps the `style` characters ``%``, ``{`` and ``$`` (see the |
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264 documentation of the :class:`python3:logging.Formatter` class in Python 3.2+) |
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265 to strings containing regular expression patterns that can be used to parse |
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266 format strings in the corresponding style: |
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267 |
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268 ``%`` |
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269 A string containing a regular expression that matches a "percent conversion |
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270 specifier" as defined in the `String Formatting Operations`_ section of the |
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271 Python documentation. Here's an example of a logging format string in this |
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272 format: ``%(levelname)s:%(name)s:%(message)s``. |
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273 |
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274 ``{`` |
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275 A string containing a regular expression that matches a "replacement field" as |
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276 defined in the `Format String Syntax`_ section of the Python documentation. |
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277 Here's an example of a logging format string in this format: |
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278 ``{levelname}:{name}:{message}``. |
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279 |
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280 ``$`` |
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281 A string containing a regular expression that matches a "substitution |
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282 placeholder" as defined in the `Template Strings`_ section of the Python |
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283 documentation. Here's an example of a logging format string in this format: |
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284 ``$levelname:$name:$message``. |
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285 |
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286 These regular expressions are used by :class:`FormatStringParser` to introspect |
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287 and manipulate logging format strings. |
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288 |
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289 .. _String Formatting Operations: https://docs.python.org/2/library/stdtypes.html#string-formatting |
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290 .. _Format String Syntax: https://docs.python.org/2/library/string.html#formatstrings |
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291 .. _Template Strings: https://docs.python.org/3/library/string.html#template-strings |
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292 """ |
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293 |
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294 |
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295 def auto_install(): |
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296 """ |
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297 Automatically call :func:`install()` when ``$COLOREDLOGS_AUTO_INSTALL`` is set. |
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298 |
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299 The `coloredlogs` package includes a `path configuration file`_ that |
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300 automatically imports the :mod:`coloredlogs` module and calls |
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301 :func:`auto_install()` when the environment variable |
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302 ``$COLOREDLOGS_AUTO_INSTALL`` is set. |
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303 |
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304 This function uses :func:`~humanfriendly.coerce_boolean()` to check whether |
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305 the value of ``$COLOREDLOGS_AUTO_INSTALL`` should be considered :data:`True`. |
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306 |
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307 .. _path configuration file: https://docs.python.org/2/library/site.html#module-site |
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308 """ |
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309 if coerce_boolean(os.environ.get('COLOREDLOGS_AUTO_INSTALL', 'false')): |
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310 install() |
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311 |
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312 |
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313 def install(level=None, **kw): |
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314 """ |
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315 Enable colored terminal output for Python's :mod:`logging` module. |
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316 |
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317 :param level: The default logging level (an integer or a string with a |
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318 level name, defaults to :data:`DEFAULT_LOG_LEVEL`). |
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319 :param logger: The logger to which the stream handler should be attached (a |
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320 :class:`~logging.Logger` object, defaults to the root logger). |
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321 :param fmt: Set the logging format (a string like those accepted by |
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322 :class:`~logging.Formatter`, defaults to |
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323 :data:`DEFAULT_LOG_FORMAT`). |
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324 :param datefmt: Set the date/time format (a string, defaults to |
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325 :data:`DEFAULT_DATE_FORMAT`). |
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326 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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327 :data:`DEFAULT_FORMAT_STYLE`). See the documentation of the |
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328 :class:`python3:logging.Formatter` class in Python 3.2+. On |
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329 older Python versions only ``%`` is supported. |
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330 :param milliseconds: :data:`True` to show milliseconds like :mod:`logging` |
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331 does by default, :data:`False` to hide milliseconds |
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332 (the default is :data:`False`, see `#16`_). |
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333 :param level_styles: A dictionary with custom level styles (defaults to |
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334 :data:`DEFAULT_LEVEL_STYLES`). |
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335 :param field_styles: A dictionary with custom field styles (defaults to |
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336 :data:`DEFAULT_FIELD_STYLES`). |
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337 :param stream: The stream where log messages should be written to (a |
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338 file-like object). This defaults to :data:`None` which |
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339 means :class:`StandardErrorHandler` is used. |
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340 :param isatty: :data:`True` to use a :class:`ColoredFormatter`, |
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341 :data:`False` to use a normal :class:`~logging.Formatter` |
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342 (defaults to auto-detection using |
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343 :func:`~humanfriendly.terminal.terminal_supports_colors()`). |
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344 :param reconfigure: If :data:`True` (the default) multiple calls to |
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345 :func:`coloredlogs.install()` will each override |
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346 the previous configuration. |
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347 :param use_chroot: Refer to :class:`HostNameFilter`. |
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348 :param programname: Refer to :class:`ProgramNameFilter`. |
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349 :param username: Refer to :class:`UserNameFilter`. |
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350 :param syslog: If :data:`True` then :func:`.enable_system_logging()` will |
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351 be called without arguments (defaults to :data:`False`). The |
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352 `syslog` argument may also be a number or string, in this |
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353 case it is assumed to be a logging level which is passed on |
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354 to :func:`.enable_system_logging()`. |
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355 |
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356 The :func:`coloredlogs.install()` function is similar to |
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357 :func:`logging.basicConfig()`, both functions take a lot of optional |
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358 keyword arguments but try to do the right thing by default: |
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359 |
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360 1. If `reconfigure` is :data:`True` (it is by default) and an existing |
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361 :class:`~logging.StreamHandler` is found that is connected to either |
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362 :data:`~sys.stdout` or :data:`~sys.stderr` the handler will be removed. |
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363 This means that first calling :func:`logging.basicConfig()` and then |
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364 calling :func:`coloredlogs.install()` will replace the stream handler |
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365 instead of adding a duplicate stream handler. If `reconfigure` is |
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366 :data:`False` and an existing handler is found no further steps are |
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367 taken (to avoid installing a duplicate stream handler). |
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368 |
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369 2. A :class:`~logging.StreamHandler` is created and connected to the stream |
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370 given by the `stream` keyword argument (:data:`sys.stderr` by |
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371 default). The stream handler's level is set to the value of the `level` |
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372 keyword argument. |
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373 |
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374 3. A :class:`ColoredFormatter` is created if the `isatty` keyword argument |
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375 allows it (or auto-detection allows it), otherwise a normal |
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376 :class:`~logging.Formatter` is created. The formatter is initialized |
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377 with the `fmt` and `datefmt` keyword arguments (or their computed |
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378 defaults). |
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379 |
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380 The environment variable ``$NO_COLOR`` is taken as a hint by |
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381 auto-detection that colors should not be used. |
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382 |
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383 4. :func:`HostNameFilter.install()`, :func:`ProgramNameFilter.install()` |
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384 and :func:`UserNameFilter.install()` are called to enable the use of |
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385 additional fields in the log format. |
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386 |
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387 5. If the logger's level is too restrictive it is relaxed (refer to `notes |
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388 about log levels`_ for details). |
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389 |
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390 6. The formatter is added to the handler and the handler is added to the |
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391 logger. |
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392 |
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393 .. _#16: https://github.com/xolox/python-coloredlogs/issues/16 |
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394 """ |
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395 logger = kw.get('logger') or logging.getLogger() |
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396 reconfigure = kw.get('reconfigure', True) |
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397 stream = kw.get('stream', sys.stderr) |
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398 style = check_style(kw.get('style') or DEFAULT_FORMAT_STYLE) |
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399 # Get the log level from an argument, environment variable or default and |
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400 # convert the names of log levels to numbers to enable numeric comparison. |
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401 if level is None: |
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402 level = os.environ.get('COLOREDLOGS_LOG_LEVEL', DEFAULT_LOG_LEVEL) |
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403 level = level_to_number(level) |
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404 # Remove any existing stream handler that writes to stdout or stderr, even |
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405 # if the stream handler wasn't created by coloredlogs because multiple |
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406 # stream handlers (in the same hierarchy) writing to stdout or stderr would |
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407 # create duplicate output. `None' is a synonym for the possibly dynamic |
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408 # value of the stderr attribute of the sys module. |
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409 match_streams = ([sys.stdout, sys.stderr] |
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410 if stream in [sys.stdout, sys.stderr, None] |
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411 else [stream]) |
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412 match_handler = lambda handler: match_stream_handler(handler, match_streams) |
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413 handler, logger = replace_handler(logger, match_handler, reconfigure) |
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414 # Make sure reconfiguration is allowed or not relevant. |
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415 if not (handler and not reconfigure): |
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416 # Make it easy to enable system logging. |
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417 syslog_enabled = kw.get('syslog') |
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418 # We ignore the value `None' because it means the caller didn't opt in |
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419 # to system logging and `False' because it means the caller explicitly |
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420 # opted out of system logging. |
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421 if syslog_enabled not in (None, False): |
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422 from coloredlogs.syslog import enable_system_logging |
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423 if syslog_enabled is True: |
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424 # If the caller passed syslog=True then we leave the choice of |
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425 # default log level up to the coloredlogs.syslog module. |
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426 enable_system_logging() |
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427 else: |
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428 # Values other than (None, True, False) are assumed to |
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429 # represent a logging level for system logging. |
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430 enable_system_logging(level=syslog_enabled) |
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431 # Figure out whether we can use ANSI escape sequences. |
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432 use_colors = kw.get('isatty', None) |
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433 # In the following indented block the expression (use_colors is None) |
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434 # can be read as "auto detect is enabled and no reason has yet been |
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435 # found to automatically disable color support". |
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436 if use_colors or (use_colors is None): |
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437 # Respect the user's choice not to have colors. |
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438 if use_colors is None and 'NO_COLOR' in os.environ: |
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439 # For details on this see https://no-color.org/. |
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440 use_colors = False |
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441 # Try to enable Windows native ANSI support or Colorama? |
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442 if (use_colors or use_colors is None) and on_windows(): |
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443 # This can fail, in which case ANSI escape sequences would end |
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444 # up being printed to the terminal in raw form. This is very |
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445 # user hostile, so to avoid this happening we disable color |
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446 # support on failure. |
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447 use_colors = enable_ansi_support() |
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448 # When auto detection is enabled, and so far we encountered no |
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449 # reason to disable color support, then we will enable color |
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450 # support if 'stream' is connected to a terminal. |
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451 if use_colors is None: |
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452 use_colors = terminal_supports_colors(stream) |
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453 # Create a stream handler and make sure to preserve any filters |
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454 # the current handler may have (if an existing handler is found). |
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455 filters = handler.filters if handler else None |
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456 handler = logging.StreamHandler(stream) if stream else StandardErrorHandler() |
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457 handler.setLevel(level) |
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458 if filters: |
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459 handler.filters = filters |
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460 # Prepare the arguments to the formatter, allowing the caller to |
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461 # customize the values of `fmt', `datefmt' and `style' as desired. |
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462 formatter_options = dict(fmt=kw.get('fmt'), datefmt=kw.get('datefmt')) |
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463 # Only pass the `style' argument to the formatter when the caller |
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464 # provided an alternative logging format style. This prevents |
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465 # TypeError exceptions on Python versions before 3.2. |
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466 if style != DEFAULT_FORMAT_STYLE: |
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467 formatter_options['style'] = style |
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468 # Come up with a default log format? |
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469 if not formatter_options['fmt']: |
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470 # Use the log format defined by the environment variable |
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471 # $COLOREDLOGS_LOG_FORMAT or fall back to the default. |
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472 formatter_options['fmt'] = os.environ.get('COLOREDLOGS_LOG_FORMAT') or DEFAULT_LOG_FORMAT |
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473 # If the caller didn't specify a date/time format we'll use the format |
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474 # defined by the environment variable $COLOREDLOGS_DATE_FORMAT (or fall |
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475 # back to the default). |
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476 if not formatter_options['datefmt']: |
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477 formatter_options['datefmt'] = os.environ.get('COLOREDLOGS_DATE_FORMAT') or DEFAULT_DATE_FORMAT |
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478 # Python's logging module shows milliseconds by default through special |
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479 # handling in the logging.Formatter.formatTime() method [1]. Because |
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480 # coloredlogs always defines a `datefmt' it bypasses this special |
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481 # handling, which is fine because ever since publishing coloredlogs |
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482 # I've never needed millisecond precision ;-). However there are users |
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483 # of coloredlogs that do want milliseconds to be shown [2] so we |
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484 # provide a shortcut to make it easy. |
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485 # |
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486 # [1] https://stackoverflow.com/questions/6290739/python-logging-use-milliseconds-in-time-format |
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487 # [2] https://github.com/xolox/python-coloredlogs/issues/16 |
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488 if kw.get('milliseconds'): |
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489 parser = FormatStringParser(style=style) |
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490 if not (parser.contains_field(formatter_options['fmt'], 'msecs') |
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491 or '%f' in formatter_options['datefmt']): |
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492 pattern = parser.get_pattern('asctime') |
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493 replacements = {'%': '%(msecs)03d', '{': '{msecs:03}', '$': '${msecs}'} |
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494 formatter_options['fmt'] = pattern.sub( |
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495 r'\g<0>,' + replacements[style], |
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496 formatter_options['fmt'], |
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497 ) |
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498 # Do we need to make %(hostname) available to the formatter? |
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499 HostNameFilter.install( |
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500 fmt=formatter_options['fmt'], |
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501 handler=handler, |
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502 style=style, |
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503 use_chroot=kw.get('use_chroot', True), |
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504 ) |
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505 # Do we need to make %(programname) available to the formatter? |
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506 ProgramNameFilter.install( |
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507 fmt=formatter_options['fmt'], |
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508 handler=handler, |
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509 programname=kw.get('programname'), |
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510 style=style, |
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511 ) |
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512 # Do we need to make %(username) available to the formatter? |
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513 UserNameFilter.install( |
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514 fmt=formatter_options['fmt'], |
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515 handler=handler, |
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516 username=kw.get('username'), |
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517 style=style, |
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518 ) |
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519 # Inject additional formatter arguments specific to ColoredFormatter? |
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520 if use_colors: |
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521 for name, environment_name in (('field_styles', 'COLOREDLOGS_FIELD_STYLES'), |
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522 ('level_styles', 'COLOREDLOGS_LEVEL_STYLES')): |
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523 value = kw.get(name) |
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524 if value is None: |
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525 # If no styles have been specified we'll fall back |
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526 # to the styles defined by the environment variable. |
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527 environment_value = os.environ.get(environment_name) |
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528 if environment_value is not None: |
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529 value = parse_encoded_styles(environment_value) |
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530 if value is not None: |
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531 formatter_options[name] = value |
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532 # Create a (possibly colored) formatter. |
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533 formatter_type = ColoredFormatter if use_colors else BasicFormatter |
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534 handler.setFormatter(formatter_type(**formatter_options)) |
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535 # Adjust the level of the selected logger. |
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536 adjust_level(logger, level) |
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537 # Install the stream handler. |
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538 logger.addHandler(handler) |
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539 |
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540 |
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541 def check_style(value): |
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542 """ |
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543 Validate a logging format style. |
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544 |
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545 :param value: The logging format style to validate (any value). |
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546 :returns: The logging format character (a string of one character). |
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547 :raises: :exc:`~exceptions.ValueError` when the given style isn't supported. |
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548 |
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549 On Python 3.2+ this function accepts the logging format styles ``%``, ``{`` |
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550 and ``$`` while on older versions only ``%`` is accepted (because older |
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551 Python versions don't support alternative logging format styles). |
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552 """ |
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553 if sys.version_info[:2] >= (3, 2): |
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554 if value not in FORMAT_STYLE_PATTERNS: |
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555 msg = "Unsupported logging format style! (%r)" |
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556 raise ValueError(format(msg, value)) |
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557 elif value != DEFAULT_FORMAT_STYLE: |
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558 msg = "Format string styles other than %r require Python 3.2+!" |
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559 raise ValueError(msg, DEFAULT_FORMAT_STYLE) |
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560 return value |
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561 |
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562 |
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563 def increase_verbosity(): |
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564 """ |
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565 Increase the verbosity of the root handler by one defined level. |
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566 |
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567 Understands custom logging levels like defined by my ``verboselogs`` |
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568 module. |
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569 """ |
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570 defined_levels = sorted(set(find_defined_levels().values())) |
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571 current_index = defined_levels.index(get_level()) |
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572 selected_index = max(0, current_index - 1) |
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573 set_level(defined_levels[selected_index]) |
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574 |
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575 |
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576 def decrease_verbosity(): |
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577 """ |
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578 Decrease the verbosity of the root handler by one defined level. |
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579 |
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580 Understands custom logging levels like defined by my ``verboselogs`` |
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581 module. |
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582 """ |
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583 defined_levels = sorted(set(find_defined_levels().values())) |
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584 current_index = defined_levels.index(get_level()) |
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585 selected_index = min(current_index + 1, len(defined_levels) - 1) |
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586 set_level(defined_levels[selected_index]) |
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587 |
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588 |
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589 def is_verbose(): |
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590 """ |
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591 Check whether the log level of the root handler is set to a verbose level. |
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592 |
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593 :returns: ``True`` if the root handler is verbose, ``False`` if not. |
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594 """ |
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595 return get_level() < DEFAULT_LOG_LEVEL |
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596 |
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597 |
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598 def get_level(): |
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599 """ |
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600 Get the logging level of the root handler. |
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601 |
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602 :returns: The logging level of the root handler (an integer) or |
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603 :data:`DEFAULT_LOG_LEVEL` (if no root handler exists). |
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604 """ |
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605 handler, logger = find_handler(logging.getLogger(), match_stream_handler) |
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606 return handler.level if handler else DEFAULT_LOG_LEVEL |
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607 |
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608 |
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609 def set_level(level): |
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610 """ |
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611 Set the logging level of the root handler. |
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612 |
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613 :param level: The logging level to filter on (an integer or string). |
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614 |
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615 If no root handler exists yet this automatically calls :func:`install()`. |
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616 """ |
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617 handler, logger = find_handler(logging.getLogger(), match_stream_handler) |
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618 if handler and logger: |
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619 # Change the level of the existing handler. |
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620 handler.setLevel(level_to_number(level)) |
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621 # Adjust the level of the selected logger. |
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622 adjust_level(logger, level) |
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623 else: |
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624 # Create a new handler with the given level. |
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625 install(level=level) |
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626 |
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627 |
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628 def adjust_level(logger, level): |
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629 """ |
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630 Increase a logger's verbosity up to the requested level. |
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631 |
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632 :param logger: The logger to change (a :class:`~logging.Logger` object). |
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633 :param level: The log level to enable (a string or number). |
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634 |
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635 This function is used by functions like :func:`install()`, |
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636 :func:`increase_verbosity()` and :func:`.enable_system_logging()` to adjust |
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637 a logger's level so that log messages up to the requested log level are |
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638 propagated to the configured output handler(s). |
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639 |
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640 It uses :func:`logging.Logger.getEffectiveLevel()` to check whether |
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641 `logger` propagates or swallows log messages of the requested `level` and |
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642 sets the logger's level to the requested level if it would otherwise |
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643 swallow log messages. |
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644 |
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645 Effectively this function will "widen the scope of logging" when asked to |
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646 do so but it will never "narrow the scope of logging". This is because I am |
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647 convinced that filtering of log messages should (primarily) be decided by |
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648 handlers. |
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649 """ |
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650 level = level_to_number(level) |
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651 if logger.getEffectiveLevel() > level: |
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652 logger.setLevel(level) |
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653 |
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654 |
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655 def find_defined_levels(): |
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656 """ |
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657 Find the defined logging levels. |
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658 |
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659 :returns: A dictionary with level names as keys and integers as values. |
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660 |
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661 Here's what the result looks like by default (when |
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662 no custom levels or level names have been defined): |
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663 |
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664 >>> find_defined_levels() |
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665 {'NOTSET': 0, |
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666 'DEBUG': 10, |
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667 'INFO': 20, |
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668 'WARN': 30, |
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669 'WARNING': 30, |
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670 'ERROR': 40, |
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671 'FATAL': 50, |
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672 'CRITICAL': 50} |
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673 """ |
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674 defined_levels = {} |
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675 for name in dir(logging): |
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676 if name.isupper(): |
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677 value = getattr(logging, name) |
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678 if isinstance(value, int): |
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679 defined_levels[name] = value |
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680 return defined_levels |
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681 |
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682 |
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683 def level_to_number(value): |
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684 """ |
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685 Coerce a logging level name to a number. |
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686 |
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687 :param value: A logging level (integer or string). |
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688 :returns: The number of the log level (an integer). |
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689 |
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690 This function translates log level names into their numeric values.. |
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691 """ |
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692 if is_string(value): |
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693 try: |
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694 defined_levels = find_defined_levels() |
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695 value = defined_levels[value.upper()] |
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696 except KeyError: |
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697 # Don't fail on unsupported log levels. |
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698 value = DEFAULT_LOG_LEVEL |
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699 return value |
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700 |
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701 |
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702 def find_level_aliases(): |
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703 """ |
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704 Find log level names which are aliases of each other. |
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705 |
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706 :returns: A dictionary that maps aliases to their canonical name. |
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707 |
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708 .. note:: Canonical names are chosen to be the alias with the longest |
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709 string length so that e.g. ``WARN`` is an alias for ``WARNING`` |
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710 instead of the other way around. |
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711 |
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712 Here's what the result looks like by default (when |
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713 no custom levels or level names have been defined): |
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714 |
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715 >>> from coloredlogs import find_level_aliases |
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716 >>> find_level_aliases() |
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717 {'WARN': 'WARNING', 'FATAL': 'CRITICAL'} |
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718 """ |
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719 mapping = collections.defaultdict(list) |
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720 for name, value in find_defined_levels().items(): |
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721 mapping[value].append(name) |
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722 aliases = {} |
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723 for value, names in mapping.items(): |
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724 if len(names) > 1: |
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725 names = sorted(names, key=lambda n: len(n)) |
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726 canonical_name = names.pop() |
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727 for alias in names: |
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728 aliases[alias] = canonical_name |
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729 return aliases |
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730 |
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731 |
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732 def parse_encoded_styles(text, normalize_key=None): |
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733 """ |
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734 Parse text styles encoded in a string into a nested data structure. |
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735 |
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736 :param text: The encoded styles (a string). |
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737 :returns: A dictionary in the structure of the :data:`DEFAULT_FIELD_STYLES` |
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738 and :data:`DEFAULT_LEVEL_STYLES` dictionaries. |
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739 |
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740 Here's an example of how this function works: |
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741 |
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742 >>> from coloredlogs import parse_encoded_styles |
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743 >>> from pprint import pprint |
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744 >>> encoded_styles = 'debug=green;warning=yellow;error=red;critical=red,bold' |
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745 >>> pprint(parse_encoded_styles(encoded_styles)) |
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746 {'debug': {'color': 'green'}, |
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747 'warning': {'color': 'yellow'}, |
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748 'error': {'color': 'red'}, |
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749 'critical': {'bold': True, 'color': 'red'}} |
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750 """ |
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751 parsed_styles = {} |
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752 for assignment in split(text, ';'): |
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753 name, _, styles = assignment.partition('=') |
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754 target = parsed_styles.setdefault(name, {}) |
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755 for token in split(styles, ','): |
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756 # When this code was originally written, setting background colors |
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757 # wasn't supported yet, so there was no need to disambiguate |
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758 # between the text color and background color. This explains why |
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759 # a color name or number implies setting the text color (for |
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760 # backwards compatibility). |
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761 if token.isdigit(): |
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762 target['color'] = int(token) |
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763 elif token in ANSI_COLOR_CODES: |
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764 target['color'] = token |
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765 elif '=' in token: |
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766 name, _, value = token.partition('=') |
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767 if name in ('color', 'background'): |
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768 if value.isdigit(): |
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769 target[name] = int(value) |
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770 elif value in ANSI_COLOR_CODES: |
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771 target[name] = value |
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772 else: |
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773 target[token] = True |
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774 return parsed_styles |
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775 |
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776 |
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777 def find_hostname(use_chroot=True): |
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778 """ |
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779 Find the host name to include in log messages. |
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780 |
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781 :param use_chroot: Use the name of the chroot when inside a chroot? |
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782 (boolean, defaults to :data:`True`) |
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783 :returns: A suitable host name (a string). |
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784 |
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785 Looks for :data:`CHROOT_FILES` that have a nonempty first line (taken to be |
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786 the chroot name). If none are found then :func:`socket.gethostname()` is |
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787 used as a fall back. |
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788 """ |
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789 for chroot_file in CHROOT_FILES: |
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790 try: |
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791 with open(chroot_file) as handle: |
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792 first_line = next(handle) |
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793 name = first_line.strip() |
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794 if name: |
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795 return name |
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796 except Exception: |
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797 pass |
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798 return socket.gethostname() |
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799 |
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800 |
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801 def find_program_name(): |
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802 """ |
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803 Select a suitable program name to embed in log messages. |
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804 |
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805 :returns: One of the following strings (in decreasing order of preference): |
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806 |
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807 1. The base name of the currently running Python program or |
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808 script (based on the value at index zero of :data:`sys.argv`). |
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809 2. The base name of the Python executable (based on |
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810 :data:`sys.executable`). |
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811 3. The string 'python'. |
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812 """ |
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813 # Gotcha: sys.argv[0] is '-c' if Python is started with the -c option. |
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814 return ((os.path.basename(sys.argv[0]) if sys.argv and sys.argv[0] != '-c' else '') |
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815 or (os.path.basename(sys.executable) if sys.executable else '') |
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816 or 'python') |
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817 |
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818 |
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819 def find_username(): |
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820 """ |
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821 Find the username to include in log messages. |
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822 |
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823 :returns: A suitable username (a string). |
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824 |
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825 On UNIX systems this uses the :mod:`pwd` module which means ``root`` will |
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826 be reported when :man:`sudo` is used (as it should). If this fails (for |
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827 example on Windows) then :func:`getpass.getuser()` is used as a fall back. |
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828 """ |
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829 try: |
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830 import pwd |
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831 uid = os.getuid() |
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832 entry = pwd.getpwuid(uid) |
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833 return entry.pw_name |
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834 except Exception: |
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835 import getpass |
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836 return getpass.getuser() |
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837 |
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838 |
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839 def replace_handler(logger, match_handler, reconfigure): |
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840 """ |
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841 Prepare to replace a handler. |
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842 |
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843 :param logger: Refer to :func:`find_handler()`. |
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844 :param match_handler: Refer to :func:`find_handler()`. |
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845 :param reconfigure: :data:`True` if an existing handler should be replaced, |
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846 :data:`False` otherwise. |
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847 :returns: A tuple of two values: |
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848 |
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849 1. The matched :class:`~logging.Handler` object or :data:`None` |
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850 if no handler was matched. |
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851 2. The :class:`~logging.Logger` to which the matched handler was |
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852 attached or the logger given to :func:`replace_handler()`. |
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853 """ |
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854 handler, other_logger = find_handler(logger, match_handler) |
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855 if handler and other_logger and reconfigure: |
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856 # Remove the existing handler from the logger that its attached to |
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857 # so that we can install a new handler that behaves differently. |
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858 other_logger.removeHandler(handler) |
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859 # Switch to the logger that the existing handler was attached to so |
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860 # that reconfiguration doesn't narrow the scope of logging. |
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861 logger = other_logger |
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862 return handler, logger |
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863 |
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864 |
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865 def find_handler(logger, match_handler): |
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866 """ |
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867 Find a (specific type of) handler in the propagation tree of a logger. |
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868 |
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869 :param logger: The logger to check (a :class:`~logging.Logger` object). |
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870 :param match_handler: A callable that receives a :class:`~logging.Handler` |
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871 object and returns :data:`True` to match a handler or |
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872 :data:`False` to skip that handler and continue |
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873 searching for a match. |
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874 :returns: A tuple of two values: |
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875 |
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876 1. The matched :class:`~logging.Handler` object or :data:`None` |
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877 if no handler was matched. |
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878 2. The :class:`~logging.Logger` object to which the handler is |
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879 attached or :data:`None` if no handler was matched. |
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880 |
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881 This function finds a logging handler (of the given type) attached to a |
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882 logger or one of its parents (see :func:`walk_propagation_tree()`). It uses |
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883 the undocumented :class:`~logging.Logger.handlers` attribute to find |
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884 handlers attached to a logger, however it won't raise an exception if the |
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885 attribute isn't available. The advantages of this approach are: |
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886 |
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887 - This works regardless of whether :mod:`coloredlogs` attached the handler |
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888 or other Python code attached the handler. |
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889 |
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890 - This will correctly recognize the situation where the given logger has no |
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891 handlers but :attr:`~logging.Logger.propagate` is enabled and the logger |
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892 has a parent logger that does have a handler attached. |
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893 """ |
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894 for logger in walk_propagation_tree(logger): |
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895 for handler in getattr(logger, 'handlers', []): |
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896 if match_handler(handler): |
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897 return handler, logger |
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898 return None, None |
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899 |
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900 |
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901 def match_stream_handler(handler, streams=[]): |
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902 """ |
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903 Identify stream handlers writing to the given streams(s). |
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904 |
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905 :param handler: The :class:`~logging.Handler` class to check. |
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906 :param streams: A sequence of streams to match (defaults to matching |
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907 :data:`~sys.stdout` and :data:`~sys.stderr`). |
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908 :returns: :data:`True` if the handler is a :class:`~logging.StreamHandler` |
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909 logging to the given stream(s), :data:`False` otherwise. |
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910 |
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911 This function can be used as a callback for :func:`find_handler()`. |
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912 """ |
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913 return (isinstance(handler, logging.StreamHandler) |
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914 and getattr(handler, 'stream') in (streams or (sys.stdout, sys.stderr))) |
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915 |
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916 |
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917 def walk_propagation_tree(logger): |
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918 """ |
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919 Walk through the propagation hierarchy of the given logger. |
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920 |
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921 :param logger: The logger whose hierarchy to walk (a |
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922 :class:`~logging.Logger` object). |
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923 :returns: A generator of :class:`~logging.Logger` objects. |
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924 |
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925 .. note:: This uses the undocumented :class:`logging.Logger.parent` |
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926 attribute to find higher level loggers, however it won't |
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927 raise an exception if the attribute isn't available. |
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928 """ |
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929 while isinstance(logger, logging.Logger): |
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930 # Yield the logger to our caller. |
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931 yield logger |
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932 # Check if the logger has propagation enabled. |
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933 if logger.propagate: |
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934 # Continue with the parent logger. We use getattr() because the |
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935 # `parent' attribute isn't documented so properly speaking we |
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936 # shouldn't break if it's not available. |
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937 logger = getattr(logger, 'parent', None) |
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938 else: |
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939 # The propagation chain stops here. |
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940 logger = None |
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941 |
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942 |
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943 class BasicFormatter(logging.Formatter): |
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944 |
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945 """ |
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946 Log :class:`~logging.Formatter` that supports ``%f`` for millisecond formatting. |
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947 |
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948 This class extends :class:`~logging.Formatter` to enable the use of ``%f`` |
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949 for millisecond formatting in date/time strings, to allow for the type of |
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950 flexibility requested in issue `#45`_. |
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951 |
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952 .. _#45: https://github.com/xolox/python-coloredlogs/issues/45 |
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953 """ |
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954 |
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955 def formatTime(self, record, datefmt=None): |
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956 """ |
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957 Format the date/time of a log record. |
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958 |
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959 :param record: A :class:`~logging.LogRecord` object. |
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960 :param datefmt: A date/time format string (defaults to :data:`DEFAULT_DATE_FORMAT`). |
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961 :returns: The formatted date/time (a string). |
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962 |
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963 This method overrides :func:`~logging.Formatter.formatTime()` to set |
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964 `datefmt` to :data:`DEFAULT_DATE_FORMAT` when the caller hasn't |
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965 specified a date format. |
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966 |
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967 When `datefmt` contains the token ``%f`` it will be replaced by the |
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968 value of ``%(msecs)03d`` (refer to issue `#45`_ for use cases). |
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969 """ |
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970 # The default value of the following argument is defined here so |
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971 # that Sphinx doesn't embed the default value in the generated |
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972 # documentation (because the result is awkward to read). |
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973 datefmt = datefmt or DEFAULT_DATE_FORMAT |
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974 # Replace %f with the value of %(msecs)03d. |
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975 if '%f' in datefmt: |
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976 datefmt = datefmt.replace('%f', '%03d' % record.msecs) |
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977 # Delegate the actual date/time formatting to the base formatter. |
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978 return logging.Formatter.formatTime(self, record, datefmt) |
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979 |
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980 |
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981 class ColoredFormatter(BasicFormatter): |
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982 |
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983 """ |
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984 Log :class:`~logging.Formatter` that uses `ANSI escape sequences`_ to create colored logs. |
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985 |
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986 :class:`ColoredFormatter` inherits from :class:`BasicFormatter` to enable |
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987 the use of ``%f`` for millisecond formatting in date/time strings. |
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988 |
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989 .. note:: If you want to use :class:`ColoredFormatter` on Windows then you |
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990 need to call :func:`~humanfriendly.terminal.enable_ansi_support()`. |
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991 This is done for you when you call :func:`coloredlogs.install()`. |
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992 """ |
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993 |
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994 def __init__(self, fmt=None, datefmt=None, style=DEFAULT_FORMAT_STYLE, level_styles=None, field_styles=None): |
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995 """ |
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996 Initialize a :class:`ColoredFormatter` object. |
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997 |
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998 :param fmt: A log format string (defaults to :data:`DEFAULT_LOG_FORMAT`). |
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999 :param datefmt: A date/time format string (defaults to :data:`None`, |
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1000 but see the documentation of |
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1001 :func:`BasicFormatter.formatTime()`). |
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1002 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1003 :data:`DEFAULT_FORMAT_STYLE`) |
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1004 :param level_styles: A dictionary with custom level styles |
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1005 (defaults to :data:`DEFAULT_LEVEL_STYLES`). |
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1006 :param field_styles: A dictionary with custom field styles |
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1007 (defaults to :data:`DEFAULT_FIELD_STYLES`). |
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1008 :raises: Refer to :func:`check_style()`. |
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1009 |
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1010 This initializer uses :func:`colorize_format()` to inject ANSI escape |
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1011 sequences in the log format string before it is passed to the |
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1012 initializer of the base class. |
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1013 """ |
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1014 self.nn = NameNormalizer() |
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1015 # The default values of the following arguments are defined here so |
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1016 # that Sphinx doesn't embed the default values in the generated |
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1017 # documentation (because the result is awkward to read). |
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1018 fmt = fmt or DEFAULT_LOG_FORMAT |
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1019 self.level_styles = self.nn.normalize_keys(DEFAULT_LEVEL_STYLES if level_styles is None else level_styles) |
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1020 self.field_styles = self.nn.normalize_keys(DEFAULT_FIELD_STYLES if field_styles is None else field_styles) |
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1021 # Rewrite the format string to inject ANSI escape sequences. |
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1022 kw = dict(fmt=self.colorize_format(fmt, style), datefmt=datefmt) |
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1023 # If we were given a non-default logging format style we pass it on |
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1024 # to our superclass. At this point check_style() will have already |
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1025 # complained that the use of alternative logging format styles |
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1026 # requires Python 3.2 or newer. |
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1027 if style != DEFAULT_FORMAT_STYLE: |
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1028 kw['style'] = style |
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1029 # Initialize the superclass with the rewritten format string. |
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1030 logging.Formatter.__init__(self, **kw) |
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1031 |
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1032 def colorize_format(self, fmt, style=DEFAULT_FORMAT_STYLE): |
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1033 """ |
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1034 Rewrite a logging format string to inject ANSI escape sequences. |
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1035 |
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1036 :param fmt: The log format string. |
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1037 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1038 :data:`DEFAULT_FORMAT_STYLE`). |
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1039 :returns: The logging format string with ANSI escape sequences. |
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1040 |
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1041 This method takes a logging format string like the ones you give to |
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1042 :class:`logging.Formatter` and processes it as follows: |
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1043 |
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1044 1. First the logging format string is separated into formatting |
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1045 directives versus surrounding text (according to the given `style`). |
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1046 |
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1047 2. Then formatting directives and surrounding text are grouped |
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1048 based on whitespace delimiters (in the surrounding text). |
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1049 |
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1050 3. For each group styling is selected as follows: |
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1051 |
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1052 1. If the group contains a single formatting directive that has |
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1053 a style defined then the whole group is styled accordingly. |
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1054 |
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1055 2. If the group contains multiple formatting directives that |
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1056 have styles defined then each formatting directive is styled |
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1057 individually and surrounding text isn't styled. |
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1058 |
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1059 As an example consider the default log format (:data:`DEFAULT_LOG_FORMAT`):: |
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1060 |
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1061 %(asctime)s %(hostname)s %(name)s[%(process)d] %(levelname)s %(message)s |
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1062 |
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1063 The default field styles (:data:`DEFAULT_FIELD_STYLES`) define a style for the |
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1064 `name` field but not for the `process` field, however because both fields |
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1065 are part of the same whitespace delimited token they'll be highlighted |
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1066 together in the style defined for the `name` field. |
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1067 """ |
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1068 result = [] |
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1069 parser = FormatStringParser(style=style) |
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1070 for group in parser.get_grouped_pairs(fmt): |
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1071 applicable_styles = [self.nn.get(self.field_styles, token.name) for token in group if token.name] |
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1072 if sum(map(bool, applicable_styles)) == 1: |
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1073 # If exactly one (1) field style is available for the group of |
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1074 # tokens then all of the tokens will be styled the same way. |
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1075 # This provides a limited form of backwards compatibility with |
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1076 # the (intended) behavior of coloredlogs before the release of |
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1077 # version 10. |
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1078 result.append(ansi_wrap( |
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1079 ''.join(token.text for token in group), |
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1080 **next(s for s in applicable_styles if s) |
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1081 )) |
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1082 else: |
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1083 for token in group: |
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1084 text = token.text |
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1085 if token.name: |
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1086 field_styles = self.nn.get(self.field_styles, token.name) |
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1087 if field_styles: |
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1088 text = ansi_wrap(text, **field_styles) |
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1089 result.append(text) |
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1090 return ''.join(result) |
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1091 |
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1092 def format(self, record): |
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1093 """ |
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1094 Apply level-specific styling to log records. |
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1095 |
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1096 :param record: A :class:`~logging.LogRecord` object. |
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1097 :returns: The result of :func:`logging.Formatter.format()`. |
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1098 |
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1099 This method injects ANSI escape sequences that are specific to the |
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1100 level of each log record (because such logic cannot be expressed in the |
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1101 syntax of a log format string). It works by making a copy of the log |
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1102 record, changing the `msg` field inside the copy and passing the copy |
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1103 into the :func:`~logging.Formatter.format()` method of the base |
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1104 class. |
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1105 """ |
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1106 style = self.nn.get(self.level_styles, record.levelname) |
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1107 # After the introduction of the `Empty' class it was reported in issue |
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1108 # 33 that format() can be called when `Empty' has already been garbage |
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1109 # collected. This explains the (otherwise rather out of place) `Empty |
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1110 # is not None' check in the following `if' statement. The reasoning |
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1111 # here is that it's much better to log a message without formatting |
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1112 # then to raise an exception ;-). |
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1113 # |
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1114 # For more details refer to issue 33 on GitHub: |
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1115 # https://github.com/xolox/python-coloredlogs/issues/33 |
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1116 if style and Empty is not None: |
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1117 # Due to the way that Python's logging module is structured and |
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1118 # documented the only (IMHO) clean way to customize its behavior is |
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1119 # to change incoming LogRecord objects before they get to the base |
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1120 # formatter. However we don't want to break other formatters and |
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1121 # handlers, so we copy the log record. |
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1122 # |
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1123 # In the past this used copy.copy() but as reported in issue 29 |
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1124 # (which is reproducible) this can cause deadlocks. The following |
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1125 # Python voodoo is intended to accomplish the same thing as |
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1126 # copy.copy() without all of the generalization and overhead that |
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1127 # we don't need for our -very limited- use case. |
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1128 # |
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1129 # For more details refer to issue 29 on GitHub: |
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1130 # https://github.com/xolox/python-coloredlogs/issues/29 |
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1131 copy = Empty() |
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1132 copy.__class__ = record.__class__ |
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1133 copy.__dict__.update(record.__dict__) |
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1134 copy.msg = ansi_wrap(coerce_string(record.msg), **style) |
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1135 record = copy |
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1136 # Delegate the remaining formatting to the base formatter. |
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1137 return logging.Formatter.format(self, record) |
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1138 |
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1139 |
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1140 class Empty(object): |
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1141 """An empty class used to copy :class:`~logging.LogRecord` objects without reinitializing them.""" |
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1142 |
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1143 |
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1144 class HostNameFilter(logging.Filter): |
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1145 |
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1146 """ |
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1147 Log filter to enable the ``%(hostname)s`` format. |
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1148 |
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1149 Python's :mod:`logging` module doesn't expose the system's host name while |
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1150 I consider this to be a valuable addition. Fortunately it's very easy to |
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1151 expose additional fields in format strings: :func:`filter()` simply sets |
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1152 the ``hostname`` attribute of each :class:`~logging.LogRecord` object it |
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1153 receives and this is enough to enable the use of the ``%(hostname)s`` |
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1154 expression in format strings. |
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1155 |
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1156 You can install this log filter as follows:: |
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1157 |
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1158 >>> import coloredlogs, logging |
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1159 >>> handler = logging.StreamHandler() |
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1160 >>> handler.addFilter(coloredlogs.HostNameFilter()) |
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1161 >>> handler.setFormatter(logging.Formatter('[%(hostname)s] %(message)s')) |
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1162 >>> logger = logging.getLogger() |
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1163 >>> logger.addHandler(handler) |
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1164 >>> logger.setLevel(logging.INFO) |
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1165 >>> logger.info("Does it work?") |
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1166 [peter-macbook] Does it work? |
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1167 |
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1168 Of course :func:`coloredlogs.install()` does all of this for you :-). |
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1169 """ |
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1170 |
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1171 @classmethod |
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1172 def install(cls, handler, fmt=None, use_chroot=True, style=DEFAULT_FORMAT_STYLE): |
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1173 """ |
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1174 Install the :class:`HostNameFilter` on a log handler (only if needed). |
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1175 |
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1176 :param fmt: The log format string to check for ``%(hostname)``. |
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1177 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1178 :data:`DEFAULT_FORMAT_STYLE`). |
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1179 :param handler: The logging handler on which to install the filter. |
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1180 :param use_chroot: Refer to :func:`find_hostname()`. |
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1181 |
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1182 If `fmt` is given the filter will only be installed if `fmt` uses the |
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1183 ``hostname`` field. If `fmt` is not given the filter is installed |
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1184 unconditionally. |
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1185 """ |
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1186 if fmt: |
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1187 parser = FormatStringParser(style=style) |
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1188 if not parser.contains_field(fmt, 'hostname'): |
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1189 return |
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1190 handler.addFilter(cls(use_chroot)) |
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1191 |
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1192 def __init__(self, use_chroot=True): |
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1193 """ |
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1194 Initialize a :class:`HostNameFilter` object. |
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1195 |
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1196 :param use_chroot: Refer to :func:`find_hostname()`. |
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1197 """ |
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1198 self.hostname = find_hostname(use_chroot) |
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1199 |
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1200 def filter(self, record): |
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1201 """Set each :class:`~logging.LogRecord`'s `hostname` field.""" |
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1202 # Modify the record. |
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1203 record.hostname = self.hostname |
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1204 # Don't filter the record. |
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1205 return 1 |
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1206 |
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1207 |
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1208 class ProgramNameFilter(logging.Filter): |
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1209 |
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1210 """ |
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1211 Log filter to enable the ``%(programname)s`` format. |
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1212 |
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1213 Python's :mod:`logging` module doesn't expose the name of the currently |
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1214 running program while I consider this to be a useful addition. Fortunately |
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1215 it's very easy to expose additional fields in format strings: |
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1216 :func:`filter()` simply sets the ``programname`` attribute of each |
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1217 :class:`~logging.LogRecord` object it receives and this is enough to enable |
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1218 the use of the ``%(programname)s`` expression in format strings. |
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1219 |
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1220 Refer to :class:`HostNameFilter` for an example of how to manually install |
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1221 these log filters. |
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1222 """ |
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1223 |
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1224 @classmethod |
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1225 def install(cls, handler, fmt, programname=None, style=DEFAULT_FORMAT_STYLE): |
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1226 """ |
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1227 Install the :class:`ProgramNameFilter` (only if needed). |
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1228 |
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1229 :param fmt: The log format string to check for ``%(programname)``. |
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1230 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1231 :data:`DEFAULT_FORMAT_STYLE`). |
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1232 :param handler: The logging handler on which to install the filter. |
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1233 :param programname: Refer to :func:`__init__()`. |
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1234 |
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1235 If `fmt` is given the filter will only be installed if `fmt` uses the |
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1236 ``programname`` field. If `fmt` is not given the filter is installed |
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1237 unconditionally. |
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1238 """ |
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1239 if fmt: |
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1240 parser = FormatStringParser(style=style) |
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1241 if not parser.contains_field(fmt, 'programname'): |
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1242 return |
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1243 handler.addFilter(cls(programname)) |
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1244 |
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1245 def __init__(self, programname=None): |
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1246 """ |
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1247 Initialize a :class:`ProgramNameFilter` object. |
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1248 |
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1249 :param programname: The program name to use (defaults to the result of |
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1250 :func:`find_program_name()`). |
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1251 """ |
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1252 self.programname = programname or find_program_name() |
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1253 |
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1254 def filter(self, record): |
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1255 """Set each :class:`~logging.LogRecord`'s `programname` field.""" |
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1256 # Modify the record. |
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1257 record.programname = self.programname |
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1258 # Don't filter the record. |
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1259 return 1 |
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1260 |
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1261 |
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1262 class UserNameFilter(logging.Filter): |
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1263 |
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1264 """ |
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1265 Log filter to enable the ``%(username)s`` format. |
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1266 |
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1267 Python's :mod:`logging` module doesn't expose the username of the currently |
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1268 logged in user as requested in `#76`_. Given that :class:`HostNameFilter` |
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1269 and :class:`ProgramNameFilter` are already provided by `coloredlogs` it |
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1270 made sense to provide :class:`UserNameFilter` as well. |
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1271 |
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1272 Refer to :class:`HostNameFilter` for an example of how to manually install |
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1273 these log filters. |
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1274 |
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1275 .. _#76: https://github.com/xolox/python-coloredlogs/issues/76 |
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1276 """ |
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1277 |
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1278 @classmethod |
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1279 def install(cls, handler, fmt, username=None, style=DEFAULT_FORMAT_STYLE): |
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1280 """ |
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1281 Install the :class:`UserNameFilter` (only if needed). |
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1282 |
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1283 :param fmt: The log format string to check for ``%(username)``. |
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1284 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1285 :data:`DEFAULT_FORMAT_STYLE`). |
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1286 :param handler: The logging handler on which to install the filter. |
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1287 :param username: Refer to :func:`__init__()`. |
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1288 |
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1289 If `fmt` is given the filter will only be installed if `fmt` uses the |
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1290 ``username`` field. If `fmt` is not given the filter is installed |
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1291 unconditionally. |
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1292 """ |
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1293 if fmt: |
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1294 parser = FormatStringParser(style=style) |
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1295 if not parser.contains_field(fmt, 'username'): |
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1296 return |
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1297 handler.addFilter(cls(username)) |
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1298 |
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1299 def __init__(self, username=None): |
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1300 """ |
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1301 Initialize a :class:`UserNameFilter` object. |
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1302 |
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1303 :param username: The username to use (defaults to the |
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1304 result of :func:`find_username()`). |
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1305 """ |
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1306 self.username = username or find_username() |
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1307 |
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1308 def filter(self, record): |
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1309 """Set each :class:`~logging.LogRecord`'s `username` field.""" |
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1310 # Modify the record. |
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1311 record.username = self.username |
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1312 # Don't filter the record. |
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1313 return 1 |
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1314 |
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1315 |
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1316 class StandardErrorHandler(logging.StreamHandler): |
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1317 |
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1318 """ |
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1319 A :class:`~logging.StreamHandler` that gets the value of :data:`sys.stderr` for each log message. |
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1320 |
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1321 The :class:`StandardErrorHandler` class enables `monkey patching of |
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1322 sys.stderr <https://github.com/xolox/python-coloredlogs/pull/31>`_. It's |
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1323 basically the same as the ``logging._StderrHandler`` class present in |
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1324 Python 3 but it will be available regardless of Python version. This |
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1325 handler is used by :func:`coloredlogs.install()` to improve compatibility |
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1326 with the Python standard library. |
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1327 """ |
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1328 |
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1329 def __init__(self, level=logging.NOTSET): |
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1330 """Initialize a :class:`StandardErrorHandler` object.""" |
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1331 logging.Handler.__init__(self, level) |
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1332 |
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1333 @property |
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1334 def stream(self): |
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1335 """Get the value of :data:`sys.stderr` (a file-like object).""" |
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1336 return sys.stderr |
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1337 |
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1338 |
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1339 class FormatStringParser(object): |
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1340 |
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1341 """ |
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1342 Shallow logging format string parser. |
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1343 |
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1344 This class enables introspection and manipulation of logging format strings |
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1345 in the three styles supported by the :mod:`logging` module starting from |
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1346 Python 3.2 (``%``, ``{`` and ``$``). |
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1347 """ |
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1348 |
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1349 def __init__(self, style=DEFAULT_FORMAT_STYLE): |
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1350 """ |
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1351 Initialize a :class:`FormatStringParser` object. |
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1352 |
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1353 :param style: One of the characters ``%``, ``{`` or ``$`` (defaults to |
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1354 :data:`DEFAULT_FORMAT_STYLE`). |
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1355 :raises: Refer to :func:`check_style()`. |
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1356 """ |
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1357 self.style = check_style(style) |
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1358 self.capturing_pattern = FORMAT_STYLE_PATTERNS[style] |
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1359 # Remove the capture group around the mapping key / field name. |
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1360 self.raw_pattern = self.capturing_pattern.replace(r'(\w+)', r'\w+') |
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1361 # After removing the inner capture group we add an outer capture group |
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1362 # to make the pattern suitable for simple tokenization using re.split(). |
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1363 self.tokenize_pattern = re.compile('(%s)' % self.raw_pattern, re.VERBOSE) |
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1364 # Compile a regular expression for finding field names. |
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1365 self.name_pattern = re.compile(self.capturing_pattern, re.VERBOSE) |
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1366 |
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1367 def contains_field(self, format_string, field_name): |
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1368 """ |
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1369 Get the field names referenced by a format string. |
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1370 |
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1371 :param format_string: The logging format string. |
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1372 :returns: A list of strings with field names. |
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1373 """ |
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1374 return field_name in self.get_field_names(format_string) |
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1375 |
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1376 def get_field_names(self, format_string): |
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1377 """ |
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1378 Get the field names referenced by a format string. |
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1379 |
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1380 :param format_string: The logging format string. |
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1381 :returns: A list of strings with field names. |
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1382 """ |
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1383 return self.name_pattern.findall(format_string) |
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1384 |
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1385 def get_grouped_pairs(self, format_string): |
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1386 """ |
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1387 Group the results of :func:`get_pairs()` separated by whitespace. |
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1388 |
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1389 :param format_string: The logging format string. |
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1390 :returns: A list of lists of :class:`FormatStringToken` objects. |
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1391 """ |
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1392 # Step 1: Split simple tokens (without a name) into |
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1393 # their whitespace parts and non-whitespace parts. |
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1394 separated = [] |
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1395 pattern = re.compile(r'(\s+)') |
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1396 for token in self.get_pairs(format_string): |
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1397 if token.name: |
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1398 separated.append(token) |
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1399 else: |
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1400 separated.extend( |
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1401 FormatStringToken(name=None, text=text) |
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1402 for text in pattern.split(token.text) if text |
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1403 ) |
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1404 # Step 2: Group tokens together based on whitespace. |
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1405 current_group = [] |
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1406 grouped_pairs = [] |
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1407 for token in separated: |
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1408 if token.text.isspace(): |
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1409 if current_group: |
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1410 grouped_pairs.append(current_group) |
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1411 grouped_pairs.append([token]) |
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1412 current_group = [] |
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1413 else: |
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1414 current_group.append(token) |
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1415 if current_group: |
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1416 grouped_pairs.append(current_group) |
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1417 return grouped_pairs |
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1418 |
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1419 def get_pairs(self, format_string): |
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1420 """ |
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1421 Tokenize a logging format string and extract field names from tokens. |
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1422 |
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1423 :param format_string: The logging format string. |
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1424 :returns: A generator of :class:`FormatStringToken` objects. |
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1425 """ |
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1426 for token in self.get_tokens(format_string): |
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1427 match = self.name_pattern.search(token) |
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1428 name = match.group(1) if match else None |
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1429 yield FormatStringToken(name=name, text=token) |
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1430 |
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1431 def get_pattern(self, field_name): |
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1432 """ |
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1433 Get a regular expression to match a formatting directive that references the given field name. |
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1434 |
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1435 :param field_name: The name of the field to match (a string). |
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1436 :returns: A compiled regular expression object. |
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1437 """ |
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1438 return re.compile(self.raw_pattern.replace(r'\w+', field_name), re.VERBOSE) |
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1439 |
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1440 def get_tokens(self, format_string): |
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1441 """ |
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1442 Tokenize a logging format string. |
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1443 |
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1444 :param format_string: The logging format string. |
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1445 :returns: A list of strings with formatting directives separated from surrounding text. |
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1446 """ |
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1447 return [t for t in self.tokenize_pattern.split(format_string) if t] |
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1448 |
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1449 |
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1450 class FormatStringToken(collections.namedtuple('FormatStringToken', 'text, name')): |
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1451 |
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1452 """ |
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1453 A named tuple for the results of :func:`FormatStringParser.get_pairs()`. |
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1454 |
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1455 .. attribute:: name |
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1456 |
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1457 The field name referenced in `text` (a string). If `text` doesn't |
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1458 contain a formatting directive this will be :data:`None`. |
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1459 |
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1460 .. attribute:: text |
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1461 |
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1462 The text extracted from the logging format string (a string). |
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1463 """ |
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1464 |
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1465 |
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1466 class NameNormalizer(object): |
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1467 |
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1468 """Responsible for normalizing field and level names.""" |
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1469 |
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1470 def __init__(self): |
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1471 """Initialize a :class:`NameNormalizer` object.""" |
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1472 self.aliases = {k.lower(): v.lower() for k, v in find_level_aliases().items()} |
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1473 |
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1474 def normalize_name(self, name): |
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1475 """ |
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1476 Normalize a field or level name. |
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1477 |
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1478 :param name: The field or level name (a string). |
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1479 :returns: The normalized name (a string). |
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1480 |
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1481 Transforms all strings to lowercase and resolves level name aliases |
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1482 (refer to :func:`find_level_aliases()`) to their canonical name: |
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1483 |
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1484 >>> from coloredlogs import NameNormalizer |
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1485 >>> from humanfriendly import format_table |
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1486 >>> nn = NameNormalizer() |
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1487 >>> sample_names = ['DEBUG', 'INFO', 'WARN', 'WARNING', 'ERROR', 'FATAL', 'CRITICAL'] |
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1488 >>> print(format_table([(n, nn.normalize_name(n)) for n in sample_names])) |
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1489 ----------------------- |
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1490 | DEBUG | debug | |
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1491 | INFO | info | |
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1492 | WARN | warning | |
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1493 | WARNING | warning | |
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1494 | ERROR | error | |
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1495 | FATAL | critical | |
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1496 | CRITICAL | critical | |
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1497 ----------------------- |
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1498 """ |
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1499 name = name.lower() |
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1500 if name in self.aliases: |
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1501 name = self.aliases[name] |
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1502 return name |
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1503 |
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1504 def normalize_keys(self, value): |
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1505 """ |
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1506 Normalize the keys of a dictionary using :func:`normalize_name()`. |
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1507 |
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1508 :param value: The dictionary to normalize. |
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1509 :returns: A dictionary with normalized keys. |
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1510 """ |
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1511 return {self.normalize_name(k): v for k, v in value.items()} |
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1512 |
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1513 def get(self, normalized_dict, name): |
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1514 """ |
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1515 Get a value from a dictionary after normalizing the key. |
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1516 |
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1517 :param normalized_dict: A dictionary produced by :func:`normalize_keys()`. |
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1518 :param name: A key to normalize and get from the dictionary. |
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1519 :returns: The value of the normalized key (if any). |
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1520 """ |
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1521 return normalized_dict.get(self.normalize_name(name)) |