Mercurial > libervia-backend
annotate sat/core/log.py @ 3678:ba4ef64a6938
doc: components documentation:
rel 362
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 26 Sep 2021 16:38:00 +0200 |
| parents | 7550ae9cfbac |
| children | 8289ac1b34f4 |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
| 991 | 3 |
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Renamed the project from "Salut à Toi" to "Libervia":
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4 # Libervia: an XMPP client |
| 3479 | 5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
| 991 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 """High level logging functions""" | |
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21 # XXX: this module use standard logging module when possible, but as SàT can work in different cases where logging is not the best choice (twisted, pyjamas, etc), it is necessary to have a dedicated module. Additional feature like environment variables and colors are also managed. |
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22 # TODO: change formatting from "%s" style to "{}" when moved to Python 3 |
| 991 | 23 |
| 24 from sat.core.constants import Const as C | |
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25 from sat.tools.common.ansi import ANSI as A |
| 991 | 26 from sat.core import exceptions |
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27 import traceback |
| 991 | 28 |
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29 backend = None |
| 991 | 30 _loggers = {} |
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31 handlers = {} |
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32 COLOR_START = '%(color_start)s' |
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33 COLOR_END = '%(color_end)s' |
| 991 | 34 |
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35 |
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36 class Filtered(Exception): |
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37 pass |
| 991 | 38 |
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39 |
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40 class Logger: |
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41 """High level logging class""" |
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42 fmt = None # format option as given by user (e.g. SAT_LOG_LOGGER) |
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43 filter_name = None # filter to call |
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44 post_treat = None |
| 991 | 45 |
| 46 def __init__(self, name): | |
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47 if isinstance(name, Logger): |
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48 self.copy(name) |
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49 else: |
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50 self._name = name |
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51 |
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52 def copy(self, other): |
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53 """Copy values from other Logger""" |
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54 self.fmt = other.fmt |
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55 self.Filter_name = other.fmt |
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56 self.post_treat = other.post_treat |
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57 self._name = other._name |
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58 |
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59 def addTraceback(self, message): |
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60 tb = traceback.format_exc() |
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61 return message + "\n==== traceback ====\n" + tb |
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62 |
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63 def out(self, message, level=None, **kwargs): |
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64 """Actually log the message |
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65 |
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66 @param message: formatted message |
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67 """ |
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68 if kwargs.get('exc_info', False): |
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69 message = self.addTraceback(message) |
| 3028 | 70 print(message) |
| 991 | 71 |
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72 def log(self, level, message, **kwargs): |
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73 """Print message |
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74 |
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75 @param level: one of C.LOG_LEVELS |
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76 @param message: message to format and print |
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77 """ |
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78 try: |
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79 formatted = self.format(level, message) |
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80 if self.post_treat is None: |
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81 self.out(formatted, level, **kwargs) |
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82 else: |
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83 self.out(self.post_treat(level, formatted), level, **kwargs) |
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84 except Filtered: |
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85 pass |
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86 |
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87 def format(self, level, message): |
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88 """Format message according to Logger.fmt |
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89 |
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90 @param level: one of C.LOG_LEVELS |
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91 @param message: message to format |
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92 @return: formatted message |
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93 |
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94 @raise: Filtered when the message must not be logged |
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95 """ |
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96 if self.fmt is None and self.filter_name is None: |
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97 return message |
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98 record = {'name': self._name, |
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99 'message': message, |
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100 'levelname': level, |
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101 } |
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102 try: |
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103 if not self.filter_name.dictFilter(record): |
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104 raise Filtered |
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105 except (AttributeError, TypeError): # XXX: TypeError is here because of a pyjamas bug which need to be fixed (TypeError is raised instead of AttributeError) |
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106 if self.filter_name is not None: |
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107 raise ValueError("Bad filter: filters must have a .filter method") |
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108 try: |
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109 return self.fmt % record |
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110 except TypeError: |
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111 return message |
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112 except KeyError as e: |
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113 if e.args[0] == 'profile': |
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114 # XXX: %(profile)s use some magic with introspection, for debugging purpose only *DO NOT* use in production |
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115 record['profile'] = configure_cls[backend].getProfile() |
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116 return self.fmt % record |
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117 else: |
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118 raise e |
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119 |
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120 def debug(self, msg, **kwargs): |
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121 self.log(C.LOG_LVL_DEBUG, msg, **kwargs) |
| 991 | 122 |
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123 def info(self, msg, **kwargs): |
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124 self.log(C.LOG_LVL_INFO, msg, **kwargs) |
| 991 | 125 |
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126 def warning(self, msg, **kwargs): |
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127 self.log(C.LOG_LVL_WARNING, msg, **kwargs) |
| 991 | 128 |
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129 def error(self, msg, **kwargs): |
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130 self.log(C.LOG_LVL_ERROR, msg, **kwargs) |
| 991 | 131 |
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132 def critical(self, msg, **kwargs): |
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133 self.log(C.LOG_LVL_CRITICAL, msg, **kwargs) |
| 991 | 134 |
| 135 | |
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136 class FilterName(object): |
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137 """Filter on logger name according to a regex""" |
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138 |
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139 def __init__(self, name_re): |
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140 """Initialise name filter |
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141 |
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142 @param name_re: regular expression used to filter names (using search and not match) |
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143 """ |
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144 assert name_re |
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145 import re |
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146 self.name_re = re.compile(name_re) |
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147 |
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148 def filter(self, record): |
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149 if self.name_re.search(record.name) is not None: |
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150 return 1 |
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151 return 0 |
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152 |
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153 def dictFilter(self, dict_record): |
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154 """Filter using a dictionary record |
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155 |
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156 @param dict_record: dictionary with at list a key "name" with logger name |
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157 @return: True if message should be logged |
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158 """ |
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159 class LogRecord(object): |
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160 pass |
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161 log_record = LogRecord() |
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162 log_record.name = dict_record['name'] |
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163 return self.filter(log_record) == 1 |
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164 |
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165 |
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166 class ConfigureBase: |
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167 LOGGER_CLASS = Logger |
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168 # True if color location is specified in fmt (with COLOR_START) |
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169 _color_location = False |
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170 |
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171 def __init__(self, level=None, fmt=None, output=None, logger=None, colors=False, |
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172 levels_taints_dict=None, force_colors=False, backend_data=None): |
|
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173 """Configure a backend |
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174 |
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175 @param level: one of C.LOG_LEVELS |
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176 @param fmt: format string, pretty much as in std logging. |
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177 Accept the following keywords (maybe more depending on backend): |
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178 - "message" |
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179 - "levelname" |
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180 - "name" (logger name) |
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181 @param logger: if set, use it as a regular expression to filter on logger name. |
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182 Use search to match expression, so ^ or $ can be necessary. |
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183 @param colors: if True use ANSI colors to show log levels |
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184 @param force_colors: if True ANSI colors are used even if stdout is not a tty |
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185 """ |
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186 self.backend_data = backend_data |
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187 self.preTreatment() |
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188 self.configureLevel(level) |
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189 self.configureFormat(fmt) |
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190 self.configureOutput(output) |
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191 self.configureLogger(logger) |
| 1942 | 192 self.configureColors(colors, force_colors, levels_taints_dict) |
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193 self.postTreatment() |
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194 self.updateCurrentLogger() |
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195 |
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196 def updateCurrentLogger(self): |
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197 """update existing logger to the class needed for this backend""" |
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198 if self.LOGGER_CLASS is None: |
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199 return |
| 3028 | 200 for name, logger in list(_loggers.items()): |
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201 _loggers[name] = self.LOGGER_CLASS(logger) |
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202 |
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203 def preTreatment(self): |
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204 pass |
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205 |
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206 def configureLevel(self, level): |
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207 if level is not None: |
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208 # we deactivate methods below level |
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209 level_idx = C.LOG_LEVELS.index(level) |
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210 def dev_null(self, msg): |
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211 pass |
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212 for _level in C.LOG_LEVELS[:level_idx]: |
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213 setattr(Logger, _level.lower(), dev_null) |
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214 |
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215 def configureFormat(self, fmt): |
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216 if fmt is not None: |
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217 if fmt != '%(message)s': # %(message)s is the same as None |
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218 Logger.fmt = fmt |
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219 if COLOR_START in fmt: |
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220 ConfigureBase._color_location = True |
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221 if fmt.find(COLOR_END,fmt.rfind(COLOR_START))<0: |
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222 # color_start not followed by an end, we add it |
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223 Logger.fmt += COLOR_END |
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224 |
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225 def configureOutput(self, output): |
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226 if output is not None: |
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227 if output != C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT: |
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228 # TODO: manage other outputs |
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229 raise NotImplementedError("Basic backend only manage default output yet") |
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230 |
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231 def configureLogger(self, logger): |
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232 if logger: |
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233 Logger.filter_name = FilterName(logger) |
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234 |
| 1942 | 235 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 236 if colors: | |
| 237 # if color are used, we need to handle levels_taints_dict | |
| 3028 | 238 for level in list(levels_taints_dict.keys()): |
| 1942 | 239 # we wants levels in uppercase to correspond to contstants |
| 240 levels_taints_dict[level.upper()] = levels_taints_dict[level] | |
| 241 taints = self.__class__.taints = {} | |
| 242 for level in C.LOG_LEVELS: | |
| 243 # we want use values and use constant value as default | |
| 244 taint_list = levels_taints_dict.get(level, C.LOG_OPT_TAINTS_DICT[1][level]) | |
| 245 ansi_list = [] | |
| 246 for elt in taint_list: | |
| 247 elt = elt.upper() | |
| 248 try: | |
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249 ansi = getattr(A, 'FG_{}'.format(elt)) |
| 1942 | 250 except AttributeError: |
| 251 try: | |
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252 ansi = getattr(A, elt) |
| 1942 | 253 except AttributeError: |
| 254 # we use raw string if element is unknown | |
| 255 ansi = elt | |
| 256 ansi_list.append(ansi) | |
| 257 taints[level] = ''.join(ansi_list) | |
|
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258 |
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259 def postTreatment(self): |
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260 pass |
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261 |
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262 def manageOutputs(self, outputs_raw): |
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263 """ Parse output option in a backend agnostic way, and fill handlers consequently |
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264 |
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265 @param outputs_raw: output option as enterred in environment variable or in configuration |
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266 """ |
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267 if not outputs_raw: |
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268 return |
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269 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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270 global handlers |
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271 if len(outputs) == 1: |
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272 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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273 |
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274 for output in outputs: |
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275 if not output: |
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276 continue |
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277 if output[-1] == ')': |
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278 # we have options |
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279 opt_begin = output.rfind('(') |
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280 options = output[opt_begin+1:-1] |
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281 output = output[:opt_begin] |
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282 else: |
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283 options = None |
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284 |
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285 if output not in (C.LOG_OPT_OUTPUT_DEFAULT, C.LOG_OPT_OUTPUT_FILE, C.LOG_OPT_OUTPUT_MEMORY): |
| 3028 | 286 raise ValueError("Invalid output [%s]" % output) |
|
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287 |
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288 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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289 # no option for defaut handler |
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290 handlers[output] = None |
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291 elif output == C.LOG_OPT_OUTPUT_FILE: |
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292 if not options: |
|
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293 ValueError("{handler} output need a path as option" .format(handle=output)) |
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294 handlers.setdefault(output, []).append(options) |
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295 options = None # option are parsed, we can empty them |
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296 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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297 # we have memory handler, option can be the len limit or None |
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298 try: |
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299 limit = int(options) |
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300 options = None # option are parsed, we can empty them |
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301 except (TypeError, ValueError): |
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302 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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303 handlers[output] = limit |
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304 |
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305 if options: # we should not have unparsed options |
| 3028 | 306 raise ValueError("options [{options}] are not supported for {handler} output".format(options=options, handler=output)) |
|
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307 |
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308 @staticmethod |
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309 def memoryGet(size=None): |
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310 """Return buffered logs |
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311 |
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312 @param size: number of logs to return |
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313 """ |
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314 raise NotImplementedError |
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315 |
|
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316 @classmethod |
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317 def ansiColors(cls, level, message): |
|
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318 """Colorise message depending on level for terminals |
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319 |
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320 @param level: one of C.LOG_LEVELS |
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321 @param message: formatted message to log |
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322 @return: message with ANSI escape codes for coloration |
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323 """ |
| 1942 | 324 |
| 325 try: | |
| 326 start = cls.taints[level] | |
| 327 except KeyError: | |
| 328 start = '' | |
| 329 | |
|
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330 if cls._color_location: |
| 1942 | 331 return message % {'color_start': start, |
|
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332 'color_end': A.RESET} |
|
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333 else: |
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334 return '%s%s%s' % (start, message, A.RESET) |
|
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335 |
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336 @staticmethod |
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337 def getProfile(): |
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338 """Try to find profile value using introspection""" |
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339 raise NotImplementedError |
|
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340 |
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341 |
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342 class ConfigureCustom(ConfigureBase): |
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343 LOGGER_CLASS = None |
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344 |
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345 def __init__(self, logger_class, *args, **kwargs): |
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346 ConfigureCustom.LOGGER_CLASS = logger_class |
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347 |
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348 |
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349 configure_cls = { None: ConfigureBase, |
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350 C.LOG_BACKEND_CUSTOM: ConfigureCustom |
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351 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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352 |
|
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353 |
|
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354 def configure(backend_, **options): |
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355 """Configure logging behaviour |
| 991 | 356 @param backend: can be: |
| 357 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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358 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 359 """ |
|
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360 global backend |
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361 if backend is not None: |
| 991 | 362 raise exceptions.InternalError("Logging can only be configured once") |
|
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363 backend = backend_ |
|
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364 |
|
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365 try: |
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366 configure_class = configure_cls[backend] |
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367 except KeyError: |
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368 raise ValueError("unknown backend [{}]".format(backend)) |
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369 if backend == C.LOG_BACKEND_CUSTOM: |
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370 logger_class = options.pop('logger_class') |
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371 configure_class(logger_class, **options) |
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372 else: |
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373 configure_class(**options) |
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374 |
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375 def memoryGet(size=None): |
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376 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
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377 raise ValueError('memory output is not used') |
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378 return configure_cls[backend].memoryGet(size) |
| 991 | 379 |
| 380 def getLogger(name=C.LOG_BASE_LOGGER): | |
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381 try: |
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382 logger_class = configure_cls[backend].LOGGER_CLASS |
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383 except KeyError: |
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384 raise ValueError("This method should not be called with backend [{}]".format(backend)) |
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385 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 386 |
| 387 _root_logger = getLogger() | |
| 388 | |
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389 def debug(msg, **kwargs): |
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390 _root_logger.debug(msg, **kwargs) |
| 991 | 391 |
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392 def info(msg, **kwargs): |
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393 _root_logger.info(msg, **kwargs) |
| 991 | 394 |
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395 def warning(msg, **kwargs): |
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396 _root_logger.warning(msg, **kwargs) |
| 991 | 397 |
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398 def error(msg, **kwargs): |
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399 _root_logger.error(msg, **kwargs) |
| 991 | 400 |
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401 def critical(msg, **kwargs): |
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402 _root_logger.critical(msg, **kwargs) |