Mercurial > libervia-backend
annotate sat/core/log.py @ 3984:425d809a505b
doc (components): typo
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Tue, 22 Nov 2022 11:53:31 +0100 |
| parents | 8289ac1b34f4 |
| children | 760f563b1243 |
| 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 |
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24 from typing import TYPE_CHECKING, Any, Optional |
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25 from typing_extensions import TypedDict |
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26 |
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27 if TYPE_CHECKING: |
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28 from logging import _ExcInfoType |
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29 else: |
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30 _ExcInfoType = Any |
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31 |
| 991 | 32 from sat.core.constants import Const as C |
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33 from sat.tools.common.ansi import ANSI as A |
| 991 | 34 from sat.core import exceptions |
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35 import traceback |
| 991 | 36 |
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37 backend = None |
| 991 | 38 _loggers = {} |
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39 handlers = {} |
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40 COLOR_START = '%(color_start)s' |
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41 COLOR_END = '%(color_end)s' |
| 991 | 42 |
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43 |
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44 class Filtered(Exception): |
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45 pass |
| 991 | 46 |
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47 |
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48 class KWArgs(TypedDict): |
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49 exc_info: _ExcInfoType |
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50 |
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51 |
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52 class Logger: |
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53 """High level logging class""" |
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54 fmt = None # format option as given by user (e.g. SAT_LOG_LOGGER) |
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55 filter_name = None # filter to call |
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56 post_treat = None |
| 991 | 57 |
| 58 def __init__(self, name): | |
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59 if isinstance(name, Logger): |
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60 self.copy(name) |
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61 else: |
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62 self._name = name |
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63 |
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64 def copy(self, other): |
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65 """Copy values from other Logger""" |
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66 self.fmt = other.fmt |
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67 self.Filter_name = other.fmt |
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68 self.post_treat = other.post_treat |
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69 self._name = other._name |
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70 |
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71 def addTraceback(self, message): |
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72 tb = traceback.format_exc() |
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73 return message + "\n==== traceback ====\n" + tb |
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74 |
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75 def out(self, message: object, level: Optional[str] = None, **kwargs: KWArgs) -> None: |
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76 """Actually log the message |
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77 |
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78 @param message: formatted message |
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79 """ |
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80 if kwargs.get('exc_info', False): |
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81 message = self.addTraceback(message) |
| 3028 | 82 print(message) |
| 991 | 83 |
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84 def log(self, level: str, message: object, **kwargs: KWArgs) -> None: |
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85 """Print message |
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86 |
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87 @param level: one of C.LOG_LEVELS |
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88 @param message: message to format and print |
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89 """ |
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90 try: |
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91 formatted = self.format(level, message) |
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92 if self.post_treat is None: |
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93 self.out(formatted, level, **kwargs) |
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94 else: |
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95 self.out(self.post_treat(level, formatted), level, **kwargs) |
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96 except Filtered: |
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97 pass |
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98 |
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99 def format(self, level: str, message: object) -> object: |
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100 """Format message according to Logger.fmt |
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101 |
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102 @param level: one of C.LOG_LEVELS |
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103 @param message: message to format |
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104 @return: formatted message |
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105 |
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106 @raise: Filtered when the message must not be logged |
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107 """ |
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108 if self.fmt is None and self.filter_name is None: |
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109 return message |
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110 record = {'name': self._name, |
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111 'message': message, |
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112 'levelname': level, |
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113 } |
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114 try: |
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115 if not self.filter_name.dictFilter(record): |
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116 raise Filtered |
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117 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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118 if self.filter_name is not None: |
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119 raise ValueError("Bad filter: filters must have a .filter method") |
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120 try: |
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121 return self.fmt % record |
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122 except TypeError: |
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123 return message |
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124 except KeyError as e: |
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125 if e.args[0] == 'profile': |
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126 # XXX: %(profile)s use some magic with introspection, for debugging purpose only *DO NOT* use in production |
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127 record['profile'] = configure_cls[backend].getProfile() |
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128 return self.fmt % record |
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129 else: |
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130 raise e |
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131 |
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132 def debug(self, msg: object, **kwargs: KWArgs) -> None: |
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133 self.log(C.LOG_LVL_DEBUG, msg, **kwargs) |
| 991 | 134 |
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135 def info(self, msg: object, **kwargs: KWArgs) -> None: |
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136 self.log(C.LOG_LVL_INFO, msg, **kwargs) |
| 991 | 137 |
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138 def warning(self, msg: object, **kwargs: KWArgs) -> None: |
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139 self.log(C.LOG_LVL_WARNING, msg, **kwargs) |
| 991 | 140 |
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141 def error(self, msg: object, **kwargs: KWArgs) -> None: |
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142 self.log(C.LOG_LVL_ERROR, msg, **kwargs) |
| 991 | 143 |
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144 def critical(self, msg: object, **kwargs: KWArgs) -> None: |
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145 self.log(C.LOG_LVL_CRITICAL, msg, **kwargs) |
| 991 | 146 |
| 147 | |
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148 class FilterName(object): |
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149 """Filter on logger name according to a regex""" |
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150 |
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151 def __init__(self, name_re): |
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152 """Initialise name filter |
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153 |
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154 @param name_re: regular expression used to filter names (using search and not match) |
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155 """ |
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156 assert name_re |
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157 import re |
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158 self.name_re = re.compile(name_re) |
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159 |
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160 def filter(self, record): |
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161 if self.name_re.search(record.name) is not None: |
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162 return 1 |
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163 return 0 |
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164 |
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165 def dictFilter(self, dict_record): |
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166 """Filter using a dictionary record |
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167 |
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168 @param dict_record: dictionary with at list a key "name" with logger name |
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169 @return: True if message should be logged |
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170 """ |
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171 class LogRecord(object): |
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172 pass |
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173 log_record = LogRecord() |
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174 log_record.name = dict_record['name'] |
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175 return self.filter(log_record) == 1 |
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176 |
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177 |
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178 class ConfigureBase: |
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179 LOGGER_CLASS = Logger |
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180 # True if color location is specified in fmt (with COLOR_START) |
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181 _color_location = False |
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182 |
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183 def __init__(self, level=None, fmt=None, output=None, logger=None, colors=False, |
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184 levels_taints_dict=None, force_colors=False, backend_data=None): |
|
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185 """Configure a backend |
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186 |
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187 @param level: one of C.LOG_LEVELS |
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188 @param fmt: format string, pretty much as in std logging. |
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189 Accept the following keywords (maybe more depending on backend): |
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190 - "message" |
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191 - "levelname" |
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192 - "name" (logger name) |
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193 @param logger: if set, use it as a regular expression to filter on logger name. |
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194 Use search to match expression, so ^ or $ can be necessary. |
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195 @param colors: if True use ANSI colors to show log levels |
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196 @param force_colors: if True ANSI colors are used even if stdout is not a tty |
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197 """ |
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198 self.backend_data = backend_data |
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199 self.preTreatment() |
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200 self.configureLevel(level) |
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201 self.configureFormat(fmt) |
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202 self.configureOutput(output) |
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203 self.configureLogger(logger) |
| 1942 | 204 self.configureColors(colors, force_colors, levels_taints_dict) |
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205 self.postTreatment() |
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206 self.updateCurrentLogger() |
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207 |
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208 def updateCurrentLogger(self): |
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209 """update existing logger to the class needed for this backend""" |
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210 if self.LOGGER_CLASS is None: |
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211 return |
| 3028 | 212 for name, logger in list(_loggers.items()): |
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213 _loggers[name] = self.LOGGER_CLASS(logger) |
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214 |
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215 def preTreatment(self): |
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216 pass |
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217 |
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218 def configureLevel(self, level): |
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219 if level is not None: |
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220 # we deactivate methods below level |
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221 level_idx = C.LOG_LEVELS.index(level) |
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222 def dev_null(self, msg): |
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223 pass |
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224 for _level in C.LOG_LEVELS[:level_idx]: |
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225 setattr(Logger, _level.lower(), dev_null) |
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226 |
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227 def configureFormat(self, fmt): |
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228 if fmt is not None: |
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229 if fmt != '%(message)s': # %(message)s is the same as None |
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230 Logger.fmt = fmt |
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231 if COLOR_START in fmt: |
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232 ConfigureBase._color_location = True |
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233 if fmt.find(COLOR_END,fmt.rfind(COLOR_START))<0: |
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234 # color_start not followed by an end, we add it |
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235 Logger.fmt += COLOR_END |
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236 |
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237 def configureOutput(self, output): |
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238 if output is not None: |
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239 if output != C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT: |
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240 # TODO: manage other outputs |
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241 raise NotImplementedError("Basic backend only manage default output yet") |
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242 |
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243 def configureLogger(self, logger): |
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244 if logger: |
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245 Logger.filter_name = FilterName(logger) |
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246 |
| 1942 | 247 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 248 if colors: | |
| 249 # if color are used, we need to handle levels_taints_dict | |
| 3028 | 250 for level in list(levels_taints_dict.keys()): |
| 1942 | 251 # we wants levels in uppercase to correspond to contstants |
| 252 levels_taints_dict[level.upper()] = levels_taints_dict[level] | |
| 253 taints = self.__class__.taints = {} | |
| 254 for level in C.LOG_LEVELS: | |
| 255 # we want use values and use constant value as default | |
| 256 taint_list = levels_taints_dict.get(level, C.LOG_OPT_TAINTS_DICT[1][level]) | |
| 257 ansi_list = [] | |
| 258 for elt in taint_list: | |
| 259 elt = elt.upper() | |
| 260 try: | |
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261 ansi = getattr(A, 'FG_{}'.format(elt)) |
| 1942 | 262 except AttributeError: |
| 263 try: | |
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264 ansi = getattr(A, elt) |
| 1942 | 265 except AttributeError: |
| 266 # we use raw string if element is unknown | |
| 267 ansi = elt | |
| 268 ansi_list.append(ansi) | |
| 269 taints[level] = ''.join(ansi_list) | |
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270 |
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271 def postTreatment(self): |
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272 pass |
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273 |
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274 def manageOutputs(self, outputs_raw): |
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275 """ Parse output option in a backend agnostic way, and fill handlers consequently |
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276 |
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277 @param outputs_raw: output option as enterred in environment variable or in configuration |
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278 """ |
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279 if not outputs_raw: |
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280 return |
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281 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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282 global handlers |
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283 if len(outputs) == 1: |
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284 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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285 |
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286 for output in outputs: |
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287 if not output: |
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288 continue |
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289 if output[-1] == ')': |
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290 # we have options |
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291 opt_begin = output.rfind('(') |
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292 options = output[opt_begin+1:-1] |
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293 output = output[:opt_begin] |
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294 else: |
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295 options = None |
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296 |
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297 if output not in (C.LOG_OPT_OUTPUT_DEFAULT, C.LOG_OPT_OUTPUT_FILE, C.LOG_OPT_OUTPUT_MEMORY): |
| 3028 | 298 raise ValueError("Invalid output [%s]" % output) |
|
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299 |
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300 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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301 # no option for defaut handler |
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302 handlers[output] = None |
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303 elif output == C.LOG_OPT_OUTPUT_FILE: |
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304 if not options: |
|
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305 ValueError("{handler} output need a path as option" .format(handle=output)) |
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306 handlers.setdefault(output, []).append(options) |
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307 options = None # option are parsed, we can empty them |
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308 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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309 # we have memory handler, option can be the len limit or None |
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310 try: |
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311 limit = int(options) |
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312 options = None # option are parsed, we can empty them |
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313 except (TypeError, ValueError): |
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314 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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315 handlers[output] = limit |
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316 |
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317 if options: # we should not have unparsed options |
| 3028 | 318 raise ValueError("options [{options}] are not supported for {handler} output".format(options=options, handler=output)) |
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319 |
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320 @staticmethod |
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321 def memoryGet(size=None): |
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322 """Return buffered logs |
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323 |
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324 @param size: number of logs to return |
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325 """ |
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326 raise NotImplementedError |
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327 |
|
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328 @classmethod |
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329 def ansiColors(cls, level, message): |
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330 """Colorise message depending on level for terminals |
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331 |
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332 @param level: one of C.LOG_LEVELS |
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333 @param message: formatted message to log |
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334 @return: message with ANSI escape codes for coloration |
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335 """ |
| 1942 | 336 |
| 337 try: | |
| 338 start = cls.taints[level] | |
| 339 except KeyError: | |
| 340 start = '' | |
| 341 | |
|
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342 if cls._color_location: |
| 1942 | 343 return message % {'color_start': start, |
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344 'color_end': A.RESET} |
|
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345 else: |
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346 return '%s%s%s' % (start, message, A.RESET) |
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347 |
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348 @staticmethod |
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349 def getProfile(): |
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350 """Try to find profile value using introspection""" |
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351 raise NotImplementedError |
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352 |
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353 |
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354 class ConfigureCustom(ConfigureBase): |
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355 LOGGER_CLASS = None |
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356 |
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357 def __init__(self, logger_class, *args, **kwargs): |
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358 ConfigureCustom.LOGGER_CLASS = logger_class |
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359 |
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360 |
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361 configure_cls = { None: ConfigureBase, |
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362 C.LOG_BACKEND_CUSTOM: ConfigureCustom |
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363 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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364 |
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365 |
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366 def configure(backend_, **options): |
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367 """Configure logging behaviour |
| 991 | 368 @param backend: can be: |
| 369 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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370 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 371 """ |
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372 global backend |
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373 if backend is not None: |
| 991 | 374 raise exceptions.InternalError("Logging can only be configured once") |
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375 backend = backend_ |
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376 |
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377 try: |
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378 configure_class = configure_cls[backend] |
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379 except KeyError: |
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380 raise ValueError("unknown backend [{}]".format(backend)) |
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381 if backend == C.LOG_BACKEND_CUSTOM: |
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382 logger_class = options.pop('logger_class') |
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383 configure_class(logger_class, **options) |
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384 else: |
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385 configure_class(**options) |
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386 |
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387 def memoryGet(size=None): |
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388 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
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389 raise ValueError('memory output is not used') |
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390 return configure_cls[backend].memoryGet(size) |
| 991 | 391 |
| 392 def getLogger(name=C.LOG_BASE_LOGGER): | |
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393 try: |
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394 logger_class = configure_cls[backend].LOGGER_CLASS |
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395 except KeyError: |
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396 raise ValueError("This method should not be called with backend [{}]".format(backend)) |
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397 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 398 |
| 399 _root_logger = getLogger() | |
| 400 | |
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401 def debug(msg, **kwargs): |
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402 _root_logger.debug(msg, **kwargs) |
| 991 | 403 |
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404 def info(msg, **kwargs): |
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405 _root_logger.info(msg, **kwargs) |
| 991 | 406 |
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407 def warning(msg, **kwargs): |
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408 _root_logger.warning(msg, **kwargs) |
| 991 | 409 |
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410 def error(msg, **kwargs): |
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411 _root_logger.error(msg, **kwargs) |
| 991 | 412 |
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413 def critical(msg, **kwargs): |
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414 _root_logger.critical(msg, **kwargs) |