Mercurial > libervia-backend
annotate libervia/backend/core/log.py @ 4279:6276242736c3 default tip @
doc (components): Documentation for the new `Conferences` component:
fix 445
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 05 Jul 2024 17:18:37 +0200 |
| parents | 0d7bb4df2343 |
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| rev | line source |
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| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
| 991 | 3 |
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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 |
| 3997 | 24 from typing import TYPE_CHECKING, Any, Optional, Dict |
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25 |
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26 if TYPE_CHECKING: |
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27 from logging import _ExcInfoType |
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28 else: |
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29 _ExcInfoType = Any |
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30 |
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31 from libervia.backend.core.constants import Const as C |
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32 from libervia.backend.tools.common.ansi import ANSI as A |
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33 from libervia.backend.core import exceptions |
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34 import traceback |
| 991 | 35 |
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36 backend = None |
| 3997 | 37 _loggers: Dict[str, "Logger"] = {} |
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38 handlers = {} |
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39 COLOR_START = "%(color_start)s" |
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40 COLOR_END = "%(color_end)s" |
| 991 | 41 |
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42 |
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43 class Filtered(Exception): |
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44 pass |
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46 |
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47 class Logger: |
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48 """High level logging class""" |
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49 |
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50 fmt = None # format option as given by user (e.g. SAT_LOG_LOGGER) |
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51 filter_name = None # filter to call |
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52 post_treat = None |
| 991 | 53 |
| 54 def __init__(self, name): | |
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55 if isinstance(name, Logger): |
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56 self.copy(name) |
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57 else: |
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58 self._name = name |
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59 |
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60 def copy(self, other): |
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61 """Copy values from other Logger""" |
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62 self.fmt = other.fmt |
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63 self.Filter_name = other.fmt |
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64 self.post_treat = other.post_treat |
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65 self._name = other._name |
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66 |
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67 def add_traceback(self, message): |
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68 tb = traceback.format_exc() |
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69 return message + "\n==== traceback ====\n" + tb |
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70 |
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71 def out( |
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72 self, |
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73 message: object, |
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74 level: Optional[str] = None, |
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75 exc_info: _ExcInfoType = False, |
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76 **kwargs, |
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77 ) -> None: |
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78 """Actually log the message |
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79 |
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80 @param message: formatted message |
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81 """ |
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82 if exc_info: |
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83 message = self.add_traceback(message) |
| 3028 | 84 print(message) |
| 991 | 85 |
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86 def log( |
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87 self, level: str, message: object, exc_info: _ExcInfoType = False, **kwargs |
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88 ) -> None: |
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89 """Print message |
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90 |
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91 @param level: one of C.LOG_LEVELS |
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92 @param message: message to format and print |
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93 """ |
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94 if exc_info: |
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95 message = self.add_traceback(message) |
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96 try: |
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97 formatted = self.format(level, message) |
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98 if self.post_treat is None: |
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99 self.out(formatted, level, **kwargs) |
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100 else: |
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101 self.out(self.post_treat(level, formatted), level, **kwargs) |
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102 except Filtered: |
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103 pass |
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104 |
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105 def format(self, level: str, message: object) -> object: |
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106 """Format message according to Logger.fmt |
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107 |
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108 @param level: one of C.LOG_LEVELS |
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109 @param message: message to format |
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110 @return: formatted message |
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111 |
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112 @raise: Filtered when the message must not be logged |
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113 """ |
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114 if self.fmt is None and self.filter_name is None: |
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115 return message |
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116 record = { |
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117 "name": self._name, |
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118 "message": message, |
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119 "levelname": level, |
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120 } |
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121 try: |
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122 if not self.filter_name.dict_filter(record): |
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123 raise Filtered |
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124 except ( |
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125 AttributeError, |
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126 TypeError, |
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127 ): # XXX: TypeError is here because of a pyjamas bug which need to be fixed (TypeError is raised instead of AttributeError) |
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128 if self.filter_name is not None: |
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129 raise ValueError("Bad filter: filters must have a .filter method") |
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130 try: |
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131 return self.fmt % record |
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132 except TypeError: |
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133 return message |
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134 except KeyError as e: |
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135 if e.args[0] == "profile": |
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136 # XXX: %(profile)s use some magic with introspection, for debugging purpose only *DO NOT* use in production |
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137 record["profile"] = configure_cls[backend].get_profile() |
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138 return self.fmt % record |
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139 else: |
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140 raise e |
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141 |
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142 def debug(self, msg: object, **kwargs) -> None: |
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143 self.log(C.LOG_LVL_DEBUG, msg, **kwargs) |
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145 def info(self, msg: object, **kwargs) -> None: |
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146 self.log(C.LOG_LVL_INFO, msg, **kwargs) |
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148 def warning(self, msg: object, **kwargs) -> None: |
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149 self.log(C.LOG_LVL_WARNING, msg, **kwargs) |
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151 def error(self, msg: object, **kwargs) -> None: |
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152 self.log(C.LOG_LVL_ERROR, msg, **kwargs) |
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154 def critical(self, msg: object, **kwargs) -> None: |
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155 self.log(C.LOG_LVL_CRITICAL, msg, **kwargs) |
| 991 | 156 |
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157 def exception(self, msg: object, exc_info=True, **kwargs) -> None: |
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158 self.log(C.LOG_LVL_ERROR, msg, exc_info=exc_info, **kwargs) |
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159 |
| 991 | 160 |
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161 class FilterName(object): |
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162 """Filter on logger name according to a regex""" |
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163 |
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164 def __init__(self, name_re): |
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165 """Initialise name filter |
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166 |
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167 @param name_re: regular expression used to filter names (using search and not match) |
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168 """ |
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169 assert name_re |
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170 import re |
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171 |
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172 self.name_re = re.compile(name_re) |
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173 |
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174 def filter(self, record): |
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175 if self.name_re.search(record.name) is not None: |
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176 return 1 |
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177 return 0 |
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178 |
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179 def dict_filter(self, dict_record): |
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180 """Filter using a dictionary record |
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181 |
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182 @param dict_record: dictionary with at list a key "name" with logger name |
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183 @return: True if message should be logged |
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184 """ |
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185 |
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186 class LogRecord(object): |
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187 pass |
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188 |
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189 log_record = LogRecord() |
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190 log_record.name = dict_record["name"] |
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191 return self.filter(log_record) == 1 |
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192 |
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193 |
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194 class ConfigureBase: |
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195 LOGGER_CLASS = Logger |
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196 # True if color location is specified in fmt (with COLOR_START) |
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197 _color_location = False |
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198 |
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199 def __init__( |
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200 self, |
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201 level=None, |
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202 fmt=None, |
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203 output=None, |
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204 logger=None, |
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205 colors=False, |
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206 levels_taints_dict=None, |
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207 force_colors=False, |
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208 backend_data=None, |
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209 ): |
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210 """Configure a backend |
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211 |
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212 @param level: one of C.LOG_LEVELS |
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213 @param fmt: format string, pretty much as in std logging. |
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214 Accept the following keywords (maybe more depending on backend): |
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215 - "message" |
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216 - "levelname" |
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217 - "name" (logger name) |
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218 @param logger: if set, use it as a regular expression to filter on logger name. |
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219 Use search to match expression, so ^ or $ can be necessary. |
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220 @param colors: if True use ANSI colors to show log levels |
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221 @param force_colors: if True ANSI colors are used even if stdout is not a tty |
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222 """ |
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223 self.backend_data = backend_data |
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224 self.pre_treatment() |
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225 self.configure_level(level) |
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226 self.configure_format(fmt) |
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227 self.configure_output(output) |
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228 self.configure_logger(logger) |
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229 self.configure_colors(colors, force_colors, levels_taints_dict) |
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230 self.post_treatment() |
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231 self.update_current_logger() |
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232 |
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233 def update_current_logger(self): |
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234 """update existing logger to the class needed for this backend""" |
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235 if self.LOGGER_CLASS is None: |
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236 return |
| 3028 | 237 for name, logger in list(_loggers.items()): |
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238 _loggers[name] = self.LOGGER_CLASS(logger) |
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239 |
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240 def pre_treatment(self): |
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241 pass |
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242 |
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243 def configure_level(self, level): |
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244 if level is not None: |
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245 # we deactivate methods below level |
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246 level_idx = C.LOG_LEVELS.index(level) |
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247 |
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248 def dev_null(self, msg): |
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249 pass |
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250 |
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251 for _level in C.LOG_LEVELS[:level_idx]: |
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252 setattr(Logger, _level.lower(), dev_null) |
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253 |
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254 def configure_format(self, fmt): |
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255 if fmt is not None: |
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256 if fmt != "%(message)s": # %(message)s is the same as None |
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257 Logger.fmt = fmt |
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258 if COLOR_START in fmt: |
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259 ConfigureBase._color_location = True |
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260 if fmt.find(COLOR_END, fmt.rfind(COLOR_START)) < 0: |
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261 # color_start not followed by an end, we add it |
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262 Logger.fmt += COLOR_END |
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263 |
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264 def configure_output(self, output): |
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265 if output is not None: |
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266 if output != C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT: |
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267 # TODO: manage other outputs |
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268 raise NotImplementedError("Basic backend only manage default output yet") |
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269 |
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270 def configure_logger(self, logger): |
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271 if logger: |
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272 Logger.filter_name = FilterName(logger) |
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273 |
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274 def configure_colors(self, colors, force_colors, levels_taints_dict): |
| 1942 | 275 if colors: |
| 276 # if color are used, we need to handle levels_taints_dict | |
| 3028 | 277 for level in list(levels_taints_dict.keys()): |
| 1942 | 278 # we wants levels in uppercase to correspond to contstants |
| 279 levels_taints_dict[level.upper()] = levels_taints_dict[level] | |
| 280 taints = self.__class__.taints = {} | |
| 281 for level in C.LOG_LEVELS: | |
| 282 # we want use values and use constant value as default | |
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283 taint_list = levels_taints_dict.get( |
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284 level, C.LOG_OPT_TAINTS_DICT[1][level] |
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285 ) |
| 1942 | 286 ansi_list = [] |
| 287 for elt in taint_list: | |
| 288 elt = elt.upper() | |
| 289 try: | |
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290 ansi = getattr(A, "FG_{}".format(elt)) |
| 1942 | 291 except AttributeError: |
| 292 try: | |
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293 ansi = getattr(A, elt) |
| 1942 | 294 except AttributeError: |
| 295 # we use raw string if element is unknown | |
| 296 ansi = elt | |
| 297 ansi_list.append(ansi) | |
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298 taints[level] = "".join(ansi_list) |
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299 |
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300 def post_treatment(self): |
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301 pass |
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302 |
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303 def manage_outputs(self, outputs_raw): |
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304 """Parse output option in a backend agnostic way, and fill handlers consequently |
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305 |
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306 @param outputs_raw: output option as enterred in environment variable or in configuration |
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307 """ |
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308 if not outputs_raw: |
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309 return |
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310 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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311 global handlers |
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312 if len(outputs) == 1: |
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313 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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314 |
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315 for output in outputs: |
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316 if not output: |
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317 continue |
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318 if output[-1] == ")": |
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319 # we have options |
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320 opt_begin = output.rfind("(") |
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321 options = output[opt_begin + 1 : -1] |
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322 output = output[:opt_begin] |
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323 else: |
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324 options = None |
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325 |
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326 if output not in ( |
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327 C.LOG_OPT_OUTPUT_DEFAULT, |
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328 C.LOG_OPT_OUTPUT_FILE, |
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329 C.LOG_OPT_OUTPUT_MEMORY, |
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330 ): |
| 3028 | 331 raise ValueError("Invalid output [%s]" % output) |
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332 |
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333 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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334 # no option for defaut handler |
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335 handlers[output] = None |
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336 elif output == C.LOG_OPT_OUTPUT_FILE: |
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337 if not options: |
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338 ValueError( |
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339 "{handler} output need a path as option".format(handle=output) |
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340 ) |
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341 handlers.setdefault(output, []).append(options) |
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342 options = None # option are parsed, we can empty them |
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343 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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344 # we have memory handler, option can be the len limit or None |
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345 try: |
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346 limit = int(options) |
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347 options = None # option are parsed, we can empty them |
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348 except (TypeError, ValueError): |
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349 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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350 handlers[output] = limit |
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351 |
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352 if options: # we should not have unparsed options |
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353 raise ValueError( |
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354 "options [{options}] are not supported for {handler} output".format( |
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355 options=options, handler=output |
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356 ) |
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357 ) |
|
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358 |
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359 @staticmethod |
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360 def memory_get(size=None): |
|
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361 """Return buffered logs |
|
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362 |
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363 @param size: number of logs to return |
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364 """ |
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365 raise NotImplementedError |
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366 |
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367 @classmethod |
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368 def ansi_colors(cls, level, message): |
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369 """Colorise message depending on level for terminals |
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370 |
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371 @param level: one of C.LOG_LEVELS |
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372 @param message: formatted message to log |
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373 @return: message with ANSI escape codes for coloration |
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374 """ |
| 1942 | 375 |
| 376 try: | |
| 377 start = cls.taints[level] | |
| 378 except KeyError: | |
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379 start = "" |
| 1942 | 380 |
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381 if cls._color_location: |
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382 return message % {"color_start": start, "color_end": A.RESET} |
|
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383 else: |
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384 return "%s%s%s" % (start, message, A.RESET) |
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385 |
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386 @staticmethod |
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387 def get_profile(): |
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388 """Try to find profile value using introspection""" |
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389 raise NotImplementedError |
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390 |
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391 |
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392 class ConfigureCustom(ConfigureBase): |
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393 LOGGER_CLASS = None |
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394 |
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395 def __init__(self, logger_class, *args, **kwargs): |
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396 ConfigureCustom.LOGGER_CLASS = logger_class |
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397 |
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398 |
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399 configure_cls = { |
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400 None: ConfigureBase, |
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401 C.LOG_BACKEND_CUSTOM: ConfigureCustom, |
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402 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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403 |
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404 |
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405 def configure(backend_, **options): |
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406 """Configure logging behaviour |
| 991 | 407 @param backend: can be: |
| 408 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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409 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 410 """ |
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411 global backend |
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412 if backend is not None: |
| 991 | 413 raise exceptions.InternalError("Logging can only be configured once") |
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414 backend = backend_ |
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415 |
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416 try: |
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417 configure_class = configure_cls[backend] |
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418 except KeyError: |
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419 raise ValueError("unknown backend [{}]".format(backend)) |
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420 if backend == C.LOG_BACKEND_CUSTOM: |
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421 logger_class = options.pop("logger_class") |
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422 configure_class(logger_class, **options) |
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423 else: |
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424 configure_class(**options) |
|
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425 |
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426 |
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427 def memory_get(size=None): |
|
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428 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
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429 raise ValueError("memory output is not used") |
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430 return configure_cls[backend].memory_get(size) |
| 991 | 431 |
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432 |
| 3997 | 433 def getLogger(name=C.LOG_BASE_LOGGER) -> Logger: |
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434 try: |
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435 logger_class = configure_cls[backend].LOGGER_CLASS |
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436 except KeyError: |
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437 raise ValueError( |
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438 "This method should not be called with backend [{}]".format(backend) |
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439 ) |
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440 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 441 |
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442 |
| 991 | 443 _root_logger = getLogger() |
| 444 | |
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445 |
|
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446 def debug(msg, **kwargs): |
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447 _root_logger.debug(msg, **kwargs) |
| 991 | 448 |
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449 |
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450 def info(msg, **kwargs): |
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451 _root_logger.info(msg, **kwargs) |
| 991 | 452 |
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453 |
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454 def warning(msg, **kwargs): |
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455 _root_logger.warning(msg, **kwargs) |
| 991 | 456 |
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457 |
|
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458 def error(msg, **kwargs): |
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459 _root_logger.error(msg, **kwargs) |
| 991 | 460 |
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461 |
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462 def critical(msg, **kwargs): |
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463 _root_logger.critical(msg, **kwargs) |