Mercurial > libervia-backend
annotate sat/core/log.py @ 2835:6aa22011bc6d
tools (config): log error message if config can't be read
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 03 Mar 2019 08:57:36 +0100 |
| parents | 003b8b4b56a7 |
| children | ad00f61fd9f5 |
| rev | line source |
|---|---|
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use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2 |
| 991 | 2 # -*- coding: utf-8 -*- |
| 3 | |
| 4 # SàT: a XMPP client | |
| 2771 | 5 # Copyright (C) 2009-2019 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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core (logs): log color location can now be specified with %(color_start)s and %(color_end)s
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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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core (constants), tools (common/ansi): moved ANSI escape codes to a dedicated class, with helper methods
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25 from sat.tools.common.ansi import ANSI as A |
| 991 | 26 from sat.core import exceptions |
| 27 | |
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28 backend = None |
| 991 | 29 _loggers = {} |
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30 handlers = {} |
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31 COLOR_START = '%(color_start)s' |
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32 COLOR_END = '%(color_end)s' |
| 991 | 33 |
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34 |
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35 class Filtered(Exception): |
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36 pass |
| 991 | 37 |
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38 |
| 991 | 39 class Logger(object): |
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40 """High level logging class""" |
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41 fmt = None # format option as given by user (e.g. SAT_LOG_LOGGER) |
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42 filter_name = None # filter to call |
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43 post_treat = None |
| 991 | 44 |
| 45 def __init__(self, name): | |
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46 if isinstance(name, Logger): |
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47 self.copy(name) |
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48 else: |
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49 self._name = name |
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50 |
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51 def copy(self, other): |
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52 """Copy values from other Logger""" |
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53 self.fmt = other.fmt |
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54 self.Filter_name = other.fmt |
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55 self.post_treat = other.post_treat |
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56 self._name = other._name |
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57 |
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58 def out(self, message, level=None): |
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59 """Actually log the message |
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60 |
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61 @param message: formatted message |
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62 """ |
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63 print message |
| 991 | 64 |
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65 def log(self, level, message): |
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66 """Print message |
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67 |
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68 @param level: one of C.LOG_LEVELS |
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69 @param message: message to format and print |
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70 """ |
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71 try: |
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72 formatted = self.format(level, message) |
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73 if self.post_treat is None: |
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74 self.out(formatted, level) |
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75 else: |
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76 self.out(self.post_treat(level, formatted), level) |
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77 except Filtered: |
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78 pass |
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79 |
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80 def format(self, level, message): |
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81 """Format message according to Logger.fmt |
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82 |
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83 @param level: one of C.LOG_LEVELS |
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84 @param message: message to format |
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85 @return: formatted message |
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86 |
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87 @raise: Filtered when the message must not be logged |
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88 """ |
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89 if self.fmt is None and self.filter_name is None: |
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90 return message |
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91 record = {'name': self._name, |
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92 'message': message, |
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93 'levelname': level, |
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94 } |
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95 try: |
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96 if not self.filter_name.dictFilter(record): |
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97 raise Filtered |
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98 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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99 if self.filter_name is not None: |
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100 raise ValueError("Bad filter: filters must have a .filter method") |
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101 try: |
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102 return self.fmt % record |
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103 except TypeError: |
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104 return message |
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105 except KeyError as e: |
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106 if e.args[0] == 'profile': |
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107 # XXX: %(profile)s use some magic with introspection, for debugging purpose only *DO NOT* use in production |
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108 record['profile'] = configure_cls[backend].getProfile() |
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109 return self.fmt % record |
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110 else: |
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111 raise e |
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112 |
| 991 | 113 def debug(self, msg): |
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114 self.log(C.LOG_LVL_DEBUG, msg) |
| 991 | 115 |
| 116 def info(self, msg): | |
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117 self.log(C.LOG_LVL_INFO, msg) |
| 991 | 118 |
| 119 def warning(self, msg): | |
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120 self.log(C.LOG_LVL_WARNING, msg) |
| 991 | 121 |
| 122 def error(self, msg): | |
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123 self.log(C.LOG_LVL_ERROR, msg) |
| 991 | 124 |
| 125 def critical(self, msg): | |
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126 self.log(C.LOG_LVL_CRITICAL, msg) |
| 991 | 127 |
| 128 | |
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129 class FilterName(object): |
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130 """Filter on logger name according to a regex""" |
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131 |
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132 def __init__(self, name_re): |
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133 """Initialise name filter |
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134 |
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135 @param name_re: regular expression used to filter names (using search and not match) |
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136 """ |
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137 assert name_re |
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138 import re |
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139 self.name_re = re.compile(name_re) |
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140 |
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141 def filter(self, record): |
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142 if self.name_re.search(record.name) is not None: |
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143 return 1 |
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144 return 0 |
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145 |
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146 def dictFilter(self, dict_record): |
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147 """Filter using a dictionary record |
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148 |
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149 @param dict_record: dictionary with at list a key "name" with logger name |
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150 @return: True if message should be logged |
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151 """ |
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152 class LogRecord(object): |
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153 pass |
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154 log_record = LogRecord() |
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155 log_record.name = dict_record['name'] |
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156 return self.filter(log_record) == 1 |
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157 |
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158 |
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159 class ConfigureBase(object): |
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160 LOGGER_CLASS = Logger |
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161 # True if color location is specified in fmt (with COLOR_START) |
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162 _color_location = False |
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163 |
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164 def __init__(self, level=None, fmt=None, output=None, logger=None, colors=False, |
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165 levels_taints_dict=None, force_colors=False, backend_data=None): |
|
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166 """Configure a backend |
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167 |
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168 @param level: one of C.LOG_LEVELS |
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169 @param fmt: format string, pretty much as in std logging. |
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170 Accept the following keywords (maybe more depending on backend): |
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171 - "message" |
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172 - "levelname" |
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173 - "name" (logger name) |
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174 @param logger: if set, use it as a regular expression to filter on logger name. |
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175 Use search to match expression, so ^ or $ can be necessary. |
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176 @param colors: if True use ANSI colors to show log levels |
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177 @param force_colors: if True ANSI colors are used even if stdout is not a tty |
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178 """ |
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179 self.backend_data = backend_data |
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180 self.preTreatment() |
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181 self.configureLevel(level) |
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182 self.configureFormat(fmt) |
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183 self.configureOutput(output) |
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184 self.configureLogger(logger) |
| 1942 | 185 self.configureColors(colors, force_colors, levels_taints_dict) |
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186 self.postTreatment() |
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187 self.updateCurrentLogger() |
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188 |
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189 def updateCurrentLogger(self): |
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190 """update existing logger to the class needed for this backend""" |
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191 if self.LOGGER_CLASS is None: |
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192 return |
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193 for name, logger in _loggers.items(): |
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194 _loggers[name] = self.LOGGER_CLASS(logger) |
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195 |
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196 def preTreatment(self): |
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197 pass |
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198 |
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199 def configureLevel(self, level): |
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200 if level is not None: |
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201 # we deactivate methods below level |
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202 level_idx = C.LOG_LEVELS.index(level) |
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203 def dev_null(self, msg): |
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204 pass |
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205 for _level in C.LOG_LEVELS[:level_idx]: |
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206 setattr(Logger, _level.lower(), dev_null) |
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207 |
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208 def configureFormat(self, fmt): |
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209 if fmt is not None: |
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210 if fmt != '%(message)s': # %(message)s is the same as None |
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211 Logger.fmt = fmt |
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212 if COLOR_START in fmt: |
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213 ConfigureBase._color_location = True |
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214 if fmt.find(COLOR_END,fmt.rfind(COLOR_START))<0: |
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215 # color_start not followed by an end, we add it |
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216 Logger.fmt += COLOR_END |
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217 |
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218 def configureOutput(self, output): |
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219 if output is not None: |
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220 if output != C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT: |
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221 # TODO: manage other outputs |
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222 raise NotImplementedError("Basic backend only manage default output yet") |
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223 |
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224 def configureLogger(self, logger): |
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225 if logger: |
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226 Logger.filter_name = FilterName(logger) |
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227 |
| 1942 | 228 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 229 if colors: | |
| 230 # if color are used, we need to handle levels_taints_dict | |
| 231 for level in levels_taints_dict.keys(): | |
| 232 # we wants levels in uppercase to correspond to contstants | |
| 233 levels_taints_dict[level.upper()] = levels_taints_dict[level] | |
| 234 taints = self.__class__.taints = {} | |
| 235 for level in C.LOG_LEVELS: | |
| 236 # we want use values and use constant value as default | |
| 237 taint_list = levels_taints_dict.get(level, C.LOG_OPT_TAINTS_DICT[1][level]) | |
| 238 ansi_list = [] | |
| 239 for elt in taint_list: | |
| 240 elt = elt.upper() | |
| 241 try: | |
|
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242 ansi = getattr(A, 'FG_{}'.format(elt)) |
| 1942 | 243 except AttributeError: |
| 244 try: | |
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245 ansi = getattr(A, elt) |
| 1942 | 246 except AttributeError: |
| 247 # we use raw string if element is unknown | |
| 248 ansi = elt | |
| 249 ansi_list.append(ansi) | |
| 250 taints[level] = ''.join(ansi_list) | |
|
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251 |
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252 def postTreatment(self): |
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253 pass |
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254 |
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255 def manageOutputs(self, outputs_raw): |
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256 """ Parse output option in a backend agnostic way, and fill handlers consequently |
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257 |
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258 @param outputs_raw: output option as enterred in environment variable or in configuration |
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259 """ |
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260 if not outputs_raw: |
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261 return |
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262 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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263 global handlers |
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264 if len(outputs) == 1: |
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265 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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266 |
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267 for output in outputs: |
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268 if not output: |
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269 continue |
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270 if output[-1] == ')': |
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271 # we have options |
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272 opt_begin = output.rfind('(') |
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273 options = output[opt_begin+1:-1] |
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274 output = output[:opt_begin] |
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275 else: |
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276 options = None |
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277 |
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278 if output not in (C.LOG_OPT_OUTPUT_DEFAULT, C.LOG_OPT_OUTPUT_FILE, C.LOG_OPT_OUTPUT_MEMORY): |
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279 raise ValueError(u"Invalid output [%s]" % output) |
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280 |
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281 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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282 # no option for defaut handler |
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283 handlers[output] = None |
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284 elif output == C.LOG_OPT_OUTPUT_FILE: |
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285 if not options: |
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286 ValueError("{handler} output need a path as option" .format(handle=output)) |
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287 handlers.setdefault(output, []).append(options) |
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288 options = None # option are parsed, we can empty them |
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289 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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290 # we have memory handler, option can be the len limit or None |
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291 try: |
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292 limit = int(options) |
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293 options = None # option are parsed, we can empty them |
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294 except (TypeError, ValueError): |
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295 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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296 handlers[output] = limit |
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297 |
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298 if options: # we should not have unparsed options |
|
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299 raise ValueError(u"options [{options}] are not supported for {handler} output".format(options=options, handler=output)) |
|
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300 |
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301 @staticmethod |
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302 def memoryGet(size=None): |
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303 """Return buffered logs |
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304 |
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305 @param size: number of logs to return |
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306 """ |
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307 raise NotImplementedError |
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308 |
|
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309 @classmethod |
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310 def ansiColors(cls, level, message): |
|
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311 """Colorise message depending on level for terminals |
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312 |
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313 @param level: one of C.LOG_LEVELS |
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314 @param message: formatted message to log |
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315 @return: message with ANSI escape codes for coloration |
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316 """ |
| 1942 | 317 |
| 318 try: | |
| 319 start = cls.taints[level] | |
| 320 except KeyError: | |
| 321 start = '' | |
| 322 | |
|
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323 if cls._color_location: |
| 1942 | 324 return message % {'color_start': start, |
|
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325 'color_end': A.RESET} |
|
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326 else: |
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327 return '%s%s%s' % (start, message, A.RESET) |
|
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328 |
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329 @staticmethod |
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330 def getProfile(): |
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331 """Try to find profile value using introspection""" |
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332 raise NotImplementedError |
|
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333 |
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334 |
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335 class ConfigureCustom(ConfigureBase): |
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336 LOGGER_CLASS = None |
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337 |
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338 def __init__(self, logger_class, *args, **kwargs): |
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339 ConfigureCustom.LOGGER_CLASS = logger_class |
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340 |
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341 |
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342 configure_cls = { None: ConfigureBase, |
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343 C.LOG_BACKEND_CUSTOM: ConfigureCustom |
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344 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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345 |
|
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346 |
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347 def configure(backend_, **options): |
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348 """Configure logging behaviour |
| 991 | 349 @param backend: can be: |
| 350 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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351 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 352 """ |
|
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353 global backend |
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354 if backend is not None: |
| 991 | 355 raise exceptions.InternalError("Logging can only be configured once") |
|
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356 backend = backend_ |
|
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357 |
|
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358 try: |
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359 configure_class = configure_cls[backend] |
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360 except KeyError: |
|
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361 raise ValueError("unknown backend [{}]".format(backend)) |
|
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362 if backend == C.LOG_BACKEND_CUSTOM: |
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363 logger_class = options.pop('logger_class') |
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364 configure_class(logger_class, **options) |
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365 else: |
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366 configure_class(**options) |
|
994
652c01ca69b1
core (log): configuration and environment variables are now checked for log level and colors:
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|
367 |
|
1021
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
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368 def memoryGet(size=None): |
|
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
|
369 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
|
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
|
370 raise ValueError('memory output is not used') |
|
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
|
371 return configure_cls[backend].memoryGet(size) |
| 991 | 372 |
| 373 def getLogger(name=C.LOG_BASE_LOGGER): | |
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1021
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
|
374 try: |
|
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
|
375 logger_class = configure_cls[backend].LOGGER_CLASS |
|
a836b6da2c5c
core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
Goffi <goffi@goffi.org>
parents:
1017
diff
changeset
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376 except KeyError: |
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1940
3fdacba9da68
core (logs): log color location can now be specified with %(color_start)s and %(color_end)s
Goffi <goffi@goffi.org>
parents:
1934
diff
changeset
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377 raise ValueError("This method should not be called with backend [{}]".format(backend)) |
|
1007
a7d33c7a8277
core (log): refactoring + twisted backend:
Goffi <goffi@goffi.org>
parents:
1006
diff
changeset
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378 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 379 |
| 380 _root_logger = getLogger() | |
| 381 | |
| 382 def debug(msg): | |
| 383 _root_logger.debug(msg) | |
| 384 | |
| 385 def info(msg): | |
| 386 _root_logger.info(msg) | |
| 387 | |
| 388 def warning(msg): | |
| 389 _root_logger.warning(msg) | |
| 390 | |
| 391 def error(msg): | |
| 392 _root_logger.error(msg) | |
| 393 | |
| 394 def critical(msg): | |
| 395 _root_logger.critical(msg) |