Mercurial > libervia-backend
annotate src/core/log.py @ 1983:8c4087fd034a
quick_frontend: allow presence of entities without resource
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 29 Jun 2016 13:42:35 +0200 |
| parents | 7f053e1f0b67 |
| children | 7cbffd754b4a |
| 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 | |
| 1766 | 5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org) |
| 991 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 """High level logging functions""" | |
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21 # XXX: this module use standard logging module when possible, but as SàT can work in different cases where logging is not the best choice (twisted, pyjamas, etc), it is necessary to have a dedicated module. Additional feature like environment variables and colors are also managed. |
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22 # TODO: change formatting from "%s" style to "{}" when moved to Python 3 |
| 991 | 23 |
| 24 from sat.core.constants import Const as C | |
| 25 from sat.core import exceptions | |
| 26 | |
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27 backend = None |
| 991 | 28 _loggers = {} |
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29 handlers = {} |
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30 COLOR_START = '%(color_start)s' |
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31 COLOR_END = '%(color_end)s' |
| 991 | 32 |
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33 |
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34 class Filtered(Exception): |
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35 pass |
| 991 | 36 |
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37 |
| 991 | 38 class Logger(object): |
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39 """High level logging class""" |
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40 fmt = None # format option as given by user (e.g. SAT_LOG_LOGGER) |
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41 filter_name = None # filter to call |
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42 post_treat = None |
| 991 | 43 |
| 44 def __init__(self, name): | |
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45 if isinstance(name, Logger): |
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46 self.copy(name) |
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47 else: |
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48 self._name = name |
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49 |
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50 def copy(self, other): |
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51 """Copy values from other Logger""" |
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52 self.fmt = other.fmt |
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53 self.Filter_name = other.fmt |
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54 self.post_treat = other.post_treat |
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55 self._name = other._name |
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56 |
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57 def out(self, message, level=None): |
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58 """Actually log the message |
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59 |
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60 @param message: formatted message |
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61 """ |
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62 print message |
| 991 | 63 |
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64 def log(self, level, message): |
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65 """Print message |
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66 |
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67 @param level: one of C.LOG_LEVELS |
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68 @param message: message to format and print |
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69 """ |
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70 try: |
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71 formatted = self.format(level, message) |
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72 if self.post_treat is None: |
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73 self.out(formatted, level) |
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74 else: |
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75 self.out(self.post_treat(level, formatted), level) |
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76 except Filtered: |
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77 pass |
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78 |
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79 def format(self, level, message): |
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80 """Format message according to Logger.fmt |
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81 |
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82 @param level: one of C.LOG_LEVELS |
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83 @param message: message to format |
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84 @return: formatted message |
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85 |
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86 @raise: Filtered when the message must not be logged |
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87 """ |
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88 if self.fmt is None and self.filter_name is None: |
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89 return message |
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90 record = {'name': self._name, |
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91 'message': message, |
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92 'levelname': level, |
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93 } |
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94 try: |
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95 if not self.filter_name.dictFilter(record): |
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96 raise Filtered |
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97 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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98 if self.filter_name is not None: |
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99 raise ValueError("Bad filter: filters must have a .filter method") |
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100 try: |
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101 return self.fmt % record |
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102 except TypeError: |
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103 return message |
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104 except KeyError as e: |
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105 if e.args[0] == 'profile': |
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106 # XXX: %(profile)s use some magic with introspection, for debugging purpose only *DO NOT* use in production |
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107 record['profile'] = configure_cls[backend].getProfile() |
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108 return self.fmt % record |
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109 else: |
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110 raise e |
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111 |
| 991 | 112 def debug(self, msg): |
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113 self.log(C.LOG_LVL_DEBUG, msg) |
| 991 | 114 |
| 115 def info(self, msg): | |
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116 self.log(C.LOG_LVL_INFO, msg) |
| 991 | 117 |
| 118 def warning(self, msg): | |
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119 self.log(C.LOG_LVL_WARNING, msg) |
| 991 | 120 |
| 121 def error(self, msg): | |
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122 self.log(C.LOG_LVL_ERROR, msg) |
| 991 | 123 |
| 124 def critical(self, msg): | |
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125 self.log(C.LOG_LVL_CRITICAL, msg) |
| 991 | 126 |
| 127 | |
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128 class FilterName(object): |
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129 """Filter on logger name according to a regex""" |
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130 |
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131 def __init__(self, name_re): |
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132 """Initialise name filter |
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133 |
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134 @param name_re: regular expression used to filter names (using search and not match) |
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135 """ |
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136 assert name_re |
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137 import re |
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138 self.name_re = re.compile(name_re) |
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139 |
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140 def filter(self, record): |
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141 if self.name_re.search(record.name) is not None: |
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142 return 1 |
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143 return 0 |
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144 |
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145 def dictFilter(self, dict_record): |
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146 """Filter using a dictionary record |
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147 |
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148 @param dict_record: dictionary with at list a key "name" with logger name |
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149 @return: True if message should be logged |
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150 """ |
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151 class LogRecord(object): |
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152 pass |
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153 log_record = LogRecord() |
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154 log_record.name = dict_record['name'] |
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155 return self.filter(log_record) == 1 |
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156 |
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157 |
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158 class ConfigureBase(object): |
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159 LOGGER_CLASS = Logger |
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160 _color_location = False # True if color location is specified in fmt (with COLOR_START) |
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161 |
| 1942 | 162 def __init__(self, level=None, fmt=None, output=None, logger=None, colors=False, levels_taints_dict=None, force_colors=False, backend_data=None): |
|
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163 """Configure a backend |
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164 |
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165 @param level: one of C.LOG_LEVELS |
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166 @param fmt: format string, pretty much as in std logging. Accept the following keywords (maybe more depending on backend): |
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167 - "message" |
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168 - "levelname" |
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169 - "name" (logger name) |
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170 @param logger: if set, use it as a regular expression to filter on logger name. |
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171 Use search to match expression, so ^ or $ can be necessary. |
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172 @param colors: if True use ANSI colors to show log levels |
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173 @param force_colors: if True ANSI colors are used even if stdout is not a tty |
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174 """ |
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175 self.backend_data = backend_data |
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176 self.preTreatment() |
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177 self.configureLevel(level) |
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178 self.configureFormat(fmt) |
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179 self.configureOutput(output) |
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180 self.configureLogger(logger) |
| 1942 | 181 self.configureColors(colors, force_colors, levels_taints_dict) |
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182 self.postTreatment() |
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183 self.updateCurrentLogger() |
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184 |
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185 def updateCurrentLogger(self): |
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186 """update existing logger to the class needed for this backend""" |
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187 if self.LOGGER_CLASS is None: |
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188 return |
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189 for name, logger in _loggers.items(): |
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190 _loggers[name] = self.LOGGER_CLASS(logger) |
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191 |
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192 def preTreatment(self): |
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193 pass |
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194 |
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195 def configureLevel(self, level): |
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196 if level is not None: |
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197 # we deactivate methods below level |
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198 level_idx = C.LOG_LEVELS.index(level) |
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199 def dev_null(self, msg): |
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200 pass |
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201 for _level in C.LOG_LEVELS[:level_idx]: |
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202 setattr(Logger, _level.lower(), dev_null) |
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203 |
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204 def configureFormat(self, fmt): |
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205 if fmt is not None: |
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206 if fmt != '%(message)s': # %(message)s is the same as None |
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207 Logger.fmt = fmt |
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208 if COLOR_START in fmt: |
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209 ConfigureBase._color_location = True |
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210 if fmt.find(COLOR_END,fmt.rfind(COLOR_START))<0: |
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211 # color_start not followed by an end, we add it |
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212 Logger.fmt += COLOR_END |
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213 |
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214 def configureOutput(self, output): |
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215 if output is not None: |
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216 if output != C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT: |
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217 # TODO: manage other outputs |
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218 raise NotImplementedError("Basic backend only manage default output yet") |
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219 |
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220 def configureLogger(self, logger): |
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221 if logger: |
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222 Logger.filter_name = FilterName(logger) |
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223 |
| 1942 | 224 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 225 if colors: | |
| 226 # if color are used, we need to handle levels_taints_dict | |
| 227 for level in levels_taints_dict.keys(): | |
| 228 # we wants levels in uppercase to correspond to contstants | |
| 229 levels_taints_dict[level.upper()] = levels_taints_dict[level] | |
| 230 taints = self.__class__.taints = {} | |
| 231 for level in C.LOG_LEVELS: | |
| 232 # we want use values and use constant value as default | |
| 233 taint_list = levels_taints_dict.get(level, C.LOG_OPT_TAINTS_DICT[1][level]) | |
| 234 ansi_list = [] | |
| 235 for elt in taint_list: | |
| 236 elt = elt.upper() | |
| 237 try: | |
| 238 ansi = getattr(C, 'ANSI_FG_{}'.format(elt)) | |
| 239 except AttributeError: | |
| 240 try: | |
| 241 ansi = getattr(C, 'ANSI_{}'.format(elt)) | |
| 242 except AttributeError: | |
| 243 # we use raw string if element is unknown | |
| 244 ansi = elt | |
| 245 ansi_list.append(ansi) | |
| 246 taints[level] = ''.join(ansi_list) | |
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247 |
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248 def postTreatment(self): |
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249 pass |
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250 |
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251 def manageOutputs(self, outputs_raw): |
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252 """ Parse output option in a backend agnostic way, and fill handlers consequently |
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253 |
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254 @param outputs_raw: output option as enterred in environment variable or in configuration |
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255 """ |
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256 if not outputs_raw: |
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257 return |
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258 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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259 global handlers |
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260 if len(outputs) == 1: |
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261 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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262 |
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263 for output in outputs: |
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264 if not output: |
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265 continue |
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266 if output[-1] == ')': |
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267 # we have options |
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268 opt_begin = output.rfind('(') |
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269 options = output[opt_begin+1:-1] |
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270 output = output[:opt_begin] |
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271 else: |
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272 options = None |
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273 |
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274 if output not in (C.LOG_OPT_OUTPUT_DEFAULT, C.LOG_OPT_OUTPUT_FILE, C.LOG_OPT_OUTPUT_MEMORY): |
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275 raise ValueError(u"Invalid output [%s]" % output) |
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276 |
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277 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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278 # no option for defaut handler |
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279 handlers[output] = None |
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280 elif output == C.LOG_OPT_OUTPUT_FILE: |
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281 if not options: |
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282 ValueError("{handler} output need a path as option" .format(handle=output)) |
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283 handlers.setdefault(output, []).append(options) |
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284 options = None # option are parsed, we can empty them |
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285 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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286 # we have memory handler, option can be the len limit or None |
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287 try: |
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288 limit = int(options) |
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289 options = None # option are parsed, we can empty them |
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290 except (TypeError, ValueError): |
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291 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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292 handlers[output] = limit |
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293 |
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294 if options: # we should not have unparsed options |
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295 raise ValueError(u"options [{options}] are not supported for {handler} output".format(options=options, handler=output)) |
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296 |
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297 @staticmethod |
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298 def memoryGet(size=None): |
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299 """Return buffered logs |
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300 |
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301 @param size: number of logs to return |
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302 """ |
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303 raise NotImplementedError |
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304 |
|
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305 @classmethod |
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306 def ansiColors(cls, level, message): |
|
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307 """Colorise message depending on level for terminals |
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308 |
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309 @param level: one of C.LOG_LEVELS |
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310 @param message: formatted message to log |
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311 @return: message with ANSI escape codes for coloration |
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312 """ |
| 1942 | 313 |
| 314 try: | |
| 315 start = cls.taints[level] | |
| 316 except KeyError: | |
| 317 start = '' | |
| 318 | |
|
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319 if cls._color_location: |
| 1942 | 320 return message % {'color_start': start, |
|
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321 'color_end': C.ANSI_RESET} |
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322 else: |
| 1942 | 323 return '%s%s%s' % (start, message, C.ANSI_RESET) |
|
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324 |
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325 @staticmethod |
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326 def getProfile(): |
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327 """Try to find profile value using introspection""" |
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328 raise NotImplementedError |
|
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329 |
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330 |
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331 class ConfigureCustom(ConfigureBase): |
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332 LOGGER_CLASS = None |
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333 |
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334 def __init__(self, logger_class, *args, **kwargs): |
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335 ConfigureCustom.LOGGER_CLASS = logger_class |
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336 |
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337 |
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338 configure_cls = { None: ConfigureBase, |
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339 C.LOG_BACKEND_CUSTOM: ConfigureCustom |
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340 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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341 |
|
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342 |
|
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343 def configure(backend_, **options): |
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344 """Configure logging behaviour |
| 991 | 345 @param backend: can be: |
| 346 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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347 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 348 """ |
|
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349 global backend |
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350 if backend is not None: |
| 991 | 351 raise exceptions.InternalError("Logging can only be configured once") |
|
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352 backend = backend_ |
|
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353 |
|
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354 try: |
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355 configure_class = configure_cls[backend] |
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356 except KeyError: |
|
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357 raise ValueError("unknown backend [{}]".format(backend)) |
|
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358 if backend == C.LOG_BACKEND_CUSTOM: |
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359 logger_class = options.pop('logger_class') |
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360 configure_class(logger_class, **options) |
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361 else: |
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362 configure_class(**options) |
|
994
652c01ca69b1
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363 |
|
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364 def memoryGet(size=None): |
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365 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
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366 raise ValueError('memory output is not used') |
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367 return configure_cls[backend].memoryGet(size) |
| 991 | 368 |
| 369 def getLogger(name=C.LOG_BASE_LOGGER): | |
|
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370 try: |
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371 logger_class = configure_cls[backend].LOGGER_CLASS |
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372 except KeyError: |
|
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
|
373 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
|
374 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 375 |
| 376 _root_logger = getLogger() | |
| 377 | |
| 378 def debug(msg): | |
| 379 _root_logger.debug(msg) | |
| 380 | |
| 381 def info(msg): | |
| 382 _root_logger.info(msg) | |
| 383 | |
| 384 def warning(msg): | |
| 385 _root_logger.warning(msg) | |
| 386 | |
| 387 def error(msg): | |
| 388 _root_logger.error(msg) | |
| 389 | |
| 390 def critical(msg): | |
| 391 _root_logger.critical(msg) |