Mercurial > libervia-backend
annotate src/core/log.py @ 1940:3fdacba9da68
core (logs): log color location can now be specified with %(color_start)s and %(color_end)s
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Mon, 18 Apr 2016 18:33:59 +0200 |
| parents | 2daf7b4c6756 |
| children | 7f053e1f0b67 |
| rev | line source |
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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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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 | |
| 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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core (logs): log color location can now be specified with %(color_start)s and %(color_end)s
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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 |
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162 def __init__(self, level=None, fmt=None, output=None, logger=None, colors=False, 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) |
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181 self.configureColors(colors, force_colors) |
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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 |
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224 def configureColors(self, colors, force_colors): |
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225 pass |
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226 |
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227 def postTreatment(self): |
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228 pass |
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229 |
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230 def manageOutputs(self, outputs_raw): |
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231 """ Parse output option in a backend agnostic way, and fill handlers consequently |
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232 |
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233 @param outputs_raw: output option as enterred in environment variable or in configuration |
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234 """ |
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235 if not outputs_raw: |
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236 return |
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237 outputs = outputs_raw.split(C.LOG_OPT_OUTPUT_SEP) |
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238 global handlers |
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239 if len(outputs) == 1: |
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240 handlers[C.LOG_OPT_OUTPUT_FILE] = [outputs.pop()] |
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241 |
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242 for output in outputs: |
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243 if not output: |
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244 continue |
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245 if output[-1] == ')': |
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246 # we have options |
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247 opt_begin = output.rfind('(') |
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248 options = output[opt_begin+1:-1] |
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249 output = output[:opt_begin] |
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250 else: |
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251 options = None |
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252 |
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253 if output not in (C.LOG_OPT_OUTPUT_DEFAULT, C.LOG_OPT_OUTPUT_FILE, C.LOG_OPT_OUTPUT_MEMORY): |
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254 raise ValueError(u"Invalid output [%s]" % output) |
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255 |
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256 if output == C.LOG_OPT_OUTPUT_DEFAULT: |
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257 # no option for defaut handler |
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258 handlers[output] = None |
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259 elif output == C.LOG_OPT_OUTPUT_FILE: |
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260 if not options: |
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261 ValueError("{handler} output need a path as option" .format(handle=output)) |
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262 handlers.setdefault(output, []).append(options) |
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263 options = None # option are parsed, we can empty them |
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264 elif output == C.LOG_OPT_OUTPUT_MEMORY: |
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265 # we have memory handler, option can be the len limit or None |
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266 try: |
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267 limit = int(options) |
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268 options = None # option are parsed, we can empty them |
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269 except (TypeError, ValueError): |
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270 limit = C.LOG_OPT_OUTPUT_MEMORY_LIMIT |
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271 handlers[output] = limit |
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272 |
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273 if options: # we should not have unparsed options |
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274 raise ValueError(u"options [{options}] are not supported for {handler} output".format(options=options, handler=output)) |
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275 |
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276 @staticmethod |
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277 def memoryGet(size=None): |
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278 """Return buffered logs |
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279 |
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280 @param size: number of logs to return |
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281 """ |
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282 raise NotImplementedError |
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283 |
|
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284 @classmethod |
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285 def ansiColors(cls, level, message): |
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286 """Colorise message depending on level for terminals |
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287 |
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288 @param level: one of C.LOG_LEVELS |
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289 @param message: formatted message to log |
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290 @return: message with ANSI escape codes for coloration |
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291 """ |
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292 if level == C.LOG_LVL_DEBUG: |
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293 start = (C.ANSI_FG_CYAN,) |
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294 elif level == C.LOG_LVL_INFO: |
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295 start = () |
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296 elif level == C.LOG_LVL_WARNING: |
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297 start = (C.ANSI_FG_YELLOW,) |
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298 elif level == C.LOG_LVL_ERROR: |
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299 start = (C.ANSI_FG_RED, |
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300 C.ANSI_BLINK, |
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301 r'/!\ ', |
|
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302 C.ANSI_BLINK_OFF) |
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303 elif level == C.LOG_LVL_CRITICAL: |
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304 start = (C.ANSI_BOLD, |
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305 C.ANSI_FG_RED, |
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306 'Guru Meditation ', |
|
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307 C.ANSI_NORMAL_WEIGHT) |
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308 else: |
|
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309 start = () |
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310 if cls._color_location: |
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311 return message % {'color_start': ''.join(start), |
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312 'color_end': C.ANSI_RESET} |
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313 else: |
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314 return '%s%s%s' % (''.join(start), message, C.ANSI_RESET) |
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315 |
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316 @staticmethod |
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317 def getProfile(): |
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318 """Try to find profile value using introspection""" |
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319 raise NotImplementedError |
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320 |
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321 |
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322 class ConfigureCustom(ConfigureBase): |
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323 LOGGER_CLASS = None |
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324 |
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325 def __init__(self, logger_class, *args, **kwargs): |
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326 ConfigureCustom.LOGGER_CLASS = logger_class |
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327 |
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328 |
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329 configure_cls = { None: ConfigureBase, |
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330 C.LOG_BACKEND_CUSTOM: ConfigureCustom |
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331 } # XXX: (key: backend, value: Configure subclass) must be filled when new backend are added |
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332 |
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333 |
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334 def configure(backend_, **options): |
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335 """Configure logging behaviour |
| 991 | 336 @param backend: can be: |
| 337 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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338 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 339 """ |
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340 global backend |
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341 if backend is not None: |
| 991 | 342 raise exceptions.InternalError("Logging can only be configured once") |
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343 backend = backend_ |
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1005
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core (logs): added formatting, name filter and outputs management:
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344 |
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core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
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345 try: |
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346 configure_class = configure_cls[backend] |
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347 except KeyError: |
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3fdacba9da68
core (logs): log color location can now be specified with %(color_start)s and %(color_end)s
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348 raise ValueError("unknown backend [{}]".format(backend)) |
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core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
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349 if backend == C.LOG_BACKEND_CUSTOM: |
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350 logger_class = options.pop('logger_class') |
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351 configure_class(logger_class, **options) |
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352 else: |
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353 configure_class(**options) |
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core (log): configuration and environment variables are now checked for log level and colors:
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354 |
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core (log): moved configuration to core.log_config; this avoid import issues with pyjamas.
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355 def memoryGet(size=None): |
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356 if not C.LOG_OPT_OUTPUT_MEMORY in handlers: |
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357 raise ValueError('memory output is not used') |
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358 return configure_cls[backend].memoryGet(size) |
| 991 | 359 |
| 360 def getLogger(name=C.LOG_BASE_LOGGER): | |
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parents:
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361 try: |
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Goffi <goffi@goffi.org>
parents:
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362 logger_class = configure_cls[backend].LOGGER_CLASS |
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Goffi <goffi@goffi.org>
parents:
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363 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
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364 raise ValueError("This method should not be called with backend [{}]".format(backend)) |
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a7d33c7a8277
core (log): refactoring + twisted backend:
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parents:
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365 return _loggers.setdefault(name, logger_class(name)) |
| 991 | 366 |
| 367 _root_logger = getLogger() | |
| 368 | |
| 369 def debug(msg): | |
| 370 _root_logger.debug(msg) | |
| 371 | |
| 372 def info(msg): | |
| 373 _root_logger.info(msg) | |
| 374 | |
| 375 def warning(msg): | |
| 376 _root_logger.warning(msg) | |
| 377 | |
| 378 def error(msg): | |
| 379 _root_logger.error(msg) | |
| 380 | |
| 381 def critical(msg): | |
| 382 _root_logger.critical(msg) |