Mercurial > libervia-backend
annotate src/core/log_config.py @ 2035:5c6db4329288
core (constants): added XMLUI_DATA_LVLS constants which group all available levels
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 21 Aug 2016 12:03:34 +0200 |
| parents | 7f053e1f0b67 |
| children | 0931b5a6213c |
| 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. |
| 991 | 22 |
| 23 from sat.core.constants import Const as C | |
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24 from sat.core import log |
| 991 | 25 |
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26 |
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27 class TwistedLogger(log.Logger): |
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28 colors = True |
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29 force_colors = False |
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30 |
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31 def __init__(self, *args, **kwargs): |
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32 super(TwistedLogger, self).__init__(*args, **kwargs) |
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33 from twisted.python import log as twisted_log |
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34 self.twisted_log = twisted_log |
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35 |
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36 def out(self, message, level=None): |
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37 """Actually log the message |
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38 |
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39 @param message: formatted message |
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40 """ |
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41 self.twisted_log.msg(message.encode('utf-8', 'ignore'), sat_logged=True, level=level) |
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42 |
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43 |
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44 class ConfigureBasic(log.ConfigureBase): |
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45 |
| 1942 | 46 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 47 super(ConfigureBasic, self).configureColors(colors, force_colors, levels_taints_dict) | |
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48 if colors: |
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49 import sys |
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50 if force_colors or sys.stdout.isatty(): # FIXME: isatty should be tested on each handler, not globaly |
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51 # we need colors |
| 1942 | 52 log.Logger.post_treat = lambda logger, level, message: self.ansiColors(level, message) |
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53 elif force_colors: |
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54 raise ValueError("force_colors can't be used if colors is False") |
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55 |
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56 @staticmethod |
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57 def getProfile(): |
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58 """Try to find profile value using introspection""" |
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59 import inspect |
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60 stack = inspect.stack() |
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61 current_path = stack[0][1] |
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62 for frame_data in stack[:-1]: |
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63 if frame_data[1] != current_path: |
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64 if log.backend == C.LOG_BACKEND_STANDARD and "/logging/__init__.py" in frame_data[1]: |
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65 continue |
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66 break |
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67 |
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68 frame = frame_data[0] |
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69 args = inspect.getargvalues(frame) |
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70 try: |
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71 profile = args.locals.get('profile') or args.locals['profile_key'] |
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72 except (TypeError, KeyError): |
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73 try: |
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74 try: |
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75 profile = args.locals['self'].profile |
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76 except AttributeError: |
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77 try: |
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78 profile = args.locals['self'].parent.profile |
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79 except AttributeError: |
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80 profile = args.locals['self'].host.profile # used in quick_frontend for single profile configuration |
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81 except Exception: |
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82 # we can't find profile, we return an empty value |
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83 profile = '' |
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84 return profile |
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85 |
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86 |
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87 class ConfigureTwisted(ConfigureBasic): |
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88 LOGGER_CLASS = TwistedLogger |
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89 |
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90 def changeObserver(self, observer, can_colors=False): |
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91 """Install a hook on observer to manage SàT specificities |
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92 |
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93 @param observer: original observer to hook |
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94 @param can_colors: True if observer can display ansi colors |
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95 """ |
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96 def observer_hook(event): |
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97 """redirect non SàT log to twisted_logger, and add colors when possible""" |
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98 if 'sat_logged' in event: # we only want our own logs, other are managed by twistedObserver |
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99 # we add colors if possible |
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100 if (can_colors and self.LOGGER_CLASS.colors) or self.LOGGER_CLASS.force_colors: |
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101 message = event.get('message', tuple()) |
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102 level = event.get('level', C.LOG_LVL_INFO) |
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103 if message: |
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104 event['message'] = (self.ansiColors(level, ''.join(message)),) # must be a tuple |
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105 observer(event) # we can now call the original observer |
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106 |
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107 return observer_hook |
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108 |
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109 def changeFileLogObserver(self, observer): |
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110 """Install SàT hook for FileLogObserver |
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111 |
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112 if the output is a tty, we allow colors, else we don't |
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113 @param observer: original observer to hook |
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114 """ |
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115 log_obs = observer.__self__ |
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116 log_file = log_obs.write.__self__ |
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117 try: |
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118 can_colors = log_file.isatty() |
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119 except AttributeError: |
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120 can_colors = False |
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121 return self.changeObserver(observer, can_colors=can_colors) |
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122 |
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123 def installObserverHook(self, observer): |
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124 """Check observer type and install SàT hook when possible |
| 991 | 125 |
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126 @param observer: observer to hook |
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127 @return: hooked observer or original one |
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128 """ |
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129 if hasattr(observer, '__self__'): |
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130 ori = observer |
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131 if isinstance(observer.__self__, self.twisted_log.FileLogObserver): |
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132 observer = self.changeFileLogObserver(observer) |
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133 elif isinstance(observer.__self__, self.twisted_log.DefaultObserver): |
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134 observer = self.changeObserver(observer, can_colors=True) |
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135 else: |
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136 # we use print because log system is not fully initialized |
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137 print("Unmanaged observer [%s]" % observer) |
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138 return observer |
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139 self.observers[ori] = observer |
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140 return observer |
| 991 | 141 |
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142 def preTreatment(self): |
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143 """initialise needed attributes, and install observers hooks""" |
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144 self.observers = {} |
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145 from twisted.python import log as twisted_log |
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146 self.twisted_log = twisted_log |
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147 self.log_publisher = twisted_log.msg.__self__ |
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148 def addObserverObserver(self_logpub, other): |
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149 """Install hook so we know when a new observer is added""" |
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150 other = self.installObserverHook(other) |
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151 return self_logpub._originalAddObserver(other) |
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152 def removeObserverObserver(self_logpub, ori): |
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153 """removeObserver hook fix |
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154 |
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155 As we wrap the original observer, the original removeObserver may want to remove the original object instead of the wrapper, this method fix this |
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156 """ |
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157 if ori in self.observers: |
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158 self_logpub._originalRemoveObserver(self.observers[ori]) |
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159 else: |
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160 try: |
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161 self_logpub._originalRemoveObserver(ori) |
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162 except ValueError: |
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163 try: |
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164 ori in self.cleared_observers |
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165 except AttributeError: |
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166 raise ValueError("Unknown observer") |
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167 |
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168 # we replace addObserver/removeObserver by our own |
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169 twisted_log.LogPublisher._originalAddObserver = twisted_log.LogPublisher.addObserver |
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170 twisted_log.LogPublisher._originalRemoveObserver = twisted_log.LogPublisher.removeObserver |
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171 import types # see https://stackoverflow.com/a/4267590 (thx Chris Morgan/aaronasterling) |
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172 twisted_log.addObserver = types.MethodType(addObserverObserver, self.log_publisher, twisted_log.LogPublisher) |
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173 twisted_log.removeObserver = types.MethodType(removeObserverObserver, self.log_publisher, twisted_log.LogPublisher) |
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174 |
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175 # we now change existing observers |
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176 for idx, observer in enumerate(self.log_publisher.observers): |
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177 self.log_publisher.observers[idx] = self.installObserverHook(observer) |
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178 |
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179 def configureLevel(self, level): |
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180 self.LOGGER_CLASS.level = level |
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181 super(ConfigureTwisted, self).configureLevel(level) |
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182 |
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183 def configureOutput(self, output): |
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184 import sys |
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185 if output is None: |
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186 output = C.LOG_OPT_OUTPUT_SEP + C.LOG_OPT_OUTPUT_DEFAULT |
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187 self.manageOutputs(output) |
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188 addObserver = self.twisted_log.addObserver |
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189 |
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190 if C.LOG_OPT_OUTPUT_DEFAULT in log.handlers: |
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191 # default output is already managed, we just add output to stdout if we are in debug or nodaemon mode |
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192 if self.backend_data is None: |
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193 raise ValueError("You must pass options as backend_data with Twisted backend") |
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194 options = self.backend_data |
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195 if options.get('nodaemon', False) or options.get('debug', False): |
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196 addObserver(self.twisted_log.FileLogObserver(sys.stdout).emit) |
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197 else: |
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198 # \\default is not in the output, so we remove current observers |
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199 self.cleared_observers = self.log_publisher.observers |
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200 self.observers.clear() |
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201 del self.log_publisher.observers[:] |
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202 # and we forbid twistd to add any observer |
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203 self.twisted_log.addObserver = lambda other: None |
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204 |
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205 if C.LOG_OPT_OUTPUT_FILE in log.handlers: |
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206 from twisted.python import logfile |
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207 for path in log.handlers[C.LOG_OPT_OUTPUT_FILE]: |
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208 log_file = sys.stdout if path == '-' else logfile.LogFile.fromFullPath(path) |
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209 addObserver(self.twisted_log.FileLogObserver(log_file).emit) |
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210 |
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211 if C.LOG_OPT_OUTPUT_MEMORY in log.handlers: |
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212 raise NotImplementedError("Memory observer is not implemented in Twisted backend") |
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213 |
| 1942 | 214 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 215 super(ConfigureTwisted, self).configureColors(colors, force_colors, levels_taints_dict) | |
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216 self.LOGGER_CLASS.colors = colors |
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217 self.LOGGER_CLASS.force_colors = force_colors |
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218 if force_colors and not colors: |
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219 raise ValueError('colors must be True if force_colors is True') |
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220 |
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221 def postTreatment(self): |
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222 """Install twistedObserver which manage non SàT logs""" |
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223 def twistedObserver(event): |
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224 """Observer which redirect log message not produced by SàT to SàT logging system""" |
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225 if not 'sat_logged' in event: |
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226 # this log was not produced by SàT |
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227 from twisted.python import log as twisted_log |
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228 text = twisted_log.textFromEventDict(event) |
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229 if text is None: |
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230 return |
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231 twisted_logger = log.getLogger(C.LOG_TWISTED_LOGGER) |
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232 log_method = twisted_logger.error if event.get('isError', False) else twisted_logger.info |
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233 log_method(text.decode('utf-8')) |
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234 |
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235 self.log_publisher._originalAddObserver(twistedObserver) |
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236 |
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237 |
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238 class ConfigureStandard(ConfigureBasic): |
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239 |
| 1942 | 240 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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241 if fmt is None: |
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242 fmt = C.LOG_OPT_FORMAT[1] |
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243 if output is None: |
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244 output = C.LOG_OPT_OUTPUT[1] |
| 1942 | 245 super(ConfigureStandard, self).__init__(level, fmt, output, logger, colors, levels_taints_dict, force_colors, backend_data) |
| 991 | 246 |
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247 def preTreatment(self): |
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248 """We use logging methods directly, instead of using Logger""" |
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249 import logging |
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250 log.getLogger = logging.getLogger |
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251 log.debug = logging.debug |
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252 log.info = logging.info |
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253 log.warning = logging.warning |
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254 log.error = logging.error |
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255 log.critical = logging.critical |
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256 |
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257 def configureLevel(self, level): |
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258 if level is None: |
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259 level = C.LOG_LVL_DEBUG |
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260 self.level = level |
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261 |
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262 def configureFormat(self, fmt): |
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263 super(ConfigureStandard, self).configureFormat(fmt) |
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264 import logging |
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265 |
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266 class SatFormatter(logging.Formatter): |
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267 u"""Formatter which manage SàT specificities""" |
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268 _format = fmt |
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269 _with_profile = '%(profile)s' in fmt |
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270 |
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271 def __init__(self, can_colors=False): |
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272 super(SatFormatter, self).__init__(self._format) |
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273 self.can_colors = can_colors |
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274 |
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275 def format(self, record): |
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276 if self._with_profile: |
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277 record.profile = ConfigureStandard.getProfile() |
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278 do_color = self.with_colors and (self.can_colors or self.force_colors) |
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279 if ConfigureStandard._color_location: |
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280 # we copy raw formatting strings for color_* |
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281 # as formatting is handled in ansiColors in this case |
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282 if do_color: |
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283 record.color_start = log.COLOR_START |
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284 record.color_end = log.COLOR_END |
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285 else: |
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286 record.color_start = record.color_end = '' |
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287 s = super(SatFormatter, self).format(record) |
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288 if do_color: |
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289 s = ConfigureStandard.ansiColors(record.levelname, s) |
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290 return s |
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291 |
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292 self.formatterClass = SatFormatter |
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293 |
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294 def configureOutput(self, output): |
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295 self.manageOutputs(output) |
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296 |
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297 def configureLogger(self, logger): |
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298 self.name_filter = log.FilterName(logger) if logger else None |
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299 |
| 1942 | 300 def configureColors(self, colors, force_colors, levels_taints_dict): |
| 301 super(ConfigureStandard, self).configureColors(colors, force_colors, levels_taints_dict) | |
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302 self.formatterClass.with_colors = colors |
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303 self.formatterClass.force_colors = force_colors |
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304 if not colors and force_colors: |
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305 raise ValueError("force_colors can't be used if colors is False") |
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306 |
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307 def _addHandler(self, root_logger, hdlr, can_colors=False): |
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308 hdlr.setFormatter(self.formatterClass(can_colors)) |
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309 root_logger.addHandler(hdlr) |
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310 root_logger.setLevel(self.level) |
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311 if self.name_filter is not None: |
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312 hdlr.addFilter(self.name_filter) |
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313 |
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314 def postTreatment(self): |
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315 import logging |
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316 root_logger = logging.getLogger() |
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317 if len(root_logger.handlers) == 0: |
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318 for handler, options in log.handlers.items(): |
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319 if handler == C.LOG_OPT_OUTPUT_DEFAULT: |
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320 hdlr = logging.StreamHandler() |
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321 try: |
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322 can_colors = hdlr.stream.isatty() |
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323 except AttributeError: |
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324 can_colors = False |
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325 self._addHandler(root_logger, hdlr, can_colors=can_colors) |
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326 elif handler == C.LOG_OPT_OUTPUT_MEMORY: |
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327 from logging.handlers import BufferingHandler |
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328 class SatMemoryHandler(BufferingHandler): |
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329 def emit(self, record): |
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330 super(SatMemoryHandler, self).emit(self.format(record)) |
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331 hdlr = SatMemoryHandler(options) |
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332 log.handlers[handler] = hdlr # we keep a reference to the handler to read the buffer later |
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333 self._addHandler(root_logger, hdlr, can_colors=False) |
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334 elif handler == C.LOG_OPT_OUTPUT_FILE: |
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335 import os.path |
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336 for path in options: |
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337 hdlr = logging.FileHandler(os.path.expanduser(path)) |
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338 self._addHandler(root_logger, hdlr, can_colors=False) |
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339 else: |
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340 raise ValueError("Unknown handler type") |
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341 else: |
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342 root_logger.warning(u"Handlers already set on root logger") |
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343 |
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344 @staticmethod |
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345 def memoryGet(size=None): |
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346 """Return buffered logs |
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347 |
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348 @param size: number of logs to return |
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349 """ |
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350 mem_handler = log.handlers[C.LOG_OPT_OUTPUT_MEMORY] |
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351 return (log_msg for log_msg in mem_handler.buffer[size if size is None else -size:]) |
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352 |
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353 |
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354 log.configure_cls[C.LOG_BACKEND_BASIC] = ConfigureBasic |
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355 log.configure_cls[C.LOG_BACKEND_TWISTED] = ConfigureTwisted |
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356 log.configure_cls[C.LOG_BACKEND_STANDARD] = ConfigureStandard |
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357 |
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358 def configure(backend, **options): |
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359 """Configure logging behaviour |
| 991 | 360 @param backend: can be: |
| 361 C.LOG_BACKEND_STANDARD: use standard logging module | |
| 362 C.LOG_BACKEND_TWISTED: use twisted logging module (with standard logging observer) | |
| 363 C.LOG_BACKEND_BASIC: use a basic print based logging | |
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364 C.LOG_BACKEND_CUSTOM: use a given Logger subclass |
| 991 | 365 """ |
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366 return log.configure(backend, **options) |
| 991 | 367 |
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368 def _parseOptions(options): |
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369 """Parse string options as given in conf or environment variable, and return expected python value |
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370 |
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371 @param options (dict): options with (key: name, value: string value) |
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372 """ |
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373 COLORS = C.LOG_OPT_COLORS[0] |
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374 LEVEL = C.LOG_OPT_LEVEL[0] |
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375 |
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376 if COLORS in options: |
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377 if options[COLORS].lower() in ('1', 'true'): |
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378 options[COLORS] = True |
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379 elif options[COLORS] == 'force': |
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380 options[COLORS] = True |
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381 options['force_colors'] = True |
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382 else: |
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383 options[COLORS] = False |
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384 if LEVEL in options: |
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385 level = options[LEVEL].upper() |
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386 if level not in C.LOG_LEVELS: |
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387 level = C.LOG_LVL_INFO |
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388 options[LEVEL] = level |
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389 |
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390 def satConfigure(backend=C.LOG_BACKEND_STANDARD, const=None, backend_data=None): |
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391 """Configure logging system for SàT, can be used by frontends |
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392 |
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393 logs conf is read in SàT conf, then in environment variables. It must be done before Memory init |
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394 @param backend: backend to use, it can be: |
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395 - C.LOG_BACKEND_BASIC: print based backend |
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396 - C.LOG_BACKEND_TWISTED: Twisted logging backend |
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397 - C.LOG_BACKEND_STANDARD: standard logging backend |
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398 @param const: Const class to use instead of sat.core.constants.Const (mainly used to change default values) |
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399 """ |
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400 if const is not None: |
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401 global C |
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402 C = const |
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403 log.C = const |
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404 from sat.tools import config |
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405 import os |
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406 log_conf = {} |
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407 sat_conf = config.parseMainConf() |
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408 for opt_name, opt_default in C.LOG_OPTIONS(): |
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409 try: |
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410 log_conf[opt_name] = os.environ[''.join((C.ENV_PREFIX, C.LOG_OPT_PREFIX.upper(), opt_name.upper()))] |
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411 except KeyError: |
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412 log_conf[opt_name] = config.getConfig(sat_conf, C.LOG_OPT_SECTION, C.LOG_OPT_PREFIX + opt_name, opt_default) |
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413 |
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414 _parseOptions(log_conf) |
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415 configure(backend, backend_data=backend_data, **log_conf) |