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annotate planemo/lib/python3.7/site-packages/galaxy/util/watcher.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # TODO: this is largely copied from galaxy.tools.toolbox.galaxy and generalized, the tool-oriented watchers in that
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2 # module should probably be updated to use this where possible
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3
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4 from __future__ import absolute_import
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5
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6 import logging
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7 import os.path
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8 import time
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9
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10 from six.moves import filter
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11
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12 try:
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13 from watchdog.events import FileSystemEventHandler
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14 from watchdog.observers import Observer
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15 from watchdog.observers.polling import PollingObserver
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16 can_watch = True
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17 except ImportError:
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18 Observer = None
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19 FileSystemEventHandler = object
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20 PollingObserver = None
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21 can_watch = False
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22
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23 from galaxy.util.hash_util import md5_hash_file
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24
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25 log = logging.getLogger(__name__)
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26
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27
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28 def get_observer_class(config_name, config_value, default, monitor_what_str):
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29 """
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30 """
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31 config_value = config_value or default
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32 config_value = str(config_value).lower()
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33 if config_value in ("true", "yes", "on", "auto"):
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34 expect_observer = True
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35 observer_class = Observer
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36 elif config_value == "polling":
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37 expect_observer = True
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38 observer_class = PollingObserver
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39 elif config_value in ('false', 'no', 'off'):
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40 expect_observer = False
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41 observer_class = None
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42 else:
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43 message = "Unrecognized value for %s config option: %s" % (config_name, config_value)
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44 raise Exception(message)
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45
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46 if expect_observer and observer_class is None:
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47 message = "Watchdog library unavailable, cannot monitor %s." % monitor_what_str
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48 if config_value == "auto":
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49 log.info(message)
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50 else:
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51 raise Exception(message)
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52
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53 return observer_class
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54
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55
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56 def get_watcher(config, config_name, default="False", monitor_what_str=None, watcher_class=None,
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57 event_handler_class=None, **kwargs):
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58 config_value = getattr(config, config_name, None)
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59 observer_class = get_observer_class(config_name, config_value, default=default, monitor_what_str=monitor_what_str)
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60 if observer_class is not None:
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61 watcher_class = watcher_class or Watcher
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62 event_handler_class = event_handler_class or EventHandler
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63 return watcher_class(observer_class, event_handler_class, **kwargs)
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64 else:
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65 return NullWatcher()
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66
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67
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68 class BaseWatcher(object):
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69
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70 def __init__(self, observer_class, even_handler_class, **kwargs):
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71 self.observer = None
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72 self.observer_class = observer_class
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73 self.event_handler = even_handler_class(self)
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74 self.monitored_dirs = {}
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75
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76 def start(self):
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77 if self.observer is None:
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78 self.observer = self.observer_class()
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79 self.observer.start()
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80 self.resume_watching()
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81
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82 def monitor(self, dir_path, recursive=False):
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83 self.monitored_dirs[dir_path] = recursive
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84 if self.observer is not None:
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85 self.observer.schedule(self.event_handler, dir_path, recursive=recursive)
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86
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87 def resume_watching(self):
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88 for dir_path, recursive in self.monitored_dirs.items():
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89 self.monitor(dir_path, recursive)
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90
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91 def shutdown(self):
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92 if self.observer is not None:
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93 self.observer.stop()
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94 self.observer.join()
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95 self.observer = None
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96
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97
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98 class Watcher(BaseWatcher):
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99
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100 def __init__(self, observer_class, event_handler_class, **kwargs):
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101 super(Watcher, self).__init__(observer_class, event_handler_class, **kwargs)
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102 self.path_hash = {}
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103 self.file_callbacks = {}
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104 self.dir_callbacks = {}
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105 self.ignore_extensions = {}
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106 self.require_extensions = {}
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107 self.event_handler = event_handler_class(self)
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108
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109 def watch_file(self, file_path, callback=None):
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110 file_path = os.path.abspath(file_path)
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111 dir_path = os.path.dirname(file_path)
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112 if dir_path not in self.monitored_dirs:
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113 if callback is not None:
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114 self.file_callbacks[file_path] = callback
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115 self.monitor(dir_path)
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116 log.debug("Watching for changes to file: %s", file_path)
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117
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118 def watch_directory(self, dir_path, callback=None, recursive=False, ignore_extensions=None, require_extensions=None):
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119 dir_path = os.path.abspath(dir_path)
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120 if dir_path not in self.monitored_dirs:
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121 if callback is not None:
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122 self.dir_callbacks[dir_path] = callback
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123 if ignore_extensions:
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124 self.ignore_extensions[dir_path] = ignore_extensions
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125 if require_extensions:
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126 self.require_extensions[dir_path] = require_extensions
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127 self.monitor(dir_path, recursive=recursive)
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128 log.debug("Watching for changes in directory%s: %s", ' (recursively)' if recursive else '', dir_path)
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129
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130
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131 class EventHandler(FileSystemEventHandler):
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132
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133 def __init__(self, watcher):
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134 self.watcher = watcher
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135
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136 def on_any_event(self, event):
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137 self._handle(event)
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138
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139 def _extension_check(self, key, path):
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140 required_extensions = self.watcher.require_extensions.get(key)
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141 if required_extensions:
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142 return any(filter(path.endswith, required_extensions))
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143 return not any(filter(path.endswith, self.watcher.ignore_extensions.get(key, [])))
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144
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145 def _handle(self, event):
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146 # modified events will only have src path, move events will
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147 # have dest_path and src_path but we only care about dest. So
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148 # look at dest if it exists else use src.
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149 path = getattr(event, 'dest_path', None) or event.src_path
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150 path = os.path.abspath(path)
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151 callback = self.watcher.file_callbacks.get(path)
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152 if os.path.basename(path).startswith('.'):
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153 return
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154 if callback:
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155 ext_ok = self._extension_check(path, path)
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156 else:
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157 # reversed sort for getting the most specific dir first
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158 for key in reversed(sorted(self.watcher.dir_callbacks.keys())):
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159 if os.path.commonprefix([path, key]) == key:
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160 callback = self.watcher.dir_callbacks[key]
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161 ext_ok = self._extension_check(key, path)
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162 break
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163 if not callback or not ext_ok:
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164 return
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165 cur_hash = md5_hash_file(path)
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166 if cur_hash:
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167 if self.watcher.path_hash.get(path) == cur_hash:
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168 return
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169 else:
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170 time.sleep(0.5)
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171 if cur_hash != md5_hash_file(path):
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172 # We're still modifying the file, it'll be picked up later
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173 return
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174 self.watcher.path_hash[path] = cur_hash
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175 callback(path=path)
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176
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177
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178 class NullWatcher(object):
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179
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180 def start(self):
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181 pass
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182
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183 def shutdown(self):
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184 pass
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185
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186 def watch_file(self, *args, **kwargs):
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187 pass
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188
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189 def watch_directory(self, *args, **kwargs):
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190 pass