Folks, I have a need to watch a log file for changes. After looking through stackoverflow questions, I see people recommending 'watchdog'. So i'm trying to test, and am not sure where to add the code for when files change:

#!/usr/bin/python

import time

from watchdog.observers import Observer

from watchdog.events import LoggingEventHandler

if __name__ == "__main__":

event_handler = LoggingEventHandler()

observer = Observer()

observer.schedule(event_handler, path='.', recursive=False)

observer.start()

try:

while True:

time.sleep(1)

else:

print "got it"

except KeyboardInterrupt:

observer.stop()

observer.join()

Where do I add the "got it", in the while loop if the files have been added/changed?

解决方案

Instead of LoggingEventHandler define your handler:

#!/usr/bin/python

import time

from watchdog.observers import Observer

from watchdog.events import FileSystemEventHandler

class MyHandler(FileSystemEventHandler):

def on_modified(self, event):

print(f'event type: {event.event_type} path : {event.src_path}')

if __name__ == "__main__":

event_handler = MyHandler()

observer = Observer()

observer.schedule(event_handler, path='/data/', recursive=False)

observer.start()

try:

while True:

time.sleep(1)

except KeyboardInterrupt:

observer.stop()

observer.join()

on_modified is called when a file or directory is modified.