python看门狗监控文件的变化
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python watchdog monitoring file for changes
提问by Cmag
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:
伙计们，我需要查看日志文件的更改。在查看了 stackoverflow 问题后，我看到人们推荐“看门狗”。所以我正在尝试测试，但不确定在何处添加文件更改时的代码：
#!/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?
如果文件已添加/更改，我在哪里添加“得到它”，在 while 循环中？
采纳答案by alecxe
Instead of LoggingEventHandlerdefine your handler:
而不是LoggingEventHandler定义您的处理程序：
#!/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_modifiedis called when a file or directory is modified.
on_modified在修改文件或目录时调用。
回答by run_the_race
Here's a snippet to prevent it running twice as others have commented in @alecxe answer:
这是一个片段，以防止它像其他人在@alecxe 回答中评论的那样运行两次：
from datetime import datetime, timedelta
class MyHandler(FileSystemEventHandler):
def __init__(self):
self.last_modified = datetime.now()
def on_modified(self, event):
if datetime.now() - self.last_modified < timedelta(seconds=1):
return
else:
self.last_modified = datetime.now()
print(f'Event type: {event.event_type} path : {event.src_path}')
print(event.is_directory) # This attribute is also available
