未调用的pyinotify方法

Question

我想要创建一个模块来监视文件夹。我编写了一些代码：

import os, pyinotify

class FileWatcher:
    def start_watch(self, dir):
        wm = pyinotify.WatchManager()
        self.notifier = pyinotify.Notifier(wm, EventProcessor())
        mask = pyinotify.IN_CREATE | pyinotify.IN_MODIFY | pyinotify.IN_DELETE | pyinotify.IN_DELETE_SELF | pyinotify.IN_MOVED_FROM | pyinotify.IN_MOVED_TO
        wdd = wm.add_watch(dir, mask, rec=True)
        while True:
            self.notifier.process_events()
            if self.notifier.check_events():
                self.notifier.read_events()

    def stop_watch(self):
        self.notifier.stop()
        print ('\nWatcher stopped')

class EventProcessor(pyinotify.ProcessEvent):
    def process_IN_CREATE(self, event):
        print('in CREATE')

    def process_IN_MODIFY(self, event):
        print('in MODIFY')

    def process_IN_DELETE(self, event):
        print('in delete')

    def process_IN_DELETE_SELF(self, event):
        print('in delete self')

    def process_IN_MOVED_FROM(self, event):
        print('in MOVED_FROM')

    def process_IN_MOVED_TO(self, event):
        print('in IN_MOVED_TO')

if __name__ == "__main__":
    watcher = FileWatcher()
    try:
        folder = "/home/user/Desktop/PythonFS"
        watcher.start_watch(folder)
    except KeyboardInterrupt:
        watcher.stop_watch()    

当我修改一个文件然后删除它时，process_IN_MODIFY和process_IN_DELETE方法从未被调用过。我是怎么解决的？

但是，当我创建一个文件时，调用了process_IN_CREATE()方法。

操作系统是Linux 13。

UPD:新代码

Answer 1

试试下面的代码。它基本上与您的代码相同，我只添加了

f = FileWatcher()
f.start_watch('/tmp/test', None)

在结束时启动FileWatcher。确保目录/tmp/test存在，否则将该行更改为指向存在的目录。

如果foo文件存在于/tmp/test中，如果我修改该文件，则上面的程序将打印

in create   # after modification
in modify   # after saving
in modify
in delete

现在，如果我删除该文件，程序将打印：

in delete

import os
import pyinotify


class FileWatcher:
    notifier = None

    def start_watch(self, dir, callback):
        wm = pyinotify.WatchManager()
        self.notifier = pyinotify.Notifier(wm, EventProcessor(callback))
        mask = (pyinotify.IN_CREATE | pyinotify.IN_MODIFY | pyinotify.IN_DELETE
                | pyinotify.IN_DELETE_SELF | pyinotify.IN_MOVED_FROM
                | pyinotify.IN_MOVED_TO)
        wdd = wm.add_watch(dir, mask, rec=True)
        while True:
            self.notifier.process_events()
            if self.notifier.check_events():
                self.notifier.read_events()


class EventProcessor(pyinotify.ProcessEvent):
    def __init__(self, callback):
        self.event_callback = callback

    def process_IN_CREATE(self, event):
        # if self.event_callback is not None:
        # self.event_callback.on_file_created(os.path.join(event.path,
        # event.name))
        print('in create')

    def process_IN_MODIFY(self, event):
        # if self.event_callback is not None:
        # self.event_callback.on_file_modifed(os.path.join(event.path,
        # event.name))
        print('in modify')

    def process_IN_DELETE(self, event):
        print('in delete')

    def process_IN_DELETE_SELF(self, event):
        print('in delete self')

    def process_IN_MOVED_FROM(self, event):
        print('in moved_from')

    def process_IN_MOVED_TO(self, event):
        print('in moved to')


f = FileWatcher()
f.start_watch('/tmp/test', None)

顺便说一句，一旦调用了f.start_watch，进程就会落入一个while True循环中，无法逃避。即使是从另一个线程调用f.stop_watch，也不会以某种方式使您脱离will循环。

如果计划使用线程，则可能需要将threading.Event传递给start_watch，并检查其在while-loop中的状态，以确定何时退出循环。