python - pyinotify 方法未调用

Question

我想创建一个监视文件夹的模块。我写了一些代码:

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()    

当我修改文件然后将其删除时，从未调用过 process_IN_MODIFY 和 process_IN_DELETE 方法。我怎么解决它？

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

操作系统是 Linux mint 13。

UPD:新代码

Answer 1

试试下面的代码。它与您的代码基本相同；我只添加了

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

最后启动一个FileWatcher。确保目录 /tmp/test 存在，或者更改该行以指向一个存在的目录。

如果 /tmp/test 中存在文件 foo，如果我修改了这个文件，上面的程序打印

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

现在如果我删除文件，程序会打印:

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)

---

顺便说一下，一旦你调用了f.start_watch，这个过程就陷入了一个while True循环，它无法从中逃脱。即使从另一个线程调用 f.stop_watch 也不会以某种方式使您脱离此 while 循环。

如果您确实计划使用线程，您可能需要将一个 threading.Event 传递给 start_watch，并在 while-loop< 中检查它的状态 决定何时跳出循环。