创建文件夹时使用 Python 看门狗库查看多个事件

Question

我遇到了一些问题，我看到了我不希望发生的其他事件。

我正在观看文件夹 C:\Users\kvasko\Downloads\data。如果我复制一个文件夹 2017\LogFile.xml，我将看到以下 3 个 "created" 事件，而我预计只会看到 1 个。如果我提前创建日期文件夹结构（但应用程序运行观看文件夹）它只会像我预期的那样生成一个事件。我从来没有得到一个文件夹创建的事件。这就像为创建文件夹而生成的事件，但是当检查我 on_created(self,event) 上消息的实际事件时，所有三个外观事件看起来完全相同。这是怎么回事？

这是示例输出和最小示例。

2017-09-22 13:58:10,182 - root - INFO - Watchdog: file created C:\Users\kvasko\Downloads\data17\LogFile.xml
2017-09-22 13:58:11,184 - root - INFO - Watchdog: file created C:\Users\kvasko\Downloads\data17\LogFile.xml
2017-09-22 13:58:12,187 - root - INFO - Watchdog: file created C:\Users\kvasko\Downloads\data17\LogFile.xml

我预计：

2017-09-22 13:58:12,187 - root - INFO - Watchdog: file created C:\Users\kvasko\Downloads\data17\LogFile.xml

有没有办法检测它是否实际上来自文件夹创建的多个事件？

以下是我的观察者配置。

folder = "C:\Users\kvasko\Downloads\data"
observer = Observer(MyProcessHandler(patterns=["*.xml"]), folder, recursive=True)
observer.start_observer()

os.mkdirs("C:\Users\kvasko\Downloads\data\2017\07\25")
shutil.copy2("C:\temp\LogFile.xml", "C:\Users\kvasko\Downloads\data\2017\07\25")

try:
    while True:
        time.sleep(5)
except:
    print("Error")

以下是我的handlerclass.

import logging
from watchdog.events import PatternMatchingEventHandler

class MyProcessHandler(PatternMatchingEventHandler):

def on_created(self, event):
    logging.info("Watchdog: file created " + str(event.src_path))

编辑：

这是一个最小的工作示例：

import time
import os
import shutil
import datetime
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler

class   TestEventHandler(PatternMatchingEventHandler):
    def on_created(self, event):
        print (str(datetime.datetime.now()) + " " + str(event))

if __name__ == '__main__':
    path = "C:\Temp"
    event_handler = TestEventHandler(patterns=["*.xml"])
    observer = Observer()
    observer.schedule(event_handler, path, recursive=True)
    observer.start()

    os.makedirs("C:\Temp\2017\07\25")
    shutil.copy2("C:\Temp2\2017\07\25\test.xml", "C:\Temp\2017\07\25")

    try:
       while True:
           time.sleep(1)
    except KeyboardInterrupt:
       observer.stop()
    observer.join()

打印出来：

2017-09-22 15:49:51.334262 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>
2017-09-22 15:49:52.335468 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>
2017-09-22 15:49:53.340998 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>

编辑2：

将 on_created() 更改为 on_any_event()。这就是生产出来的。

2017-09-23 13:14:57.288792 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>
2017-09-23 13:14:58.291327 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>
2017-09-23 13:14:59.293334 <FileCreatedEvent: src_path='C:\Temp\2017\07\25\test.xml'>
2017-09-23 13:14:59.293334 <FileModifiedEvent: src_path='C:\Temp\2017\07\25\test.xml'>

Answer 1

您可能正在经历 this bug。作为解决方法，您可以使用 TestEventHandler class 来记录最后创建的文件路径并且不响应后续的 on_created 事件除非该路径与上次创建的路径不同或者该路径已被删除：

import time
import os
import shutil
import datetime
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler

class TestEventHandler(PatternMatchingEventHandler):
    def __init__(self, *args, **kwargs):
        super(TestEventHandler, self).__init__(*args, **kwargs)
        self.last_created = None
    def on_created(self, event):
        path = event.src_path        
        if path != self.last_created:
            print(str(datetime.datetime.now()) + " " + str(event))
            self.last_created = path
    def on_deleted(self, event):
        path = event.src_path
        if path == self.last_created:
            self.last_created = None

if __name__ == '__main__':

    path = "C:\Temp"
    target_dir = "C:\Temp\2017\07\25"
    src_dir = "C:\Temp2\2017\07\25"
    filename = 'test.xml'

    target = os.path.join(target_dir, filename)
    src = os.path.join(src_dir, filename)

    event_handler = TestEventHandler(patterns=["*.xml"])
    observer = Observer()
    observer.schedule(event_handler, path, recursive=True)
    observer.start()

    if not os.path.exists(target_dir):
        os.makedirs(target_dir)

    if os.path.exists(target):
        os.unlink(target)

    for i in range(3):
        shutil.copy2(src, target_dir)    

    try:
       while True:
           time.sleep(1)
    except KeyboardInterrupt:
       observer.stop()
    observer.join()

创建文件夹时使用 Python 看门狗库查看多个事件

Seeing multiple events with Python watchdog library when folders are created

python

watchdog