[英]Watchdog: OSError: [Errno 9] Bad file descriptor with watchdog
[英]Handling OSError from Watchdog
我一直在使用 tkinter 組合看門狗模塊來處理一些上傳請求。 大多數情況下它工作正常,但有時我們的網絡驅動器會變得不穩定並在一定時間內斷開連接。 但是,我無法找到捕獲此錯誤的正確位置。
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
import tkinter as tk
root = tk.Tk()
path = [r"Network path 1",r"Network path 2"]
class MyGui:
def __init__(self,master):
self.master = master
self.but = tk.Button(master,text="Click to start observer",command=self.start_observer)
self.but.pack()
def start_observer(self):
for i in path:
observer.schedule(event_handler, path=i, recursive=False)
observer.start()
self.but.config(state="disabled",text="observer started")
print ("Observer started")
class MyHandler(FileSystemEventHandler):
def on_created(self, event):
current_file = event.src_path
print (current_file)
event_handler = MyHandler()
observer = Observer()
gui = MyGui(root)
root.mainloop()
這是我讓它運行幾天后得到的:
Exception in thread Thread-4:
Traceback (most recent call last):
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\api.py", line 146, in run
self.queue_events(self.timeout)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\read_directory_changes.py", line 75, in queue_events
winapi_events = read_events(self._handle, self.watch.is_recursive)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 346, in read_events
buf, nbytes = read_directory_changes(handle, recursive)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 306, in read_directory_changes
raise e
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 302, in read_directory_changes
ctypes.byref(nbytes), None, None)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 107, in _errcheck_bool
raise ctypes.WinError()
OSError: [WinError 64] The specified network name is no longer available.
誰能建議如何正確處理這個異常?
我是這樣解決這個問題的:
from watchdog import observers
from watchdog.observers.api import DEFAULT_OBSERVER_TIMEOUT, BaseObserver
class MyEmitter(observers.read_directory_changes.WindowsApiEmitter):
def queue_events(self, timeout):
try:
super().queue_events(timeout)
except OSError as e:
print(e)
connected = False
while not connected:
try:
self.on_thread_start() # need to re-set the directory handle.
connected = True
print('reconnected')
except OSError:
print('attempting to reconnect...')
time.sleep(10)
observer = BaseObserver(emitter_class=MyEmitter, timeout=DEFAULT_OBSERVER_TIMEOUT)
...
子類化WindowsApiEmitter
以捕獲queue_events
的異常。 為了在重新連接后繼續,看門狗需要重新設置目錄句柄,我們可以使用self.on_thread_start()
。
然后使用MyEmitter
和BaseObserver
,我們現在可以處理與共享驅動器的丟失和重新連接。
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