I'm quite new to Python and hope the answer to this is obvious to most of you.
I'm creating a class in Python that represents a ScanFolder.
In the __init__ of that class, I start a watchdog.observers
This observer will fire a watchdog.events.PatternMatchingEventHandler whenever a file is changed under the watched directory.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
import time
from watchdog.observers import Observer
import watchdog.events
path = sys.argv[1] if len(sys.argv) > 1 else '.'
class MyEventHandler(watchdog.events.PatternMatchingEventHandler):
def on_any_event(self, event):
print(event.src_path, event.event_type)
class ScanFolder:
'Class defining a scan folder'
def __init__(self, path):
self.path = path
self.documents = dict() # key = document label value = Document reference
self.event_handler = MyEventHandler(patterns=["*.jpg", "*.jpeg", "*.png", "*.bmp", "*.pdf"],
ignore_patterns=[],
ignore_directories=True)
self.observer = Observer()
self.observer.schedule(self.event_handler, self.path, recursive=False)
self.observer.start()
def stop(self):
self.observer.stop()
self.observer.join()
scan_folder = ScanFolder(path)
try:
while True:
time.sleep(1)
"""Here, I'll act on my scan_folder object that lists the discovered files"""
except KeyboardInterrupt:
log.warning("Ouch !!! Keyboard interrupt received.")
scan_folder.stop()
My problem is the following:
How can I have my scan_folder object modified by my scan_folder.event_handler() ?
Actually, I would like to populate the scan_folder.documents dictionary wherever a file is detected in the scan folder.
Thank you very much and sorry for my ignorance.
There are a lot of way to do it: but the simplest way is set a bound method of ScanFolder as on_any_event callback function of watchdog.events.PatternMatchingEventHandler. So your code become:
class ScanFolder:
'Class defining a scan folder'
def __init__(self, path):
self.path = path
self.documents = dict() # key = document label value = Document reference
self.event_handler = watchdog.events.PatternMatchingEventHandler(
patterns=["*.jpg", "*.jpeg", "*.png", "*.bmp", "*.pdf"],
ignore_patterns=[],
ignore_directories=True)
self.event_handler.on_any_event = self.on_any_event
self.observer = Observer()
self.observer.schedule(self.event_handler, self.path, recursive=False)
self.observer.start()
def on_any_event(self, event):
print(event.src_path, event.event_type)
print("Complete ScanFolder() access")
def stop(self):
self.observer.stop()
self.observer.join()
Other way could be derive ScanFolder from watchdog.events.PatternMatchingEventHandler .... But injecting function is one of the power of python