蟒蛇看门狗在文件更改

Question

每当我尝试这个代码和文件更新，我得到的命令行上输入以下信息：

SystemError: you can call uwsgi api function only from the main callable

任何人都可以向我解释如何做到这一点吗？

谢谢！

#!/usr/bin/env python 
import logging 
import time 
from flask import Flask, render_template 
from flask.ext.uwsgi_websocket import WebSocket 
from watchdog.events import FileSystemEventHandler 
from watchdog.observers import Observer 

logging.basicConfig(level=logging.ERROR) 

app = Flask(__name__) 
ws = WebSocket(app) 

class MyEventHandler(FileSystemEventHandler): 
    def __init__(self, observer, filename, ws): 
     self.observer = observer 
     self.filename = filename 
     self.ws = ws 

    def on_modified(self, event): 
     self.ws.send('The file is updated!') 

@ws.route('/') 
def websocket_server(ws): 
    path = '/var/lib/omniwallet/addr/' 
    observer = Observer() 

    while True: 
     address = ws.receive() 
     if address is not None: 
      filename = address + '.json' 

      event_handler = MyEventHandler(observer, filename, ws) 
      observer.schedule(event_handler, path, recursive=False) 
      observer.start() 

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

     else: return 

if __name__ == '__main__': 
    app.run(debug=True, threads=16) 

Answer 1

您不能使用这种方法，因为观察者在另一个线程中运行，与管理请求的线程完全无关。您可以使用线程队列更改逻辑：MyEventHandler写入队列，而主要调用等待它并发回websocket消息。