python - 与其他代码并行执行 python Web 服务器

Question

我想在线程中或作为并行进程运行本地化的 Web 服务器，然后能够在同一个 Python 程序中从该 Web 服务器查询 URL。我正在构建 html self 激励幻灯片，然后将使用 qt 在网络浏览器中显示它们。

Web 服务器只会在本地以非常低的数量进行查询。

我尝试使用线程来完成此操作，现在这个程序使用多处理。我从两者那里得到了类似的堆栈跟踪。

我的问题:我怎样才能让网络服务器运行而不阻止网络服务器启动后执行的代码？

import http.server
import socketserver
import os
from multiprocessing import Process
import time

def run_webserver():
    cwd = os.getcwd()
    os.chdir("./www/public")
    PORT = 8002
    Handler = http.server.SimpleHTTPRequestHandler

    with socketserver.TCPServer(("", PORT), Handler) as httpd:
        print("serving at port", PORT)

    return httpd

if __name__ == '__main__':
    httpd = run_webserver()
    p = Process(target=httpd.serve_forever, args=())
    p.start()
    p.join()

    # do other work
    for i in range(200):
        print(str(i))
        time.sleep(500)

serving at port 8002
Process Process-1:
Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/multiprocessing/    process.py", line 249, in _bootstrap
    self.run()
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/multiprocessing/    process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line     233, in serve_forever
    selector.register(self, selectors.EVENT_READ)
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/selectors.py", line 351,     in register
    key = super().register(fileobj, events, data)
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/selectors.py", line 237,     in register
    key = SelectorKey(fileobj, self._fileobj_lookup(fileobj), events, data)
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/selectors.py", line 224,     in _fileobj_lookup
    return _fileobj_to_fd(fileobj)
  File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/selectors.py", line 41,     in _fileobj_to_fd
    raise ValueError("Invalid file descriptor: {}".format(fd))
ValueError: Invalid file descriptor: -1

Answer 1

好的，它开始工作了。

import http.server
import socketserver
import os
import multiprocessing
import time

def run_webserver():
    os.chdir("./www/public")
    PORT = 8002
    Handler = http.server.SimpleHTTPRequestHandler
    httpd = socketserver.TCPServer(('0.0.0.0', PORT), Handler)

    #the following throws an exception
    #with socketserver.TCPServer(("0.0.0.0", PORT), Handler) as httpd:
    #    print("serving at port", PORT)

    httpd.serve_forever(poll_interval=0.5)

    return

if __name__ == '__main__':
    p = multiprocessing.Process(target=run_webserver, args=())
    p.daemon = True
    p.start()

    # do other work
    for i in range(200):
        print(str(i))
        time.sleep(1)