Question

我想用cherrypy做一个python代码。目标是从UI调用脚本，当脚本在控制台上生成日志时，在UI（Iframe / div）上打印它。我使用的是CherryPy-3.2.4和Python 2.7。以下是我写的拒绝工作的示例代码。

TestProcess.py

from multiprocessing import Process, Queue
import subprocess
import os, os.path
from string import Template
import cherrypy
from multiprocessing import Process, Queue
import HTML
import TestScript

class TestProcess(object):
    PID=0
    jquery_url = 'C:\CherryPy\TestScripts\jquery\jquery-1.11.1.js'
    q=Queue()

    @cherrypy.expose
    def index(self):
        html = """\
            <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
            <HTML>
             <HEAD>
              <TITLE> Test Doc </TITLE>
                <script type="text/javascript" src="/static/jq/jquery-1.11.1.js"></script>
             </HEAD>
             <BODY>
                 <BR/>
                     <h3>Test utility</h3>
                      <form id="ping_form" target="console_iframe" method="post" action="/f">
                              <button id="ping" type="submit">Upgrade Installed Releases</button>
                      </form>

                      <BR/>
                      <iframe name="console_iframe" frameborder="1" width="1200"/>
             </BODY>
            </HTML>
            """
    t = Template(html)
    page = t.substitute(jquery_url=self.jquery_url)
    return page

def f1():
    print "*********** TEST **********************"
    q.put([42, None, 'hello'])

@cherrypy.expose
def f(self, **kw):
    q=Queue()
    ts = TestScript.TestScript()
    p = Process(target=ts.testCallFunction, args=(q,))
    p.start()
    #print q.get()    # prints "[42, None, 'hello']"
    p.join()
    print "Test F"

    def run_command():
      # The yeilds here are the key to keeping things streaming
      yield '<style>body {font-family: monospace;}</style>'
      while(p.is_alive()):
        while(not q.empty()):
          yield q.get_nowait()   
      while(not q.empty()):
        yield q.get_nowait()   
    return run_command()
if __name__ == '__main__':
  conf = {
    '/': {
         'tools.sessions.on': True,
         'tools.staticdir.root': os.path.abspath(os.getcwd())
     },
     '/static': {
         'tools.staticdir.on': True,
         'tools.staticdir.dir': './public'
     }
   }
  q = Queue()
  cherrypy.server.socket_host = '10.49.69.103'
  cherrypy.config.update({
  'log.screen':True,
  'tools.sessions.on': True,
  'checker.on':False
})

cherrypy.tree.mount(TestProcess(), config=None)
cherrypy.engine.start()
cherrypy.engine.block()
#cherrypy.quickstart(TestProcess(), '/', conf)

Class TestScript

class TestScript(object):

q=Queue()

def write_queue(self,data):
    print "*********** TEST **********************"
    scroll_to_bottom = '<script type="text/javascript">window.scrollBy(0,50);</script>'
    if data == '\n':
      self.q.put("\n<br />%s" % scroll_to_bottom) # include the iframe scroll fix
    else:
      self.q.put(data)

def testCallFunction(self, q):
    #proc = subprocess.Popen(['python','CreateLog.py'],stdout=subprocess.PIPE)
    cmd = subprocess.Popen(['python','CreateLog.py'], shell=True, stdout=subprocess.PIPE)
    while True:
      data = cmd.stdout.read(1)   # Alternatively proc.stdout.read(1024)
      if len(data) == 0:
        break
      self.write_queue(data)   # sys.stdout.buffer.write(data) on Python 3.x
    #print "*********** TEST **********************"

脚本CreateLog.py

#filters output
import time
i = 0
while (i<=10):
   print hex(i)*512
   i += 1
   time.sleep(0.5)

运行时得到的错误

[24/Jul/2014:16:59:10] ENGINE Bus STARTING
[24/Jul/2014:16:59:10] ENGINE Started monitor thread 'Autoreloader'.
[24/Jul/2014:16:59:10] ENGINE Started monitor thread '_TimeoutMonitor'.
[24/Jul/2014:16:59:15] ENGINE Error in 'start' listener <bound method Server.sta
rt of <cherrypy._cpserver.Server object at 0x01583390>>
Traceback (most recent call last):
 File "c:\Python27\lib\site-packages\cherrypy\process\wspbus.py", line 197, in
publish
output.append(listener(*args, **kwargs))
 File "c:\Python27\lib\site-packages\cherrypy\_cpserver.py", line 151, in start

ServerAdapter.start(self)
File "c:\Python27\lib\site-packages\cherrypy\process\servers.py", line 168, in
 start
wait_for_free_port(*self.bind_addr)
 File "c:\Python27\lib\site-packages\cherrypy\process\servers.py", line 412, in
wait_for_free_port
 raise IOError("Port %r not free on %r" % (port, host))
 IOError: Port 8080 not free on '10.49.69.103'

 [24/Jul/2014:16:59:15] ENGINE Shutting down due to error in start listener:
Traceback (most recent call last):
 File "c:\Python27\lib\site-packages\cherrypy\process\wspbus.py", line 235, in
 start
self.publish('start')
 File "c:\Python27\lib\site-packages\cherrypy\process\wspbus.py", line 215, in
 publish
raise exc
 ChannelFailures: IOError("Port 8080 not free on '10.49.69.103'",)

我做错了什么？

Answer 1

请参阅16.6.3.2. Windows：

确保新的Python解释器可以安全地导入主模块，而不会导致意外的副作用（例如启动新进程）。

您没有用if __name__ == '__main__':保护TestProcess.py的最后一行，因此Process尝试运行另一台服务器。

Answer 2

端口8080不是免费的，因此HTTP服务器无法监听它。尝试netstat -anpt查看正在使用该端口的内容，或尝试“server.socket_port：8081”或其他一些免费的端口。

Python多处理/带有cherrypy的队列

2 个答案: