Question

我是Twisted的新手，我无法理解为什么在运行脚本时出现此错误。\

基本上，脚本由2个页面组成，第一个是调用自身的HTML表单执行阻塞方法并显示结果。当请求同时发送到服务器时，我收到此错误：

exceptions.RuntimeError：在调用Request.finish后调用请求时调用了Request.write

你知道它可以来自哪里吗？

class FormPage(Resource):    
    def render_GET(self, request):
        return
               <html>
                  <body>
                      <form method="POST">
                          <input name="the-field" type="text" />
                          <input type='submit' name='Get udl' />
                      </form>
                  </body>
               </html>

    def render_POST(self, request):
        deferred= deferToThread(my_blocking_method, arg1, arg2)
        deferred.addCallback(self.print_success, request)
        deferred.addCallback(self.print_failure, request)
        return NOT_DONE_YET

    def print_success(self, result, request):
        request.write('Request executed successfully')
        request.finish()


   def print_failure(self, err, request):
        request.write(str(err))
        request.finish()      

def run()
    root = Resource()
    root.putChild("form", FormPage())
    factory = Site(root)
    reactor.listenTCP(8880, factory)
    reactor.run()

Answer 1

我终于找到了解决方案。代码必须修改如下。需要将第二个addCallback的行更改为addErrback。

class FormPage(Resource):    
    def render_GET(self, request):
        return
            <html>
                <body>
                      <form method="POST">
                          <input name="the-field" type="text" />
                          <input type='submit' name='Get udl' />
                      </form>
                  </body>
               </html>

    def render_POST(self, request):
        deferred= deferToThread(my_blocking_method, arg1, arg2)
        deferred.addCallback(self.print_success, request)
        deferred.addErrback(self.print_failure, request)
        return NOT_DONE_YET

    def print_success(self, result, request):
        request.write('Request executed successfully')
        request.finish()


    def print_failure(self, err, request):
        request.write(str(err))
        request.finish()      

    def run()
        root = Resource()
        root.putChild("form", FormPage())
        factory = Site(root)
        reactor.listenTCP(8880, factory)
        reactor.run()

Python扭曲错误：“在调用Request.finish后调用请求时调用Request.write”

1 个答案: