从 1.2 升级到 2.0 后，Tornado 的 AsyncHTTPClient 不再工作

Question

我决定今晚尝试一下 Tornado 2.0，但它似乎在 ASyncHTTPClient 上为我做了很多工作。 2.0 的发行说明中没有任何内容表明我使用 ASyncHTTPClient 的方式有必要进行任何真正的更改：

[编辑：使代码更像是一个明确的、自包含的示例]

import time
import threading
import functools

import tornado.ioloop
import tornado.web
from tornado.httpclient import *

class MainHandler(tornado.web.RequestHandler):

    def perform_task(self,finish_function):
      http_client = AsyncHTTPClient()
      tornado.ioloop.IOLoop.instance().add_callback(finish_function)
      # do something
      for i in range(0,10):
        print i
        time.sleep(1)
      request = tornado.httpclient.HTTPRequest("http://10.0.1.5:8888",method="POST",body="finished countdown")
      resp = http_client.fetch(request, self.handle_request)
      return

    def join_callback(self):
      # finish the request, also returns control back to ioloop's thread.
      self.finish()

    def handle_request(self, response):
      if response.error:
          print "Error:", response.error
      else:
          print response.body

    @tornado.web.asynchronous
    def get(self):
        self.write("Kicking off.")
        a_partial = functools.partial(self.perform_task,self.join_callback)
        self.thread = threading.Thread(target=a_partial)
        self.thread.start()
        self.write("\n<br/>Done in here, out of my hands now.")

    # just so this example has something to post to
    @tornado.web.asynchronous
    def post(self):
        self.write("POSTED: %s" % (self.request.body))

application = tornado.web.Application([
    (r"/", MainHandler),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

使用默认值（非-curl) ASyncHTTPClient 我得到以下信息：

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/tornado/simple_httpclient.py", line 259, in cleanup
    yield
  File "/usr/local/lib/python2.6/dist-packages/tornado/simple_httpclient.py", line 186, in __init__
    functools.partial(self._on_connect, parsed))
  File "/usr/local/lib/python2.6/dist-packages/tornado/iostream.py", line 120, in connect
    self.socket.connect(address)
AttributeError: 'NoneType' object has no attribute 'connect'

如果我添加： Tornado.httpclient.AsyncHTTPClient.configure("tornado.curl_httpclient.CurlAsyncHTTPClient")

指定我想使用 PyCurl，我得到以下异常：

   Traceback (most recent call last):
      File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
        self.run()
      File "/usr/lib/python2.6/threading.py", line 484, in run
        self.__target(*self.__args, **self.__kwargs)
      File "migratotron.py", line 46, in perform_migration
        hc.fetch(request,success)
      File "/usr/local/lib/python2.6/dist-packages/tornado/curl_httpclient.py", line 81, in fetch
        self._process_queue()
      File "/usr/local/lib/python2.6/dist-packages/tornado/curl_httpclient.py", line 210, in _process_queue
        curl.info["headers"])
      File "/usr/local/lib/python2.6/dist-packages/tornado/curl_httpclient.py", line 276, in _curl_setup_request
        curl.setopt(pycurl.URL, request.url

)
TypeError: invalid arguments to setopt

我正在做的唯一不寻常的事情是调用这是我创建的另一个线程来做一些背景处理，它使用 add_callback 将控制权返回给 ioloop 线程。有人在 2.0 或类似的版本中见过这个吗？

Answer 1

这些错误消息有点神秘，但在这两种情况下，我认为它们是由于您的请求没有 URL（除非 callback 是 URL）。

2.0 将 ASyncHTTPClient 实现切换为 simple_httpclient （来自curl_httpclient），但我认为给出的示例在 Tornado 1.2 中也不起作用。