Question

我有一个相当简单，天真的Python / WSGI / Pyramid网络服务器。

在使用wsgiref.simple_server.make_server()构建的服务器上使用pyramid.config.Configurator().make_wsgi_app()运行。这台服务器工作正常。

但是，它提供的应用程序有一个很多的javascript图像鼠标悬停弹出窗口。如果您在页面上运行鼠标，它可以生成20多个图像请求。这也很好（这是一个内部事物，而不是很多用户）。

但是，这样做会导致服务器发出类似错误回溯的信息：

10.1.1.4 - - [25/Apr/2014 01:56:42] "GET /*SNIP* 500 59
----------------------------------------
Exception happened during processing of request from ('10.1.1.4', 18338)
Traceback (most recent call last):
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 138, in run
    self.finish_response()
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 180, in finish_response
    self.write(data)
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 274, in write
    self.send_headers()
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 333, in send_headers
    self._write(bytes(self.headers))
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 453, in _write
    self.stdout.write(data)
  File "/usr/lib/python3.4/socket.py", line 391, in write
    return self._sock.send(b)
BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 141, in run
    self.handle_error()
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 368, in handle_error
    self.finish_response()
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 180, in finish_response
    self.write(data)
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 274, in write
    self.send_headers()
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 331, in send_headers
    if not self.origin_server or self.client_is_modern():
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 344, in client_is_modern
    return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/socketserver.py", line 306, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/usr/lib/python3.4/socketserver.py", line 332, in process_request
    self.finish_request(request, client_address)
  File "/usr/lib/python3.4/socketserver.py", line 345, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python3.4/socketserver.py", line 666, in __init__
    self.handle()
  File "/usr/lib/python3.4/wsgiref/simple_server.py", line 126, in handle
    handler.run(self.server.get_app())
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 144, in run
    self.close()
  File "/usr/lib/python3.4/wsgiref/simple_server.py", line 35, in close
    self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'

我理解为什么我收到管道错误（图像请求在图像完全转移之前被取消，因为鼠标悬停弹出已关闭），而且似乎无害。

然而，我不知道如何沉默这个追溯。我的日志中有数千个它们，它使调试实际错误成为一场噩梦。我不在乎我的管道错误，我怎么能抓住它们并且无声地吞下它们？

似乎wsgiref.simple_server.make_server()安装了一个捕获BrokenPipeError: [Errno 32] Broken pipe的内部处理程序，打印回溯，然后吞下错误。我尝试将run_server()调用包装在try-except子句中，但它没有任何效果。

Answer 1

我最后转而使用CherryPy WSGI Server。它没有遭受破坏的管道日志问题，也可能更加健壮。

它也使用了线程池，所以它也更高效（多个请求没有阻塞！）。

Answer 2

我没有找到实现这一目标的简单方法，但是，你总是可以做一些猴子补丁：

from wsgiref.handlers import BaseHandler
import sys


def ignore_broken_pipes(self): 
    if sys.exc_info()[0] != BrokenPipeError: BaseHandler.__handle_error_original_(self)

BaseHandler.__handle_error_original_ = BaseHandler.handle_error
BaseHandler.handle_error = ignore_broken_pipes

在开始的某个地方运行此代码后，您将不会看到这些烦恼。

对我来说，在wsgiref的{{1}}实施中，它看起来像是一个错误：

BaseHandler

如果此方法处理def handle_error(self): """Log current error, and send error output to client if possible""" self.log_exception(sys.exc_info()) if not self.headers_sent: self.result = self.error_output(self.environ, self.start_response) self.finish_response() # XXX else: attempt advanced recovery techniques for HTML or text?，则BrokenPipeError崩溃。如果管道坏了，我们为什么要完成响应？数据发送到哪里？

使用WSGI + Pyramid在python中消除破裂的管道错误（`[Errno 32] Broken pipe`）

2 个答案: