class'psycopg2.InterfaceError'：連接已關閉

Question

我正在拉我的頭髮，並準備好做一些骯髒的事情。

我正在運行nginx + django + postgresql。半我想測試我的網站，打開頁面的時候，我得到如下：

<class 'psycopg2.InterfaceError'> Python 2.7.2: /home/webapp/newavenue/bin/python 
Fri Feb 24 08:28:58 2012 
A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred. 

/home/webapp/newavenue/lib/python2.7/site-packages/flup/server/fcgi_base.py in run(self=<flup.server.fcgi_base.Request object>) 
    572    
    573   try: 
=> 574    protocolStatus, appStatus = self.server.handler(self) 
    575   except: 
    576    traceback.print_exc(file=self.stderr) 
protocolStatus undefined, appStatus undefined, self = <flup.server.fcgi_base.Request object>, self.server = <flup.server.fcgi_fork.WSGIServer object>, self.server.handler = <bound method WSGIServer.handler of <flup.server.fcgi_fork.WSGIServer object>> 
/home/webapp/newavenue/lib/python2.7/site-packages/flup/server/fcgi_base.py in handler(self=<flup.server.fcgi_fork.WSGIServer object>, req=<flup.server.fcgi_base.Request object>) 
    1157   try: 
    1158    try: 
=> 1159     result = self.application(environ, start_response) 
    1160     try: 
    1161      for data in result: 
result = None, self = <flup.server.fcgi_fork.WSGIServer object>, self.application = <django.core.handlers.wsgi.WSGIHandler object>, environ = {'CONTENT_LENGTH': '', 'CONTENT_TYPE': '', 'HTTP_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'HTTP_ACCEPT_CHARSET': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3', 'HTTP_ACCEPT_ENCODING': 'gzip,deflate,sdch', 'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.8', 'HTTP_CACHE_CONTROL': 'max-age=0', 'HTTP_CONNECTION': 'keep-alive', 'HTTP_COOKIE': 'csrftoken=8a0176b368b17af00a8563b5f95b134b; sess...e5bdd0d0a4e3092e7a9abd0029c02; django_language=en', 'HTTP_HOST': 'newavedev.zapto.org', ...}, start_response = <function start_response> 
/home/webapp/newavenue/lib/python2.7/site-packages/django/core/handlers/wsgi.py in __call__(self=<django.core.handlers.wsgi.WSGIHandler object>, environ={'CONTENT_LENGTH': '', 'CONTENT_TYPE': '', 'HTTP_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'HTTP_ACCEPT_CHARSET': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3', 'HTTP_ACCEPT_ENCODING': 'gzip,deflate,sdch', 'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.8', 'HTTP_CACHE_CONTROL': 'max-age=0', 'HTTP_CONNECTION': 'keep-alive', 'HTTP_COOKIE': 'csrftoken=8a0176b368b17af00a8563b5f95b134b; sess...e5bdd0d0a4e3092e7a9abd0029c02; django_language=en', 'HTTP_HOST': 'newavedev.zapto.org', ...}, start_response=<function start_response>) 
    272     response = self.get_response(request) 
    273   finally: 
=> 274    signals.request_finished.send(sender=self.__class__) 
    275 
    276   try: 
global signals = <module 'django.core.signals' from '/home/webapp...python2.7/site-packages/django/core/signals.pyc'>, signals.request_finished = <django.dispatch.dispatcher.Signal object>, signals.request_finished.send = <bound method Signal.send of <django.dispatch.dispatcher.Signal object>>, sender undefined, self = <django.core.handlers.wsgi.WSGIHandler object>, self.__class__ = <class 'django.core.handlers.wsgi.WSGIHandler'> 
/home/webapp/newavenue/lib/python2.7/site-packages/django/dispatch/dispatcher.py in send(self=<django.dispatch.dispatcher.Signal object>, sender=<class 'django.core.handlers.wsgi.WSGIHandler'>, **named={}) 
    170 
    171   for receiver in self._live_receivers(_make_id(sender)): 
=> 172    response = receiver(signal=self, sender=sender, **named) 
    173    responses.append((receiver, response)) 
    174   return responses 
response undefined, receiver = <function close_connection>, signal undefined, self = <django.dispatch.dispatcher.Signal object>, sender = <class 'django.core.handlers.wsgi.WSGIHandler'>, named = {} 
/home/webapp/newavenue/lib/python2.7/site-packages/django/db/__init__.py in close_connection(**kwargs={'sender': <class 'django.core.handlers.wsgi.WSGIHandler'>, 'signal': <django.dispatch.dispatcher.Signal object>}) 
    83 def close_connection(**kwargs): 
    84  for conn in connections.all(): 
=> 85   conn.close() 
    86 signals.request_finished.connect(close_connection) 
    87 
conn = <django.db.backends.postgresql_psycopg2.base.DatabaseWrapper object>, conn.close = <bound method DatabaseWrapper.close of <django.d...postgresql_psycopg2.base.DatabaseWrapper object>> 
/home/webapp/newavenue/lib/python2.7/site-packages/django/db/backends/__init__.py in close(self=<django.db.backends.postgresql_psycopg2.base.DatabaseWrapper object>) 
    242  def close(self): 
    243   if self.connection is not None: 
=> 244    self.connection.close() 
    245    self.connection = None 
    246 
self = <django.db.backends.postgresql_psycopg2.base.DatabaseWrapper object>, self.connection = <connection object at 0x1d37130; dsn: 'dbname=ne...er=postgres host=localhost port=5432', closed: 2>, self.connection.close = <built-in method close of psycopg2._psycopg.connection object> 
<class 'psycopg2.InterfaceError'>: connection already closed 
     args = ('connection already closed',) 
     cursor = None 
     message = 'connection already closed' 
     pgcode = None 
     pgerror = None 

服務器運行具有以下生成前面flup追蹤報告：

python manage.py runfcgi host=127.0.0.1 port=8000 debug=False 

莫非

我只是通過修補類似於「try：self.connection.close（）」來解決此問題，除了：繞過那條違規行嗎？它可能會工作，但我認爲這聽起來很髒（與核心混亂），我想嘗試找到一種替代解決方案。

編輯：考慮到這傢伙的做法太：註釋掉它：http://osdir.com/ml/DjangoUsers/2009-04/msg01647.html

Answer 1

我想我解決問題了。這不是真正的flup-psycopg2設置的解決方案，而是一個迴避替代方案。我從使用fcgi切換到gunicorn，並將self.connection.close（）行與「try：self.connection.close（）除外：pass」一起打包。這也解決了我使用nginx時出現的502錯誤網關問題。

此外，它似乎我的網站運行速度更快一些，這總是一個甜美的副作用。