python - Tornado + Momoko. Restart corrupted connection -

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we're using tornado 3.2 + momoko 1.1 + pgpool.

after restarting pgpool - have restart tornado.

if don't restart tornado - have errors these: 

[e 140322 19:23:32 web:1305] uncaught exception post /api/user/balance/ (127.0.0.1)     httprequest(protocol='http', host='127.0.0.1:3001', method='post', uri='/api/user/balance/', version='http/1.0', remote_ip='127.0.0.1', headers={'host': '127.0.0.1:3001', 'connection': 'close', 'content-type': 'application/x-www-form-urlencoded', 'content-length': '55', 'accept-encoding': 'gzip'})     traceback (most recent call last):       file "/projects/application_new/env/lib/python2.7/site-packages/tornado/web.py", line 1192, in _stack_context_handle_exception         raise_exc_info((type, value, traceback))       file "/projects/application_new/env/lib/python2.7/site-packages/tornado/web.py", line 1375, in wrapper         result = method(self, *args, **kwargs)       file "api_server.py", line 435, in post         userbalanceforjson(self.db, user_id=user_id).results(self.json_callback)       file "/projects/application_new/env/lib/python2.7/site-packages/tornado/gen.py", line 159, in wrapper         runner.run()       file "/projects/application_new/env/lib/python2.7/site-packages/tornado/gen.py", line 529, in run         yielded = self.gen.throw(*exc_info)       file "/projects/application_new/api/models/orm.py", line 16, in results         result = yield momoko.op(self.db.execute, sql, [])       file "/projects/application_new/env/lib/python2.7/site-packages/tornado/gen.py", line 520, in run         next = self.yield_point.get_result()       file "/projects/application_new/env/lib/python2.7/site-packages/momoko/utils.py", line 41, in get_result         raise error     programmingerror: execute cannot used while asynchronous query underway

i've found django users have same troubles, when using greenlets.

how avoid such situation without tornado restart?

temporary solution - close connection, if error happened in it. it, let's create class inspired momoko.op:

class opwithfallback(gen.task):     """     run single asynchronous operation.      behaves `tornado.gen.task`_, raises exception (one of psycop2's     exceptions_) when error occurs related psycopg2 or postgresql.      closes connection error.      .. _exceptions: http://initd.org/psycopg/docs/module.html#exceptions     .. _tornado.gen.task: http://www.tornadoweb.org/documentation/gen.html#tornado.gen.task     """     def get_result(self):         (result, error), _ = super(opwithfallback, self).get_result()         if error:             self.fallback(error, result)         return result      def fallback(self, error, result):         log.warning('closing dead connection or connection idle transaction: %s' % result.connection)         result.connection.close()         raise error

and let's use like: 

result = yield opwithfallback(self.db.execute, sql, [])

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