Merger example - Connection lost

[FandaOG]

Hi,

I use merger https://ldaptor.readthedocs.io/en/latest/cookbook/merger.html I've got a problem. I have 2 LDAP servers. Sometime one LDAP server is offline. How can I handle if LDAP is offline (1st is online 2nd is offline I expect I should get response from 1st LDAP but I got infinite pending loop)? Thanks.

Current behavior is:

1. request ldapsearch -x -H ldap://merger.test:389 "uid=test"
2. I get error on merger server:

2021-07-22T09:16:33+0000 [twisted.internet.defer#critical] 


	Traceback (most recent call last):


	  File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 330, in addCallbacks
	    self._runCallbacks()


	  File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 662, in _runCallbacks
	    current.result = callback(current.result, *args, **kw)


	  File "/usr/local/lib/python3.8/site-packages/ldaptor/protocols/ldap/merger.py", line 120, in _handleUnknown
	    self._whenConnected(self._clientQueue, request, controls, reply)


	  File "/usr/local/lib/python3.8/site-packages/ldaptor/protocols/ldap/merger.py", line 36, in _whenConnected
	    return defer.maybeDeferred(fn, *a, **kw)

	--- <exception caught here> ---

	  File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 167, in maybeDeferred

	    result = f(*args, **kw)


	  File "/usr/local/lib/python3.8/site-packages/ldaptor/protocols/ldap/merger.py", line 59, in _clientQueue
	    d = c.send_multiResponse(request, self._gotResponse, reply)


	  File "/usr/local/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapclient.py", line 128, in send_multiResponse
	    msg = self._send(op)


	  File "/usr/local/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapclient.py", line 81, in _send
	    raise LDAPClientConnectionLostException()


	ldaptor.protocols.ldap.ldapclient.LDAPClientConnectionLostException: Connection lost

3. ldapsearch does not get the response (one user exists) it is in infinite pending on data