getting extension output with python bindings

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Hi,

I'm using net-snmp 5.7.2 and the python bindings on CentOS 6. I've
added some extensions to my local net-snmp agent with the extend
keyword. They look like this:

extend galera-seqno /usr/local/sbin/galera-status.sh seqno
extend galera-status /usr/local/sbin/galera-status.sh short

With the snmp command line tools, they work as expected:
[root@db01 ~]# snmpwalk -v 2c -c public localhost
'NET-SNMP-EXTEND-MIB::nsExtendObjects'
NET-SNMP-EXTEND-MIB::nsExtendNumEntries.0 = INTEGER: 2
NET-SNMP-EXTEND-MIB::nsExtendCommand."galera-seqno" = STRING:
/usr/local/sbin/galera-status.sh
NET-SNMP-EXTEND-MIB::nsExtendCommand."galera-status" = STRING:
/usr/local/sbin/galera-status.sh
NET-SNMP-EXTEND-MIB::nsExtendArgs."galera-seqno" = STRING: seqno
NET-SNMP-EXTEND-MIB::nsExtendArgs."galera-status" = STRING: short
NET-SNMP-EXTEND-MIB::nsExtendInput."galera-seqno" = STRING:
NET-SNMP-EXTEND-MIB::nsExtendInput."galera-status" = STRING:
NET-SNMP-EXTEND-MIB::nsExtendCacheTime."galera-seqno" = INTEGER: 5
NET-SNMP-EXTEND-MIB::nsExtendCacheTime."galera-status" = INTEGER: 5
NET-SNMP-EXTEND-MIB::nsExtendExecType."galera-seqno" = INTEGER: exec(1)
NET-SNMP-EXTEND-MIB::nsExtendExecType."galera-status" = INTEGER: exec(1)
NET-SNMP-EXTEND-MIB::nsExtendRunType."galera-seqno" = INTEGER:
run-on-read(1)
NET-SNMP-EXTEND-MIB::nsExtendRunType."galera-status" = INTEGER:
run-on-read(1)
NET-SNMP-EXTEND-MIB::nsExtendStorage."galera-seqno" = INTEGER:
permanent(4)
NET-SNMP-EXTEND-MIB::nsExtendStorage."galera-status" = INTEGER:
permanent(4)
NET-SNMP-EXTEND-MIB::nsExtendStatus."galera-seqno" = INTEGER: active(1)
NET-SNMP-EXTEND-MIB::nsExtendStatus."galera-status" = INTEGER: active(1)
NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."galera-seqno" = STRING: -1
NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."galera-status" = STRING: stopped
NET-SNMP-EXTEND-MIB::nsExtendOutputFull."galera-seqno" = STRING: -1
NET-SNMP-EXTEND-MIB::nsExtendOutputFull."galera-status" = STRING: stopped
NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."galera-seqno" = INTEGER: 1
NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."galera-status" = INTEGER: 1
NET-SNMP-EXTEND-MIB::nsExtendResult."galera-seqno" = INTEGER: 0
NET-SNMP-EXTEND-MIB::nsExtendResult."galera-status" = INTEGER: 1
NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-seqno".1 = STRING: -1
NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1 = STRING: stopped

and:
[root@db01 ~]# snmpget -v 2c -c public localhost
'NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1'
NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1 = STRING: stopped

I'm doing some python scripting where I would love to get this data
over snmp, I was very pleased to discover that net-snmp comes with
python bindings.

Walking over 'NET-SNMP-EXTEND-MIB::nsExtendObjects' works:
>>> import netsnmp session = netsnmp.Session(Version = 2,
>>> DestHost="localhost",
Community="public")
>>> 
session.walk(netsnmp.VarList(netsnmp.Varbind("NET-SNMP-EXTEND-MIB::nsExtendObjects")))
('2', '/usr/local/sbin/galera-status.sh',
'/usr/local/sbin/galera-status.sh', 'seqno', 'short', None, None, '5',
'5', '1', '1', '1', '1', '4', '4', '1', '1', '-1', 'stopped', '-1',
'stopped', '1', '1', '0', '1', '-1', 'stopped')

Getting the output for both my extensions has also worked:
>>> 
session.walk(netsnmp.VarList(netsnmp.Varbind("NET-SNMP-EXTEND-MIB::nsExtendOutLine")))
('-1', 'stopped')

I can not, however, seem to get just the output for a specific extension:
>>> 
session.walk(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short"')))
()
>>> 
session.walk(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short".1')))
()
>>> 
session.get(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short".1')))
('',)

I have tried about 500 variations and have furiously googled and read
documentation, blogs, guides and tutorials... without success.

And now, in my hour of desperation, I turn to the mailing list.
Can you please point me in the right direction?

Humbly yours,
- -- 
Kenny Rasschaert
+32 497 72 27 69 | Open Source consultant - Inuits.eu
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