How to check whether Candidate DB is enabled using Maapi API

General
1

I’ve a requirement to verify the candidate DB is enabled in a running system using Maapi API.
Could you please let me know the API which helps in this case

2

You can use maapi_exists(). Demo using the confd_cmd tool:

$ confd_cmd -o -dd -c 'maapi_exists "/netconf-state/datastores/datastore{candidate}"' 
maapi_exists "/netconf-state/datastores/datastore{candidate}"
TRACE Connected (maapi) to ConfD
TRACE MAAPI_START_USER_SESSION  --> CONFD_OK
TRACE MAAPI_START_TRANS  --> CONFD_OK
TRACE MAAPI_EXISTS /netconf-state/datastores/datastore{candidate} --> CONFD_OK
yes
TRACE MAAPI_APPLY_TRANS  --> CONFD_OK
TRACE MAAPI_STOP_TRANS  --> CONFD_OK
TRACE MAAPI_END_USER_SESSION  --> CONFD_OK
3

Yes, but this API requires transaction Identifier right?
if that is true, should I pass db as candidate or running? what if some transaction is going on with lock while I’m startingTransaction to get transaction Identified?

4

As the “-o” flag I used with the confd_cmd tool above indicates, the transaction is started towards CONFD_OPERATIONAL

5

Thank you. Let me try with this.

6

Note that you should start your transaction as a read only transaction if you will only do a maapi_exists().
Again demoing using the confd_cmd tool:

$ confd_cmd -o -dd -c 'mrtrans; maapi_exists "/netconf-state/datastores/datastore{candidate}"'d
mrtrans ; maapi_exists "/netconf-state/datastores/datastore{candidate}" "d"
TRACE Connected (maapi) to ConfD
TRACE MAAPI_START_USER_SESSION  --> CONFD_OK
TRACE MAAPI_START_TRANS  --> CONFD_OK
TRACE MAAPI_EXISTS /netconf-state/datastores/datastore{candidate} --> CONFD_OK
no
TRACE MAAPI_END_USER_SESSION  --> CONFD_OK
7

Yes, I just need to verify only exists of candidate in first. I’m doing startTransaction and then checking exists. And finally finish transaction.
int th = maapi.startTrans(Conf.DB_OPERATIONAL, Conf.MODE_READ);
boolean exists = maapi.exists(th, “/netconf-state/datastores/datastore{candidate}”)
maapi.finishTrans(th);

Hope these statements should work in this read transaction.