Event notifications: Sockets are not closed when the subscription is disabled

[khromenokroman]

clispec

notify("Получить нотификации из backend"), cli_notify("transactions_stream", "1", "xml");
no("Команда отмены") notify("Отключить нотификации из backend"), cli_notify("transactions_stream", "0", "xml");

run systemctl restart clixon-backend.service

$ netstat -an | grep clixon
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock

run cli command show configuration candidate cli

$ netstat -an | grep clixon
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     13536    /var/run/clixon/clixon-pc.sock

then I do it a few more times show configuration candidate cli

$ netstat -an | grep clixon
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     13536    /var/run/clixon/clixon-pc.sock

everything all right

now I'm subscribing to withdrawals notify the subscription is running well

$ netstat -an | grep clixon
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     13536    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     15380    /var/run/clixon/clixon-pc.sock

now I unsubscribe no notify
when unsubscribing, the rpc is not sent that I unsubscribed, but when subscribing it is sent, is this how it should be?

$ netstat -an | grep clixon
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     13536    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     15380    /var/run/clixon/clixon-pc.sock

and the socket does not close

now I'm subscribing to withdrawals notify the subscription is running well

$ netstat -an | grep clixon
unix  3      [ ]         STREAM     CONNECTED     15383    /var/run/clixon/clixon-pc.sock
unix  2      [ ACC ]     STREAM     LISTENING     13470    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     13536    /var/run/clixon/clixon-pc.sock
unix  3      [ ]         STREAM     CONNECTED     15380    /var/run/clixon/clixon-pc.sock

and sockets are created this way but not closed, is that how it should be?

[olofhagsand]

Yes.
If a client process creates a subscription a new session is created.
When the process is exited, the session is closed.
However, if a client process creates a subscription, closes it, and the makes a new subscription, the old session is still up.
According to RFC 1588 the client should issue a NETCONF close_session for the subscription session, but does not.

[olofhagsand]

The primary thing that needs implemented is a session-id negotiating mechanism.
This is done in NETCONF via the hello protocol, but RFC5277 does not mention a way to do this.
One may need to look at RFC 8639/8640 as well.