ConfD User Community

Operational data tree structure

YANG
#1

How can we get tree structure of all the operational data(only config false) nodes defined in YANG model?

#2

depends on what you mean, get via some northbound interface (NETCONF/cli/restconf/…), or when using confd-lib code? (maapi_ vs cdb_, etc.)

#3

Here it’s sample yang file

module _sample {
  yang-version 1.1;
  namespace "urn:altiostar:_sample";
  prefix samplealtiostar;

  leaf userLabel {
    description
      "A user-friendly name of this object.";
    type string;
  }
  leaf userFalse {
    description
      "Operational data";
    type string;
    config false;
  }
}

Defined 2 leaves, one is config true another is config false(operational).

Using pyang tool, able to display this YANG data in tree structure as follows
pyang -f tree sample.yang

module: _sample
  +--rw userLabel?   string
  +--ro userFalse?   string

But we need only operational data to be displayed here like as follows

module: _sample
  +--ro userFalse?   string

Can we get only operational data display?

#4

Not really, I’m afraid. You might have some luck with a “script” like this:

pred='[not(.//yin:config[@value="false"])]'
pyang -f yin your-root-module.yang \
 | xmlstarlet ed -N yin=urn:ietf:params:xml:ns:yang:yin:1 \
    -d "//yin:container${pred}" \
    -d "//yin:leaf${pred}" \
    -d "//yin:list${pred}" \
    -d "//yin:leaf-list${pred}" \
 | pyang -f tree

Note it ignores choice or case statements - it’s up to you how they should be handled. But more importantly, it completely ignores augment or grouping/uses, and I’m afraid those cannot be processed with such script, if your data model uses those, I think you can either do some text-processing of the -f tree output, or write a modification of the tree pyang plugin.