Data processing ordering and module dependency

Core Engine and APIs
1

How do I implement the callpoints for an external database for the YANG modules below so that the message below can be valid? In my experiment, I see that ConfD first performs validation by invoking get_elem() to find “/citizens/citizen{John}/name”, which is not in the external database, but is being created in the same message.

module test-citizens {
namespace “http://www.example.com/yang/test-citizens”;
prefix “tc”;

organization “”;
contact “”;

container citizens {
list citizen {
key “name”;
leaf name {
type string;
}
}
}
}

module test-dependency {
namespace “http://www.example.com/yang/test-dependency”;
prefix “td”;

import test-citizens {
prefix “tc”;
}

organization “”;
contact “”;

container cities {
list city {
key “name”;
leaf name {
type string;
}
leaf mayor {
type leafref {
path “/tc:citizens/tc:citizen/tc:name”;
}
}
}
}
}

<?xml version="1.0" encoding="UTF-8"?>







td:cities
<td:city xc:operation=“create”>
td:nameSeattle</td:name>
td:mayorJohn</td:mayor>
</td:city>
</td:cities>
tc:citizens
<tc:citizen xc:operation=“create”>
tc:nameJohn</tc:name>
</tc:citizen>
</tc:citizens>


2

Can you elaborate more on your question? Please explain what do you mean by “the message below can be valid”?

3

I was wondering how ConfD replies to the edit-config message, whether it’s an error or ok.

The YANG modules and the edit-config message didn’t show up well in my initial message, so I’m attaching them with this message.

YANG modules as follows:

module test-citizens {
  namespace "http://www.example.com/yang/test-citizens";
  prefix "tc";

  organization "";
  contact "";

  container citizens {
    list citizen {
      key "name";
      leaf name {
        type string;
      }
    }
  }
}

module test-dependency {
  namespace "http://www.example.com/yang/test-dependency";
  prefix "td";

  import test-citizens {
    prefix "tc";
  }

  organization "";
  contact "";

  container cities {
    list city {
      key "name";
      leaf name {
        type string;
      }
      leaf mayor {
        type leafref {
          path "/tc:citizens/tc:citizen/tc:name";
        }
      }
    }
  }
}

NETCONF edit-config as follows:

<?xml version="1.0" encoding="UTF-8"?>
<rpc message-id="104"
     xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
     xmlns:tc="http://www.example.com/yang/test-citizens"
     xmlns:td="http://www.example.com/yang/test-dependency">
  <edit-config>
    <target>
      <running />
    </target>
    <config xmlns:xc="urn:ietf:params:xml:ns:netconf:base:1.0">
      <td:cities>
        <td:city xc:operation="create">
          <td:name>Seattle</td:name>
          <td:mayor>John</td:mayor>
        </td:city>
      </td:cities>
      <tc:citizens>
        <tc:citizen xc:operation="create">
          <tc:name>John</tc:name>
        </tc:citizen>
      </tc:citizens>
    </config>
  </edit-config>
</rpc>

module_dependency_test_yang_modules.PNG707×765 11.8 KB

module_dependency_test_edit_config.PNG698×440 10.9 KB

4

You get an OK response as follows:

21-Dec-2015::12:05:12.350 **> sess:11 read:
<hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <capabilities>
    <capability>urn:ietf:params:netconf:base:1.0</capability>
  </capabilities>
</hello>

]]>]]>
<rpc xmlns:td="http://www.example.com/yang/test-dependency" xmlns:tc="http://www.example.com/yang/test-citizens" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="104">
  <edit-config>
    <target>
      <running/>
    </target>
    <config xmlns:xc="urn:ietf:params:xml:ns:netconf:base:1.0">
      <td:cities>
        <td:city xc:operation="create">
          <td:name>Seattle</td:name>
          <td:mayor>John</td:mayor>
        </td:city>
      </td:cities>
      <tc:citizens>
        <tc:citizen xc:operation="create">
          <tc:name>John</tc:name>
        </tc:citizen>
      </tc:citizens>
    </config>
  </edit-config>
</rpc>

]]>]]>
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <get>
    <filter type="xpath" select=" cities"/>
  </get>
</rpc>

]]>]]>
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <get>
    <filter type="xpath" select=" citizens"/>
  </get>
</rpc>

]]>]]>
<rpc message-id="2" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <close-session/>
</rpc>

21-Dec-2015::12:05:12.387 **< sess:11 write:
<rpc-reply xmlns:tc="http://www.example.com/yang/test-citizens" xmlns:td="http://www.example.com/yang/test-dependency" message-id="104" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

21-Dec-2015::12:05:12.400 **< sess:11 write:
<rpc-reply message-id="1" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <data>
    <cities xmlns="http://www.example.com/yang/test-dependency">
      <city>
        <name>Seattle</name>
        <mayor>John</mayor>
      </city>
    </cities>
  </data>
</rpc-reply>

21-Dec-2015::12:05:12.401 **< sess:11 write:
<rpc-reply message-id="1" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <data>
    <citizens xmlns="http://www.example.com/yang/test-citizens">
      <citizen>
        <name>John</name>
      </citizen>
    </citizens>
  </data>
</rpc-reply>

21-Dec-2015::12:05:12.401 **< sess:11 write:
<rpc-reply message-id="2" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

**< sess:11 session closed
5

Did you try using an external database?

When I used CDB, I get an ok response.

When I used an external database, I get an error.

6

Can you share your data provider code? I can help to debug it.

7

Thanks for your demo. I got it to work now.