[NETCONF-367] Error parsing namespace when using YANG PATCH with absolute target path

Mon, 31 Jan 2022 11:07:36 +0000

When we try to create and merge with an absolute target path, it works well.
The namespace can be solved based on the value of the operation.
Request as below:
Request as below:
PATCH http://localhost:8181/restconf/config/network-topology:network-topology/topology/topology-netconf/node/iosxrv-7/yang-ext:mount/
Payload as below:
<yang-patch xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-patch">
<patch-id>VPN-CREATION-1</patch-id>
<comment>Create VPN-1</comment>
<edit>
<edit-id>1</edit-id>
<operation>create</operation>
<target>/Cisco-IOS-XR-infra-rsi-cfg:vrfs/vrf</target>
<value>
<vrf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-infra-rsi-cfg">
<vrf-name>vpn-78</vrf-name>
<create></create>
<afs>
<af>
<af-name>ipv6</af-name>
<saf-name>unicast</saf-name>
<topology-name>default</topology-name>
<create></create>
</af>
<af>
<af-name>ipv4</af-name>
<saf-name>unicast</saf-name>
<topology-name>default</topology-name>
<create></create>
<bgp xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-bgp-cfg">
<import-route-targets>
<route-targets>
<route-target>
<type>as</type>
<as-or-four-byte-as>
<as-xx>0</as-xx>
<as>4804</as>
<as-index>1</as-index>
<stitching-rt>0</stitching-rt>
</as-or-four-byte-as>
</route-target>
</route-targets>
</import-route-targets>
<export-route-targets>
<route-targets>
<route-target>
<type>as</type>
<as-or-four-byte-as>
<as-xx>0</as-xx>
<as>4804</as>
<as-index>1</as-index>
<stitching-rt>0</stitching-rt>
</as-or-four-byte-as>
</route-target>
</route-targets>
</export-route-targets>
</bgp>
</af>
</afs>
<description>vrf for VPN which connects each site from iosxrv-7 and iosxrv-8</description>
<vpn-id>
<vpn-oui>4804</vpn-oui>
<vpn-index>1</vpn-index>
</vpn-id>
</vrf>
</value>
</edit>
<edit>
<edit-id>2</edit-id>
<operation>create</operation>
<target>/Cisco-IOS-XR-ifmgr-cfg:interface-configurations/interface-configuration</target>
<value>
<interface-configuration xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ifmgr-cfg">
<active>act</active>
<interface-name>Loopback1</interface-name>
<interface-virtual></interface-virtual>
<ipv4-network xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-io-cfg">
<addresses>
<primary>
<address>7.7.7.7</address>
<netmask>255.255.255.255</netmask>
</primary>
</addresses>
</ipv4-network>
<vrf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-infra-rsi-cfg">vpn-78</vrf>
</interface-configuration>
</value>
</edit>
<edit>
<edit-id>3</edit-id>
<operation>merge</operation>
<target>/Cisco-IOS-XR-ipv4-bgp-cfg:bgp/instance/default/instance-as/0/four-byte-as/4804/vrfs/vrf</target>
<value>
<vrf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-bgp-cfg">
<vrf-name>vpn-78</vrf-name>
<vrf-global>
<route-distinguisher>
<as-xx>0</as-xx>
<as>4804</as>
<type>as</type>
<as-index>1</as-index>
</route-distinguisher>
<exists></exists>
<vrf-global-afs>
<vrf-global-af>
<af-name>ipv4-unicast</af-name>
<enable></enable>
<connected-routes></connected-routes>
<static-routes></static-routes>
</vrf-global-af>
</vrf-global-afs>
</vrf-global>
</vrf>
</value>
</edit>
</yang-patch>

However, when we try to delete or remove with an absolute target path, restconf returns an error of 400. Message is "Error parsing input: null".
Request as below:
PATCH http://localhost:8181/restconf/config/network-topology:network-topology/topology/topology-netconf/node/iosxrv-7/yang-ext:mount/
Payload as below:
<yang-patch xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-patch">
<patch-id>VPN-DELETION-1</patch-id>
<comment>Delete VPN-1</comment>
<edit>
<edit-id>1</edit-id>
<operation>remove</operation>
<target>/Cisco-IOS-XR-ipv4-bgp-cfg:bgp/instance/default/instance-as/0/four-byte-as/4804/vrfs/vrf/vpn-78</target>
</edit>
</yang-patch>

According to my inspection, it can be located to org.opendaylight.netconf.sal.rest.impl.XmlToPATCHBodyReader:147-154
The namespace is resolved to "netconf:base:1.0" because the request URI is root and there is no value can be used to resolve the namespace.

OpenDaylight JIRA

[NETCONF-367] Error parsing namespace when using YANG PATCH with absolute target path