ethernet: ifconfig: T2653: move to get_config_dict()

The current VyOS CLI parser code written in Python contains a ton of duplicates
which I can also hold myself accountable for - or maybe mainly me - depends on
the angle of judge.

While providing a new update() method in vyos.ifconfig.interfaces() this is
extended for ethernet based interfaces which also supports 802.1q, 802.1ad
VLANs. This commit migrates the existing codebase for an ethernet based
interfaces and implements the missing parts for VLANs. Adding or migrating other
interfaces (e.g. bridge or bond) will become much easier as they must reuse
the entire functionality - we now walk towards a single codepath.

Thanks for all who made this combined effort possible!

Signed-off-by: Christian Poessinger <christian@poessinger.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/python/vyos/ifconfig_vlan.py b/python/vyos/ifconfig_vlan.py
index 442cb0db8..ecb6796fa 100644
--- a/python/vyos/ifconfig_vlan.py
+++ b/python/vyos/ifconfig_vlan.py
@@ -16,6 +16,30 @@
 from netifaces import interfaces
 from vyos import ConfigError
 
+def get_removed_vlans(conf, dict):
+    """
+    Common function to parse a dictionary retrieved via get_config_dict() and
+    determine any added/removed VLAN interfaces - be it 802.1q or Q-in-Q.
+    """
+    from vyos.configdiff import get_config_diff, Diff
+
+    # Check vif, vif-s/vif-c VLAN interfaces for removal
+    D = get_config_diff(conf, key_mangling=('-', '_'))
+    D.set_level(conf.get_level())
+    # get_child_nodes() will return dict_keys(), mangle this into a list with PEP448
+    keys = D.get_child_nodes_diff(['vif'], expand_nodes=Diff.DELETE)['delete'].keys()
+    dict['vif_remove'] = [*keys]
+
+    # get_child_nodes() will return dict_keys(), mangle this into a list with PEP448
+    keys = D.get_child_nodes_diff(['vif-s'], expand_nodes=Diff.DELETE)['delete'].keys()
+    dict['vif_s_remove'] = [*keys]
+
+    for vif in dict.get('vif_s', {}).keys():
+        keys = D.get_child_nodes_diff(['vif-s', vif, 'vif-c'], expand_nodes=Diff.DELETE)['delete'].keys()
+        dict['vif_s'][vif]['vif_c_remove'] = [*keys]
+
+    return dict
+
 def apply_all_vlans(intf, intfconfig):
     """
     Function applies all VLANs to the passed interface.