interfaces: mirror: T3089: Fix the dependency problem between interfaces

Since the dependency problem has not been solved before,
if the monitoring interface does not exist when the
mirror rule is created, the execution will be abnormal

1 files changed, 42 insertions, 0 deletions

diff --git a/python/vyos/configdict.py b/python/vyos/configdict.py
index 99c1ae2e4..b299f4a18 100644
--- a/python/vyos/configdict.py
+++ b/python/vyos/configdict.py
@@ -221,6 +221,44 @@ def is_member(conf, interface, intftype=None):
     old_level = conf.set_level(old_level)
     return ret_val
 
+def is_monitor_intf(conf,interface,direction=None):
+    """
+    Check whether the passed interface is the mirror monitoring interface of 
+    other interfaces of the specified type.
+    direction is optional, if not passed it will search all known direction
+    (currently ingress and egress)
+
+    Returns:
+    None -> Interface is not a monitor interface
+    Array() -> This interface is a monitor interface of interfaces
+    """
+    
+    directions = ['ingress', 'egress']
+    if direction not in directions + [None]:
+        raise ValueError(f'unknown interface mirror direction "{direction}"')
+    
+    direction = directions if direction == None else [direction]
+    
+    ret_val = []
+    old_level = conf.get_level()
+    conf.set_level([])
+    base = ['interfaces']
+    
+    for dire in direction:
+        for iftype in conf.list_nodes(base):
+            iftype_base = base + [iftype]
+            for intf in conf.list_nodes(iftype_base):
+                mirror = iftype_base + [intf, 'mirror', dire, interface]
+                if conf.exists(mirror):
+                    ret_val.append({intf : dire})
+    
+    old_level = conf.set_level(old_level)
+    if len(ret_val) == 0:
+        return None
+    else:
+        return ret_val
+    
+
 def has_vlan_subinterface_configured(conf, intf):
     """
     Checks if interface has an VLAN subinterface configured.
@@ -334,6 +372,10 @@ def get_interface_dict(config, base, ifname=''):
     # Check if we are a member of a bridge device
     bridge = is_member(config, ifname, 'bridge')
     if bridge: dict.update({'is_bridge_member' : bridge})
+    
+    # Check if it is a monitor interface
+    mirror = is_monitor_intf(config, ifname)
+    if mirror: dict.update({'is_monitor_intf' : mirror})
 
     # Check if we are a member of a bond device
     bond = is_member(config, ifname, 'bonding')