[port_util] add get_rif_port_map, get_vlan_interface_oid_map (#78)

* [port_util] add get_rif_port_map, get_vlan_interface_oid_map
* clear lgtm warning
* fix comments

src/swsssdk/port_util.py

@@ -11,12 +11,14 @@
 in multi-asic platform.
 """
 SONIC_ETHERNET_BP_RE_PATTERN = "^Ethernet-BP(\d+)$"
+SONIC_VLAN_RE_PATTERN = "^Vlan(\d+)$"
 SONIC_PORTCHANNEL_RE_PATTERN = "^PortChannel(\d+)$"
 SONIC_MGMT_PORT_RE_PATTERN = "^eth(\d+)$"
 
 
 class BaseIdx:
     ethernet_base_idx = 1
+    vlan_interface_base_idx = 2000
     ethernet_bp_base_idx = 9000
     portchannel_base_idx = 1000
     mgmt_port_base_idx = 10000
@@ -25,6 +27,7 @@ def get_index(if_name):
     """
     OIDs are 1-based, interfaces are 0-based, return the 1-based index
     Ethernet N = N + 1
+    Vlan N = N + 2000
     Ethernet_BP N = N + 9000
     PortChannel N = N + 1000
     eth N = N + 10000
@@ -36,13 +39,15 @@ def get_index_from_str(if_name):
     """
     OIDs are 1-based, interfaces are 0-based, return the 1-based index
     Ethernet N = N + 1
+    Vlan N = N + 2000
     Ethernet_BP N = N + 9000
     PortChannel N = N + 1000
     eth N = N + 10000
     """
     patterns = {
         SONIC_ETHERNET_RE_PATTERN: BaseIdx.ethernet_base_idx,
         SONIC_ETHERNET_BP_RE_PATTERN: BaseIdx.ethernet_bp_base_idx,
+        SONIC_VLAN_RE_PATTERN: BaseIdx.vlan_interface_base_idx,
         SONIC_PORTCHANNEL_RE_PATTERN: BaseIdx.portchannel_base_idx,
         SONIC_MGMT_PORT_RE_PATTERN: BaseIdx.mgmt_port_base_idx
     }
@@ -103,3 +108,44 @@ def get_vlan_id_from_bvid(db, bvid):
 
     return vlan_id
 
+def get_rif_port_map(db):
+    """
+        Get the RIF port mapping from ASIC DB
+    """
+    db.connect('ASIC_DB')
+    rif_keys_str = db.keys('ASIC_DB', "ASIC_STATE:SAI_OBJECT_TYPE_ROUTER_INTERFACE:*")
+    if not rif_keys_str:
+        return {}
+
+    rif_port_oid_map = {}
+    for rif_s in rif_keys_str:
+        rif_id = rif_s.lstrip(b"ASIC_STATE:SAI_OBJECT_TYPE_ROUTER_INTERFACE:oid:0x")
+        ent = db.get_all('ASIC_DB', rif_s, blocking=True)
+        if b"SAI_ROUTER_INTERFACE_ATTR_PORT_ID" in ent:
+            port_id = ent[b"SAI_ROUTER_INTERFACE_ATTR_PORT_ID"].lstrip(b"oid:0x")
+            rif_port_oid_map[rif_id] = port_id
+
+    return rif_port_oid_map
+
+def get_vlan_interface_oid_map(db):
+    """
+        Get Vlan Interface names and sai oids
+    """
+    db.connect('COUNTERS_DB')
+    rif_name_map = db.get_all('COUNTERS_DB', 'COUNTERS_RIF_NAME_MAP', blocking=True)
+    rif_type_name_map = db.get_all('COUNTERS_DB', 'COUNTERS_RIF_TYPE_MAP', blocking=True)
+
+    if not rif_name_map or not rif_type_name_map:
+        return {}
+
+    oid_pfx = len("oid:0x")
+    vlan_if_name_map = {}
+
+    for if_name, sai_oid in rif_name_map.items():
+        # Check if RIF is l3 vlan interface
+        if rif_type_name_map[sai_oid] == b'SAI_ROUTER_INTERFACE_TYPE_VLAN':
+            # Check if interface name is in style understood to be a SONiC interface
+            if get_index(if_name):
+                vlan_if_name_map[sai_oid[oid_pfx:]] = if_name
+
+    return vlan_if_name_map