Test: Add ramp-up phase to nat44ed-udir tests

Change-Id: I3aa50ec1ef9b0445014daa31e767323060f4a03f
Signed-off-by: Jan Gelety <jgelety@cisco.com>

1 files changed, 28 insertions, 2 deletions

diff --git a/resources/libraries/python/NATUtil.py b/resources/libraries/python/NATUtil.py
index aabcd36cda..620e14aea1 100644
--- a/resources/libraries/python/NATUtil.py
+++ b/resources/libraries/python/NATUtil.py
@@ -13,6 +13,7 @@
 
 """NAT utilities library."""
 
+from math import log2, modf
 from pprint import pformat
 from enum import IntEnum
 
@@ -140,8 +141,10 @@ class NATUtil:
 
         :param node: Topology node.
         :type node: dict
+        :returns: NAT44 summary data.
+        :rtype: str
         """
-        PapiSocketExecutor.run_cli_cmd(node, u"show nat44 summary")
+        return PapiSocketExecutor.run_cli_cmd(node, u"show nat44 summary")
 
     @staticmethod
     def show_nat_base_data(node):
@@ -197,10 +200,33 @@ class NATUtil:
         :returns: Value of max_translations_per_thread NAT44 parameter.
         :rtype: int
         """
-        from math import log2, modf
         rest, mult = modf(log2(sessions/(10*threads)))
         return 2 ** (int(mult) + (1 if rest else 0)) * 10
 
+    @staticmethod
+    def get_nat44_sessions_number(node, proto):
+        """Get number of established NAT44 sessions from actual NAT44 mapping
+        data.
+
+        :param node: DUT node.
+        :param proto: Required protocol - TCP/UDP/ICMP.
+        :type node: dict
+        :type proto: str
+        :returns: Number of established NAT44 sessions.
+        :rtype: int
+        :raises ValueError: If not supported protocol.
+        """
+        nat44_data = dict()
+        if proto in [u"UDP", u"TCP", u"ICMP"]:
+            for line in NATUtil.show_nat44_summary(node).splitlines():
+                sum_k, sum_v = line.split(u":") if u":" in line \
+                    else (line, None)
+                nat44_data[sum_k] = sum_v.strip() if isinstance(sum_v, str) \
+                    else sum_v
+        else:
+            raise ValueError(f"Unsupported protocol: {proto}!")
+        return nat44_data.get(f"total {proto.lower()} sessions", 0)
+
     # DET44 PAPI calls
     # DET44 means deterministic mode of NAT44
     @staticmethod