feat(papi): add async mode, use it in scale calls

+ Introduce two explicit handling modes to save memory in scale test.
+ Connect in async mode for both handling modes (to avoid reconnects).
+ Support both pre- and post-37758 VPP PAPI async behavior.
+ Use control-ping in dumps to emulate sync mode.
+ Do not use it for single reply to avoid VPP-2033.
+ Fix call sites to get their replies with correct handling mode.
+ Drain enqueued replies to avoid subsequent errors.
+ Retry if read returns None too early.
+ Update docstrings.
- Complexity issues reported by pylint postponed, needs larger refactor.
- Explicit replace of VAT is done in subsequent changes.

Ticket: CSIT-1547 CSIT-1671

Change-Id: I3c63fa5c578975cc4dd7fce0babe3ab04ec15ed3
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/resources/libraries/python/NATUtil.py b/resources/libraries/python/NATUtil.py
index 5d3d131c80..e5f530ab46 100644
--- a/resources/libraries/python/NATUtil.py
+++ b/resources/libraries/python/NATUtil.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2022 Cisco and/or its affiliates.
+# Copyright (c) 2023 Cisco and/or its affiliates.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
@@ -182,10 +182,9 @@ class NATUtil:
             """Delete and re-add the NAT range setting."""
             with PapiSocketExecutor(node) as papi_exec:
                 args_in[u"is_add"] = False
-                papi_exec.add(cmd, **args_in)
+                papi_exec.add(cmd, **args_in).get_reply(err_msg)
                 args_in[u"is_add"] = True
-                papi_exec.add(cmd, **args_in)
-                papi_exec.get_replies(err_msg)
+                papi_exec.add(cmd, **args_in).get_reply(err_msg)
 
         return resetter
 
@@ -427,10 +426,9 @@ class NATUtil:
             """Delete and re-add the deterministic NAT mapping."""
             with PapiSocketExecutor(node) as papi_exec:
                 args_in[u"is_add"] = False
-                papi_exec.add(cmd, **args_in)
+                papi_exec.add(cmd, **args_in).get_reply(err_msg)
                 args_in[u"is_add"] = True
-                papi_exec.add(cmd, **args_in)
-                papi_exec.get_replies(err_msg)
+                papi_exec.add(cmd, **args_in).get_reply(err_msg)
 
         return resetter