netfilter buglog - Feb 2021 - [Bug 1499] New: python3-nftables wrong return code when working with JSON

https://bugzilla.netfilter.org/show_bug.cgi?id=1499

            Bug ID: 1499
           Summary: python3-nftables wrong return code when working with
                    JSON
           Product: nftables
           Version: unspecified
          Hardware: x86_64
                OS: Debian GNU/Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: arturo at netfilter.org

Original bug report in the Debian bug tracker:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981857



I am using the python wrapper in a program and faced a problem.
Trying to list a Table while the Ruleset is empty returns an error, no problem
yet.
Every subsequent call to json_cmd() on the same nftables.Nftables class
instance returns -1 in return code.

Here is a short script reproducing the error :

###### testNFTABLES.py ++

import nftables
import json

nft = nftables.Nftables()
nft.set_json_output(True)

flushRulesetCMD = '{ "nftables": [ { "flush": {
"ruleset": null }} ]}'
getTableCMD = '{ "nftables": [ { "list": {
"table": { "family": "inet", "name":
"FooTable" }}} ]}'
addTableCMD = '{ "nftables": [ { "add": {
"table": { "family": "inet", "name":
"FooTable" }}} ]}'

result = nft.json_cmd(json.loads(flushRulesetCMD))
print(result)

result = nft.json_cmd(json.loads(getTableCMD))
print(result)

# Resetting Nftables class instance makes it work
# nft = nftables.Nftables()

result = nft.json_cmd(json.loads(addTableCMD))
print(result)

###### testNFTABLES.py --

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