netdev - Re: [BPF v1] tools: bpftool: Fix JSON output when lookup fails

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Date:   Wed, 5 Jun 2019 22:10:30 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Krzesimir Nowak <krzesimir@...volk.io>, bpf@...r.kernel.org
Cc:     Alban Crequy <alban@...volk.io>,
        Iago López Galeiras <iago@...volk.io>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        Okash Khawaja <osk@...com>,
        David Calavera <david.calavera@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BPF v1] tools: bpftool: Fix JSON output when lookup fails

On 06/05/2019 09:17 PM, Krzesimir Nowak wrote:
> In commit 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros
> into functions") one case of error reporting was special cased, so it
> could report a lookup error for a specific key when dumping the map
> element. What the code forgot to do is to wrap the key and value keys
> into a JSON object, so an example output of pretty JSON dump of a
> sockhash map (which does not support looking up its values) is:
> 
> [
>     "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00"
>     ],
>     "value": {
>         "error": "Operation not supported"
>     },
>     "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01"
>     ],
>     "value": {
>         "error": "Operation not supported"
>     }
> ]
> 
> Note the key-value pairs inside the toplevel array. They should be
> wrapped inside a JSON object, otherwise it is an invalid JSON. This
> commit fixes this, so the output now is:
> 
> [{
>         "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00"
>         ],
>         "value": {
>             "error": "Operation not supported"
>         }
>     },{
>         "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01"
>         ],
>         "value": {
>             "error": "Operation not supported"
>         }
>     }
> ]
> 
> Fixes: 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros into functions")
> Cc: Quentin Monnet <quentin.monnet@...ronome.com>
> Signed-off-by: Krzesimir Nowak <krzesimir@...volk.io>

Applied, thanks!