Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [BPF v1] tools: bpftool: Fix JSON output when lookup fails
To:     Krzesimir Nowak <krzesimir@kinvolk.io>, bpf@vger.kernel.org
Cc:     Alban Crequy <alban@kinvolk.io>,
        =?UTF-8?Q?Iago_L=c3=b3pez_Galeiras?= <iago@kinvolk.io>,
        Quentin Monnet <quentin.monnet@netronome.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Jakub Kicinski <jakub.kicinski@netronome.com>,
        Stanislav Fomichev <sdf@google.com>,
        Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>,
        Okash Khawaja <osk@fb.com>,
        David Calavera <david.calavera@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20190605191707.24429-1-krzesimir@kinvolk.io>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <bd439a28-fed1-b35c-79b0-2100c58584ed@iogearbox.net>
Date:   Wed, 5 Jun 2019 22:10:30 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.3.0
MIME-Version: 1.0
In-Reply-To: <20190605191707.24429-1-krzesimir@kinvolk.io>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@netronome.com>
> Signed-off-by: Krzesimir Nowak <krzesimir@kinvolk.io>

Applied, thanks!