netdev - Re: [PATCH iproute2] ip-route: fix json formatting for metrics

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Date:   Mon, 8 Jul 2019 17:14:49 +0200
From:   Andrea Claudi <aclaudi@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH iproute2] ip-route: fix json formatting for metrics

On Mon, Jul 8, 2019 at 11:38 AM Andrea Claudi <aclaudi@...hat.com> wrote:
>
> Setting metrics for routes currently lead to non-parsable
> json output. For example:
>
> $ ip link add type dummy
> $ ip route add 192.168.2.0 dev dummy0 metric 100 mtu 1000 rto_min 3
> $ ip -j route | jq
> parse error: ':' not as part of an object at line 1, column 319
>
> Fixing this opening a json object in the metrics array and using
> print_string() instead of fprintf().
>
> This is the output for the above commands applying this patch:
>
> $ ip -j route | jq
> [
>   {
>     "dst": "192.168.2.0",
>     "dev": "dummy0",
>     "scope": "link",
>     "metric": 100,
>     "flags": [],
>     "metrics": [
>       {
>         "mtu": 1000,
>         "rto_min": 3
>       }
>     ]
>   }
> ]
>
> Fixes: 663c3cb23103f ("iproute: implement JSON and color output")
> Fixes: 968272e791710 ("iproute: refactor metrics print")
> Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
> ---
>  ip/iproute.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/ip/iproute.c b/ip/iproute.c
> index 1669e0138259e..2f9b612b0b506 100644
> --- a/ip/iproute.c
> +++ b/ip/iproute.c
> @@ -578,6 +578,7 @@ static void print_rta_metrics(FILE *fp, const struct rtattr *rta)
>         int i;
>
>         open_json_array(PRINT_JSON, "metrics");
> +       open_json_object(NULL);
>
>         parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta));
>
> @@ -611,7 +612,7 @@ static void print_rta_metrics(FILE *fp, const struct rtattr *rta)
>                         print_rtax_features(fp, val);
>                         break;
>                 default:
> -                       fprintf(fp, "%u ", val);
> +                       print_uint(PRINT_ANY, mx_names[i], "%u ", val);
>                         break;
>
>                 case RTAX_RTT:
> @@ -639,6 +640,7 @@ static void print_rta_metrics(FILE *fp, const struct rtattr *rta)
>                 }
>         }
>
> +       close_json_object();
>         close_json_array(PRINT_JSON, NULL);
>  }
>
> --
> 2.20.1
>

Sorry, I forgot to add:
Reported-by: Frank Hofmann <fhofmann@...udflare.com>

Regards,
Andrea