[libvirt] [PATCH] util: json: Allow converting a virTristate(Bool|Switch) into JSON

[Erik Skultety]

On Mon, Aug 27, 2018 at 06:17:05PM +0200, Peter Krempa wrote:
> Add a new modifier letter for virJSONValueObjectAddVArgs which will add
> a boolean value with our tristate semantics. The value is omitted when
> the _ABSENT value is used.
>
> Signed-off-by: Peter Krempa <pkrempa at redhat.com>
> ---
>  src/util/virjson.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/src/util/virjson.c b/src/util/virjson.c
> index 29530dcb15..e45f1fab06 100644
> --- a/src/util/virjson.c
> +++ b/src/util/virjson.c
> @@ -142,6 +142,8 @@ virJSONValueGetType(const virJSONValue *value)
>   *
>   * b: boolean value
>   * B: boolean value, omitted if false
> + * T: boolean value specified by a virTristate(Bool|Switch) value, omitted on
> + * the _ABSENT value
>   *
>   * d: double precision floating point number
>   * n: json null value
> @@ -266,12 +268,23 @@ virJSONValueObjectAddVArgs(virJSONValuePtr obj,
>          }   break;
>
>          case 'B':
> +        case 'T':
>          case 'b': {
>              int val = va_arg(args, int);
>
>              if (!val && type == 'B')
>                  continue;
>
> +            if (type == 'T') {
> +                if (val == VIR_TRISTATE_SWITCH_ABSENT)

Just curious, was ^this on purpose to emphasize the fact that it would really
work with TristateSwitch since both _ABSENTs == 0 or just a coincidence? I'd
probably prefer _SWITCH_ABSENT slightly more to be consistent with the enum
being tested below.

Reviewed-by: Erik Skultety <eskultet at redhat.com>

> +                    continue;
> +
> +                if (val == VIR_TRISTATE_BOOL_NO)
> +                    val = 0;
> +                else
> +                    val = 1;
> +            }
> +
>              rc = virJSONValueObjectAppendBoolean(obj, key, val);
>          }   break;
>
> --
> 2.16.2
>
> --
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