Re: [Qemu-devel] [PATCH 13/20] monitor: Limit QError use to command handlers

[Eric Blake]

On 05/22/2015 05:36 AM, Markus Armbruster wrote:
> The previous commits narrowed use of QError to handle_qmp_command()
> and its helpers monitor_protocol_emitter(), build_qmp_error_dict().
> Narrow it further to just the command handler call: instead of
> converting Error to QError throughout handle_qmp_command(), convert
> the QError gotten from the command handler to Error, and switch the
> helpers from QError to Error.
> 
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
>  monitor.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/monitor.c b/monitor.c
> index 71ca03f..65ef400 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -391,19 +391,19 @@ static void monitor_json_emitter(Monitor *mon, const 
> QObject *data)
>      QDECREF(json);
>  }
>  
> -static QDict *build_qmp_error_dict(const QError *err)
> +static QDict *build_qmp_error_dict(Error *err)
>  {
>      QObject *obj;
>  
> -    obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %p } }",
> -                             ErrorClass_lookup[err->err_class],
> -                             qerror_human(err));
> +    obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %s } }",
> +                             ErrorClass_lookup[error_get_class(err)],
> +                             error_get_pretty(err));

You're getting rid of one of three uses of '_jsonf.*%p' in the tree (two
in monitor.c, one in tests/check-qjson.c) [I didn't check for multi-line
instances where the format string was on a different line than the
function call].  Is it worth completely getting rid of the %p formatter,
and simplifying qobject/json-*.c accordingly, in a later patch?

[oh, and I hate that I could not find documentation on the format
strings accepted by qobject_from_jsonf; it took me forever to track down
that %i correlated to bool, when I was doing my series for "qobject" Use
'bool' for qbool]

> @@ -4984,13 +4984,12 @@ static void handle_qmp_command(JSONMessageParser 
> *parser, QList *tokens)
>      obj = json_parser_parse(tokens, NULL);
>      if (!obj) {
>          // FIXME: should be triggered in json_parser_parse()
> -        qerror_report(QERR_JSON_PARSING);
> +        error_set(&local_err, QERR_JSON_PARSING);
>          goto err_out;

Is this FIXME still valid, or are we reaching the point where it could
be replaced by an assert(obj) in a later patch?

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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