Re: [Qemu-devel] [PATCH 04/12] chardev: remove many local variables in qemu_chr_parse_socket

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Jan 15, 2019 at 11:18:21PM +0400, Marc-André Lureau wrote:
> Hi
> 
> On Tue, Jan 15, 2019 at 6:53 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> >
> > Now that all validation is separated off into a separate method,
> > we can directly populate the ChardevSocket struct from the
> > QemuOpts values, avoiding many local variables.
> >
> > Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> > ---
> >  chardev/char-socket.c | 40 ++++++++++++++++++----------------------
> >  1 file changed, 18 insertions(+), 22 deletions(-)
> >
> > diff --git a/chardev/char-socket.c b/chardev/char-socket.c
> > index 233f16f72d..ba86284ea9 100644
> > --- a/chardev/char-socket.c
> > +++ b/chardev/char-socket.c
> > @@ -1186,18 +1186,10 @@ error:
> >  static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
> >                                    Error **errp)
> >  {
> > -    bool is_listen      = qemu_opt_get_bool(opts, "server", false);
> > -    bool is_waitconnect = is_listen && qemu_opt_get_bool(opts, "wait", true);
> > -    bool is_telnet      = qemu_opt_get_bool(opts, "telnet", false);
> > -    bool is_tn3270      = qemu_opt_get_bool(opts, "tn3270", false);
> > -    bool is_websock     = qemu_opt_get_bool(opts, "websocket", false);
> > -    bool do_nodelay     = !qemu_opt_get_bool(opts, "delay", true);
> > -    int64_t reconnect   = qemu_opt_get_number(opts, "reconnect", 0);
> >      const char *path = qemu_opt_get(opts, "path");
> >      const char *host = qemu_opt_get(opts, "host");
> >      const char *port = qemu_opt_get(opts, "port");
> >      const char *fd = qemu_opt_get(opts, "fd");
> > -    const char *tls_creds = qemu_opt_get(opts, "tls-creds");
> >      SocketAddressLegacy *addr;
> >      ChardevSocket *sock;
> >
> > @@ -1216,26 +1208,30 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
> >      sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
> >      qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
> >
> > -    sock->has_nodelay = true;
> > -    sock->nodelay = do_nodelay;
> > +    sock->has_nodelay = qemu_opt_get(opts, "delay");
> > +    sock->nodelay = !qemu_opt_get_bool(opts, "delay", true);
> > +    /*
> > +     * We have different default to QMP for 'server', hence
> > +     * we can't just check for existance of 'server'
> > +     */
> >      sock->has_server = true;
> > -    sock->server = is_listen;
> > -    sock->has_telnet = true;
> > -    sock->telnet = is_telnet;
> > -    sock->has_tn3270 = true;
> > -    sock->tn3270 = is_tn3270;
> > -    sock->has_websocket = true;
> > -    sock->websocket = is_websock;
> > +    sock->server = qemu_opt_get_bool(opts, "server", false);
> > +    sock->has_telnet = qemu_opt_get(opts, "telnet");
> > +    sock->telnet = qemu_opt_get_bool(opts, "telnet", false);
> > +    sock->has_tn3270 = qemu_opt_get(opts, "tn3270");
> > +    sock->tn3270 = qemu_opt_get_bool(opts, "tn3270", false);
> > +    sock->has_websocket = qemu_opt_get(opts, "websocket");
> > +    sock->websocket = qemu_opt_get_bool(opts, "websocket", false);
> >      /*
> >       * We have different default to QMP for 'wait' when 'server'
> >       * is set, hence we can't just check for existance of 'wait'
> >       */
> > -    sock->has_wait = qemu_opt_find(opts, "wait") || is_listen;
> > -    sock->wait = is_waitconnect;
> > +    sock->has_wait = qemu_opt_find(opts, "wait") || sock->server;
> > +    sock->wait = qemu_opt_get_bool(opts, "wait", true);
> 
> That changes slightly the behaviour, since wait was not parsed before
> when !is_listen.
>
> Since we are "correcting" (breaking?) things anyway in previous patches too:

Yes, in the !is_listen case, the previous patch will see has_wait == true
and raise an error.  So this patch is not a change in behaviour wrt the
previous patch, but the series as a whole is a change in behaviour due to
reporting errors for bad "wait" usage in clients.


> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> 
> >      sock->has_reconnect = qemu_opt_find(opts, "reconnect");
> > -    sock->reconnect = reconnect;
> > -    sock->has_tls_creds = tls_creds;
> > -    sock->tls_creds = g_strdup(tls_creds);
> > +    sock->reconnect = qemu_opt_get_number(opts, "reconnect", 0);
> > +    sock->has_tls_creds = qemu_opt_get(opts, "tls-creds");
> > +    sock->tls_creds = g_strdup(qemu_opt_get(opts, "tls-creds"));
> >
> >      addr = g_new0(SocketAddressLegacy, 1);
> >      if (path) {

Regards,
Daniel
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