qapi: Inline do_qmp_dispatch() into qmp_dispatch()

Both functions check @request is a QDict, and both have code for
QCO_NO_SUCCESS_RESP.  This wasn't the case back when they were
created.  It's a sign of muddled responsibilities.  Inline.  The next
commits will clean up some more.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200317115459.31821-22-armbru@redhat.com>

qapi/qmp-dispatch.c

@@ -75,75 +75,6 @@ static QDict *qmp_dispatch_check_obj(const QObject *request, bool allow_oob,
     return dict;
 }
 
-static QObject *do_qmp_dispatch(QmpCommandList *cmds, QObject *request,
-                                bool allow_oob, Error **errp)
-{
-    Error *local_err = NULL;
-    bool oob;
-    const char *command;
-    QDict *args, *dict;
-    QmpCommand *cmd;
-    QObject *ret = NULL;
-
-    dict = qmp_dispatch_check_obj(request, allow_oob, errp);
-    if (!dict) {
-        return NULL;
-    }
-
-    command = qdict_get_try_str(dict, "execute");
-    oob = false;
-    if (!command) {
-        assert(allow_oob);
-        command = qdict_get_str(dict, "exec-oob");
-        oob = true;
-    }
-    cmd = qmp_find_command(cmds, command);
-    if (cmd == NULL) {
-        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
-                  "The command %s has not been found", command);
-        return NULL;
-    }
-    if (!cmd->enabled) {
-        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
-                  "The command %s has been disabled for this instance",
-                  command);
-        return NULL;
-    }
-    if (oob && !(cmd->options & QCO_ALLOW_OOB)) {
-        error_setg(errp, "The command %s does not support OOB",
-                   command);
-        return NULL;
-    }
-
-    if (runstate_check(RUN_STATE_PRECONFIG) &&
-        !(cmd->options & QCO_ALLOW_PRECONFIG)) {
-        error_setg(errp, "The command '%s' isn't permitted in '%s' state",
-                   cmd->name, RunState_str(RUN_STATE_PRECONFIG));
-        return NULL;
-    }
-
-    if (!qdict_haskey(dict, "arguments")) {
-        args = qdict_new();
-    } else {
-        args = qdict_get_qdict(dict, "arguments");
-        qobject_ref(args);
-    }
-
-    cmd->fn(args, &ret, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    } else if (cmd->options & QCO_NO_SUCCESS_RESP) {
-        g_assert(!ret);
-    } else if (!ret) {
-        /* TODO turn into assertion */
-        ret = QOBJECT(qdict_new());
-    }
-
-    qobject_unref(args);
-
-    return ret;
-}
-
 QDict *qmp_error_response(Error *err)
 {
     QDict *rsp;
@@ -168,11 +99,72 @@ QDict *qmp_dispatch(QmpCommandList *cmds, QObject *request,
                     bool allow_oob)
 {
     Error *err = NULL;
+    bool oob;
+    const char *command;
+    QDict *args;
+    QmpCommand *cmd;
     QDict *dict = qobject_to(QDict, request);
-    QObject *ret, *id = dict ? qdict_get(dict, "id") : NULL;
+    QObject *id = dict ? qdict_get(dict, "id") : NULL;
+    QObject *ret = NULL;
     QDict *rsp;
 
-    ret = do_qmp_dispatch(cmds, request, allow_oob, &err);
+    dict = qmp_dispatch_check_obj(request, allow_oob, &err);
+    if (!dict) {
+        goto out;
+    }
+
+    command = qdict_get_try_str(dict, "execute");
+    oob = false;
+    if (!command) {
+        assert(allow_oob);
+        command = qdict_get_str(dict, "exec-oob");
+        oob = true;
+    }
+    cmd = qmp_find_command(cmds, command);
+    if (cmd == NULL) {
+        error_set(&err, ERROR_CLASS_COMMAND_NOT_FOUND,
+                  "The command %s has not been found", command);
+        goto out;
+    }
+    if (!cmd->enabled) {
+        error_set(&err, ERROR_CLASS_COMMAND_NOT_FOUND,
+                  "The command %s has been disabled for this instance",
+                  command);
+        goto out;
+    }
+    if (oob && !(cmd->options & QCO_ALLOW_OOB)) {
+        error_setg(&err, "The command %s does not support OOB",
+                   command);
+        goto out;
+    }
+
+    if (runstate_check(RUN_STATE_PRECONFIG) &&
+        !(cmd->options & QCO_ALLOW_PRECONFIG)) {
+        error_setg(&err, "The command '%s' isn't permitted in '%s' state",
+                   cmd->name, RunState_str(RUN_STATE_PRECONFIG));
+        goto out;
+    }
+
+    if (!qdict_haskey(dict, "arguments")) {
+        args = qdict_new();
+    } else {
+        args = qdict_get_qdict(dict, "arguments");
+        qobject_ref(args);
+    }
+
+    cmd->fn(args, &ret, &err);
+    if (err) {
+        ;
+    } else if (cmd->options & QCO_NO_SUCCESS_RESP) {
+        g_assert(!ret);
+    } else if (!ret) {
+        /* TODO turn into assertion */
+        ret = QOBJECT(qdict_new());
+    }
+
+    qobject_unref(args);
+
+out:
     if (err) {
         rsp = qmp_error_response(err);
     } else if (ret) {