// afterAction needs to be run after an action may have changed the current
// state of the tablet.
func (agent *ActionAgent) afterAction(context string, reloadSchema bool) {
log.Infof("Executing post-action change callbacks")
// Save the old tablet so callbacks can have a better idea of
// the precise nature of the transition.
oldTablet := agent.Tablet().Tablet
// Actions should have side effects on the tablet, so reload the data.
if err := agent.readTablet(); err != nil {
log.Warningf("Failed rereading tablet after %v - services may be inconsistent: %v", context, err)
} else {
if updatedTablet := actor.CheckTabletMysqlPort(agent.TopoServer, agent.Mysqld, agent.Tablet()); updatedTablet != nil {
agent.mutex.Lock()
agent._tablet = updatedTablet
agent.mutex.Unlock()
}
agent.runChangeCallback(oldTablet, context)
}
// Maybe invalidate the schema.
// This adds a dependency between tabletmanager and tabletserver,
// so it's not ideal. But I (alainjobart) think it's better
// to have up to date schema in vtocc.
if reloadSchema {
tabletserver.ReloadSchema()
}
log.Infof("Done with post-action change callbacks")
}
// StartActionLoop will start the action loop for a fake tablet,
// using ft.FakeMysqlDaemon as the backing mysqld.
func (ft *FakeTablet) StartActionLoop(t *testing.T, wr *wrangler.Wrangler) {
if ft.Done != nil {
t.Fatalf("ActionLoop for %v is already running", ft.Tablet.Alias)
}
ft.Done = make(chan struct{}, 1)
go func() {
wr.TopoServer().ActionEventLoop(ft.Tablet.Alias, func(actionPath, data string) error {
actionNode, err := actionnode.ActionNodeFromJson(data, actionPath)
if err != nil {
t.Fatalf("ActionNodeFromJson failed: %v\n%v", err, data)
}
ta := actor.NewTabletActor(nil, ft.FakeMysqlDaemon, wr.TopoServer(), ft.Tablet.Alias)
if err := ta.HandleAction(actionPath, actionNode.Action, actionNode.ActionGuid, false); err != nil {
// action may just fail for any good reason
t.Logf("HandleAction failed for %v: %v", actionNode.Action, err)
}
// this part would also be done by the agent
tablet, err := wr.TopoServer().GetTablet(ft.Tablet.Alias)
if err != nil {
t.Logf("Cannot get tablet: %v", err)
} else {
updatedTablet := actor.CheckTabletMysqlPort(wr.TopoServer(), ft.FakeMysqlDaemon, tablet)
if updatedTablet != nil {
t.Logf("Updated tablet record")
}
}
return nil
}, ft.Done)
}()
}