grpc be closed when uninstall service target

[qqwx1986]

there two problems

1. target connect will close while one target uninstall by method grpcConnectionPool::cleanup(),it's 5s interval check
   I uninstall the service of the current target. Although I refused new grpc request right now ,But I need to finish processing the grpc requests currently being processed before disconnecting

2. grpc_handle.go function hasTarget compare by pointer(target address) to check target whether exist in route.Table, code main.go method watchBackend will NewTable every time while service refresh,so if one service had three target,if just one target uninstall from service ,other two target also will closed by cleanup() ,i think it need reuse old target connect

[qqwx1986]

i resovled my problem

func (p *grpcConnectionPool) cleanup() {
	for {
		p.lock.Lock()
		table := route.GetTable()
		for target, cs := range p.connections {
			if cs.GetState() == connectivity.Shutdown {
				delete(p.connections, target)
				continue
			}
			if !hasTarget(target, table) {
				if cs.GetState() != connectivity.Ready {//delete If not ready
					log.Println("[DEBUG] grpc: cleaning up connection to", target.URL.Host,cs.GetState())
					cs.Close()
					delete(p.connections, target)
				}
			}
		}
		p.lock.Unlock()
		time.Sleep(p.cleanupInterval)
	}
}

func hasTarget(target *route.Target, table route.Table) bool {
	for _, routes := range table {
		for _, r := range routes {
			for _, t := range r.Targets {
				if target.URL.Host == t.URL.Host {//compare by HOST
					return true
				}
			}
		}
	}
	return false
}