// +build windows

package libnetwork

import (
	"runtime"

	"github.com/Microsoft/hcsshim"
	log "github.com/Sirupsen/logrus"
	"github.com/docker/libnetwork/drivers/windows"
)

func executeInCompartment(compartmentID uint32, x func()) {
	runtime.LockOSThread()

	if err := hcsshim.SetCurrentThreadCompartmentId(compartmentID); err != nil {
		log.Error(err)
	}
	defer func() {
		hcsshim.SetCurrentThreadCompartmentId(0)
		runtime.UnlockOSThread()
	}()

	x()
}

func (n *network) startResolver() {
	n.resolverOnce.Do(func() {
		log.Debugf("Launching DNS server for network", n.Name())
		options := n.Info().DriverOptions()
		hnsid := options[windows.HNSID]

		hnsresponse, err := hcsshim.HNSNetworkRequest("GET", hnsid, "")
		if err != nil {
			log.Errorf("Resolver Setup/Start failed for container %s, %q", n.Name(), err)
			return
		}

		for _, subnet := range hnsresponse.Subnets {
			if subnet.GatewayAddress != "" {
				resolver := NewResolver(subnet.GatewayAddress, false, "", n)
				log.Debugf("Binding a resolver on network %s gateway %s", n.Name(), subnet.GatewayAddress)
				executeInCompartment(hnsresponse.DNSServerCompartment, resolver.SetupFunc(53))
				if err = resolver.Start(); err != nil {
					log.Errorf("Resolver Setup/Start failed for container %s, %q", n.Name(), err)
				} else {
					n.resolver = append(n.resolver, resolver)
				}
			}
		}
	})
}