networkInstanceHandler.go

package networkinstances

import (
	"fmt"

	gnmitargetygot "code.fbi.h-da.de/danet/gnmi-target/examples/example01/model"
	"code.fbi.h-da.de/danet/gnmi-target/examples/example01/osclient"
	"code.fbi.h-da.de/danet/gnmi-target/examples/example01/osclient/additions"
	"code.fbi.h-da.de/danet/gnmi-target/handler"
	"github.com/openconfig/gnmi/proto/gnmi"
	"github.com/openconfig/ygot/ygot"
	log "github.com/sirupsen/logrus"
)

// NetworkInstanceHandler is the implementation of a gnmitarget.PathHandler.
type NetworkInstanceHandler struct {
	handler.DefaultPathHandler
	osClient osclient.Osclient
}

func NewNetworkInstanceHandler() *NetworkInstanceHandler {
	return &NetworkInstanceHandler{
		DefaultPathHandler: handler.DefaultPathHandler{
			Name: "openconfig-network-instance-handler",
			Paths: map[string]struct{}{
				"/network-instances": {},
			},
		},
		osClient: osclient.NewOsClient(),
	}
}

func (yh *NetworkInstanceHandler) Init(config *handler.Config, publishToSubsFunc func([]*gnmi.Notification) error) error {
	yh.Config = config
	yh.PublishToSubs = publishToSubsFunc

	// needed for interfaces and network instances
	localInterfaces, err := yh.osClient.GetInterfaces()
	if err != nil {
		return err
	}

	for _, localInterface := range localInterfaces {
		staticRoutes, err := yh.osClient.GetStaticRoutes(*localInterface.Name)
		if err != nil {
			return err
		}

		for _, staticRoute := range staticRoutes {
			_, err := yh.updateOrCreateNetworkInstance(staticRoute)
			if err != nil {
				return err
			}
		}
	}

	//subscribe to routing table
	staticRouteChannel, err := yh.osClient.SubscribeToRoute()
	if err != nil {
		return err
	}
	go func(){
		for {
			select {
			case update := <- staticRouteChannel:
				// for _, localInterface := range localInterfaces {
				// 	staticRoutes, err := yh.osClient.GetStaticRoutes(*localInterface.Name)
				// 	if err != nil {
				// 		fmt.Println(err)
				// 	}
			
				// 	for _, staticRoute := range staticRoutes {
				// 		_, err := yh.updateOrCreateNetworkInstance(staticRoute)
				// 		if err != nil {
				// 			fmt.Println(err)
				// 		}
				// 	}
				// }
				_, err := yh.updateOrCreateNetworkInstance(update)
				if err != nil {
					fmt.Println(err)
				}
			}
		}
	}()

	return nil
}

func (yh *NetworkInstanceHandler) Update(c ygot.ValidatedGoStruct, jobs []*gnmi.Update) error {
	fmt.Println("Update request received for ", yh.Name)
	config, ok := c.(*gnmitargetygot.Gnmitarget)
	if !ok {
		return fmt.Errorf("failed type assertion for config %T", (*gnmitargetygot.Gnmitarget)(nil))
	}

	networkInstances := config.GetNetworkInstances()

	if networkInstances != nil {
		if networkInstanceMap := networkInstances.NetworkInstance; networkInstanceMap != nil {
			for _, networkInstance := range networkInstanceMap {
				if protocols := networkInstance.Protocols; protocols != nil {
					if protocolMap := protocols.Protocol; protocolMap != nil {
						// NOTE: since these are dependent on ip addresses
						// being already set; they should probably wait for the
						// completion of that task
						for _, protocol := range protocolMap {
							if staticRoutes := protocol.StaticRoutes; staticRoutes != nil {
								for _, staticRoute := range staticRoutes.Static {
									osStaticRoute := &additions.StaticRoute{}
									osStaticRoute.Prefix = staticRoute.Prefix
									for _, hop := range staticRoute.NextHops.NextHop {
										osStaticRoute.Hops = append(osStaticRoute.Hops, additions.Hop{
											InterfaceRef: hop.GetInterfaceRef().GetConfig().Interface,
											Index:        hop.Index,
											NextHop:      hop.GetConfig().GetNextHop(),
										})
									}
									if err := yh.osClient.SetStaticRoute(osStaticRoute); err != nil {
										log.Debug("Failed to set static route: ", err)
										return err
									}
								}
							}
						}
					}
				}
			}
		}
	}

	return nil
}

func (yh *NetworkInstanceHandler) updateOrCreateNetworkInstance(localStaticRoute *additions.StaticRoute) ([]*gnmi.Notification, error) {
	yh.Config.Lock()
	defer yh.Config.Unlock()

	copyCurrentConfig, err := ygot.DeepCopy(yh.Config.Data)
	if err != nil {
		return nil, err
	}

	newConfig, ok := copyCurrentConfig.(*gnmitargetygot.Gnmitarget)
	if !ok {
		return nil, fmt.Errorf("Wrong type, exptected: %T, got: %T", (*gnmitargetygot.OpenconfigInterfaces_Interfaces)(nil), copyCurrentConfig)
	}

	confNetworkInstances := newConfig.GetOrCreateNetworkInstances()

	if networkInstances := confNetworkInstances.GetOrCreateNetworkInstance("default"); networkInstances != nil && localStaticRoute != nil {
		if config := networkInstances.GetOrCreateConfig(); config != nil {
			config.Name = ygot.String("default")
		}
		if protocols := networkInstances.GetOrCreateProtocols(); protocols != nil {
			staticProtocol := protocols.GetOrCreateProtocol(gnmitargetygot.OpenconfigPolicyTypes_INSTALL_PROTOCOL_TYPE_STATIC, "STATIC")

			staticConfig := staticProtocol.GetOrCreateConfig()
			staticConfig.Identifier = gnmitargetygot.OpenconfigPolicyTypes_INSTALL_PROTOCOL_TYPE_STATIC
			staticConfig.Name = staticProtocol.Name

			staticRoutes := staticProtocol.GetOrCreateStaticRoutes()
			staticRoute := staticRoutes.GetOrCreateStatic(*localStaticRoute.Prefix)

			if localStaticRoute.RouteType == "delete"{
				if staticRoutes.Static != nil {
					delete(staticRoutes.Static, *localStaticRoute.Prefix)
					
				}
			} else  {
				staticRouteConfig := staticRoute.GetOrCreateConfig()
				staticRouteConfig.Prefix = localStaticRoute.Prefix

				staticRouteHops := staticRoute.GetOrCreateNextHops()
				// make a new map so previous unused hop gets deleted
				staticRouteHops.NextHop = make(map[string]*gnmitargetygot.OpenconfigNetworkInstance_NetworkInstances_NetworkInstance_Protocols_Protocol_StaticRoutes_Static_NextHops_NextHop)
				for _, hop := range localStaticRoute.Hops {
					staticRouteHop := staticRouteHops.GetOrCreateNextHop(*hop.Index)
					staticRouteHopConfig := staticRouteHop.GetOrCreateConfig()
					if hop.Index != nil {
						staticRouteHopConfig.Index = hop.Index
					}
					if hop.NextHop != nil {
						staticRouteHopConfig.NextHop = hop.NextHop
					}

					interfaceRef := staticRouteHop.GetOrCreateInterfaceRef()
					interfaceRefConfig := interfaceRef.GetOrCreateConfig()
					if hop.InterfaceRef != nil {
						interfaceRefConfig.Interface = hop.InterfaceRef
					}
				}
			}
		}
	}

	//validate struct
	if err := newConfig.Validate(); err != nil {
		return nil, err
	}

	notifications, err := ygot.DiffWithAtomic(yh.Config.Data, newConfig)
	if err != nil {
		return nil, err
	}

	yh.Config.Data = newConfig

	return notifications, nil
}