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package rtmirror
import (
"context"
"crypto/sha1"
"io"
"sync"
risapi "github.com/bio-routing/bio-rd/cmd/ris/api"
"github.com/bio-routing/bio-rd/route"
routeapi "github.com/bio-routing/bio-rd/route/api"
"github.com/bio-routing/bio-rd/routingtable"
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
"google.golang.org/grpc"
log "github.com/sirupsen/logrus"
)
// RTMirror provides an deduplicated mirror of a router/vrf/afi routing table from a multiple RIS instances
type RTMirror struct {
cfg Config
rt *routingtable.RoutingTable
routes map[[20]byte]*routeContainer
routesMu sync.Mutex
grpcClients []*grpc.ClientConn
stop chan struct{}
wg sync.WaitGroup
}
// Config is a route mirror config
type Config struct {
Router string
VRF string
IPVersion uint8
}
// New creates a new RTMirror and starts it
func New(clientConns []*grpc.ClientConn, cfg Config) *RTMirror {
rtm := &RTMirror{
cfg: cfg,
routes: make(map[[20]byte]*routeContainer),
rt: routingtable.NewRoutingTable(),
grpcClients: clientConns,
stop: make(chan struct{}),
}
for _, ris := range rtm.grpcClients {
rtm.wg.Add(1)
go rtm.client(ris)
}
return rtm
}
func (rtm *RTMirror) addRIS(addr string) error {
cc, err := grpc.Dial(addr, grpc.WithInsecure())
if err != nil {
return errors.Wrap(err, "grpc dial failed")
}
rtm.grpcClients = append(rtm.grpcClients, cc)
return nil
}
// Dispose stops the RTMirror
func (rtm *RTMirror) Dispose() {
close(rtm.stop)
for _, cc := range rtm.grpcClients {
cc.Close()
}
rtm.wg.Wait()
}
func (rtm *RTMirror) client(cc *grpc.ClientConn) {
defer rtm.wg.Done()
risc := risapi.NewRoutingInformationServiceClient(cc)
var afisafi risapi.ObserveRIBRequest_AFISAFI
switch rtm.cfg.IPVersion {
case 4:
afisafi = risapi.ObserveRIBRequest_IPv4Unicast
case 6:
afisafi = risapi.ObserveRIBRequest_IPv6Unicast
}
for {
if rtm.stopped() {
return
}
orc, err := risc.ObserveRIB(context.Background(), &risapi.ObserveRIBRequest{
Router: rtm.cfg.Router,
Vrf: rtm.cfg.VRF,
Afisafi: afisafi,
}, grpc.WaitForReady(true))
if err != nil {
log.WithError(err).Error("ObserveRIB call failed")
continue
}
err = rtm.clientServiceLoop(cc, orc)
if err != nil {
log.WithError(err).Error("client service loop failed")
}
rtm.dropRoutesFromRIS(cc)
}
}
func (rtm *RTMirror) dropRoutesFromRIS(cc *grpc.ClientConn) {
rtm.routesMu.Lock()
defer rtm.routesMu.Unlock()
for h, rc := range rtm.routes {
rtm._delRoute(h, cc, rc.route)
}
}
func (rtm *RTMirror) stopped() bool {
select {
case <-rtm.stop:
return true
default:
return false
}
}
func (rtm *RTMirror) clientServiceLoop(cc *grpc.ClientConn, orc risapi.RoutingInformationService_ObserveRIBClient) error {
for {
if rtm.stopped() {
return nil
}
u, err := orc.Recv()
if err != nil {
if err == io.EOF {
return nil
}
return errors.Wrap(err, "recv failed")
}
if u.Advertisement {
rtm.addRoute(cc, u.Route)
continue
}
rtm.delRoute(cc, u.Route)
}
}
func (rtm *RTMirror) addRoute(cc *grpc.ClientConn, r *routeapi.Route) {
h, err := hashRoute(r)
if err != nil {
log.WithError(err).Error("Hashing failed")
return
}
rtm.routesMu.Lock()
defer rtm.routesMu.Unlock()
if _, exists := rtm.routes[h]; !exists {
rtm.routes[h] = newRouteContainer(r, cc)
s := route.RouteFromProtoRoute(r, true)
rtm.rt.AddPath(s.Prefix(), s.Paths()[0])
return
}
rtm.routes[h].addSource(cc)
}
func (rtm *RTMirror) delRoute(cc *grpc.ClientConn, r *routeapi.Route) {
h, err := hashRoute(r)
if err != nil {
log.WithError(err).Error("Hashing failed")
return
}
rtm.routesMu.Lock()
defer rtm.routesMu.Unlock()
if _, exists := rtm.routes[h]; !exists {
return
}
rtm._delRoute(h, cc, r)
}
func (rtm *RTMirror) _delRoute(h [20]byte, cc *grpc.ClientConn, r *routeapi.Route) {
rtm.routes[h].removeSource(cc)
if rtm.routes[h].srcCount() > 0 {
return
}
s := route.RouteFromProtoRoute(r, true)
rtm.rt.RemovePath(s.Prefix(), s.Paths()[0])
delete(rtm.routes, h)
}
// GetRoutingTable exposes the routing table mirrored
func (rtm *RTMirror) GetRoutingTable() *routingtable.RoutingTable {
return rtm.rt
}
func hashRoute(route *routeapi.Route) ([20]byte, error) {
m, err := proto.Marshal(route)
if err != nil {
return [20]byte{}, errors.Wrap(err, "Proto marshal failed")
}
h := sha1.New()
_, err = h.Write(m)
if err != nil {
return [20]byte{}, errors.Wrap(err, "Write failed")
}
res := [20]byte{}
x := h.Sum(nil)
copy(res[:], x)
return res, nil
}