forked from contiv/vpp
/
node.go
154 lines (138 loc) · 4.53 KB
/
node.go
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// Copyright (c) 2017 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package contiv
import (
"context"
"fmt"
"strings"
"net"
"github.com/contiv/vpp/plugins/contiv/model/uid"
"github.com/ligato/cn-infra/datasync"
"github.com/ligato/vpp-agent/plugins/defaultplugins/l3plugin/model/l3"
)
// handleNodeEvents adjust VPP route configuration according to the node changes.
func (s *remoteCNIserver) handleNodeEvents(ctx context.Context, resyncChan chan datasync.ResyncEvent, changeChan chan datasync.ChangeEvent) {
for {
select {
case resyncEv := <-resyncChan:
err := s.nodeResync(resyncEv)
resyncEv.Done(err)
case changeEv := <-changeChan:
err := s.nodeChangePropageteEvent(changeEv)
changeEv.Done(err)
case <-ctx.Done():
return
}
}
}
func (s *remoteCNIserver) nodeChangePropageteEvent(dataChngEv datasync.ChangeEvent) error {
var err error
key := dataChngEv.GetKey()
if strings.HasPrefix(key, allocatedIDsKeyPrefix) {
nodeID := &uid.Identifier{}
err = dataChngEv.GetValue(nodeID)
if err != nil {
return err
}
hostID := uint8(nodeID.Id)
// route := s.getRouteToNode(conf, nodeID.Id)
if dataChngEv.GetChangeType() == datasync.Put {
// Addition of host routes
s.Logger.Info("New node discovered: ", hostID)
podsRoute, hostRoute, err := s.computeRoutesForHost(hostID)
if err != nil {
return err
}
s.Logger.Info("Adding PODs route: ", podsRoute)
s.Logger.Info("Adding host route: ", hostRoute)
if err = s.vppTxnFactory().Put().StaticRoute(podsRoute).StaticRoute(hostRoute).Send().ReceiveReply(); err != nil {
return fmt.Errorf("Can't configure vpp to add route to host %v (and its pods): %v ", hostID, err)
}
} else {
// Delete of host routes
s.Logger.Info("Node removed: ", hostID)
podsRoute, hostRoute, err := s.computeRoutesForHost(hostID)
if err != nil {
return err
}
_, podDest, err := net.ParseCIDR(podsRoute.DstIpAddr)
if err != nil {
return err
}
_, hostDest, err := net.ParseCIDR(hostRoute.DstIpAddr)
if err != nil {
return err
}
err = s.vppTxnFactory().Delete().
StaticRoute(podsRoute.VrfId, podDest, net.ParseIP(podsRoute.NextHopAddr)).
StaticRoute(hostRoute.VrfId, hostDest, net.ParseIP(hostRoute.NextHopAddr)).
Send().ReceiveReply()
if err != nil {
return fmt.Errorf("Can't configure vpp to remove route to host %v (and its pods): %v ", hostID, err)
}
}
} else {
return fmt.Errorf("Unknown key %v", key)
}
return err
}
func (s *remoteCNIserver) computeRoutesForHost(hostID uint8) (podsRoute *l3.StaticRoutes_Route, hostRoute *l3.StaticRoutes_Route, err error) {
podsRoute, err = s.routeToOtherHostPods(hostID)
if err != nil {
err = fmt.Errorf("Can't construct route to pods of host %v: %v ", hostID, err)
return
}
hostRoute, err = s.routeToOtherHostStack(hostID)
if err != nil {
err = fmt.Errorf("Can't construct route to host %v: %v ", hostID, err)
return
}
return
}
func (s *remoteCNIserver) nodeResync(dataResyncEv datasync.ResyncEvent) error {
// TODO: implement proper resync (handle deleted routes as well)
var err error
txn := s.vppTxnFactory().Put()
data := dataResyncEv.GetValues()
for prefix, it := range data {
if prefix == allocatedIDsKeyPrefix {
for {
kv, stop := it.GetNext()
if stop {
break
}
nodeID := &uid.Identifier{}
err = kv.GetValue(nodeID)
if err != nil {
return err
}
// add rhe route for this host
hostID := uint8(nodeID.Id)
if hostID != s.ipam.HostID() {
s.Logger.Info("Adding routes to host ", hostID)
podsRoute, hostRoute, err := s.computeRoutesForHost(hostID)
if err != nil {
return err
}
s.Logger.Info("Adding PODs route: ", podsRoute)
s.Logger.Info("Adding host route: ", hostRoute)
if err = s.vppTxnFactory().Put().StaticRoute(podsRoute).StaticRoute(hostRoute).Send().ReceiveReply(); err != nil {
return fmt.Errorf("Can't configure vpp to add route to host %v (and its pods): %v ", hostID, err)
}
}
}
}
}
return txn.Send().ReceiveReply()
}