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common.go
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common.go
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package ovssubnet
import (
"errors"
"fmt"
log "github.com/golang/glog"
"net"
"time"
"github.com/openshift/openshift-sdn/ovssubnet/controller/kube"
"github.com/openshift/openshift-sdn/ovssubnet/controller/lbr"
"github.com/openshift/openshift-sdn/pkg/api"
"github.com/openshift/openshift-sdn/pkg/netutils"
)
type OvsController struct {
subnetRegistry api.SubnetRegistry
localIP string
localSubnet *api.Subnet
hostName string
subnetAllocator *netutils.SubnetAllocator
sig chan struct{}
ready chan struct{}
flowController FlowController
}
type FlowController interface {
Setup(localSubnet, globalSubnet string) error
AddOFRules(minionIP, localSubnet, localIP string) error
DelOFRules(minionIP, localIP string) error
}
func NewKubeController(sub api.SubnetRegistry, hostname string, selfIP string, ready chan struct{}) (*OvsController, error) {
kubeController, err := NewController(sub, hostname, selfIP, ready)
if err == nil {
kubeController.flowController = kube.NewFlowController()
}
return kubeController, err
}
func NewDefaultController(sub api.SubnetRegistry, hostname string, selfIP string, ready chan struct{}) (*OvsController, error) {
defaultController, err := NewController(sub, hostname, selfIP, ready)
if err == nil {
defaultController.flowController = lbr.NewFlowController()
}
return defaultController, err
}
func NewController(sub api.SubnetRegistry, hostname string, selfIP string, ready chan struct{}) (*OvsController, error) {
if selfIP == "" {
addrs, err := net.LookupIP(hostname)
if err != nil {
log.Errorf("Failed to lookup IP Address for %s", hostname)
return nil, err
}
for _, addr := range addrs {
if addr.String() != "127.0.0.1" {
selfIP = addr.String()
break
}
}
if selfIP == "" {
return nil, fmt.Errorf("failed to lookup valid IP Address for %s (%v)", hostname, addrs)
}
}
log.Infof("Self IP: %s.", selfIP)
return &OvsController{
subnetRegistry: sub,
localIP: selfIP,
hostName: hostname,
localSubnet: nil,
subnetAllocator: nil,
sig: make(chan struct{}),
ready: ready,
}, nil
}
func (oc *OvsController) StartMaster(sync bool, containerNetwork string, containerSubnetLength uint) error {
// wait a minute for etcd to come alive
status := oc.subnetRegistry.CheckEtcdIsAlive(60)
if !status {
log.Errorf("Etcd not running?")
return errors.New("Etcd not reachable. Sync cluster check failed.")
}
// initialize the minion key
if sync {
err := oc.subnetRegistry.InitMinions()
if err != nil {
log.Infof("Minion path already initialized.")
}
}
// initialize the subnet key?
oc.subnetRegistry.InitSubnets()
subrange := make([]string, 0)
subnets, err := oc.subnetRegistry.GetSubnets()
if err != nil {
log.Errorf("Error in initializing/fetching subnets: %v", err)
return err
}
for _, sub := range *subnets {
subrange = append(subrange, sub.Sub)
}
err = oc.subnetRegistry.WriteNetworkConfig(containerNetwork, containerSubnetLength)
if err != nil {
return err
}
oc.subnetAllocator, err = netutils.NewSubnetAllocator(containerNetwork, containerSubnetLength, subrange)
if err != nil {
return err
}
err = oc.ServeExistingMinions()
if err != nil {
log.Warningf("Error initializing existing minions: %v", err)
// no worry, we can still keep watching it.
}
go oc.watchMinions()
return nil
}
func (oc *OvsController) ServeExistingMinions() error {
minions, err := oc.subnetRegistry.GetMinions()
if err != nil {
return err
}
for _, minion := range *minions {
_, err := oc.subnetRegistry.GetSubnet(minion)
if err == nil {
// subnet already exists, continue
continue
}
err = oc.AddNode(minion)
if err != nil {
return err
}
}
return nil
}
func (oc *OvsController) AddNode(minion string) error {
sn, err := oc.subnetAllocator.GetNetwork()
if err != nil {
log.Errorf("Error creating network for minion %s.", minion)
return err
}
var minionIP string
ip := net.ParseIP(minion)
if ip == nil {
addrs, err := net.LookupIP(minion)
if err != nil {
log.Errorf("Failed to lookup IP address for minion %s: %v", minion, err)
return err
}
minionIP = addrs[0].String()
if minionIP == "" {
return fmt.Errorf("Failed to obtain IP address from minion label: %s", minion)
}
} else {
minionIP = ip.String()
}
sub := &api.Subnet{
Minion: minionIP,
Sub: sn.String(),
}
oc.subnetRegistry.CreateSubnet(minion, sub)
if err != nil {
log.Errorf("Error writing subnet to etcd for minion %s: %v", minion, sn)
return err
}
return nil
}
func (oc *OvsController) DeleteNode(minion string) error {
sub, err := oc.subnetRegistry.GetSubnet(minion)
if err != nil {
log.Errorf("Error fetching subnet for minion %s for delete operation.", minion)
return err
}
_, ipnet, err := net.ParseCIDR(sub.Sub)
if err != nil {
log.Errorf("Error parsing subnet for minion %s for deletion: %s", minion, sub.Sub)
return err
}
oc.subnetAllocator.ReleaseNetwork(ipnet)
return oc.subnetRegistry.DeleteSubnet(minion)
}
func (oc *OvsController) syncWithMaster() error {
return oc.subnetRegistry.CreateMinion(oc.hostName, oc.localIP)
}
func (oc *OvsController) StartNode(sync, skipsetup bool) error {
if sync {
err := oc.syncWithMaster()
if err != nil {
log.Errorf("Failed to register with master: %v", err)
return err
}
}
err := oc.initSelfSubnet()
if err != nil {
log.Errorf("Failed to get subnet for this host: %v", err)
return err
}
// call flow controller's setup
if !skipsetup {
// Assume we are working with IPv4
containerNetwork, err := oc.subnetRegistry.GetContainerNetwork()
if err != nil {
log.Errorf("Failed to obtain ContainerNetwork: %v", err)
return err
}
err = oc.flowController.Setup(oc.localSubnet.Sub, containerNetwork)
if err != nil {
return err
}
}
subnets, err := oc.subnetRegistry.GetSubnets()
if err != nil {
log.Errorf("Could not fetch existing subnets: %v", err)
}
for _, s := range *subnets {
oc.flowController.AddOFRules(s.Minion, s.Sub, oc.localIP)
}
go oc.watchCluster()
if oc.ready != nil {
close(oc.ready)
}
return err
}
func (oc *OvsController) initSelfSubnet() error {
// get subnet for self
for {
sub, err := oc.subnetRegistry.GetSubnet(oc.hostName)
if err != nil {
log.Errorf("Could not find an allocated subnet for minion %s: %s. Waiting...", oc.hostName, err)
time.Sleep(2 * time.Second)
continue
}
oc.localSubnet = sub
return nil
}
}
func (oc *OvsController) watchMinions() {
// watch latest?
stop := make(chan bool)
minevent := make(chan *api.MinionEvent)
go oc.subnetRegistry.WatchMinions(minevent, stop)
for {
select {
case ev := <-minevent:
switch ev.Type {
case api.Added:
_, err := oc.subnetRegistry.GetSubnet(ev.Minion)
if err != nil {
// subnet does not exist already
oc.AddNode(ev.Minion)
}
case api.Deleted:
oc.DeleteNode(ev.Minion)
}
case <-oc.sig:
log.Error("Signal received. Stopping watching of minions.")
stop <- true
return
}
}
}
func (oc *OvsController) watchCluster() {
stop := make(chan bool)
clusterEvent := make(chan *api.SubnetEvent)
go oc.subnetRegistry.WatchSubnets(clusterEvent, stop)
for {
select {
case ev := <-clusterEvent:
switch ev.Type {
case api.Added:
// add openflow rules
oc.flowController.AddOFRules(ev.Sub.Minion, ev.Sub.Sub, oc.localIP)
case api.Deleted:
// delete openflow rules meant for the minion
oc.flowController.DelOFRules(ev.Sub.Minion, oc.localIP)
}
case <-oc.sig:
stop <- true
return
}
}
}
func (oc *OvsController) Stop() {
close(oc.sig)
//oc.sig <- struct{}{}
}