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peerlist.go
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/*
This module deals with operations on the peerlist backed by Kubernetes' annotation mechanism.
*/
package main
import (
"encoding/json"
"github.com/pkg/errors"
"k8s.io/client-go/kubernetes"
"github.com/weaveworks/weave/common"
)
const (
configMapName = "weave-net"
configMapNamespace = "kube-system"
)
type peerList struct {
Peers []peerInfo
}
type peerInfo struct {
PeerName string // Weave internal unique ID
NodeName string // Kubernetes node name
}
func (pl *peerList) contains(peerName string) bool {
for _, peer := range pl.Peers {
if peer.PeerName == peerName {
return true
}
}
return false
}
func (pl *peerList) add(peerName string, name string) {
pl.Peers = append(pl.Peers, peerInfo{PeerName: peerName, NodeName: name})
}
func (pl *peerList) remove(peerNameToRemove string) {
for i := 0; i < len(pl.Peers); {
if pl.Peers[i].PeerName == peerNameToRemove {
pl.Peers = append(pl.Peers[:i], pl.Peers[i+1:]...)
} else {
i++
}
}
}
func (cml *configMapAnnotations) GetPeerList() (*peerList, error) {
var record peerList
if cml.cm == nil {
return nil, errors.New("endpoint not initialized, call Init first")
}
if recordBytes, found := cml.cm.Annotations[KubePeersAnnotationKey]; found {
if err := json.Unmarshal([]byte(recordBytes), &record); err != nil {
return nil, err
}
}
return &record, nil
}
func (cml *configMapAnnotations) UpdatePeerList(list peerList) error {
recordBytes, err := json.Marshal(list)
if err != nil {
return err
}
return cml.UpdateAnnotation(KubePeersAnnotationKey, string(recordBytes))
}
// update the list of all peers that have gone through this code path
func addMyselfToPeerList(cml *configMapAnnotations, c kubernetes.Interface, peerName, name string) (*peerList, error) {
var list *peerList
err := cml.LoopUpdate(func() error {
var err error
list, err = cml.GetPeerList()
if err != nil {
return err
}
if !list.contains(peerName) {
list.add(peerName, name)
err = cml.UpdatePeerList(*list)
if err != nil {
return err
}
}
return nil
})
return list, err
}
func checkIamInPeerList(cml *configMapAnnotations, c kubernetes.Interface, peerName string) (bool, error) {
if err := cml.Init(); err != nil {
return false, err
}
list, err := cml.GetPeerList()
if err != nil {
return false, err
}
common.Log.Debugf("[kube-peers] Checking peer %q against list %v", peerName, list)
return list.contains(peerName), nil
}