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minioncontroller.go
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/
minioncontroller.go
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/*
Copyright 2014 Google Inc. All rights reserved.
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 controller
import (
"fmt"
"time"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/golang/glog"
)
type MinionController struct {
cloud cloudprovider.Interface
matchRE string
staticResources *api.NodeResources
minions []string
kubeClient client.Interface
}
// NewMinionController returns a new minion controller to sync instances from cloudprovider.
func NewMinionController(
cloud cloudprovider.Interface,
matchRE string,
minions []string,
staticResources *api.NodeResources,
kubeClient client.Interface) *MinionController {
return &MinionController{
cloud: cloud,
matchRE: matchRE,
minions: minions,
staticResources: staticResources,
kubeClient: kubeClient,
}
}
// Run starts syncing instances from cloudprovider periodically, or create initial minion list.
func (s *MinionController) Run(period time.Duration) {
if s.cloud != nil && len(s.matchRE) > 0 {
go util.Forever(func() { s.SyncCloud() }, period)
} else {
go s.SyncStatic(period)
}
}
// SyncStatic registers list of machines from command line flag. It returns after successful
// registration of all machines.
func (s *MinionController) SyncStatic(period time.Duration) error {
registered := util.NewStringSet()
for {
for _, minionID := range s.minions {
if registered.Has(minionID) {
continue
}
_, err := s.kubeClient.Minions().Create(&api.Minion{
ObjectMeta: api.ObjectMeta{Name: minionID},
Spec: api.NodeSpec{
Capacity: s.staticResources.Capacity,
},
})
if err == nil {
registered.Insert(minionID)
}
}
if registered.Len() == len(s.minions) {
return nil
}
time.Sleep(period)
}
return nil
}
// SyncCloud syncs list of instances from cloudprovider to master etcd registry.
func (s *MinionController) SyncCloud() error {
matches, err := s.cloudMinions()
if err != nil {
return err
}
minions, err := s.kubeClient.Minions().List()
if err != nil {
return err
}
minionMap := make(map[string]*api.Minion)
for _, minion := range minions.Items {
minionMap[minion.Name] = &minion
}
// Create or delete minions from registry.
for _, minion := range matches.Items {
if _, ok := minionMap[minion.Name]; !ok {
glog.Infof("Create minion in registry: %s", minion.Name)
_, err = s.kubeClient.Minions().Create(&minion)
if err != nil {
glog.Errorf("Create minion error: %s", minion.Name)
}
}
delete(minionMap, minion.Name)
}
for minionID := range minionMap {
glog.Infof("Delete minion from registry: %s", minionID)
err = s.kubeClient.Minions().Delete(minionID)
if err != nil {
glog.Errorf("Delete minion error: %s", minionID)
}
}
return nil
}
// cloudMinions constructs and returns api.MinionList from cloudprovider.
func (s *MinionController) cloudMinions() (*api.MinionList, error) {
instances, ok := s.cloud.Instances()
if !ok {
return nil, fmt.Errorf("cloud doesn't support instances")
}
matches, err := instances.List(s.matchRE)
if err != nil {
return nil, err
}
result := &api.MinionList{
Items: make([]api.Minion, len(matches)),
}
for i := range matches {
result.Items[i].Name = matches[i]
resources, err := instances.GetNodeResources(matches[i])
if err != nil {
return nil, err
}
if resources == nil {
resources = s.staticResources
}
if resources != nil {
result.Items[i].Spec.Capacity = resources.Capacity
}
}
return result, nil
}