125 lines
3.7 KiB
Go
125 lines
3.7 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package service
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import (
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"net"
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"reflect"
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"time"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/master/ports"
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"github.com/golang/glog"
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)
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const (
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SCHEDULER_SERVICE_NAME = "k8sm-scheduler"
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)
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func (m *SchedulerServer) newServiceWriter(publishedAddress net.IP, stop <-chan struct{}) func() {
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return func() {
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for {
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// Update service & endpoint records.
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// TODO(k8s): when it becomes possible to change this stuff,
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// stop polling and start watching.
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if err := m.createSchedulerServiceIfNeeded(SCHEDULER_SERVICE_NAME, ports.SchedulerPort); err != nil {
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glog.Errorf("Can't create scheduler service: %v", err)
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}
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if publishedAddress == nil {
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publishedAddress = net.IP(m.address)
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}
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if err := m.setEndpoints(SCHEDULER_SERVICE_NAME, publishedAddress, m.port); err != nil {
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glog.Errorf("Can't create scheduler endpoints: %v", err)
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}
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select {
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case <-stop:
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return
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case <-time.After(10 * time.Second):
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}
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}
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}
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}
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// createSchedulerServiceIfNeeded will create the specified service if it
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// doesn't already exist.
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func (m *SchedulerServer) createSchedulerServiceIfNeeded(serviceName string, servicePort int) error {
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ctx := api.NewDefaultContext()
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if _, err := m.client.Core().Services(api.NamespaceValue(ctx)).Get(serviceName); err == nil {
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// The service already exists.
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return nil
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}
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svc := &api.Service{
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ObjectMeta: api.ObjectMeta{
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Name: serviceName,
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Namespace: api.NamespaceDefault,
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Labels: map[string]string{"provider": "k8sm", "component": "scheduler"},
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},
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Spec: api.ServiceSpec{
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Ports: []api.ServicePort{{Port: int32(servicePort), Protocol: api.ProtocolTCP}},
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// maintained by this code, not by the pod selector
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Selector: nil,
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SessionAffinity: api.ServiceAffinityNone,
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},
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}
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if m.serviceAddress != nil {
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svc.Spec.ClusterIP = m.serviceAddress.String()
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}
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_, err := m.client.Core().Services(api.NamespaceValue(ctx)).Create(svc)
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if err != nil && errors.IsAlreadyExists(err) {
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err = nil
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}
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return err
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}
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// setEndpoints sets the endpoints for the given service.
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// in a multi-master scenario only the master will be publishing an endpoint.
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// see SchedulerServer.bootstrap.
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func (m *SchedulerServer) setEndpoints(serviceName string, ip net.IP, port int) error {
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// The setting we want to find.
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want := []api.EndpointSubset{{
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Addresses: []api.EndpointAddress{{IP: ip.String()}},
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Ports: []api.EndpointPort{{Port: int32(port), Protocol: api.ProtocolTCP}},
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}}
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ctx := api.NewDefaultContext()
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e, err := m.client.Endpoints(api.NamespaceValue(ctx)).Get(serviceName)
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createOrUpdate := m.client.Endpoints(api.NamespaceValue(ctx)).Update
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if err != nil {
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if errors.IsNotFound(err) {
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createOrUpdate = m.client.Endpoints(api.NamespaceValue(ctx)).Create
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}
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e = &api.Endpoints{
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ObjectMeta: api.ObjectMeta{
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Name: serviceName,
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Namespace: api.NamespaceDefault,
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},
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}
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}
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if !reflect.DeepEqual(e.Subsets, want) {
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e.Subsets = want
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glog.Infof("Setting endpoints for master service %q to %#v", serviceName, e)
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_, err = createOrUpdate(e)
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return err
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}
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// We didn't make any changes, no need to actually call update.
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return nil
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}
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