246 lines
7.1 KiB
Go
246 lines
7.1 KiB
Go
/*
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Copyright 2014 Google Inc. 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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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/validation"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/minion"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
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)
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// RegistryStorage adapts a service registry into apiserver's RESTStorage model.
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type RegistryStorage struct {
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registry Registry
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cloud cloudprovider.Interface
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machines minion.Registry
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}
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// NewRegistryStorage returns a new RegistryStorage.
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func NewRegistryStorage(registry Registry, cloud cloudprovider.Interface, machines minion.Registry) apiserver.RESTStorage {
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return &RegistryStorage{
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registry: registry,
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cloud: cloud,
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machines: machines,
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}
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}
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func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
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srv := obj.(*api.Service)
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if errs := validation.ValidateService(srv); len(errs) > 0 {
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return nil, apiserver.NewInvalidErr("service", srv.ID, errs)
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}
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srv.CreationTimestamp = util.Now()
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return apiserver.MakeAsync(func() (interface{}, error) {
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// TODO: Consider moving this to a rectification loop, so that we make/remove external load balancers
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// correctly no matter what http operations happen.
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if srv.CreateExternalLoadBalancer {
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if rs.cloud == nil {
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return nil, fmt.Errorf("requested an external service, but no cloud provider supplied.")
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}
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balancer, ok := rs.cloud.TCPLoadBalancer()
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if !ok {
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return nil, fmt.Errorf("The cloud provider does not support external TCP load balancers.")
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}
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zones, ok := rs.cloud.Zones()
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if !ok {
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return nil, fmt.Errorf("The cloud provider does not support zone enumeration.")
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}
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hosts, err := rs.machines.List()
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if err != nil {
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return nil, err
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}
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zone, err := zones.GetZone()
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if err != nil {
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return nil, err
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}
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err = balancer.CreateTCPLoadBalancer(srv.ID, zone.Region, srv.Port, hosts)
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if err != nil {
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return nil, err
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}
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}
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err := rs.registry.CreateService(*srv)
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if err != nil {
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return nil, err
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}
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return rs.registry.GetService(srv.ID)
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}), nil
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}
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func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
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service, err := rs.registry.GetService(id)
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if err != nil {
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return nil, err
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}
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return apiserver.MakeAsync(func() (interface{}, error) {
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rs.deleteExternalLoadBalancer(service)
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return &api.Status{Status: api.StatusSuccess}, rs.registry.DeleteService(id)
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}), nil
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}
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func (rs *RegistryStorage) Get(id string) (interface{}, error) {
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s, err := rs.registry.GetService(id)
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if err != nil {
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return nil, err
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}
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return s, err
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}
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func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
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list, err := rs.registry.ListServices()
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if err != nil {
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return nil, err
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}
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var filtered []api.Service
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for _, service := range list.Items {
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if selector.Matches(labels.Set(service.Labels)) {
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filtered = append(filtered, service)
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}
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}
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list.Items = filtered
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return list, err
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}
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// Watch returns Services events via a watch.Interface.
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// It implements apiserver.ResourceWatcher.
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func (rs *RegistryStorage) Watch(label, field labels.Selector, resourceVersion uint64) (watch.Interface, error) {
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return rs.registry.WatchServices(label, field, resourceVersion)
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}
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func (rs RegistryStorage) New() interface{} {
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return &api.Service{}
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}
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// GetServiceEnvironmentVariables populates a list of environment variables that are use
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// in the container environment to get access to services.
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func GetServiceEnvironmentVariables(registry Registry, machine string) ([]api.EnvVar, error) {
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var result []api.EnvVar
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services, err := registry.ListServices()
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if err != nil {
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return result, err
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}
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for _, service := range services.Items {
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name := makeEnvVariableName(service.ID) + "_SERVICE_PORT"
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value := strconv.Itoa(service.Port)
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result = append(result, api.EnvVar{Name: name, Value: value})
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result = append(result, makeLinkVariables(service, machine)...)
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}
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result = append(result, api.EnvVar{Name: "SERVICE_HOST", Value: machine})
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return result, nil
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}
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func (rs *RegistryStorage) Update(obj interface{}) (<-chan interface{}, error) {
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srv := obj.(*api.Service)
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if errs := validation.ValidateService(srv); len(errs) > 0 {
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return nil, apiserver.NewInvalidErr("service", srv.ID, errs)
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}
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return apiserver.MakeAsync(func() (interface{}, error) {
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// TODO: check to see if external load balancer status changed
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err := rs.registry.UpdateService(*srv)
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if err != nil {
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return nil, err
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}
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return rs.registry.GetService(srv.ID)
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}), nil
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}
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// ResourceLocation returns a URL to which one can send traffic for the specified service.
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func (rs *RegistryStorage) ResourceLocation(id string) (string, error) {
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e, err := rs.registry.GetEndpoints(id)
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if err != nil {
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return "", err
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}
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if len(e.Endpoints) == 0 {
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return "", fmt.Errorf("no endpoints available for %v", id)
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}
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return e.Endpoints[rand.Intn(len(e.Endpoints))], nil
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}
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func (rs *RegistryStorage) deleteExternalLoadBalancer(service *api.Service) error {
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if !service.CreateExternalLoadBalancer || rs.cloud == nil {
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return nil
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}
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zones, ok := rs.cloud.Zones()
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if !ok {
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// We failed to get zone enumerator.
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// As this should have failed when we tried in "create" too,
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// assume external load balancer was never created.
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return nil
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}
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balancer, ok := rs.cloud.TCPLoadBalancer()
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if !ok {
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// See comment above.
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return nil
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}
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zone, err := zones.GetZone()
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if err != nil {
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return err
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}
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if err := balancer.DeleteTCPLoadBalancer(service.JSONBase.ID, zone.Region); err != nil {
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return err
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}
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return nil
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}
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func makeEnvVariableName(str string) string {
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return strings.ToUpper(strings.Replace(str, "-", "_", -1))
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}
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func makeLinkVariables(service api.Service, machine string) []api.EnvVar {
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prefix := makeEnvVariableName(service.ID)
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var port string
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if service.ContainerPort.Kind == util.IntstrString {
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port = service.ContainerPort.StrVal
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} else {
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port = strconv.Itoa(service.ContainerPort.IntVal)
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}
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portPrefix := prefix + "_PORT_" + makeEnvVariableName(port) + "_TCP"
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return []api.EnvVar{
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{
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Name: prefix + "_PORT",
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Value: fmt.Sprintf("tcp://%s:%d", machine, service.Port),
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},
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{
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Name: portPrefix,
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Value: fmt.Sprintf("tcp://%s:%d", machine, service.Port),
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},
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{
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Name: portPrefix + "_PROTO",
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Value: "tcp",
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},
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{
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Name: portPrefix + "_PORT",
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Value: strconv.Itoa(service.Port),
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},
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{
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Name: portPrefix + "_ADDR",
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Value: machine,
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},
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}
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}
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