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resourcechannels.go
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resourcechannels.go
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// Copyright 2015 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 common
import (
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/apps"
"k8s.io/kubernetes/pkg/apis/batch"
"k8s.io/kubernetes/pkg/apis/extensions"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
)
// ResourceChannels struct holds channels to resource lists. Each list channel is paired with
// an error channel which *must* be read sequentially: first read the list channel and then
// the error channel.
//
// This struct can be used when there are multiple clients that want to process, e.g., a
// list of pods. With this helper, the list can be read only once from the backend and
// distributed asynchronously to clients that need it.
//
// When a channel is nil, it means that no resource list is available for getting.
//
// Each channel pair can be read up to N times. N is specified upon creation of the channels.
type ResourceChannels struct {
// List and error channels to Replication Controllers.
ReplicationControllerList ReplicationControllerListChannel
// List and error channels to Replica Sets.
ReplicaSetList ReplicaSetListChannel
// List and error channels to Deployments.
DeploymentList DeploymentListChannel
// List and error channels to Daemon Sets.
DaemonSetList DaemonSetListChannel
// List and error channels to Jobs.
JobList JobListChannel
// List and error channels to Services.
ServiceList ServiceListChannel
// List and error channels to Pods.
PodList PodListChannel
// List and error channels to Events.
EventList EventListChannel
// List and error channels to Nodes.
NodeList NodeListChannel
// List and error channels to PetSets.
PetSetList PetSetListChannel
}
// ServiceListChannel is a list and error channels to Services.
type ServiceListChannel struct {
List chan *api.ServiceList
Error chan error
}
// GetServiceListChannel returns a pair of channels to a Service list and errors that both
// must be read numReads times.
func GetServiceListChannel(client client.ServicesNamespacer,
nsQuery *NamespaceQuery, numReads int) ServiceListChannel {
channel := ServiceListChannel{
List: make(chan *api.ServiceList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Services(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []api.Service
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// NodeListChannel is a list and error channels to Nodes.
type NodeListChannel struct {
List chan *api.NodeList
Error chan error
}
// GetNodeListChannel returns a pair of channels to a Node list and errors that both must be read
// numReads times.
func GetNodeListChannel(client client.NodesInterface, numReads int) NodeListChannel {
channel := NodeListChannel{
List: make(chan *api.NodeList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Nodes().List(listEverything)
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// EventListChannel is a list and error channels to Nodes.
type EventListChannel struct {
List chan *api.EventList
Error chan error
}
// GetEventListChannel returns a pair of channels to an Event list and errors that both must be read
// numReads times.
func GetEventListChannel(client client.EventNamespacer,
nsQuery *NamespaceQuery, numReads int) EventListChannel {
return GetEventListChannelWithOptions(client, nsQuery, listEverything, numReads)
}
// GetEventListChannelWithOptions is GetEventListChannel plus list options.
func GetEventListChannelWithOptions(client client.EventNamespacer,
nsQuery *NamespaceQuery, options api.ListOptions, numReads int) EventListChannel {
channel := EventListChannel{
List: make(chan *api.EventList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Events(nsQuery.ToRequestParam()).List(options)
var filteredItems []api.Event
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// PodListChannel is a list and error channels to Nodes.
type PodListChannel struct {
List chan *api.PodList
Error chan error
}
// GetPodListChannel returns a pair of channels to a Pod list and errors that both must be read
// numReads times.
func GetPodListChannel(client client.PodsNamespacer,
nsQuery *NamespaceQuery, numReads int) PodListChannel {
return GetPodListChannelWithOptions(client, nsQuery, listEverything, numReads)
}
// GetPodListChannelWithOptions is GetPodListChannel plus listing options.
func GetPodListChannelWithOptions(client client.PodsNamespacer,
nsQuery *NamespaceQuery, options api.ListOptions, numReads int) PodListChannel {
channel := PodListChannel{
List: make(chan *api.PodList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Pods(nsQuery.ToRequestParam()).List(options)
var filteredItems []api.Pod
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// ReplicationControllerListChannel is a list and error channels to Nodes.
type ReplicationControllerListChannel struct {
List chan *api.ReplicationControllerList
Error chan error
}
// GetReplicationControllerListChannel Returns a pair of channels to a
// Replication Controller list and errors that both must be read
// numReads times.
func GetReplicationControllerListChannel(client client.ReplicationControllersNamespacer,
nsQuery *NamespaceQuery, numReads int) ReplicationControllerListChannel {
channel := ReplicationControllerListChannel{
List: make(chan *api.ReplicationControllerList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.ReplicationControllers(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []api.ReplicationController
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// DeploymentListChannel is a list and error channels to Deployments.
type DeploymentListChannel struct {
List chan *extensions.DeploymentList
Error chan error
}
// GetDeploymentListChannel returns a pair of channels to a Deployment list and errors
// that both must be read numReads times.
func GetDeploymentListChannel(client client.DeploymentsNamespacer,
nsQuery *NamespaceQuery, numReads int) DeploymentListChannel {
channel := DeploymentListChannel{
List: make(chan *extensions.DeploymentList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Deployments(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []extensions.Deployment
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// ReplicaSetListChannel is a list and error channels to Replica Sets.
type ReplicaSetListChannel struct {
List chan *extensions.ReplicaSetList
Error chan error
}
// GetReplicaSetListChannel returns a pair of channels to a ReplicaSet list and
// errors that both must be read numReads times.
func GetReplicaSetListChannel(client client.ReplicaSetsNamespacer,
nsQuery *NamespaceQuery, numReads int) ReplicaSetListChannel {
return GetReplicaSetListChannelWithOptions(client, nsQuery, listEverything, numReads)
}
// GetReplicaSetListChannelWithOptions returns a pair of channels to a ReplicaSet list filtered
// by provided options and errors that both must be read numReads times.
func GetReplicaSetListChannelWithOptions(client client.ReplicaSetsNamespacer,
nsQuery *NamespaceQuery, options api.ListOptions, numReads int) ReplicaSetListChannel {
channel := ReplicaSetListChannel{
List: make(chan *extensions.ReplicaSetList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.ReplicaSets(nsQuery.ToRequestParam()).List(options)
var filteredItems []extensions.ReplicaSet
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// DaemonSetListChannel is a list and error channels to Nodes.
type DaemonSetListChannel struct {
List chan *extensions.DaemonSetList
Error chan error
}
// GetDaemonSetListChannel returns a pair of channels to a DaemonSet list and errors that
// both must be read numReads times.
func GetDaemonSetListChannel(client client.DaemonSetsNamespacer,
nsQuery *NamespaceQuery, numReads int) DaemonSetListChannel {
channel := DaemonSetListChannel{
List: make(chan *extensions.DaemonSetList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.DaemonSets(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []extensions.DaemonSet
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// JobListChannel is a list and error channels to Nodes.
type JobListChannel struct {
List chan *batch.JobList
Error chan error
}
// GetJobListChannel returns a pair of channels to a Job list and errors that
// both must be read numReads times.
func GetJobListChannel(client client.JobsNamespacer,
nsQuery *NamespaceQuery, numReads int) JobListChannel {
channel := JobListChannel{
List: make(chan *batch.JobList, numReads),
Error: make(chan error, numReads),
}
go func() {
list, err := client.Jobs(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []batch.Job
for _, item := range list.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
list.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- list
channel.Error <- err
}
}()
return channel
}
// PetSetListChannel is a list and error channels to Nodes.
type PetSetListChannel struct {
List chan *apps.PetSetList
Error chan error
}
// GetPetSetListChannel returns a pair of channels to a PetSet list and errors that
// both must be read numReads times.
func GetPetSetListChannel(client client.PetSetNamespacer,
nsQuery *NamespaceQuery, numReads int) PetSetListChannel {
channel := PetSetListChannel{
List: make(chan *apps.PetSetList, numReads),
Error: make(chan error, numReads),
}
go func() {
petSets, err := client.PetSets(nsQuery.ToRequestParam()).List(listEverything)
var filteredItems []apps.PetSet
for _, item := range petSets.Items {
if nsQuery.Matches(item.ObjectMeta.Namespace) {
filteredItems = append(filteredItems, item)
}
}
petSets.Items = filteredItems
for i := 0; i < numReads; i++ {
channel.List <- petSets
channel.Error <- err
}
}()
return channel
}
var listEverything api.ListOptions = api.ListOptions{
LabelSelector: labels.Everything(),
FieldSelector: fields.Everything(),
}