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strategy.go
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strategy.go
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/*
Copyright 2014 The Kubernetes Authors 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 pod
import (
"fmt"
"net"
"net/http"
"net/url"
"strconv"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/api/validation"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/registry/generic"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/fielderrors"
)
// podStrategy implements behavior for Pods
type podStrategy struct {
runtime.ObjectTyper
api.NameGenerator
}
// Strategy is the default logic that applies when creating and updating Pod
// objects via the REST API.
var Strategy = podStrategy{api.Scheme, api.SimpleNameGenerator}
// NamespaceScoped is true for pods.
func (podStrategy) NamespaceScoped() bool {
return true
}
// PrepareForCreate clears fields that are not allowed to be set by end users on creation.
func (podStrategy) PrepareForCreate(obj runtime.Object) {
pod := obj.(*api.Pod)
pod.Status = api.PodStatus{
Phase: api.PodPending,
}
}
// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
func (podStrategy) PrepareForUpdate(obj, old runtime.Object) {
newPod := obj.(*api.Pod)
oldPod := old.(*api.Pod)
newPod.Status = oldPod.Status
}
// Validate validates a new pod.
func (podStrategy) Validate(ctx api.Context, obj runtime.Object) fielderrors.ValidationErrorList {
pod := obj.(*api.Pod)
return validation.ValidatePod(pod)
}
// AllowCreateOnUpdate is false for pods.
func (podStrategy) AllowCreateOnUpdate() bool {
return false
}
// ValidateUpdate is the default update validation for an end user.
func (podStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) fielderrors.ValidationErrorList {
errorList := validation.ValidatePod(obj.(*api.Pod))
return append(errorList, validation.ValidatePodUpdate(obj.(*api.Pod), old.(*api.Pod))...)
}
// AllowUnconditionalUpdate allows pods to be overwritten
func (podStrategy) AllowUnconditionalUpdate() bool {
return true
}
// CheckGracefulDelete allows a pod to be gracefully deleted. It updates the DeleteOptions to
// reflect the desired grace value.
func (podStrategy) CheckGracefulDelete(obj runtime.Object, options *api.DeleteOptions) bool {
if options == nil {
return false
}
pod := obj.(*api.Pod)
period := int64(0)
// user has specified a value
if options.GracePeriodSeconds != nil {
period = *options.GracePeriodSeconds
} else {
// use the default value if set, or deletes the pod immediately (0)
if pod.Spec.TerminationGracePeriodSeconds != nil {
period = *pod.Spec.TerminationGracePeriodSeconds
}
}
// if the pod is not scheduled, delete immediately
if len(pod.Spec.NodeName) == 0 {
period = 0
}
// if the pod is already terminated, delete immediately
if pod.Status.Phase == api.PodFailed || pod.Status.Phase == api.PodSucceeded {
period = 0
}
// ensure the options and the pod are in sync
options.GracePeriodSeconds = &period
return true
}
type podStrategyWithoutGraceful struct {
podStrategy
}
// CheckGracefulDelete prohibits graceful deletion.
func (podStrategyWithoutGraceful) CheckGracefulDelete(obj runtime.Object, options *api.DeleteOptions) bool {
return false
}
// StrategyWithoutGraceful implements the legacy instant delele behavior.
var StrategyWithoutGraceful = podStrategyWithoutGraceful{Strategy}
type podStatusStrategy struct {
podStrategy
}
var StatusStrategy = podStatusStrategy{Strategy}
func (podStatusStrategy) PrepareForUpdate(obj, old runtime.Object) {
newPod := obj.(*api.Pod)
oldPod := old.(*api.Pod)
newPod.Spec = oldPod.Spec
newPod.DeletionTimestamp = nil
}
func (podStatusStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) fielderrors.ValidationErrorList {
// TODO: merge valid fields after update
return validation.ValidatePodStatusUpdate(obj.(*api.Pod), old.(*api.Pod))
}
// MatchPod returns a generic matcher for a given label and field selector.
func MatchPod(label labels.Selector, field fields.Selector) generic.Matcher {
return &generic.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: func(obj runtime.Object) (labels.Set, fields.Set, error) {
pod, ok := obj.(*api.Pod)
if !ok {
return nil, nil, fmt.Errorf("not a pod")
}
return labels.Set(pod.ObjectMeta.Labels), PodToSelectableFields(pod), nil
},
}
}
// PodToSelectableFields returns a label set that represents the object
// TODO: fields are not labels, and the validation rules for them do not apply.
func PodToSelectableFields(pod *api.Pod) fields.Set {
return fields.Set{
"metadata.name": pod.Name,
"spec.nodeName": pod.Spec.NodeName,
"status.phase": string(pod.Status.Phase),
}
}
// ResourceGetter is an interface for retrieving resources by ResourceLocation.
type ResourceGetter interface {
Get(api.Context, string) (runtime.Object, error)
}
func getPod(getter ResourceGetter, ctx api.Context, name string) (*api.Pod, error) {
obj, err := getter.Get(ctx, name)
if err != nil {
return nil, err
}
pod := obj.(*api.Pod)
if pod == nil {
return nil, fmt.Errorf("Unexpected object type: %#v", pod)
}
return pod, nil
}
// ResourceLocation returns a URL to which one can send traffic for the specified pod.
func ResourceLocation(getter ResourceGetter, rt http.RoundTripper, ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
// Allow ID as "podname" or "podname:port" or "scheme:podname:port".
// If port is not specified, try to use the first defined port on the pod.
scheme, name, port, valid := util.SplitSchemeNamePort(id)
if !valid {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid pod request %q", id))
}
// TODO: if port is not a number but a "(container)/(portname)", do a name lookup.
pod, err := getPod(getter, ctx, name)
if err != nil {
return nil, nil, err
}
// Try to figure out a port.
if port == "" {
for i := range pod.Spec.Containers {
if len(pod.Spec.Containers[i].Ports) > 0 {
port = fmt.Sprintf("%d", pod.Spec.Containers[i].Ports[0].ContainerPort)
break
}
}
}
loc := &url.URL{
Scheme: scheme,
}
if port == "" {
loc.Host = pod.Status.PodIP
} else {
loc.Host = net.JoinHostPort(pod.Status.PodIP, port)
}
return loc, rt, nil
}
// LogLocation returns the log URL for a pod container. If opts.Container is blank
// and only one container is present in the pod, that container is used.
func LogLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string, opts *api.PodLogOptions) (*url.URL, http.RoundTripper, error) {
pod, err := getPod(getter, ctx, name)
if err != nil {
return nil, nil, err
}
// Try to figure out a container
// If a container was provided, it must be valid
container := opts.Container
if len(container) == 0 {
if len(pod.Spec.Containers) == 1 {
container = pod.Spec.Containers[0].Name
} else {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("a container name must be specified for pod %s", name))
}
} else {
if !podHasContainerWithName(pod, container) {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("container %s is not valid for pod %s", container, name))
}
}
nodeHost := pod.Spec.NodeName
if len(nodeHost) == 0 {
// If pod has not been assigned a host, return an empty location
return nil, nil, nil
}
nodeScheme, nodePort, nodeTransport, err := connInfo.GetConnectionInfo(nodeHost)
if err != nil {
return nil, nil, err
}
params := url.Values{}
if opts.Follow {
params.Add("follow", "true")
}
if opts.Previous {
params.Add("previous", "true")
}
if opts.Timestamps {
params.Add("timestamps", "true")
}
if opts.SinceSeconds != nil {
params.Add("sinceSeconds", strconv.FormatInt(*opts.SinceSeconds, 10))
}
if opts.SinceTime != nil {
params.Add("sinceTime", opts.SinceTime.Format(time.RFC3339))
}
if opts.TailLines != nil {
params.Add("tailLines", strconv.FormatInt(*opts.TailLines, 10))
}
if opts.LimitBytes != nil {
params.Add("limitBytes", strconv.FormatInt(*opts.LimitBytes, 10))
}
loc := &url.URL{
Scheme: nodeScheme,
Host: fmt.Sprintf("%s:%d", nodeHost, nodePort),
Path: fmt.Sprintf("/containerLogs/%s/%s/%s", pod.Namespace, pod.Name, container),
RawQuery: params.Encode(),
}
return loc, nodeTransport, nil
}
func podHasContainerWithName(pod *api.Pod, containerName string) bool {
for _, c := range pod.Spec.Containers {
if c.Name == containerName {
return true
}
}
return false
}
func streamParams(params url.Values, opts runtime.Object) error {
switch opts := opts.(type) {
case *api.PodExecOptions:
if opts.Stdin {
params.Add(api.ExecStdinParam, "1")
}
if opts.Stdout {
params.Add(api.ExecStdoutParam, "1")
}
if opts.Stderr {
params.Add(api.ExecStderrParam, "1")
}
if opts.TTY {
params.Add(api.ExecTTYParam, "1")
}
for _, c := range opts.Command {
params.Add("command", c)
}
case *api.PodAttachOptions:
if opts.Stdin {
params.Add(api.ExecStdinParam, "1")
}
if opts.Stdout {
params.Add(api.ExecStdoutParam, "1")
}
if opts.Stderr {
params.Add(api.ExecStderrParam, "1")
}
if opts.TTY {
params.Add(api.ExecTTYParam, "1")
}
default:
return fmt.Errorf("Unknown object for streaming: %v", opts)
}
return nil
}
// AttachLocation returns the attach URL for a pod container. If opts.Container is blank
// and only one container is present in the pod, that container is used.
func AttachLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string, opts *api.PodAttachOptions) (*url.URL, http.RoundTripper, error) {
return streamLocation(getter, connInfo, ctx, name, opts, opts.Container, "attach")
}
// ExecLocation returns the exec URL for a pod container. If opts.Container is blank
// and only one container is present in the pod, that container is used.
func ExecLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string, opts *api.PodExecOptions) (*url.URL, http.RoundTripper, error) {
return streamLocation(getter, connInfo, ctx, name, opts, opts.Container, "exec")
}
func streamLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string, opts runtime.Object, container, path string) (*url.URL, http.RoundTripper, error) {
pod, err := getPod(getter, ctx, name)
if err != nil {
return nil, nil, err
}
// Try to figure out a container
// If a container was provided, it must be valid
if container == "" {
if len(pod.Spec.Containers) == 1 {
container = pod.Spec.Containers[0].Name
} else {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("a container name must be specified for pod %s", name))
}
} else {
if !podHasContainerWithName(pod, container) {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("container %s is not valid for pod %s", container, name))
}
}
nodeHost := pod.Spec.NodeName
if len(nodeHost) == 0 {
// If pod has not been assigned a host, return an empty location
return nil, nil, errors.NewBadRequest(fmt.Sprintf("pod %s does not have a host assigned", name))
}
nodeScheme, nodePort, nodeTransport, err := connInfo.GetConnectionInfo(nodeHost)
if err != nil {
return nil, nil, err
}
params := url.Values{}
if err := streamParams(params, opts); err != nil {
return nil, nil, err
}
loc := &url.URL{
Scheme: nodeScheme,
Host: fmt.Sprintf("%s:%d", nodeHost, nodePort),
Path: fmt.Sprintf("/%s/%s/%s/%s", path, pod.Namespace, pod.Name, container),
RawQuery: params.Encode(),
}
return loc, nodeTransport, nil
}
// PortForwardLocation returns the port-forward URL for a pod.
func PortForwardLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string) (*url.URL, http.RoundTripper, error) {
pod, err := getPod(getter, ctx, name)
if err != nil {
return nil, nil, err
}
nodeHost := pod.Spec.NodeName
if len(nodeHost) == 0 {
// If pod has not been assigned a host, return an empty location
return nil, nil, errors.NewBadRequest(fmt.Sprintf("pod %s does not have a host assigned", name))
}
nodeScheme, nodePort, nodeTransport, err := connInfo.GetConnectionInfo(nodeHost)
if err != nil {
return nil, nil, err
}
loc := &url.URL{
Scheme: nodeScheme,
Host: fmt.Sprintf("%s:%d", nodeHost, nodePort),
Path: fmt.Sprintf("/portForward/%s/%s", pod.Namespace, pod.Name),
}
return loc, nodeTransport, nil
}