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etcd.go
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etcd.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 etcd
import (
"fmt"
"net/http"
"net/url"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
etcderr "k8s.io/kubernetes/pkg/api/errors/etcd"
"k8s.io/kubernetes/pkg/api/rest"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/api/validation"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/kubelet/client"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/registry/cachesize"
"k8s.io/kubernetes/pkg/registry/generic"
etcdgeneric "k8s.io/kubernetes/pkg/registry/generic/etcd"
"k8s.io/kubernetes/pkg/registry/pod"
podrest "k8s.io/kubernetes/pkg/registry/pod/rest"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/storage"
)
// PodStorage includes storage for pods and all sub resources
type PodStorage struct {
Pod *REST
Binding *BindingREST
Status *StatusREST
Log *podrest.LogREST
Proxy *podrest.ProxyREST
Exec *podrest.ExecREST
Attach *podrest.AttachREST
PortForward *podrest.PortForwardREST
}
// REST implements a RESTStorage for pods against etcd
type REST struct {
*etcdgeneric.Etcd
proxyTransport http.RoundTripper
}
// NewStorage returns a RESTStorage object that will work against pods.
func NewStorage(
s storage.Interface,
storageDecorator generic.StorageDecorator,
k client.ConnectionInfoGetter,
proxyTransport http.RoundTripper,
) PodStorage {
prefix := "/pods"
newListFunc := func() runtime.Object { return &api.PodList{} }
storageInterface := storageDecorator(
s, cachesize.GetWatchCacheSizeByResource(cachesize.Pods), &api.Pod{}, prefix, pod.Strategy, newListFunc)
store := &etcdgeneric.Etcd{
NewFunc: func() runtime.Object { return &api.Pod{} },
NewListFunc: newListFunc,
KeyRootFunc: func(ctx api.Context) string {
return etcdgeneric.NamespaceKeyRootFunc(ctx, prefix)
},
KeyFunc: func(ctx api.Context, name string) (string, error) {
return etcdgeneric.NamespaceKeyFunc(ctx, prefix, name)
},
ObjectNameFunc: func(obj runtime.Object) (string, error) {
return obj.(*api.Pod).Name, nil
},
PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
return pod.MatchPod(label, field)
},
QualifiedResource: api.Resource("pods"),
CreateStrategy: pod.Strategy,
UpdateStrategy: pod.Strategy,
DeleteStrategy: pod.Strategy,
ReturnDeletedObject: true,
Storage: storageInterface,
}
statusStore := *store
statusStore.UpdateStrategy = pod.StatusStrategy
return PodStorage{
Pod: &REST{store, proxyTransport},
Binding: &BindingREST{store: store},
Status: &StatusREST{store: &statusStore},
Log: &podrest.LogREST{Store: store, KubeletConn: k},
Proxy: &podrest.ProxyREST{Store: store, ProxyTransport: proxyTransport},
Exec: &podrest.ExecREST{Store: store, KubeletConn: k},
Attach: &podrest.AttachREST{Store: store, KubeletConn: k},
PortForward: &podrest.PortForwardREST{Store: store, KubeletConn: k},
}
}
// Implement Redirector.
var _ = rest.Redirector(&REST{})
// ResourceLocation returns a pods location from its HostIP
func (r *REST) ResourceLocation(ctx api.Context, name string) (*url.URL, http.RoundTripper, error) {
return pod.ResourceLocation(r, r.proxyTransport, ctx, name)
}
// BindingREST implements the REST endpoint for binding pods to nodes when etcd is in use.
type BindingREST struct {
store *etcdgeneric.Etcd
}
// New creates a new binding resource
func (r *BindingREST) New() runtime.Object {
return &api.Binding{}
}
var _ = rest.Creater(&BindingREST{})
// Create ensures a pod is bound to a specific host.
func (r *BindingREST) Create(ctx api.Context, obj runtime.Object) (out runtime.Object, err error) {
binding := obj.(*api.Binding)
// TODO: move me to a binding strategy
if errs := validation.ValidatePodBinding(binding); len(errs) != 0 {
return nil, errs.ToAggregate()
}
err = r.assignPod(ctx, binding.Name, binding.Target.Name, binding.Annotations)
out = &unversioned.Status{Status: unversioned.StatusSuccess}
return
}
// setPodHostAndAnnotations sets the given pod's host to 'machine' if and only if it was
// previously 'oldMachine' and merges the provided annotations with those of the pod.
// Returns the current state of the pod, or an error.
func (r *BindingREST) setPodHostAndAnnotations(ctx api.Context, podID, oldMachine, machine string, annotations map[string]string) (finalPod *api.Pod, err error) {
podKey, err := r.store.KeyFunc(ctx, podID)
if err != nil {
return nil, err
}
err = r.store.Storage.GuaranteedUpdate(ctx, podKey, &api.Pod{}, false, storage.SimpleUpdate(func(obj runtime.Object) (runtime.Object, error) {
pod, ok := obj.(*api.Pod)
if !ok {
return nil, fmt.Errorf("unexpected object: %#v", obj)
}
if pod.DeletionTimestamp != nil {
return nil, fmt.Errorf("pod %s is being deleted, cannot be assigned to a host", pod.Name)
}
if pod.Spec.NodeName != oldMachine {
return nil, fmt.Errorf("pod %v is already assigned to node %q", pod.Name, pod.Spec.NodeName)
}
pod.Spec.NodeName = machine
if pod.Annotations == nil {
pod.Annotations = make(map[string]string)
}
for k, v := range annotations {
pod.Annotations[k] = v
}
finalPod = pod
return pod, nil
}))
return finalPod, err
}
// assignPod assigns the given pod to the given machine.
func (r *BindingREST) assignPod(ctx api.Context, podID string, machine string, annotations map[string]string) (err error) {
if _, err = r.setPodHostAndAnnotations(ctx, podID, "", machine, annotations); err != nil {
err = etcderr.InterpretGetError(err, api.Resource("pods"), podID)
err = etcderr.InterpretUpdateError(err, api.Resource("pods"), podID)
if _, ok := err.(*errors.StatusError); !ok {
err = errors.NewConflict(api.Resource("pods/binding"), podID, err)
}
}
return
}
// StatusREST implements the REST endpoint for changing the status of a pod.
type StatusREST struct {
store *etcdgeneric.Etcd
}
// New creates a new pod resource
func (r *StatusREST) New() runtime.Object {
return &api.Pod{}
}
// Update alters the status subset of an object.
func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object, bool, error) {
return r.store.Update(ctx, obj)
}