func (r *Reflector) listAndWatch(stopCh <-chan struct{}) {
var resourceVersion string
resyncCh, cleanup := r.resyncChan()
defer cleanup()
list, err := r.listerWatcher.List()
if err != nil {
util.HandleError(fmt.Errorf("%s: Failed to list %v: %v", r.name, r.expectedType, err))
return
}
meta, err := meta.Accessor(list)
if err != nil {
util.HandleError(fmt.Errorf("%s: Unable to understand list result %#v", r.name, list))
return
}
resourceVersion = meta.ResourceVersion()
items, err := runtime.ExtractList(list)
if err != nil {
util.HandleError(fmt.Errorf("%s: Unable to understand list result %#v (%v)", r.name, list, err))
return
}
if err := r.syncWith(items); err != nil {
util.HandleError(fmt.Errorf("%s: Unable to sync list result: %v", r.name, err))
return
}
r.setLastSyncResourceVersion(resourceVersion)
for {
w, err := r.listerWatcher.Watch(resourceVersion)
if err != nil {
switch err {
case io.EOF:
// watch closed normally
case io.ErrUnexpectedEOF:
glog.V(1).Infof("%s: Watch for %v closed with unexpected EOF: %v", r.name, r.expectedType, err)
default:
util.HandleError(fmt.Errorf("%s: Failed to watch %v: %v", r.name, r.expectedType, err))
}
// If this is "connection refused" error, it means that most likely apiserver is not responsive.
// It doesn't make sense to re-list all objects because most likely we will be able to restart
// watch where we ended.
// If that's the case wait and resend watch request.
if urlError, ok := err.(*url.Error); ok {
if opError, ok := urlError.Err.(*net.OpError); ok {
if errno, ok := opError.Err.(syscall.Errno); ok && errno == syscall.ECONNREFUSED {
time.Sleep(time.Second)
continue
}
}
}
return
}
if err := r.watchHandler(w, &resourceVersion, resyncCh, stopCh); err != nil {
if err != errorResyncRequested && err != errorStopRequested {
util.HandleError(fmt.Errorf("%s: watch of %v ended with: %v", r.name, r.expectedType, err))
}
return
}
}
}
// GetReference returns an ObjectReference which refers to the given
// object, or an error if the object doesn't follow the conventions
// that would allow this.
func GetReference(obj runtime.Object) (*ObjectReference, error) {
if obj == nil {
return nil, ErrNilObject
}
if ref, ok := obj.(*ObjectReference); ok {
// Don't make a reference to a reference.
return ref, nil
}
meta, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
_, kind, err := Scheme.ObjectVersionAndKind(obj)
if err != nil {
return nil, err
}
version := versionFromSelfLink.FindStringSubmatch(meta.SelfLink())
if len(version) < 2 {
return nil, fmt.Errorf("unexpected self link format: '%v'; got version '%v'", meta.SelfLink(), version)
}
return &ObjectReference{
Kind: kind,
APIVersion: version[1],
Name: meta.Name(),
Namespace: meta.Namespace(),
UID: meta.UID(),
ResourceVersion: meta.ResourceVersion(),
}, nil
}
// watchHandler watches w and keeps *resourceVersion up to date.
func (r *Reflector) watchHandler(w watch.Interface, resourceVersion *string, resyncCh <-chan time.Time, stopCh <-chan struct{}) error {
start := time.Now()
eventCount := 0
// Stopping the watcher should be idempotent and if we return from this function there's no way
// we're coming back in with the same watch interface.
defer w.Stop()
loop:
for {
select {
case <-stopCh:
return errorStopRequested
case <-resyncCh:
return errorResyncRequested
case event, ok := <-w.ResultChan():
if !ok {
break loop
}
if event.Type == watch.Error {
return apierrs.FromObject(event.Object)
}
if e, a := r.expectedType, reflect.TypeOf(event.Object); e != a {
util.HandleError(fmt.Errorf("%s: expected type %v, but watch event object had type %v", r.name, e, a))
continue
}
meta, err := meta.Accessor(event.Object)
if err != nil {
util.HandleError(fmt.Errorf("%s: unable to understand watch event %#v", r.name, event))
continue
}
switch event.Type {
case watch.Added:
r.store.Add(event.Object)
case watch.Modified:
r.store.Update(event.Object)
case watch.Deleted:
// TODO: Will any consumers need access to the "last known
// state", which is passed in event.Object? If so, may need
// to change this.
r.store.Delete(event.Object)
default:
util.HandleError(fmt.Errorf("%s: unable to understand watch event %#v", r.name, event))
}
*resourceVersion = meta.ResourceVersion()
r.setLastSyncResourceVersion(*resourceVersion)
eventCount++
}
}
watchDuration := time.Now().Sub(start)
if watchDuration < 1*time.Second && eventCount == 0 {
glog.V(4).Infof("%s: Unexpected watch close - watch lasted less than a second and no items received", r.name)
return errors.New("very short watch")
}
glog.V(4).Infof("%s: Watch close - %v total %v items received", r.name, r.expectedType, eventCount)
return nil
}
// GetReference returns an ObjectReference which refers to the given
// object, or an error if the object doesn't follow the conventions
// that would allow this.
// TODO: should take a meta.Interface see https://github.com/GoogleCloudPlatform/kubernetes/issues/7127
func GetReference(obj runtime.Object) (*ObjectReference, error) {
if obj == nil {
return nil, ErrNilObject
}
if ref, ok := obj.(*ObjectReference); ok {
// Don't make a reference to a reference.
return ref, nil
}
meta, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
// if the object referenced is actually persisted, we can just get kind from meta
// if we are building an object reference to something not yet persisted, we should fallback to scheme
kind := meta.Kind()
if kind == "" {
_, kind, err = Scheme.ObjectVersionAndKind(obj)
if err != nil {
return nil, err
}
}
// if the object referenced is actually persisted, we can also get version from meta
version := meta.APIVersion()
if version == "" {
selfLink := meta.SelfLink()
if selfLink == "" {
if ForTesting_ReferencesAllowBlankSelfLinks {
version = "testing"
} else {
return nil, ErrNoSelfLink
}
} else {
selfLinkUrl, err := url.Parse(selfLink)
if err != nil {
return nil, err
}
// example paths: /<prefix>/<version>/*
parts := strings.Split(selfLinkUrl.Path, "/")
if len(parts) < 3 {
return nil, fmt.Errorf("unexpected self link format: '%v'; got version '%v'", selfLink, version)
}
version = parts[2]
}
}
return &ObjectReference{
Kind: kind,
APIVersion: version,
Name: meta.Name(),
Namespace: meta.Namespace(),
UID: meta.UID(),
ResourceVersion: meta.ResourceVersion(),
}, nil
}
// watchHandler watches w and keeps *resourceVersion up to date.
func (r *Reflector) watchHandler(w watch.Interface, resourceVersion *string, exitWatch <-chan time.Time) error {
start := time.Now()
eventCount := 0
loop:
for {
select {
case <-exitWatch:
w.Stop()
return errorResyncRequested
case event, ok := <-w.ResultChan():
if !ok {
break loop
}
if event.Type == watch.Error {
return apierrs.FromObject(event.Object)
}
if e, a := r.expectedType, reflect.TypeOf(event.Object); e != a {
glog.Errorf("expected type %v, but watch event object had type %v", e, a)
continue
}
meta, err := meta.Accessor(event.Object)
if err != nil {
glog.Errorf("unable to understand watch event %#v", event)
continue
}
switch event.Type {
case watch.Added:
r.store.Add(event.Object)
case watch.Modified:
r.store.Update(event.Object)
case watch.Deleted:
// TODO: Will any consumers need access to the "last known
// state", which is passed in event.Object? If so, may need
// to change this.
r.store.Delete(event.Object)
default:
glog.Errorf("unable to understand watch event %#v", event)
}
*resourceVersion = meta.ResourceVersion()
eventCount++
}
}
watchDuration := time.Now().Sub(start)
if watchDuration < 1*time.Second && eventCount == 0 {
glog.V(4).Infof("Unexpected watch close - watch lasted less than a second and no items received")
return errors.New("very short watch")
}
glog.V(4).Infof("Watch close - %v total %v items received", r.expectedType, eventCount)
return nil
}
func (r *Reflector) listAndWatch(stopCh <-chan struct{}) {
var resourceVersion string
resyncCh, cleanup := r.resyncChan()
defer cleanup()
list, err := r.listerWatcher.List()
if err != nil {
glog.Errorf("Failed to list %v: %v", r.expectedType, err)
return
}
meta, err := meta.Accessor(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v", list)
return
}
resourceVersion = meta.ResourceVersion()
items, err := runtime.ExtractList(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v (%v)", list, err)
return
}
if err := r.syncWith(items); err != nil {
glog.Errorf("Unable to sync list result: %v", err)
return
}
r.setLastSyncResourceVersion(resourceVersion)
for {
w, err := r.listerWatcher.Watch(resourceVersion)
if err != nil {
switch err {
case io.EOF:
// watch closed normally
case io.ErrUnexpectedEOF:
glog.V(1).Infof("Watch for %v closed with unexpected EOF: %v", r.expectedType, err)
default:
glog.Errorf("Failed to watch %v: %v", r.expectedType, err)
}
return
}
if err := r.watchHandler(w, &resourceVersion, resyncCh, stopCh); err != nil {
if err != errorResyncRequested {
glog.Errorf("watch of %v ended with: %v", r.expectedType, err)
}
return
}
}
}
func (r *Reflector) listAndWatch() {
var resourceVersion string
list, err := r.listerWatcher.List()
if err != nil {
glog.Errorf("Failed to list %v: %v", r.expectedType, err)
return
}
meta, err := meta.Accessor(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v", list)
return
}
resourceVersion = meta.ResourceVersion()
items, err := runtime.ExtractList(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v (%v)", list, err)
return
}
err = r.syncWith(items)
if err != nil {
glog.Errorf("Unable to sync list result: %v", err)
return
}
for {
w, err := r.listerWatcher.Watch(resourceVersion)
if err != nil {
switch err {
case io.EOF:
// watch closed normally
case io.ErrUnexpectedEOF:
glog.V(1).Infof("Watch for %v closed with unexpected EOF: %v", r.expectedType, err)
default:
glog.Errorf("Failed to watch %v: %v", r.expectedType, err)
}
return
}
if err := r.watchHandler(w, &resourceVersion); err != nil {
glog.Errorf("watch of %v ended with error: %v", r.expectedType, err)
return
}
}
}
// GetReference returns an ObjectReference which refers to the given
// object, or an error if the object doesn't follow the conventions
// that would allow this.
func GetReference(obj runtime.Object) (*ObjectReference, error) {
if obj == nil {
return nil, ErrNilObject
}
if ref, ok := obj.(*ObjectReference); ok {
// Don't make a reference to a reference.
return ref, nil
}
meta, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
_, kind, err := Scheme.ObjectVersionAndKind(obj)
if err != nil {
return nil, err
}
version := ""
parsedSelfLink := versionFromSelfLink.FindStringSubmatch(meta.SelfLink())
if len(parsedSelfLink) < 2 {
if ForTesting_ReferencesAllowBlankSelfLinks {
version = "testing"
} else if meta.SelfLink() == "" {
return nil, ErrNoSelfLink
} else {
return nil, fmt.Errorf("unexpected self link format: '%v'; got version '%v'", meta.SelfLink(), version)
}
} else {
version = parsedSelfLink[1]
}
return &ObjectReference{
Kind: kind,
APIVersion: version,
Name: meta.Name(),
Namespace: meta.Namespace(),
UID: meta.UID(),
ResourceVersion: meta.ResourceVersion(),
}, nil
}
func (r *Reflector) listAndWatch() {
var resourceVersion string
list, err := r.listerWatcher.List()
if err != nil {
glog.Errorf("Failed to list %v: %v", r.expectedType, err)
return
}
meta, err := meta.Accessor(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v", list)
return
}
resourceVersion = meta.ResourceVersion()
items, err := runtime.ExtractList(list)
if err != nil {
glog.Errorf("Unable to understand list result %#v (%v)", list, err)
return
}
err = r.syncWith(items)
if err != nil {
glog.Errorf("Unable to sync list result: %v", err)
return
}
for {
w, err := r.listerWatcher.Watch(resourceVersion)
if err != nil {
glog.Errorf("failed to watch %v: %v", r.expectedType, err)
return
}
if err := r.watchHandler(w, &resourceVersion); err != nil {
glog.Errorf("watch of %v ended with error: %v", r.expectedType, err)
return
}
}
}
func executeAPIRequest(ctx api.Context, method string, c *client.Client) bool {
storage, path, hasSuffix := storagePathFromArg(flag.Arg(1))
validStorage := checkStorage(storage)
verb := ""
setBody := false
var version string
printer := getPrinter()
switch method {
case "get":
verb = "GET"
if !validStorage || !hasSuffix {
glog.Fatalf("usage: kubecfg [OPTIONS] %s <%s>[/<id>]", method, prettyWireStorage())
}
case "list":
verb = "GET"
if !validStorage || hasSuffix {
glog.Fatalf("usage: kubecfg [OPTIONS] %s <%s>", method, prettyWireStorage())
}
case "delete":
verb = "DELETE"
if !validStorage || !hasSuffix {
glog.Fatalf("usage: kubecfg [OPTIONS] %s <%s>/<id>", method, prettyWireStorage())
}
case "create":
verb = "POST"
setBody = true
if !validStorage || hasSuffix {
glog.Fatalf("usage: kubecfg [OPTIONS] %s <%s>", method, prettyWireStorage())
}
case "update":
obj, err := c.Verb("GET").Namespace(api.Namespace(ctx)).Suffix(path).Do().Get()
if err != nil {
glog.Fatalf("error obtaining resource version for update: %v", err)
}
meta, err := meta.Accessor(obj)
if err != nil {
glog.Fatalf("error finding json base for update: %v", err)
}
version = meta.ResourceVersion()
verb = "PUT"
setBody = true
if !validStorage || !hasSuffix {
glog.Fatalf("usage: kubecfg [OPTIONS] %s <%s>/<id>", method, prettyWireStorage())
}
case "print":
data := readConfig(storage, c)
obj, err := latest.Codec.Decode(data)
if err != nil {
glog.Fatalf("error setting resource version: %v", err)
}
printer.PrintObj(obj, os.Stdout)
return true
default:
return false
}
r := c.Verb(verb).Namespace(api.Namespace(ctx)).Suffix(path)
if len(*selector) > 0 {
r.ParseSelectorParam("labels", *selector)
}
if len(*fieldSelector) > 0 {
r.ParseSelectorParam("fields", *fieldSelector)
}
if setBody {
if len(version) > 0 {
data := readConfig(storage, c)
obj, err := latest.Codec.Decode(data)
if err != nil {
glog.Fatalf("error setting resource version: %v", err)
}
jsonBase, err := meta.Accessor(obj)
if err != nil {
glog.Fatalf("error setting resource version: %v", err)
}
jsonBase.SetResourceVersion(version)
data, err = c.RESTClient.Codec.Encode(obj)
if err != nil {
glog.Fatalf("error setting resource version: %v", err)
}
r.Body(data)
} else {
r.Body(readConfig(storage, c))
}
}
result := r.Do()
obj, err := result.Get()
if err != nil {
glog.Fatalf("Got request error: %v\n", err)
return false
}
if err = printer.PrintObj(obj, os.Stdout); err != nil {
body, _ := result.Raw()
glog.Fatalf("Failed to print: %v\nRaw received object:\n%#v\n\nBody received: %v", err, obj, string(body))
}
fmt.Print("\n")
return true
}